Wooden honeycomb material and method for manufacturing the same

Abstract

The core material of the wooden honeycomb material proposed in this invention, namely wood fiber paper, is a natural material with a low environmental impact. Furthermore, both the mechanical properties parallel to the longitudinal direction of the wood fibers and the mechanical properties perpendicular to the longitudinal direction of the wood fibers are quite excellent, and the resulting wooden honeycomb material has the advantages of excellent mechanical properties, lightweight design, low cost, and low environmental impact. [Solution] The present invention proposes a wooden honeycomb material. The wooden honeycomb material comprises a wooden honeycomb material and a first resin that adheres to the surface of the wooden honeycomb material. The wooden honeycomb material comprises a plurality of wood fiber paper and a core material adhesive. The plurality of wood fiber paper are bonded together with the core material adhesive. The plurality of composite wood fiber paper comprises unidirectional wood fiber paper and / or composite wood fiber paper. The composite wood fiber paper comprises unidirectional wood fiber paper and a second resin layer and / or fiber reinforcement layer that adheres to the surface of the unidirectional wood fiber paper.

Description

Cross-reference of related applications

[0001] This application claims priority based on a patent application filed in China on February 6, 2024 (Application No.: 2024101716440, Title: Wood Fiber Reinforced Material, Method for Manufacturing the Same and Applications thereof), and incorporates, for reference, a portion of the disclosure of the earlier application. [Technical Field]

[0002] The present invention relates to the technical field of honeycomb materials, and more particularly to wooden honeycomb materials and methods for manufacturing the same. [Background technology]

[0003] The honeycomb structure, with its regular hexagonal arrangement, is often used to form a sandwich structure when combined with a surface plate. The lattice-like core material possesses excellent specific strength and rigidity, significantly improving the overall structural rigidity even with minimal added weight. Furthermore, the honeycomb structure offers excellent stability, resulting in significant improvements in the overall structure's performance in areas such as seismic resistance, impact resistance, and fatigue resistance.

[0004] Currently, high-performance lattice core materials are primarily aramid paper honeycomb materials, which are used in advanced fields such as rail transport, aerospace, and the military industry. However, because aramid paper is expensive, the cost of aramid paper lattice core materials is also high, limiting their large-scale application in general civilian sectors, including construction, automobiles, and consumer goods. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In view of the above, the present invention aims to provide a wooden honeycomb material and a method for manufacturing the same that combines excellent mechanical properties, lightweight design, low cost, and low environmental impact. [Means for solving the problem]

[0006] The present invention provides a wooden honeycomb material comprising a wooden honeycomb material and a first resin adhering to the surface of the wooden honeycomb material, wherein the wooden honeycomb material comprises a plurality of wood fiber paper and a core material adhesive, and the plurality of wood fiber paper are bonded together with the core material adhesive; The plurality of composite wood fiber papers include unidirectional wood fiber paper and / or composite wood fiber paper, and the composite wood fiber paper includes unidirectional wood fiber paper and a second resin layer and / or fiber reinforcing layer attached to the surface of the unidirectional wood fiber paper; Density: 29-144 kg / m³ 3 and; The compressive strength is 0.4 to 13.8 MPa.

[0007] Preferably, the wood fiber paper comprises wood fibers and / or bundles of wood fibers; the wood fibers and / or bundles of wood fibers are microscopically arranged or stretched in one direction as a whole.

[0008] Preferably, the tensile strength of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the wood fiber bundle is 6 to 30 kN / m; and / or The tensile strength of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.3 to 4 kN / m; and / or The elastic modulus of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 8 to 80 GPa; and / or The elastic modulus of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.4 to 3 GPa.

[0009] Preferably, the unidirectional wood fiber paper is formed by the shrinkage of a unidirectional wood grain, from which partial material has been removed, along at least one direction. The aforementioned partial material comprises woody material and semi-fibery material; The contraction according to the decomposition of forces includes lateral contraction and thickness contraction.

[0010] Preferably, the unidirectional wood grain from which the partial material has been removed shrinks along at least two directions; The aforementioned shrinkage includes lateral shrinkage and thickness shrinkage; The directions of the contraction forces of the lateral contraction and the thickness contraction intersect; The contraction force of the lateral shrinkage is a force in the horizontal direction of the unidirectional wood grain and a force that intersects in plane with the extension direction of the wood fibers and / or bundles of wood fibers; and / or the contraction force of the thickness shrinkage is a force in the vertical direction of the unidirectional wood grain; The force in the horizontal direction and the force in the vertical direction are forces that are initially applied independently, and / or forces that are formed after the combination or decomposition of forces.

[0011] Preferably, the thickness of the unidirectional wood fiber paper is 0.2 mm or less; and / or The surface density of the aforementioned unidirectional wood fiber paper is 20-200 g / m². 2 is; and / or The tensile strength of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 150 to 1000 MPa.

[0012] Preferably, under a surface pressure of 0.005 MPa or less, the apparent thickness of the unidirectional wood fiber paper does not exceed four times the average thickness of the unidirectional wood fiber paper; and / or The weight reduction rate of the unidirectional wood grain after removing a portion of the material is 10% to 60%; and / or The lateral shrinkage rate is 2% to 40%, and the thickness shrinkage rate is 20% to 90%.

[0013] Preferably, the weight of the second resin layer is 0% to 30% of the weight of the composite wood fiber paper; and the weight of the fiber reinforcement layer is 0% to 10% of the weight of the composite wood fiber paper. Preferably, the second resin layer is a thermosetting resin and / or a thermoplastic resin; and / or The surface density of the fiber-reinforced layer is 1 to 20 g / m² 2 That is the case.

[0014] Preferably, the thermosetting resin is selected from one or more of epoxy resins, unsaturated polyester resins, polyphthalicone resins, phenolic resins, melamine resins, and crosslinkable polyurethane resins; and / or The thermoplastic resin is selected from one or more of polyamite, polylactic acid, polyurethane, ethylene-acetic acid copolymer, ethylene-acrylic acid copolymer, and copolyester; and / or The fiber-reinforced layer is a low-density fiber surface felt, and the low-density fiber surface felt is selected from one or more of carbon fiber surface felt, crow fiber surface felt, and aramid fiber surface felt.

[0015] Preferably, the surface density of the composite wood fiber paper is 3 to 50 g / m² higher than the surface density of the unidirectional wood fiber paper. 2 It goes up. Preferably, the weight of the wood fiber paper is 30% to 84% of the weight of the wood honeycomb material; and / or The weight of the first resin is 15% to 69% of the weight of the wooden honeycomb material; and / or The weight of the core material adhesive is 1% to 30% of the weight of the wooden honeycomb material.

[0016] The present invention further provides a method for manufacturing wooden honeycomb material. S1) Multiple sheets of wood fiber paper coated with core material adhesive are stacked alternately, heat-compressed and hardened to obtain a honeycomb layered mass; S2) The honeycomb layered mass is stretched to obtain a wooden honeycomb material; S3) The process includes transferring the first resin onto a wooden honeycomb material, curing and shaping it to obtain the wooden honeycomb material; Multiple sheets of wood fiber paper include unidirectional wood fiber paper and / or composite wood fiber paper; the composite wood fiber paper includes unidirectional wood fiber paper and a second resin layer and / or fiber reinforcing layer attached to the surface of the unidirectional wood fiber paper; The density of the aforementioned wooden honeycomb material is 29-144 kg / m³ 3 and; The compressive strength of the aforementioned wooden honeycomb material is 0.4 to 13.8 MPa.

[0017] Preferably, the method for manufacturing the unidirectional wood fiber paper is: A1) Chemically modify the unidirectional wood grain to obtain a unidirectional wood grain from which partial substances have been removed; A2) The unidirectional wood grain from which the partial material has been removed shrinks along at least one direction, thereby obtaining unidirectional wood fiber paper. The contraction according to the decomposition of forces includes lateral contraction and thickness contraction.

[0018] Preferably, the thickness of the unidirectional wood grain is 0.05 to 0.6 mm; and / or The chemical modification in A1) is carried out within a sealed, high-pressure system; The target temperature for the chemical modification is 100 to 150°C, and the target surface pressure for the chemical modification is 0.07 to 1.9 MPa; The duration of the chemical modification under the action of the target temperature / target surface pressure is 1 to 12 hours; or The chemical modification is performed under normal pressure, the duration of the chemical modification is 24-72 hours under the action of the target temperature / target surface pressure, and the temperature of the chemical modification is the boiling point of water under normal pressure; and / or A1) The chemical modifier in the aforementioned chemical modification includes an alkaline substance, a sulfonating agent, and water; The pH value of the aforementioned chemical modifier is 12 to 14; The concentration of the alkaline substance in the aforementioned chemical modifier is 0.01 to 5 kg / L; The alkaline substance is selected from one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, and potassium bicarbonate; The concentration of the sulfonating agent is 0.01 to 5 kg / L; The sulfonating agent in the chemical modifier is selected from one or more of sulfites, chlorsulfonic acid, hydroxymethylsulfonate, sulfuryl chloride, and sulfamic acid; and / or The ratio of the unidirectional wood grain to the chemical modifier is 4.6 to 184 cm. 3 It is 1 liter.

[0019] Preferably, the shrinkage treatment includes a lateral shrinkage treatment and a thickness shrinkage treatment; the force of the lateral shrinkage treatment intersects with the force of the thickness shrinkage treatment.

[0020] Preferably, the lateral shrinkage treatment is shrinkage due to external mechanical force applied laterally and / or spontaneous shrinkage due to dehydration; The external mechanical force applied laterally intersects in plane with the extension direction of the wood fibers and / or fiber bundles in a unidirectional wood grain, with the partial material removed.

[0021] Preferably, the external mechanical force applied laterally is the pressure applied to the surface of a unidirectional wood grain from which a portion of the material has been removed, while the film material undergoing lateral contraction is attached; and / or Negative pressure applied to a unidirectional wood surface from which partial material has been removed; and / or The pressure applied when rolling over a unidirectional wood surface from which some material has been removed; and / or This is pressure applied laterally to a unidirectional wood grain from which some material has been removed. Preferably, the surface pressure of the external mechanical force applied in the lateral direction is 0.001 to 1.5 MPa; and / or The temperature of the lateral shrinkage treatment is 15°C to 150°C; and / or The duration of the aforementioned lateral contraction process is 1 s to 4 min; and / or The intensity of the negative pressure is 1 atmosphere or less.

[0022] Preferably, the thickness reduction treatment involves applying mechanical pressure in the thickness direction; The surface pressure of the mechanical pressure applied in the thickness direction is 0.01 to 80 MPa; and / or The time for the aforementioned thickness reduction treatment is 0.1 to 4 minutes; and / or The temperature for the thickness shrinkage treatment is 15 to 150°C.

[0023] Preferably, the thickness reduction is performed in a single-layer or stacked state; the number of stacked layers is 2 to 20 layers; The surface pressure during the thickness shrinkage treatment in the aforementioned stacked state is 0.1 to 60 MPa.

[0024] Preferably, the lateral shrinkage rate is 2% to 40%; The shrinkage rate of the aforementioned thickness reduction is 20% to 90%.

[0025] Preferably, the thickness reduction treatment includes a hot-pressure treatment under negative pressure conditions; The surface pressure of the aforementioned hot-pressure treatment is 0.1 to 60 MPa; and / or The temperature of the aforementioned heat press treatment is 50°C to 150°C; and / or The duration of the aforementioned heat and pressure treatment is 0.5 to 20 minutes.

[0026] Preferably, a planarization process is performed after the shrinkage process; The planarization process involves performing planar thermal compression in a negative pressure extraction environment.

[0027] Preferably, when performing the planarization process, an exhaust passage is provided on the double contact surface or single contact surface of the unidirectional wood fiber paper.

[0028] Preferably, the surface pressure of the planar thermal compression is 0.01 to 2 MPa; and / or The time for the planarization process is 0.1 to 4 minutes; and / or The temperature of the planarization process is 40°C to 150°C.

[0029] Preferably, the planarization process is selected from one or more of the vacuum forming process and the negative pressure thermal compression process; and / or The moisture content of the aforementioned unidirectional wood fiber paper is less than 10%.

[0030] Preferably, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer adhering to the surface of the unidirectional wood fiber paper; The method for producing the composite wood fiber paper includes transferring a diluted second resin raw material to the surface of unidirectional wood fiber paper, allowing it to harden, and then obtaining the composite wood fiber paper; The second resin raw material is selected from one or more of the monomer of the second resin, the prepolymer of the second resin, and the second resin.

[0031] Preferably, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer and a fiber reinforcing layer attached to the surface of the unidirectional wood fiber paper; The method for producing the composite wood fiber paper includes transferring a diluted second resin raw material to the surface of unidirectional wood fiber paper, then coating it with a fiber-reinforced layer, curing it, and then obtaining the composite wood fiber paper; The second resin raw material is selected from one or more of the monomer of the second resin, the prepolymer of the second resin, and the second resin.

[0032] Preferably, in S3), the first resin is transferred onto the wooden honeycomb material multiple times, and the material is cured and shaped multiple times to obtain the wooden honeycomb material; the process of curing and shaping multiple times is performed between the two transfers, and the last step performed is curing and shaping; the transfer method is selected from one or more of spraying, spraying, and coating.

[0033] Preferably, the first resin is introduced into the empty lattice of the wooden honeycomb material by means of spraying, spraying, or coating, then the wooden honeycomb material is stretched and pressed, and the first resin is uniformly applied to the wooden honeycomb material, thereby performing the step of transferring the resin onto the wooden honeycomb material in S3).

[0034] The present invention further provides a composite wood fiber paper comprising a unidirectional wood fiber paper and a second resin layer and / or fiber-reinforced layer attached to at least one surface of the unidirectional wood fiber paper.

[0035] Preferably, the unidirectional wood fiber paper is formed by the shrinkage of a unidirectional wood grain, from which partial material has been removed, along at least one direction. The aforementioned partial material comprises woody material and semi-fibery material; The contraction according to the decomposition of forces includes lateral contraction and thickness contraction; The aforementioned unidirectional wood fiber paper includes wood fibers and / or bundles of wood fibers; The wood fibers and / or bundles of wood fibers are arranged or stretched microscopically in one direction as a whole; The tensile strength of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 6 to 30 kN / m; and / or The tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.7 to 4 kN / m; and / or The elastic modulus of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 8 to 80 GPa; and / or The elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.8 to 3 GPa.

[0036] Preferably, the weight of the second resin layer is 0% to 30% of the weight of the composite wood fiber paper; the weight of the fiber reinforcement layer is 0% to 10% of the weight of the composite wood fiber paper, and both are not zero at the same time.

[0037] Preferably, the second resin layer comprises a thermosetting resin and / or a thermoplastic resin; The thermosetting resin is selected from one or more of epoxy resins, unsaturated polyester resins, polyphthalicone resins, phenolic resins, melamine resins, and crosslinkable polyurethane resins; the thermoplastic resin is selected from one or more of polyamites, polylactic acid, polyurethanes, ethylene-phenyl acetate copolymers, ethylene-acrylic acid ester copolymers, and copolyesters; The fiber-reinforced layer is a low-density fiber surface felt; The low-density fiber surface felt is selected from one or more of carbon fiber surface felt, crow fiber surface felt, and aramid fiber surface felt.

[0038] Preferably, the surface density of the composite wood fiber paper is 3 to 50 g / m² higher than the surface density of the unidirectional wood fiber paper. 2 It goes up.

[0039] The present invention further provides applications of the wooden honeycomb material or the composite wood fiber paper in one or more of the following: building materials, furniture materials, sports equipment, support members, vehicles, and aircraft. [Effects of the Invention]

[0040] This invention proposes a wooden honeycomb material. The wooden honeycomb material comprises a wooden honeycomb material and a first resin adhering to the surface of the wooden honeycomb material. The wooden honeycomb material comprises a plurality of wood fiber paper and a core material adhesive. The plurality of wood fiber paper are bonded together with the core material adhesive. The plurality of composite wood fiber paper comprises unidirectional wood fiber paper and / or composite wood fiber paper. The composite wood fiber paper comprises unidirectional wood fiber paper and a second resin layer and / or fiber reinforcement layer adhering to the surface of the unidirectional wood fiber paper. The core material of the wooden honeycomb material proposed in this invention, i.e., wood fiber paper, is a natural material with a low environmental impact. Furthermore, both the mechanical properties parallel to the longitudinal direction of the wood fibers and the mechanical properties perpendicular to the longitudinal direction of the wood fibers are quite excellent, and the resulting wooden honeycomb material has the advantages of excellent mechanical properties, lightweight, low cost, and low environmental impact. [Brief explanation of the drawing]

[0041] Figure 1 is a schematic diagram of the manufacturing process for the wooden honeycomb material proposed in the present invention. Figure 2 shows sample diagrams of different stages in the manufacturing process of the wooden honeycomb material proposed in the present invention. Figure 3 is a schematic diagram of the raw material frame structure of the upright chemical reaction vessel proposed in the present invention. Figure 4 is a schematic diagram showing the unidirectional wood grain proposed in the present invention placed on an upright chemical reaction vessel. Figure 5 is a schematic diagram of the raw material frame structure of the horizontal chemical reaction vessel proposed in the present invention. Figure 6 is a schematic diagram showing the unidirectional wood grain proposed in the present invention placed on a horizontal chemical reaction vessel. Figure 7 is a schematic diagram of collapse and shrinkage, showing the state in which the cavities of the unidirectional wood fiber paper proposed in the present invention spontaneously shrink laterally. Figure 8 is a schematic diagram of the continuous hot pressure treatment of the hot extrusion roll proposed in the present invention. Figure 9 is a schematic diagram of the continuous hot pressure treatment of the continuous flatbed press proposed in the present invention. Figure 10 is a schematic diagram of the continuous hot pressure treatment of the belt press proposed in the present invention. Figure 11 is a schematic diagram showing the state of joining together unidirectional wood fiber paper. Figure 12 is a photograph showing actual samples of different composite wood fiber papers. Figure 13 is a schematic diagram of the structure of composite wood fiber paper. Figure 14 is a schematic diagram showing the state of joining unidirectional wood fiber paper using a coating layer. Figure 15 is a schematic diagram of two application directions when applying the core material adhesive to composite wood fiber paper. Figure 16 is a schematic diagram showing the location where the core material adhesive proposed in the present invention is applied to wood fiber paper. Figure 17 is a schematic diagram of the manufacturing process of the wooden honeycomb material proposed in the present invention. Figure 18 is a schematic diagram of the structure of the wooden honeycomb material proposed in the present invention. Figure 19 is a top view of the wooden honeycomb material proposed in the present invention. Figure 20 is a top view of the wooden honeycomb material proposed in the present invention. Figure 21 is a schematic diagram of the structure of the wooden honeycomb member proposed in the present invention. Figure 22 is a photograph of the unidirectional wood grain in Example 1 of the present invention, after removing a portion of the material that was in a wet state. Figure 23 is a schematic diagram showing the state in which a unidirectional wood grain, from which a portion of the material has been partially removed, spontaneously shrinks laterally in Example 1 of the present invention. Figure 24 is a test curve diagram of tensile stress-deformation along the longitudinal direction of the fibers of wood fiber paper in Embodiment 1 of the present invention. Figure 25 is a photograph showing an actual piece of wood surface that shrinks only in the thickness direction after chemical treatment in Comparative Example 1 of the present invention. [Modes for carrying out the invention]

[0042] Next, the technical means in embodiments of the present invention will be clearly and completely described by combining examples of the present invention, although it is clear that the described examples represent only a part of the embodiments of the present invention and not all of them. Any other embodiments obtained based on embodiments of the present invention without the creative effort of a person skilled in the art are all included within the scope of protection of the present invention.

[0043] The wooden honeycomb material proposed in this invention comprises a wooden honeycomb material and a first resin that adheres to the surface of the wooden honeycomb material. The wooden honeycomb material comprises multiple sheets of wood fiber paper and a core material adhesive. The multiple sheets of wood fiber paper are bonded together with the core material adhesive. The multiple sheets of composite wood fiber paper comprises unidirectional wood fiber paper and / or composite wood fiber paper. The composite wood fiber paper comprises unidirectional wood fiber paper and a second resin layer and / or fiber reinforcement layer attached to the surface of the unidirectional wood fiber paper.

[0044] In the present invention, the wood fiber paper includes wood fibers and / or bundles of wood fibers. The wood fibers and / or bundles of wood fibers are microscopically arranged or stretched in one direction. Specifically, 70% or more of the wood fibers and / or bundles of wood fibers are microscopically arranged or stretched in one direction. More specifically, 80% or more of the wood fibers and / or bundles of wood fibers are microscopically arranged or stretched in one direction.

[0045] In this invention, the tensile strength of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 6 to 30 kN / m. In the free choice, the tensile strength of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 6kN / m, 8kN / m, 10kN / m, 12kN / m, 14kN / m, 16kN / m, 18kN / m, 20kN / m, 22kN / m, 24kN / m, 26kN / m, 28kN / m, 30kN / m, or within the range of any two of the above values.

[0046] In the present invention, the tensile strength of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.3 to 4 kN / m. In the free choice, the tensile strength of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.3 kN / m, 0.5 kN / m, 0.8 kN / m, 1.0 kN / m, 1.2 kN / m, 1.5 kN / m, 1.8 kN / m, 2.0 kN / m, 2.2 kN / m, 2.5 kN / m, 2.8 kN / m, 3.0 kN / m, 3.2 kN / m, 3.5 kN / m, 3.8 kN / m, 4 kN / m, or within the range of any two of the above values.

[0047] In this invention, the elastic modulus of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 8 to 80 GPa. In the free choice, the elastic modulus of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 8 GPa, 10 GPa, 15 GPa, 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, 45 GPa, 50 GPa, 55 GPa, 60 GPa, 65 GPa, 70 GPa, 75 GPa, 80 GPa, or within the range of any two of the above values.

[0048] In this invention, the elastic modulus of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.4 to 3 GPa. In the free choice, the elastic modulus of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.4 GPa, 0.6 GPa, 0.8 GPa, 1.0 GPa, 1.2 GPa, 1.5 GPa, 1.8 GPa, 2.0 GPa, 2.2 GPa, 2.4 GPa, 2.6 GPa, 2.8 GPa, 3 GPa, or within the range of any two of the above values.

[0049] In this invention, the unidirectional wood fiber paper is formed by the shrinkage of a unidirectional wood grain, from which a partial substance has been removed, along at least one direction. This partial substance comprises woody material and hemicrystalline material.

[0050] In this invention, the thickness of the unidirectional wood fiber paper is 0.2 mm or less.

[0051] In the present invention, the density of the single-direction wood fiber paper is 0.8 to 1.5 g / cm 3 In the case of free selection, the density of the single-direction wood fiber paper is 0.8 g / cm 3 , 0.9 g / cm 3 , 1.0 g / cm 3 , 1.1 g / cm 3 , 1.2 g / cm 3 , 1.3 g / cm 3 , 1.4 g / cm 3 , 1.5 g / cm 3 or in the range between any two of the above values.

[0052] In the present invention, the basis weight of the single-direction wood fiber paper is 20 to 200 g / m 2 In the case of free selection, the basis weight of the single-direction wood fiber paper is 20 g / m 2 , 30 g / m 2 , 50 g / m 2 , 70 g / m 2 , 80 g / m 2 , 100 g / m 2 , 120 g / m 2 , 140 g / m 2 , 160 g / m 2 , 180 g / m 2 , 200 g / m 2 or in the range between any two of the above values.

[0053] In the present invention, the tensile strength of the single-direction wood fiber paper in the direction parallel to the longitudinal direction of the wood fiber and / or wood fiber bundle is 150 to 1000 MPa. In the case of free selection, the tensile strength of the single-direction wood fiber paper in the direction parallel to the longitudinal direction of the wood fiber and / or wood fiber bundle is 150 MPa, 250 MPa, 350 MPa, 450 MPa, 500 MPa, 600 MPa, 700 MPa, 800 MPa, 900 MPa, 1000 MPa or in the range between any two of the above values. In the present invention, the yank coefficient of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 20 to 70 GPa, and more preferably 25 to 70 GPa. Freely selected, the yank coefficient of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, 45 GPa, 50 GPa, 55 GPa, 60 GPa, 65 GPa, 70 GPa, or within the range of any two of the above values.

[0054] In the present invention, the tensile strength of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 6 to 30 kN / m, and more preferably 11 to 25 kN / m. Freely selected, the tensile strength of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 11 kN / m, 12 kN / m, 13 kN / m, 14 kN / m, 15 kN / m, 16 kN / m, 17 kN / m, 18 kN / m, 19 kN / m, 20 kN / m, 21 kN / m, 22 kN / m, 23 kN / m, 24 kN / m, 25 kN / m, or within the range of any two of the above values.

[0055] In the present invention, the elastic modulus of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 8 to 80 GPa. In the free choice, the elastic modulus of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 8 GPa, 10 GPa, 15 GPa, 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, 45 GPa, 50 GPa, 55 GPa, 60 GPa, 65 GPa, 70 GPa, 75 GPa, 80 GPa, or within the range of any two of the above values.

[0056] In the present invention, the tensile strength of the unidirectional wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 0.3 to 4 kN / m, and more preferably 0.3 to 1.5 kN / m. Freely selected, the tensile strength of the unidirectional wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.3 kN / m, 0.4 kN / m, 0.5 kN / m, 0.6 kN / m, 0.7 kN / m, 0.8 kN / m, 0.9 kN / m, 1.0 kN / m, 1.1 kN / m, 1.2 kN / m, 1.3 kN / m, 1.4 kN / m, 1.5 kN / m, or within the range of any two of the above values.

[0057] In the present invention, the elastic modulus of the unidirectional wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 0.4 to 3 GPa, and more preferably 0.4 to 2 GPa. Freely selected, the elastic modulus of the unidirectional wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.4 GPa, 0.6 GPa, 0.8 GPa, 1.2 GPa, 1.4 GPa, 1.6 GPa, 1.8 GPa, 2 GPa, or within the range of any two of the above values.

[0058] The unidirectional wood fiber paper proposed in this invention has high flatness, and specifically, under a surface pressure of 0.005 MPa or less, the apparent thickness of the unidirectional wood fiber paper does not exceed four times the average thickness of the unidirectional wood fiber paper.

[0059] More specifically, preferably, under the action of a surface pressure of 0.005 MPa, the apparent thickness of the unidirectional wood fiber paper does not exceed three times the average thickness of the unidirectional wood fiber paper.

[0060] Furthermore, those skilled in the art will understand that apparent thickness is related to pressure, and that the greater the pressure, the smaller the apparent thickness becomes, and the smaller the ratio between apparent thickness and average thickness. Therefore, the description of flatness has the same effect as the description above.

[0061] In one specific embodiment proposed in the present invention, the method for testing flatness is as follows: When a unidirectional fiberboard is placed between two planar objects and pressure is applied to the planes, a small surface pressure is applied to the unidirectional fiberboard. The flat fiberboard tends to conform to the pressured plane, and the difference between the highest and lowest points of the pressure-receiving unidirectional fiberboard is the apparent thickness of the unidirectional fiberboard. The average thickness of unidirectional wood fiber paper is the average of the thicknesses of unidirectional wood fiber paper measured at different points using a micrometer. In this invention, the unidirectional wood fiber paper is formed by chemically modifying the unidirectional wood grain to remove some substances and undergoing bidirectional shrinkage. This invention uses naturally occurring unidirectional wood to produce unidirectional fiber paper, in which the fibers of the unidirectional wood grow along the longitudinal direction of the tree trunk, and the fibers become tightly aligned and parallel in a straight line. In this invention, the thickness of the unidirectional wood grain is 0.6 mm or less, and moreover, 0.05 to 0.6 mm. In the free selection, the thickness of the unidirectional wood grain is 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, or within the range of any two of the above values. As a specific example in the embodiments proposed in this invention, a unidirectional wood grain with a thickness of 0.28 mm is given, and the surface density of the unidirectional wood grain is preferably 20 to 200 g / m². 2 And more preferably 70-200 g / m² 2 In the case of free selection, the surface density of the unidirectional wood grain is 20 g / m². 2 50g / m 2 70g / m 2 80g / m 2 90g / m 2 100g / m 2 110g / m² 2 120g / m 2 130g / m 2 150g / m 2 180g / m² 2 200g / m 2 Or it is a range between any two of the above values. Generally, the thicker the unidirectional grain, the higher the surface density.

[0062] In this invention, the weight reduction rate of the unidirectional wood grain obtained by removing a portion of the material is preferably 10% to 60%. In the free choice, the weight reduction rate of the unidirectional wood grain obtained by removing a portion of the material is 10%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, or within the range of any two of the above values. The portion of the material includes woody material and semi-fibrous material.

[0063] In the present invention, the contraction in at least one direction after force decomposition includes lateral contraction and thickness contraction.

[0064] In one specific embodiment proposed in the present invention, the contraction in at least one direction is contraction in at least two directions. The contraction includes transverse contraction and thickness contraction. The directions of the contraction forces of the transverse contraction and thickness contraction intersect.

[0065] In one specific embodiment proposed in the present invention, the shrinkage is bidirectional. This bidirectional shrinkage includes transverse shrinkage and thickness shrinkage, i.e., the unidirectional wood grain, from which a portion of the material has been removed, forms unidirectional wood fiber paper through bidirectional shrinkage.

[0066] The lateral shrinkage rate is preferably 2% to 40%. In the case of free selection, the lateral shrinkage rate is 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or within the range of any two of the above values. Since an increasing lateral shrinkage rate tends to increase the tensile strength and coefficient of the unidirectional wood fiber paper in the direction perpendicular to the longitudinal direction of the fibers, selection can be made according to demand.

[0067] The shrinkage rate of the thickness shrinkage is preferably 20% to 90%, and more preferably 20% to 86%. In the case of free selection, the shrinkage rate of the thickness shrinkage is 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 86%, 90%, or within the range of any two of the above values. The higher the thickness shrinkage rate, the thinner the unidirectional wood fiber paper becomes. The tensile strength and tensile modulus of unidirectional wood fiber paper in the longitudinal direction of the fibers tend to increase, and can therefore be selected according to demand.

[0068] In this invention, the directions of the shrinkage forces for lateral shrinkage and thickness shrinkage intersect. The angle of this intersection is preferably 60° to 90°.

[0069] In one specific embodiment proposed in the present invention, the unidirectional wood grain, with partial material removed, contains wood fibers and / or fiber bundles. The wood fibers and / or fiber bundles are microscopically aligned or stretched along one direction, and forces in the stretching direction of the wood fibers and / or fiber bundles intersect in the plane. The in-plane intersections are also macroscopically perpendicular to the longitudinal direction of the fibers. The contraction force for the transverse shrinkage is a force in the horizontal direction of the unidirectional wood grain, and / or the contraction force for the thickness shrinkage is a force in the vertical direction of the unidirectional wood grain. The horizontal force and the vertical force are initially applied forces, and / or forces formed after the combination or decomposition of forces.

[0070] The thickness and density of the unidirectional wood fiber paper obtained through shrinkage in at least two directions will both vary. The thickness of the unidirectional wood fiber paper is thinner than the thickness of the unidirectional wood grain, preferably 10% to 80% of the thickness of the unidirectional wood grain. Freely selected, the thickness of the unidirectional wood fiber paper is within the range of 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80% of the thickness of the unidirectional wood grain, or any two of the above values.

[0071] In this invention, the raw material for the unidirectional wood fiber paper is natural wood, and is 100% natural material.

[0072] In this invention, the size of the unidirectional wood fiber paper can theoretically reach infinite width and length through joining. Specifically, the length of a single, unjoined sheet of unidirectional wood fiber paper is preferably 0.1 to 5 m.

[0073] In this invention, the moisture content of the unidirectional wood fiber paper is preferably less than 10 wt%. The unidirectional wood fiber paper does not wrinkle when left at room temperature.

[0074] In the present invention, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer and / or fiber-reinforced layer attached to at least one surface of the unidirectional wood fiber paper. The weight of the second resin layer is 0% to 30% of the weight of the composite wood fiber paper. Freely selected, the weight of the second resin layer is in the range of 0%, 5%, 10%, 15%, 20%, 25%, 30% of the weight of the composite wood fiber paper, or any two of the above values. The weight of the fiber-reinforced layer is 0% to 10% of the weight of the composite wood fiber paper. In the free choice, the weight of the fiber-reinforced layer is 0%, 2%, 4%, 6%, 8%, 10%, or any two of the above values. Preferably, the second resin layer and the fiber-reinforced layer are made of materials with low surface density so as not to significantly increase the overall density. The surface density of this composite wood fiber paper is 3 to 50 g / m² higher than that of unidirectional wood fiber paper. 2 It goes up. In the case of free selection, the surface density of the composite wood fiber paper is 3 g / m² higher than that of unidirectional wood fiber paper. 2 5g / m 2 10g / m 2 15g / m 2 20g / m 2 25g / m 2 30g / m 2 35g / m 2 40g / m 2 45g / m 2 50g / m 2Or the value increases to a number between any two of the above values. Specifically, the surface density of the composite wood fiber paper is preferably 60 to 120 g / m². 2 In the free choice, the surface density of the composite wood fiber paper is 60 g / m². 2 70g / m 2 80g / m 2 90g / m 2 100g / m 2 110g / m² 2 120g / m 2 Or it is a range between any two of the above values.

[0075] Compared to unidirectional wood fiber paper, composite wood fiber paper with a second resin layer and / or fiber reinforcement layer is primarily characterized by increased tensile strength in the direction perpendicular to the wood fibers and / or wood fiber bundles, while also maintaining extremely low density and achieving overall dimensional changes.

[0076] Specifically, the tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is 5% to 100% higher than that of unidirectional wood fiber paper, and can be freely selected to increase by 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, or any two of the above values.

[0077] More specifically, the tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is preferably 0.7 to 4 kN / m. Freely selected, the tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is specifically within the range of 0.7 kN / m, 0.8 kN / m, 1.2 kN / m, 1.4 kN / m, 1.6 kN / m, 1.8 kN / m, 2.0 kN / m, 2.2 kN / m, 2.4 kN / m, 2.6 kN / m, 2.8 kN / m, 3.0 kN / m, 3.5 kN / m, 4.0 kN / m, or any two of the above values.

[0078] Specifically, the elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is 5% to 100% higher than the tensile strength of unidirectional wood fiber paper, and can be freely selected to increase by 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 100%, or any two of the above values.

[0079] More specifically, the elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is preferably 0.8 to 3 GPa. Freely selected, the elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundles is in the range of 0.8 GPa, 1 GPa, 1.2 GPa, 1.4 GPa, 1.6 GPa, 1.8 GPa, 2 GPa, 2.2 GPa, 2.4 GPa, 2.6 GPa, 2.8 GPa, 3 GPa, or any two of the above values. The thickness of the composite wood fiber paper is preferably 0.07 to 0.21 mm.

[0080] In the present invention, the tensile strength of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is preferably 6 to 30 kN / m, and more preferably 11 to 25 kN / m. Freely selected, the tensile strength of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundle is 11 kN / m, 12 kN / m, 13 kN / m, 14 kN / m, 15 kN / m, 16 kN / m, 17 kN / m, 18 kN / m, 19 kN / m, 20 kN / m, 21 kN / m, 22 kN / m, 23 kN / m, 24 kN / m, 25 kN / m, or within the range of any two of the above values.

[0081] In the present invention, the elastic modulus of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundles is preferably 8 to 80 GPa. In the free choice, the elastic modulus of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or wood fiber bundles is 8 GPa, 10 GPa, 15 GPa, 20 GPa, 25 GPa, 30 GPa, 35 GPa, 40 GPa, 45 GPa, 50 GPa, 55 GPa, 60 GPa, 65 GPa, 70 GPa, 75 GPa, 80 GPa, or within the range of any two of the above values.

[0082] In one specific embodiment proposed in the present invention, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer attached to at least one surface of the unidirectional wood fiber paper. More specifically, the second resin layer is attached to both of the two surfaces of the unidirectional wood fiber paper. The weight of the second resin layer is 0.1% to 30% of the weight of the composite wood fiber paper. The surface density of the composite wood fiber paper is 3 to 40 g / m² higher than the surface density of the unidirectional wood fiber paper. 2 It goes up.

[0083] In another specific embodiment proposed in the present invention, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer and a fiber reinforcement layer attached to at least one surface of the unidirectional wood fiber paper. The fiber reinforcement layer is located on one side of the second resin layer, away from the unidirectional wood fiber paper. More specifically, the second resin layer and the fiber reinforcement layer are sequentially installed on two surfaces of the unidirectional wood fiber paper. The weight of the second resin layer is 0.1% to 30% of the weight of the composite wood fiber paper. The weight of the fiber reinforcement layer is 0.1% to 10% of the weight of the composite wood fiber paper. The surface density of the composite wood fiber paper is 10 to 50 g / m² higher than the surface density of the unidirectional wood fiber paper. 2 It goes up.

[0084] In the present invention, the second resin layer preferably comprises a thermosetting resin and / or a thermoplastic resin. Preferably, the thermosetting resin is selected from one or more of epoxy resins, unsaturated polyester resins, polyphthalicone resins, phenolic resins, melamine resins, and crosslinkable polyurethane resins, and the thermoplastic resin is selected from one or more of polyamites, polylactic acid, polyurethanes, ethylene-phenyl acetate copolymers, ethylene-acrylic acid ester copolymers, and copolyesters.

[0085] In this invention, the surface density of the fiber-reinforced layer is 1 to 20 g / m². 2 In the case of free selection, the surface density of the fiber-reinforced layer is 1 g / m². 2 , 2g / m 2 5g / m 2 , 8g / m 2 10g / m 2 12g / m 2 15g / m 2 16g / m 2 18g / m 2 19g / m 2 20g / m 2 Or it is a range between any two of the above values.

[0086] In the present invention, the fiber-reinforced layer is preferably a low-density fiber surface felt. Preferably, the low-density fiber surface felt is selected from one or more of carbon fiber surface felt, crow fiber surface felt, and aramid fiber surface felt.

[0087] The wooden honeycomb material proposed in this invention is composed of multiple sheets of wood fiber paper, a primary resin, and a core material adhesive. Multiple sheets of wood fiber paper and a core material adhesive form the wooden honeycomb structure. The first resin adheres to the wooden honeycomb material and can also penetrate into the wood fiber paper that makes up the wooden honeycomb material. The weight of the wood fiber paper is preferably 30% to 84% of the weight of the wooden honeycomb material. In the free choice, the weight of the wood fiber paper is preferably 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 84% of the wood honeycomb material, or within the range of any two of the above values. The weight of the first resin is preferably 15% to 69% of the weight of the wooden honeycomb material. In the free choice, the weight of the first resin is preferably 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 69% of the wooden honeycomb material, or within the range of any two of the above values. The weight of the core material adhesive is preferably 1% to 3% of the weight of the wooden honeycomb material. In the free choice, the weight of the core material adhesive is preferably in the range of 1%, 1.5%, 2%, 2.5%, 3% of the wooden honeycomb material, or any two of the above values.

[0088] In the present invention, the first resin is preferably selected from one or more of the following: epoxy resin, phenolic resin, unsaturated polyester resin, furfuryl alcohol resin, etc. In this invention, the density of the wooden honeycomb material is preferably 29 to 144 kg / m³. 3 The compressive strength of the wooden honeycomb material is preferably 0.4 to 13.8 MPa.

[0089] More specifically, the standard density values ​​for wooden honeycomb materials are 29, 32, 40, 48, 56, 64, 72, 80, 96, 128, or 144 kg / m³. 3 That is the case. Wooden honeycomb materials of different densities may have different mechanical properties. 29 kg / m 3 The compressive strength of wooden honeycomb material is 0.4 to 1.0 MPa. 32 kg / m 3 The compressive strength of wooden honeycomb material is 0.4 to 1.1 MPa. 40 kg / m 3 The compressive strength of wooden honeycomb material is 0.6 to 1.3 MPa. 48 kg / m3 The compressive strength of wooden honeycomb material is 0.8 to 1.6 MPa. 56 kg / m 3 The compressive strength of wooden honeycomb material is 0.8 to 2 MPa. 64 kg / m 3 The compressive strength of wooden honeycomb material is 1.2 to 3.3 MPa. 72 kg / m 3 The compressive strength of wooden honeycomb material is 1.5 to 4.5 MPa. 80 kg / m 3 The compressive strength of wooden honeycomb material is 1.8 to 4.8 MPa. 96 kg / m 3 The compressive strength of wooden honeycomb material is 1.8 to 7.2 MPa. 128 kg / m 3 The compressive strength of wooden honeycomb material is 1.8 to 11.5 MPa. 144 kg / m 3 The compressive strength of wooden honeycomb material is 2.2 to 13.8 MPa.

[0090] In the present invention, the wooden honeycomb material has a continuous and regular void lattice structure, preferably, a single void lattice is a hexagonal through-hole or an enlarged square through-hole, and multiple continuous void lattices combine to form the wooden honeycomb material.

[0091] In the present invention, preferably, the side length of the empty lattice of the wooden honeycomb structure is 1.83 to 9.6 mm, specifically, the side lengths of the standard empty lattice are 1.83 mm, 2.75 mm, 3.0 mm, 3.67 mm, 4.0 mm, 5.5 mm, or 9.6 mm.

[0092] In this invention, the maximum size of the wooden honeycomb material is 2600 x 1300 x 1000 mm, and any size can be obtained within this size range by cutting.

[0093] The present invention further proposes a method for manufacturing the wooden honeycomb material. The method comprises S1) stacking multiple sheets of wood fiber paper coated with a core material adhesive alternately, heat-compressing and hardening them to obtain a honeycomb layer mass; S2) stretching the honeycomb layer mass to obtain a wooden honeycomb material; and S3) transferring a first resin onto the wooden honeycomb material, hardening and shaping it to obtain a wooden honeycomb material. The multiple sheets of wood fiber paper include unidirectional wood fiber paper and / or composite wood fiber paper. The composite wood fiber paper includes unidirectional wood fiber paper and a second resin layer and / or fiber-reinforced layer attached to the surface of the unidirectional wood fiber paper.

[0094] Referring to Figure 1, Figure 1 is a schematic diagram of the manufacturing process of a wooden honeycomb material according to the present invention.

[0095] Referring to Figure 2, Figure 2 is a sample diagram of different stages in the manufacturing process of the wooden honeycomb material according to the present invention.

[0096] This invention does not impose any special restrictions on the source of any raw materials; commercially available materials can be used.

[0097] In the present invention, the method for producing the unidirectional wood fiber paper includes A1) chemically modifying the unidirectional wood grain to obtain a unidirectional wood grain from which some substances have been partially removed, and A2) causing the unidirectional wood grain from which some substances have been partially removed to shrink along at least one direction to obtain unidirectional wood fiber paper. The shrinkage, according to the decomposition of forces, includes transverse shrinkage and thickness shrinkage.

[0098] In this invention, the types of unidirectional wood grain are those widely known to those skilled in the art, and without any special limitations, the invention includes, but is not limited to, walnut, oak, linden, rosewood, ebony, teak, rosewood, catalpa, ebony, cherry, cork, poplar, beech, Thai cherry, Scots pine, maple, white ash, etc.

[0099] The unidirectional wood grain is natural wood grain, which can avoid high environmental load artificial wood with excessive polymer materials mixed in the wood and the separation of the structure due to subsequent chemical reactions. The material of natural wood grain is environmentally friendly. Since cellulose, hemicellulose and lignin cross-link with each other in the naturally formed structure, the structural integrity can be maintained in subsequent chemical reactions. The wood fibers of the unidirectional wood grain are arranged relatively regularly, most of the wood fibers face the same direction, and the texture on the surface also faces the same direction. Therefore, such wood grain has a relatively high anisotropy. The reason for choosing the unidirectional wood grain instead of other wood grains with fibers facing in other directions is to consider that a relatively large internal stress will be released in subsequent processes. Only the unidirectional wood grain can better maintain the overall dimensional consistency and will not lead to defects. Removing some substances from the wood during the subsequent chemical reaction process is because it will lead to the internal stress of shrinkage in the wood after the reaction. Since the removed substances mainly concentrate between the wood fibers, the unidirectional wood grain after the chemical reaction may release the internal stress by concentrating it in one direction, and the wood grain may also shrink uniformly from the outside to the inside in the direction perpendicular to the longitudinal direction of the wood fibers. This makes it difficult for defects to occur in the wood grain. If other unidirectional wood grains with irregularly arranged fibers are used, the internal stress may be released in different directions, easily causing excessive local internal stress, resulting in defects such as cracks and causing the raw materials to be discarded. The thickness of the unidirectional wood grain is preferably 0.08 - 1 mm, more preferably 0.1 - 0.8 mm, still more preferably 0.1 - 0.5 mm, then more preferably 0.1 - 0.3 mm, and most preferably 0.2 - 0.8 mm. In the embodiment proposed in the present invention, taking the unidirectional wood grain with a thickness of 0.28 mm as a specific example, the maximum surface size of the unidirectional wood grain is preferably 3000×500 mm, and any size can be obtained through cutting within this size range. The surface density of the unidirectional wood grain is preferably 20 - 200 g / m 2 and more preferably 70 - 200 g / m 2And more preferably 70-180 g / m² 2 These are more preferably 70-150 g / m². 2 And more preferably 80-120 g / m² 2 Furthermore, preferably 90-110 g / m² 2 The most preferred amount is 100-110 g / m². 2 That is the case.

[0100] Chemical modification of a unidirectional wood grain yields a unidirectional wood grain from which some substances have been partially removed. The pH value of the chemical modifier is preferably 12 to 14, and the chemical modifier preferably contains an alkaline substance, a sulfonating agent, and water. Alkaline substances are widely known to those skilled in the art and, without special limitations, preferably include, but are not limited to, one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, and potassium bicarbonate in the present invention. The concentration of the alkaline substance in the chemical modifier is preferably 0.01 to 5 kg / L, more preferably 0.05 to 3 kg / L, and even more preferably 0.1 to 2 kg / L. In some embodiments proposed in the present invention, the concentration of the alkaline substance in the chemical modifier is specifically 0.1 kg / L, 0.05 kg / L, or 0.145 kg / L. The sulfonating agents are widely known to those skilled in the art and, without special limitations, preferably include, but are not limited to, one or more of sulfites, chlorulfonic acid, hydroxymethylsulfonate, sulfuryl chloride, and sulfamic acid in the present invention. The sulfite in question is preferably sodium sulfite. The concentration of the sulfonating agent in the chemical modifier is preferably 0.01 to 5 kg / L, more preferably 0.01 to 3 kg / L, and even more preferably 0.01 to 1 kg / L. In some of the embodiments proposed in the present invention, the concentration of the sulfonating agent in the chemical modifier is specifically 0.05 kg / L, 0.075 kg / L, or 0.072 kg / L. The concentration of the sulfonating agent in the chemical modifier may increase somewhat as the volume of the reaction solution increases, thereby compensating for the reduction in mass transfer caused by the increase in the chemical reaction. The chemical modifier may arbitrarily select a volume such as 500 mL, 2 L, 4 L, 20 L, 100 L, 500 L, 1000 L, 2000 L, 5000 L, 8000 L, 10000 L, etc. according to the production demand and the equipment specifications of the reactor. The material ratio between the unidirectional wood texture and the chemical modifier is preferably 4.6 - 184 cm 3 :1 L. The higher the material ratio, the higher the yield of a single reaction. Therefore, it is necessary to increase the material ratio of the normal reaction as much as possible, but it is also necessary to comprehensively consider the difficulty of mass transfer and the excessive accumulation of materials in the reactor. Alkaline substances react with lignin, hemicellulose, and cellulose in the unidirectional wood texture during the reaction process. Taking sodium hydroxide as an example of an alkaline substance and sodium sulfite as an example of a sulfating agent, hemicellulose may react with sodium hydroxide to form sodium hemicellulose (appearing in Reaction Formula 1), and lignin may react with sodium hydroxide and sodium sulfite to form sodium lignosulfonate (appearing in Reaction Formula 2 and Reaction Formula 3). The by-products of these reactions are separated from the structure of the unidirectional wood texture and either dissolve or float in the reaction solution. If the material ratio is too high, the efficiency of reactant mass transfer will decrease, and it will be difficult for reaction by-products to disperse uniformly in the system. This is because the local reaction rate decreases, the uniformity of the unidirectional wood texture after the reaction decreases, which will affect the stability of subsequent processes and the performance of the final product. Moreover, the excessive accumulation of materials in the reactor leads to damage to the unidirectional wood texture by increasing the friction between the unidirectional wood textures or the friction between the structure in the reactor during the reaction process.

[0101] [Reaction Formula 1] JPEG2026518090000002.jpg36165

[0102] [Reaction Formula 2] JPEG2026518090000003.jpg64165

[0103] [Reaction Equation 3] JPEG2026518090000004.jpg53165

[0104] In small-scale reactions of less than 5L, mass transfer and heat conduction within the system are relatively easy, and the number of unidirectional wood grains is quite small, allowing the entire wood grain to wrap around and adhere to the reactor wall. In small-scale reactions of 5L or more, the reaction scale is larger, the rates of mass transfer and heat conduction decrease, and the number of unidirectional wood grains is greater, so it is necessary to place the unidirectional wood grains into the reactor beforehand. Furthermore, pre-compartmentalization is necessary, which maximizes the use of the reactor's internal space and allows for the uniform distribution of unidirectional wood grain throughout the reactor. In addition, compartmentalization allows for the number of unidirectional wood grains within a single area to be kept constant, reducing damage to the unidirectional wood grains due to mutual friction and enhancing the mass transfer effect. The unidirectional wood grains are preferably placed in a raw material frame for chemical modification. The raw material frame includes a frame body, a partition plate, and a frame lid. The partition plate is installed inside the frame body. Holes are provided in the side walls of the frame body, the bottom of the frame body, the partition plate, and the frame lid. In one specific embodiment proposed in the present invention, the raw material frame is cylindrical, and a plurality of partition plates are arranged, which may be arranged at the same or different intervals around concentric circles within the frame body. In one specific embodiment proposed in the present invention, the raw material frame is a rectangular parallelepiped, and a plurality of partition plates are arranged, which may be parallel to each other within the frame body and arranged at the same or different intervals. Referring to Figures 3 and 4, the unidirectional wood grain can be pre-partitioned using the stacked raw material frames in this invention. Figure 3 is a schematic diagram of the structure of the raw material frame of an upright chemical reaction vessel. Figure 4 is a schematic diagram showing the unidirectional wood grain placed on the upright chemical reaction vessel. In this diagram, 1 represents the unidirectional wood grain, 3 represents the upright chemical reaction vessel, and the main structure of the raw material frame is composed of a mesh plate with a certain number of holes. The diameter of the holes is not so small as to not affect the mass transfer, nor is it so large as to damage the wood grain and reduce its structural strength. Generally, the diameter range of the holes is 3 to 5 mm, and the overall density of the holes is 4 × 10⁻⁶. 5 ~3.5×10 5 pieces / m 3 These are determined according to the actual construction method and equipment conditions. The appropriate mesh board thickness is necessary to ensure the structural stability of the frame body after the material is placed on it, and generally boards with a thickness of 1 to 5 mm are selected depending on the size of the raw material frame. The height of each layer is mainly determined according to the width of the wood grain to be processed, and is generally 10 to 30 cm. The outermost and innermost radii of the raw material frame are determined according to the specific reactor structure and the amount of material, and the spacing within the frame is not equal, but generally the distance increases sequentially from the inside to the outside, and the specific amount of increase depends on the thickness and number of wood grains. The basic criteria of this design are that it is easy to handle when loading the wood grain and that it is not damaged. Figure 5 is a schematic diagram of the structure of the raw material frame of the horizontal chemical reaction vessel proposed in the present invention. The overall external size of the raw material frame is determined according to the structure of the horizontal chemical reaction vessel. The height of each layer is determined according to the width of the raw material, and the thickness is determined according to the load capacity of the raw material and the size of the raw material frame. The raw material frame must be designed with a porous structure, with a typical hole diameter range of 3-5 mm and an overall hole density of 6.8 × 10⁻⁶. 5 ~5.0×10 5 pieces / m 3The internal partition plates are made of mesh plates with a thickness of 2 mm, and the partitions are spaced equally apart, with the distance increasing by 10 to 50 mm based on the width of the wood grain. Substances can freely transfer inside and outside the raw material frame, and the size of the pores is made as large as possible, thereby effectively partitioning the unidirectional wood grain, but this can affect the transfer of substances. The raw material frame needs to be designed to be close to the inner diameter of the reactor, and such stacked multi-layer raw material frames can make the most use of the reactor space. The material of the raw material frame needs to be made of alkali-resistant and heat-resistant material. Figure 6 is a schematic diagram showing the unidirectional wood grain proposed in the present invention placed on a horizontal chemical reaction vessel. In it, 1 represents the unidirectional wood grain and 2 represents the horizontal chemical reaction vessel.

[0105] The reactor can be an upright or horizontal chemical reaction vessel, and heating can be carried out in any manner within the reactor, as long as the temperature within the system is precisely controlled to within ±10°C. When using a large-volume reactor, the mass transfer can be enhanced by methods such as adding stirring, adding circulation to the solution, rotating the entire reactor, or using an external circulation pump to draw up the solution. In this invention, two options are given for the reaction temperature and pressure of the chemical modification. In the first method, water is boiled under atmospheric pressure, but this method requires the addition of a condensation recirculation module, which significantly increases reaction energy consumption. In addition, it ensures a complete reaction only under conditions where the reaction time under atmospheric pressure, i.e., the duration at the target temperature / surface pressure, is 24 to 72 hours, and in some embodiments proposed in this invention, the reaction time under atmospheric pressure is specifically 48 hours. Secondly, the target temperature, which is heated to a temperature above the boiling point of water within a sealed high-pressure system, is preferably 100-150°C, more preferably 110-150°C, even more preferably 120-130°C, and most preferably 125°C, forming a high-pressure system throughout the entire system, thereby eliminating the need to add a condensation recirculation module. In addition, the reaction time, or duration, can be shortened to 1-12 hours, more preferably 3-10 hours, even more preferably 4-8 hours, and most preferably 5-8 hours, which can significantly reduce the energy consumption of the reaction and potentially lower the process cost of the chemical reaction. Furthermore, the pumping capacity of the material pump is 1.4 to 3.5 t / h. The optimal reaction temperature depends on the type of wood and the size of the reactor, and different types of wood have different chemical compositions, resulting in slight differences in the temperature range. Generally, the larger the reactor size, the higher the reaction temperature is needed to compensate for the decrease in mass transition and heat conduction. Generally, the higher the reaction temperature, the faster the reaction rate, but since the hydrolysis of cellulose begins gradually at 150°C, and the mechanical properties of cellulose need to be kept as high as possible, the reaction temperature should be set below 150°C. In some embodiments proposed in the present invention, the temperature of chemical modification within a sealed, high-pressure system, i.e., the target temperature, is specifically 125°C, 116°C, or 130°C. In some embodiments proposed in the present invention, the target time for chemical modification in a sealed high-pressure system is specifically 6 hours, 8 hours, or 6.5 hours. When chemical modification is performed in a sealed high-pressure system, the target pressure for chemical modification is preferably 0.07 to 1.9 MPa.

[0106] The present invention does not impose any special restrictions on the heating rate of the chemical modification, and the modification is carried out under atmospheric pressure or in a sealed high-pressure system, with the heating rate of the chemical modification being specifically 0.2 to 5°C / min, preferably 0.5 to 5°C / min. In some embodiments proposed in the present invention, the heating rate is specifically 3°C / min, 2.5°C / min, 5°C / min, 2°C / min, 0.5°C / min, or 0.2°C / min. If the system temperature reaches and is maintained at the target temperature, the reaction of the sealed, high-pressure system must maintain the target temperature for 1 to 12 hours, or maintain it under atmospheric pressure for 24 to 72 hours, after which cooling will begin. Because chemically modified unidirectional wood grain begins to crystallize and reform intermolecular hydrogen bonds during the cooling process, the cooling method can significantly impact the final performance. If the cooling rate is too fast, the molecular chains of the unidirectional wood grain, with some material removed, will be fixed too quickly, preventing the intermolecular forces from being fully formed. This results in low crystallinity, larger crystal grains, and a negative impact on performance. Therefore, in the present invention, preferably, after the chemical modification is complete, the reaction solution is slowly cooled by exchanging heat with the external environment at room temperature. This cooling method has the potential to promote the formation of intermolecular forces and to yield crystals with higher crystallinity and larger grain sizes. Specifically, the cooling method is water cooling or air cooling, and more specifically, the cooling method is indirect water cooling, indirect air cooling, or direct water cooling. The cooling rate is preferably 0.2 to 10°C / min, and more preferably 1 to 10°C / min. In some embodiments proposed in the present invention, the cooling rate is specifically 0.2°C / min, 1°C / min, 0.5°C / min, 2°C / min, or 3°C / min.

[0107] After cooling to the working temperature (e.g., 60°C), preferably, the unidirectional wood grain, from which partial material has been removed, is washed and dried. The specific steps are as follows: Open the reactor and remove the unidirectional wood grain from which some of the material has been removed, or remove the raw material frame on which the unidirectional wood grain from which some of the material has been removed will be placed. Either wash the acquired raw materials as a whole with water, or wash the raw material frame on which the raw materials are placed as a whole with water. The cleaning process removes residual chemicals from the surface and converts any sodium cellulose that may form during the reaction into cellulose, thereby preserving the wood's chemical composition in a pure, natural state. Depending on the condition of the raw materials, the washing process may be performed multiple times. After washing, the raw material is dried, making it possible to obtain a unidirectional wood grain by directly removing localized substances. Drying the raw material can be done by natural drying or by accelerating drying in a drying box. The weight of unidirectional wood grain, with some material removed, is 10% to 60% lower than the weight of unidirectional wood grain, and further reduced by 35% to 55%. In some embodiments proposed in the present invention, the weight of the unidirectional wood grain with partial material removed is specifically 50%, 42%, 46.8%, 49.1%, 49%, or 48.2% lower than the weight of the unidirectional wood grain.

[0108] During the chemical modification process, the weight of the unidirectional wood grain decreases by 10% to 60%, and in the numerous voids that form in the microstructure, the unidirectional wood grain, with some material removed, exhibits good plastic deformation capacity and is easily compressed to a smaller size under external force. Furthermore, the weight reduction is due to the removal of a large amount of woody and semi-fibery from the unidirectional wood grain, thus increasing the proportion of fibrous material in the overall composition. Because cellulose exhibits superior performance among the three components of unidirectional wood grain, adjusting this ratio can potentially strengthen the material. Wood that has not been chemically modified has a relatively low plastic deformation capacity. When applying significant plastic deformation to wood that has not been chemically modified, it is generally necessary to perform steam heating and humidification treatment for 2 to 24 hours to achieve a sufficient softening effect. The shrinkage and densification processes are crucial, and they demonstrate that the material needs to have excellent plastic deformation capabilities to achieve volume compression in a short time. However, wood without any chemical modifications lacks this capability. Furthermore, chemically treated materials need to have a perfect and flat appearance, and the degree of reaction must be controlled during the chemical reaction. If the reaction is too strong, the wood surface will form many wrinkles that cannot be flattened. If the reaction is insufficient, the unidirectional wood surface will have a low degree of compression and inferior densification mechanical properties.

[0109] In this invention, the unidirectional wood grain after chemical modification has a wood element removal rate of 20% to 80% and a semi-fibrous element removal rate of 30% to 80%. Specifically, within the temperature and time range of the chemical modification proposed in this invention, the removal rates of wood element and semi-fibrous element are approximately positively correlated with temperature and time.

[0110] A unidirectional wood grain, from which a portion of the material has been removed, shrinks along at least one direction. This shrinkage, which follows the decomposition of forces, includes transverse shrinkage and thickness shrinkage. Transverse shrinkage and thickness shrinkage refer to the shrinkage occurring in two directions—the transverse direction and the thickness direction—perpendicular to the longitudinal direction of the fibers in unidirectional wood fiber paper, resulting in a densification effect. As long as contraction is possible in both the lateral (horizontal) and vertical (thickness) directions through force decomposition, it may be possible to select the number of contraction processes depending on the direction of the force.

[0111] In one specific embodiment proposed in the present invention, the shrinkage process includes a transverse shrinkage process and a thickness shrinkage process, i.e., a bidirectional shrinkage process. The force of the transverse shrinkage process intersects with the force of the thickness shrinkage process. It is possible to achieve bidirectional shrinkage of wood fiber paper in different pieces of equipment, or to achieve bidirectional shrinkage simultaneously or alternately in a single piece of equipment.

[0112] When processing raw materials, if the thickness of the unidirectional wood grain is less than 0.8 mm, lateral shrinkage is required. In the range of thin thicknesses, the lateral arrangement density of cellulose in the unidirectional wood grain, as well as the distribution of lignite and semifibers, are non-uniform at any given location, but the distribution of the reaction medium during chemical or biological processing is more uniform. If a certain area in the lateral direction has few celluloses and many lignite and semifibers removed, it is unavoidable that the partial area will lose more connective material through chemical modification, and the cellulose structure in that area will be in a dispersed state. If unidirectional shrinkage is performed in the thickness direction, the area will lack the necessary lateral connective force and will be prone to cracking.

[0113] In this invention, the lateral shrinkage treatment is preferably shrinkage due to an external mechanical force applied laterally and / or spontaneous shrinkage due to dehydration. The external mechanical force applied laterally intersects in plane with the extension direction of the wood fibers and / or fiber bundles in a unidirectional wood grain from which partial material has been removed.

[0114] The direction in which external mechanical force is applied laterally is widely known to those skilled in the art, and without imposing any special restrictions, any method is basically applicable as long as parameters such as surface pressure meet the construction method requirements. For example, a film material that exhibits lateral shrinkage is applied to a unidirectional wood surface from which some material has been removed, pressure is applied, and then the film material is removed. Suppressing the lateral shrinkage of the film material causes lateral shrinkage of the unidirectional wood surface, which has had some material removed, under the influence of frictional force between the film and the unidirectional wood surface, which has had some material removed. During this process, the tension of the membrane material affects the degree of lateral contraction, and the equivalent lateral contraction pressure achieved by suppressing the tension of the membrane material is preferably 0.001 to 1.5 MPa, and more preferably 0.01 to 1.5 MPa. In the free selection, the equivalent lateral contraction pressure achieved by suppressing the tension of the membrane material is within the range of 0.001 MPa, 0.002 MPa, 0.005 MPa, 0.01 MPa, 0.05 MPa, 0.08 MPa, 0.1 MPa, 0.2 MPa, 0.5 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, 1.4 MPa, 1.5 MPa, or any two of the above values. Furthermore, the frictional force applied to the surface of the unidirectional wood grain, which is separated from the film material and has had some material removed, also affects the lateral shrinkage of the unidirectional wood grain, which is separated from the film material. Therefore, the lower the roughness of the contact surface of the unidirectional wood grain, which is separated from the film material and has had some material removed, the better. Specifically, the surface roughness is preferably Ra6.3 or less, and in terms of free choice, the contact surface roughness is Ra0.0063, Ra0.025, Ra0.05, Ra0.1, Ra0.2, Ra0.4, Ra0.8, Ra1.6, Ra3.2, or Ra6.3. Furthermore, external forces can also be realized by mechanical forces such as rolling pressure or directly applied pressure. The surface pressure of the external mechanical force applied laterally is preferably 0.001 to 1.5 MPa, and more preferably 0.01 to 1.5 MPa. In the free selection, the surface pressure of the external mechanical force applied laterally is in the range of 0.001 MPa, 0.002 MPa, 0.005 MPa, 0.01 MPa, 0.05 MPa, 0.08 MPa, 0.1 MPa, 0.2 MPa, 0.5 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, 1.4 MPa, 1.5 MPa, or any two of the above values.

[0115] Lateral shrinkage can also be achieved under spontaneous forces acting within the unidirectional wood grain after partial material removal; that is, spontaneous shrinkage occurs due to dehydration, and thin wood fiber paper undergoes spontaneous lateral shrinkage when dehydrated. Referring to Figure 7, Figure 7 is a schematic diagram of collapse and shrinkage showing the state in which the cavities of wood fiber paper spontaneously shrink laterally. The principle is that, after chemical modification, some of the material is removed, and within the unidirectional wood grain, some of the woody and semi-fibrous elements that support the cavities are removed, resulting in a large number of voids in the microstructure that are easily filled with water. Furthermore, in the continuous wood grain, fibrous elements become the main component, and their chemical structure contains a large number of hydroxyl groups. Since these hydroxyl groups are hydrophilic, they also promote the entry of water molecules into the voids in the microstructure. In a dehydrated state, when water is removed from the voids, the voids disappear under the action of capillary force, the distance between the fine fibrous fibers rapidly shortens, and hydrogen bonds between the fine fibers are reformed. This structural shrinkage and the formation of chemical bonds result in a spontaneous lateral shrinkage effect. Macroscopically, wrinkles appear in the wood fiber paper, the lateral width decreases, and the density increases.

[0116] In another embodiment proposed in the present invention, the external mechanical force applied laterally is specifically a negative pressure applied to a unidirectional wood grain from which a portion of the material has been removed; the intensity of the negative pressure is less than 1 atmosphere. Under the action of the negative pressure, the material shrinks and deforms laterally, achieving a densification effect in the later direction. In this process, since the material is subjected to negative pressure in each direction, shrinkage deformation in the thickness direction may also occur.

[0117] In this invention, the lateral shrinkage is carried out under room temperature conditions or high temperature conditions. Specifically, the temperature of the lateral shrinkage treatment is preferably 15°C to 150°C, and more preferably 25°C to 130°C. In the free selection, the temperature of the lateral shrinkage treatment is within the range of 20°C, 25°C, 30°C, 50°C, 70°C, 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, or any two of the above values. The time of the lateral shrinkage treatment is preferably 1 s to 4 min. In the free selection, the time of the lateral shrinkage treatment is within the range of 1 s, 10 s, 30 s, 1 min, 2 min, 3 min, 4 min, or any two of the above values. After the lateral shrinkage treatment, the shrinkage rate is preferably 2% to 40% compared to the unidirectional wood grain raw material. In the free choice, the lateral contraction rate is 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, or within a range of any two of the above values.

[0118] In one specific embodiment proposed in the present invention, the lateral shrinkage treatment is specifically spontaneous lateral shrinkage, and more specifically, when a unidirectional wood surface from which some material has been partially removed is wet, a spontaneous lateral shrinkage effect is spontaneously brought about through drying, and after one or more spontaneous lateral shrinkages, when the unidirectional wood surface from which some material has been partially removed is re-watered, lateral shrinkage perpendicular to the fiber direction becomes apparent, and the lateral tensile strength is improved.

[0119] Conventional wooden boards can be densified by steam softening followed by thermal compression, but this densification process requires applying relatively high surface pressure to the wooden board over a long period of time. For the wood grain of this invention, if the grain is thin and direct thermal compression is applied, the grain is prone to cracking, and the resulting densification effect is limited. Wood grain that has undergone chemical modification loses 10% to 60% of its weight, and then another 35% to 55%, forming a large number of pores inside. Moreover, since the removed chemical components are mainly hydrophobic wood elements, the hydrophilicity of the unidirectional wood grain from which some substances have been removed is greatly increased through chemical modification. By rapidly filling the internal pores with water molecules, the entire structure becomes softer, making densification easier through natural water loss. Furthermore, the densification process consumes less energy and takes less time, making it suitable for mass production.

[0120] The process of spontaneous lateral shrinkage can occur even without any external mechanical force. Unidirectional wood grain, obtained through chemical modification and the removal of certain substances, can also exhibit the effect of spontaneous lateral shrinkage through the process of water filling and dehydration of its microstructure, a process known as wood keratinization. This principle is based on the fact that the microstructure of chemically modified wood contains a large number of voids, which are easily filled with water. Furthermore, cellulose is the main component in the continuous wood grain, and its chemical structure contains a large number of hydroxyl groups. These hydroxyl groups are hydrophilic, thus promoting the entry of water molecules into the voids of the microstructure. During this water filling process, the voids between the fine cellulose fibers clearly expand. In the subsequent dehydration process, as water is removed from the voids, the voids disappear under the action of capillary force, the distance between the fine cellulose fibers rapidly shortens, and hydrogen bonds between the fine fibers are reformed. This structural shrinkage and the formation of chemical bonds result in the effect of spontaneous lateral shrinkage. The densification effect is particularly pronounced in the transverse direction of the wood grain, perpendicular to the grain.

[0121] In this invention, the process of spontaneous lateral shrinkage achieves a complete densification effect through chemical and physical changes spontaneously applied during the dehydration process to a unidirectional wood grain obtained by chemical modification, from which partial material has been removed, without the use of an external pressure device. Specifically, spontaneous lateral shrinkage refers to the dehydration of a unidirectional wood grain from which partial material has been removed while it is still wet; that is, spontaneous lateral shrinkage includes a filling treatment and a dehydration treatment. The water filling treatment refers to moistening a unidirectional wood surface from which some material has been partially removed. The moisture content after the water filling treatment is preferably 60 to 120 wt%, and in the case of free selection, the moisture content after the water filling treatment is in the range of 60 wt%, 80 wt%, 100 wt%, 120 wt%, or any two of the above values. Dehydration is performed by natural drying and / or heat drying. When dehydration is performed in the environment by natural drying, the ambient humidity for natural drying is preferably less than 50% RH; otherwise, a lot of moisture will still remain after drying the unidirectional wood surface from which some material has been removed. When dehydration is performed by heat drying, the dehydration time can be shortened, resulting in a shorter overall process time. This also makes it possible to dry the unidirectional wood surface, with some material removed, to a moisture content of less than 10 wt%, potentially leading to a superior densification effect. The moisture content after dehydration is preferably 2 to 20 wt%. The present invention does not require any special conditions for drying temperature and drying time during the process of spontaneous lateral shrinkage, as long as the target moisture content can be reached in the end. Spontaneous lateral shrinkage can be repeated once or 2 to 10 times, with 2 to 6 times being preferred. When repeating spontaneous lateral shrinkage, after performing spontaneous lateral shrinkage once, the unidirectional wood surface from which some material has been removed is re-watered, and then the same lateral shrinkage method is performed again. The reason why repeated spontaneous lateral contractions lead to better densification of the material is that spontaneous lateral contractions are uncontrollable, and after one spontaneous lateral contraction, it becomes impossible to properly establish intermolecular forces in the unidirectional wood grain where a portion of the material has been removed. It becomes clear that when a unidirectional wood surface, from which some material has been partially removed after one or more spontaneous lateral shrinkages, is rewatered, the lateral width of the unidirectional wood surface, from which some material has been partially removed perpendicular to the fiber direction, shrinks to some extent, the lateral fiber bonding force strengthens, and irreversible lateral shrinkage occurs in parts, resulting in a densification effect.

[0122] In this invention, the thickness shrinkage treatment is performed by applying mechanical pressure in the thickness direction. Specifically, any method that satisfies the construction requirements, such as surface pressure, is generally applicable, as long as external mechanical pressure is applied in the thickness direction of the chemically treated wood surface to the extent that the wood surface shrinks in the thickness direction. The available equipment includes, but is not limited to, flatteners, vacuum forming machines, hot extrusion rolls, cold extrusion rolls, continuous flatteners, and continuous belt presses. As long as external mechanical pressure is applied, the wood surface becomes smooth on one side, and on the other side, under the action of the force, the wood surface becomes thinner in the thickness direction, excess moisture is pushed out, and a flat, densified, unidirectional wood fiber paper with a moisture content of less than 30% is obtained. Furthermore, thickness shrinkage can be performed on a single sheet or in a stacked state. That is, it is possible to perform the thickness shrinkage treatment on a single sheet or on multiple sheets stacked together. When performing thickness shrinkage on multiple sheets stacked together, the construction efficiency is higher. In terms of construction effects, the number of stacked wood sheets is generally preferably 2 to 20, and more preferably 3 to 20. The surface pressure during the thickness shrinkage treatment is preferably 0.01 to 80 MPa. When stacking wood sheets, the surface pressure during the thickness shrinkage treatment is preferably 0.1 to 60 MPa, and more preferably 3 to 10 MPa. In terms of free choice, the surface pressure during the thickness shrinkage treatment is 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 8 MPa, 10 MPa, 12 MPa, 15 MPa, 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, 45 MPa, 50 MPa, 55 MPa, 60 MPa, or within the range of any two of the above values. According to the formula for surface pressure and area, once the required surface pressure is determined, the more layers of unidirectional wood with partially removed material stacked, the greater the pressure on the flattening machine. When using a flattening machine, it is necessary to gradually increase the pressure to the target pressure, taking into account that the unidirectional wood with partially removed material is susceptible to damage from instantaneous high pressure. The thickness shrinkage treatment may be performed at room temperature or at a high temperature, with the specific method temperature range preferably being 15 to 150°C, and more preferably 25 to 130°C. Alternatively, the temperature for the thickness shrinkage treatment may be 15°C, 25°C, 35°C, 50°C, 80°C, 100°C, 120°C, 130°C, 150°C, or any two of the above values. To reduce construction costs, the thickness shrinkage treatment time is preferably 1 s to 4 min. If freely selected, the thickness shrinkage treatment time can be 0.1 min, 0.5 min, 1 min, 2 min, 3 min, 4 min, or any two of the above values. Performing the thickness shrinkage treatment at a high temperature shortens the process time but increases equipment costs.

[0123] In some embodiments proposed in this invention, thickness reduction is performed by rolling compression. Specifically, continuous thermal compression is performed using a pair of hot extrusion rolls rotating in opposite directions. Referring to Figure 8, which is a schematic diagram of the continuous thermal compression process of hot extrusion rolls, 6 represents a unidirectional wood grain with some material removed, and 7 represents a pair of hot extrusion rolls rotating in opposite directions. The direction of the force applied to the unidirectional wood fiber paper during rolling compression is indeterminate, but the direction after force decomposition is either transverse or thickness.

[0124] In some embodiments of the present invention, a continuous flattening machine is used to perform continuous hot-pressing for thickness reduction. Referring to Figure 9, Figure 9 is a schematic diagram of continuous hot-pressing using a continuous flattening machine. 6 represents a unidirectional wood surface with some material removed, 8 represents the flattening machine, and 9 represents the drive rolls.

[0125] In some embodiments proposed in the present invention, a continuous hot-pressure process is performed using a tape press for thickness reduction. Referring to Figure 10, Figure 10 is a schematic diagram of the continuous hot-pressure process using a tape press as proposed in the present invention. 6 represents a unidirectional wood surface with some material removed, and 10 represents the tape press.

[0126] In this invention, the lateral shrinkage treatment and thickness shrinkage treatment may be performed multiple times or once, alternately or simultaneously, depending on the use of different construction methods, resulting in different construction times and number of steps. Ultimately, the required execution time and number of steps are achieved according to the target parameters and the design construction method.

[0127] The effect of the bidirectional shrinkage treatment is manifested in the reduction of moisture content and thickness of the unidirectional wood grain from which partial material has been removed. The thickness of the unidirectional wood grain from which partial material has been removed becomes thinner after undergoing the bidirectional shrinkage treatment. The thickness of the wood grain after the bidirectional shrinkage treatment is preferably 15% to 80% of the thickness of the unidirectional wood grain. The moisture content of the wood grain that has been chemically modified, washed, and immersed is preferably reduced to 30% or less, and more preferably to 20% to 30%, after undergoing the bidirectional shrinkage treatment.

[0128] This invention utilizes a two-way shrinkage method to densify unidirectional wood fiber paper in both thickness and transverse (width) directions under external or spontaneous physical action. Transverse shrinkage increases the bonding strength and density of the unidirectional wood fiber paper in the transverse direction, preventing lateral cracking. Thickness shrinkage increases the density of the unidirectional wood fiber paper, improving its performance. The performance of the unidirectional wood fiber paper can be significantly improved through simultaneous or sequential shrinkage in both directions. Furthermore, when combined with temperature control, the unidirectional wood fiber paper shrinks and densifies rapidly, and is rapidly dehydrated, thus avoiding wrinkles and transverse cracks. The two-way shrinkage process proposed in this invention can usually be completed within 5 minutes, resulting in high process efficiency.

[0129] In some embodiments proposed in the present invention, the thickness shrinkage includes a hot-pressure treatment under negative pressure conditions. Hot-pressure treatment under negative pressure conditions allows for simultaneous thickness shrinkage, flattening, and dewatering of the unidirectional wood fiber paper. The surface pressure of the hot-pressure treatment is preferably 0.1 to 60 MPa, and more preferably 0.1 to 15 MPa. Freely selectable, the surface pressure of the hot-pressure treatment is in the range of 0.01 MPa, 0.05 MPa, 0.1 MPa, 0.5 MPa, 1 MPa, 5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, 45 MPa, 50 MPa, 55 MPa, 60 MPa, or any two of the above values. The flow rate under the negative pressure conditions is preferably 50 to 500 L / min. In the case of free selection, the flow rate under the negative pressure conditions is within the range of 50 L / min, 80 L / min, 100 L / min, 150 L / min, 200 L / min, 250 L / min, 300 L / min, or any two of the above values. The temperature of the heat-pressure treatment is preferably 50°C to 150°C. In the case of free selection, the temperature of the heat-pressure treatment may be 50°C, 80°C, 100°C, 120°C, 130°C, 150°C, or within the range of any two of the above values. The duration of the heat and pressure treatment is preferably 0.5 to 20 minutes. In the case of free selection, the duration of the heat and pressure treatment is within the range of 0.5 min, 1 min, 2 min, 3 min, 4 min, 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, 20 min, or any two of the above values. When thickness shrinkage is achieved solely through hot and pressure treatment under negative pressure conditions, the process takes a long time due to the low pressure.

[0130] In this invention, depending on the size of the unidirectional wood fiber paper, the unidirectional wood fiber paper is joined together either before or after the bidirectional shrinkage treatment. The flatness of the wood fiber paper after the bidirectional shrinkage treatment is improved, and the moisture content is reduced. However, due to size limitations on the raw wood grain, the wood grain used in the chemical treatment does not connect seamlessly, and it is necessary to join wood fiber paper into various sizes to meet the usage requirements. It is possible to cut the wood fiber paper according to the actual demand when using it, and then theoretically join the entire wood fiber paper to an infinite width and length in order to manufacture products of different sizes. The size of the unidirectional wood fiber paper used for joining is preferably 0.1 to 5 m in length and preferably 0.01 to 1 m in width. This invention makes it possible to join two or more sheets of unidirectional wood fiber paper, mainly to meet the size requirements of the joined wood fiber paper. The essence of this joining process is to mark the joint contour on unidirectional wood grain or bidirectional shrink-treated wood fiber paper from which partial material has been removed, and then join the corresponding parts. More specifically, the joining areas are pre-designed on unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be joined has been removed before joining, the respective joint contours are marked, and then several joining techniques are used to join together several dispersed pieces of unidirectional wood grain or shrink-treated wood fiber paper to form a single large sheet of unidirectional wood fiber paper. After joining, the thickness of the wood fiber paper at the joint is approximately 0.08 to 0.12 mm.

[0131] In this invention, it is possible to join the unidirectional wood fiber paper by stacking partial areas as shown in the upper part of Figure 11, or by not stacking any areas as shown in the lower part of Figure 11.

[0132] In the present invention, the joining method may be carried out by one or more of the following means: joining with adhesive, joining with adhesive wire, wet extrusion joining, and coating joining.

[0133] In some embodiments proposed in the present invention, bonding may be carried out by means of adhesive. Specifically, adhesive is applied to the overlapping portion of one sheet of unidirectional wood grain or shrink-treated wood fiber paper from which a portion of the material to be bonded has been partially removed, and then the overlapping portion of the other sheet of unidirectional wood grain or shrink-treated wood fiber paper from which a portion of the material to be bonded is pressed onto the sheet to be bonded, thereby increasing the size of the joined wood fiber paper by joining the overlapping portions of the two sheets of unidirectional wood grain or shrink-treated wood fiber paper from which a portion of the material to be removed has been partially removed after the adhesive has hardened. The overlapping areas are thicker than other parts because they are the thickness of unidirectional wood grain or shrink-treated wood fiber paper with the two partial materials removed. This allows pressure to be applied to the overlapping areas, thereby reducing the thickness of the overlapping areas and improving the uniformity of the overall thickness of the wood fiber paper.

[0134] In some embodiments proposed in the present invention, joining may be carried out by means of adhesive wires. Specifically, the contour shape of unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded is designed to be a complete bond, the contours of two unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded are bonded together, and then the two bonded contours are joined using adhesive wires, the adhesive wires adhering the surfaces of the unidirectional wood fiber paper, and the position of the two unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded is fixed by the connected adhesive wires, thereby achieving the purpose of joining the unidirectional wood fiber paper. To improve the durability of the joint, on the one hand, the number of adhesive wires joining the two unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded may be increased, and on the other hand, both sides of the unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded may be joined together. The advantage of joining with adhesive lines is that there are no overlapping sections between the two unidirectional wood fiber paper sheets when joining them, and the size of the wood fiber paper can be increased only by bonding the contours, thereby roughly matching the thickness of the wood fiber paper at the joint with the rest of the sheet.

[0135] In some embodiments proposed in the present invention, wet extrusion bonding may be used as a means of bonding. Specifically, wet extrusion bonding is similar to bonding with adhesive, but without adhesive, using only water. Water is added to the overlapping portion of unidirectional wood grain or shrink-treated wood fiber paper from which the partial material to be bonded has been removed, so that it is completely submerged in water. Subsequently, the overlapping portions are placed together, and a large planar pressure (≧5MPa) is applied, with auxiliary heating to dry the wood fiber paper until it is dehydrated and adheres, thereby achieving the purpose of bonding. In a wet state, the tissue of unidirectional wood grain or shrink-treated wood fiber paper from which the partial material has been removed is soft, and under the action of large pressure, the tissues of the two unidirectional wood grain or shrink-treated wood fiber paper from which the partial material has been removed are pressed tightly together, causing them to adhere to each other and form hydrogen bonds. Maintaining this pressure until the wood fiber paper is dry establishes this bonding force and completes the bonding. The advantages of wet extrusion bonding are that it preserves the natural properties of wood fiber paper well, allows for the easy production of wood fiber paper of any size and width, and, in subsequent processes such as coating / pre-impregnation, theoretically has the potential to produce continuous prepregs of an infinite number of sizes.

[0136] In some embodiments proposed in the present invention, coating bonding may be used as a means. Specifically, a continuous adhesive film is selected according to the target size, and then small-sized unidirectional wood fiber paper is pressed onto the adhesive film, thereby achieving the objective of increasing the size by joining the individual small-sized unidirectional wood fiber paper through the joints of the adhesive film. The type of adhesive film can be selected according to demand, or it can be made in-house by mixing thin felt with adhesive. The principle essentially involves adding a layer of film to join small-sized unidirectional wood fiber paper. This method theoretically makes it possible to produce continuous prepregs of infinite size.

[0137] In this invention, the thickness shrinkage treatment does not include the hot-pressure treatment under negative pressure conditions described above. The material is shrunk and flattened to obtain unidirectional wood fiber paper.

[0138] Through the planarization process, the wood surface that has undergone shrinkage treatment is dehydrated more efficiently and quickly, and better flatness is achieved during the dehydration process, thereby obtaining unidirectional wood fiber paper. The effect of planarization is mainly manifested in the rapid and efficient improvement of the flatness of the wood fiber paper and the reduction of moisture content, resulting in dry, flat, unidirectional wood fiber paper.

[0139] In the present invention, more specifically, the moisture content of the unidirectional wood fiber paper obtained by the planarization process may be 10 wt% or less.

[0140] In this invention, when performing the planarization process, exhaust passages are provided on the double-contact surface or single-contact surface of the unidirectional wood fiber paper. Specifically, the planarization process may be performed using various equipment such as a heatable negative pressure molding machine or a vacuum hot extrusion machine, for example, a vacuum hot extrusion machine equipped with multiple exhaust passages. The planarization process is characterized by allowing water vapor to be discharged by directly arranging exhaust passages on both or one side of the wood fiber paper, which is heated and subjected to pressure during the processing. Generally, the surface pressure during the planarization process is significantly lower than the surface pressure used during the thickness shrinkage process, because if the surface pressure is too high, the water vapor discharge rate decreases somewhat, reducing the planarization efficiency. The purpose of selecting pressure for the planarization process is to prevent wrinkles from forming in the unidirectional wood fiber paper during the drying process. The surface pressure that can be used for the planarization process is 0.01 to 2 MPa. In the optional configuration, the surface pressure of the planarization process is within the range of 0.01 MPa, 0.05 MPa, 0.1 MPa, 0.5 MPa, 1 MPa, 1.5 MPa, 2 MPa, or any two of the above values. The temperature of the planarization process is 40°C to 150°C. In the optional configuration, the temperature of the planarization process is within the range of 40°C, 50°C, 70°C, 80°C, 100°C, 120°C, 150°C, or any two of the above values. By properly installing exhaust passages on the contact surface of the unidirectional wood fiber paper, planarization can be completed within 0.1 to 4 minutes. In the optional configuration, the time of the planarization process is within the range of 0.1 min, 0.5 min, 1 min, 2 min, 3 min, 4 min, or any two of the above values.

[0141] In the present invention, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer adhering to the surface of the unidirectional wood fiber paper. The method for producing the composite wood fiber paper includes transferring a diluted second resin raw material to the surface of the unidirectional wood fiber paper, curing it, and then obtaining the composite wood fiber paper. Preferably, the second resin raw material is one or more of a monomer of the second resin, a prepolymer of the second resin, and the second resin. The solid content of the diluted second resin raw material is preferably 1% to 40%, more preferably 3% to 30%; by increasing the dilution ratio, a second resin layer with an extremely low surface density can be obtained. In some embodiments proposed in the present invention, the solid content of the diluted second resin raw material is specifically 11.7% or 6.8%. The transfer method is well known to those skilled in the art and may be carried out by immersion, or by spraying or misting. When the diluted second resin raw material is transferred to the surface of the unidirectional wood fiber paper, the solvent evaporates, causing the second resin raw material to form a film. Then, under curing conditions, it solidifies, thereby obtaining the second resin layer. The second resin raw material may be monomeric small molecules, specifically monomeric small molecules of the thermosetting resin or the thermoplastic resin. When the second resin raw material is applied to the surface of unidirectional wood fiber paper, the monomeric small molecules harden under the curing conditions. The second resin is either the thermosetting resin or the thermoplastic resin described above, and the solvent required for dilution can be selected according to the type of second resin. If a solvent is required for water-soluble dilution, water is selected. The curing conditions can be selected according to the type of raw material.

[0142] In one specific embodiment proposed in the present invention, the composite wood fiber paper is manufactured by rolling compression. A diluted second resin material is uniformly sprayed onto the surface of unidirectional wood fiber paper, the unidirectional wood fiber paper is stacked parallel to each other according to the required width, and most of the solvent in the diluted second resin material is evaporated through artificial or natural drying at a constant temperature. The material is then passed through a pair of hot extrusion rolls at a constant temperature, where the hot extrusion rolls dry by heating and extrusion to ensure surface flatness. After 2-3 extrusions, composite wood fiber paper containing the second resin layer is obtained. With the addition of the second resin layer, the surface density of the composite wood fiber paper is 3-40 g / m² higher than that of unidirectional wood fiber paper. 2 It goes up.

[0143] In the present invention, the composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer and a fiber reinforcement layer attached to the surface of the unidirectional wood fiber paper. Preferably, the second resin layer and the fiber reinforcement layer are attached sequentially to both surfaces of the unidirectional wood fiber paper. The method for manufacturing the composite wood fiber paper includes transferring a diluted second resin raw material to the surface of the unidirectional wood fiber paper, then coating it with a fiber reinforcement layer, curing it, and then obtaining the composite wood fiber paper. The diluted second resin raw material is the same as described above and will not be repeated here. The material required for the coating is preferably a solid film material that adheres to the surface of the unidirectional wood fiber paper via the second resin raw material and provides a cross-bonding effect to the unidirectional wood fiber paper. The material required for the coating needs to be a material with low surface density, and surface materials with low surface density and excellent mechanical properties, such as carbon fiber surface felt or glass fiber surface felt, can be selected.

[0144] In one specific embodiment proposed in the present invention, the composite wood fiber paper is manufactured by a rolling compression operation. A diluted second resin raw material is uniformly sprayed onto the surface of unidirectional wood fiber paper, the unidirectional wood fiber paper is stacked parallel to each other according to the required width, a fiber-reinforced layer is coated through a coating process, most of the solvent in the diluted second resin raw material is evaporated through artificial or natural drying at a constant temperature, and then the material is passed through a pair of hot extrusion rolls at a constant temperature, where the hot extrusion rolls dry by heating and extrusion to ensure surface flatness. After 2-3 extrusions, composite wood fiber paper containing the second resin layer and the fiber-reinforced layer is obtained. When the second resin layer is combined with the fiber-reinforced layer, the surface density of the composite wood fiber paper is 10-50 g / m² higher than that of unidirectional wood fiber paper. 2 It goes up.

[0145] Referring to Figure 12, Figure 12 is a photograph showing actual samples of different composite wood fiber papers. Referring to Figure 13, Figure 13 is a schematic diagram of the structure of composite wood fiber paper. Referring to Figure 14, Figure 14 is a schematic diagram showing the joining of unidirectional wood fiber papers using a coating layer.

[0146] Wood is a material with significant anisotropy, where the mechanical properties in the direction parallel to the longitudinal direction of the fibers are superior to those in the direction perpendicular to the longitudinal direction of the fibers. The cross-linking composite method improves the mechanical properties in the direction perpendicular to the longitudinal direction of the fibers, thereby increasing the stability of subsequent construction methods and ultimately improving the mechanical properties of the wooden honeycomb material. In the method proposed in this invention, a low-density resin layer and a coating layer are used to composite unidirectional wood fiber paper, and the second resin layer and fiber reinforcement layer play a role in binding the wood fibers, thus resembling cross-linking with wood fibers.

[0147] Multiple sheets of wood fiber paper coated with core material adhesive are stacked alternately, then heat-compressed and hardened to obtain a honeycomb layered mass. Specifically, the core material adhesive is applied to designated positions on the surface of multiple sheets of wood fiber paper, then the multiple sheets of wood fiber paper are stacked, and the core material adhesive is hardened through heat compression, thereby integrating the multiple sheets of wood fiber paper and obtaining a honeycomb layered mass. The formation of a pore structure in the honeycomb material is due to the shifting and stretching of the adhesive joints between adjacent upper and lower sheets of paper. The effect of applying adhesive and stacking the paper mainly manifests as an increase in the overall thickness of the structure, and the number of sheets of paper contained in one honeycomb layered mass and the shifted distance between them and the core material adhesive ultimately determine the pore size of the honeycomb material. Referring to Figure 15, Figure 15 is a schematic diagram of two application directions when applying the core material adhesive to composite wood fiber paper. The left diagram shows the wood fiber paper before adhesive application, and the right diagram shows the wood fiber paper after adhesive application. The upper right diagram shows that the direction of application of the core material adhesive is perpendicular to the longitudinal direction of the fibers, and the lower right diagram shows that the direction of application of the core material adhesive is parallel to the longitudinal direction of the fibers. Referring to Figure 16, Figure 16 is a schematic diagram of the positions where the core material adhesive proposed in the present invention is applied to wood fiber paper. The core material adhesives on adjacent wood fiber paper are offset from each other.

[0148] In one specific embodiment proposed in the present invention, the method for applying the core material adhesive may be (1) a silkscreen printing method, (2) a roll-to-transfer method, or (3) a flat plate transfer method. The above methods uniformly transfer the core material adhesive, which has a certain width and thickness, onto the wood fiber paper at a certain distance, ensuring good parallelism and eliminating cut edges in the core material adhesive. In this method, the core material adhesive may be one of the following: epoxy resin, acrylic resin, etc.

[0149] More specifically, the silkscreen printing method involves selecting a silkscreen with an appropriate mesh size according to the size of the voids in the pre-designed honeycomb structure, determining the depth of the core material adhesive, designing the spacing of the core material adhesive, and ensuring the width meets the size requirements of the voids in the honeycomb structure. Wood fiber paper of a certain length and width is cut according to the size of the pre-designed honeycomb material, and the core material adhesive is transferred to the wood fiber paper by rubbing and coating with a silkscreen printing machine. Then, multiple layers of wood fiber paper are bonded together in a continuous, overlapping manner to obtain a honeycomb layered mass. During this process, odd-numbered layers of wood fiber paper are stacked on top of odd-numbered layers of core material adhesive, and even-numbered layers of wood fiber paper are stacked on top of even-numbered layers of core material adhesive.

[0150] More specifically, the roll-to-roll transfer method involves selecting a grooved roll with an appropriate diameter according to the size of the voids in the designed honeycomb structure, designing the spacing, width, and depth of the grooves in the grooved roll, immersing a gloss roll in the core material adhesive, transferring the core material adhesive into the grooves of the grooved roll through the rotation of the roll pair, and removing the resin on the surface of the grooved roll using a scraper, leaving only the core material adhesive in the grooves, passing a piece of wood fiber paper of a certain length and width through the gap between the grooved roll and the gloss roll, transferring the core material adhesive in the grooved roll to the surface of the wood fiber paper, and then obtaining a honeycomb multilayer mass by continuously shifting and bonding multiple pieces of wood fiber paper to which the core material adhesive is applied. During this process, odd-numbered layers of wood fiber paper are stacked on top of odd-numbered layers of core material adhesive, and even-numbered layers of wood fiber paper are stacked on top of even-numbered layers of core material adhesive.

[0151] More specifically, the planar transfer method involves cutting out wood fiber paper of a certain length and width according to the size of the void cells of the pre-designed honeycomb structure, designing a transfer plane with parallel double rows of protrusions according to the size of the wood fiber paper, and the width and spacing of the protrusions matching the style of the honeycomb material to be designed. When applying the core material adhesive, the protrusions contact the liquid surface of the core material adhesive to a certain depth, then a certain force is applied to transfer the resin soaked in the protrusions to the wood fiber paper, and after repeating this operation many times, a honeycomb multilayer mass is obtained by continuously shifting and bonding multiple sheets of wood fiber paper. During this period, odd-numbered layers of wood fiber paper are stacked on odd-numbered layers of core material adhesive, and even-numbered layers of wood fiber paper are stacked on even-numbered layers of core material adhesive.

[0152] In this invention, before stretching the honeycomb layered mass, ear-shaped bands are attached to both ends of the honeycomb layered mass, and the ear-shaped bands are fixed to a tensioning machine. Then the honeycomb layered mass is stretched to obtain a wooden honeycomb material. The honeycomb layered mass can be stretched directly to the target length, or it can be stretched to 1 / 3 to 1 / 2 of the target length. By stretching the honeycomb layered mass, a regular cavity structure is formed. In the previous step, the paper is only bonded locally, so the unbonded areas expand under the action of tensile force, forming a honeycomb structure. Referring to Figure 17, Figure 17 is a schematic diagram of the manufacturing process of the wooden honeycomb material.

[0153] In this invention, a first resin is transferred onto a wooden honeycomb material, cured and shaped to obtain a wooden honeycomb material. The roles of the resin coating layers are, firstly, to shape the honeycomb structure, and secondly, to increase density and improve mechanical properties. The raw material of the first resin may be a polymer prepolymer or a monomeric small molecule. Preferably, it is one or more of the following: epoxy resin, phenolic resin, unsaturated polyester resin, or furfuryl alcohol resin. The method for transferring the first resin is well known to those skilled in the art and can be selected according to the type of first resin without any special restrictions. When the viscosity of the resin is relatively low, the first resin can be uniformly applied to the honeycomb structure of the wooden honeycomb material by repeating the dipping process several times. When the viscosity of the resin is relatively high, the first resin can be sprayed, applied, or brushed into the empty cells of the wooden honeycomb material, and then the wooden honeycomb material is stretched and pressed down before the first resin is uniformly applied to the honeycomb structure.

[0154] In one specific embodiment proposed in the present invention, the first resin is a low-viscosity resin, and the first resin is transferred onto a wooden honeycomb material multiple times, and the material is cured and shaped multiple times to obtain the wooden honeycomb material. The curing and shaping process is performed multiple times between two transfers, and the curing and shaping process is also performed at the end. The transfer method is selected from one or more of spraying, spraying, and coating. More specifically, the wooden honeycomb material is obtained by repeatedly spraying, spraying, or coating the first resin onto the wooden honeycomb material and curing it repeatedly (curing is performed before each spraying, spraying, or coating).

[0155] In one specific embodiment proposed in the present invention, the first resin is a low-viscosity resin. S3) The wooden honeycomb material is transferred to a drying box to remove moisture and dried, then the wooden honeycomb material is immersed in the first resin for a certain period of time, lifted out and the excess first resin is drained out, and cured at the curing temperature of the first resin. After curing is complete, the above immersion curing process is repeated several times until the target density of the wooden honeycomb material is reached. This method is suitable for gluing wooden honeycomb materials in the range of low and high density.

[0156] In one specific embodiment proposed in the present invention, the first resin is a high-viscosity resin. The step of transferring the resin onto the wooden honeycomb material in S3) is carried out according to the steps of applying the first resin to the empty lattices of the wooden honeycomb material by means of spraying, spraying, or coating, then stretching and pressing the wooden honeycomb material, and then uniformly coating the wooden honeycomb material with the first resin.

[0157] In one specific embodiment proposed in the present invention, the first resin is a high-viscosity resin. S3) The first resin is uniformly applied to the void walls of the wooden honeycomb material, which has been stretched to 1 / 3 to 1 / 2 of a target length, by means of spraying, spraying, or coating. The tensioner is then operated in a return stroke until the void walls of the void contact each other, and a constant force is applied to press both sides of the ear-shaped bands of the honeycomb layer mass, thereby pushing out the excess resin from the wooden honeycomb voids. The series of operations of stretching, returning, and extruding is repeated 3 to 4 times to uniformly apply a quantitative amount of resin to the void walls of the wooden honeycomb structure, thereby achieving the target density of the wooden honeycomb material. The tensioner is then started again, and the honeycomb layer mass is slowly stretched to a certain length to form a regular hexagonal cavity structure. Finally, the wooden honeycomb material is cured at the curing temperature of the first resin. This method is suitable for gluing wooden honeycomb materials ranging from low to medium density.

[0158] Referring to Figure 18, Figure 18 is a schematic structural diagram of the wooden honeycomb material proposed in the present invention, where 11 represents an empty lattice. Referring to Figure 19, Figure 19 is a top view of the wooden honeycomb material proposed in the present invention, where the cells of this wooden honeycomb material are hexagonal. Referring to Figure 20, Figure 20 is a top view of the wooden honeycomb material proposed in the present invention, where the cells of this wooden honeycomb material are square.

[0159] The core material of the wooden honeycomb material proposed in the present invention, that is, wood fiber paper, is a natural material with low environmental impact. In particular, all components of the unidirectional wood fiber paper and its components are wood, and most of the components of the composite wood fiber paper are also wood. Moreover, both the mechanical properties parallel to the longitudinal direction of the wood fiber and the mechanical properties perpendicular to the longitudinal direction of the wood fiber are quite excellent. The wooden honeycomb material obtained thereby has the advantages of excellent mechanical properties, weight reduction, low cost, and low environmental impact.

[0160] The present invention further proposes a wooden honeycomb member, which includes the above-mentioned wooden honeycomb material. Referring to FIG. 21, FIG. 21 is a schematic diagram of the sandwich structure of the wooden honeycomb member proposed in the present invention.

[0161] The present invention further proposes the application of the above-mentioned wooden honeycomb material or composite wood fiber paper in one or more of building materials, furniture materials, sports goods, support members, vehicles, and aircraft.

[0162] In the present invention, unless otherwise specified, the above surface pressure all refers to the pressure received on the surface of the single-direction wood grain and the single-direction wood fiber paper.

[0163] In order to further interpret the present invention, we will describe in detail the wooden honeycomb material proposed in the present invention and its manufacturing method in combination with examples.

[0164] The reagents used in the following examples are all commercially available. PU solution: Deep ▲Sen▼ Yoshida Chemical F0409; Epoxy resin: Yituo Composite Materials YTCC302; Adhesive for epoxy structure: Shanghai Haiying SK-2012; PO hot adhesive: Xingxia hot adhesive film XJO115; PA hot adhesive: Xingxia hot adhesive film XWA116; Acrylic resin: 3M-AD118; Phenolic resin: Sumitomo PR-43204.

[0165] Manufacture of Unidirectional Wood Fiber Paper / Composite Wood Fiber Paper

[0166] Example 1

[0167] 1) Chemical treatment The reaction solution is prepared in advance, with a total volume of 100 L. The reactor is an upright chemical reaction vessel (connected to an external circulation pump), and the raw material frame of the upright chemical reaction vessel provided in this invention is placed on a unidirectional wooden surface for chemical processing. When sodium hydroxide and sodium sulfite are dissolved in water, the concentration of sodium hydroxide in the reaction solution is 100 g / L, the concentration of sodium sulfite is 50 g / L, and the pH value of the reaction solution is 14. Subsequently, 0.49 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is placed under high pressure. After maintaining the target temperature and pressure for 6 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with partial material removed is taken out, and the unidirectional wood grain with partial material removed is washed with water to complete the chemical modification. Refer to Figure 22, which is a photograph of the unidirectional wood grain with partial material removed in a wet state. As a result, the weight of the unidirectional wood grain with partial material removed is reduced by 50%.

[0168] 2) Spontaneous lateral contraction Take one piece of wood grain (10 cm wide) obtained in Step 1). Place the wood grain in a drying box and heat to 80°C. After 2-3 minutes, it reaches a dry state, and transverse shrinkage perpendicular to the grain direction is evident, with the apparent width decreasing by 50% and obvious wrinkles appearing on the wood grain. The fact that the width cannot be completely restored after re-soaking and expansion indicates that some irreversible transverse shrinkage has occurred. Refer to Figure 23, which is a schematic diagram showing the state of spontaneous transverse shrinkage of unidirectional wood grain with some material removed.

[0169] 3) Shrinkage and planarization in the thickness direction Using a vacuum hot press while the wood grain (raw material thickness approximately 0.28 mm) obtained in step 2) has been laterally shrunk along the thickness direction, with a surface pressure of 6 MPa and a compression time of 0.5 minutes, and the shrinkage treatment is carried out at 110°C. During compression, it is necessary to increase the pressure slowly to avoid crushing the wood grain due to excessive impact, and the compression direction should be perpendicular to the thickness of the wood grain fibers. Because most of the semi-crystalline and woody elements are removed by the chemical modification in step 1), the pore structure of the wood is completely opened, and hydroxyl groups on the surface of hydrophilic crystalline elements are introduced during the process of water penetration and extrusion to form new hydrogen bonds. Thus, adjacent wood fibers are firmly bonded to each other, resulting in a dense wood grain with significantly improved mechanical properties. After shrinkage in the thickness direction, the thickness of the wood grain decreases to approximately 0.08 mm, and the moisture content is 20%. Next, the negative pressure is stopped and additional positive pressure is applied (pressure in the thickness direction of the wood fiber paper is approximately 0.5 MPa), and a dry, flat, unidirectional wood fiber paper is obtained under conditions where the flow rate is approximately 150 L / min, the temperature is still 110 degrees, and this is maintained for 4 minutes. Unidirectional wood fiber paper is rarely cracked, with a probability of less than 5%, and has an average thickness of 0.08 mm. According to the flatness test method described in the specification, the wood fiber paper is placed between two smooth, flat glass plates, a small planar pressure of approximately 4500 Pa is applied to the glass surface, and the gap between the glass plates (considering that the glass plates are not perfectly flat, this gap is the maximum apparent thickness between the highest and lowest points of the wood fiber paper) is measured to 0.15-0.2 mm. The average moisture content is 4%, and the final width is approximately 30% lower than the width of chemically treated damp wood. Based on the plastic tensile test standard "GB / T1040.1-2006", a mechanical tensile test is performed on it, with a wood fiber specimen width of 4 mm, a tensile speed set to 2 mm / min, and the tensile curve obtained is shown in Figure 24. Figure 24 is a test curve diagram of tensile stress-deformation along the longitudinal direction of the fibers of the wood fiber paper. As can be seen from Figure 24, the average breaking strength is 381 MPa and the average modulus of elasticity is 32 GPa. The tensile strength perpendicular to the fiber direction is 8.7 MPa and the tensile modulus is 1.74 GPa.

[0170] Comparative Example 1

[0171] The chemical treatment is the same as in Example 1. There is no lateral shrinkage step; the chemically treated, damp wood (10 cm wide) is directly shrunk along the thickness direction using a vacuum hot press, with the pressure still at 6 MPa and the compression time at 0.5 minutes. As in Example 2, the negative pressure is then stopped and additional positive pressure is applied (pressure in the thickness direction of the wood fiber paper is approximately 0.5 MPa), with a flow rate of approximately 150 L / min and a temperature still at 110 degrees, which is maintained for 4 minutes. When the vacuum hot extrusion machine was opened, cracks were found in the wood fiber paper, with a cracking rate of approximately 40%. The average thickness was 0.07 mm, which is thinner than the transversely shrunk wood grain, and the width remained essentially unchanged. Refer to Figure 25, which is a photograph showing a real chemically treated unidirectional wood grain that shrinks only in the thickness direction. When a mechanical tensile test was performed on it, the tensile performance of the wood fiber paper was as follows: The average tensile strength in the fiber direction was 348 MPa, the average tensile modulus was 30 GPa, the tensile strength perpendicular to the fiber direction was 4.8 MPa, and the tensile modulus was 1.1 GPa.

[0172] Table 1 shows the average parameters and performance of the unidirectional wood fiber paper obtained in Example 1 and Comparative Example 1 for wood fiber paper of the same lot and specifications.

[0173] [Table 1]

[0174] Example 2

[0175] The chemical treatment was the same as in Example 1, but a different method was used for lateral shrinkage, while the thickness compression was the same. The wood fiber paper was placed on a smooth metal base with a surface roughness of Ra1.6, and a cover plate was placed on top of it. The cover plate was made of a pre-stretched silicone flexible film, with tension perpendicular to the fiber direction of the wood fiber paper, and the tension was adjustable. A pressure of approximately 0.5 MPa was applied to the cover plate, causing the silicone flexible film to adhere tightly to the wood fiber paper and generate pressure. During the process of releasing the tension of the silicone flexible film, the wood fiber paper contracted laterally under the action of friction. In this example, by controlling the tension of the silicone flexible film, shrinkage pressures corresponding to 0.002 MPa, 0.2 MPa, and 1.2 MPa were achieved. The thickness shrinkage ratio and lateral shrinkage ratio of the wood fiber paper obtained in this comparative example were measured, and then the tensile mechanical properties were measured. The results are shown in Table 2.

[0176] [Table 2]

[0177] Example 3

[0178] The chemical treatment and lateral shrinkage are exactly the same as in Embodiment 1, and thickness shrinkage is performed by rolling compression. By adjusting the gap between the rolls, it is possible to improve the effect of adjusting the pressure in the thickness direction, as shown in Figure 8. During rolling compression, the wood fiber paper is subjected to a resultant force consisting of pressure and friction acting in the thickness direction, and this resultant force acts in the direction shown by the dotted line in the figure. The wood fiber paper exhibits a good shrinkage effect under the action of the component force (pressure) in the thickness direction. In this comparative example, the final gap between the rolls was set to 0.07 mm, and the average thickness of the shrunk wood fiber paper was 0.08 mm. The tensile properties of the wood fiber paper were measured, and the results are shown in Table 3.

[0179] [Table 3]

[0180] When comparing the pressure effects during thickness shrinkage, select a wood grain raw material with the same specifications as in Example 1. The chemical treatment, lateral shrinkage, and thickness shrinkage are exactly the same as in Example 1. The only difference is that the surface pressure used during thickness shrinkage is selected as 0.02 MPa and compared with 6 MPa in Example 2. Moreover, to compare the thickness shrinkage effect under high pressure, select a single-direction wood grain with the same specifications. The chemical treatment and lateral shrinkage are the same as in Example 1, and a pressure greater than 18 MPa is used during thickness shrinkage. Then, use a vacuum pressure machine equipped with an exhaust passage to flatten the wood fiber paper. The flattening parameters are: the surface pressure is 0.2 MPa, the temperature is 110 °C, the flow rate of the vacuum pump is about 150 L / min, and it operates for 1 minute. The parameters of the single-direction wood fiber paper obtained in the above process are shown in Table 4 below.

[0181]

Table 4

[0182] Example 4

[0183] The chemical treatment is the same as in Example 1, the method of thickness shrinkage is the same, and the method of lateral shrinkage is the same as in Example 2. The difference is that first, thickness shrinkage is performed, and then lateral shrinkage is performed. For details, refer to the above description. When thickness shrinkage is performed first, wood fiber paper with excellent performance can be obtained. The results of the performance test are shown in Table 5.

[0184]

Table 5

[0185] The chemical treatments in Examples 5 to 9 are different from those in Example 1, and the other processes are the same.

[0186] Example 5

[0187] The reaction solution was prepared in advance, with a total volume of 20 L. The reactor was an upright chemical reaction vessel, allowing for chemical processing by directly attaching a unidirectional wooden surface to the vessel walls. When sodium hydroxide and sodium sulfite were dissolved in water, the concentration of sodium hydroxide in the reaction solution was 100 g / L, the concentration of sodium sulfite was 50 g / L, and the pH value of the reaction solution was 14. Subsequently, 0.29 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is subjected to high pressure. After maintaining the target temperature and pressure for 6 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with partially removed material is removed, and the unidirectional wood grain with partially removed material is washed with water to complete the chemical modification. As a result, the weight of the unidirectional wood grain with partially removed material is reduced by 42.0%.

[0188] Example 6

[0189] The reaction solution is prepared in advance, with a total volume of 100 L. The reactor is an upright chemical reaction vessel (connected to an external circulation pump), and the raw material frame of the upright chemical reaction vessel provided in this invention is placed on a unidirectional wooden surface for chemical treatment. When sodium hydroxide and sodium sulfite are dissolved in water, the concentration of sodium hydroxide in the reaction solution is 100 g / L, the concentration of sodium sulfite is 50 g / L, and the pH value of the reaction solution is 14. Subsequently, 0.12 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is subjected to high pressure. After maintaining the target temperature and pressure for 4 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with the partially removed material is removed, and the unidirectional wood grain with the partially removed material is washed with water to complete the chemical modification. As a result, the weight of the unidirectional wood grain with the partially removed material is reduced by 46.8%.

[0190] Example 7

[0191] The reaction solution is prepared in advance, with a total volume of 100 L. The reactor is an upright chemical reaction vessel (connected to an external circulation pump), and the raw material frame of the upright chemical reaction vessel provided in this invention is placed on a unidirectional wooden surface for chemical treatment. When sodium hydroxide and sodium sulfite are dissolved in water, the concentration of sodium hydroxide in the reaction solution is 100 g / L, the concentration of sodium sulfite is 50 g / L, and the pH value of the reaction solution is 14. Subsequently, 0.12 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is subjected to high pressure. After maintaining the target temperature and pressure for 5 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with partially removed material is removed, and the unidirectional wood grain with partially removed material is washed with water to complete the chemical modification. As a result, the weight of the unidirectional wood grain with partially removed material is reduced by 49.1%.

[0192] Example 8

[0193] The reaction solution is prepared in advance, with a total volume of 3 tons. The reactor is an upright chemical reaction vessel (connected to an external circulation pump), and the raw material frame of the upright chemical reaction vessel provided in this invention is placed on a unidirectional wooden surface for chemical treatment. When sodium hydroxide and sodium sulfite are dissolved in water, the concentration of sodium hydroxide in the reaction solution is 100 g / L, the concentration of sodium sulfite is 50 g / L, and the pH value of the reaction solution is 14. Subsequently, 0.25 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is subjected to high pressure. After maintaining the target temperature and pressure for 5 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with the partially removed material is removed, and the unidirectional wood grain with the partially removed material is washed with water to complete the chemical modification. As a result, the weight of the unidirectional wood grain with the partially removed material is reduced by 49.0%.

[0194] Example 9

[0195] The reaction solution is prepared in advance, with a total volume of 3 tons. The reactor is a horizontal chemical reaction vessel (connected to an external circulation pump), and the raw material frame of the horizontal chemical reaction vessel provided in this invention is placed on a unidirectional wooden surface for chemical treatment. When sodium hydroxide and sodium sulfite are dissolved in water, the concentration of sodium hydroxide in the reaction solution is 100 g / L, the concentration of sodium sulfite is 50 g / L, and the pH value of the reaction solution is 14. Subsequently, 0.37 m 2 According to the raw material ratio of / L, the reaction solution and unidirectional linden wood grain with a thickness of 0.28 mm are placed in the reactor, the reactor is heated to 125°C, and the entire internal system is subjected to high pressure. After maintaining the target temperature and pressure for 5 hours, the internal system is cooled to room temperature and atmospheric pressure, the reactor is opened, the unidirectional wood grain with the partially removed material is removed, and the unidirectional wood grain with the partially removed material is washed with water to complete the chemical modification. As a result, the weight of the unidirectional wood grain with the partially removed material is reduced by 48.2%.

[0196] The unidirectional wood grain obtained in Examples 5 to 9, from which the partial material had been removed, was subjected to subsequent processing according to the method of Example 1 to obtain unidirectional wood fiber paper, and the tensile properties of the wood fiber paper in the fiber direction were measured. The results are shown in Table 6.

[0197] [Table 6]

[0198] Example 10

[0199] The method for manufacturing unidirectional wood fiber paper specifically includes the following steps.

[0200] With a thickness of 0.25 mm, the surface density is 102 g / m². 2Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 10% is prepared and placed in a 30L chemical reaction vessel. Chemical treatment is carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 5 hours, resulting in a unidirectional wood texture with a weight reduction rate of 43% from which some material has been removed.

[0201] The washed, partially removed unidirectional wood grain is placed in a drying box and dried at 100°C for 30 minutes. Then, the unidirectional wood grain is immersed in water for 5 minutes and then placed in a drying box and dried at 100°C for 30 minutes. This immersion and drying process is repeated three times to achieve self-densification of the partially removed unidirectional wood grain. Finally, the re-watered wood grain is densified using a cold press under conditions of a surface pressure of 6 MPa and a compression time of 1 minute.

[0202] The dense wood surface is flattened with 75% alcohol, then placed on a vacuum forming machine. The wood surface is heated to 120°C, and a constant negative pressure (flow rate approximately 150 L / min) is applied to it to remove any remaining moisture, resulting in a surface density of 66 g / m². 2 Obtain a unidirectional wood fiber paper.

[0203] Example 11

[0204] The manufacturing method for composite wood fiber paper specifically includes the following steps.

[0205] With a thickness of 0.25 mm, the surface density is 102 g / m². 2 Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 11% is prepared and placed in a 100L chemical reaction vessel. Chemical treatment is then carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 6 hours, resulting in a unidirectional wood texture with a weight reduction rate of 47% from the removal of certain substances.

[0206] The washed, partially removed unidirectional wood grain is placed in a drying box and dried at 100°C for 30 minutes. Then, the unidirectional wood grain is immersed in water for 5 minutes and then placed in a drying box and dried at 100°C for 30 minutes. The immersion and drying process is repeated twice to achieve self-densification of the partially removed unidirectional wood grain. Finally, the re-watered wood grain is densified using a cold press under conditions of a surface pressure of 10 MPa for a compression time of 30 seconds.

[0207] The dense wood grain is immersed in an aqueous PU solution with a solid content of 6.8% for 3 minutes, then removed, flattened, and heated at 100°C. A constant negative pressure (flow rate of approximately 150 L / min) is applied to the dense wood grain to expel any remaining moisture, thereby obtaining composite wood fiber paper. (The moisture content of the composite wood fiber paper decreases to 9%, and the surface density is 68 g / m².) 2 (That is.)

[0208] Example 12

[0209] The manufacturing method for composite wood fiber paper specifically includes the following steps.

[0210] With a thickness of 0.25 mm, the surface density is 102 g / m². 2 Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 9.5% is prepared and placed in a 3-ton chemical reaction vessel. Chemical treatment is carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 6 hours, resulting in a unidirectional wood texture with a weight reduction rate of 43% from which some material has been removed.

[0211] After cleaning and removing any partially removed material, the unidirectional wood grain is left at room temperature and subjected to densification and watering twice. The unidirectional wood grain, stacked in 5 layers, is then sent to a continuous hot extrusion roll at 130°C each time. The thickness of the wood grain is gradually reduced with each pass through the hot extrusion roll. After being extruded through the hot extrusion roll 5 times, the process of densifying the unidirectional wood grain, from which the partially removed material has been removed, is completed.

[0212] The dense wood grain is immersed in an aqueous PU solution with a solid content of 11.7% for 3 minutes, then removed and exposed for 30 minutes. The temperature of the hot extrusion roll set is adjusted to 120°C, and the dense wood grain immersed in the PU solution is passed through the hot extrusion roll set three times to obtain composite wood fiber paper (the moisture content of the composite wood fiber paper decreases to 9%, and the surface density is 80 g / m²). 2 (That is.)

[0213] Example 13

[0214] The manufacturing method for composite wood fiber paper specifically includes the following steps.

[0215] With a thickness of 0.25 mm, the surface density is 102 g / m². 2 Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 9% is prepared and placed in a 100L chemical reaction vessel. Chemical treatment is then carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 4 hours to obtain a unidirectional wood texture with a weight reduction rate of 40% from partially removed material.

[0216] After cleaning and removing any partially removed material, the unidirectional wood grain is left at room temperature and subjected to densification and watering three times. Then, 20 layers of unidirectional wood grain are placed on a flattening machine each time, the temperature is raised to 100°C, and thermal extrusion is performed at a surface pressure of 12 MPa for a thermal extrusion time of 3 minutes according to the method. Finally, some of the moisture is squeezed out and some is released into the air, and the above process is repeated three times to complete the densification.

[0217] The dense wood grain is immersed in an aqueous PU solution with a solid content of 22% for 5 minutes, then removed and exposed for 30 minutes. The temperature of the hot extrusion roll set is adjusted to 120°C, and the dense wood grain is passed through the hot extrusion roll set three times to obtain composite wood fiber paper. (The moisture content of the composite wood fiber paper decreases to 9%, and the surface density is 115 g / m².) 2 (That is.)

[0218] Example 14

[0219] The manufacturing method for composite wood fiber paper specifically includes the following steps.

[0220] With a thickness of 0.25 mm, the surface density is 102 g / m². 2 Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 11% is prepared and placed in a 100L chemical reaction vessel. Chemical treatment is then carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 4 hours, resulting in a unidirectional wood texture with a weight reduction rate of 47% from the removal of certain substances.

[0221] After cleaning and removing any partially removed material, the unidirectional wood grain is left at room temperature for two densification and watering processes. Then, 20 layers of unidirectional wood grain are placed on a flattening machine each time, and cold pressing is performed at a surface pressure of 10 MPa for a hot pressing time of 3 minutes, completing the densification process. An aqueous solution of PU prepolymer with a solid content of 6.8% is uniformly sprayed onto both sides of the dense wood surface, and then coated using a coating method at a rate of 8 g / m². 2 A carbon fiber surface felt is coated onto both sides of a dense wood surface, then passed through an 80°C drying passage and a pair of 120°C hot extrusion rolls. After being extruded 2-3 times by the hot extrusion rolls, composite wood fiber paper is obtained (surface density is 78 g / m²). 2 (That is.)

[0222] Example 15

[0223] The manufacturing method for composite wood fiber paper specifically includes the following steps.

[0224] With a thickness of 0.25 mm, the surface density is 102 g / m². 2 Using the texture of linden wood, a chemical treatment solution consisting of sodium hydroxide / sodium sulfite in a 2:1 ratio with an alkaline substance concentration of 9% is prepared and placed in a 500L chemical reaction vessel. Chemical treatment is then carried out according to the construction conditions of a reaction temperature of 125°C and a reaction time of 6 hours, resulting in a unidirectional wood texture with a weight reduction rate of 47% from which some material has been removed. After cleaning and removing any partially removed material, the unidirectional wood grain is left at room temperature for two densification and watering processes. Then, 20 layers of unidirectional wood grain are placed on a flattening machine each time, and cold pressing is performed at a surface pressure of 10 MPa for a hot pressing time of 3 minutes, completing the densification process. An aqueous solution of PU prepolymer, with a solid content of 11.7%, is uniformly sprayed onto both sides of the dense wood surface, and then coated using a coating method at a rate of 10 g / m². 2 The glass fiber surface felt is coated onto both sides of the dense wood surface, then passed through an 80°C drying passage and a pair of 120°C hot extrusion rolls. After being extruded 2-3 times by the hot extrusion rolls, composite wood fiber paper is obtained (surface density is 84 g / m²). 2 (That is.) The performance test results for the wood fiber paper and composite wood fiber paper prepared according to the methods of the examples are shown in Table 7.

[0225] [Table 7]

[0226] Manufacturing of wooden honeycomb materials:

[0227] Experimental Example 16

[0228] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0229] Using PO adhesive as the core material adhesive, the core material adhesive is applied to the unidirectional wood fiber paper prepared in Experimental Example 10 by means of a roll-to-transfer method. The unidirectional wood fiber paper is then stacked alternately to create a honeycomb layered board, and the ear-shaped bands are adhered to it.

[0230] Place the honeycomb layer board in a drying box, add a weight of less than 10 kg, and bond it at 90°C for 5 minutes. After completion, trim off any excess adhesive from the edges. The orientation of the wood fibers is perpendicular to the height of the honeycomb structure.

[0231] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 200 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a regular hexagon shape.

[0232] The honeycomb material and frame are placed in a drying box and cured at 80°C for 60 minutes. The prepared honeycomb material is then finished and the manufacturing process is complete. The honeycomb structure has a side length of 5.5 mm, a size of 500 x 500 x 300 mm, and a density of 56 kg / m³. 3 That is the case.

[0233] Experimental Example 17

[0234] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0235] Using PO adhesive as the core material adhesive, the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0236] Place the honeycomb layer board in a drying box, add a weight, and bond it at 90°C for 5 minutes. After completion, trim off any excess glue from the edges. The orientation of the wood fibers is perpendicular to the height of the honeycomb structure.

[0237] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 200 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a regular hexagon shape.

[0238] Place the honeycomb material and frame together in a drying box and cure at 80°C for 60 minutes.

[0239] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 500 x 500 x 300 mm, and a density of 128 kg / m³. 3 That is the case.

[0240] Experimental Example 18

[0241] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0242] Using PO adhesive as the core material adhesive, the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0243] Place the honeycomb layer board in a drying box, add a weight, and bond it at 90°C for 5 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0244] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 200 mm, the prepared unsaturated polyester resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of polyester resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0245] Place the honeycomb material and frame together in a drying box and cure at 80°C for 60 minutes.

[0246] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 500 x 500 x 300 mm, and a density of 48 kg / m³. 3 That is the case.

[0247] Experimental Example 19

[0248] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0249] Using PO adhesive as the core material adhesive, the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0250] Place the honeycomb layer board in a drying box, add a weight, and bond it at 90°C for 5 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0251] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 500 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0252] Place the honeycomb material and frame together in a drying box and cure at 80°C for 60 minutes.

[0253] The process is completed by slimming down the prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 1000 x 1000 x 1000 mm, and a density of 56 kg / m³. 3 That is the case.

[0254] Experimental Example 20

[0255] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0256] PA adhesive was used as the core material adhesive, and the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0257] Place the honeycomb layer board in a drying box, add a weight, and bond it at 120°C for 10 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0258] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 500 mm, the prepared acrylic resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of acrylic resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0259] Place the honeycomb material and frame together in a drying box and cure at 60°C for 90 minutes.

[0260] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 1000 x 1000 x 500 mm, and a density of 64 kg / m³. 3 That is the case.

[0261] Experimental Example 21

[0262] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0263] Using PO adhesive as the core material adhesive, the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0264] Place the honeycomb layer board in a drying box, add a weight, and bond it at 90°C for 10 minutes. After completion, trim off any excess adhesive from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0265] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 700 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0266] Place the honeycomb material and frame together in a drying box and cure at 80°C for 60 minutes.

[0267] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 1200 x 2200 x 300 mm, and a density of 64 kg / m³. 3 That is the case.

[0268] Experimental Example 22

[0269] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0270] PA adhesive was used as the core material adhesive, and the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0271] Place the honeycomb layer board in a drying box, add a weight, and bond it at 120°C for 10 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0272] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 700 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0273] Place the honeycomb material and frame together in a drying box and cure at 80°C for 60 minutes.

[0274] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 1200 x 2200 x 300 mm, and a density of 64 kg / m³. 3 That is the case.

[0275] Experimental Example 23

[0276] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0277] Using PO adhesive as the core material adhesive, the core material adhesive was transferred to the unidirectional wood fiber paper (surface density 66 g / m²) prepared in Experimental Example 10 by means of a roll-to-transfer method. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0278] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 10 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0279] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered board is slowly stretched to a length of 700 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0280] Place the honeycomb material and frame together in a drying box and cure at 80°C for 120 minutes.

[0281] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 1300 x 2600 x 400 mm, and a density of 128 kg / m³. 3 That is the case.

[0282] Experimental Example 24

[0283] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0284] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the unidirectional wood fiber paper prepared in Experimental Example 10 (surface density: 66 g / m²) via silkscreen printing. 2 The material is applied to the surface, and the unidirectional wood fiber paper is stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are adhered.

[0285] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0286] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 400 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0287] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0288] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 1000 x 2000 x 300 mm, and a density of 64 kg / m³. 3 That is the case.

[0289] Experimental Example 25

[0290] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0291] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper prepared in Experimental Example 11 (surface density: 68 g / m²) via silkscreen printing. 2 The composite wood fiber paper is applied to the surface, and the layers are stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are then attached.

[0292] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0293] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 300 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0294] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0295] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 500 x 500 x 300 mm, and a density of 48 kg / m³. 3 That is the case.

[0296] Experimental Example 26

[0297] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0298] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper prepared in Experimental Example 11 (surface density: 68 g / m²) via silkscreen printing. 2 The composite wood fiber paper is applied to the surface, and the layers are stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are then attached.

[0299] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 150 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0300] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 600 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0301] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0302] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 1000 x 1000 x 300 mm, and a density of 80 kg / m³. 3 That is the case.

[0303] Experimental Example 27

[0304] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0305] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 80 g / m²) prepared in Experimental Example 12 by silkscreen printing. 2 The composite wood fiber paper is applied to the surface, and the layers are stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are then attached.

[0306] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 180 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0307] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 400 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0308] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0309] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 1200 x 1200 x 600 mm, and a density of 64 kg / m³. 3 That is the case.

[0310] Experimental Example 28

[0311] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0312] Using acrylic resin as the core material adhesive, the core material adhesive was transferred to the composite wood fiber paper (surface density 115 g / m²) prepared in Experimental Example 13 by means of a flat plate transfer method. 2 The composite wood fiber paper is applied to the surface, and the layers are stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are then attached.

[0313] Place the honeycomb layer board in a drying box, add a weight, and bond it at 60°C for 20 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0314] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 200 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated three times with reduced pressure, thereby uniformly coating the void walls of the honeycomb structure with a quantitative amount of epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0315] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0316] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 5.5 mm, a size of 500 x 500 x 400 mm, and a density of 72 kg / m³. 3 That is the case.

[0317] Experimental Example 29

[0318] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0319] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 78 g / m²) prepared in Experimental Example 14 by silkscreen printing. 2 The material is applied to the composite wood fiber paper, and the carbon fiber felt combines with the composite wood fiber paper to form a surface coating layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0320] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0321] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 600 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a regular hexagon shape.

[0322] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0323] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 1200 x 1200 x 800 mm, and a density of 64 kg / m³. 3 That is the case.

[0324] Experimental Example 30

[0325] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0326] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 78 g / m²) prepared in Experimental Example 14 by silkscreen printing. 2 The material is applied to the composite wood fiber paper, and the carbon fiber felt combines with the composite wood fiber paper to form a surface coating layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0327] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 90 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0328] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 300 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a regular hexagon shape.

[0329] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0330] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 500 x 500 x 600 mm, and a density of 72 kg / m³. 3 That is the case.

[0331] Experimental Example 31

[0332] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0333] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 78 g / m²) prepared in Experimental Example 14 by silkscreen printing. 2 The material is applied to the composite wood fiber paper, and the carbon fiber felt combines with the composite wood fiber paper to form a surface coating layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0334] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 80 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0335] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 300 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a regular hexagon shape.

[0336] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0337] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 500 x 500 x 500 mm, and a density of 80 kg / m³. 3 That is the case.

[0338] Experimental Example 32

[0339] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0340] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 84 g / m²) prepared in Experimental Example 15 by silkscreen printing. 2 The material is applied to the surface, and the crow fiber felt combines with the composite wood fiber paper to form a coating surface layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0341] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0342] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 400 mm, the prepared epoxy resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with epoxy resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0343] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 80°C for 30 minutes.

[0344] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 4 mm, a size of 600 x 600 x 600 mm, and a density of 64 kg / m³. 3 That is the case.

[0345] Experimental Example 33

[0346] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0347] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 78 g / m²) prepared in Experimental Example 14 by silkscreen printing. 2 The material is applied to the composite wood fiber paper, and the carbon fiber felt combines with the composite wood fiber paper to form a surface coating layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0348] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0349] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 600 mm, the prepared phenolic resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is operated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with quantitative phenolic resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0350] The honeycomb material and frame are placed together in a drying box and first cured at 60°C for 30 minutes, and then cured at 100°C for 30 minutes.

[0351] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 3.67 mm, a size of 1000 x 1000 x 500 mm, and a density of 64 kg / m³. 3 That is the case.

[0352] Experimental Example 34

[0353] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0354] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper (surface density 84 g / m²) prepared in Experimental Example 15 by silkscreen printing. 2 The material is applied to the surface, and the crow fiber felt combines with the composite wood fiber paper to form a coating surface layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0355] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0356] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine, then the honeycomb layered plate is slowly stretched to a length of 1200 mm, the prepared phenolic resin is uniformly poured into the voids of the honeycomb structure, the tensioning machine is activated in the return stroke, the extrusion device is activated, and the stretching and extrusion operations are repeated twice with reduced pressure to uniformly coat the void walls of the honeycomb structure with quantitative phenolic resin, and then the voids of the honeycomb structure are stretched into a shape conforming to a regular hexagon.

[0357] The honeycomb material and frame are placed together in a drying box and cured first at 60°C for 30 minutes, then at 80°C for 30 minutes, and finally at 100°C for 30 minutes.

[0358] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 3.67 mm, a size of 1200 x 2400 x 500 mm, and a density of 72 kg / m³. 3 That is the case.

[0359] Experimental Example 35

[0360] The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0361] Using epoxy adhesive as the core material adhesive, the core material adhesive was applied to the composite wood fiber paper prepared in Experimental Example 11 (surface density: 68 g / m²) via silkscreen printing. 2 The composite wood fiber paper is applied to the surface, and the layers are stacked alternately to form a honeycomb layered board, to which the ear-shaped bands are then attached.

[0362] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0363] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine. The honeycomb layer plate is then slowly stretched to a length of 300 mm. The prepared phenolic resin is uniformly poured into the voids of the honeycomb structure. The tensioning machine then operates in its return stroke, and the extrusion device is activated. By reducing the pressure output and repeating the stretching and extrusion operations twice, the quantitative phenolic resin is uniformly applied to the void walls of the honeycomb structure, and then the voids of the honeycomb structure are stretched into a regular hexagonal shape.

[0364] The honeycomb material and frame are placed together in a drying box and cured first at 60°C for 30 minutes, then at 80°C for 30 minutes, and finally at 100°C for 30 minutes.

[0365] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 2.75 mm, a size of 500 x 500 x 400 mm, and a density of 48 kg / m³. 3 That is the case.

[0366] Experimental Example 36 The manufacturing method for wooden honeycomb material specifically includes the following steps.

[0367] Using epoxy adhesive as the core material adhesive, and silkscreen printing as the means, composite wood fiber paper (surface density 78 g / m²) 2 The material is applied to the composite wood fiber paper, and the carbon fiber felt combines with the composite wood fiber paper to form a surface coating layer. The composite wood fiber paper is then stacked alternately to create a honeycomb layered board, to which the ear-shaped bands are adhered.

[0368] Place the honeycomb layer board in a drying box, add a weight, and bond it at 80°C for 120 minutes. After completion, trim off any excess glue from the edges. The wood fibers are oriented parallel to the height of the honeycomb structure.

[0369] The contact pins are passed through the ear-shaped bands and fixed to the tensioning machine. Next, the honeycomb layered plate is slowly stretched to a length of 500 mm. The prepared phenolic resin is then uniformly poured into the voids of the honeycomb structure. The tensioning machine then operates in the return stroke, and the extrusion device is activated. By reducing the pressure output and repeating the stretching and extrusion operations twice, the quantitative phenolic resin is uniformly applied to the void walls of the honeycomb structure, and then the voids of the honeycomb structure are stretched into a regular hexagonal shape.

[0370] The honeycomb material and frame are placed together in a drying box and cured first at 60°C for 30 minutes, then at 80°C for 30 minutes, and finally at 100°C for 30 minutes.

[0371] The process is completed by slimming down the pre-prepared honeycomb material. The honeycomb structure has a side length of 2.75 mm, a size of 1000 x 1000 x 800 mm, and a density of 64 kg / m³. 3 The honeycomb material produced in the above embodiment is cut to a thickness of 15 mm, and its compressive strength is measured.

[0372] The compressive strength of the honeycomb material prepared in the examples was measured according to (GB / T 12914-2008), and the results are shown in Table 8.

[0373] [Table 8]

[0374] The specific embodiments described above further illustrate the objectives, technical means, and beneficial effects of the present invention, and it should be understood that the above is merely a specific embodiment of the present invention and is not intended to limit the invention. Any modifications, substitutions of equivalents, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the present invention.

Claims

1. The material comprises a wooden honeycomb material and a first resin adhering to the surface of the wooden honeycomb material, wherein the wooden honeycomb material comprises a plurality of wood fiber paper and a core material adhesive, and the plurality of wood fiber paper are bonded together with the core material adhesive; The plurality of composite wood fiber papers include unidirectional wood fiber paper and / or composite wood fiber paper, and the composite wood fiber paper includes unidirectional wood fiber paper and a second resin layer and / or fiber reinforcing layer attached to the surface of the unidirectional wood fiber paper; Density: 29–144 kg / m³ ３ And; The compressive strength is 0.4 to 13.8 MPa. A wooden honeycomb material characterized by the following.

2. The wood fiber paper comprises wood fibers and / or bundles of wood fibers; the wood fibers and / or bundles of wood fibers are arranged or stretched microscopically along one direction as a whole. The wooden honeycomb material according to feature 1.

3. The tensile strength of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 6 to 30 kN / m; and / or The tensile strength of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.3 to 4 kN / m; and / or The elastic modulus of the wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 8 to 80 GPa; and / or The elastic modulus of the wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.4 to 3 GPa. The wooden honeycomb material according to feature 2.

4. The aforementioned unidirectional wood fiber paper is formed by the shrinkage of a unidirectional wood grain, from which some material has been removed, along at least one direction. The aforementioned partial material comprises woody material and semifiber; The wooden honeycomb material according to claim 1, characterized in that the shrinkage, in accordance with the decomposition of forces, includes lateral shrinkage and thickness shrinkage.

5. The unidirectional wood grain from which the partial material has been removed shrinks along at least two directions; The aforementioned shrinkage includes lateral shrinkage and thickness shrinkage; The directions of the contraction forces of the aforementioned lateral contraction and the aforementioned thickness contraction intersect; The aforementioned lateral contraction force is a force in the horizontal direction of the wood grain, and a force that intersects in plane with the extension direction of the wood fibers and / or bundles of wood fibers; and / or, The shrinkage force of the aforementioned thickness reduction is a force in the direction perpendicular to the wood grain in a single direction; The force in the horizontal direction and the force in the vertical direction are forces that are initially applied independently, and / or forces that are formed after the combination or decomposition of forces. The wooden honeycomb material according to feature 4.

6. The thickness of the unidirectional wood fiber paper is 0.2 mm or less; and / or The surface density of the aforementioned unidirectional wood fiber paper is 20 to 200 g / m². ２ The tensile strength of the unidirectional wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the wood fiber bundle is 150 to 1000 MPa. The wooden honeycomb material according to feature 5.

7. Under the application of a surface pressure of 0.005 MPa or less, the apparent thickness of the unidirectional wood fiber paper shall not exceed four times the average thickness of the unidirectional wood fiber paper; and / or The weight reduction rate of the unidirectional wood grain after removing a portion of the material is 10% to 60%; and / or the lateral shrinkage rate is 2% to 40%, and the thickness shrinkage rate is 20% to 90%. The wooden honeycomb material according to feature 4.

8. The weight of the second resin layer is 0% to 30% of the weight of the composite wood fiber paper; the weight of the fiber reinforcement layer is 0% to 10% of the weight of the composite wood fiber paper. The wooden honeycomb material according to feature 1.

9. The second resin layer is a thermosetting resin and / or a thermoplastic resin; and / or The surface density of the fiber-reinforced layer is 1 to 20 g / m² ２ That is, The wooden honeycomb material according to feature 8.

10. The thermosetting resin is selected from one or more of epoxy resins, unsaturated polyester resins, polyphthalicone resins, phenolic resins, melamine resins, and crosslinkable polyurethane resins; and / or the thermoplastic resin is selected from one or more of polyamites, polylactic acid, polyurethanes, ethylene-phenyl acetate copolymers, ethylene-acrylic acid ester copolymers, and copolyesters; and / or The fiber-reinforced layer is a low-density fiber surface felt, and the low-density fiber surface felt is selected from one or more of carbon fiber surface felt, crow fiber surface felt, and aramid fiber surface felt. The wooden honeycomb material according to feature 9.

11. The surface density of the composite wood fiber paper is 3 to 50 g / m² higher than that of the unidirectional wood fiber paper. ２ The wooden honeycomb material according to claim 1, characterized by its ability to rise.

12. The weight of the wood fiber paper is 30% to 84% of the weight of the wooden honeycomb material; and / or The weight of the first resin is 15% to 69% of the weight of the wooden honeycomb material; and / or the weight of the core material adhesive is 1% to 30% of the weight of the wooden honeycomb material. The wooden honeycomb material according to feature 1.

13. S1) Multiple sheets of wood fiber paper coated with core material adhesive are stacked alternately, heat-compressed and hardened to obtain a honeycomb layered mass; S2) The honeycomb layered mass is stretched to obtain a wooden honeycomb material; S3) The first resin is transferred onto a wooden honeycomb material, hardened and shaped to obtain a wooden honeycomb material; Multiple sheets of wood fiber paper include unidirectional wood fiber paper and / or composite wood fiber paper; the composite wood fiber paper includes unidirectional wood fiber paper and a second resin layer and / or fiber reinforcement layer attached to the surface of the unidirectional wood fiber paper; The density of the aforementioned wooden honeycomb material is 29 to 144 kg / m³ ３ And; The compressive strength of the aforementioned wooden honeycomb material is 0.4 to 13.8 MPa. A method for manufacturing a wooden honeycomb material, characterized by the following:

14. A1) Chemically modifying a unidirectional wood grain to obtain a unidirectional wood grain from which partial substances have been removed; A2) The unidirectional wood grain from which the partial material has been removed shrinks along at least one direction, thereby obtaining unidirectional wood fiber paper. According to the decomposition of the force, the contraction includes lateral contraction and thickness contraction. The manufacturing method according to claim 13, characterized in that it

15. The thickness of the unidirectional wood grain is 0.05 to 0.6 mm; and / or A1) The chemical modification is carried out in a sealed high-pressure system; the target temperature for the chemical modification is 100 to 150°C, the target surface pressure for the chemical modification is 0.07 to 1.9 MPa; the duration of the chemical modification under the action of the target temperature / target surface pressure is 1 to 12 hours; or The chemical modification is performed under normal pressure, the duration of the chemical modification is 24 to 72 hours under the action of the target temperature / target surface pressure, and the temperature of the chemical modification is the boiling point of water under normal pressure; and / or A1) The chemical modifier in the chemical modification includes an alkaline substance, a sulfonating agent, and water; The pH value of the chemical modifier is 12 to 14; The concentration of the alkaline substance in the chemical modifier is 0.01 to 5 kg / L; the alkaline substance is selected from one or more of sodium hydroxide, potassium hydroxide, sodium bicarbonate, and potassium bicarbonate; The concentration of the sulfonating agent is 0.01 to 5 kg / L; The sulfonating agent in the chemical modifier is selected from one or more of sulfites, chlorsulfonic acid, hydroxymethylsulfonate, sulfuryl chloride, and sulfamic acid; and / or The ratio of the unidirectional wood grain to the chemical modifier is 4.6 to 184 cm. ３ : 1L The manufacturing method according to claim 14.

16. The shrinkage process includes a lateral shrinkage process and a thickness shrinkage process; the force of the lateral shrinkage process intersects with the force of the thickness shrinkage process. The manufacturing method according to claim 14.

17. The aforementioned lateral shrinkage treatment is shrinkage due to external mechanical force applied in the lateral direction and / or spontaneous shrinkage due to dehydration; The external mechanical force applied in the lateral direction intersects in plane with the extension direction of the wood fibers and / or fiber bundles of the unidirectional wood grain, from which the partial material has been removed. The manufacturing method according to claim 16.

18. The external mechanical force applied laterally is the pressure applied to a film material that has undergone lateral contraction, attached to a unidirectional wood surface from which some material has been removed; and / or Negative pressure applied to a unidirectional wood surface from which partial material has been removed; and / or The pressure applied when rolling over a unidirectional wood surface from which some material has been removed; and / or This is the pressure applied laterally to a unidirectional wood grain from which some material has been removed. The manufacturing method according to claim 17, characterized by the features described above.

19. The surface pressure of the external mechanical force applied in the lateral direction is 0.001 to 1.5 MPa; and / or The temperature of the lateral shrinkage treatment is 15°C to 150°C; and / or The time for the aforementioned lateral contraction process is 1 s to 4 min; and / or The intensity of the negative pressure is 1 atmosphere or less. The manufacturing method according to claim 17, characterized by the features described above.

20. The aforementioned thickness reduction treatment involves applying mechanical pressure in the thickness direction; The surface pressure of the mechanical pressure applied in the thickness direction is 0.01 to 80 MPa; and / or The time for the aforementioned thickness reduction treatment is 0.1 to 4 min; and / or The temperature of the thickness shrinkage treatment is 15 to 150°C. The manufacturing method according to claim 16.

21. The thickness reduction is performed on a single sheet or in a stacked state; the number of stacked layers is 2 to 20 sheets; and the surface pressure of the thickness reduction treatment in the stacked state is 0.1 to 60 MPa. The manufacturing method according to claim 16.

22. The shrinkage rate of the lateral shrinkage is 2% to 40%; the shrinkage rate of the thickness shrinkage is 20% to 90%. The manufacturing method according to claim 14.

23. The thickness reduction treatment includes a hot press treatment under negative pressure conditions; The surface pressure of the aforementioned hot-pressure treatment is 0.1 to 60 MPa; and / or The temperature of the aforementioned heat and pressure treatment is 50°C to 150°C; and / or The duration of the aforementioned heat and pressure treatment is 0.5 to 20 minutes. The manufacturing method according to claim 16.

24. After the shrinkage treatment, a planarization treatment is performed; the planarization treatment is performed by performing planar thermal compression in a negative pressure extraction environment. The manufacturing method according to claim 16.

25. When performing the planarization process, an exhaust passage is provided on the double contact surface or single contact surface of the unidirectional wood fiber paper. The manufacturing method according to claim 24, characterized by the above.

26. The surface pressure of the aforementioned planar thermal compression is 0.01 to 2 MPa; and / or The time for the planarization process is 0.1 to 4 min; and / or The temperature of the planarization process is 40°C to 150°C. The manufacturing method according to claim 24, characterized by the above.

27. The planarization process is selected from one or more of the following: vacuum forming and negative pressure thermal compression; and / or The moisture content of the aforementioned unidirectional wood fiber paper is less than 10%. The manufacturing method according to claim 24, characterized by the above.

28. The composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer adhering to the surface of the unidirectional wood fiber paper; the method for producing the composite wood fiber paper comprises transferring a diluted second resin raw material to the surface of the unidirectional wood fiber paper, curing it, and then obtaining the composite wood fiber paper; The second resin raw material is selected from one or more of the monomer of the second resin, the prepolymer of the second resin, and the second resin. The manufacturing method according to claim 13, characterized in that it

29. The composite wood fiber paper comprises a unidirectional wood fiber paper and a second resin layer and a fiber reinforcing layer attached to the surface of the unidirectional wood fiber paper; The method for producing the composite wood fiber paper includes transferring a diluted second resin raw material to the surface of unidirectional wood fiber paper, then coating it with a fiber-reinforced layer, curing it, and then obtaining the composite wood fiber paper; The second resin raw material is selected from one or more of the monomer of the second resin, the prepolymer of the second resin, and the second resin. The manufacturing method according to claim 13, characterized in that it

30. In S3), the first resin is transferred onto the wooden honeycomb material multiple times, and the material is cured and shaped multiple times to obtain the wooden honeycomb material; the process of curing and shaping multiple times is performed between two transfers, and the last step performed is curing and shaping; the transfer method is selected from one or more of spraying, spraying, and coating. The manufacturing method according to claim 13, characterized in that it

31. The process of transferring the resin onto the wooden honeycomb material in S3) is performed according to the steps of: placing the first resin into the empty lattice of the wooden honeycomb material as a means of spraying, spraying, or coating; then stretching and pressing the wooden honeycomb material; and then uniformly applying the first resin to the wooden honeycomb material. The manufacturing method according to claim 13, characterized in that it

32. It comprises a unidirectional wood fiber paper and a second resin layer and / or fiber-reinforced layer attached to at least one surface of the unidirectional wood fiber paper; The tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 5% to 100% higher than that of the unidirectional wood fiber paper. The elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 5% to 100% higher than the tensile strength of the unidirectional wood fiber paper. A composite wood fiber paper characterized by the following features.

33. The aforementioned unidirectional wood fiber paper is formed by the shrinkage of a unidirectional wood grain, from which some material has been removed, along at least one direction. The aforementioned partial material comprises woody material and semifiber; Force decomposition, therefore the contraction includes lateral contraction and thickness contraction; The unidirectional wood fiber paper comprises wood fibers and / or bundles of wood fibers; the wood fibers and / or bundles of wood fibers are microscopically arranged or stretched along one direction as a whole; The tensile strength of the composite wood fiber paper in the direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 6 to 30 kN / m; and / or The tensile strength of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or wood fiber bundle is 0.7 to 4 kN / m; and / or The elastic modulus of the composite wood fiber paper in a direction parallel to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 8 to 80 GPa; and / or The elastic modulus of the composite wood fiber paper in the direction perpendicular to the longitudinal direction of the wood fibers and / or the bundle of wood fibers is 0.8 to 3 GPa. The composite wood fiber paper according to feature 32.

34. The weight of the second resin layer is 0% to 30% of the weight of the composite wood fiber paper; the weight of the fiber reinforcement layer is 0% to 10% of the weight of the composite wood fiber paper, and both are not zero at the same time. The composite wood fiber paper according to feature 32.

35. The second resin layer comprises a thermosetting resin and / or a thermoplastic resin; the thermosetting resin is selected from one or more of epoxy resins, unsaturated polyester resins, polyphthalic acid resins, phenolic resins, melamine resins, and crosslinkable polyurethane resins; the thermoplastic resin is selected from one or more of polyamite, polylactic acid, polyurethane, ethylene-phenyl acetate copolymer, ethylene-acrylic acid ester copolymer, and copolyester; The fiber-reinforced layer is a low-density fiber surface felt; the low-density fiber surface felt is selected from one or more of carbon fiber surface felt, crow fiber surface felt, and aramid fiber surface felt. The composite wood fiber paper according to feature 32.

36. The surface density of the composite wood fiber paper is 3 to 50 g / m² higher than that of the unidirectional wood fiber paper. ２ The composite wood fiber paper according to claim 32, characterized by its ability to rise.

37. An application of the wooden honeycomb material according to any one of claims 1 to 12, the wooden honeycomb material manufactured according to the manufacturing method according to any one of claims 13 to 31, or the composite wood fiber paper according to any one of claims 32 to 36 in one or more of building materials, furniture materials, sports equipment, support members, vehicles and aircraft.

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