Wood composite board with high surface quality

Abstract

The utility model discloses a high-surface-quality wood composite board which comprises a base board and a first single board covering the base board, the thickness of the first single board is D, D is larger than or equal to 0.1 mm and smaller than or equal to 0.5 mm, and a plurality of first glue pouring gullies which are arranged in a staggered mode are formed in the side, facing the base board, of the first single board. The base plate mainly plays a bearing role and is large in thickness, in the long-term use process, the influence of water content change or thermal expansion and cold contraction on the bearing capacity of the base plate is small, and a guarantee is provided for the structural strength of the composite board. The first veneer is arranged on the substrate, and the thickness D of the first veneer is only 0.1 mm-0. 5mm, so that when the first veneer is subjected to the moisture content change effect or the heat cold contraction effect, the first veneer does not generate large internal stress, the integrity of the outer surface of the first veneer is guaranteed, the first veneer is not prone to buckling deformation under the weak internal stress effect, and the service life of the first veneer is prolonged. And the completeness and attractiveness of the outer surface of the wood composite board are maintained.

Description

Technical Field

[0001] This application belongs to the field of panel structure technology, specifically relating to a high surface quality wood composite panel. Background Technology

[0002] Wooden outdoor flooring and wall panels have become the preferred paving materials for outdoor decoration due to their aesthetic appeal, impact mitigation, environmental friendliness, and durability, and are welcomed by decoration companies and homeowners. Currently, when choosing and purchasing outdoor wooden flooring and wall panels, consumers not only consider their appearance, color, and brand, but also have strict requirements for surface quality, demanding that the surface not crack or deform over long-term use.

[0003] Outdoor wooden flooring or wall panels on the market mainly include materials such as preservative-treated wood, carbonized wood, reconstituted bamboo, and reconstituted wood. Among them, preservative-treated wood and carbonized wood are usually made of whole pieces of solid wood with a large thickness. With long-term use, as the moisture content changes, due to the shrinkage and expansion characteristics of wood, cracks will appear on the surface, the surface quality will decline, and the appearance will be affected. The raw material of reconstituted bamboo flooring is bamboo. After the bamboo is loosened, it is impregnated with resin and pressed together. Compared with wood, it has a higher density, a denser material, and poorer permeability. Due to the large internal stress in the hot pressing process of bamboo, after long-term use, as the internal stress is released, the surface is also prone to cracks, deformation, warping, and other problems that lead to a decline in surface quality. Reconstituted wood is made by impregnating wood veneers with phenolic resin adhesive, assembling multiple layers, and hot pressing them together. Currently, the thickness of commonly used reconstituted wood veneers on the market is 1-3mm. Because reconstituted wood is made by assembling multiple layers of veneers and hot-pressing them together, its deformation during long-term use is reduced to a certain extent compared to solid wood. However, due to the thicker veneer, the small impregnation area and uneven impregnation can easily lead to uneven heat transfer during the hot-pressing process, resulting in inconsistent adhesive curing rates and internal stress. In the long term, problems such as surface cracks and warping may still occur. Utility Model Content

[0004] This application provides a high-surface-quality wood-based composite board to solve the technical problem that the outer surface of traditional board structures is prone to warping, deformation and cracking during long-term use.

[0005] The technical solution adopted in this application is as follows:

[0006] A high surface quality wood composite board includes a substrate and a first veneer covering the substrate. The thickness of the first veneer is D, where 0.1 mm ≤ D ≤ 0.5 mm. The first veneer has multiple staggered first glue-filling grooves on one side facing the substrate.

[0007] The high surface quality wood composite board described in this application also includes the following additional technical features:

[0008] The first glue-filling groove includes a first groove extending along the length of the first veneer and a second groove arranged at an angle to the first groove, wherein the angle between the first groove and the second groove is α, and 60°≤α≤90°.

[0009] Two adjacent first grooves and two adjacent second grooves together form a ring of grooves, with no more than 10 such rings per inch.

[0010] The first single board is assembled along the grain direction along the length of the board.

[0011] It also includes a second veneer covering the upper surface of the first veneer, wherein the first veneer has a plurality of staggered second glue-filling grooves on the side facing the second veneer, and the second veneer has a plurality of staggered third glue-filling grooves on the side facing the first veneer.

[0012] The first veneer is assembled along the length of the board in the direction of parallel grain, and the second veneer is assembled along the length of the board in the direction of transverse grain.

[0013] It also includes a third veneer covering the upper surface of the second veneer, wherein the second veneer has multiple staggered fourth glue-filling grooves on the side facing the third veneer, and the third veneer has multiple staggered fifth glue-filling grooves on the side facing the second veneer.

[0014] The third veneer is assembled along the grain direction along the length of the board.

[0015] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0016] The wood-based composite board of this application includes a substrate and a first veneer covering the outer surface of the substrate. The substrate mainly serves a load-bearing function and has a relatively large thickness. During long-term use, changes in moisture content or thermal expansion and contraction have little impact on its load-bearing capacity, thus ensuring the structural strength of the composite board. The first veneer is provided on the substrate. Since the thickness D of the first veneer is only 0.1mm-0.5mm, it will not generate large internal stress when subjected to changes in moisture content or thermal expansion and contraction. Therefore, the internal stress will not cause significant tension on the first veneer, ensuring the integrity of its outer surface. Furthermore, under weak internal stress, the first veneer will not easily warp or deform, maintaining the integrity and aesthetics of the wood composite board's outer surface. In addition, the first veneer thickness is 0.1mm-0.5mm. Compared to thicker veneers in traditional technologies, the first veneer in this application can be more uniformly impregnated with phenolic resin, reducing the probability of insufficient or uneven impregnation. This reduces the probability of uneven internal force distribution during hot-pressing curing due to uneven phenolic resin impregnation, thus lowering the likelihood of surface cracking. Moreover, during hot-pressing, the heat can be quickly and evenly transferred to the bonding interface between the first veneer and the substrate, allowing the adhesive bonding the first veneer and the substrate to cure evenly and rapidly. This avoids inconsistent curing speeds of the adhesive between the first veneer and the substrate due to uneven heat distribution, thereby preventing internal stress caused by inconsistent adhesive curing speeds.

[0017] Based on this, the present application further provides multiple staggered first potting grooves on the side of the first veneer facing the substrate, which increases the outer surface area of ​​the first veneer. When the first veneer is bonded to the substrate, the adhesive can enter each of the first potting grooves, increasing the bonding area between the first veneer and the substrate, thereby improving the structural strength of the composite board. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a schematic diagram of a wood-based composite board according to one embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the first single board according to one embodiment of this application;

[0021] Figure 3 This is a schematic diagram of a wood-based composite board according to another embodiment of this application;

[0022] Figure 4This is a schematic diagram of a wood-based composite board according to another embodiment of this application.

[0023] in:

[0024] 1 substrate;

[0025] 2 First veneer, 21 First glued groove, 211 First groove, 212 Second groove;

[0026] 3. Second board;

[0027] 4. The third board. Detailed Implementation

[0028] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0030] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0033] like Figure 1 , Figure 2 As shown, a high surface quality wood composite board includes a substrate 1 and a first veneer 2 covering the substrate 1. The thickness of the first veneer 2 is D, 0.1mm≤D≤0.5mm. The first veneer 2 has a plurality of staggered first glue-filling grooves 21 on the side facing the substrate 1.

[0034] The wood-based composite board of this application includes a substrate 1 and a first veneer 2 covering the outer surface of the substrate 1. The substrate 1 mainly serves a load-bearing function and has a relatively large thickness. During long-term use, changes in moisture content or thermal expansion and contraction have little impact on its load-bearing capacity, thus ensuring the structural strength of the composite board. The first veneer 2 is disposed on the substrate 1. Since the thickness D of the first veneer 2 is only 0.1mm-0.5mm, it will not generate large internal stress when subjected to changes in moisture content or thermal expansion and contraction. Therefore, the internal stress will not cause large tension on the first veneer 2, ensuring the integrity of the outer surface of the first veneer 2. Under the action of weak internal stress, the first veneer 2 will not easily warp or deform, maintaining the integrity and aesthetics of the outer surface of the wood-based composite board. In addition, the thickness of the first veneer 2 is 0.1mm-0.5mm. Compared with the thick veneers in traditional technology, the first veneer 2 in this application can be more uniformly impregnated with phenolic resin, reducing the probability of insufficient or uneven impregnation of the first veneer 2 by phenolic resin, thereby reducing the risk of damage caused by phenolic resin. Uneven resin impregnation leads to uneven internal force distribution during hot pressing and curing of the first veneer 2, increasing the probability of surface cracking. Furthermore, during hot pressing, the first veneer 2 allows for rapid and uniform heat transfer to the bonding interface between it and the substrate 1, ensuring uniform and rapid curing of the adhesive. This avoids inconsistent curing speeds of the adhesive between the veneer 2 and the substrate 1 caused by uneven heat distribution, thus preventing internal stress resulting from inconsistent adhesive curing speeds. In addition, this application provides multiple staggered first potting grooves 21 on the side of the first veneer 2 facing the substrate 1, increasing the surface area of ​​the first veneer 2. During bonding, the adhesive can penetrate into each of the first potting grooves 21, increasing the bonding area between the veneer 2 and the substrate 1, thereby improving the structural strength of the composite material.

[0035] As a preferred embodiment of this application, such as Figure 2 As shown, the first glue-filling groove 21 includes a first groove 211 extending along the length direction of the first veneer 2 and a second groove 212 arranged at an angle to the first groove 211. The angle between the first groove 211 and the second groove 212 is α, 60°≤α≤90°.

[0036] The first groove 211 and the second groove 212 are arranged at an angle, which further enhances the bonding strength between the first veneer 2 and the substrate 1, and helps to improve the structural strength of the composite board after molding. At the same time, this arrangement also facilitates the processing of the first veneer 2. By covering the first veneer 2 with a crisscrossing steel mesh and applying a certain pressure to the steel mesh, the first veneer 2 with the first groove 211 and the second groove 212 can be formed. The relative angle and size of the first groove 211 and the second groove 212 are related to the arrangement and size of the steel wires of the steel mesh.

[0037] Preferably, such as Figure 2 As shown, two adjacent first grooves 211 and two adjacent second grooves 212 together form a surrounding groove ring, and the number of groove rings per inch is no more than 10.

[0038] Setting the number of groove rings to no more than ten per inch ensures sufficient connection strength between the first veneer 2 and the substrate 1, without excessively damaging the structural strength of the first veneer 2, thus helping to enhance the service life of the composite board.

[0039] In a preferred embodiment of this application, the first single board 2 is assembled along the grain direction along the length of the board.

[0040] When the first veneer 2 is affected by the humidity of the environment and undergoes shrinkage and swelling deformation, the setting of the preform along the grain direction makes the first veneer 2 and the substrate 1 mutually constrain each other, which can reduce the deformation of the first veneer 2, thereby reducing the risk of cracking on the outer surface of the first veneer 2 and helping to improve the surface quality of the composite board.

[0041] Specifically, the manufacturing process of the composite board consisting of a first single-layer board 2 and a substrate 1 is as follows:

[0042] 1. Pretreatment: Select high-quality, flawless ultra-thin veneers with a thickness of 0.1-0.5mm as the first veneer 2. Use a hot-press drying machine for hot-press drying and leveling treatment. The hot-press pressure is 0.5-0.8 MPa, and the temperature is 80-100℃. After hot-press drying, the moisture content of the first veneer 2 is controlled at 8%-15%, and the surface is flat. Place a metal screen with a mesh size of ≤10 on top of the treated veneer, and apply a pressure of 0.1-0.5 MPa to the metal screen using a metal plate to form indentations of a certain depth on the veneer surface, creating the first glue-filling grooves 21, thus forming the first veneer 2.

[0043] 2. Impregnation: Vacuum impregnation of the first veneer 2 with phenolic resin of molecular weight 300-800 for about 40-50 minutes (holding negative pressure of -0.05MPa for 15 minutes, then applying pressure of 1.0MPa for 30 minutes); the resin content of the first veneer 2 is 20-50%;

[0044] 3. Applying adhesive: The surface of the first veneer 2 is treated with a compound phenolic resin, and the modified first veneer 2 is evenly coated with the resin at a dosage of 0.10-0.20 g / cm3. The compound phenolic resin includes toughening phenolic resin and formaldehyde reactant, with a weight ratio of 100:2.

[0045] 4. Installation: Lay the prepared first veneer 2 according to... Figure 1 The substrate is laid along the grain direction along the length of the substrate on a sanded and smoothed base plate 1.

[0046] 5. Pre-pressing: Pre-press the first single board 2 and the substrate 1 at room temperature of 20-25℃. The pre-pressing pressure is 1.5-4MPa and the time is 30-60min.

[0047] 6. Hot pressing: Press at 100-130℃ for 20-60 minutes, hot pressing pressure 2-5MPa;

[0048] 7. Aging: After demolding, the material is stacked and cold-pressed for aging for no less than 72 hours to form a composite board.

[0049] As a preferred embodiment of this application, such as Figure 3 As shown, the composite material also includes a second single-layer board 3 covering the upper surface of the first single-layer board 2. The first single-layer board 2 has multiple staggered second glue-filling grooves on the side facing the second single-layer board 3, and the second single-layer board 3 has multiple staggered third glue-filling grooves on the side facing the first single-layer board 2. The first single-layer board 2 and the second single-layer board 3 together cover the substrate 1, increasing the resistance to deformation of the outer surface of the composite material. Furthermore, the arrangement of the second and third glue-filling grooves enhances the bonding strength between the first single-layer board 2 and the second single-layer board 3.

[0050] In a preferred embodiment of this method, the first veneer 2 is assembled along the grain direction along the length of the board, and the second veneer 3 is assembled along the cross grain direction along the length of the board. When the first veneer 2 or the second veneer 3 undergoes shrinkage and expansion due to environmental humidity, the first veneer 2 assembled along the grain direction and the second veneer 3 assembled along the cross grain direction will restrain each other, reducing the deformation of the first veneer 2 and the second veneer 3, thereby reducing the probability of cracking on the outer surface of the second veneer 3 and helping to improve the outer surface quality of the composite board.

[0051] As a preferred example in this embodiment, such as Figure 4As shown, the composite material also includes a third veneer 4 covering the upper surface of the second veneer 3. The second veneer 3 has multiple staggered fourth glue-filling grooves on the side facing the third veneer 4, and the third veneer 4 has multiple staggered fifth glue-filling grooves on the side facing the second veneer 3. The first veneer 2, second veneer 3, and third veneer 4 together cover the substrate 1, increasing the composite material's resistance to deformation on its outer surface. Furthermore, the third and fourth glue-filling grooves enhance the bonding strength between the second veneer 3 and the third veneer 4.

[0052] Preferably, the third veneer 4 is assembled along the grain direction along the length of the board. When the first veneer 2 or the second veneer 3 undergoes shrinkage and swelling deformation due to environmental humidity, the first veneer 2 assembled along the grain direction and the second veneer 3 assembled across the grain direction will restrain each other. When the second veneer 3 or the third veneer 4 undergoes shrinkage and swelling deformation due to environmental humidity, the second veneer 3 assembled across the grain direction and the third veneer 4 assembled along the grain direction will restrain each other. When any one or more of the first veneer 2, the second veneer 3, and the third veneer 4 deform, they will pull against each other, reducing their respective deformation and helping to improve the surface quality of the composite board.

[0053] In the above embodiments, the second, third, fourth, and fifth glue-filling grooves have the same structure as the first glue-filling groove.

[0054] Specifically, the manufacturing process of the composite board composed of the first single board 2, the second single board 3, and the substrate 1 is as follows:

[0055] 1. Pre-treatment: Select high-quality, flawless ultra-thin veneers with a thickness of 0.1-0.5mm. Use a hot-press drying machine for hot-press drying and leveling. The hot-press pressure is 0.5-0.8 MPa, and the temperature is 80-100℃. After hot-press drying, the moisture content of the ultra-thin indented veneer is controlled at 8%-15%, and the surface is flat. Place a metal screen with a mesh size of ≤10 on top of the treated veneer and apply a pressure of 0.1-0.5 MPa to the metal screen using a metal plate to form indentations of a certain depth on the veneer surface, thus creating an ultra-thin indented veneer.

[0056] 2. Impregnation: Vacuum impregnation of ultrathin veneer with phenolic resin of molecular weight 300-800 for about 40-50 minutes (holding negative pressure of -0.05MPa for 15 minutes, then applying pressure of 1.0MPa for 30 minutes); the resin content of the veneer is 20-50%;

[0057] 3. Glue application: Surface treatment is performed using compound phenolic resin, which is then evenly applied to the modified wood veneer at a dosage of 0.10-0.20 g / cm3. The compound phenolic resin includes toughening phenolic resin and formaldehyde reactant, with a weight ratio of 100:2.

[0058] 4. Installation: Lay one prepared ultra-thin embossed veneer according to... Figure 3 The treated ultra-thin embossed veneer is laid along the length of the board across the grain on a sanded and smoothed reconstituted wood panel. Figure 3 The material is laid along the grain direction of the board along its length on the ultra-thin embossed veneer.

[0059] 5. Pre-compression: At room temperature (20-25℃), the pre-compression pressure is 1.5-4MPa, and the time is 30-60min;

[0060] 6. Hot pressing: Press at 100-130℃ for 20-60 minutes, with a hot pressing pressure of 2-5 MPa;

[0061] 7. Aging: After demolding, the material is stacked and cold-pressed for aging for no less than 72 hours.

[0062] The manufacturing process of the composite board consisting of the first single board 2, the second single board 3, the third single board 4, and the substrate 1 is as follows:

[0063] 1. Pre-treatment: Select high-quality, flawless ultra-thin veneers with a thickness of 0.1-0.5mm. Use a hot-press drying machine for hot-press drying and leveling. The hot-press pressure is 0.5-0.8 MPa, and the temperature is 80-100℃. After hot-press drying, the moisture content of the ultra-thin indented veneer is controlled at 8%-15%, and the surface is flat. Place a metal screen with a mesh size of ≤10 on top of the treated veneer and apply a pressure of 0.1-0.5 MPa to the metal screen using a metal plate to form indentations of a certain depth on the veneer surface, thus creating an ultra-thin indented veneer.

[0064] 2. Impregnation: Pine veneer is vacuum impregnated with phenolic resin with a molecular weight of 300-800 for about 40-50 minutes (negative pressure of -0.05MPa is maintained for 15 minutes, then pressure of 1.0MPa is applied for 30 minutes); the resin content of the veneer is 20-50%;

[0065] 3. Glue application: Surface treatment is performed using compound phenolic resin, which is then evenly applied to the modified wood veneer at a dosage of 0.10-0.20 g / cm3. The compound phenolic resin includes toughening phenolic resin and formaldehyde reactant, with a weight ratio of 100:2.

[0066] 4. Installation: Lay one prepared ultra-thin embossed veneer according to... Figure 4 The prepared ultra-thin embossed veneer is laid along the length and grain of the board onto the sanded and smoothed substrate 1. Figure 4 The treated ultra-thin embossed veneer is laid along the transverse grain of the board length in a manner described above. One prepared ultra-thin embossed veneer is then arranged according to... Figure 4The material is laid along the grain direction of the board along its length on the ultra-thin embossed veneer.

[0067] 5. Pre-compression: At room temperature (20-25℃), the pre-compression pressure is 1.5-4MPa, and the time is 30-60min;

[0068] 6. Hot pressing: Press at 100-130℃ for 20-60 minutes, with a hot pressing pressure of 2-5 MPa;

[0069] 7. Aging: After demolding, the material is stacked and cold-pressed for aging for no less than 72 hours.

[0070] Preferably, the thickness of the second single board 3 and the third single board 4 is also in the range of 0.1-0.5mm.

[0071] The terms "parallel grain" and "cross grain" in the first veneer, second veneer, and third veneer mentioned in this application refer to the direction of wood fiber direction being perpendicular to the direction of wood cutting, and "cross grain" referring to the direction of wood fiber direction being parallel to the direction of wood cutting.

[0072] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0073] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0074] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A high-surface-quality wood-based composite board, characterized in that, The device includes a substrate and a first single board covering the substrate. The thickness of the first single board is D, where 0.1 mm ≤ D ≤ 0.5 mm. The first single board has multiple staggered first potting grooves on one side facing the substrate.

2. The high surface quality wood-based composite board according to claim 1, characterized in that, The first glue-filling groove includes a first groove extending along the length of the first veneer and a second groove arranged at an angle to the first groove, wherein the angle between the first groove and the second groove is α, and 60°≤α≤90°.

3. The high surface quality wood-based composite board according to claim 2, characterized in that, The two adjacent first grooves and the two adjacent second grooves together form a ring of grooves, and the number of such rings per inch is no more than 10.

4. The high surface quality wood-based composite board according to claim 1, characterized in that, The first single board is assembled along the grain direction along the length of the board.

5. The high surface quality wood-based composite board according to claim 1, characterized in that, It also includes a second veneer covering the upper surface of the first veneer, wherein the first veneer has a plurality of staggered second glue-filling grooves on the side facing the second veneer, and the second veneer has a plurality of staggered third glue-filling grooves on the side facing the first veneer.

6. The high surface quality wood composite board according to claim 5, characterized in that, The first veneer is assembled along the length of the board in the direction of parallel grain, and the second veneer is assembled along the length of the board in the direction of transverse grain.

7. The high surface quality wood-based composite board according to claim 5, characterized in that, It also includes a third veneer covering the upper surface of the second veneer, wherein the second veneer has multiple staggered fourth glue-filling grooves on the side facing the third veneer, and the third veneer has multiple staggered fifth glue-filling grooves on the side facing the second veneer.

8. The high surface quality wood composite board according to claim 7, characterized in that, The third veneer is assembled along the grain direction along the length of the board.

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