Hybrid artificial board

Abstract

The utility model discloses a mixed type artificial board, the number of layers is an odd number, a wood veneer serves as a core layer of a symmetry center plane, and the layers on the two sides of the symmetry center plane correspond to each other. The structural units of the layers on the two sides of the symmetric center plane are wood veneers, wood shavings, particles or fibers, the adjacent layers are selected from different types of structural units, and the adjacent layers are selected from different types of plates. According to the artificial board, the product adaptability and the product performance are improved, the production method is high in production efficiency, the application field of the artificial board is particularly expanded, and the technical problem that continuous and automatic production of traditional plywood is difficult to achieve is particularly solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to timber processing technical field especially relates to a mixed type artificial board and preparation method and application thereof. BACKGROUND

[0002] Since using single board as structural unit, plywood retains the porous characteristics of wood, and the mechanical properties of the board are obviously better than those of shaving board and medium density fiberboard due to the cross of wood texture in the paving process, but the plywood industry in China is mainly composed of small and medium-sized enterprises, which generally use intermittent or periodic production process, and still belongs to labor-intensive industry with low production efficiency, and the aging of single board after gluing and the pre-pressing process cause process stagnation and increase the process difficulty, so how to upgrade the production mode of plywood is a technical problem to be solved in the plywood industry.

[0003] In recent years, the shaving board and medium density fiberboard industry has upgraded the intermittent or periodic production technology to continuous flat pressing production technology, which has improved the production efficiency, but the size of the structural unit is small in the manufacturing process of shaving board and medium density fiberboard, and the overall mechanical properties of the board are not high, at the same time, the oriented shaving board uses directional paving technology, so that the parallel (or longitudinal) static bending strength of the board is improved, but the vertical (or transverse) strength is still low.

[0004] The authorized invention patent ZL02134156.7 "Three-layer structure wood composite board and its manufacturing method" firstly proposes that the core layer uses large shaving, and the surface uses fiber or particle structural unit, aiming to balance the surface quality and mechanical properties such as static bending strength; the invention patent application 201711302868.7 "Oriented shaving board and oriented artificial board" is similar to the foregoing authorized patent, which relates to an oriented shaving board and oriented artificial board with higher surface fineness, but these patents do not solve the technical problem of low transverse static bending strength of shaving board. The authorized invention patent ZL202310313019.0 "ENF grade bamboo-wood composite mixed artificial board and continuous flat pressing manufacturing method" and the invention patent application CN116674040A "Paper-faced mixed artificial board for building interior partition wall and production method thereof" provide different material mixed artificial board and mixed artificial board with artificial board product as structural unit and its production method, wherein the core layer is shaving board or fiberboard, and the technical features are divided into several times of paving and several times of hot pressing, but these technical solutions do not solve the technical problem of continuous and automatic production of single board type artificial board such as plywood. UTILITY MODEL CONTENTS

[0005] Therefore, the main purpose of the utility model is to provide a mixed type artificial board and a preparation method and application thereof, so as to at least partially solve the above technical problems.

[0006] In order to achieve the above object, as a first aspect of the utility model, provide mixed type artificial board, the layer number of mixed type artificial board is odd (preferably 3-7 layers), with wood veneer as the core layer of symmetry center plane, the layers on both sides of symmetry center plane correspond to each other; it needs to be explained that, the corresponding includes the tree species, fiber direction, thickness, layer number, manufacturing method, moisture content of wood veneer, etc. are corresponding; the odd layer artificial board can guarantee the symmetry center plane in the core layer, and can guarantee the strength.

[0007] In the mixed type artificial board, the texture of the wood veneer is arranged along the length direction perpendicular to the mixed type artificial board; the texture or fiber of other types of structural units forms an angle of 60-90° with the texture of the wood veneer.

[0008] Different types of boards are arranged adjacent to each other, and the texture forms a certain angle, which can ensure that the tensile strength in each direction is basically consistent; in particular, the texture of the wood veneer is arranged along the length direction, which can improve the mechanical properties of the product. The proportion of different types of boards can also be adjusted to ensure that the prepared artificial board meets the requirements of different mechanical properties.

[0009] The wood veneer is spliced along the length direction of the mixed type artificial board, and the other types of boards are continuous structures; the difficulty of using continuous flat pressing production technology for plywood and other veneer type artificial boards lies in the continuous splicing of the veneer, especially the continuous splicing along the wood grain direction, which has a large technical difficulty, while the transverse splicing can realize large-scale continuous production. Therefore, the utility model proposes that the core layer and the inner surface layer use transversely spliced veneer, and other layers use shaving, fiber or particle continuous paving and hot pressing, which greatly reduces the production technical difficulty of subsequent continuous paving and continuous hot pressing.

[0010] Preferably, the total thickness of the wood veneer accounts for 10%-60% (for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60% or any value in the range, due to the limitation of the length, it is not described again) of the total thickness of the mixed type artificial board, preferably 30%-50%;

[0011] Preferably, the number of layers of the wood veneer is 1-5 layers.

[0012] Preferably, in the said particle board, the length of the particle is 50-200mm (for example, it can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm or any value within the range due to the limitation of the length, which will not be listed here), the thickness of the particle is 0.2-1.2mm (for example, it can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm or any value within the range due to the limitation of the length, which will not be listed here), and the arrangement of the particle is random arrangement and / or directional arrangement.

[0013] The said particle board is formed by bonding the particles with an adhesive, and the adhesive is selected from formaldehyde series resin, isocyanate series resin, polyurethane resin or biomass resin.

[0014] The said formaldehyde series resin is selected from urea-formaldehyde resin, modified urea-formaldehyde resin or phenol-formaldehyde resin.

[0015] Preferably, the thickness of the wood veneer of the said core layer is 1.5-4.5mm (for example, it can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm or any value within the range due to the limitation of the length, which will not be listed here), preferably 1.0-3.0mm, and greater than or equal to the thickness of the wood veneer of other layers.

[0016] Preferably, the layers of the said hybrid wood-based panel are bonded by an adhesive.

[0017] The said adhesive is selected from formaldehyde series resin, isocyanate series resin, polyurethane resin or biomass resin.

[0018] The said formaldehyde series resin is selected from urea-formaldehyde resin, modified urea-formaldehyde resin or phenol-formaldehyde resin.

[0019] Preferably, the splicing method of the said wood veneer is selected from glue line splicing, adhesive tape splicing, non-woven fabric splicing or ground lap joint.

[0020] In the second aspect of the utility model, the preparation method of the mixed artificial board is provided as described in the first aspect, and the preparation method comprises the following steps:

[0021] (1) continuously laying wood veneers and splicing into a continuous state, spraying and / or showering adhesive on the surface of the wood veneer;

[0022] (2) according to the production process of the particle board, the particle board blank and / or the fiber board blank is obtained;

[0023] (3) the wood veneer, the particle board blank, the particle board blank and / or the fiber board blank are continuously laid on both sides of the core layer in a continuous laying mode;

[0024] (4) continuously pre-pressing, pre-heating and hot-pressing the laid and formed board blank to obtain the mixed artificial board.

[0025] Preferably, the layers are laid one by one.

[0026] Preferably, in step (1), the single-side glue application amount of the wood veneer is 150-300 g / mm 2 (for example, it can be 150 g / mm 2 , 160 g / mm 2 , 170 g / mm 2 , 180 g / mm 2 , 190 g / mm 2 , 200 g / mm 2 , 210 g / mm 2 , 220 g / mm 2 , 230 g / mm 2 , 240 g / mm 2 , 250 g / mm 2 , 260 g / mm 2 , 270 g / mm 2 , 280 g / mm 2 , 290 g / mm 2 , 300 g / mm 2 or any value in the range, which is not described again due to the limitation of the length); and / or

[0027] The roller coater is used for glue application.

[0028] Preferably, in step (2), the preparation method of the particle board blank comprises: uniformly mixing the adhesive and the particles, and then continuously laying the particle board blank; and / or

[0029] The preparation method of the particle board blank comprises: uniformly mixing the adhesive and the particles, and then continuously laying the particle board blank; and / or

[0030] The method for preparing the fiberboard blank comprises: mixing the adhesive with separated wet fibers at the outlet of a thermal grinder, drying to a specified moisture content, and then continuously laying into a fiberboard blank.

[0031] Preferably, in step (4), the pressure of the continuous pre-pressing is 3.0-6.0 Mpa (for example, it can be 3.0 Mpa, 3.2 Mpa, 3.4 Mpa, 3.6 Mpa, 3.8 Mpa, 4.0 Mpa, 4.2 Mpa, 4.4 Mpa, 4.6 Mpa, 4.8 Mpa, 5.0 Mpa, 5.2 Mpa, 5.4 Mpa, 5.6 Mpa, 5.8 Mpa, 6.0 Mpa or any value within the range, which is not listed due to space limitation); and / or

[0032] The preheating specifically comprises: preheating the shaving board blank to 65-85℃ (for example, it can be 65℃, 66℃, 67℃, 68℃, 69℃, 70℃, 71℃, 72℃, 73℃, 74℃, 75℃, 76℃, 77℃, 78℃, 79℃, 80℃, 81℃, 82℃, 83℃, 84℃, 85℃ or any value within the range, which is not listed due to space limitation) within 20-60s (for example, it can be 20s, 22s, 24s, 26s, 28s, 30s, 32s, 34s, 36s, 38s, 40s, 42s, 44s, 46s, 48s, 50s, 52s, 54s, 56s, 58s, 60s or any value within the range, which is not listed due to space limitation); and / or

[0033] The hot pressing is performed using a continuous flat press; and / or

[0034] The hot pressing factor of the hot pressing is 5-15 s / mm (for example, it can be 5 s / mm, 6 s / mm, 7 s / mm, 8 s / mm, 9 s / mm, 10 s / mm, 11 s / mm, 12 s / mm, 13 s / mm, 14 s / mm, 15 s / mm or any value within the range, which is not listed due to space limitation).

[0035] The preparation method of the mixed type artificial board provided by the utility model has the advantages that continuous laying and continuous flat pressing are adopted, continuous laying and continuous flat pressing production technologies are combined, and the production efficiency is improved. The key to the continuous flat pressing production lies in the continuous laying of the board blank in addition to the wood veneer. The utility model is continuously laid layer by layer along the advancing direction of the production line, and in particular, the core layer veneer is laid transversely and the wood textures of the adjacent layers are crossed, so that the technical problem that the continuous production of the veneer type artificial board cannot be realized is solved.

[0036] In order to further improve the production efficiency, the preheating process is additionally arranged after the paving is completed, the temperature of the core layer of the blank is rapidly increased to accelerate the curing of the resin adhesive, so that the hot pressing time is shortened and the production efficiency is improved.

[0037] In the third aspect of the utility model, the application of the mixed artificial board in the housing construction and decoration field is provided.

[0038] Based on the above technical scheme, the mixed artificial board, the preparation method and the application thereof have at least one of the following beneficial effects compared with the prior art:

[0039] 1) The utility model creates a new type of structural artificial board through the reorganization of structural units: the utility model reorganizes and optimizes various structural units, which enriches the variety of artificial board products in China. Compared with ordinary shaving board and directional shaving board, the transverse static strength is significantly improved, and compared with plywood, the production efficiency is significantly improved, and finally the adaptability of the artificial board product is improved to meet the mechanical and dimensional stability requirements of artificial boards in different application fields, which helps to expand the application market of artificial boards, especially in the field of building.

[0040] 2) A technical route is provided for continuous and automatic production of veneer type artificial boards: the utility model integrates the production of veneer type artificial boards with the production technology of shaving boards (including directional shaving boards) and medium density fiber boards, which helps to solve the technical difficulties of continuous and automatic production and low production efficiency of veneer type artificial boards. The method of the utility model is integrated with the existing continuous flat pressing production technology, without changing the basic production equipment and basic production process flow of the existing continuous flat pressing production line, and only appropriate equipment is added, which is convenient for upgrading the existing production line.

[0041] 3) The utility model uses large-size veneer type structural units, which is beneficial to reduce the amount of adhesive, which is beneficial to reduce the manufacturing cost and also reduces the formaldehyde emission of artificial boards, thereby further improving the environmental protection level of artificial boards.

[0042] 4) The preheating technology in the utility model can accelerate the temperature rising speed of the core layer of the blank and accelerate the curing of the resin adhesive, which helps to further improve the production efficiency of the whole line. In addition, the method of the utility model is suitable for various adhesives and can meet the requirements of environmental protection and mechanical properties at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a preparation method schematic view of the mixed artificial board provided by the utility model.

[0044] Figure 2 It is a structural view of the mixed artificial board provided by the utility model.

[0045] Wherein, 1: core layer, 2: layers on both sides of the symmetry center plane. DETAILED DESCRIPTION

[0046] The prior art has poor performance and low production efficiency, and the technical problem of low transverse static strength of the artificial board has not been solved, and continuous automatic production cannot be realized. The utility model is improved by the utility model person through earnest research on the above steps and the structure of the artificial board, so that a mixed artificial board with more excellent mechanical properties and capable of continuous automatic production is obtained. Specifically, as a first aspect of the utility model, a mixed artificial board is provided, the number of layers of the mixed artificial board is odd (preferably 3-7 layers), and the core layer 1 of the wood veneer is the symmetry center plane, and the layers 2 on both sides of the symmetry center plane correspond to each other. It should be noted that the corresponding includes the species, fiber direction, thickness, number of layers, manufacturing method, and moisture content of the wood veneer, which are all corresponding. The odd number of layers of the artificial board can ensure that the symmetry center plane is in the core layer, and the strength can be ensured.

[0047] The structure unit of the layers 2 on both sides of the symmetry center plane is wood veneer, shavings, particles, or fibers, and adjacent layers are selected from different types of structure units, and adjacent layers are selected from different types of boards;

[0048] In the mixed artificial board, the grain of the wood veneer is arranged along the length direction perpendicular to the mixed artificial board; and the grain or fiber of the other types of structure units forms an angle of 60-90° with the grain of the wood veneer.

[0049] Different types of boards are arranged adjacent to each other, and the grains form a certain angle, which can ensure that the tensile strength in each direction is basically consistent. In particular, the grain of the wood veneer is arranged along the length direction, which can improve the mechanical properties of the product. The proportion of different types of boards can also be adjusted to ensure that the prepared artificial board meets the requirements of different mechanical properties.

[0050] The wood veneer is spliced along the length direction of the mixed artificial board, and the other types of boards are continuous structures; the difficulty of using continuous flat pressing production technology for plywood and other veneer artificial boards lies in the continuous splicing of the veneer, especially the continuous splicing along the grain direction of the wood, which has a large technical difficulty, and the transverse splicing can be realized on a large scale. Therefore, the utility model proposes that the core layer and the inner surface layer use transversely spliced veneers, and the other layers use shavings, fibers, or particles for continuous paving and hot pressing, which greatly reduces the technical difficulty of subsequent continuous paving and continuous hot pressing production.

[0051] In one preferred embodiment, the total thickness of the wood veneer accounts for 10-60% (for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60% or any value within the range, due to the limitation of the length, it is not listed here) of the total thickness of the hybrid wood-based panel, preferably 30-50%.

[0052] In one preferred embodiment, in the particle board, the length of the particle is 50-200mm (for example, it can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm or any value within the range, due to the limitation of the length, it is not listed here), the thickness of the particle is 0.2-1.2mm (for example, it can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm or any value within the range, due to the limitation of the length, it is not listed here), and the arrangement of the particle is random arrangement and / or directional arrangement.

[0053] The particle board is formed by bonding the particles with an adhesive, and the adhesive is selected from formaldehyde series resin, isocyanate series resin, polyurethane resin or biomass resin.

[0054] The formaldehyde series resin is selected from urea-formaldehyde resin, modified urea-formaldehyde resin or phenol-formaldehyde resin.

[0055] In one preferred embodiment, the thickness of the wood veneer of the core layer is 1.5-4.5mm (for example, it can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm or any value within the range, due to the limitation of the length, it is not listed here), preferably 1.0-3.0mm, and greater than or equal to the thickness of the wood veneer of other layers.

[0056] In one preferred embodiment, the layers of the hybrid wood-based panel are bonded by an adhesive;

[0057] The adhesive is selected from formaldehyde series resin, isocyanate series resin, polyurethane resin or biomass resin.

[0058] The formaldehyde series resin is selected from the group consisting of urea-formaldehyde resin, modified urea-formaldehyde resin or phenol-formaldehyde resin.

[0059] In a preferred embodiment, the wood veneer is spliced by means selected from the group consisting of glue line splicing, adhesive tape splicing, non-woven fabric splicing or ground lap.

[0060] In a preferred embodiment, the texture or fiber of the other kind of board forms an angle of 60-90° with the texture of the wood veneer; this ensures that the mechanical strength of the mixed type of artificial board in each direction is basically consistent and a certain strength level is ensured.

[0061] In a preferred embodiment, the number of layers of the wood veneer as the board material on both sides of the center plane of symmetry is 1-5 layers.

[0062] In the second aspect of the utility model, the preparation method of the mixed type of artificial board is provided, and the preparation method comprises the following steps:

[0063] (1) continuously laying the wood veneer and splicing into a continuous state, and spraying and / or pouring the adhesive on the surface of the wood veneer;

[0064] (2) obtaining the continuous shaving board blank, particle board blank and / or fiber board blank according to the production process of the shaving board, particle board or fiber board;

[0065] (3) continuously laying the wood veneer, shaving board blank, particle board blank and / or fiber board blank on both sides of the core layer respectively by means of continuous laying;

[0066] (4) continuously pre-pressing, pre-heating and hot-pressing the laid and formed board blank to obtain the mixed type of artificial board.

[0067] In a preferred embodiment, the layers are laid one by one in sequence.

[0068] In a preferred embodiment, in step (1), the single-side glue application amount of the wood veneer is 150-300 g / mm 2 (for example, it can be 150 g / mm 2 , 160 g / mm 2 , 170 g / mm 2 , 180 g / mm 2 , 190 g / mm 2 , 200 g / mm 2 , 210 g / mm 2 , 220 g / mm 2 , 230 g / mm 2 , 240 g / mm 2 , 250 g / mm 2260 g / mm 2 270 g / mm 2 280 g / mm 2 290 g / mm 2 300 g / mm 2 or any value within the range, due to the limitation of the length of the article, it will not be repeated); and / or

[0069] The glue is applied using a roller coater.

[0070] In a preferred embodiment, in step (2), the method for preparing the particle board blank comprises: mixing the adhesive and the particles uniformly, and then continuously laying the particles into the particle board blank; and / or

[0071] The method for preparing the particle board blank comprises: mixing the adhesive and the particles uniformly, and then continuously laying the particles into the particle board blank; and / or

[0072] The method for preparing the fiber board blank comprises: mixing the adhesive with the separated wet fibers at the outlet of the hot mill, and drying to a specified moisture content, and then continuously laying the fibers into the fiber board blank.

[0073] In a preferred embodiment, in step (4), the pressure of the continuous pre-pressing is 3.0-6.0 Mpa (for example, it can be 3.0 Mpa, 3.2 Mpa, 3.4 Mpa, 3.6 Mpa, 3.8 Mpa, 4.0 Mpa, 4.2 Mpa, 4.4 Mpa, 4.6 Mpa, 4.8 Mpa, 5.0 Mpa, 5.2 Mpa, 5.4 Mpa, 5.6 Mpa, 5.8 Mpa, 6.0 Mpa or any value within the range, due to the limitation of the length of the article, it will not be repeated); and / or

[0074] The preheating step specifically comprises: preheating the particle board blank to 65-85℃ (for example, it can be 65℃, 66℃, 67℃, 68℃, 69℃, 70℃, 71℃, 72℃, 73℃, 74℃, 75℃, 76℃, 77℃, 78℃, 79℃, 80℃, 81℃, 82℃, 83℃, 84℃, 85℃ or any value within the range, due to the limitation of the length of the article, it will not be repeated) within 20-60s (for example, it can be 20s, 22s, 24s, 26s, 28s, 30s, 32s, 34s, 36s, 38s, 40s, 42s, 44s, 46s, 48s, 50s, 52s, 54s, 56s, 58s, 60s or any value within the range, due to the limitation of the length of the article, it will not be repeated); and / or

[0075] The hot pressing is performed using a continuous flat press; and / or

[0076] The hot-pressing factor of the hot-pressing is 5-15 s / mm (for example, can be 5 s / mm, 6 s / mm, 7 s / mm, 8 s / mm, 9 s / mm, 10 s / mm, 11 s / mm, 12 s / mm, 13 s / mm, 14 s / mm, 15 s / mm or any value within the range, which is not repeated due to the limitation of the length).

[0077] The preparation method of the mixed type artificial board provided by the utility model realizes continuous flat pressing production, and the key to the continuous flat pressing production lies in the continuous laying of the board blank except the wood veneer, the utility model lays continuously layer by layer along the advancing direction of the production line, and especially the innovative utility model takes the horizontal laying of the core layer veneer as the center and the wood textures of the adjacent layers cross each other, so that the technical problem that the veneer type artificial board cannot realize continuous production is overcome.

[0078] In order to further improve the production efficiency, the utility model adds a preheating process after the laying is completed, accelerates the curing of the resin adhesive by rapidly increasing the temperature of the core layer of the board blank, thereby shortens the hot-pressing time and improves the production efficiency.

[0079] In the third aspect of the utility model, the mixed type artificial board as described in the first aspect is applied in the field of house building and decoration.

[0080] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below in combination with specific examples and with reference to the drawings.

[0081] Example 1

[0082] 1) The wood veneer type structural unit is prepared according to the conventional veneer production method, wherein the wood veneer thickness of the core layer horizontal veneer layer is 2.7 mm, and the wood veneer thickness of the surface layer horizontal veneer layer is 1.4 mm.

[0083] 2) The flaky type shaving structural unit is prepared according to the conventional shaving production method, wherein the shaving length is 50 mm and the thickness is 0.2 mm.

[0084] 3) After the above wood veneer type structural unit and flaky shaving type structural unit are dried, they enter the gluing process:

[0085] (1) Wood veneer type structural unit: uniformly spray the polyurethane resin type adhesive on the surface of the veneer, wherein the core layer horizontal veneer layer is double-sided coated with the adhesive, and the upper and lower surface horizontal veneer layers are single-sided coated with the adhesive, and the adhesive amount is 150 g / mm 2 ;

[0086] (2) Shaving type structural unit: the measured isocyanate type adhesive and shavings are sent into the glue mixer to mix uniformly;

[0087] 4) The lower surface transverse wood veneer layer, the lower inner ply longitudinal strand layer, the core transverse wood veneer layer, the upper inner ply longitudinal strand layer, and the upper surface wood transverse veneer layer are sequentially laid on the conveyor belt, the longitudinal strand layer and the wood veneer layer are at a 90° angle, and a continuous board blank is obtained.

[0088] 5) The formed board blank is continuously pre-pressed using a pair of pressing rollers, and the pre-pressing pressure is 4.0 MPa.

[0089] 6) Steam preheating: before the board blank enters the press, steam preheating is used to preheat the longitudinal strand layer board blank to 85°C within 20 seconds.

[0090] 7) Hot pressing: a continuous flat press is used, and the hot pressing factor is 5 s / mm.

[0091] After the above steps, a five-layer structure hybrid panel with a total thickness of 18 mm is obtained, in which the thickness of the transverse wood veneer layer accounts for 30% of the total thickness of the hybrid panel.

[0092] Example 2

[0093] 1) The wood veneer type structural unit is prepared according to the conventional veneer production method, in which the wood veneer thickness of the core transverse wood veneer layer is 2.5 mm, and the wood veneer thickness of the inner ply transverse wood veneer layer is 1.0 mm.

[0094] 2) The flaky type strand structural unit is prepared according to the conventional strand production method, in which the strand length is 200 mm and the thickness is 1.2 mm.

[0095] 3) The granular fine strand structural unit is prepared according to the conventional strand production method.

[0096] 4) After the above wood veneer type structural unit, flaky strand type structural unit, and granular fine strand are dried, they enter the glue application process:

[0097] (1) Wood veneer type structural unit: urea-formaldehyde resin adhesive is uniformly sprayed on both surfaces of the wood veneer, and the glue application amount is 300 g / mm 2 ;

[0098] (2) Strand type structural unit: a metered amount of urea-formaldehyde resin adhesive and strands are fed into a glue mixer for uniform mixing;

[0099] (3) Granular fine strand structural unit: a metered amount of urea-formaldehyde resin adhesive and strands are fed into a glue mixer for uniform mixing.

[0100] 5) sequentially lay the lower surface granular fine shavings, the lower inner surface layer of transverse veneer, the lower shaving layer, the core layer of transverse veneer, the upper shaving layer, the upper inner surface layer of transverse veneer, and the upper surface granular fine shavings on the conveying belt, the texture of the shaving layer and the wood veneer texture form an angle of 125°, to obtain a continuous board blank.

[0101] 6) The formed board blank is continuously pre-pressed using a pair of pressing rollers, and the pre-pressing pressure is 5.0 MPa.

[0102] 7) Steam preheating: before entering the press, the board blank is preheated to 65℃ within 20 seconds using steam.

[0103] 8) Hot pressing: a continuous flat press is used, and the hot pressing factor is 8 s / mm.

[0104] After the above steps, a seven-layer structure hybrid wood-based panel with a total thickness of 18 mm is obtained, in which the thickness of the transverse wood veneer layer accounts for 25% of the total thickness of the hybrid wood-based panel.

[0105] Example 3

[0106] 1) Prepare the wood veneer type structural unit according to the conventional wood veneer production method, in which the thickness of the transverse wood veneer layer is 1.8 mm.

[0107] 2) Prepare the flaky shaving type structural unit according to the conventional shaving production method, in which the shaving length is 70 mm and the thickness is 0.5 mm.

[0108] 3) Prepare the gypsum, cement, or stone powder type inorganic powder particle structural unit according to the conventional inorganic particle production method of gypsum, cement, or stone powder.

[0109] 4) After the above wood veneer type structural unit and flaky shaving type structural unit are dried, they enter the glue application process:

[0110] (1) Wood veneer type structural unit: uniformly spray polyurethane resin adhesive on both surfaces of the wood veneer, and the glue application amount is 150 g / mm 2 ;;

[0111] (2) Shaving type structural unit: mix the measured modified urea-formaldehyde resin adhesive and shavings in a glue mixer.

[0112] (3) Inorganic powder particle structural unit: mix the measured polyurethane resin adhesive and inorganic powder particle structural unit uniformly.

[0113] 5) Sequentially lay the lower surface powder type structural unit, the lower shaving layer, the core layer of transverse veneer, the upper shaving layer, and the upper surface powder type structural unit on the conveying belt, and the texture of the shaving layer and the wood veneer texture form an angle of 80°, to obtain a continuous board blank.

[0114] 6) The continuously formed board blank is continuously pre-pressed using a pair of press rollers, with a pre-pressing pressure of 6.0 MPa.

[0115] 7) Steam preheating: Before entering the press, the board blank is preheated using steam, and the temperature of the longitudinal strand layer is preheated to 70°C within 20 seconds.

[0116] 8) Hot-pressing forming: A continuous flat press is used, with a hot-pressing factor of 7 s / mm.

[0117] After the above steps, a five-layer structure hybrid wood-based panel with a total thickness of 18 mm is obtained, in which the thickness of the transverse wood veneer layer accounts for 10% of the total thickness of the hybrid wood-based panel.

[0118] Example 4

[0119] 1) The wood veneer type structural unit is prepared according to the conventional wood veneer production method, in which the thickness of the transverse wood veneer layer is 2.3 mm.

[0120] 2) The sheet type strand type structural unit is prepared according to the conventional strand production method, in which the length of the strand is 150 mm and the thickness is 0.7 mm.

[0121] 3) The granular fine strand type structural unit is prepared according to the conventional strand production method.

[0122] 4) After the above wood veneer type structural unit and sheet type strand type structural unit are dried, they enter the gluing process:

[0123] (1) Wood veneer type structural unit: uniformly spray the biomass resin type adhesive on both surfaces of the veneer, with a glue application amount of 150 g / mm 2 ;

[0124] (2) Strand type structural unit: metered isocyanate type adhesive and strands are fed into a glue mixer for uniform mixing;

[0125] (3) Granular fine strand type structural unit: metered phenolic resin adhesive and strands are fed into a glue mixer for uniform mixing.

[0126] 5) The granular fine strand on the lower surface, the lower longitudinal strand layer, the core layer transverse veneer layer, the upper longitudinal strand layer, and the granular fine strand on the upper surface are sequentially laid on the conveyor belt, with the longitudinal strand layer texture at a 100° angle with the wood veneer texture, to obtain a continuous board blank.

[0127] 6) The continuously formed board blank is continuously pre-pressed using a pair of press rollers, with a pre-pressing pressure of 3.0 MPa.

[0128] 7) Steam preheating: Before entering the press, the board blank is preheated using steam, and the temperature of the longitudinal strand layer is preheated to 80°C within 20 seconds.

[0129] 8) Hot pressing: using a continuous flat press, with a hot pressing factor of 5 s / mm.

[0130] After the above steps, a five-layer hybrid panel with a total thickness of 18 mm is obtained, in which the transverse wood veneer layer thickness accounts for 13% of the total thickness of the hybrid panel.

[0131] Example 5

[0132] 1) Wood veneer type structural units were prepared according to the conventional wood veneer production method, in which the wood veneer thickness of the transverse wood veneer layer was 4.5 mm.

[0133] 2) Flaky type particle flake structural units were prepared according to the conventional particle flake production method, in which the particle flake length was 60 mm and the thickness was 0.5 mm.

[0134] 3) Granular fine particle flake structural units were prepared according to the conventional particle flake production method.

[0135] 4) After the above wood veneer type structural units and flaky particle flake type structural units were dried, they entered the glue application process:

[0136] (1) Wood veneer type structural units: uniformly spray the biomass resin adhesive on both surfaces of the wood veneer, with a glue application amount of 260 g / mm 2 ;

[0137] (2) Particle flake type structural units: uniformly mix the measured urea-formaldehyde resin adhesive and particle flake in a glue mixer;

[0138] (3) Granular fine particle flake structural units: uniformly mix the measured urea-formaldehyde resin adhesive and particle flake in a glue mixer.

[0139] 5) The lower surface particle flake layer, the core transverse veneer layer, and the upper surface particle flake layer were sequentially laid on the conveyor belt, with the particle flake layer texture at an angle of 110° to the wood veneer texture, to obtain a continuous panel blank.

[0140] 6) The formed panel blank was continuously pre-pressed using a counter-roller with a pre-pressing pressure of 5.0 MPa.

[0141] 7) Steam preheating: before entering the press, the panel blank was preheated to 75°C within 20 seconds using steam.

[0142] 8) Hot pressing: using a continuous flat press, with a hot pressing factor of 8 s / mm.

[0143] After the above steps, a three-layer hybrid panel with a total thickness of 18 mm was obtained, in which the transverse wood veneer layer thickness accounted for 17% of the total thickness of the hybrid panel.

[0144] Example 6

[0145] 1) Wood-based veneer type structural unit is prepared according to conventional wood-based veneer production method, wherein the wood-based veneer thickness of the transverse wood-based veneer layer is 2.3 mm.

[0146] 2) Fiber type structural unit is prepared according to conventional medium density fiberboard production method.

[0147] 3) After the above wood-based veneer type structural unit is subjected to a drying process, it enters a gluing process, wherein a polyurethane resin type adhesive is uniformly sprayed on both surfaces of the wood-based veneer, and the glue application amount is 150 g / mm 2 ;

[0148] 4) The metered modified urea-formaldehyde resin is mixed with the separated wet fibers at the outlet of the heat mill and then enters a drying pipeline for drying to a specified moisture content.

[0149] 5) The lower surface fibers, the core layer transverse veneer layer, and the upper surface fibers are sequentially laid on the conveying belt, and the fiber texture is at an angle of 75° with the wood-based veneer texture, to obtain a continuous board blank.

[0150] 6) The formed board blank is continuously pre-pressed using counter-pressing rollers, and the pre-pressing pressure is 4.0 MPa.

[0151] 7) Steam preheating: before the board blank enters the press, steam preheating is used to preheat the board blank to 65℃ within 20 seconds.

[0152] 8) Hot pressing: a continuous flat press is used, and the hot pressing factor is 7 s / mm.

[0153] After the above steps, a three-layer structure mixed type engineered wood board with a total thickness of 18 mm is obtained, wherein the thickness of the transverse wood-based veneer layer accounts for 13% of the total thickness of the mixed type engineered wood board.

[0154] Example 7

[0155] 1) Wood-based veneer type structural unit is prepared according to conventional wood-based veneer production method, wherein the wood-based veneer thickness of the core layer transverse wood-based veneer layer is 3.0 mm, and the veneer thickness of the surface layer transverse wood-based veneer layer is 1.5 mm.

[0156] 2) Flaky type shaving structural unit is prepared according to conventional shaving production method, wherein the shaving length is 50 mm, and the thickness is 0.2 mm.

[0157] 3) After the above wood-based veneer type structural unit and flaky shaving type structural unit are subjected to a drying process, they enter a gluing process:

[0158] (1) Wood-based veneer structure unit: isocyanate adhesive is uniformly sprayed on the surface of wood-based veneer, wherein the core layer transverse wood-based veneer layer is double-sided coated, and the upper and lower surface transverse wood-based veneer layers are single-sided coated, and the coating amount is 150 g / mm 2 ;

[0159] (2) Shaving structure unit: metered isocyanate adhesive and shavings are fed into a glue mixer and uniformly mixed;

[0160] 4) The lower surface transverse veneer layer, the lower inner surface longitudinal shaving layer, the core layer transverse veneer layer, the upper inner surface longitudinal shaving layer, and the upper surface transverse veneer layer are sequentially laid on the conveying belt, and the longitudinal shaving layer and the wood-based veneer layer are at a 90° angle, to obtain a continuous board blank.

[0161] 5) The formed board blank is continuously pre-pressed using a pair of pressing rollers, and the pre-pressing pressure is 3.0 MPa.

[0162] 6) Steam preheating: before entering the press, the board blank is preheated to 80℃ within 16 seconds using steam.

[0163] 7) Hot pressing: a continuous flat press is used, and the hot pressing factor is 4 s / mm.

[0164] After the above steps, a five-layer structure mixed wood-based panel with a total thickness of 15 mm is obtained, wherein the thickness of the transverse wood-based veneer layer accounts for 40% of the total thickness of the mixed wood-based panel.

[0165] Example 8

[0166] 1) The wood-based veneer structure unit is prepared according to the conventional wood-based veneer production method, wherein the wood-based veneer thickness of the core layer transverse wood-based veneer layer is 3.0 mm, and the wood-based veneer thickness of the surface layer transverse wood-based veneer layer is 1.5 mm.

[0167] 2) The flaky shaving structure unit is prepared according to the conventional shaving production method, wherein the shaving length is 50 mm and the thickness is 0.3 mm.

[0168] 3) After the above wood-based veneer structure unit and flaky shaving structure unit are dried, they enter the gluing process:

[0169] (1) Wood-based veneer structure unit: isocyanate adhesive is uniformly sprayed on the surface of wood-based veneer, wherein the core layer transverse wood-based veneer layer is double-sided coated with isocyanate adhesive, and the coating amount is 150 g / mm 2 , and the upper and lower surface transverse wood-based veneer layers are single-sided coated with phenolic resin, and the coating amount is 250 g / mm 2 ;

[0170] (2) Flakes structure unit: metered isocyanate adhesive and flakes are fed into a mixer to mix evenly;

[0171] 4) The lower surface transverse veneer layer, the lower inner surface longitudinal flake layer, the core layer transverse veneer layer, the upper inner surface longitudinal flake layer, and the upper surface transverse veneer layer are sequentially laid on the conveyor belt, and the longitudinal flake layer has a 95° angle with the wood veneer texture, to obtain a continuous board blank.

[0172] 5) The formed board blank is continuously pre-pressed using a pair of pressure rollers, and the pre-pressing pressure is 6.0 MPa.

[0173] 6) Steam preheating: before entering the press, the board blank is preheated to 85°C within 12 seconds using steam.

[0174] 7) Hot pressing: a continuous flat press is used, and the hot pressing factor is 3.7 s / mm.

[0175] After the above steps, a five-layer structure mixed wood-based panel with a total thickness of 12 mm is obtained, in which the thickness of the transverse wood veneer layer accounts for 50% of the total thickness of the mixed wood-based panel.

[0176] Performance test

[0177] The mixed wood-based panels prepared in Examples 1-8 were tested for performance, and Comparative Examples 1-7 used commercially available ordinary flakeboard (Comparative Examples 1-3), oriented flakeboard (Comparative Examples 4-6), and medium density fiberboard (Comparative Example 7), respectively. The specific test results are shown in Table 1.

[0178] It can be seen that the longitudinal static bending strength and transverse static bending strength of the mixed wood-based panels prepared in Examples 1-8 are slightly floating due to the different selection of boards and different angles, but are obviously superior to Comparative Examples 1-7; due to the reduction of adhesive, the formaldehyde emission is also significantly lower than Comparative Examples 1-7, but the bonding strength in the flakeboard is not reduced, and is basically the same as the currently marketed wood-based panels.

[0179] Table 1 Performance test results

[0180]

[0181] In summary, the mixed type artificial board and the preparation method thereof provided by the utility model enrich the variety of artificial board products in China through the optimization and recombination of various structural units. Compared with ordinary shaving board and oriented shaving board, the transverse static strength is significantly improved, and compared with plywood, the production efficiency is significantly improved, and finally the adaptability of the artificial board product is improved to meet the mechanical and dimensional stability requirements of artificial board in different application fields, which helps to expand the application market of artificial board, especially in the field of building. The utility model integrates the production technology of single board type artificial board, shaving board (including oriented shaving board) and medium density fiberboard, which helps to solve the technical difficulties of single board type artificial board, such as difficult continuous and automatic production and low production efficiency. The method of the utility model is integrated with the existing continuous flat pressing production technology, does not change the basic production equipment and basic production process flow of the existing continuous flat pressing production line, and appropriately increases the equipment, which is convenient for the transformation and upgrading of the existing production line. The utility model uses large-size single board type structural units, which is beneficial to reduce the amount of adhesive, which is beneficial to reduce the manufacturing cost and reduce the formaldehyde emission of artificial board, thereby further improving the environmental protection level of artificial board. The preheating technology in the utility model can accelerate the heating speed of the core layer of the blank and accelerate the curing of the resin adhesive, which helps to further improve the production efficiency of the whole line. In addition, the method of the utility model is suitable for various adhesives, which can meet the requirements of environmental protection and mechanical properties at the same time.

[0182] The above specific embodiments further illustrate the purpose, technical solutions and advantages of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A hybrid wood-based panel, characterized in that The number of layers of the mixed artificial board is odd, and the core layer (1) is a wood veneer as a symmetrical center plane, and the layers (2) on both sides of the symmetrical center plane correspond to each other; The structural units of the layers (2) on both sides of the symmetrical center plane are wood veneer, shaving structural unit, particle or fiber, and adjacent layers are selected from different types of structural units, and adjacent layers are selected from different types of boards; In the mixed artificial board, the texture of the wood veneer is arranged along the length direction perpendicular to the mixed artificial board, and the texture or fiber of other types of structural units forms an angle of 60-90° with the texture of the wood veneer; The wood veneer is spliced along the length direction of the mixed artificial board, and other types of structural units are continuous structures.

2. The hybrid wood-based panel according to claim 1, c h a r a c t e r i z e d in that The number of layers of the wood veneer is 1-5 layers.

3. The hybrid wood-based panel according to claim 1, wherein In the shaving structural unit, the shaving length is 50-200 mm, the shaving thickness is 0.2-1.2 mm, and the arrangement of the shavings is random arrangement and / or directional arrangement.

4. The hybrid wood-based panel according to claim 1, wherein The shaving structural unit is formed by bonding shavings with an adhesive.

5. The hybrid wood-based panel according to claim 1, wherein The thickness of the wood veneer of the core layer is 1.0-4.5 mm, and is greater than or equal to the thickness of the wood veneer of other layers.

6. The hybrid wood-based panel according to claim 1, wherein The layers of the mixed artificial board are bonded by an adhesive.

7. The hybrid wood-based panel according to claim 1, wherein The splicing mode of the wood veneer is selected from the following: glue line splicing, adhesive tape splicing, non-woven fabric splicing or grinding lap joint.

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