A kind of bamboo plywood and preparation method thereof

Abstract

The invention discloses a bamboo-wood plywood, which is formed by gluing a bamboo strip curtain layer, a wood veneer layer, a bamboo mat layer, and an impregnated paper layer. The wood veneer layer, the bamboo mat layer, and the impregnated paper layer are symmetrically arranged on both sides of the bamboo strip curtain layer in sequence. The bamboo strip curtain layer is woven from radial bamboo strips without removing bamboo green and bamboo yellow, and the bamboo mat layer is woven from chordal bamboo strips with bamboo green and bamboo yellow removed by warp and weft interweaving. The invention also discloses a preparation method of the bamboo-wood plywood. The invention has the advantages of high production efficiency, few hot pressing defects, suitable density, excellent mechanical properties, and the like.

Description

Technical Field

[0001] The invention relates to the technical field of plywood, in particular to a bamboo-wood plywood and a preparation method thereof. Background Art

[0002] Bamboo plywood has the advantages of tough material and excellent mechanical properties. my country has abundant bamboo resources and a short growth cycle. It has the characteristics of one-time planting and sustainable use. Replacing wood plywood with bamboo plywood can solve the problem that wood plywood is limited by the shortage of wood resources. Traditional bamboo plywood is made of bamboo mats, bamboo curtains, etc., and is prepared through processes such as drying, impregnation, leaching, secondary drying, assembly, and hot pressing. Compared with wood plywood, traditional bamboo plywood has the following problems:

[0003] ① Traditional bamboo plywood manufacturing adopts cold-in-cold-out hot pressing molding process, that is, "feeding-heating-insulating hot pressing-cooling-pressure relief and discharging". This process has the disadvantages of long hot pressing time, large consumption of heat energy and cooling water, etc., which directly leads to the long-term problems of low production efficiency, high energy consumption and high manufacturing cost of traditional bamboo plywood.

[0004] However, directly using the hot-in-hot-out hot pressing process, due to the single structure of the slab and the dense macro and micro pores between the units, it is difficult for moisture to migrate outward during the hot pressing process, resulting in excessive local steam pressure, and easy formation of hot pressing defects such as bubbling deformation and local damage, which seriously reduces the product quality and makes it unusable.

[0005] At present, the plywood manufacturing generally adopts the production process of secondary assembly and secondary hot pressing, that is, the slab is hot-pressed once and then melamine impregnated paper is applied and hot-pressed for a second time. The process is complicated and the production cost is high. In addition, before applying the melamine impregnated paper, the slab after the first hot pressing needs to be sanded, which further increases the process, wastes materials and increases costs.

[0006] ② The slab has high density and heavy weight, which limits its scope of use. It is also difficult to load and unload and has high transportation costs.

[0007] ③ The strength of the slab is obviously directional, the transverse strength is poor, the cross-grain nail holding force is poor, and the application range is limited.

[0008] ④ At present, plywood is made of bamboo curtains or bamboo mats. The green and yellow colors of bamboo strips affect the subsequent gluing and molding process as well as the physical and mechanical properties of the material. Therefore, they need to be de-greened and de-yellown first, which leads to reduced bamboo material utilization, large raw material losses, and increased production costs.

[0009] Compared with bamboo plywood, wood plywood is significantly weaker than bamboo plywood in terms of physical and mechanical properties such as surface hardness, elastic modulus, and tensile strength. Based on bamboo wood resources and the characteristics of bamboo and wood materials, combined with production practice and market demand, a new type of bamboo-wood plywood with simple production and manufacturing processes, low production costs, and excellent physical and mechanical properties is developed using bamboo and artificial forest fast-growing wood as manufacturing units. This is of great significance in promoting the transformation and upgrading of traditional bamboo plywood, realizing the high-value utilization of bamboo materials, and alleviating the contradiction between supply and demand of wood resources in my country. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a bamboo-wood plywood with a short production cycle, few hot pressing defects, suitable density and excellent mechanical properties, and a preparation method thereof.

[0011] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0012] A bamboo-wood plywood is formed by gluing a bamboo strip curtain layer, a wood veneer layer, a bamboo mat layer, and an impregnated paper layer. The wood veneer layer, the bamboo mat layer, and the impregnated paper layer are symmetrically arranged in sequence on both sides of the bamboo strip curtain layer. The bamboo strip curtain layer is woven from radial bamboo strips with green and yellow bamboo strips not removed, and the bamboo mat layer is woven from chordal bamboo strips with green and yellow bamboo strips removed, interweaving the warp and weft.

[0013] As a further improvement to the above technical solution:

[0014] The surface of the wood veneer layer is provided with grooves.

[0015] The density of the bamboo plywood is 0.6-0.75g / cm 3 , static bending strength is 95-110MPa, and nail holding force is 2200-2400N.

[0016] The thickness ratio of the bamboo strip curtain layer, the wood veneer layer, the bamboo mat layer and the impregnated paper layer is 1-3: 0.8-2.2: 0.8-1: 0.5-0.8.

[0017] As a general inventive concept, the present invention provides a method for preparing a bamboo plywood, comprising the following steps:

[0018] S1, taking raw bamboo materials and splitting them into bamboo strips, removing the green and yellow parts of a part of the bamboo strips and splitting them into chord-wise bamboo strips along the chord direction, weaving them into bamboo mats by interweaving the warp and weft, and directly splitting the other part of the bamboo strips along the radial direction into radial bamboo strips, weaving them into bamboo strip curtains; the radial bamboo strips include green bamboo strips and yellow bamboo strips;

[0019] S2, taking a wood veneer, rolling and etching the wood veneer, so that the surface of the wood veneer has grooves;

[0020] S3, drying the wood veneer, bamboo mat and bamboo strip curtain to a moisture content of 8-12%;

[0021] S4, aging or drying the wood veneer, bamboo mat and bamboo strip curtain after gluing;

[0022] S5, paving impregnated paper, bamboo mat, wood veneer, bamboo strip curtain, wood veneer, bamboo mat, and impregnated paper in order from bottom to top to assemble into a slab, placing it in a hot press that has been heated to a preset hot pressing temperature, and hot pressing and forming it once using a hot-in-hot-out hot pressing molding process, and directly discharging the material after pressure relief;

[0023] S6, cooling the discharged plate and then post-processing it.

[0024] As a further improvement to the above technical solution:

[0025] The step S4 specifically comprises the following steps:

[0026] Dipping the bamboo mat or bamboo strip curtain into the first adhesive, draining, and drying to a moisture content of 5-12%;

[0027] The wood veneer is coated with a second adhesive on both sides and then left to age.

[0028] The first adhesive has a solid content of 25-45%, a dynamic viscosity of 25-40 mPa·s, a water solubility of 7-9 times, and a dipping amount of 10-15%;

[0029] The second adhesive has a solid content of 35-45%, a dynamic viscosity of 125-200 mPa·s, and a coating amount of 150-300 g / m 2 .

[0030] In the step S5, the preset hot pressing temperature is 110-130°C, the pressure during hot pressing is 3-6MPa, and the hot pressing time is 0.8-1.5min / mm.

[0031] The pressure relief is staged, firstly reducing the maximum pressure to 2-4Mpa, then to 1-2Mpa, and finally to 0Mpa.

[0032] In step S2, the depth of the groove is 0.1-0.3 mm.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] 1. The bamboo-wood plywood of the present invention uses a wood veneer layer whose density is about half of that of bamboo. The wood veneer layer is laid between the bamboo mat layer and the bamboo strip curtain layer, which can effectively reduce the overall density and weight of the board, facilitate loading and unloading, and reduce transportation costs. At the same time, wood has a natural criss-cross cell arrangement structure in microstructure, while bamboo only has a longitudinally arranged cell structure. Laying a wood veneer layer between the bamboo mat layer and the bamboo strip curtain layer is conducive to improving the transverse strength of the board and increasing the nail holding force in the thickness direction of the board, thereby expanding the scope of application.

[0035] 2. The bamboo-wood plywood and preparation method thereof of the present invention comprises the following steps: the bamboo mat layer is woven by weaving bamboo strips in the chord direction in warp and weft, the bamboo wicker curtain layer is woven by weaving bamboo strips in the radial direction, the bamboo mat layer, the bamboo strip curtain layer and the wood veneer layer have obvious differences in macroscopic pore structure, mesoscopic pore structure and microscopic pore structure, and the multi-layer staggered structure formed by the three has porous airflow channels with more dimensions, and forms a multi-scale buffering effect during the load hot pressing process, which provides more porous structure space and time for the outward migration of moisture during the hot pressing process, prevents defects such as bubbling caused by excessive steam pressure due to obstruction of local moisture migration under the conditions of the hot-in-hot-out process, and lays the foundation for the feasibility of the hot-in-hot-out hot pressing molding process.

[0036] 3. After the surface of the wood veneer is rolled and etched by the bamboo-wood plywood and its preparation method of the present invention, micro grooves with full-dimensional distribution are formed on the surface of the wood veneer layer, which is conducive to forming a full-dimensional distribution of glue nail structures between the wood veneer layer and the bamboo mat layer and bamboo curtain layer, greatly improving the gluing performance of the wood veneer layer with the bamboo mat layer and bamboo curtain layer.

[0037] 4. The preparation method of the bamboo-wood plywood of the present invention adopts a one-time assembly, one-time hot pressing, hot-in-hot-out hot pressing molding process, which has the advantages of short production cycle, high hot pressing molding and production efficiency, low production cost, and is not prone to hot pressing defects such as bubbling. The obtained bamboo-wood plywood has appropriate density and excellent mechanical properties, and can be widely used in indoor and outdoor decoration, heavy-load packaging, building formwork and other fields.

[0038] 5. The bamboo-wood plywood of the present invention has a bamboo strip curtain layer woven from radial bamboo strips without removing the green and yellow bamboo strips, which improves the utilization rate of bamboo raw materials and reduces the process flow. In addition, the thickness of the radial bamboo strips is relatively thin, and the green and yellow bamboo strips are distributed on the left and right sides of the radial bamboo strips instead of the upper and lower wide sides, so that it will not have a significant impact on the hot pressing molding process and the molding quality of the board. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of embodiment 1 of the present invention.

[0040] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0041] Figure 3 It is a schematic structural diagram of a bamboo tube according to Embodiment 1 of the present invention.

[0042] Figure 4 yes Figure 3 Partial cross-sectional view at point B.

[0043] Figure 5 It is a schematic diagram of the component structure of the chord-wise thin bamboo strips of the present invention.

[0044] Figure 6 It is a schematic diagram of the component structure of radial bamboo strips in the present invention.

[0045] The numbers in the figure represent: 1. bamboo strip curtain layer; 2. wood veneer layer; 3. bamboo mat layer; 4. impregnated paper layer; 5. bamboo tube; 51. bamboo inner node; 52. bamboo yellow; 53. bamboo flesh; 54. bamboo green. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise specified, the instruments or materials used in the present invention are commercially available.

[0047] The invention discloses a bamboo-wood plywood, which is formed by gluing a bamboo strip curtain layer 1, a wood veneer layer 2, a bamboo mat layer 3 and an impregnated paper layer 4. The wood veneer layer 2, the bamboo mat layer 3 and the impregnated paper layer 4 are symmetrically arranged on both sides of the bamboo strip curtain layer 1 in sequence. The bamboo strip curtain layer 1 is woven by radial bamboo strips from which the green and yellow bamboo strips are not removed. The bamboo mat layer 3 is woven by warp and weft interweaving of chordal bamboo strips from which the green and yellow bamboo strips are removed. The bamboo mat layer 3 of the present invention is formed by weaving chord-wise bamboo strips in warp and weft, and the bamboo wicker curtain layer 1 is formed by weaving radial bamboo strips. The bamboo mat layer 3, the bamboo strip curtain 1 and the wood veneer layer 2 have obvious differences in macroscopic pore structure, mesoscopic pore structure and microscopic pore structure. The multi-layer staggered structure formed by the three has porous airflow channels with more dimensions, and forms a multi-scale buffering effect during the load hot pressing process, which provides more porous structure space and time for the outward migration of moisture during the hot pressing process, prevents defects such as bubbling caused by excessive steam pressure due to local moisture migration obstruction under the hot-in-hot-out process conditions, and lays the foundation for the feasibility of the hot-in-hot-out hot pressing molding process.

[0048] The surface of the wood veneer layer 2 is provided with grooves. The grooves are conducive to forming a fully-dimensionally distributed glue nail structure between the wood veneer layer 2 and the bamboo mat layer 3 and the bamboo curtain layer 1, which greatly improves the gluing performance of the wood veneer layer 2 and the bamboo mat layer 3 and the bamboo curtain layer 1.

[0049] Embodiment 1:

[0050] A method for preparing a bamboo plywood in this embodiment comprises the following steps:

[0051] (1) Preparation of tangential thin bamboo strips and radial thin bamboo strips: Select 6-year-old bamboo, cut and saw into bamboo tubes 5 after felling, and use a bamboo splitting machine to automatically split the bamboo tubes radially to obtain bamboo strips of a certain specification. Take a part of the bamboo strips, remove the inner nodes 51, bamboo green 52, and bamboo yellow 54, and cut them into bamboo strips along the tangential direction ( Figure 4 The strips are cut into chord-wise thin bamboo strips (the main component is bamboo flesh 53, as shown in the CC line in the middle) with a width of 20 mm and a thickness of 0.8 mm. Figure 5 Take another part of the bamboo strips, remove the bamboo inner section 51, do not need to remove the bamboo green 52, bamboo yellow 54, directly along the radial direction ( Figure 4 The DD line in the middle) is divided into radial bamboo strips with a width of 8 mm and a thickness of 3 mm (the main components include bamboo yellow 52, ​​bamboo flesh 53, and bamboo green 54, such as Figure 6 As shown), used for weaving radial bamboo curtains;

[0052] (2) Preparation of bamboo mats and radial bamboo curtains: Select chord-wise thin bamboo strips with a width of 20 mm and a thickness of 0.8 mm, and use a bamboo mat weaving machine to weave the bamboo mats by interweaving the warp and weft. The width is based on the product requirements. Use a bamboo curtain weaving machine to assemble radial bamboo strips with a width of 8 mm and a thickness of 3 mm horizontally with fine cotton thread into a whole bamboo curtain. The thickness and length of the bamboo curtain are the length and thickness of the radial bamboo strips themselves, and the width is the width of multiple radial bamboo strips after horizontal assembly. The width is based on the product requirements;

[0053] (3) Rolling and etching of the wood veneer surface: The veneer of the artificial forest fast-growing poplar wood was rolled with a spiked roller, with a thickness of 2.2 mm and an initial moisture content of 60%. After rolling, the surface of the wood veneer was covered with circular hole-like grooves with a diameter of 0.6 mm and a depth of 0.3 mm;

[0054] (4) Drying of bamboo mats, bamboo curtains and wood veneers: Dry the bamboo mats, bamboo curtains and wood veneers to a moisture content of 12% at a drying temperature of 90°C;

[0055] (5) Bamboo mats and bamboo curtains are dipped in glue: The bamboo curtains and bamboo curtains are dipped in glue. The adhesive used is a phenolic resin adhesive with a solid content of 45%, a dynamic viscosity of 40 mPa·s, and a water solubility of 9 times. The amount of dipped glue is controlled to be 15%, and the glue is drained after dipping;

[0056] (6) Gluing of wood veneer: Glue the poplar veneer with a thickness of 2.2 mm on both sides, with a glue coating amount of 300 g / m 2 The adhesive used is a phenolic resin adhesive with a solid content of 45% and a dynamic viscosity of 200 mPa·s. After the adhesive is applied, it is aged;

[0057] (7) Secondary drying of bamboo curtains and bamboo wicker curtains: The bamboo mats and bamboo wicker curtains are secondary dried, with the drying target moisture content being 12% and the drying temperature being 65°C;

[0058] (8) Paving assembly: adopt symmetrical structure for paving, and lay melamine impregnated paper, bamboo mat, wood veneer, radial bamboo strip curtain, wood veneer, bamboo mat, melamine impregnated paper in order from top to bottom, and the radial bamboo strip curtain is perpendicular to the wood veneer along the grain direction; the thickness of melamine impregnated paper is 0.8 mm, and the melamine content is 100%;

[0059] (9) Hot pressing: A hot-in-hot-out hot pressing process is used. Before the slab is assembled, the hot pressing plate is heated in advance. When the temperature of the hot pressing plate reaches 130°C, the slab is placed in the hot press. The hot pressing plate is then immediately closed and maintained at 6MPa for 1.5min / mm. After the pressure is maintained, the pressure is reduced in stages. The first stage is reduced from the highest pressure to 4Mpa, the second stage is reduced to 2Mpa, and the third stage is reduced to 0. The hot pressing plate is opened and the slab is unloaded to obtain the rough edge material of bamboo plywood.

[0060] (10) Trimming: After the rough edges of the wood are removed and cooled, a trimming machine is used to trim the four sides of the board to obtain bamboo plywood.

[0061] The poplar veneer, bamboo curtain and bamboo mat of Example 1 were assembled and hot-pressed into poplar plywood, bamboo curtain plywood and bamboo mat plywood according to the preparation method of Example 1, and the performance was tested with the bamboo plywood of Example 1.

[0062] Table 1 Performance comparison of bamboo plywood and other boards

[0063]

[0064] Embodiment 2:

[0065] A method for preparing a bamboo plywood in this embodiment comprises the following steps:

[0066] (1) Preparation of tangential thin bamboo strips and radial thin bamboo strips: Select 4-year-old bamboo, cut and saw into bamboo tubes 5 after felling, and use a bamboo splitting machine to automatically split the bamboo tubes 5 radially to obtain bamboo strips of a certain specification. Remove the inner nodes 51, green bamboo 52, and yellow bamboo 54 from the bamboo strips, and cut them into bamboo strips along the tangent direction ( Figure 4 The strips are cut into chord-wise thin bamboo strips (mainly bamboo flesh 53, as shown in the CC line in the middle) with a width of 10 mm and a thickness of 0.5 mm. Figure 5 Take another part of the bamboo strips, remove the bamboo inner section 51, do not need to remove the bamboo green 52, bamboo yellow 54, directly along the radial direction ( Figure 4 The direction shown by the DD line, such as Figure 6 As shown in the figure, the radial bamboo strips (mainly comprising yellow bamboo 52, bamboo flesh 53 and green bamboo 54) are split into radial bamboo strips with a width of 4 mm and a thickness of 1 mm, and are used for weaving radial bamboo strip curtains;

[0067] (2) Preparation of bamboo mats and radial bamboo curtains: Select chord-wise thin bamboo strips with a width of 10 mm and a thickness of 0.5 mm, and use a bamboo mat weaving machine to weave the bamboo mats by interweaving the warp and weft. The width is based on the product requirements. Use a bamboo curtain weaving machine to assemble radial bamboo strips with a width of 4 mm and a thickness of 1 mm horizontally with fine cotton thread into a whole bamboo curtain. The thickness and length of the bamboo curtain are the length and thickness of the radial bamboo strips themselves, and the width is the width of multiple radial bamboo strips after horizontal assembly. The width is based on the product requirements;

[0068] (3) Rolling and etching of the wood veneer surface: The veneer of the fast-growing eucalyptus wood from the plantation was rolled with a spiked roller, with a thickness of 0.8 mm and an initial moisture content of 25%. After rolling, the surface of the wood veneer was covered with circular hole-like grooves with a diameter of 0.3 mm and a depth of 0.1 mm.

[0069] (4) Drying of bamboo mats, bamboo curtains and wood veneers: Dry the bamboo mats, bamboo curtains and wood veneers to a moisture content of 8% at a drying temperature of 45°C;

[0070] (5) Gluing bamboo mats and bamboo wicker curtains: Gluing bamboo mats and bamboo wicker curtains is performed by gluing. The adhesive used is a medium-temperature fast-curing phenolic resin adhesive with a solid content of 25%, a dynamic viscosity of 25 mPa·s, and a water-soluble multiple of 7 times. The gluing amount is controlled to be 10%, and the gluing is drained after gluing.

[0071] (6) Gluing of veneer: Glue the eucalyptus veneer with a thickness of 0.8 mm on both sides, with a glue amount of 150 g / m 2 The adhesive used is a phenolic resin adhesive with a solid content of 35% and a dynamic viscosity of 125 mPa·s. After the adhesive is applied, it is aged;

[0072] (7) Secondary drying of bamboo mats and bamboo curtains: The bamboo mats and bamboo curtains are secondary dried, with a drying target moisture content of 5% and a drying temperature of 45°C;

[0073] (8) Paving assembly: adopt symmetrical structure for paving, and lay melamine impregnated paper, bamboo mat, wood veneer, radial bamboo strip curtain, wood veneer, bamboo mat, melamine impregnated paper in order from top to bottom, with the radial bamboo strip curtain being perpendicular to the wood veneer along the grain direction; the thickness of melamine impregnated paper is 0.8 mm, and the melamine impregnation amount is 70%;

[0074] (9) Hot pressing: A hot-in-hot-out hot pressing process is used. Before the slab is assembled, the hot pressing plate is heated in advance. When the temperature of the hot pressing plate reaches 110°C, the slab is placed in the hot press. The hot pressing plate is then immediately closed and maintained at 3MPa for a time of 0.8min / mm. After the pressure is maintained, the pressure is reduced in stages. The first stage is reduced from the highest pressure to 2Mpa, the second stage is reduced to 1Mpa, and the third stage is reduced to 0. The hot pressing plate is opened and the slab is unloaded to obtain the rough edge material of bamboo plywood.

[0075] (10) Trimming: After the rough edges of the wood are removed and cooled, a trimming machine is used to trim the four sides of the board to obtain bamboo plywood.

[0076] The poplar veneer, bamboo curtain and bamboo mat of Example 2 were respectively assembled and hot-pressed into poplar plywood, bamboo curtain plywood and bamboo mat plywood according to the preparation method of Example 2, and their performance was tested with the bamboo plywood of Example 2.

[0077] Table 2 Performance comparison of bamboo plywood and other boards

[0078]

[0079] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A bamboo plywood, characterized in that: The bamboo plywood is formed by gluing a bamboo strip curtain layer (1), a wood veneer layer (2), a bamboo mat layer (3), and an impregnated paper layer (4); the wood veneer layer (2), the bamboo mat layer (3), and the impregnated paper layer (4) are symmetrically arranged on both sides of the bamboo strip curtain layer (1) in sequence; the bamboo strip curtain layer (1) is woven from radial bamboo strips from which the green and yellow bamboo strips are not removed; and the bamboo mat layer (3) is woven from chordal bamboo strips from which the green and yellow bamboo strips are removed by warp and weft interweaving; The surface of the wood veneer layer (2) is provided with grooves.

2. The bamboo plywood according to claim 1, characterized in that: The density of the bamboo plywood is 0.6-0.75g / cm 3 , static bending strength is 95-110MPa, and nail holding force is 2200-2400N.

3. The bamboo plywood according to claim 1, characterized in that: The thickness ratio of the bamboo strip curtain layer (1), the wood veneer layer (2), the bamboo mat layer (3) and the impregnated paper layer (4) is 1-3: 0.8-2.2: 0.8-1: 0.5-0.

8.

4. A method for preparing the bamboo plywood according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, taking raw bamboo materials and splitting them into bamboo strips, removing the green and yellow parts of a part of the bamboo strips and splitting them into chord-wise bamboo strips along the chord direction, weaving them into bamboo mats by interweaving the warp and weft, and directly splitting the other part of the bamboo strips along the radial direction into radial bamboo strips, weaving them into bamboo strip curtains; the radial bamboo strips include green bamboo strips and yellow bamboo strips; S2, taking a wood veneer, rolling and etching the wood veneer, so that the surface of the wood veneer has grooves; S3, drying the wood veneer, bamboo mat and bamboo strip curtain to a moisture content of 8-12%; S4, aging or drying the wood veneer, bamboo mat and bamboo strip curtain after gluing; S5, paving impregnated paper, bamboo mat, wood veneer, bamboo strip curtain, wood veneer, bamboo mat, and impregnated paper in order from bottom to top to assemble into a slab, placing it in a hot press that has been heated to a preset hot pressing temperature, and hot pressing and forming it once using a hot-in-hot-out hot pressing molding process, and directly discharging the material after pressure relief; S6, cooling the discharged plate and then post-processing it.

5. The preparation method according to claim 4, characterized in that: The step S4 specifically comprises the following steps: Dipping the bamboo mat or bamboo strip curtain into the first adhesive, draining, and drying to a moisture content of 5-12%; The wood veneer is coated with a second adhesive on both sides and left to age.

6. The preparation method according to claim 5, characterized in that: The first adhesive has a solid content of 25-45%, a dynamic viscosity of 25-40 mPa·s, a water solubility of 7-9 times, and a dipping amount of 10-15%; The second adhesive has a solid content of 35-45%, a dynamic viscosity of 125-200 mPa·s, and a coating amount of 150-300 g / m 2 .

7. The preparation method according to claim 4, characterized in that: In the step S5, the preset hot pressing temperature is 110-130° C., the pressure during hot pressing is 3-6 MPa, and the hot pressing time is 0.8-1.5 min / mm.

8. The preparation method according to claim 7, characterized in that: The pressure relief is staged, firstly reducing the maximum pressure to 2-4Mpa, then to 1-2Mpa, and finally to 0Mpa.

9. The preparation method according to claim 7, characterized in that: In step S2, the depth of the groove is 0.1-0.3 mm.

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