Bamboo-wood-based stable structure body, stable structure body seam core plate and door plate structure

Abstract

The invention relates to a bamboo-wood-based stable structure body which comprises a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are attached and bonded alternately, and the plant fiber trend of the first bamboo-wood-based composite board is perpendicular to the bonding surface. The plant fiber trend of the second bamboo-wood-based composite board is parallel to the bonding surface, the plant fiber trend of the first bamboo-wood-based composite board is perpendicular to the plant fiber trend of the second bamboo-wood-based composite board after the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are bonded, and the thickness Q of the second bamboo-wood-based composite board and the thickness B of the adjacent first bamboo-wood-based composite board meet the following relation: 0 < Q < = 2 * a2 * B, the dry shrinkage rate range of the first bamboo-wood-based composite board in the thickness direction is (a1, a2); the solid wood stable structure seam core plate and the door plate structure are provided with expansion joints. According to the bamboo-wood-based stable structure body and the stable structure seam core board, the structural body which is stable in performance and not prone to deformation is formed by utilizing the trend of the plant fibers and the sawing seams, and the bamboo-wood-based stable structure body and the stable structure seam core board are widely applied to door boards, wall boards and decorative boards.

Description

Technical Field

[0001] The present invention relates to the field of wood-based panels, and particularly to a bamboo-wood based stable structure, a stable structure seam core board and a door panel structure. Background Art

[0002] Solid wood is an essential raw material in industries such as furniture and flooring. It has natural solid wood textures and solid wood textures, which cannot be replaced by other materials in home life. Naturally growing trees can be divided into two categories: hardwoods and softwoods. Hardwoods, due to their long growth cycle, limited available output, and tight wood texture and heavy quality, are often used in the production of high-end furniture. However, for most places, fast-growing woods such as pine are often used as lumber. And fast-growing woods, due to their rapid growth, have thick and soft plant growth fibers, which easily cause deformation during use, thus affecting the quality of the wood-based panels. Therefore, how to deal with the deformation of plants is an obstacle in the wood industry in the application of countertops, tabletops, and door panels in the field of home furniture. In addition, bamboo has the advantages of rapid post-growth, firm fibers, and small deformation, and is an excellent material to replace solid wood applications. Now, more and more bamboo is mixed with solid wood and has achieved good application effects.

[0003] Existing wooden countertops, tabletops, and door panels are divided into solid wood structures and composite glued wood structures. Compared with solid wood structures, composite glued wood structures have the characteristics of low price and relatively lower requirements for the specifications and quality of raw materials. Most of the existing core board materials use fast-growing softwoods as raw materials. These trees grow relatively fast, have thick plant fibers, and are relatively light in weight. However, during use, due to the relatively soft strength of the wood fibers themselves, the pressure-bearing performance during use is poor and deformation is likely to occur. And existing bamboo and bamboo-wood composite materials are prone to expansion and deformation, cracks and bulges, or deformation, which greatly affects their industrial applications, forcing people to choose hard hardwoods for production, thus greatly increasing the cost and often wasting fast-growing and high-yield softwoods and bamboos.

[0004] Patent Invention 202310662569.3 points out that if a composite wood-based panel structure with stable structure and long-lasting non-deformation is to be formed, the whole solid wood needs to be broken into pieces to form multiple solid wood blocks, and then the solid wood blocks are spliced to form a plate shape, and saw cuts are used to attract internal deformation to maintain the overall structural stability. However, through practice, there is still room for improvement in its deformation control and shrinkage. Therefore, we propose a deformation-resistant bamboo-wood based stable structure and a bamboo-wood based stable structure seam core board of the present invention. Summary of the Invention

[0005] The object of the present invention is to solve the problem in the prior art that the board is prone to deformation and difficult to control after deformation, resulting in overall deformation of the board, and a bamboo-wood-based stable structure, a stable structure seam core board and a door panel structure are proposed. The bamboo-wood-based stable structure of the present invention should be able to control the deformation amount and the overall shrinkage rate, so that the whole becomes a stable structure resistant to deformation, ensuring the structural stability of its use as a core board and other applications, and achieving stable anti-deformation performance and reduced weight.

[0006] In order to achieve the above object of the invention, the present invention patent provides the following technical solutions:

[0007] The present invention first provides a bamboo-wood-based stable structure, which includes multiple layers of thick laminates bonded together with an adhesive. The thick laminates are divided into a first bamboo-wood-based composite board and a second bamboo-wood-based composite board. The first bamboo-wood-based composite board and the second bamboo-wood-based composite board are alternately laminated by gluing. The plant fiber direction of the first bamboo-wood-based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood-based composite board is parallel to the bonding surface. After adjacent thick laminates are bonded, the plant fiber directions are perpendicular to each other. The thickness Q of the second bamboo-wood-based composite board and the thickness B of the adjacent first bamboo-wood-based composite board satisfy the following relationship:

[0008] 0 < Q ≤ 2 * a2 * B

[0009] Among them, the dry shrinkage rate range of the first bamboo-wood-based composite board in the thickness direction is (a1, a2).

[0010] Further, as a form of existence, the bamboo-wood-based stable structure includes a first basic unit, which includes a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, and the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are laminated by gluing.

[0011] Further, as another form of existence, the bamboo-wood-based stable structure includes a second basic unit, which includes two first bamboo-wood-based composite boards and a second bamboo-wood-based composite board, and the two first bamboo-wood-based composite boards sandwich the second bamboo-wood-based composite board and are laminated by gluing to form a sandwich structure.

[0012] Of course, in the above forms of existence of the bamboo-wood-based stable structure, one or more first basic units can exist alone and be laminated by gluing together, or one or more second basic units can exist alone and be laminated by gluing together, or a number of first basic units and second basic units can be laminated together.

[0013] In a bamboo-wood-based stable structure of the present invention, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are boards containing plant growth fibers, including wooden boards, wood-based multi-layer boards, bamboo boards, bamboo-based multi-layer boards, or bamboo-wood composite multi-layer boards.

[0014] Based on the bamboo-wood based stable structure, the present invention also designs and develops a bamboo-wood based stable structure seam core board structure. The bamboo-wood based stable structure seam core board structure includes multiple layers of thick laminates bonded together with an adhesive. The thick laminates are divided into a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are alternately glued and laminated. The plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface. After adjacent thick laminates are bonded, the plant fiber directions are perpendicular to each other; on the first bamboo-wood based composite board, expansion joints are opened along the plant growth fiber direction.

[0015] Further, in a bamboo-wood based stable structure seam core board structure of the present invention, on the first bamboo-wood based composite board, a plurality of parallel expansion joints are opened, and the front surface of the first bamboo-wood based composite board with the expansion joint openings is the hard core surface.

[0016] In a bamboo-wood based stable structure seam core board structure of the present invention, further, cross joints are also opened on the first bamboo-wood based composite board. The cross joints are opened along the plant growth fiber direction and are arranged crosswise with the expansion joints. The existence form of the cross joints is the same as that of the expansion joints, both are opened on the first bamboo-wood based composite board along the plant growth fiber direction by a saw blade. If the cross joints and the expansion joints are perpendicularly crossed, transverse expansion joints and longitudinal expansion joints are formed on the outer surface of the first bamboo-wood based composite board.

[0017] In a bamboo-wood based stable structure seam core board structure of the present invention, further, the opening density of the expansion joints and the cross joints decreases from the center to the periphery, forming a gradient hard core surface on the first bamboo-wood based stable structure seam core board. Conventionally, it decreases towards the periphery. At this time, the surface board of the hard core surface of the seam core board is an ordinary wooden panel, and the purpose is to reduce deformation. However, if other materials are used, it may also increase. Such materials may be plastic, stainless steel, etc., and the purpose is also to reduce deformation.

[0018] In a bamboo-wood based stable structure seam core board structure of the present invention, further, the expansion joints are divided into three types according to the opening depth and position: the first type of expansion joint is entirely opened on the first bamboo-wood based composite board, and the end of the first type of expansion joint is close to the bonding surface, which is called type A seam; the second type of expansion joint penetrates the first bamboo-wood based composite board to the bonding surface, and there is no expansion joint on the second bamboo-wood based composite board, which is called type B seam; the third type of expansion joint penetrates the first bamboo-wood based composite board and extends into the second bamboo-wood based composite board, and there is an expansion joint on the second bamboo-wood based composite board, which is called type C seam.

[0019] In a bamboo-wood-based stable structure and seam core board structure of the present invention, its composition includes a first basic unit and / or a second basic unit. The first basic unit is made by laminating and gluing a first bamboo-wood-based composite board and a second bamboo-wood-based composite board. The second basic unit is made by laminating and gluing two first bamboo-wood-based composite boards and a second bamboo-wood-based composite board, and the first bamboo-wood-based composite boards on both sides in the second basic unit and the second bamboo-wood-based composite board in the middle form a sandwich structure.

[0020] In a bamboo-wood-based stable structure and seam core board structure of the present invention, further, it is composed of at least one of the first basic units. Multiple A-type seams are opened on the hard core surface of the first basic unit. Using the hard core surface as the core surface of a three-ply board and using the second bamboo-wood-based composite board as the back board, it is laminated and glued with a panel covering the hard core surface to form a three-ply board, which is called a single-layer column core board.

[0021] In a bamboo-wood-based stable structure and seam core board structure of the present invention, further, it is composed of at least one of the second basic units. Multiple B-type seams and cross seams arranged in a cross state with the B-type seams are opened on the bonding surface of the first bamboo-wood-based composite board. The hard core surface of the first bamboo-wood-based composite board is divided by the B-type seams and the cross seams into geometric bodies that are not connected to each other and are uniformly bonded to the second bamboo-wood-based composite board, forming a double-layer geometric body on both sides of the second bamboo-wood-based composite board. Using the hard core surface where the double-layer geometric body is located as the board core surface, and using two panels to cover the board core surface respectively and laminating and gluing them to form a large board, which is called a double-layer column core board.

[0022] In a bamboo-wood-based stable structure seam core board structure of the present invention, further, the bamboo-wood-based stable structure seam core board structure is composed of the first basic unit or the second basic unit. A plurality of C-shaped seams and cross seams are provided on the first bamboo-wood-based composite board. The hard core surface of the first bamboo-wood-based composite board is divided into several independent geometric bodies by the C-shaped seams and cross seams. Part of the plant growth fibers of the second bamboo-wood-based composite board are cut off by the C-shaped seams and cross seams to form a support bending surface. The support bending surface with independent geometric bodies is laminated with a surface board glue layer provided on a curved surface mold to form a curved panel, which is called a curved surface column core board. If it is the first basic unit, the first bamboo-wood-based composite board is divided into several independent geometric bodies, and the second bamboo-wood-based composite board forms a support bending surface. At this time, the support bending surface with independent geometric bodies is laid on the curved surface mold, so that the independent geometric bodies of the first bamboo-wood-based composite board face outwards, and a curved surface shape the same as that of the curved surface mold is presented at the hard core surface. At this time, a bendable surface board is covered on the hard core surface and formed into one body through glue lamination. The final product is called a single-layer column core board. If it is the second basic unit, since there are cross seams intersecting with the expansion joints on the first bamboo-wood-based composite board, the hard core surface of the first bamboo-wood-based composite board is divided into several independent geometric bodies by the expansion joints and cross seams. Part of the plant growth fibers of the second bamboo-wood-based composite board are cut off by the expansion joints and cross seams to form a support bending surface. The grid body stable structure hard surface of one first bamboo-wood-based composite board is placed on a bendable surface board, and the bendable surface board is arranged in a curved surface mold. Another bendable surface board is covered on the grid body stable structure hard surface of another first bamboo-wood-based composite board. The two bendable surface boards and the second basic unit are bonded and laminated to form a curved panel, which is called a double-layer curved surface column core board.

[0023] In a bamboo-wood-based stable structure seam core board structure of the present invention, further, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are boards containing plant growth fibers, including wooden boards, wood-based multi-layer boards, bamboo boards, bamboo-based multi-layer boards, or bamboo-wood composite multi-layer boards.

[0024] In a bamboo-wood-based stable structure seam core board structure of the present invention, further, a functional core layer is also provided in the second bamboo-wood-based composite board, and the functional core layer is one or more of a heat-insulating and heat-preserving polyurethane board, a metal board, a fireproof board, a glass fiber woven layer, and a carbon fiber woven layer.

[0025] Based on the bamboo-wood based stable structure and the bamboo-wood based stable structure core board, the present invention further provides a door panel structure. The door panel structure includes a bamboo-wood based stable structure core board structure formed by combining a first bamboo-wood based composite board and a second bamboo-wood based composite board. The first bamboo-wood based composite board and the second bamboo-wood based composite board are alternately glued and laminated. The plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface. After the adjacent thick laminates are bonded, the plant fiber directions are perpendicular to each other; on the first bamboo-wood based composite board, a plurality of parallel expansion joints and cross joints intersecting with the expansion joints are provided. Both the expansion joints and the cross joints are opened along the plant growth fiber direction. The front surface of the first bamboo-wood based composite board with the expansion joints and the cross joint openings is the hard core surface; a panel is provided on the hard core surface, and a frame is provided around the bamboo-wood based stable structure core board.

[0026] In a door panel structure of the present invention, the arrangement density of the expansion joints and the cross joints provided on the first bamboo-wood based composite board has a gradually increasing gradient from the inside to the outside.

[0027] In a door panel structure of the present invention, further, the arrangement density of the expansion joints and the cross joints has a gradually increasing gradient from the inside to the outside, and the density increase amplitude of adjacent gradients is greater than 10%.

[0028] Based on the above technical solutions, compared with the prior art, the bamboo-wood based stable structure, the stable structure core board and the door panel structure provided by the present invention have the following technical advantages:

[0029] 1. Based on the requirements of anti-deformation and low shrinkage rate, the present invention proposes the concept of a stable structure, which covers the applications of bamboo-based boards and solid wood boards. According to the characteristics that the dry shrinkage rates are different in different plant fiber directions, the dry shrinkage rate is combined with the external dimensions to enable its comprehensive performance to meet its application requirements. Specifically, the plant fiber direction with a low dry shrinkage rate is used as the stressed part, and it is used as a support to achieve the purpose of anti-deformation. The direction with a high dry shrinkage rate is used as the elastic part, so as to realize the stability of the overall dimensions, and ensure the long-term stability of the external shape by absorbing the dry shrinkage deformation inside.

[0030] 2. The stable structure core board of the present invention uses the opening of expansion joints and cross joints to divide the combination of the first bamboo-wood composite board and the second bamboo-wood composite board into two basic units, that is, one first bamboo-wood composite board is adhesively fixed to one second bamboo-wood composite board. Expansion joints are opened on the first bamboo-wood composite board, and the side with the expansion joints is called the grid body stable structure hard surface. The growth direction of plant fibers on the first bamboo-wood composite board is perpendicular to this grid body stable structure hard surface. By opening multiple expansion joints and cross joints on the first bamboo-wood composite board, a stable board form is formed. If the thickness is sufficient, it can be used as a door core board or other decorative panel materials by covering the surface board. It has the characteristics of strong support force and not easy to deform, and can also be made lightweight by grooving. If the thickness is controlled and the second bamboo-wood composite board is used as the floor and the surface board is used as the upper surface board of the floor, a floor structure with stable structure and strong support force is formed. Another way is to form a sandwich structure by clamping one second bamboo-wood composite board with two first bamboo-wood composite boards. By opening multiple expansion joints and cross joints on the first bamboo-wood composite board, a stable board form is formed, and it can also be used as a door core board or other decorative panel materials by covering the surface board.

[0031] 3. According to the depth of the expansion joints and cross joints of the stable structure core board of the present invention and their relationship with the second bamboo-wood composite board, three forms of expansion joints, namely A, B, and C, are formed. Among them, a single basic unit with A-type joints can be directly made into a three-ply board, and the second basic unit with A-type joints or B-type joints can be made into a three-ply board or a double-layer column core board. The first basic unit or the second basic unit with C-type joints and cross joints can be made into a curved surface column core board. Therefore, in addition to flat boards, the stable structure core board can also be curved surface boards, greatly expanding its application fields.

[0032] 4. When the stable structure core board is used as a door panel, crossed expansion joints and cross joints are designed, so that the first bamboo-wood composite board among them is broken into geometric columns along the direction of plant growth fibers. The volume of the first bamboo-wood composite board is greatly reduced through the gaps, but the support force can be ensured by the upright plant growth fibers. In order to further reduce the deformation caused by stress, the opening density of the expansion joints and cross joints of the first bamboo-wood composite board in the stable structure core board is also limited. Under the condition of the same surface material, the opening density in the middle should be less than that near the edge, so that the deformation stress near the edge of the door panel is smaller than that in the middle, ensuring that the overall door panel is more stable and not easy to deform. Description of the Drawings

[0033] Figure 1 It is a top view schematic diagram of the structural composition of a stable structure unit of the present invention.

[0034] Figure 2It is a schematic diagram of the three-dimensional structure of a stable structure unit of the present invention.

[0035] Figure 3 It is a schematic diagram of the glued laminated large board in the present invention.

[0036] Figure 4 It is a schematic diagram of the glued laminated column formed by decomposing the glued laminated large board in the present invention.

[0037] Figure 5 It is a schematic diagram of the integrated straight-grained board formed by longitudinally decomposing the glued laminated column in the present invention.

[0038] Figure 6 It is a schematic diagram of the integrated cross-cut board formed by transversely decomposing the glued laminated column in the present invention.

[0039] Figure 7 It is a schematic diagram of the stable structure formed by the integrated straight-grained board and the integrated cross-cut board in the present invention.

[0040] Figure 8 It is a schematic diagram of the preparation process of the stable structure core board in the present invention.

[0041] Figure 9 It is a cross-sectional schematic diagram of the second basic unit in the stable structure seam core board of the present invention.

[0042] Figure 10 It is a processing schematic diagram of a longitudinal expansion joint on the stable structure column at an angle in the present invention.

[0043] Figure 11 It is a processing schematic diagram of the longitudinal expansion joint on the stable structure column at another angle in the present invention.

[0044] Figure 12 It is a processing schematic diagram of the longitudinal and transverse expansion joints in the second basic unit of the stable structure seam core board of the present invention.

[0045] Figure 13 It is a schematic diagram of the second basic unit of the stable structure seam core board covered with double-sided decorative panels in the present invention.

[0046] Figure 14 It is a schematic diagram of the second basic unit of the stable structure seam core board covered with double-sided decorative panels and side plates in the present invention.

[0047] Figure 15 It is a cross-sectional schematic diagram of the first basic unit in the stable structure seam core board of the present invention.

[0048] Figure 16 It is a processing schematic diagram of the longitudinal and transverse expansion joints in the first basic unit of the stable structure seam core board of the present invention.

[0049] Figure 17It is a partial sectional view of the first basic unit in the stable structure core board of the present invention.

[0050] Figure 18 It is a schematic diagram of the first basic unit of the stable structure core board of the present invention covered with a single-sided decorative panel. Detailed implementation manners

[0051] Next, we will further elaborate on a bamboo-wood-based stable structure, its preparation process, and a bamboo-wood-based core board of the present invention in combination with the attached drawings and specific embodiments, in order to more clearly understand its structural composition and working mode, but the protection scope of the present invention cannot be limited thereby.

[0052] The present invention constructs a large class of structural types of bamboo-wood-based boards as a whole, so as to give full play to the performance advantages of solid wood. Based on the plant growth fiber direction of trees, it avoids or overcomes its performance disadvantages, gives full play to the supporting performance in the plant fiber direction, and fully demonstrates its anti-deformation ability, opening up a broad world for the application of solid wood and bamboo-wood.

[0053] As Figure 1 and Figure 2 shown, the present invention first provides a concept of a bamboo-wood-based stable structure, which processes solid wood boards, or bamboo, or bamboo-wood composite materials into a structure-stable and anti-deformation structure body. The bamboo-wood-based stable structure body includes multiple layers of thick laminates bonded together with an adhesive. The thick laminates are divided into two types: the first bamboo-wood-based composite board 1 and the second bamboo-wood-based composite board 2. Both types are boards made by the method of laminated gluing. The first bamboo-wood-based composite board 1 and the second bamboo-wood-based composite board 2 are alternately laminated by gluing. The plant fiber direction of the first bamboo-wood-based composite board 1 is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo-wood-based composite board 2 is parallel to the bonding surface. After adjacent thick laminates are bonded, the adjacent plant fiber directions are perpendicular to each other. In addition, in terms of dimensional relationship, the thickness Q of the second bamboo-wood-based composite board 2 and the thickness B of the adjacent first bamboo-wood-based composite board 1 satisfy the following relationship:

[0054] 0 < Q ≤ 2 * a2 * B

[0055] Among them, the first bamboo-wood-based composite board 1 is a cross-cut board, and the dry shrinkage rate range of the first bamboo-wood-based composite board in the thickness direction is (a1, a2). In the made bamboo-wood-based stable structure body, both end faces of the bamboo-wood-based stable structure body are stable structure soft faces.

[0056] The above-mentioned drying shrinkage rate refers to the proportion of the size reduction of trees (wood) during the drying process due to the reduction of moisture. For wood, the ratio of the drying shrinkage size to the original size along the wood grain direction is relatively small, only 0.1%-0.3%, which is called the longitudinal drying shrinkage rate; the transverse drying shrinkage rate is further divided into the radial drying shrinkage rate and the tangential drying shrinkage rate. The radial drying shrinkage rate is the ratio of the drying shrinkage size along the diameter direction on the cross-section to the original radial size, usually 3%-6%. The tangential drying shrinkage rate is the ratio of the drying shrinkage size along the tangent direction of the annual ring to the original tangential size, and the value is 6%-12%, which is 1-2 times that of the radial drying shrinkage rate. The above-mentioned longitudinal drying shrinkage rate and transverse drying shrinkage rate are linear drying shrinkage rates. In addition, there is also the volume drying shrinkage rate, which refers to the ratio of the reduction amount after wood drying to the original volume, usually varying between 1%-12%. Similarly, there is also the rule that the drying shrinkage rate along the wood grain direction is small. The internal stress caused by drying shrinkage deformation is called the drying shrinkage force, which will cause phenomena such as warping, deformation, and cracking of wood, affecting the processing and use performance of wood. The bamboo-wood based stable structure takes into account the concept of the drying shrinkage rate, the drying shrinkage rate and the drying shrinkage size and the original size, and proposes the corresponding relationship between the thickness of the solid wood board and the directions of different plant fibers, so as to minimize the drying shrinkage rate along the direction of the plant fiber, control the deformation amount and the drying shrinkage force of the bamboo-wood based stable structure in this direction to the minimum, and achieve no deformation.

[0057] In the above-mentioned bamboo-wood based stable structure, the first bamboo-wood based composite board and the second bamboo-wood based composite board are boards containing plant growth fibers, including pure wood multi-layer boards, pure bamboo multi-layer boards, or bamboo-wood composite multi-layer boards. For the wood-based stable structure, or the bamboo-based stable structure, or the bamboo-wood stable structure, the solid wood block is usually a laminated board made of multiple layers of solid wood. Of course, it can also be a single solid wood board, but usually the size specifications do not meet the requirements, which also limits the source of materials. In addition to solid wood boards, laminated boards made of bamboo can also be selected, or laminated boards made of alternating layers of solid wood and bamboo can be used. The most crucial point of the bamboo-wood based stable structure is to combine at least two solid wood boards together, and the directions of the plant growth fibers of the two should be perpendicular, and the direction of the plant growth fibers should be combined and evaluated with the bonding surface of the two. The same rule applies to bamboo, or after bamboo and solid wood are combined, they can also be used as the material sources of the first bamboo-wood based composite board and the second bamboo-wood based composite board.

[0058] For the above-mentioned bamboo-wood based stable structure or solid wood stable structure, its structural composition is special. There are various preparation processes for this bamboo-wood based stable structure. One of the preparation processes of the bamboo-wood based stable structure is as follows. In the case, solid wood boards are selected. Of course, they can also be replaced with boards made of bamboo, or boards made of bamboo-wood composite:

[0059] First step: Stack multiple solid wood boards with the same length, width, and the same plant fiber direction in the thickness direction and then bond and laminate them together to form a glued laminated wood board with the same plant fiber direction, as shown in Figure 3 . After this glued laminated wood board is flipped by 90 degrees, the plant fiber directions are the same, and its upper and lower surfaces form planes due to the same width. Of course, these planes can also be processed smoother by planing or grinding to form multiple glued laminated wood boards of unified specifications for subsequent processing operations.

[0060] Second step: As shown in Figure 4 , saw the above-mentioned glued laminated wood board along the width direction to form multiple glued laminated wood cylinders with equal thickness. In this glued laminated wood cylinder, the plant fiber direction is perpendicular to the height direction, and at the end face of the glued laminated wood cylinder, the plant fiber direction is perpendicular to the length direction of the glued laminated wood cylinder and parallel to the width direction of the glued laminated wood cylinder. Use the glued laminated wood cylinder as the basis for subsequent processing of the first solid wood board and the second solid wood board.

[0061] Third step: As shown in Figure 5 , saw a part of the glued laminated wood cylinder along the length L direction and the height H direction to form an integrated straight-grained board as the first solid wood board. In the first solid wood board, the plant fiber direction is perpendicular to the upper and lower surfaces, that is, the plant fiber directions in the first solid wood board are all parallel to the thickness direction.

[0062] Fourth step: As shown in Figure 6 , saw another part of the glued laminated wood cylinder along the width W direction and the height H direction to form an integrated cross-cut board as the second solid wood board. In the integrated cross-cut board, the plant fiber direction is parallel to the upper and lower surfaces, that is, the plant fiber directions in the integrated cross-cut board are all perpendicular to the thickness direction.

[0063] Fifth step: As shown in Figure 7 , stack two integrated straight-grained boards and one integrated cross-cut board together and bond and glue them at the contact surface to form a stable structure cylinder composed of two first solid wood boards clamping one second solid wood board. In this stable structure cylinder, the plant fiber directions of the two integrated straight-grained boards on both sides are perpendicular to the plant fiber direction of the integrated cross-cut board, and one end of the plant fibers of the two integrated straight-grained boards on both sides are respectively perpendicular to and in contact with the two side surfaces of the integrated cross-cut board.

[0064] Sixth step: According to different application scenarios, it can also be sawed along the height direction of the stable structure cylinder to form multiple stable structure unit with equal thickness. In this stable structure unit, the inner side surfaces of the two integrated straight-grained boards (the first solid wood boards) on both sides are respectively connected to the two sides of the middle integrated cross-cut board (the second solid wood board). The plant fibers of the middle integrated cross-cut board are parallel to the bonding surface, and the plant fibers of the two integrated straight-grained boards on both sides are perpendicular to the bonding surface, and its end face is as shown in Figure 1 .

[0065] The above process flow can be Figure 8 detailedly represented, reflecting the differences from the existing processes. Under the new concept and idea of the bamboo-wood based stable structure, taking the solid wood board as an example, each stable structure unit becomes an independent structure. After designing the upper and lower surface boards, multiple stable structure units are laid and spliced on the lower surface board to form a core board, and then the upper surface board is covered and bonded, thus forming a composite solid wood board structure with stable structure and not easy to deform. The solid wood board is divided into parts, making full use of the different directions of plant growth fibers, resulting in different directions. By adjusting the direction and applying the dry shrinkage rate, considering the relationship between the dry shrinkage rate and the corresponding size, precise control of deformation is achieved, and the composite solid wood board structure is stable and reliable.

[0066] As the most commonly used stable structure form, the bamboo-wood based stable structure is composed of three thick laminates to form a basic unit. The first bamboo-wood based composite board 1 and the second bamboo-wood based composite board 2 are bonded and glued to form the basic unit of the stable structure. This basic unit is formed by sandwiching a second bamboo-wood based composite board 2 between two first bamboo-wood based composite boards 1 to form a laminated large board. In addition, there is also a situation where the bamboo-wood based stable structure is composed of two thick laminates to form a basic unit. The first bamboo-wood based composite board and the second bamboo-wood based composite board are bonded and glued to form the basic unit of the stable structure. This basic unit is formed by laminating a second bamboo-wood based composite board against a first bamboo-wood based composite board, but it is required that the direction of the plant growth fibers of the first bamboo-wood based composite board is perpendicular to the bonding surface. In terms of size, the length of the first bamboo-wood based composite board 1 occupies a relatively large size proportion, so that the deformation amount in one direction on the surface can be controlled, and the deformation amount in the other direction can be controlled by being perpendicular to the surface board. Making full use of the direction of the plant fibers of the tree, a stable structure with controllable deformation amount is formed in one direction, so it is called the bamboo-wood based stable structure. For the other direction perpendicular to it, subsequent operations of expansion joints are required to control the dry shrinkage rate, so as to achieve a stable structure with controllable overall deformation. According to common tree knowledge, for a tree, the anti-deformation ability in the direction of plant fiber is ten times or more than that in the side deformation direction. Therefore, in daily applications, the tree growth direction, that is, the direction of plant fibers, is used as the direction of the supporting force, which can bear pressure and tension, that is, "one piece of wood can withstand a thousand catties".

[0067] Based on the above bamboo-wood based stable structure, the present invention also provides a bamboo-wood based stable structure seam core board structure, as shown in Figure 12 and Figure 16As shown in the figure, the bamboo-wood based stable structure joint core board structure at least includes a first bamboo-wood based composite board and a second bamboo-wood based composite board, and the first bamboo-wood based composite board and the second bamboo-wood based composite board are laminated and bonded alternately; the plant fiber direction of the first bamboo-wood based composite board is perpendicular to the bonding surface, the plant fiber direction of the second bamboo-wood based composite board is parallel to the bonding surface, the inner sides of the first bamboo-wood based composite boards on both sides are respectively connected to the two side surfaces of the second bamboo-wood based composite board, and the plant fiber direction of the first bamboo-wood based composite board is perpendicular to the plant fiber direction of the second bamboo-wood based composite board; a plurality of expansion joints are opened on the first bamboo-wood based composite board, and the expansion joints are opened along the plant fiber direction of the first bamboo-wood based composite board and extend to the second bamboo-wood based composite board.

[0068] Further, the above-mentioned bamboo-wood based stable structure joint core board structure includes two types, namely a first basic unit and a second basic unit, as Figure 9 and Figure 15 . The finished bamboo-wood based stable structure joint core board can be composed of the first basic unit or the second basic unit.

[0069] The above-mentioned expansion joints are divided into three types according to the opening depth and position: the first type of expansion joint is entirely opened on the first bamboo-wood based composite board, and the end of the first type of expansion joint is close to the bonding surface, which is called type A joint; the second type of expansion joint penetrates the first bamboo-wood based composite board to the bonding surface, and there is no expansion joint on the second bamboo-wood based composite board, which is called type B joint; the third type of expansion joint penetrates the first bamboo-wood based composite board and extends into the second bamboo-wood based composite board, and there is an expansion joint on the second bamboo-wood based composite board, which is called type C joint.

[0070] As the first application form, the bamboo-wood based stable structure joint core board structure is composed of at least one of the above-mentioned first basic units. A plurality of type A joints are opened on the hard core surface of the first basic unit. Using the hard core surface as the core surface of the three-ply board and using the second bamboo-wood based composite board as the back board, it is laminated and glued with the panel covering the hard core surface to form a three-ply board, which is called a single-layer column core board.

[0071] As the second application form, the bamboo-wood based stable structure joint core board structure is composed of at least one of the second basic units. A plurality of type B joints and cross joints arranged in a cross state with the type B joints are opened on the bonding surface of the first bamboo-wood based composite board. The hard core surface of the first bamboo-wood based composite board is divided into geometric bodies that are not connected to each other and are uniformly bonded to the second bamboo-wood based composite board by the type B joints and the cross joints, forming a double-layer geometric body arranged on both sides of the second bamboo-wood based composite board. Using the hard core surface where the double-layer geometric body is located as the core surface of the board, and using two panels to cover the core surface of the board respectively and laminating and gluing them to form a large board, which is called a double-layer column core board.

[0072] As a third application form, the bamboo-wood based stable structure seam core board structure is composed of the first basic unit or the second basic unit. A plurality of C-shaped seams and cross seams are provided on the first bamboo-wood based composite board. The hard core surface of the first bamboo-wood based composite board is divided into several independent geometric bodies by the C-shaped seams and cross seams. Part of the plant growth fibers of the second bamboo-wood based composite board are cut off by the C-shaped seams and cross seams to form a supporting curved surface. The supporting curved surface with independent geometric bodies is laminated with the surface board provided on the curved surface mold through glue to form a curved panel, which is called a curved surface column core board.

[0073] In the curved surface column core board, if there is only the first basic unit, the first bamboo-wood based composite board is divided into several independent geometric bodies, and the second bamboo-wood based composite board forms a supporting curved surface. At this time, the supporting curved surface with independent geometric bodies is laid on the curved surface mold, so that the independent geometric bodies of the first bamboo-wood based composite board face outwards, and a curved surface shape the same as that of the curved surface mold is presented at the hard core surface. At this time, the bendable surface board is covered on the hard core surface and laminated into one body through glue, and the final product is called a single-layer column core board.

[0074] In the curved surface column core board, if there is only the second basic unit, since cross seams intersecting with the expansion joints are provided on the first bamboo-wood based composite board, the hard core surface of the first bamboo-wood based composite board is divided into several independent geometric bodies by the expansion joints and cross seams. Part of the plant growth fibers of the second bamboo-wood based composite board are cut off by the expansion joints and cross seams to form a supporting curved surface. The grid body stable structure hard surface of one first bamboo-wood based composite board is placed on a bendable surface board, and the bendable surface board is arranged in the curved surface mold. Another bendable surface board is covered on the grid body stable structure hard surface of another first bamboo-wood based composite board. The two bendable surface boards and the second basic unit are bonded and laminated into a curved panel, which is called a double-layer curved surface column core board.

[0075] As Figure 15 shown, the first basic unit is made by laminating and gluing a first bamboo-wood based composite board and a second bamboo-wood based composite board. A plurality of parallel expansion joints along the direction of plant fibers are provided on the first bamboo-wood based composite board. The front surface of the first bamboo-wood based composite board with the expansion joint openings is the stable structure hard surface of the seam core board. As Figure 16 and 17As shown, in the first basic unit, a cross seam intersecting with the expansion joint is further provided on the first bamboo-wood composite board. The cross seam and the expansion joint appear on the stable structure hard surface of the grid body. A panel is covered on the stable structure hard surface of the first bamboo-wood composite board. The second bamboo-wood composite board serves as the bottom board and is parallel to the panel. The existence form of the cross seam here is to intersect with the expansion joint at a certain angle. If they intersect vertically, a transverse expansion joint is formed, and a phenomenon of the coexistence of longitudinal and transverse expansion joints appears on the first basic unit. Due to the existence of the longitudinal and transverse expansion joints, the actual volume of the first bamboo-wood composite board is greatly reduced, and the dry shrinkage rate is also greatly reduced. However, since the expansion joints all exist along the direction of plant growth fibers, its support strength remains the maximum, and the anti-deformation force is also the maximum, enabling the stable structure hard surface to have sufficient support force and anti-deformation ability.

[0076] When the first basic unit serves as the bamboo-wood stable structure joint core board, at least one side of its four sides is provided with a side board. Of course, side boards can be arranged on opposite sides for enclosure, or side boards can be arranged on three sides for enclosure. Most commonly, side boards are designed on all four sides for enclosure, so as to form a frame-shear structure. The side is an adjacent side perpendicular to the stable structure hard surface.

[0077] Similarly, in the second basic unit, a sandwich structure is formed by clamping a second bamboo-wood composite board 2 with two first bamboo-wood composite boards 1. A cross seam 4 intersecting with the expansion joint 3 is further provided on the first bamboo-wood composite board 1. The cross seam 4 and the expansion joint 3 appear on the stable structure hard surface of the grid body. Side boards 6 are provided on the surrounding sides of the second basic unit to form a frame-shear structure. A panel 5 can also be covered on the stable structure hard surface of the first bamboo-wood composite board, as Figure 13 and Figure 14 shown.

[0078] In the structural forms of the first and second basic units, planar expansion can be realized, thereby increasing the area of the stable structure hard surface and expanding the size according to the product size requirements. In this way, it can be used as the core board of the floor, and only need to bond the floor surface board on the stable structure hard surface to form. The second solid wood therein becomes the bottom board of the floor. Of course, its application scenarios also include door core boards and decorative boards, etc.

[0079] A functional core layer is further provided in the second bamboo-wood composite board. The functional core layer is one or more of a heat-insulating and heat-preserving polyurethane board, a metal board, a fireproof board, a glass fiber woven layer, and a carbon fiber woven layer. By setting the functional core layer, on the one hand, the stability can be increased, and the structure of the laminated board can also be enriched to provide heat insulation, fire resistance and other properties. Taking the double-layer column core board as an example, if a functional core layer such as a heat-insulating and heat-preserving polyurethane board is added to the second bamboo-wood composite board, the double-layer column core board will increase its function and become a double-layer heat-preserving column core board.

[0080] Example 1

[0081] This example belongs to a composite board structure made of the second basic unit. As shown in Figure 9 , the second basic unit is made by laminating and gluing two first bamboo-wood based composite boards and one second bamboo-wood based composite board, and the first bamboo-wood based composite boards on both sides in the second basic unit and the second bamboo-wood based composite board in the middle form a sandwich structure. A plurality of parallel expansion joints are provided on the first bamboo-wood based composite board along the direction of plant fibers. The front surface of the first bamboo-wood based composite board with the expansion joint opening is the stable structure hard surface M of the seam core board. For the stable structure hard surface M, it is the surface perpendicular to the plant growth fibers, has relative supporting force and anti-deformation ability, and the corresponding dry shrinkage rate is relatively small, so it is a hard surface. Figure 10 And Figure 11 show the state of the second basic unit with expansion joints opened.

[0082] In the above-mentioned second basic unit, cross joints intersecting with the expansion joints are further provided on the first bamboo-wood based composite board. The cross joints and the expansion joints appear on the stable structure hard surface of the grid body. Side plates are provided around the second basic unit to form a frame-shear structure, and a panel is covered on the stable structure hard surface of the grid body of the first bamboo-wood based composite board.

[0083] As shown in Figure 12 And Figure 13 , a layer of first bamboo-wood based composite board is adhesively connected to both thickness sides of the second bamboo-wood based composite board respectively. To more clearly understand the content of this example, a three-dimensional coordinate system is established with the width direction of the first bamboo-wood based composite board and the second bamboo-wood based composite board as the x-axis, the length direction of the first bamboo-wood based composite board and the second bamboo-wood based composite board as the y-axis, and the thickness direction of the first bamboo-wood based composite board and the second bamboo-wood based composite board as the z-axis.

[0084] The first bamboo-wood based composite board is provided with criss-cross expansion joints and cross joints on the opposite surface adhesively connected to the second bamboo-wood based composite board. The expansion joints run through both length sides of the first bamboo-wood based composite board along the y-axis direction, and the cross joints run through both width sides of the first bamboo-wood based composite board along the x-axis direction. A number of expansion joints are evenly distributed along the width direction of the first bamboo-wood based composite board, and a number of cross joints are evenly distributed along the length direction of the first bamboo-wood based composite board.

[0085] Expansion joints and cross joints are uniformly arranged in sequence along the x-axis direction and the y-axis direction respectively. The widths of the expansion joints and the cross joints 4 can be the same or different; the distribution densities of the expansion joints and the cross joints 4 can be the same or different. Preferably, the width of the expansion joint is less than the width of the cross joint. It should be understood that the width of the expansion joint is the width along the x-axis direction, and the width of the cross joint is the width along the y-axis direction; the distribution density of the expansion joints 3 is greater than the distribution density of the cross joints.

[0086] During processing, the first bamboo-wood based composite board and the second bamboo-wood based composite board are processed separately. The first bamboo-wood based composite board and the second bamboo-wood based composite board are processed by means of bonding and splicing of boards respectively. The expansion joints and the cross joints are opened before the bonding of the first bamboo-wood based composite board and the second bamboo-wood based composite board, and the opening is formed by cutting with a saw blade for glued laminated wood.

[0087] In this embodiment, multiple expansion joints are opened along the height direction as longitudinal expansion joints. The depth of multiple openings in the longitudinal expansion joints is greater than that of the first bamboo-wood based composite board, so that some longitudinal expansion joints penetrate through the second bamboo-wood based composite board to damage the plant growth fibers in the second bamboo-wood based composite board. Multiple expansion joints are opened along the height direction as longitudinal expansion joints. Multiple transverse expansion joints are also opened on the stable structure unit perpendicular to the longitudinal expansion joints. Here, the transverse expansion joints are a form of existence of the cross joints.

[0088] The stable structure core board of the present invention utilizes the opening of the expansion joints and the cross joints to form a stable hard surface on the surface where the opening of the expansion joint or the cross joint is located on the first bamboo-wood based composite board. The growth direction of the plant fibers on the first bamboo-wood based composite board is perpendicular to this stable hard surface. By opening multiple expansion joints and cross joints on the first bamboo-wood based composite board, a stable board form is formed. That is, a single expansion joint will divide the first bamboo-wood based composite board into multiple parallel vertical small boards, thereby connecting and separating the first bamboo-wood based composite board, making it less likely to deform laterally due to the shrinkage rate, reducing the amplitude of deformation. And if there are crisscross expansion joints and cross joints, especially when the cross joints exist as transverse expansion joints and the original expansion joints exist as longitudinal expansion joints, the first bamboo-wood based composite board will be divided into a cluster of independent and parallel small columns, cutting off the connections in the front, back, left, and right, further reducing the possibility of lateral connection deformation and improving the overall stability, but the vertical direction of the small columns where the plant fibers are located is hardly affected.

[0089] On the surface where the opening of the expansion joint or cross joint is located on the first bamboo-wood-based composite board, a stable structure hard surface is formed. A laminated panel is covered on the stable structure hard surface of the grid body of the first bamboo-wood-based composite boards on both sides to make a sandwich board, which is a double-layer hard core board. When used as a door core board, a panel is bonded to the stable structure hard surface of the first bamboo-wood-based composite board where the expansion joint and cross joint are opened. Specifically, according to the size of the required door panel, a number of glued wood joint core grid boards are spliced along the x-axis direction and / or y-axis direction. The splicing is through glue bonding. Then, a door panel is covered on the spliced glued wood joint core grid board. Door panels are respectively arranged on the two thickness sides of the glued wood joint core grid board. The door panels form the front and back sides of the door. A frame needs to be set outside. The frame can be a solid wood frame or just a decorative edge strip. The thickness of the door panel is 5-10 mm. The door panel needs to be processed into a flat and smooth surface. The material can be the same as or different from the material of the glued wood joint core grid board. The glued wood joint core grid board is made of, for example, pine. The door panel can be selected from wood-based panels such as rubber wood, beech, eucalyptus, mahogany, and rosewood.

[0090] Example 2

[0091] In this embodiment, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are boards containing plant growth fibers, including wooden boards, multi-layer wooden boards, bamboo boards, multi-layer bamboo boards, or bamboo-wood composite multi-layer boards. The bamboo-wood-based stable structure joint core board in this embodiment belongs to a composite board structure made of a first basic unit, as shown in Figure 16 , Figure 17 and Figure 18 shown, and its composition includes:

[0092] One layer of the first bamboo-wood-based composite board and one layer of the second bamboo-wood-based composite board, the first bamboo-wood-based composite board is parallel to the second bamboo-wood-based composite board and is adhesively connected to the second bamboo-wood-based composite board.

[0093] To more clearly understand the content of this embodiment, a three-dimensional coordinate system is established with the width direction of the first bamboo-wood-based composite board and the second bamboo-wood-based composite board as the x-axis, the length direction as the y-axis, and the thickness direction as the z-axis.

[0094] The plant fiber direction of the first bamboo-wood-based composite board is arranged along the z-axis direction, and the plant fiber direction of the second bamboo-wood-based composite board is arranged along the x-axis.

[0095] The first bamboo-wood-based composite board is provided with criss-cross expansion joints and cross joints on the opposite surface adhesively connected to the second bamboo-wood-based composite board. The expansion joints run through the two length sides of the first bamboo-wood-based composite board along the y-axis direction, and the cross joints run through the two width sides of the first bamboo-wood-based composite board along the x-axis direction. A number of expansion joints are evenly distributed along the width direction of the first bamboo-wood-based composite board, and a number of cross joints are evenly distributed along the length direction of the first bamboo-wood-based composite board.

[0096] Expansion joints and cross joints are uniformly arranged in sequence along the x-axis direction and the y-axis direction respectively. The widths of the expansion joints and the cross joints can be the same or different; the distribution densities of the expansion joints and the cross joints 4 can be the same or different.

[0097] Preferably, the width of the expansion joint is smaller than that of the cross joint. It should be understood that the width of the expansion joint is the width along the x-axis direction, and the width of the cross joint is the width along the y-axis direction; the distribution density of the expansion joint 3 is greater than that of the cross joint.

[0098] During processing, the first bamboo-wood based composite board and the second bamboo-wood based composite board are processed separately. The first bamboo-wood based composite board and the second bamboo-wood based composite board are processed by means of plate bonding and splicing respectively. The expansion joints and the cross joints are opened before the first bamboo-wood based composite board and the second bamboo-wood based composite board are bonded, and the opening is formed by cutting with a saw blade for glued laminated wood.

[0099] In the first basic unit, a panel is laminated and covered on the stable structure hard surface of the first bamboo-wood based composite board, and the second bamboo-wood based composite board is made into a single-layer hard core board as the bottom board. When used as a tabletop or a countertop, a panel can also be bonded to the side of the first bamboo-wood based composite board where the expansion joints and the cross joints are opened, as Figure 14 shown. Specifically, according to the size of the required tabletop, several glued laminated wood joint core grid boards are spliced along the x-axis direction and / or the y-axis direction. The splicing is carried out by glue bonding, and then a panel is covered on the spliced glued laminated wood joint core grid board. The thickness of the panel is 4-6 mm, and the surface of the panel needs to be processed into a flat and smooth surface. The material can be the same as or different from that of the glued laminated wood joint core grid board. The glued laminated wood joint core grid board is made of, for example, pine, and the panel can be selected from wood-based plates such as rubber wood, beech, eucalyptus, mahogany, and rosewood. Along the growth direction of the fiber, the fiber has strong supporting force. The first bamboo-wood based composite board provides strong supporting force through the fiber perpendicular to the panel direction, and the second bamboo-wood based composite board provides supporting force and cohesion for the first bamboo-wood based composite board along the plane direction, avoiding the independent geometric bodies of the first bamboo-wood based composite board from being loose without support.

[0100] In this embodiment, the preparation of the bamboo-wood based stable structure joint core board structure includes the following steps:

[0101] First step: Prepare a bamboo-wood based stable structure. First, stack and bond multiple solid wood boards of the same length, the same width, and the same plant fiber direction together in the thickness direction to form a glued large wood board with the same plant fiber direction. Then, saw the glued large wood board along the width direction to form multiple glued wood cylinders of equal thickness. Saw a part of the glued wood cylinders along the width direction and the height direction to form integrated straight-grain boards as the first bamboo-wood based composite boards. Saw the other part of the glued wood cylinders along the length direction and the height direction to form integrated cross-cut boards as the second bamboo-wood based composite boards. Stack and bond two integrated straight-grain boards and one integrated cross-cut board together and bond them at the contact surface to form a stable structure column composed of two first bamboo-wood based composite boards clamping a second solid wood board;

[0102] Second step: Saw along the height direction of the stable structure column to form multiple stable structure units in the shape of blocks of equal thickness. In this stable structure unit, the inner sides of the two integrated straight-grain boards are respectively bonded to both sides of the middle integrated cross-cut board. The plant fibers of the middle integrated cross-cut board are parallel to the bonding surface, and the plant fibers of the two integrated straight-grain boards on both sides are perpendicular to the bonding surface;

[0103] Third step: Use a multi-blade saw to cut multiple expansion joints along the height direction on the stable structure unit. The expansion joints are cut on the integrated straight-grain boards on both sides as the first bamboo-wood based composite boards, and the bottom of the expansion joints is close to the integrated cross-cut board as the second bamboo-wood based composite board;

[0104] Fourth step: Lay an integrated cross-cut board on the operating table, arrange multiple stable structure units with expansion joints side by side on the integrated cross-cut board and bond them together so that the width of the integrated cross-cut board is equal to the length of the stable structure unit. When arranging, the end faces of the openings of the expansion joints are bonded to one side surface of the integrated cross-cut board. Then, cover another same integrated cross-cut board on the neatly arranged stable structure units and bond them together. By analogy, form several combined seam core large boards with stable structure units and integrated cross-cut boards alternating with each other.

[0105] Further, cutting multiple expansion joints along the height direction are longitudinal expansion joints. The depth of multiple cuts in the longitudinal expansion joints is greater than that of the first bamboo-wood based composite board, so that part of the longitudinal expansion joints penetrate through the second bamboo-wood based composite board to damage the plant growth fibers in the second bamboo-wood based composite board. Cutting multiple expansion joints along the height direction are longitudinal expansion joints. Multiple transverse expansion joints are also cut on the stable structure unit perpendicular to the longitudinal expansion joints.

[0106] When used as a door core board, bond a panel on the side of the first bamboo-wood based composite board where the expansion joints and cross joints are cut, such as Figure 17As shown, specifically according to the size of the required door panel, a number of glued laminated wood core grid boards are spliced along the x-axis direction and / or the y-axis direction. The splicing is done by glue bonding. Then, a door panel is covered on the spliced glued laminated wood core grid board. Door panels are provided on both sides of the thickness of the glued laminated wood core grid board. The door panels form the front and back sides of the door. A border needs to be set on the outside. The border can be a solid wood border or just a decorative edge strip. The thickness of the door panel is 5-10 mm. The door panel needs to be processed to have a flat and smooth surface. The material can be the same as or different from that of the glued laminated wood core grid board. The glued laminated wood core grid board is made of, for example, pine. The door panel can be made of wood-based panels such as rubber wood, beech, eucalyptus, mahogany, and rosewood.

[0107] Embodiment 3

[0108] This embodiment is an application as a door panel structure. In the door panel structure, there is a bamboo and wood-based stable core board structure formed by combining a first bamboo and wood-based composite board and a second bamboo and wood-based composite board. The first bamboo and wood-based composite board and the second bamboo and wood-based composite board are alternately glued and laminated. The plant fiber direction of the first bamboo and wood-based composite board is perpendicular to the bonding surface, and the plant fiber direction of the second bamboo and wood-based composite board is parallel to the bonding surface. After the adjacent thick laminates are bonded, the plant fiber directions are perpendicular to each other; on the first bamboo and wood-based composite board, there are a plurality of parallel expansion joints and cross joints arranged crosswise with the expansion joints. Both the expansion joints and the cross joints are opened along the plant growth fiber direction. The front surface of the first bamboo and wood-based composite board with the expansion joints and the cross joint openings is the hard core surface; on the hard core surface, there is a panel, and a border is provided around the bamboo and wood-based stable core board.

[0109] As a special design of the door panel structure, the arrangement density of the expansion joints and the cross joints provided on the first bamboo and wood-based composite board has a gradually increasing gradient from the inside to the outside. In a specific design, the arrangement density of the expansion joints and the cross joints has a gradually increasing gradient from the inside to the outside, and the density increase amplitude between adjacent gradients is greater than 10%.

[0110] When the stable structure core board is used as a door panel, intersecting expansion joints and intersecting joints are designed, so that the first bamboo-based composite board therein is broken into geometric columns along the direction of plant growth fibers. The volume of the first bamboo-based composite board is greatly reduced through the joints, but the supporting force can be ensured by the upright plant growth fibers. In order to further reduce the deformation caused by stress, the opening density of the expansion joints and intersecting joints of the first bamboo-based composite board in the stable structure core board is also limited. Under the condition of the same surface material, the opening density in the middle should be less than that near the edge. After the upper and lower panels are glued and laminated with the core hard core surface with expansion joints and intersecting joints, the residual stress at the center of the door panel is released and transmitted to the periphery of the door, resulting in greater stress in the core layer around the periphery and increasing gradually from the middle to the edge. According to different performance frames and panels with different dry shrinkage rates, at least a range where the expansion joint density around the periphery is greater than the expansion joint density in the middle by 10% needs to be adjusted to make the dry shrinkage rate of the core board around the edge smaller. And it can increase the ability to absorb the stress transmitted from the middle to the periphery, making the overall dry shrinkage rate of the door panel after gluing and lamination tend to be consistent, so that the deformation stress near the edge of the door panel is smaller than that in the middle, ensuring that the overall door panel is more stable and not easily deformed.

[0111] This embodiment is only a further explanation of the invention and not a limitation of the invention. Those skilled in the art can make non-creative modifications to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the invention, it is protected by the patent law.

Claims

1. A bamboo-wood-based stabilizer structure, characterized in that: The stabilizer comprises a plurality of thick laminates bonded together, the thick laminates are divided into a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are alternately bonded and laminated, the plant fibers of the first bamboo-wood-based composite board run perpendicular to the bonding surface, the plant fibers of the second bamboo-wood-based composite board run parallel to the bonding surface, the plant fibers of adjacent thick laminates run perpendicular to each other after bonding, and the thickness Q of the second bamboo-wood-based composite board and the thickness B of the adjacent first bamboo-wood-based composite board satisfy the following relationship: 0<Q≤2*a2*B Wherein, the shrinkage rate range of the first bamboo-wood based composite board in the thickness direction is (a1, a2).

2. A bamboo-wood-based stabilizer according to claim 1, characterized in that: The invention comprises a first basic unit, wherein the first basic unit comprises a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, wherein the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are laminated by gluing.

3. A bamboo-wood-based stabilizer according to claim 1, characterized in that: It comprises a second basic unit, which comprises two first bamboo-wood-based composite boards and a second bamboo-wood-based composite board. The two first bamboo-wood-based composite boards sandwich a second bamboo-wood-based composite board and are laminated and glued to form a sandwich structure.

4. A bamboo-wood-based stabilizer according to any one of claims 1 to 3, characterized in that: The first bamboo-wood-based composite board and the second bamboo-wood-based composite board are both boards containing plant-grown fibers, including wooden boards, wooden multilayer boards, bamboo boards, bamboo multilayer boards, or bamboo-wood composite multilayer boards.

5. A bamboo-wood-based stable joint core board structure, characterized in that: It comprises a multi-layer thick laminate board which is bonded together, the thick laminate board is divided into a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are alternately bonded and laminated, the plant fibers of the first bamboo-wood-based composite board run perpendicular to the bonding surface, the plant fibers of the second bamboo-wood-based composite board run parallel to the bonding surface, and the plant fibers of adjacent thick laminate boards run perpendicular to each other after bonding; an expansion joint is opened on the first bamboo-wood-based composite board along the direction of plant growth fibers.

6. The bamboo-wood-based stable joint core board structure according to claim 5 is characterized in that: A plurality of parallel expansion joints are provided on the first bamboo-wood-based composite board, and the front side of the first bamboo-wood-based composite board with the expansion joint openings is a hard core surface.

7. The bamboo-wood-based stable joint core board structure according to claim 6 is characterized in that: The first bamboo-wood-based composite board is also provided with a cross seam, which is provided along the direction of plant growth fibers and cross-arranged with the expansion joint.

8. The bamboo-wood-based stable joint core board structure according to claim 7 is characterized in that: The density of the expansion joints and cross joints decreases from the center to the surrounding areas, forming a gradient hard core surface on the first bamboo-wood-based stable joint core board.

9. A bamboo-wood-based stable joint core board structure according to claim 6 or 7, characterized in that: The expansion joints are divided into three types according to the opening depth and position: the first expansion joint is entirely opened on the first bamboo-wood-based composite board, and the end of the first expansion joint is close to the bonding surface, which is called an A-type joint; the second expansion joint penetrates the first bamboo-wood-based composite board to the bonding surface, and there is no expansion joint on the second bamboo-wood-based composite board, which is called a B-type joint; the third expansion joint penetrates the first bamboo-wood-based composite board and extends to the second bamboo-wood-based composite board, and there is an expansion joint on the second bamboo-wood-based composite board, which is called a C-type joint.

10. The bamboo-wood-based stable joint core board structure according to claim 9, characterized in that: It comprises a first basic unit or a second basic unit, wherein the first basic unit is formed by laminating and gluing a first bamboo-wood-based composite board and a second bamboo-wood-based composite board, and the second basic unit is formed by laminating and gluing two first bamboo-wood-based composite boards and a second bamboo-wood-based composite board, and the first bamboo-wood-based composite boards on both sides of the second basic unit and the second bamboo-wood-based composite board in the middle form a sandwich structure.

11. The bamboo-wood-based stable joint core board structure according to claim 10, characterized in that: It is composed of at least one of the first basic units, and a plurality of A-type seams are opened on the hard core surface of the first basic unit. The hard core surface is used as the core surface of the three-ply board, and the second bamboo-wood-based composite board is used as the backboard, and is glued and laminated with the panel covering the hard core surface to form a three-ply board, which is called a single-layer column core board.

12. The bamboo-wood-based stable joint core board structure according to claim 10, characterized in that: It is composed of at least one of the second basic units, and a plurality of B-type seams and cross seams arranged in a cross state with the B-type seams are opened on the bonding surface of the first bamboo-wood-based composite board. The hard core surface of the first bamboo-wood-based composite board is divided by the B-type seams and the cross seams into geometric bodies that are not connected to each other and are uniformly bonded to the second bamboo-wood-based composite board, forming a double-layer geometric body arranged on both sides of the second bamboo-wood-based composite board, with the hard core surface where the double-layer geometric body is located as the core surface of the board, and two panels are used to cover the core surfaces of the board respectively and glued and laminated to form a large board, which is called a double-layer column core board.

13. The bamboo-wood-based stable joint core board structure according to claim 10, characterized in that: The bamboo-wood-based stable seam core board structure is composed of the first basic unit or the second basic unit. A plurality of C-shaped seams and cross seams are arranged on the first bamboo-wood-based composite board. The hard core surface of the first bamboo-wood-based composite board is divided into a plurality of independent geometric bodies by the C-shaped seams and the cross seams. Part of the plant growth fibers of the second bamboo-wood-based composite board are cut by the C-shaped seams and the cross seams to form a supporting curved surface. The supporting curved surface with an independent geometric body is glued and laminated with a surface panel arranged on a curved surface mold to form a curved panel, which is called a curved column core board.

14. A bamboo-wood-based stable joint core board structure according to any one of claims 5 to 13, characterized in that: The first bamboo-wood-based composite board and the second bamboo-wood-based composite board are boards containing plant-grown fibers, and are wooden boards, wooden multilayer boards, bamboo boards, bamboo multilayer boards, or bamboo-wood composite multilayer boards.

15. The bamboo-wood-based stable joint core board structure according to claim 14, characterized in that: A functional core layer is also provided in the second bamboo-wood-based composite board, and the functional core layer is one or more of a heat-insulating polyurethane board, a metal board, a fireproof board, a glass fiber braided layer, and a carbon fiber braided layer.

16. A door panel structure, characterized in that: It includes the bamboo-wood-based stable-structure seam core board structure as described in claim 14, the first bamboo-wood-based composite board and the second bamboo-wood-based composite board are alternately glued and laminated, the plant fiber orientation of the first bamboo-wood-based composite board is perpendicular to the bonding surface, the plant fiber orientation of the second bamboo-wood-based composite board is parallel to the bonding surface, and the plant fiber orientations of adjacent thick laminates are perpendicular to each other after bonding; a plurality of parallel expansion joints and cross joints intersecting the expansion joints are provided on the first bamboo-wood-based composite board, the expansion joints and cross joints are both opened along the plant growth fiber direction, the front side of the first bamboo-wood-based composite board with expansion joints and cross joints openings is a hard core surface; a panel is provided on the hard core surface, and a frame is provided around the bamboo-wood-based stable-structure seam core board.

17. A door panel structure according to claim 16, characterized in that: The arrangement density of the expansion joints and the cross joints arranged on the hard core surface of the first bamboo-wood-based composite board has a gradually increasing gradient from the inside to the outside.

18. A door panel structure according to claim 17, characterized in that: The step-by-step increase in the density of the expansion joints and the cross joints is greater than 10%.

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