Anti-deformation and anti-cracking outdoor board and preparation method thereof

Abstract

The invention relates to the technical field of outdoor board preparation, in particular to an anti-deformation and anti-cracking outdoor board and a preparation method, an outdoor bamboo board is prepared by adopting a new technical process, and a stress balance structure is adopted on the board structure, so that the obtained outdoor board is uniform in thickness and moisture content, and the performance of the outdoor board is improved. Therefore, the density of the outdoor board is uniform, the situation that internal stress is generated due to water change in the later use process of the outdoor board, and finally the outdoor board deforms and cracks is avoided, and the problem that when an existing outdoor bamboo board is prepared, due to the fact that raw materials are uneven in thickness and water content before being pressed, the outdoor bamboo board is prone to deformation and cracking is solved. And internal stress is generated due to the change of water in later use, so that the material is easy to deform and crack.

Description

Technical Field

[0001] The invention relates to the technical field of outdoor board preparation, and in particular to an outdoor board resistant to deformation and cracking and a preparation method thereof. Background Art

[0002] With the continuous development of science and technology, people are now paying more and more attention to the sustainable development of green resources. Bamboo has gradually attracted people's attention due to its rapid growth. In the use of outdoor panels, bamboo panels are gradually used to replace wooden panels to reduce the use of wood.

[0003] The outdoor bamboo boards and bamboo floors currently on the market have no horizontal strength because bamboo has only vertical cells and no horizontal cells. Therefore, the boards manufactured have no horizontal strength and are prone to cracking when used outdoors.

[0004] When preparing outdoor bamboo boards, the thickness and moisture content of the raw materials before pressing are uneven, resulting in uneven density of the materials. In the later use, internal stress is generated due to changes in moisture, which makes them easy to deform and crack.

[0005] The new technology and process solves the problem of uneven moisture content of the material, and the product structure adopts a stress balance structure, thus solving the problem of easy cracking and deformation of outdoor bamboo panels. Summary of the invention

[0006] The purpose of the present invention is to provide an outdoor board material that is resistant to deformation and cracking and a preparation method, so as to solve the technical problems that the existing outdoor bamboo board materials are prone to deformation and cracking due to uneven thickness and uneven moisture content of the raw materials before pressing during preparation, resulting in uneven density of the materials, and internal stress is generated due to changes in moisture during later use.

[0007] To achieve the above object, the present invention provides a method for preparing an outdoor board material that is resistant to deformation and cracking, comprising the following steps:

[0008] Weaving bamboo bundles with cotton thread into bamboo curtains;

[0009] The bamboo curtain and the other bamboo bundles and veneer are first placed in a glue coating roller, the glue coating roller is a sponge wheel, the bamboo filaments are coated with phenolic resin glue by the glue coating roller, and then the coated bamboo filaments are sequentially passed through a group of sparse tooth rollers and a pair of brush rollers to obtain the bamboo filaments evenly coated with glue;

[0010] The impregnated bamboo bundle and the bamboo curtain are placed in a closed environment at 30-40°C for equilibrium;

[0011] Put the dried materials into the special structure pad in order and pave them. After paving, put the special structure exhaust cover on it.

[0012] Put the paved blank into the hot press for hot pressing;

[0013] The hot pressed slab is taken out from the hot press to obtain the required outdoor board.

[0014] The bamboo bundle has a length of 1000-3000 mm, a width of 50-300 mm, and a thickness of 2-15 mm.

[0015] Wherein, the specific gravity of the phenolic glue solution is 1.060-1.1.

[0016] After the bamboo bundle and the bamboo curtain are dried, the moisture content of the materials is dried to below 9%.

[0017] The order of laying the materials is as follows:

[0018] In the first layer, bamboo bundles are laid crosswise and overlapped;

[0019] In the second layer, lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk;

[0020] The third layer is to lay the woven bamboo curtain horizontally, with an even number of layers;

[0021] The fourth layer is to lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk;

[0022] On the fifth layer, lay the bamboo bundles in a partially cross-overlapping manner.

[0023] The hot pressing temperature of the hot press is 160-220°C and the unit pressure is 2.0-8.0Mpa / cm 2 .

[0024] The present invention also provides an outdoor board material that is resistant to deformation and cracking. The outdoor board material includes a five-layer composite structure, wherein the first and fifth layers are both bamboo bundle layers, the second and fourth layers are both balancing layers, and the third layer is a woven layer. The bamboo bundle layer is formed by paving bamboo bundles in a partially crossed and overlapped manner, the balancing layer is formed by paving 0.5-2mm veneer vertically and vertically with bamboo silk, and the woven layer is formed by paving bamboo curtains woven from bamboo bundles using cotton threads horizontally.

[0025] The invention discloses an outdoor board material resisting deformation and cracking and a preparation method thereof. The invention adopts a new technical process to prepare an outdoor bamboo board material, and adopts a stress balance structure in the board material structure, so that the thickness of the obtained outdoor board material is uniform, and at the same time, the moisture content is also uniform, so that the density of the outdoor board material is uniform, thereby avoiding the situation that the outdoor board material is deformed and cracked eventually due to the change of moisture in the later use process, and solves the technical problem that the existing outdoor bamboo board material is prone to deformation and cracking due to the uneven thickness and moisture content of the raw materials before pressing during preparation, resulting in uneven density of the material, and the internal stress is generated due to the change of moisture in the later use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0027] Figure 1 It is a process step diagram of a method for preparing an outdoor board material resistant to deformation and cracking according to a first embodiment of the present invention.

[0028] Figure 2 The method for preparing the outdoor board material resistant to deformation and cracking according to the first embodiment of the present invention is

[0029] Figure 3 The method for preparing the outdoor board material resistant to deformation and cracking according to the first embodiment of the present invention is

[0030] Figure 4 It is a schematic diagram of the overall structure of the deformation and crack resistant outdoor board according to the second embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of weaving a bamboo curtain of an outdoor board material that resists deformation and cracking according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0033] First embodiment:

[0034] See also Figures 1 to 3 The present invention provides a method for preparing an outdoor board material that is resistant to deformation and cracking, comprising the following steps:

[0035] S101, weaving bamboo bundles into bamboo curtains using cotton threads;

[0036] S102, firstly put the bamboo curtain and the other bamboo bundles and veneer into a glue coating roller, wherein the glue coating roller is a sponge wheel, and the bamboo filaments are coated with phenolic resin glue by the glue coating roller, and then the coated bamboo filaments are sequentially passed through a group of sparse tooth rollers and a pair of brush rollers to obtain the bamboo filaments uniformly coated with glue;

[0037] Specifically, the traditional outdoor floor gluing process is to immerse the bamboo fibers in a pool of glue, while the new gluing process is to apply phenolic resin glue to the bamboo fibers through a glue roller. Because the glue can only be applied to the surface of the bamboo fibers during roller application, the glued bamboo fibers need to be passed through a set of loosening gears to open the bamboo fibers, and then passed through a pair of brush rollers to drive the excess glue on the surface into the bamboo fibers. Figure 2 As shown. By adopting a new gluing process, the waste of glue pool in the traditional process is solved, and the environmental problems caused by glue overflowing and evaporating from the pool are avoided.

[0038] S103, placing the impregnated bamboo bundle and the bamboo curtain in a closed environment at 30-40° C. for equilibrium;

[0039] Specifically, the traditional outdoor flooring process is completely immersed in glue. Since the glue contains water, the bamboo fibers absorb a large amount of water. The bamboo fibers impregnated with glue need to be dried at a temperature of 50-70°C. The new dipping process is a roller coating process, so the amount of glue applied is controllable and the water content is low. It does not require drying treatment, but only moisture balance treatment. Compared with the traditional process, it greatly reduces energy consumption.

[0040] S104, placing the dried materials in a special structure pad in order, paving them, and then placing a special structure exhaust cover plate on them;

[0041] Specifically, Figure 3 Place 2 layers of mesh steel plates on the pad, then lay the balanced materials on the mesh steel plates in order, and then place the 2 layers of mesh steel plates as cover plates on the slab.

[0042] In the traditional outdoor hot pressing process, the board is prone to blistering during high temperature hot pressing, so the press temperature during feeding is lower than 70 degrees, and it rises to more than 150 degrees during hot pressing. When leaving the press, the press temperature needs to be lowered to below 70 degrees. This hot pressing method wastes a lot of energy, and it takes time to cool down and heat up, so the production efficiency is not high. The new process adds a special honeycomb exhaust grid to solve the problem of steam exhaust difficulties under high temperature and high pressure, eliminates the heating and cooling process, greatly reduces energy consumption, and shortens the pressing time. Honeycomb grid board, the honeycomb hole size is 3-5mm, and the distance between the honeycombs is 3-5cm.

[0043] S105, placing the laid blank into a hot press for hot pressing;

[0044] S106, taking out the hot pressed slab from the hot press to obtain the required outdoor board.

[0045] In this embodiment, the present invention adopts a new technical process to prepare outdoor bamboo boards, and adopts a stress balance structure in the board structure, so that the thickness of the obtained outdoor boards is uniform, and at the same time, the moisture content is also uniform, so that the density of the outdoor boards is uniform, and then the outdoor boards will not generate internal stress due to changes in moisture during later use, which ultimately causes the outdoor boards to deform and crack. This solves the technical problem that during the preparation of existing outdoor bamboo boards, the thickness of the raw materials before pressing is uneven, the moisture content is uneven, resulting in uneven density of the materials, and internal stress is generated due to changes in moisture during later use, resulting in easy deformation and cracking.

[0046] The bamboo bundle has a length of 1000-3000 mm, a width of 50-300 mm, and a thickness of 2-15 mm.

[0047] Secondly, the weaving length of the bamboo curtain is 500-2000mm.

[0048] Again, the specific gravity of the phenolic glue solution is 1.060-1.1.

[0049] Meanwhile, after the bamboo bundle and the bamboo curtain are dried, the moisture content of the materials is dried to below 9%.

[0050] In addition, the paving order of the materials is:

[0051] In the first layer, bamboo bundles are laid crosswise and overlapped;

[0052] In the second layer, lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk;

[0053] The third layer is to lay the woven bamboo curtain horizontally, with an even number of layers;

[0054] The fourth layer is to lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk;

[0055] On the fifth layer, lay the bamboo bundles in a partially cross-overlapping manner.

[0056] In addition, the hot pressing temperature of the hot press is 160-220°C and the unit pressure is 2.0-8.0Mpa / cm 2 .

[0057] Finally, the hot pressing time of the hot pressing machine in step five is 5-10 minutes.

[0058] When using the method for preparing an outdoor board material resistant to deformation and cracking of this embodiment, the bamboo bundles are woven into a bamboo curtain using cotton thread. The weaving diagram of the bamboo curtain is as shown in FIG. Figure 3 As shown, the length of the bamboo bundle is 1000-3000mm, the width is 50-300mm, the thickness is 2-15mm, and the woven length of the bamboo curtain is 500-2000mm. After that, the bamboo curtain and the other bamboo bundles are immersed in a phenolic glue solution with a specific gravity of 1.060-1.1, and the wood roller is coated with phenolic resin glue. Then, the immersed bamboo bundles and bamboo curtains are placed in a drying environment at 50-80°C for drying. After drying, the moisture content of the bamboo bundles and bamboo curtains is dried to less than 9%, and then the dried materials are dried according to the following sequence The bamboos are laid in the following order: the first layer is to lay the bamboo bundles in a partially cross-overlap manner; the second layer is to lay the 0.5-2mm veneer in a longitudinal direction perpendicular to the bamboo silk; the third layer is to lay the woven bamboo curtain horizontally, and the number of layers is an even number; the fourth layer is to lay the 0.5-2mm veneer in a longitudinal direction perpendicular to the bamboo silk; the fifth layer is to lay the bamboo bundles in a partially cross-overlap manner. After laying, put the laid blanks into a hot press for hot pressing. The hot pressing temperature of the hot press is 160-220℃ and the unit pressure is 2.0-8.0Mpa / cm 2 The hot pressing time is 5-10 minutes, after which the hot pressed slab is taken out from the hot press to obtain the required outdoor board.

[0059] In summary, the present invention adopts a new technical process to prepare outdoor bamboo boards, and adopts a stress balance structure in the board structure, so that the thickness of the obtained outdoor boards is uniform, and at the same time, the moisture content is also uniform, so that the density of the outdoor boards is uniform, thereby avoiding the outdoor boards from generating internal stress due to changes in moisture during later use, and ultimately causing the outdoor boards to deform and crack. The technical problem that the existing outdoor bamboo boards are prepared because the thickness of the raw materials before pressing is uneven, the moisture content is uneven, resulting in uneven density of the materials, and internal stress is generated due to changes in moisture during later use, resulting in easy deformation and cracking.

[0060] Second embodiment:

[0061] Based on the first embodiment, please refer to Figure 4 and Figure 5The present invention also provides an outdoor board material that is resistant to deformation and cracking. The outdoor board material includes a five-layer composite structure, wherein the first and fifth layers are both bamboo bundle layers, the second and fourth layers are both balancing layers, and the third layer is a woven layer. The bamboo bundle layer is formed by paving bamboo bundles in a partially crossed and overlapped manner, the balancing layer is formed by paving 0.5-2mm veneer vertically and vertically with bamboo silk, and the woven layer is formed by paving bamboo curtains woven from bamboo bundles using cotton threads horizontally.

[0062] When using an outdoor board that resists deformation and cracking of the present embodiment, the outdoor board is made of a five-layer composite structure, which is: a bamboo bundle layer, a balancing layer, a woven layer, a balancing layer, and a bamboo bundle layer, and a new technical process is used to prepare the outdoor bamboo board, and a stress balance structure is adopted in the board structure, so that the thickness of the obtained outdoor board is uniform, and at the same time, the moisture content is also uniform, so that the density of the outdoor board is uniform, thereby avoiding the generation of internal stress due to changes in moisture in the outdoor board during the later use, which ultimately leads to deformation and cracking of the outdoor board.

[0063] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A method for preparing an outdoor board material that resists deformation and cracking, characterized in that: The following steps are involved: Weaving bamboo bundles with cotton thread into bamboo curtains; The bamboo curtain and the other bamboo bundles and veneer are first placed in a glue coating roller, the glue coating roller is a sponge wheel, the bamboo filaments are coated with phenolic resin glue by the glue coating roller, and then the coated bamboo filaments are sequentially passed through a group of sparse tooth rollers and a pair of brush rollers to obtain the bamboo filaments evenly coated with glue; The impregnated bamboo bundle and the bamboo curtain are placed in a closed environment at 30-40°C for equilibrium; Put the dried materials into the special structure pad in order and pave them. After paving, put the special structure exhaust cover on it. Put the paved blank into the hot press for hot pressing; The hot pressed slab is taken out from the hot press to obtain the required outdoor board.

2. The method for preparing the deformation and crack resistant outdoor board material according to claim 1, characterized in that: The bamboo bundle has a length of 1000-3000 mm, a width of 50-300 mm, and a thickness of 2-15 mm.

3. The method for preparing the deformation and crack resistant outdoor board material according to claim 1, characterized in that: The specific gravity of the phenolic glue solution is 1.060-1.

1.

4. The method for preparing an outdoor board material resistant to deformation and cracking according to claim 1, characterized in that: After the bamboo bundle and the bamboo curtain are dried, the moisture content of the materials is dried to below 9%.

5. The method for preparing an outdoor board material resistant to deformation and cracking according to claim 1, characterized in that: The order of laying the materials is: In the first layer, bamboo bundles are laid crosswise and overlapped; In the second layer, lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk; The third layer is to lay the woven bamboo curtain horizontally, with an even number of layers; The fourth layer is to lay the 0.5-2mm veneer vertically and perpendicularly to the bamboo silk; On the fifth layer, lay the bamboo bundles in a partially cross-overlapping manner.

6. The method for preparing an outdoor board material resistant to deformation and cracking according to claim 1, characterized in that: The hot pressing temperature of the hot press is 160-220°C and the unit pressure is 2.0-8.0Mpa / cm 2 .

7. A deformation and crack resistant outdoor board material, applied to the method for preparing the deformation and crack resistant outdoor board material according to any one of claims 1 to 6, characterized in that: The outdoor board includes a five-layer composite structure, the first and fifth layers are bamboo bundle layers, the second and fourth layers are balancing layers, and the third layer is a woven layer. The bamboo bundle layer is formed by bamboo bundles being paved in a partially crossed and overlapped manner, the balancing layer is formed by 0.5-2mm veneer being paved vertically along the longitudinal direction of bamboo silk, and the woven layer is formed by bamboo bundles being woven into bamboo curtains with cotton threads being paved horizontally.

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