Continuous flat pressing process of high-strength oriented strand board

Abstract

The present application relates to a kind of high-strength directional structure shaving board continuous flat pressing process, belong to the field of artificial wood material processing, steps include: S1, the large piece of shaving of core layer adhesive is applied as the raw material of board blank core layer, the large piece of shaving of adhesive is applied as the raw material of board surface layer, is laid, and board blank is obtained;S2, after board blank pre-pressing, in turn through microwave preheating and hot steam preheating process;S3, after preheating board blank enters continuous flat pressing device and is hot-pressed and shaped;Wherein, S1, core layer adhesive is: mixed with adhesive and wave-absorbing material is prepared;Wave-absorbing material includes one or more of ferrite, barium titanate, metal micro powder, graphite, silicon carbide, conductive fiber.Two preheating methods can be combined to complete preheating to board blank in short time, and the role of preheating is: adjust the temperature and humidity distribution of board blank in advance, to shorten heating step when hot-pressing step and can directly apply larger pressure, and hot-pressing time is greatly shortened.

Description

Technical Field

[0001] This invention belongs to the field of artificial wood material processing, specifically relating to a continuous flat pressing process for high-strength oriented strand board. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Oriented strand board (OSB), also known as oriented strand board, was initially widely used in the timber construction industry as a substitute for plywood. In recent years, it has found wide applications in furniture manufacturing and the construction industry. OSB is a structural board made from flat, narrow, long wood chips that have been dried / screened, then bonded with adhesives and additives, oriented, and hot-pressed. Hot pressing is the most crucial step in the OSB production process, its purpose being to cure the adhesives within the board. Typically, the top and bottom surfaces of the board are heated, causing the surface adhesives to cure. The cured surfaces then conduct pressure and temperature to the center of the board. Under the combined action of pressure and temperature, internal moisture and heat are continuously transferred and diffused until the central area is fully cured. Adhesives and wood shavings are poor conductors of heat and electricity, making it difficult for heat to be transferred from the surface of the slab to the center. Therefore, the core layer of the slab needs to be kept in a hot-pressed state for a long time during the curing process, and a large amount of heat is lost to the outside during the curing process. Hot pressing is considered a costly operation. Shortening the hot pressing time will have a positive impact on reducing production costs and improving factory production capacity.

[0004] Current methods for reducing hot-pressing time include high-frequency heating, steam injection, increasing adhesive curing rate, and optimizing pressing parameters. These techniques aim to improve heat transfer rate and allow the core layer temperature to reach the adhesive curing temperature as quickly as possible. However, for high-strength oriented strand board (OSB) made from large pieces of wood shavings, its excellent thermal insulation capacity limits the gaps that allow for steam injection, thus restricting the improvement in heat transfer rate and making it difficult to reduce hot-pressing time. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a continuous flat pressing process for high-strength oriented strand board (OSB). This process utilizes a combination of microwave and steam preheating to produce OSB, which significantly shortens the hot pressing time and results in uniform internal density and high strength of the board.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] Firstly, a continuous flat-pressing process for high-strength oriented strand board includes the following steps:

[0008] S1. Large wood shavings with applied core layer adhesive are used as the raw material for the core layer of the board blank, and large wood shavings with applied adhesive are used as the raw material for the surface layer of the board blank. The boards are then laid out to obtain the board blank.

[0009] S2. After the slab is pre-pressed, it is successively subjected to microwave preheating and hot steam preheating processes;

[0010] S3. The preheated slab is then placed into a continuous flat pressing device for hot pressing and shaping.

[0011] S1, the core layer adhesive, is prepared by mixing the adhesive with the microwave absorbing material.

[0012] The microwave absorbing material includes one or more of ferrite, barium titanate, metal micro powder, graphite, silicon carbide, and conductive fiber. The microwave absorbing material is a particulate material with a particle size of 0.5-20μm or a fiber material with a length of 0.05-2.5mm.

[0013] Secondly, the high-strength oriented strand board (OSB) produced by the aforementioned continuous flat pressing process is an example of an OSB manufactured using this method.

[0014] Thirdly, the continuous flat pressing process of the aforementioned high-strength oriented strand board and / or the application of the resulting high-strength oriented strand board include: the construction field and the container flooring field.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The microwave preheating method of this invention mainly preheats the core layer of the slab, while the hot steam preheating method mainly preheats the surface layer of the slab. By adding microwave-absorbing material to the adhesive of the slab core layer, the core layer can be preheated before the surface layer during the microwave preheating stage. The combination of the two preheating methods can complete the preheating of the slab in a short time. The purpose of preheating is to adjust the temperature and humidity distribution of the slab in advance, so as to shorten the heating step during the hot pressing step and directly apply greater pressure. Furthermore, the hot pressing time is significantly shortened.

[0017] 2. This invention uses microwave preheating and hot steam preheating to ensure uniform temperature throughout the slab, or a slightly higher temperature for the core slab than the surface slab. During hot pressing, the core and surface slabs deform synchronously and to similar degrees, resulting in a core and surface layer of oriented strand board with similar densities. This eliminates the core layer as a weak point under stress. Furthermore, it leads to a more uniform overall density and higher strength in the oriented strand board. Detailed Implementation

[0018] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] A continuous flat-pressing process for high-strength oriented strand board includes the following steps:

[0021] S1. Large wood shavings with applied core layer adhesive are used as the raw material for the core layer of the slab, and large wood shavings with applied adhesive are used as the raw material for the surface layer of the slab. The slab is then laid out to obtain the slab.

[0022] S2. After the slab is pre-pressed, it undergoes microwave preheating and hot steam preheating processes.

[0023] S3. The preheated slab is then placed into a continuous flat pressing device for hot pressing and shaping.

[0024] S1, the core layer adhesive, is prepared by mixing the adhesive with the microwave absorbing material.

[0025] The microwave absorbing material includes one or more of ferrite, barium titanate, metal micro powder, graphite, silicon carbide, and conductive fiber; the microwave absorbing material is a particulate material with a particle size of 0.5-20μm; or a fiber material with a diameter of 5-10μm and a length of 0.05-2.5mm.

[0026] By adding microwave-absorbing material to the adhesive of the slab core layer, the core layer can be preheated before the surface layer during the microwave preheating stage. The combination of these two preheating methods allows for rapid preheating of the slab. By adjusting the temperature and humidity distribution of the slab before the hot pressing step, the heating process can be shortened during hot pressing, allowing for the direct application of greater pressure and significantly reducing the hot pressing time.

[0027] Optionally, the adhesive includes one or more of biomass adhesives, MDI adhesives (isocyanate adhesives), urea-formaldehyde resin adhesives, and phenolic resin adhesives;

[0028] Optionally, in S1, the method for preparing large wood shavings includes: rotary cutting the wet logs and drying them to a set moisture content; specifically, the specifications of the large wood shavings are: 100-200mm in length, 30-60mm in width, 0.3-0.6mm in thickness, and 3-5% in moisture content.

[0029] Optionally, the adhesive application method is to place the dried wood shavings in a drum adhesive applicator and apply the adhesive by spraying.

[0030] Optionally, the microwave absorbing material accounts for 2-6% of the mass of the core layer adhesive; the application ratio of the core layer adhesive to the large wood shavings is 3-10%.

[0031] Optionally, in S1, multiple sets of multi-shaped paving heads are used for uniform paving during the paving process to obtain slab blanks.

[0032] Optionally, there are 4-6 sets of multiple paving heads in various forms, including roller paving heads and cage paving heads; specifically, the ratio of roller paving heads to cage paving heads is 1-1.5:1-2.

[0033] Optionally, in S1, the following materials are laid from bottom to top: the raw material of the slab surface layer, the raw material of the slab core layer, and the raw material of the slab surface layer to obtain a slab, so that the absorbing material is distributed in the slab core layer. The thickness ratio of the lower slab surface layer, the slab core layer, and the upper slab surface layer can be 3:(4-24):3.

[0034] The slab surface does not contain microwave absorbing material, which lays the foundation for the next preheating process.

[0035] In step S1, the large wood shavings used are ultra-thin large wood shavings. Compared with ordinary wood shavings, these shavings have a larger area and smaller gaps or seams when they overlap after being laid, resulting in stronger mechanical properties. They also have better thermal insulation capabilities and are less likely to heat the core of the slab through preheating with hot steam.

[0036] Optionally, in S2, the pre-compression pressure is 1.5-3.5 MPa. The purpose of pre-compression is to initially bind the raw materials into a whole, which facilitates subsequent conveying and processing steps.

[0037] Optionally, in S2, the output power of the microwave preheating equipment is 1-1000W, the length of the microwave heating device is 3m-10m, and the hot steam preheating adopts the artificial board surface spray steaming equipment. The speed of microwave preheating and hot steam preheating is synchronized with the speed of the press.

[0038] In step S2, since the adhesive and wood shavings have poor microwave absorption capabilities, the microwave energy will be mainly absorbed by the microwave absorbing material in the adhesive. After absorbing the microwave, the microwave absorbing material generates heat and acts as a heat source to heat the slab inside, raising the temperature of the adhesive and wood shavings to over 100°C. After microwave preheating, hot steam preheating is then used to heat the slab from the outside.

[0039] Optionally, in S2, the microwave preheating temperature is 100°C to 120°C, and the hot steam preheating temperature is 80°C to 120°C.

[0040] Optionally, the microwave preheating temperature is higher than the hot steam preheating temperature, or the microwave preheating temperature is equal to the hot steam preheating temperature, or the microwave preheating temperature is lower than the hot steam preheating temperature.

[0041] Optionally, in S3, the hot pressing process parameters are: hot pressing temperature 100℃-245℃, press speed 300~900mm / s, and pressure 1.0-5.5N / mm. 2 .

[0042] In step S3, because the shavings in the slab are in a softer state after preheating, they can withstand a larger temperature and pressure gradient, and reach the set temperature, pressure and thickness values ​​in a short time. After holding the pressure, the curing speed is fast, avoiding the problem of heat loss to the outside caused by long-term hot pressing. Therefore, the pre-pressing temperature should be as close as possible to the hot pressing temperature to reduce the hot pressing time.

[0043] On the other hand, the uniform degree of compression deformation in different parts of the slab avoids the problem of excessively high surface density and excessively low core density caused by low core temperature and difficult deformation in the preparation of ordinary oriented strand board. It eliminates the weak mechanical links in the core and can obtain higher mechanical properties with lower average density, which is conducive to the full utilization of raw materials.

[0044] Optionally, the continuous flat pressing process for high-strength oriented strand board also includes the following steps:

[0045] S4. After the board is produced, it is cut, cooled and post-processed to obtain a lightweight particleboard product of the specified size.

[0046] The high-strength oriented strand board is produced by the continuous flat pressing process of the above-mentioned high-strength oriented strand board.

[0047] Optionally, the thickness of the resulting high-strength oriented strand board ranges from 9 to 40 mm, and the density is 0.50 to 0.85 g / cm³. 3 Its static bending strength can reach 25-30 MPa.

[0048] The applications of the aforementioned high-strength oriented strand board include: the construction industry and the container flooring industry.

[0049] The high-strength oriented strand board prepared meets the performance requirements of the load-bearing oriented strand board (OSB / 2 type) in the GB / T 41715-2022 standard for oriented strand boards, and can be applied to load-bearing structures.

[0050] The high-strength oriented strand board prepared meets the performance of the LY / T 3226-2020 standard for oriented strand board for container flooring and can be used to prepare container flooring.

[0051] Example 1

[0052] This example uses imported radiata pine as raw material, MDI adhesive, and a designed board density of 0.59 g / cm³. 3 A core layer adhesive was prepared by mixing MDI adhesive with barium titanate powder, a microwave absorbing material, in a 18mm thick oriented structural plate.

[0053] The barium titanate powder is a particulate material with a particle size of 0.5-20μm, and the microwave absorbing material accounts for 2% of the mass of the adhesive.

[0054] First, radiata pine with a diameter of 20-40cm is peeled off using a bark peeler, and then extra-large shavings are prepared by rotary cutting machine. The shavings are 140-150mm long, 20-40mm wide, and 0.3-0.5mm thick.

[0055] The rotary-cut wood shavings are transported by conveyor belt to a drum-type drying cylinder for high-temperature (200°C) flue gas drying. The moisture content of the dried wood shavings is about 3-5%.

[0056] After drying, the wood shavings are fed into a drum-type adhesive mixer for application. The large wood shavings are applied with 3% adhesive and 1% of a waterproofing agent, paraffin emulsion, is added. The core layer wood shavings are applied with MDI adhesive containing barium titanate powder, while the surface layer wood shavings are applied with MDI adhesive without barium titanate powder.

[0057] After gluing, the wood shavings are laid in three layers in a longitudinal and transverse orientation using three diamond roller laying heads. The laying thickness ratio of the lower slab surface layer, the slab core layer, and the upper slab surface layer is 3:4:3.

[0058] The laid slabs enter the pre-loading stage, with a pre-loading pressure of 1.7 N / mm. 2 ;

[0059] After pre-compression, the core layer enters a microwave preheating device, where it is preheated to 100°C.

[0060] After the core layer is preheated, it enters a hot steam preheating device, and after being preheated by hot steam, the surface temperature rises to 100°C.

[0061] After preheating with hot steam, the process enters the hot pressing stage, with pressures of 2.6 N / mm² in the high-pressure, medium-pressure, and low-pressure zones. 2 1.6 N / mm 2 and 1.0 N / mm 2 The platen temperatures in the press temperature control zone are 245℃, 240℃, 225℃, 185℃, and 165℃, respectively.

[0062] After the boards are removed from the packaging, they undergo cutting, cooling, board inspection, and sanding before being packaged to obtain the final product.

[0063] The final density of the high-strength oriented strand board prepared in Example 1 is 0.58 g / cm³. 3 The static bending strength is 29.29 MPa, the elastic modulus is 3982 MPa, the internal bond strength is 1.11 MPa, and the 24-hour water absorption thickness expansion rate is 11.5%, which meets the technical standards for oriented strand board (OSB / 2 type).

[0064] Example 2

[0065] The raw material for this example is freshly harvested fast-growing poplar timber, and the designed density of the boards is 0.55 g / cm³. 3 A 30mm thick oriented strand board is prepared by mixing urea-formaldehyde resin adhesive with microwave absorbing material ferrite powder to prepare the core layer adhesive.

[0066] The ferrite powder is a particulate material with a particle size of 0.5-20μm, and the microwave absorbing material accounts for 4% of the mass of the adhesive.

[0067] First, fast-growing poplar trees with a diameter of 20-30cm are peeled using a bark-stripping machine, and then extra-large shavings are prepared by rotary cutting machine. The shavings are approximately 150mm long, 20-30mm wide, and 0.3-0.4mm thick.

[0068] The rotary-cut poplar shavings are transported by conveyor belt to a drum-type drying cylinder for high-temperature 240°C flue gas drying. The moisture content of the dried shavings is about 4%.

[0069] After drying, the wood shavings are fed into a drum-type adhesive mixer for application. The large wood shavings are applied with 9% adhesive and 1% of a waterproofing agent, paraffin emulsion, is added. The core layer wood shavings are applied with a urea-formaldehyde resin adhesive containing ferrite powder, while the surface layer wood shavings are applied with a urea-formaldehyde resin adhesive without ferrite powder.

[0070] After gluing, the wood shavings are laid in three layers in a longitudinal and transverse orientation using seven diamond roller laying heads. The laying thickness ratio of the lower slab surface layer, the slab core layer, and the upper slab surface layer is 2:6:2.

[0071] The laid slabs enter the pre-loading stage, with a pre-loading pressure of 1.5 N / mm.2 ;

[0072] After pre-compression, the core layer enters a microwave preheating device, where it is preheated to 120°C.

[0073] After the core layer is preheated, it enters a hot steam preheating device, and after being preheated by hot steam, the surface temperature rises to 120°C.

[0074] After preheating with hot steam, the process enters the hot pressing stage, with pressures of 3.5 N / mm² in the high-pressure, medium-pressure, and low-pressure zones. 2 2.5N / mm 2 and 1.5N / mm 2 The platen temperatures in the press temperature control zone are 185℃, 160℃, 130℃, and 115℃, respectively.

[0075] After the boards are removed from the packaging, they undergo cutting, cooling, board inspection, and sanding before being packaged to obtain the final product.

[0076] The final density of the high-strength oriented strand board prepared in this embodiment is 0.55 g / cm³. 3 The static bending strength is 27.15 MPa, the elastic modulus is 4201 MPa, the internal bond strength is 0.67 MPa, and the 24-hour water absorption thickness expansion rate is 15.5%, which meets the technical standards for oriented strand board (OSB / 2 type).

[0077] Example 3

[0078] The raw material for this example is freshly harvested fast-growing poplar timber, and the designed density of the boards is 0.85 g / cm³. 3 A 40mm thick oriented structural board is prepared by mixing phenolic resin adhesive with carbon fiber, a wave-absorbing material, to prepare the core layer adhesive.

[0079] The fibers are fibrous materials with a diameter of 5-10 μm and a length of 0.05-2.5 mm, and the microwave absorbing material accounts for 6% of the mass of the adhesive.

[0080] First, fast-growing poplar trees with a diameter of 20-30cm are peeled using a bark peeling machine, and then extra-large shavings are prepared by rotary cutting machine. The shavings are about 150mm long, 20-30mm wide, and 0.3-0.4mm thick.

[0081] The rotary-cut poplar shavings are transported by conveyor belt to a drum-type drying cylinder for high-temperature 240°C flue gas drying. The moisture content of the dried shavings is about 4%.

[0082] After drying, the wood shavings are fed into a drum-type adhesive mixer for application. The large wood shavings are applied with 8% adhesive and 1% of a waterproofing agent, paraffin emulsion, is added. The core layer wood shavings are applied with a phenolic resin adhesive containing carbon fiber, while the surface layer wood shavings are applied with a phenolic resin adhesive without carbon fiber.

[0083] After gluing, the wood shavings are laid in three layers in a longitudinal and transverse orientation using seven diamond roller laying heads. The laying thickness ratio of the lower slab surface layer, the slab core layer, and the upper slab surface layer is 3:4:3.

[0084] The laid slabs enter the pre-loading stage, with a pre-loading pressure of 3.5 N / mm. 2 ;

[0085] After pre-compression, the core layer enters a microwave preheating device, where it is preheated to 120°C.

[0086] After the core layer is preheated, it enters a hot steam preheating device, and after being preheated by hot steam, the surface temperature rises to 100°C.

[0087] After preheating with hot steam, the process enters the hot pressing stage, with pressures of 5.5 N / mm² in the high-pressure, medium-pressure, and low-pressure zones. 2 3.5N / mm 2 and 2.0 N / mm 2 The platen temperatures in the press temperature control zone are 165℃, 150℃, 110℃, and 100℃, respectively.

[0088] After the boards are removed from the packaging, they undergo cutting, cooling, board inspection, and sanding before being packaged to obtain the final product.

[0089] The final density of the high-strength oriented strand board prepared in this embodiment is 0.84 g / cm³. 3 The static bending strength is 30.31 MPa, the elastic modulus is 3698 MPa, the internal bond strength is 0.50 MPa, and the thickness expansion rate after 24 hours of water absorption is 11.5%, which meets the technical standards for oriented strand board (OSB / 2 type).

[0090] Comparative Example 1

[0091] Compared with Example 1, the difference is that no microwave absorbing material graphite powder is added, and no microwave preheating process is used.

[0092] The performance test results of each embodiment and comparative example (the test content is the load-bearing oriented strand board (OSB / 2 type) in dry state as specified in GB / T41715-2022) are summarized in Table 1.

[0093] Table 1

[0094]

[0095] As can be seen, due to the microwave preheating process used in Examples 1-3, the product quality all meets the technical standards of Oriented Strand Board (OSB / 2 type). Because microwave-absorbing materials are added to the adhesive, the core material can rapidly heat up during the microwave preheating process, and the internal temperature gradually transfers to the surface. Simultaneously, it significantly reduces the hot steam preheating time, further reducing the time and energy consumption of the hot pressing process. Since the technical solution of this invention can conveniently and quickly increase the preheating temperature of the hot-pressed blank, and microwave preheating and hot steam preheating are independent of each other, it provides greater flexibility in selecting temperature parameters.

[0096] The absence of microwave preheating in Comparative Example 1 significantly extends the preheating time of hot steam and the time spent in the hot pressing stage. Furthermore, due to the uneven internal density, there are weak points in the core mechanical structure. Although the overall final density is comparable to that of Example 1, the mechanical properties, including static bending strength, elastic modulus, and internal bond strength, are inferior to those of Example 1. This demonstrates the significant advantages of the technical solution of the present invention in saving energy and improving the mechanical properties of the board.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A continuous flat pressing process for high-strength oriented strand board (OSB), characterized in that, Includes the following steps: S1. Large wood shavings with applied core layer adhesive are used as the raw material for the core layer of the board blank, and large wood shavings with applied adhesive are used as the raw material for the surface layer of the board blank. The boards are then laid out to obtain the board blank. The specifications for large wood shavings are: length 140-200mm, width 30-60mm, thickness 0.3-0.5mm, and moisture content 3-5%. S2. After the slab is pre-pressed, it is successively subjected to microwave preheating and hot steam preheating processes; Microwave preheating temperature is 100℃ to 120℃, and hot steam preheating temperature is 80℃ to 120℃; S3. The preheated slab is then placed into a continuous flat pressing device for hot pressing and shaping. S4. After the board is produced, it is cut, cooled and post-processed to obtain a lightweight particleboard product of a set size. S1, the core layer adhesive, is prepared by mixing the adhesive with the microwave absorbing material. The microwave absorbing material includes one or more of ferrite, barium titanate, metal micro powder, graphite, silicon carbide, and conductive fiber; the microwave absorbing material is particulate material with a particle size of 0.5-20μm and / or fiber material with a length of 0.05-2.5mm; In the core layer adhesive, the microwave absorbing material accounts for 2-6% of the adhesive mass; the application ratio of the core layer adhesive to large wood shavings is 3-10%. In S2, the slab is pre-pressed and then enters the microwave preheating device. After microwave preheating, the core layer temperature is raised to 100℃. After core layer preheating, it enters the hot steam preheating device. The output power of the microwave preheating device is 1-1000W, and the length of the microwave heating device is 3m-10m. Hot steam preheating adopts the artificial board surface spraying equipment. The speed of microwave preheating and hot steam preheating is synchronized with the speed of the press. Microwave preheating and hot steam preheating enable the core layer of the slab to be preheated before the surface layer of the slab during the microwave preheating stage; and make the temperature in the slab uniform, or the temperature of the core layer slab slightly higher than that of the surface layer slab.

2. The continuous flat pressing process for high-strength oriented strand board as described in claim 1, characterized in that, Adhesives include one or more of biomass adhesives and resin adhesives.

3. The continuous flat pressing process for high-strength oriented strand board as described in claim 2, characterized in that, Adhesives include: One or more of MDI adhesive, urea-formaldehyde resin adhesive, and phenolic resin adhesive.

4. The continuous flat pressing process for high-strength oriented strand board as described in claim 1, characterized in that, In S1, the method for preparing large wood shavings includes: rotary cutting of wet logs and drying to a set moisture content.

5. The continuous flat pressing process for high-strength oriented strand board as described in claim 4, characterized in that, The adhesive application method is as follows: place the dried wood shavings in a drum-type adhesive applicator and apply the adhesive by spraying.

6. The continuous flat pressing process for high-strength oriented strand board as described in claim 1, characterized in that, In S1, multiple sets of multi-shaped paving heads are used for uniform paving during the paving process to obtain slab blanks.

7. The continuous flat pressing process for high-strength oriented strand board as described in claim 6, characterized in that, The raw materials are laid out sequentially from bottom to top: the raw materials for the surface layer of the slab, the raw materials for the core layer of the slab, and the raw materials for the surface layer of the slab, to obtain the slab.

8. The continuous flat pressing process for high-strength oriented strand board as described in claim 6, characterized in that, The absorbing material is distributed in the core layer of the slab, and the thickness ratio of the lower slab surface layer, the slab core layer and the upper slab surface layer is 3:4-24:

3.

9. The continuous flat pressing process for high-strength oriented strand board as described in claim 1, characterized in that, In S2, the pre-compression pressure is 1.5-3.5 MPa.

10. The continuous flat pressing process for high-strength oriented strand board as described in claim 1, characterized in that, In S3, the hot-pressing temperature is 100℃-245℃, and the pressure is 1.0-5.5 N / mm. 2 .

11. A high-strength oriented strand board (OSB) produced by a continuous flat pressing process according to any one of claims 1-10.

12. A continuous flat-pressing process for high-strength oriented strand board as described in any one of claims 1-10 and / or the application of high-strength oriented strand board as described in claim 11, characterized in that, Applied to load-bearing structures.

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