Oriented structural plate for container bottom plate and preparation method of oriented structural plate

Abstract

The invention discloses an oriented structural plate for a container bottom plate and a preparation method of the oriented structural plate. According to the method, fast-growing tree species wood is selected as a preparation raw material, and the preparation raw material is processed in a rotary cutting and slicing shaving mode; the wood shavings-shaped raw materials are dried; carrying out low-temperature plasma treatment on the dried shavings-shaped raw materials obtained by adopting the rotary cutting mode; selecting five layers of equal-proportion shaving-shaped raw materials, and carrying out sizing and directional paving to obtain shaving board blanks; the shaving board blank is subjected to three-section type long-time hot pressing treatment, and an oriented structural board with the thickness ranging from 15 mm to 18 mm is obtained; standing and storing the oriented structural plate subjected to hot pressing in a specified environment for specified time; according to the oriented structural plate for the container bottom plate and the preparation method of the oriented structural plate, the rotary-cut and sliced wood shaving layers are obtained in a wood shaving mode, the wood shaving layers are subjected to special drying, sizing and assembly structural design, and it is guaranteed that the plate has excellent bending resistance and is stable in size.

Description

Technical Field

[0001] This invention belongs to the field of wood processing technology, and in particular to an oriented strand board for container flooring and its preparation method. Background Technology

[0002] Currently, plywood is the primary material used for wooden container floors in the market. While plywood-based container floors offer excellent mechanical properties and good processing results, they suffer from high raw material requirements, low wood utilization (around 50%), high production costs, and the inability to achieve automated continuous production. Oriented strand board (OSB), using fast-growing small-diameter timber as its main raw material, possesses physical and mechanical properties comparable to plywood, boasts a high wood utilization rate (over 80%), and can be produced on a large scale and continuously. Developing OSB for wooden container floors is of significant practical importance for efficiently utilizing my country's abundant fast-growing timber resources, reducing dependence on imported timber, and protecting national timber security.

[0003] Chinese Patent No. CN101712167A, "A Composite Floor for Containers," discloses a composite floor for containers, which is composed of several layers of veneer glued together. The structural design of this composite floor is similar to that of traditional multi-layer plywood. Chinese Patent No. CN101722537A, also titled "A Composite Floor for Containers," discloses a container floor composed of multiple layers of veneer and particleboard. This technology allows for the production of container floor floors that reduce costs while meeting the usage requirements of container floor floors. Chinese Patent No. CN116495370A, "A Container Floor and Its Manufacturing Method," discloses a method for manufacturing a container floor including a bamboo layer, a hardwood layer, an impact-resistant layer, and a core. Chinese Patent No. CN201313332Y, "A Container Floor," discloses a container floor made from artificial wood or sliced ​​thin bamboo through multi-layer gluing. The application scope of container flooring is expanded by adding beams, side panels and insulation layers in Chinese patent number CN201520502U, "Container flooring and container".

[0004] However, currently, the main applications of oriented strand board (OSB) are wall panels and roof panels for wood structures, panel furniture, or packaging boards. The mechanical properties of traditional OSB cannot meet the requirements for container flooring. Container flooring requires rigorous trolley testing, and traditional OSB often fails due to its low shear strength.

[0005] To address the aforementioned problems, this invention provides an oriented strand board (OSB) for container flooring and its preparation method, solving the problem that traditional OSB has poor mechanical properties and cannot meet the requirements for container flooring. Summary of the Invention

[0006] Objective of the invention: To provide an oriented strand board (OSB) for container flooring and its preparation method, wherein the OSB produced by the method has excellent bending resistance, high internal bond strength, and good dimensional stability.

[0007] To achieve the above objectives, the present invention is implemented using the following technical solution: On the one hand, the present invention provides a method for manufacturing an oriented strand board for a container floor, the method specifically including the following steps: S1: Select fast-growing tree species as raw materials, and process the raw materials by shaving to obtain shaving-like raw materials of a preset size; wherein, the shaving method includes rotary cutting and planing. S2: Dry the shaving-like raw material; S3: The dried shavings-like raw material obtained by the rotary cutting method is subjected to low-temperature plasma treatment; S4: Select five layers of the shaving-like raw material in equal proportions, apply adhesive and lay in a directional manner to obtain a particleboard blank; Among them, three of the five equally proportioned shaving-like raw materials are shaving-like raw materials obtained by rotary cutting, and the remaining two are shaving-like raw materials obtained by slicing. S5: Perform a three-stage hot pressing process on the particleboard blank to obtain an oriented strand board with a thickness of 15mm-18mm.

[0008] In some possible embodiments, the fast-growing tree species timber in S1 includes 5-8 year old Italian poplar trees with a diameter of 10-20 cm.

[0009] In a further embodiment, the preset size of the shaving-like material obtained by the rotary cutting method in S1 is 150±5mm×25±2mm×0.5mm, and the preset size of the shaving-like material obtained by the slicing method is 100±3mm×20±1mm×1.0mm.

[0010] In a further embodiment, in S2, the drying of the shaving-like raw material further includes drying the shaving-like raw material obtained by the rotary cutting method using a mesh belt, and drying the shaving-like raw material obtained by the slicing method using a drum. The drying temperature of the mesh belt dryer is 100-130℃, and the warpage of the dried shavings-like raw material is less than 3%.

[0011] In a further embodiment, in step S3, the processing power of the low-temperature plasma treatment is 4.5 kW, the processing gas flow rate is 0.6 L / min, and the processing time is 5 s.

[0012] In a further embodiment, in S4, the five layers of shaving-like raw materials selected in equal proportions are respectively a first surface shaving, a second surface shaving, a first surface shaving, a second surface shaving, and a core shaving. Wherein, the first surface shavings, the second surface shavings, and the core shavings are all shaving-like raw materials obtained by the rotary cutting method, and the first surface shavings and the second surface shavings are both shaving-like raw materials obtained by the slicing method.

[0013] In a further embodiment, the first and second surface shavings are dried to an average moisture content of 2.6-2.8%, the first and second surface shavings are dried to an average moisture content of 3.7-4.1%, and the core shavings are dried to an average moisture content of 4.5-5.3%.

[0014] In a further embodiment, in S4, the directional paving specifically includes paving in the order of the first surface layer shavings, the first layer of surface shavings, the core layer shavings, the second layer of surface shavings, and the second layer of surface shavings. Specifically, the target angle between the first and second surface wood chips is set to 0°. During the paving process, 75-78% of the angle between the first and second surface wood chips is in the range of -10° to 10°. The target angle between the first and second surface shavings is set to ±90°. During the paving process, 79-82% of the angle between the first and second surface shavings is in the range of -80° to -90° or 80° to 90°. The angle of the core layer shavings is random.

[0015] In a further embodiment, in step S5, the three-stage hot pressing process specifically includes the following steps: S5-1: Low-pressure preloading, preloading time is 1 min, preloading pressure is 3 MPa, and preloading temperature is 180℃; S5-2: High-temperature hot pressing, hot pressing time is 5 min, hot pressing pressure is 5-6 MPa, hot pressing temperature is 180℃; S5-3: Low-pressure holding, holding time is 4-5 minutes, holding pressure is 3 MPa, holding temperature is 180℃; after hot pressing, the density of the surface layer, sub-surface layer and core layer of the board are basically the same or the surface layer density is slightly higher than the core layer, and the difference between the surface and core layer densities is no more than 5%.

[0016] On the other hand, an oriented structural plate for container flooring is prepared by the method for preparing oriented structural plate for container flooring provided by the present invention. The beneficial effects of this invention are as follows: This method obtains rotary-cut and sliced ​​particle layers through a shaving process. The particle layers undergo special drying, gluing, and assembly structure design to ensure the board possesses excellent physical and mechanical properties. This solves the problem of severe homogenization prevalent in most current oriented strand board (OSB) industries. OSB prepared by this method can replace plywood specifically for container flooring, exhibiting excellent bending resistance and dimensional stability. Attached Figure Description

[0017] Figure 1 This is a VDP diagram of an oriented structural plate for a container floor provided in Embodiment 1 of the present invention.

[0018] Figure 2 This is an elastic modulus diagram of an oriented structural plate for container flooring provided in Embodiment 1 of the present invention.

[0019] Figure 3 This is a static bending strength diagram of an oriented structural plate for container flooring provided in Embodiment 1 of the present invention.

[0020] Figure 4 This is a VDP diagram of an oriented structural plate for a container floor provided in Embodiment 2 of the present invention.

[0021] Figure 5 This is an elastic modulus diagram of an oriented structural plate for container flooring provided in Embodiment 2 of the present invention.

[0022] Figure 6 This is a static bending strength diagram of an oriented structural plate for container flooring provided in Embodiment 2 of the present invention. Detailed Implementation

[0023] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Example 1: This example discloses a method for preparing a oriented strand board (OSB) for a container floor. The preparation method includes: S1: Fast-growing Italian poplar trees aged 5-8 years, with a diameter of approximately 10-20 cm, are selected as the raw material. Under air-drying conditions, the moisture content of the poplar shavings is 12±0.2%, and the density is 0.45±0.05 g / cm³. 3Fast-growing Italian poplar is processed using rotary cutting and planing methods. The preset dimensions of the shavings obtained by rotary cutting are 150±5mm×25±2mm×0.5mm, and the preset dimensions of the shavings obtained by planing are 100±3mm×20±1mm×1.0mm. The thickness fluctuation range of the shavings obtained by planing and rotary cutting is small, generally less than 0.1mm. S2: In order to control the moisture content of the shavings, the shavings are dried; the drying of the shavings further includes drying the shavings obtained by the rotary cutting method with a mesh belt and drying the shavings obtained by the slicing method with a drum. Specifically, the drying temperature of the mesh belt dryer is 105℃, the warpage of the dried shavings is less than 2.1%, and the drying time varies from 15min to 30min depending on the thickness of the shavings and the initial moisture content. The aforementioned drum drying method uses a single-channel drum dryer to dry the wood shavings obtained by slicing. It should be noted that the single-channel drum dryer is a drying equipment commonly used by oriented strand board (OSB) manufacturers.

[0026] Generally, rotary shavings are large and thin, and high-temperature rapid drying can easily cause significant curling or warping deformation. Subsequent glue application then struggles to reach the curled surface, resulting in localized glue shortages and affecting bond strength. To avoid this drying defect, this invention employs a mesh belt low-temperature drying method for rotary shavings. Therefore, the specific parameters of the mesh belt dryer include an air velocity of 0.5-1 m / s, a mesh belt running speed of 2-4 m / min, and a dryer length of 65 m.

[0027] S3: The dried shavings-like raw material obtained by the rotary cutting method is subjected to low-temperature plasma treatment; the processing power of the low-temperature plasma treatment is 4.5kW, the processing gas flow rate is 0.6L / min, and the processing time is 5s.

[0028] Furthermore, the equipment used in this method for low-temperature plasma treatment is installed at the outlet of the mesh belt dryer. The dried rotary-cut wood shavings fall from the mesh belt into the low-temperature plasma treatment equipment. The specific mechanical structure of the low-temperature plasma treatment equipment is not limited here; any existing low-temperature plasma treatment equipment capable of achieving the above functions is applicable. Specifically, "low-temperature" refers to a treatment temperature range of 10℃-40℃. Preferably, the low-temperature plasma treatment equipment in this method can be a wood veneer low-temperature dielectric barrier plasma (DBD) continuous treatment device, model ZD-1000B.

[0029] S4: Select five layers of shaving-like raw materials in a ratio of 1:1:1:1:1, wherein the five layers of shaving-like raw materials are a first surface layer of shavings, a second surface layer of shavings, a first outer surface layer of shavings, a second outer surface layer of shavings, and a core layer of shavings. Further, the first surface layer of shavings, the second surface layer of shavings, and the core layer of shavings are all shaving-like raw materials obtained by the rotary cutting method and subjected to low-temperature plasma treatment; the first surface layer of shavings and the second surface layer of shavings are shaving-like raw materials obtained by the slicing method; the first surface layer of shavings and the second surface layer of shavings are dried to an average moisture content of 2.8% after drying, the first surface layer of shavings and the second surface layer of shavings are dried to an average moisture content of 4.1% after drying, and the core layer of shavings is dried to an average moisture content of 5.3% after drying.

[0030] The five layers of shaving-like raw materials were applied using a drum-type adhesive mixer at a dosage of 8%. The adhesive used was phenolic resin. The specific mechanical structure of the drum-type adhesive mixer is not limited here; any existing adhesive application equipment capable of performing the above functions is applicable.

[0031] During the sizing process, try to keep the shavings intact. After the sizing is completed, the five layers of shavings are laid out using a laying device. The laying sequence is as follows: with the core layer of shavings as the center, the first surface layer of shavings and the first surface layer of shavings are connected sequentially on one side, and the second surface layer of shavings and the second surface layer of shavings are connected sequentially on the other side.

[0032] A paving device was used to directionally pave the surface and core layers of wood shavings. The target angle of the first and second surface layer wood shavings was set to 0°. During the paving process, 78% of the angles of the first and second surface layer wood shavings were in the range of -10° to 10°. The target angle of the first and second surface layer wood shavings was set to ±90°. During the paving process, 82% of the angles of the first and second surface layer wood shavings were in the range of -80° to -90° or 80° to 90°. The angle of the core layer wood shavings was random.

[0033] Specifically, the paving device is located downstream of the adhesive application equipment. The specific mechanical structure of the paving device is not limited here; any existing paving equipment capable of achieving the above functions is applicable. Preferably, this method can be implemented using a currently industrialized particle directional paving device with five paving heads. The first and second surface particle layers use longitudinal paving heads, the first and second surface particle layers use transverse paving heads, and the core particle layer uses a paving head without directional effect.

[0034] S5: After the particleboard blanks are laid, they are fed into a hot press for hot pressing. The hot pressing process consists of three stages: low-pressure pre-pressing, high-temperature hot pressing, and low-pressure holding. The pre-pressing time is 1 minute, the pre-pressing pressure is 3 MPa, and the pre-pressing temperature is 180°C. The hot pressing time is 5 minutes, the hot pressing pressure is 5 MPa, and the hot pressing temperature is 180°C. The low-pressure holding time is 5 minutes, the holding pressure is 3 MPa, and the holding temperature is 180°C, resulting in an oriented strand board with a thickness of 15 mm. The specific mechanical structure of the hot press is not limited here, and any existing hot pressing equipment that can achieve the above functions is applicable.

[0035] After hot pressing, the surface layer density, sub-surface layer density, and core layer density of the oriented strand board are basically the same, or the surface layer density is slightly higher than the core layer density, and the difference between the surface layer density and the core layer density is no more than 5%.

[0036] S6: Allow the 15mm oriented strand board that has been hot-pressed to stand for 72 hours at room temperature.

[0037] Reference Figures 1-3 In this embodiment, the density gradient of the cross-section is controlled by segmenting temperature, pressure, and time parameters. The average surface density of the oriented strand board prepared by the above method is 780 kg / m³. 3 The average density of the core layer is 745 kg / m³. 3 The five-layer structure board maintains a basically consistent density in its surface and core layers, and features high elastic modulus, excellent shear resistance, good moisture resistance, dimensional stability, and high screw-holding force.

[0038] Example 2: A method for preparing a oriented strand board (OSB) for a container floor disclosed in this example, the method comprising: S1: Fast-growing Italian poplar trees aged 5-8 years, with a diameter of approximately 10-20 cm, are selected as the raw material. Under air-drying conditions, the moisture content of the poplar shavings is 12±0.2%, and the density is 0.45±0.05 g / cm³. 3 Fast-growing Italian poplar is processed using rotary cutting and planing methods. The preset dimensions of the shavings obtained by rotary cutting are 150±5mm×25±2mm×0.5mm, and the preset dimensions of the shavings obtained by planing are 100±3mm×20±1mm×1.0mm. The thickness fluctuation range of the shavings obtained by planing and rotary cutting is small, generally less than 0.1mm. S2: Drying the shaving-like raw material; the drying of the shaving-like raw material further includes drying the shaving-like raw material obtained by the rotary cutting method using a mesh belt; drying the shaving-like raw material obtained by the slicing method using a drum. Specifically, the drying temperature of the mesh belt dryer is 130℃, the warpage of the dried shavings is less than 2.5%, and the drying time is generally 15min-30min depending on the thickness of the shavings and the initial moisture content.

[0039] The aforementioned drum drying method uses a single-channel drum dryer to dry the wood shavings obtained by slicing. It should be noted that the single-channel drum dryer is a drying equipment commonly used by oriented strand board (OSB) manufacturers.

[0040] Generally, rotary shavings are large and thin, and high-temperature rapid drying can easily cause significant curling or warping deformation. Subsequent glue application then struggles to reach the curled surface, resulting in localized glue shortages and affecting bond strength. To avoid this drying defect, this invention employs a mesh belt low-temperature drying method for rotary shavings. Therefore, the specific parameters of the mesh belt dryer include an air velocity of 0.5-1 m / s, a mesh belt running speed of 2-4 m / min, and a dryer length of 65 m.

[0041] S3: The dried shavings-like raw material obtained by the rotary cutting method is subjected to low-temperature plasma treatment; the processing power of the low-temperature plasma treatment is 4.5kW, the processing gas flow rate is 0.6L / min, and the processing time is 5s.

[0042] Furthermore, the equipment used in this method for low-temperature plasma treatment is installed at the outlet of the mesh belt dryer. The dried rotary-cut wood shavings fall from the mesh belt into the low-temperature plasma treatment equipment. The specific mechanical structure of the low-temperature plasma treatment equipment is not limited here; any existing low-temperature plasma treatment equipment capable of achieving the above functions is applicable. Specifically, "low-temperature" refers to a treatment temperature range of 10℃-40℃. Preferably, the low-temperature plasma treatment equipment in this method can be a wood veneer low-temperature dielectric barrier plasma (DBD) continuous treatment device, model ZD-1000B.

[0043] S4: Select five layers of shaving-like raw materials in a ratio of 1:1:1:1:1, wherein the five layers of shaving-like raw materials are a first surface layer of shavings, a second surface layer of shavings, a first outer surface layer of shavings, a second outer surface layer of shavings, and a core layer of shavings. Further, the first surface layer of shavings, the second surface layer of shavings, and the core layer of shavings are all shaving-like raw materials obtained by the rotary cutting method and subjected to low-temperature plasma treatment; the first outer surface layer of shavings and the second outer surface layer of shavings are shaving-like raw materials obtained by the slicing method; the first surface layer of shavings and the second surface layer of shavings are dried to an average moisture content of 2.6% after drying, the first outer surface layer of shavings and the second outer surface layer of shavings are dried to an average moisture content of 3.7% after drying, and the core layer of shavings is dried to an average moisture content of 4.5% after drying.

[0044] The five layers of shaving-like raw materials were applied using a drum-type adhesive mixer at a dosage of 8%. The adhesive used was phenolic resin. The specific mechanical structure of the drum-type adhesive mixer is not limited here; any existing adhesive application equipment capable of performing the above functions is applicable.

[0045] During the sizing process, try to keep the shavings intact. After the sizing is completed, lay out the five layers of shavings. The laying order is as follows: with the core layer of shavings as the center, connect the first surface layer of shavings and the first surface layer of shavings in sequence on one side, and connect the second surface layer of shavings and the second surface layer of shavings in sequence on the other side.

[0046] A paving device is used to directionally pave the surface and core layers of wood shavings. The target angle of the first and second surface layer wood shavings is set to 0°. During the paving process, 75% of the angles of the first and second surface layer wood shavings are in the range of -10° to 10°. The target angle of the first and second surface layer wood shavings is set to ±90°. During the paving process, 79% of the angles of the first and second surface layer wood shavings are in the range of -80° to -90° or 80° to 90°. The angle of the core layer wood shavings is random.

[0047] Specifically, the paving device is located downstream of the adhesive application equipment. The specific mechanical structure of the paving device is not limited here; any existing paving equipment capable of achieving the above functions is applicable. Preferably, this method can be implemented using a currently industrialized particle directional paving device with five paving heads. The first and second surface particle layers use longitudinal paving heads, the first and second surface particle layers use transverse paving heads, and the core particle layer uses a paving head without directional effect.

[0048] S5: After the particleboard blanks are laid, they are fed into a hot press for hot pressing. The hot pressing process consists of three stages: low-pressure pre-pressing, high-temperature hot pressing, and low-pressure holding. The pre-pressing time is 1 minute, the pre-pressing pressure is 3 MPa, and the pre-pressing temperature is 180°C. The hot pressing time is 5 minutes, the hot pressing pressure is 6 MPa, and the hot pressing temperature is 180°C. The low-pressure holding time is 4 minutes, the holding pressure is 3 MPa, and the holding temperature is 180°C, resulting in an oriented strand board with a thickness of 18 mm. The specific mechanical structure of the hot press is not limited here, and any existing hot pressing equipment that can achieve the above functions is applicable.

[0049] After hot pressing, the surface layer density, sub-surface layer density, and core layer density of the oriented strand board are basically the same, or the surface layer density is slightly higher than the core layer density, and the difference between the surface layer density and the core layer density is no more than 5%.

[0050] S6: Allow the 18mm oriented strand board that has been hot-pressed to stand for 72 hours at room temperature.

[0051] Reference Figures 4-6 In this embodiment, the density gradient of the cross-section is controlled by segmenting the temperature, pressure, and time parameters; the average surface density of the oriented strand board prepared by the above method is 765 kg / m³. 3 The average density of the core layer is 743 kg / m³. 3 The five-layer structure board maintains a basically consistent density in its surface and core layers, and features high elastic modulus, excellent shear resistance, good moisture resistance, dimensional stability, and high screw-holding force.

[0052] Example 3: This example provides an oriented strand board for container flooring, which is prepared by the method described in either Example 1 or Example 2. The oriented strand board produced by the method has excellent bending resistance, high internal bond strength, and good dimensional stability.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0054] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A method for manufacturing oriented strand board (OSB) for container floor, characterized in that: The method specifically includes the following steps: S1: Select fast-growing tree species as raw materials, and process the raw materials by shaving to obtain shaving-like raw materials of a preset size; wherein, the shaving method includes rotary cutting and planing. S2: Dry the shaving-like raw material; S3: The dried shavings-like raw material obtained by the rotary cutting method is subjected to low-temperature plasma treatment; S4: Select five layers of the shaving-like raw material in equal proportions, apply adhesive and lay in a directional manner to obtain a particleboard blank; Among them, three of the five equally proportioned shaving-like raw materials are shaving-like raw materials obtained by rotary cutting, and the remaining two are shaving-like raw materials obtained by slicing. S5: Perform a three-stage hot pressing process on the particleboard blank to obtain an oriented strand board with a thickness of 15mm-18mm.

2. The method for preparing a oriented strand board for a container floor according to claim 1, characterized in that: The fast-growing tree species in S1 include Italian poplar trees that are 5-8 years old and have a diameter of 10-20 cm.

3. The method for preparing a oriented strand board for a container floor according to claim 1, characterized in that: The preset dimensions of the shaving-like raw material obtained by the rotary cutting method in S1 are 150±5mm×25±2mm×0.5mm, and the preset dimensions of the shaving-like raw material obtained by the slicing method are 100±3mm×20±1mm×1.0mm.

4. The method for preparing a oriented strand board for a container floor according to claim 3, characterized in that: In S2, the drying of the shaving-like raw material further includes drying the shaving-like raw material obtained by the rotary cutting method using a mesh belt, and drying the shaving-like raw material obtained by the shaving method using a drum. The drying temperature of the mesh belt dryer is 100-130℃, and the warpage of the dried shavings-like raw material is less than 3%.

5. The method for preparing a oriented strand board for a container floor according to claim 1, characterized in that: In S3, the processing power of the low-temperature plasma treatment is 4.5kW, the processing gas flow rate is 0.6L / min, and the processing time is 5s.

6. The method for preparing a oriented strand board for a container floor according to claim 3, characterized in that: In S4, the five layers of shaving-like raw materials selected in equal proportions are respectively the first surface shavings, the second surface shavings, the first surface shavings, the second surface shavings, and the core shavings. Wherein, the first surface shavings, the second surface shavings, and the core shavings are all shaving-like raw materials obtained by the rotary cutting method, and the first surface shavings and the second surface shavings are both shaving-like raw materials obtained by the slicing method.

7. A method for preparing a oriented strand board for a container floor according to claim 6, characterized in that: The first and second surface shavings are dried to an average moisture content of 2.6-2.8%, the first and second surface shavings are dried to an average moisture content of 3.7-4.1%, and the core shavings are dried to an average moisture content of 4.5-5.3%.

8. The method for preparing a oriented strand board for a container floor according to claim 7, characterized in that: In S4, the directional paving specifically includes laying the first surface layer shavings, the first layer of surface shavings, the core layer shavings, the second layer of surface shavings, and the second layer of surface shavings in sequence. Specifically, the target angle between the first and second surface wood chips is set to 0°. During the paving process, 75-78% of the angle between the first and second surface wood chips is in the range of -10° to 10°. The target angle between the first and second surface shavings is set to ±90°. During the paving process, 79-82% of the angle between the first and second surface shavings is in the range of -80° to -90° or 80° to 90°. The angle of the core layer shavings is random.

9. The method for preparing a oriented strand board for a container floor according to claim 1, characterized in that: In step S5, the three-stage hot pressing process specifically includes the following steps: S5-1: Low-pressure preloading, preloading time is 1 min, preloading pressure is 3 MPa, and preloading temperature is 180℃; S5-2: High-temperature hot pressing, hot pressing time is 5 min, hot pressing pressure is 5-6 MPa, hot pressing temperature is 180℃; S5-3: Low pressure holding, holding time is 4-5 minutes, holding pressure is 3 MPa, and holding temperature is 180℃.

10. A oriented strand board for container flooring, characterized in that: It is prepared by the method described in any one of claims 1-9.

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