Production device and method of thin shaving board

Abstract

The invention provides a production method of a thin shaving board. The production method comprises the following steps: S1, chipping; s2, primary screening; s3, ring planing treatment; s4, drying; s5, performing secondary screening; s6, polishing is conducted; s7, sizing is conducted; s8, paving is conducted; s9, prepressing is conducted; s10, hot pressing; s11, plate cooling and post-treatment are carried out; s12, curing is conducted, and standing is conducted for 48 hours in a flat storage yard; and S13, sanding and grading. According to the production device and method of the thin shaving board, the surface layer paving uniformity of the thin shaving board can be effectively improved, the thickness deviation is reduced, the phenomena of breakage and cracking in the pre-pressing process are remarkably reduced through optimization of pre-pressing process parameters and cooperative control of the paving process, and the product percent of pass is improved.

Description

Technical Field

[0001] This invention belongs to the field of thin particleboard production and processing technology, and specifically relates to a production apparatus and method for thin particleboard. Background Technology

[0002] Particleboard, also known as chipboard, is a type of engineered wood product made from wood or other plant fibers through the application of adhesives and other additives under hot and pressing conditions. Due to its advantages such as low cost, moderate strength, and good processing performance, it is widely used in furniture manufacturing, interior decoration, and packaging materials.

[0003] With the development of the modern construction and home furnishing industry, the market demand for particleboard is becoming increasingly diversified, especially for thin particleboard (usually 2-6mm thick). Due to its lightweight, easy-to-cut and bend characteristics, thin particleboard is widely used in applications such as door panels, drawer fronts, decorative veneer substrates, and the middle layer of composite flooring.

[0004] Currently, the surface layer installation process for ultra-thin (3-5.7mm) particleboard (PB board) has the following prominent problems: 1. Uneven thickness of surface layer: Since the surface layer of the ultra-thin sheet is only 2mm thick, the existing paving technology is difficult to distribute the fine material evenly, resulting in a large deviation in surface layer thickness after paving (usually greater than or equal to 0.3mm), which affects the stability of subsequent pre-pressing and hot pressing.

[0005] 2. Pre-compression fracture and cracking: After the surface fine material is laid, when entering the pre-compression stage, uneven laying density or unreasonable distribution of pre-compression pressure can easily cause defects such as internal fracture and surface cracking of the board, resulting in a low product qualification rate (usually less than or equal to 80%).

[0006] 3. Defects in process connection: The parameters of surface paving and pre-compression (such as paving thickness, pre-compression pressure, and temperature) lack precise matching, which further aggravates the uneven internal stress and structural defects of the board.

[0007] Therefore, there is an urgent need for an improved solution for the laying and pre-pressing process of ultra-thin particleboard to solve the technical problems of poor surface uniformity and high pre-pressing breakage rate. Summary of the Invention

[0008] In view of this, the present invention addresses the shortcomings of the prior art by providing a production apparatus and method for thin particleboard, which can not only effectively improve the uniformity of the surface layer of thin particleboard and reduce thickness deviation, but also significantly reduce the breakage and cracking phenomenon during the pre-pressing process and improve the product qualification rate by optimizing the pre-pressing process parameters and coordinating the control of the laying process.

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for producing thin particleboard, comprising the following steps: S1, chipping, is the process of chipping wood raw materials with a moisture content of ≥40% into wood chips with a length of 20-40mm; S2, initial screening, removes bark, mud, and dust from the wood chips through a sieve; S3, ring planing, which processes wood chips into shavings with dimensions of 5-40mm in length, 1-20mm in width, and 0.6mm in thickness; S4, Drying: Drying is carried out in a flue gas dryer with an inlet temperature of 200℃ and an outlet temperature of 120-130℃. The dryer speed is 18.5 rpm, and the drying time is adjusted to 2-6 minutes depending on the size of the wood shavings. The moisture content after drying is controlled at 1.5-2%. S5, secondary screening, separates the dried wood shavings into surface fines and core coarses; S6, Grinding, grinding some of the fine materials into powdery fine materials; S7, applying adhesive: applying adhesive to the surface fine material and the core coarse material separately using a high-speed, high-pressure multi-nozzle adhesive mixer, resulting in uniform adhesive distribution; S8, Paving: A 2mm thick surface layer of fine material is laid on the upper and lower surfaces, and the core layer of coarse material is placed in the middle to form a slab. S9, Pre-compression, pre-compressing the paved slabs to eliminate internal voids; S10, hot pressing, hot pressing is carried out in a five-section hot pressing frame. The hot pressing zone in the five-section hot pressing frame includes a high pressure zone, a pressure holding zone, a pressure holding zone one, a pressure holding and thickness fixing zone and a pressure holding zone two. S11, Cooling and post-processing: Cooling the hot-pressed boards to room temperature, trimming the edges, and then stacking and marking them. S12, conditioning, left to stand in a leveled storage yard for 48 hours; S13, Sanding and Grading: The boards are sanded to a fixed thickness, and then sorted into superior, qualified and waste boards by infrared detection.

[0010] As a further improvement of the present invention, the flue gas dryer in step S4 is 28-30 meters long and 5.8-6.0 meters in diameter, with a Z-shaped carbon heat-conducting plate structure on the inner wall, and is driven by three sets of drive rollers.

[0011] As a further improvement of the present invention, the amount of adhesive used in step S7 is 8-12% of the wood shavings mass, and multiple nozzles are used for simultaneous spraying, with a minimum of 3 nozzles.

[0012] As a further improvement of the present invention, the surface fine material paving in step S8 adopts dynamic airflow distribution technology to ensure that the uniformity deviation of the paving thickness is ≤0.1mm.

[0013] As a further improvement of the present invention, the hot pressing pressure in step S10 is 1.2-1.5 MPa, and the pressure in the pressure holding and thickness fixing zone is reduced by 30%-40% compared to the high pressure zone.

[0014] As a further improvement of the present invention, in step S10, the temperature of the high-pressure zone is 230°C, the temperature of the pressure-holding zone is 210°C, the temperature of the first pressure-holding zone is 190°C, the temperature of the pressure-holding and thickness-fixing zone is 180°C, and the temperature of the second pressure-holding zone is 170°C.

[0015] As a further improvement of the present invention, the thickness deviation of the plate being sanded in step S13 is ≤0.05mm.

[0016] A production apparatus for thin particleboard includes: Drying system: including a flue gas dryer with a Z-shaped carbon heat-conducting plate inner wall, which is 28-30 meters long and 5.8-6.0 meters in diameter, and equipped with three sets of drive rollers; Glue application system: includes a high-speed glue mixer and a multi-nozzle glue spraying device; Paving system: including paving platforms with dynamic airflow distribution for uniform paving of surface fines; Hot pressing system: includes a five-section hot pressing frame, each section has an independently controllable temperature, and the temperature gradient is 230℃→210℃→190℃→180℃→170℃. Inspection and grading system: including infrared defect detector and automatic sorting robotic arm.

[0017] As a further improvement of the present invention, the Z-shaped heat-conducting plate of the dryer is fixed to the inner wall by welding, and the carbon steel thickness is 12mm; the airflow distribution device of the paving system includes an air pump with adjustable wind speed and a perforated jet plate to eliminate the problem of uneven thickness of the surface paving; the perforated jet plate has a hole diameter of 0.5-1.0mm and the airflow distribution uniformity deviation is ≤5%.

[0018] As a further improvement of the present invention, the pressure holding and thickness setting zone of the hot pressing system is equipped with a pressure sensor and an adaptive three-stage regulating valve to control the pressure release rate in order to accurately control the thickness tolerance; the detection and grading system adopts machine vision and infrared fusion technology, which can detect and sort internal defects of the sheet material in real time.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: Firstly, by adopting a paving system with dynamic airflow distribution technology, combined with an adjustable air pump and a perforated jet plate, the paving thickness of the surface fine material is effectively controlled, keeping the deviation within ±0.1mm. This solves the problem of uneven thickness in traditional processes and lays a good foundation for subsequent pre-pressing and hot pressing.

[0020] Secondly, by optimizing the coordinated control of paving and pre-compression processes, combined with uniform material distribution and reasonable pressure transmission, the internal stress concentration of the slab is significantly reduced, delamination and surface cracking are avoided, the stability of pre-compression forming is improved, and the product qualification rate is increased to over 95%.

[0021] Thirdly, the inner wall of the flue gas dryer is equipped with a Z-shaped carbon heat-conducting plate structure to enhance heat transfer efficiency. Combined with precise temperature control (inlet 200℃, outlet 120–130℃) and speed control (18.5 rpm), it can achieve rapid and uniform drying of wood shavings, with the moisture content stably controlled at 1.5–2%, while reducing energy consumption.

[0022] Fourth, the five-section hot pressing frame achieves temperature gradient reduction (230℃→170℃) and pressure graded adjustment. In particular, the pressure in the pressure holding and thickness setting zone is reduced by 30%–40% compared to the high-pressure zone. It is also equipped with a pressure sensor and a three-stage regulating valve to achieve precise thickness control and slow pressure release, preventing rebound and deformation.

[0023] Fifth, the high-speed, multi-nozzle glue mixer ensures uniform glue spraying and precise control of glue application (8–12%); the detection and grading system integrates machine vision and infrared technology to achieve automatic defect identification and grading of the board after sanding, with sanding thickness deviation ≤0.05mm, which greatly improves product quality consistency and production automation level.

[0024] Sixth, the entire set of equipment has a compact structure and strong linkage between systems. It is fully automated from chipping, drying, gluing, laying to hot pressing and testing. It is suitable for continuous and industrialized production of 3-6mm thin particleboard and has good promotion and application value. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a flowchart of the production method of the thin particleboard of the present invention; Figure 2 This is a structural block diagram of the thin particleboard production apparatus of the present invention. Detailed Implementation

[0027] To better understand the present invention, the following embodiments further illustrate the content of the invention, but the scope of protection of the present invention is not limited to the following embodiments. Numerous specific details are set forth in the following description to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details.

[0028] like Figure 1 As shown, a method for producing thin particleboard includes the following steps: S1, chipping, is the process of chipping wood raw materials with a moisture content of ≥40% into wood chips with a length of 20-40mm; S2, initial screening, removes bark, mud, and dust from the wood chips through a sieve; S3, ring planing, which processes wood chips into shavings with dimensions of 5-40mm in length, 1-20mm in width, and 0.6mm in thickness; S4, Drying: Drying is carried out in a flue gas dryer with an inlet temperature of 200℃ and an outlet temperature of 120-130℃. The dryer speed is 18.5 rpm, and the drying time is adjusted to 2-6 minutes depending on the size of the wood shavings. The moisture content after drying is controlled at 1.5-2%. S5, secondary screening, separates the dried wood shavings into surface fines and core coarses; S6, Grinding, grinding some of the fine materials into powdery fine materials; S7, applying adhesive: applying adhesive to the surface fine material and the core coarse material separately using a high-speed, high-pressure multi-nozzle adhesive mixer, resulting in uniform adhesive distribution; S8, Paving: A 2mm thick surface layer of fine material is laid on the upper and lower surfaces, and the core layer of coarse material is placed in the middle to form a slab. S9, Pre-compression, pre-compressing the paved slabs to eliminate internal voids; S10, hot pressing, hot pressing is carried out in a five-section hot pressing frame. The hot pressing zone in the five-section hot pressing frame includes a high pressure zone, a pressure holding zone, a pressure holding zone one, a pressure holding and thickness fixing zone and a pressure holding zone two. S11, Cooling and post-processing: Cooling the hot-pressed boards to room temperature, trimming the edges, and then stacking and marking them. S12, conditioning, left to stand in a leveled storage yard for 48 hours; S13, Sanding and Grading: The boards are sanded to a fixed thickness, and then sorted into superior, qualified and waste boards by infrared detection.

[0029] The flue gas dryer in step S4 is 28-30 meters long and 5.8-6.0 meters in diameter. It has a Z-shaped carbon heat-conducting plate structure on its inner wall and is driven by three sets of drive rollers.

[0030] In step S7, the amount of adhesive used during application is 8-12% of the wood shavings mass, and multiple nozzles are used for simultaneous spraying, with a minimum of 3 nozzles.

[0031] In step S8, the surface fine material paving adopts dynamic airflow distribution technology to ensure that the uniformity deviation of the paving thickness is ≤0.1mm.

[0032] The hot pressing pressure in step S10 is 1.2-1.5 MPa, and the pressure in the pressure holding and thickness fixing zone is 30%-40% lower than that in the high pressure zone.

[0033] In step S10, the temperature of the high-pressure zone is 230℃, the temperature of the pressure-holding zone is 210℃, the temperature of the first pressure-holding zone is 190℃, the temperature of the pressure-holding and thickness-fixing zone is 180℃, and the temperature of the second pressure-holding zone is 170℃.

[0034] In step S13, the thickness deviation of the plate during the fixed-thickness sanding process is ≤0.05mm.

[0035] The production process of thin particleboard is as follows: S1, chipping: Wood raw materials with a moisture content of ≥40% are fed into the chipper and processed into wood chips with a length of 20–40mm to ensure uniform size of raw materials for subsequent processing.

[0036] S2, Initial screening: The wood chips are initially screened using a sieve to remove impurities such as bark, mud, sand, and dust, thereby improving the purity of the raw materials.

[0037] S3, ring planing: The screened wood chips are fed into a ring planer and processed into shavings with a length of 5–40 mm, a width of 1–20 mm, and a thickness of 0.6 mm to form basic forming units.

[0038] S4, Drying: The wood shavings are fed into a flue gas dryer for drying. The dryer is 28–30 meters long and 5.8–6.0 meters in diameter, with Z-shaped carbon heat-conducting plates (12mm thick carbon steel) on the inner wall, and is driven by three sets of drive rollers. The inlet temperature is controlled at 200℃, the outlet temperature is maintained at 120–130℃, the rotation speed is 18.5 rpm, and the drying time is adjusted to 2–6 minutes depending on the size of the wood shavings, ultimately stabilizing the moisture content of the wood shavings at 1.5–2%.

[0039] S5, secondary screening, classifies and screens the dried wood shavings into fine material for surface paving and coarse material for core filling, thus achieving material classification and utilization.

[0040] S6, Grinding: Some fine materials are further ground into powder to improve the uniformity of adhesive application and surface density.

[0041] S7. Apply adhesive: Use a high-speed, high-pressure multi-nozzle adhesive mixer to apply adhesive to the surface fine material and the core coarse material respectively. The amount of adhesive applied is 8-12% of the shavings mass. Apply the adhesive simultaneously through no less than 3 nozzles to ensure that the adhesive is distributed evenly.

[0042] S8, Paving: Paving is carried out on the paving platform using dynamic airflow distribution technology: a 2mm thick surface layer of fine material is laid on both the upper and lower surfaces, and a core layer of coarse material is filled in the middle to form a complete slab. The airflow system consists of an adjustable air pump and a perforated jet plate with an aperture of 0.5–1.0mm. The paving thickness uniformity deviation is ≤0.1mm, and the airflow distribution uniformity deviation is ≤5%.

[0043] S9, Pre-compression, is the initial pre-compression of the completed slab to eliminate internal voids, enhance structural stability, and prevent cracking or fracture during hot pressing.

[0044] S10, hot pressing, the slab is fed into a five-segment hot pressing frame for high-temperature and high-pressure forming: High-pressure zone: Pressure 1.2–1.5 MPa, temperature 230℃; Pressure holding zone: temperature 210℃; Pressure holding zone 1: Temperature 190℃; Pressure holding and thickness setting zone: Temperature 180℃, pressure reduced by 30%–40% compared to the previous section, equipped with a pressure sensor and adaptive three-stage regulating valve to precisely control the pressure relief rate and thickness tolerance; Pressure holding zone two: temperature 170℃. This achieves gradual temperature reduction and graded pressure control to prevent rebound deformation and ensure dimensional stability of the finished product.

[0045] S11, Cooling and Post-processing: After hot pressing, the boards are naturally cooled to room temperature, then trimmed, and stacked and labeled by batch for easy traceability management.

[0046] S12, curing, involves transferring the boards to a flat storage area and letting them stand for 48 hours to release internal stress and improve physical stability.

[0047] S13, Sanding and Grading: After curing, the boards are sanded to a fixed thickness with a thickness deviation of ≤0.05mm. Infrared defect detectors combined with machine vision technology are used to automatically identify internal and surface defects. The products are then divided into superior, qualified and scrap boards by an automatic sorting robot arm to complete the final quality grading.

[0048] like Figure 2 As shown, a production apparatus for thin particleboard includes: Drying system: including a flue gas dryer with a Z-shaped carbon heat-conducting plate inner wall, which is 28-30 meters long and 5.8-6.0 meters in diameter, and equipped with three sets of drive rollers; Glue application system: includes a high-speed glue mixer and a multi-nozzle glue spraying device; Paving system: including paving platforms with dynamic airflow distribution for uniform paving of surface fines; Hot pressing system: includes a five-section hot pressing frame, each section has an independently controllable temperature, and the temperature gradient is 230℃→210℃→190℃→180℃→170℃. Inspection and grading system: including infrared defect detector and automatic sorting robotic arm.

[0049] According to another embodiment of the present invention, the Z-shaped heat-conducting plate of the dryer is fixed to the inner wall by welding, and the carbon steel thickness is 12mm; the airflow distribution device of the paving system includes an air pump with adjustable wind speed and a perforated jet plate to eliminate the problem of uneven thickness of the surface paving; the perforated jet plate has a hole diameter of 0.5-1.0mm and the airflow distribution uniformity deviation is ≤5%.

[0050] According to another embodiment of the present invention, the pressure holding and thickness setting zone of the hot pressing system is equipped with a pressure sensor and an adaptive three-stage regulating valve to control the pressure release rate so as to accurately control the thickness tolerance; the detection and grading system adopts machine vision and infrared fusion technology, which can detect and sort internal defects of the plate in real time.

[0051] The production apparatus provided by this invention is specifically designed to achieve the above-mentioned efficient and stable thin particleboard manufacturing process. The workflow of its various systems operating in coordination is as follows: 1. Raw material preparation and transportation: Logs with a moisture content of ≥40% are fed into the chipper via a conveyor belt to complete the S1 chipping process and produce wood chips with a length of 20–40mm.

[0052] 2. During the initial screening, the wood chips undergo S2 initial screening via a vibrating screen device to remove non-wood impurities such as bark, mud, sand, and dust.

[0053] 3. The ring planer system is started. The screened wood chips enter the ring planer to complete the S3 process, producing standard wood shavings with a length of 5–40 mm, a width of 1–20 mm, and a thickness of 0.6 mm.

[0054] 4. Drying system operation (critical step): Wood shavings are fed into the flue gas dryer in the drying system. The dryer is 28–30m long and 5.8–6.0m in diameter, with Z-shaped carbon heat-conducting plates (12mm thick carbon steel) welded to the inner wall to enhance heat transfer efficiency; Three sets of drive rollers ensure smooth operation; Control the inlet temperature to 200℃, the outlet temperature to 120–130℃, and the main unit speed to 18.5 rpm; Adjust the residence time dynamically (2–6 minutes) according to the particle size of the wood shavings to ensure that the output moisture content is stable at 1.5–2%.

[0055] 5. Secondary screening and material diversion: After drying, the wood shavings enter the secondary screening equipment to complete S5, separating the fine material suitable for the surface layer and the coarse material for the core layer.

[0056] 6. The grinding system intervenes, and some fine materials enter the grinding mill to complete S6, transforming them into dust-like fine materials to optimize surface density.

[0057] 7. Applying adhesive system operation: The surface fine material and the core coarse material enter the applying adhesive system separately into the high-speed mixing machine; A multi-nozzle adhesive spraying device (at least 3 nozzles) sprays adhesive simultaneously, with the amount of adhesive applied controlled at 8–12%. The adhesive fully coats the surface of the particles, ensuring bonding strength and uniformity.

[0058] 8. The paving system is precisely formed, and the material enters the paving system: the dynamic airflow distribution paving platform is activated, and uniform suspended paving is achieved through an adjustable speed air pump and a multi-hole jet plate (hole diameter 0.5–1.0mm); A 2mm thick layer of fine material is laid on the top and bottom surfaces, and a core layer of coarse material is filled in the middle to form an integral slab. The paving thickness uniformity deviation is ≤0.1mm, and the airflow distribution uniformity deviation is ≤5%, laying the foundation for subsequent compaction.

[0059] 9. The pre-compression system is initially finalized. The slab enters the pre-compression machine to complete S9. Appropriate pressure is applied to remove air, enhance structural continuity, and reduce the risk of hot-compression cracking.

[0060] 10. Precision forming via hot pressing system, entering the core hot pressing system—the five-section hot pressing frame: Segmented temperature control: 230℃ → 210℃ → 190℃ → 180℃ → 170℃, gradually reducing temperature to avoid sudden changes in thermal stress; Pressure control: Initial pressure 1.2–1.5 MPa, pressure drop of 30%–40% in the pressure holding and thickness setting zone; The pressure-holding and thickness-fixing zone is equipped with a pressure sensor and an adaptive three-stage regulating valve to monitor and adjust the pressure relief rate in real time, thereby precisely controlling the consistency of the plate thickness and density.

[0061] 11. Cooling and post-processing production line: After hot pressing, the boards enter the cooling zone (S11) and are gradually cooled to room temperature. They are then trimmed neatly by the trimming machine, stacked, labeled and put into storage.

[0062] 12. After the boards are transferred to the curing area, they are left to stand in the leveled storage area for 48 hours (S12) to allow for stress release and moisture balance. 13. The intelligent sorting system processes the final products, which then enter the testing and grading system. A thickness sander can finely grind both sides of a board, with a thickness deviation of ≤0.05mm; Infrared defect detectors combined with machine vision systems scan for internal and surface defects in sheet materials; The automated sorting robot arm classifies the boards into superior, qualified, and waste boards based on the test results, realizing fully automated quality inspection and packaging.

[0063] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for producing thin particleboard, characterized in that: Includes the following steps: S1, chipping, is the process of chipping wood raw materials with a moisture content of ≥40% into wood chips with a length of 20-40mm; S2, initial screening, removes bark, mud, and dust from the wood chips through a sieve; S3, ring planing, which processes wood chips into shavings with dimensions of 5-40mm in length, 1-20mm in width, and 0.6mm in thickness; S4, Drying: Drying is carried out in a flue gas dryer with an inlet temperature of 200℃ and an outlet temperature of 120-130℃. The dryer speed is 18.5 rpm, and the drying time is adjusted to 2-6 minutes depending on the size of the wood shavings. The moisture content after drying is controlled at 1.5-2%. S5, secondary screening, separates the dried wood shavings into surface fines and core coarses; S6, Grinding, grinding some of the fine materials into powdery fine materials; S7, applying adhesive: applying adhesive to the surface fine material and the core coarse material separately using a high-speed, high-pressure multi-nozzle adhesive mixer, resulting in uniform adhesive distribution; S8, Paving: A 2mm thick surface layer of fine material is laid on the upper and lower surfaces, and the core layer of coarse material is placed in the middle to form a slab. S9, Pre-compression, pre-compressing the paved slabs to eliminate internal voids; S10, hot pressing, hot pressing is carried out in a five-section hot pressing frame. The hot pressing zone in the five-section hot pressing frame includes a high pressure zone, a pressure holding zone, a pressure holding zone one, a pressure holding and thickness fixing zone and a pressure holding zone two. S11, Cooling and post-processing: Cooling the hot-pressed boards to room temperature, trimming the edges, and then stacking and marking them. S12, conditioning, left to stand in a leveled storage yard for 48 hours; S13, Sanding and Grading: The boards are sanded to a fixed thickness, and then sorted into superior, qualified and waste boards by infrared detection.

2. The method for producing thin particleboard as described in claim 1, characterized in that: The flue gas dryer in step S4 is 28-30 meters long and 5.8-6.0 meters in diameter. It has a Z-shaped carbon heat-conducting plate structure on its inner wall and is driven by three sets of drive rollers.

3. The method for producing thin particleboard as described in claim 1, characterized in that: In step S7, the amount of adhesive used during application is 8-12% of the wood shavings mass, and multiple nozzles are used for simultaneous spraying, with a minimum of 3 nozzles.

4. The method for producing thin particleboard as described in claim 1, characterized in that: In step S8, the surface fine material paving adopts dynamic airflow distribution technology to ensure that the uniformity deviation of the paving thickness is ≤0.1mm.

5. The method for producing thin particleboard as described in claim 1, characterized in that: The hot pressing pressure in step S10 is 1.2-1.5 MPa, and the pressure in the pressure holding and thickness fixing zone is 30%-40% lower than that in the high pressure zone.

6. The method for producing thin particleboard as described in claim 1, characterized in that: In step S10, the temperature of the high-pressure zone is 230℃, the temperature of the pressure-holding zone is 210℃, the temperature of the first pressure-holding zone is 190℃, the temperature of the pressure-holding and thickness-fixing zone is 180℃, and the temperature of the second pressure-holding zone is 170℃.

7. The method for producing thin particleboard as described in claim 1, characterized in that: In step S13, the thickness deviation of the plate during the fixed-thickness sanding process is ≤0.05mm.

8. A production apparatus for thin particleboard, characterized in that: include: Drying system: including a flue gas dryer with a Z-shaped carbon heat-conducting plate inner wall, which is 28-30 meters long and 5.8-6.0 meters in diameter, and equipped with three sets of drive rollers; Glue application system: includes a high-speed glue mixer and a multi-nozzle glue spraying device; Paving system: including paving platforms with dynamic airflow distribution for uniform paving of surface fines; Hot pressing system: includes a five-section hot pressing frame, each section has an independently controllable temperature, and the temperature gradient is 230℃→210℃→190℃→180℃→170℃. Inspection and grading system: including infrared defect detector and automatic sorting robotic arm.

9. The production apparatus for thin particleboard as described in claim 8, characterized in that: The Z-shaped heat-conducting plate of the dryer is fixed to the inner wall by welding, and the carbon steel thickness is 12mm; the airflow distribution device of the paving system includes an air pump with adjustable wind speed and a perforated jet plate to eliminate the problem of uneven thickness of the surface paving; the perforated jet plate has a hole diameter of 0.5-1.0mm and the airflow distribution uniformity deviation is ≤5%.

10. The production apparatus for thin particleboard as described in claim 8 or 9, characterized in that: The pressure holding and thickness setting zone of the hot pressing system is equipped with a pressure sensor and an adaptive three-stage regulating valve to control the pressure release rate and accurately control the thickness tolerance; the detection and grading system adopts machine vision and infrared fusion technology to detect and sort internal defects of the sheet material in real time.

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