Introduction To The Production Process Of Multi-layer Wood Boards
The initial production process involves processing the logs. High-pressure spray systems are installed along the transport corridor to remove surface sediment. A centering device adjusts the logs' longitudinal roundness before they enter a fully automatic debarking machine, where circular cutters operate to remove the bark to a precision depth of less than 3 mm.
After rough processing, the logs are transported to a temperature-controlled soaking tank for processing. The tank temperature is set between 40°C and 45°C, softening the wood fibers for 36-48 hours. The soaking time is dynamically adjusted based on the hardness index of each tree species. A high-frequency vibration separator is installed at the end of the processing line to separate out low-quality material caused by rot and scabs.
Large-diameter logs over 60 cm in diameter enter the segmented operation table. An intelligent recognition system scans and analyzes the grain direction, and a double-blade circular saw optimizes the cut, maximizing yield while maintaining the fiber's direction.
The precision peeling process requires maintaining a constant temperature and humidity in the factory. The computer-controlled rotary cutting trolley operates at a constant feed rate of 30 cm per minute. The tool angle is set between 19.5 and 22 degrees to accommodate different board requirements, ensuring a dimensional tolerance of ±0.15 mm in the final veneer.
The precision rotary cutting process requires maintaining constant temperature and humidity in the factory. The computer-controlled rotary cutting trolley operates at a constant feed rate of 30 cm per minute. The tool angle is set between 19.5 and 22 degrees to accommodate different board requirements, ensuring a dimensional tolerance of ±0.15 mm in the final veneer.
The drum dryer's mesh belt conveyor system moves the boards. The three-zone intelligent temperature control system sets target temperatures for initial dehydration at 200°C, mid-stage adjustment at 150°C, and final curing at 90°C. Infrared sensors monitor the moisture content curve in real time, ensuring the final product meets the required 6%-8% moisture content control window through an automatic feedback mechanism.
The CNC coating machine operates within a preheated operating temperature range of 60°C. A 7:3 ratio of ring-modified resin and phenol curing agent is used as the base adhesive, with the coating weight controlled by a magnetic pump to a minimum of 160 ± 5 grams per square meter. The robotic arm's assembly and splicing process adheres to a standard thickness difference of no more than 0.2 mm between adjacent panels, ensuring an alternating pattern of longitudinal and diagonal grain.
The hydraulic hot press maintains uniform force between layers during pre-forming. The heat source system features ten circulating heating paths. While maintaining a pressure of 15 MPa, the heating plate increases the temperature at a gradient of 2°C/minute to a peak of 135°C. The holding stage parameters are strictly timed to accommodate multi-layer systems. A twelve-layer base panel system requires a standard processing time of approximately 18.5 minutes.
The semi-finished products from the assembly line are stored in a light-proof and oxygen-proof curing room. The brackets are arranged with six supports to facilitate natural leveling. A 24-hour constant humidity system ensures a stable and standard moisture content. A constant temperature conditioning cycle of 2-9 days is determined depending on the panel quality. A full-width, fixed-thickness sanding unit performs secondary surface texture correction. A four-stage sanding module, increasing in grit from 200 to 800, provides continuous polishing from basic to fine polishing. A pulsed suction device promptly processes 0.8 tons/hour of grinding debris. A laser detector generates a 3D topological verification map of the surface density distribution.
The final inspection process includes an eight-step inspection process. A stress tester performs a 200N force penetration test on the substrate, and a formaldehyde emission test chamber performs an environmental review module in accordance with GB/T984. Products involved in packaging and storage undergo a 72-hour intermittent micro-environmental temperature resistance test.
The monitoring list for key production nodes requires equipment equipped with a status labeling system. Spindle lubrication and temperature control testing on rotary cutters ensures a constant operating temperature of 52°C. Adhesive preparation records ensure the accuracy of mixing parameters is calibrated every two hours. The quality control center updates the baseline change model for the moisture sensitivity index and temperature response curve daily.
The environmental protection joint control system encompasses three governance branches. The negative pressure recovery tower in the colloid mixing room maintains a volatile matter capture rate exceeding 95%. The grinding dust cyclone separation channel is equipped with a secondary filter bag. The wastewater treatment process utilizes a dual-effect degradation process chain consisting of a P neutralizer and microbial strains.
The dynamic control strategy currently employed in the industry has achieved a breakthrough in optimizing production line flow rates by an average of 14 seconds while maintaining board bond strength standards. Process parameter correction indicators, including phase calibration of glue dilution, achieve milliliter-level parameter adjustment. These systematic advancements support modern quality management, achieving a level 1.55 times the industry standard. The intelligent data control platform for production management can effectively reduce heat energy loss by 28% and redundant raw material consumption by 47%.
