How to produce and process plywood
Plywood is a common building material that is made by bonding multiple layers of wood chips or wood fibers with a binder. Plywood has the advantages of high strength, good durability, and not easily deformed, so it is widely used in the construction, furniture manufacturing, and packaging industries. The following is a detailed introduction to the production and processing process of plywood:
Preparation of raw materials
The main raw materials for plywood include wood, adhesives, and other auxiliary materials. Wood is usually made from sawn wood, leftover wood, or forestry waste, which is processed and cut into thin pieces or sawdust of appropriate size.
Preliminary processing
Raw material inspection and classification: The wood arriving at the factory will first be inspected to remove problematic wood and impurities. Then classify and archive the wood according to its type and quality for future use.
Cutting and trimming: Wood that meets the requirements is cut and trimmed into thin pieces or sawdust. The size and thickness of these wood chips can be adjusted according to the required plywood specifications.
Adhesive application
Selection of Adhesives: Adhesives commonly used in plywood production include urea formaldehyde resin, phenolic resin, urea formaldehyde resin, etc. The choice of adhesive depends on the purpose of the plywood and the legal and regulatory requirements of the region.
Adhesive coating: Apply a layer of adhesive evenly on the surface of wood chips or sawdust. The method of coating adhesive can be roller coating, spray coating, or impregnation.
Hot pressing molding
Stacked wood chips: Wood chips or sawdust coated with adhesive are stacked in a certain order and direction to form a predetermined plywood structure.
Hot pressing: Place the stacked wood chips into a preheated plywood hot press. The temperature and pressure of hot pressing are adjusted according to the adhesive used and the required specifications of the plywood, usually under high temperature and pressure, to ensure that the adhesive can effectively bond the wood chips.
Cooling and trimming: After hot pressing, the plywood will be rapidly cooled through a cooling system to ensure its structural stability. Afterwards, the surface of the plywood will be repaired to ensure its flatness and aesthetics.
Inspection and packaging
Quality inspection: The produced plywood will undergo quality inspection to check whether its dimensions, strength, and appearance meet the requirements.
Packaging and storage: Qualified plywood will be packaged, usually using plastic film or wooden boxes to prevent damage during transportation and storage. After packaging, the plywood will be sent to the warehouse or directly transported to the customer's site.
Environmental and sustainability considerations
In the production process of plywood, special attention should be paid to environmental protection and sustainability issues. Reasonable utilization of wood resources, selection of environmentally friendly adhesives, and reduction of energy consumption can help reduce the environmental impact of the production process and extend the service life of plywood.
As an important building material, the production and processing process of plywood involves multiple links, and it is necessary to strictly control the quality and parameters of each step to ensure the performance and durability of the final product. With the advancement of technology and the enhancement of environmental awareness, the production process of plywood is constantly optimized to meet the needs of the market and environment.
