What is the production and processing process of plywood
Plywood, as a widely used material in the fields of construction, furniture, and packaging, requires multiple stages in its production and processing process, from raw material selection to final product packaging, each step is crucial. The production and processing process of plywood is as follows:
1、 Raw material selection and preparation
The raw materials for plywood mainly include various types of wood and other fiber materials, such as bamboo, reeds, etc. These raw materials need to undergo processes such as peeling, pruning, planing, etc. to achieve the required dimensions and surface smoothness. The quality of raw materials directly affects the finished quality of plywood, therefore, choosing high-quality and defect free raw materials is crucial.
2、 Drying of raw materials
The raw materials that have undergone preliminary processing need to be sent to a dryer for drying treatment to control their moisture content. Usually, it is necessary to reduce the moisture content to below 10% to ensure that the plywood produced has good quality. During the drying process, it is necessary to strictly control the temperature and time to avoid deformation or cracking of the raw materials due to excessive drying.
3、 Preparation of adhesive solution
Glue is the key to bonding plywood. Mix various adhesive materials such as urea formaldehyde, phenolic, epoxy resin, etc. in a certain proportion, and heat and stir to form a uniform adhesive solution. The quality of adhesive preparation directly affects the bonding strength and durability of plywood.
4、 Board making
Board making is the core process of plywood production. Place the processed and dried raw materials on the plate making machine, then evenly apply adhesive solution on the surface, and stack them into a certain thickness and layer to form an unformed plywood. During the board making process, it is necessary to ensure even distribution of adhesive between each layer of raw materials to ensure the overall strength of the plywood.
5、 Hot pressing
Send the unformed plywood into a hot press machine for hot pressing treatment. Under the action of heating and applying a certain pressure, the adhesive liquid solidifies under hot pressing, while tightly bonding the raw materials of each layer into one. During the hot pressing process, it is necessary to strictly control the temperature, pressure, and time to ensure the bonding quality and overall strength of the plywood.
6、 Organize
After hot pressing, the board needs to be treated with deburring, cutting, polishing, etc. to make its surface flat and meet the required specifications and dimensions. During the sorting process, it is necessary to ensure that the edges and corners of the board are neat and the surface is smooth, in order to improve the aesthetics and market competitiveness of the product.
7、 Testing and packaging
Conduct quality inspection on the produced plywood, such as testing the thickness, flatness, strength, and other indicators of the board surface. Package and sell items that meet the requirements. The testing and packaging processes are key to ensuring product quality and meeting customer needs. Through strict quality inspection, non-conforming products can be detected and processed in a timely manner to prevent them from entering the market. Meanwhile, proper packaging can protect products from damage during transportation and storage.
8、 Processing process losses
During the entire production process of plywood, processes such as sawing of logs, rotary cutting of veneers, drying of veneers, veneer finishing, hot pressing, edge cutting, and sanding can all cause damage to the wood. These losses are divided into tangible losses (such as processing residues) and intangible losses (such as shrinkage and compression). The loss of timber is related to factors such as the type of timber, timber specifications, equipment condition, process technology, and finished board specifications. Therefore, in the production process, it is necessary to continuously optimize processes and technologies, reduce loss rates, and improve raw material utilization.
The production and processing process of plywood is a complex and delicate process that requires strict control over the quality and process parameters of each link. By continuously optimizing production processes and technological means, product quality and production efficiency can be improved, market demand can be met, and the sustainable development of the plywood industry can be promoted.
