How is plywood made in factory
Plywood, as an important board widely used in various fields such as construction, furniture, and transportation, integrates precision craftsmanship, advanced equipment, and careful selection of raw materials in its production process.
1、 Raw material selection and preparation
The manufacturing of plywood begins with careful selection of raw materials. The raw materials suitable for producing plywood mainly include various woods such as oak, water chestnut, birch, elm, poplar, as well as other fiber materials such as bamboo and reed. These raw materials need to undergo strict processes such as peeling, pruning, planing, etc. to achieve the specified size and surface smoothness. This step is crucial as it directly affects the quality and efficiency of subsequent processing.
2、 Drying of raw materials
The processed raw materials will 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 stability and durability. During the drying process, temperature and time need to be precisely controlled to avoid overheating causing wood cracking or insufficient drying that affects product quality.
3、 Preparation of adhesive solution
Adhesive solution is the key to bonding between the layers of plywood. The factory will mix urea formaldehyde, phenolic, epoxy resin and other adhesive raw materials in a certain proportion according to different needs, and form a uniform adhesive solution by heating and stirring. The preparation of adhesive solution requires strict control of various parameters, such as pH value, viscosity, etc., to ensure its good bonding performance and environmental friendliness.
4、 Board making
Board making is the core process of plywood production. The dried and processed raw materials are placed on a plate making machine, and the surface is uniformly coated with pre prepared adhesive solution. Subsequently, these veneers were stacked to a certain thickness and layers, forming an unformed plywood. During the stacking process, it is necessary to ensure that the texture directions of each layer of veneer are perpendicular to each other to enhance the overall strength and stability of the board.
5、 Hot pressing
The unformed plywood is sent to a hot press machine for hot pressing treatment. A hot press machine solidifies the adhesive solution under hot pressing by heating and applying a certain pressure, thereby tightly bonding the layers of veneer together. During the hot pressing process, parameters such as temperature, pressure, and time need to be precisely controlled to ensure that the plywood meets the specified physical properties and appearance quality. In addition, attention should be paid to controlling the pressure reduction speed to avoid defects such as bubbling.
6、 Organize
After hot pressing, the board needs to undergo deburring, cutting, polishing and other finishing work to make its surface flat and meet the required specifications and dimensions. This step not only enhances the aesthetics of the product, but also ensures its stability and durability in subsequent use.
7、 Testing and packaging
The plywood produced needs to undergo strict quality testing, including indicators such as board thickness, flatness, and strength. Only products that meet the requirements can be packaged and sold. During the packaging process, appropriate protective measures should be taken to avoid damage to the board during transportation and storage.
8、 Application of production equipment
In the production process of plywood, various advanced mechanical equipment plays an important role. For example, the dryer ensures precise control of the moisture content of raw materials; The hot press achieves high-quality bonding of plywood through precise temperature and pressure control; And equipment such as sawing machines and sanding machines ensure the specifications, dimensions, and surface quality of the products. In addition, with the development of technology, more and more automated and intelligent equipment is being introduced into plywood production lines, further improving production efficiency and product quality.
9、 Environmental Protection and Sustainable Development
Environmental protection and sustainable development are also important aspects that cannot be ignored in the production process of plywood. Factories must strictly comply with national environmental regulations and take effective measures to reduce the discharge of wastewater, exhaust gas, and solid waste. At the same time, measures such as rational utilization of wood resources and improving wood utilization efficiency are taken to promote the sustainable development of forestry resources.
The manufacturing process of plywood in factories is a complex and intricate system engineering. From raw material selection to finished product packaging, every step requires strict control of various parameters and process conditions to ensure the quality and performance of the product. With the continuous advancement of technology and the increasing awareness of environmental protection, the production process and equipment of plywood are also constantly optimized and upgraded, providing higher quality and environmentally friendly board products for various industries.
