plywood production principle and glue types

First, the production principle of plywood
Plywood is a kind of plate made of multi-layer thin wood board and glue, and the strength and stability of the plate are enhanced by cross-crossing and lamination. The production process mainly includes the following steps:
1. Raw material treatment: the wood raw materials are treated and trimmed to meet the standard requirements.
2. Cutting wood: The treated wood raw materials are cut according to a certain size and specifications to make a multi-layer thin wood board.
3. Glue: Apply the glue evenly on the surface of the wood board, so that it can be bonded under high temperature and high pressure.
4. Laminated pressing: the multi-layer wood board is laminated in accordance with the specified order and direction, and then put into the press for high temperature and high pressure pressing, so that the board is bonded together.
5. Finishing and cutting: the pressed sheet is neatly trimmed and trimmed to the required shape and size.
Two, commonly used types of glue
1. Polyurethane glue: polyurethane glue is a kind of high-strength and efficient glue, with strong adhesion, water resistance, high temperature resistance and ultraviolet resistance, and is often used for bonding hard materials.
2. Phenolic glue: phenolic glue is a kind of glue with long life, low cost and wide use. It has the characteristics of moisture resistance, high temperature resistance and acid and alkali resistance, and is often used in furniture, building materials and other fields.
3. Epoxy resin glue: Epoxy resin glue is a kind of glue with high strength, high hardness and high wear resistance, which has the characteristics of corrosion resistance, moisture resistance, high temperature resistance and oil resistance. It is often used in automobiles, ships, electronic components and other fields.
Third, the characteristics and use of glue
1. The amount of glue: the amount of glue directly affects the strength and uniformity of the plate, in general, it should be adjusted reasonably according to actual needs.
2. Temperature and humidity: the use of glue environment should maintain the appropriate temperature and humidity, generally speaking, the use of glue temperature should be above 10 ° C, humidity should be between 50% and 80%.
3. Pressure and time: During the pressing process, reasonable adjustments should be made according to the characteristics of the glue and the working state of the pressing machine. In general, the pressing time should be between 30 minutes and 1 hour, and the pressure should be above 1.0Mpa.
In short, choose different types of glue and use methods, you can make different uses and quality of plywood, readers in the selection and use of plywood in the process, should be based on actual needs and requirements for reasonable selection and use.