The methods of plywood production are generally divided into three kinds: wet – heat method, dry – cold method and dry – heat method. Dry and wet refers to the glue used when the veneer is dry veneer or wet veneer. Cold and hot refers to the use of hot or cold pressure gluing.
The disadvantage of wet heat production is: because of the high moisture content of the veneer, the hot pressing time is long, the productivity is low, and the plywood has to be dried after hot pressing. Because it is the plate produced by the wet heat method, the internal stress is large, easy to warping deformation, and the bonding strength is low.
The disadvantage of dry and cold production is: because of the long pressurization time, the production cycle of plywood is long. It is suitable for the production of small enterprises.
Dry heat production method: the single board is dried with rotary cutting, so that the moisture content of the single board is within the range of 8-12% of the rubber group blank, in the hot press rubber pressed into the board. The production characteristics of this method are: because it is high temperature gluing, so the time is short, the output is large, and the gluing strength is high, the product quality is good. The surface of the board is smooth and flat, not easy to be deformed. Suitable for all kinds of adhesive production.
Because this method overcomes the shortcomings of wet – heat method and dry – cold method. Production is more flexible, large, medium and small enterprises can produce, the products produced are more suitable for the needs of the market, therefore, the plywood produced by domestic and foreign enterprises at present is commonly used dry heat production method.
Post time: Nov-24-2020