The production methods of Poplar Coffin are generally divided into three categories: moist heat method, dry cooling method, and dry heat method. Dry and wet refer to whether the veneer used for gluing is dry veneer or wet veneer. Cold and hot refer to hot pressing or cold pressing.
The disadvantages of damp heat production are: due to the high moisture content of the veneer, the hot pressing time is long and the productivity is low. After the hot pressing, the Poplar Coffin must be dried. Because it is a board produced by the damp heat method, the internal stress is large, it is easy to warp and deform, and the bonding strength is low.
The disadvantage of dry-cooling production is: due to the long press time, the production cycle of Poplar Coffin is long. More suitable for the production of small enterprises.
Dry heat production: the veneer is dried by the rotary cut, so that the moisture content of the veneer is in the range of 8-12%, and the blank is glued and pressed into a board in a hot press. The production characteristics of this method are: due to the high temperature bonding, the time is short, the output is large, and the bonding strength is high, and the product quality is good. The surface of the board is smooth and flat, and it is not easy to be deformed. It is suitable for the production of various types of adhesives.
Because this method overcomes the shortcomings of the wet heat method and dry cooling method. The production is more flexible and can be produced by large, medium and small enterprises. The products produced are more suitable for the needs of the market. Therefore, the poplar plywood produced by domestic and foreign enterprises is commonly produced by dry heat.
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