Plywood production methods are generally divided into three methods: wet heat method, dry cold metho

2020-07-13

Plywood production methods are generally divided into three methods: wet heat method, dry cold method and dry heat method. Dry and wet refers to whether the veneer used in gluing is dry veneer or wet veneer. Cold and hot refers to hot pressing or cold pressing. Plywood production methods are generally divided into three methods: wet heat method, dry cold method and dry heat method. Dry and wet refers to whether the veneer used in gluing is dry veneer or wet veneer. Cold and hot refers to hot pressing or cold pressing.


The disadvantages of the wet heat method are: because the moisture content of veneer is high, the hot pressing time is long and the productivity is low. After hot pressing, the plywood must be dried. Because it is produced by wet heat method, it has high internal stress, easy warpage and low bonding strength.


The disadvantage of dry cooling method is that the production cycle of plywood is long because of the long pressing time. It is suitable for the production of small enterprises.


Dry heat production: the veneer with rotary cutting is dried, and the moisture content of veneer is 8-12%. Then, the veneer is glued to form a plate in a hot press. The production characteristics of this method are as follows: because of the high temperature gluing, 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 deform. It is suitable for all kinds of adhesive production.


This method overcomes the shortcomings of the wet heat method and the dry cooling method. Production is more flexible, large, medium and small enterprises can produce, the products are more suitable for the needs of the market, therefore, at present, domestic and foreign enterprises commonly produce plywood by dry heat method