Why Is Dry Heat Method Often Used To Produce Plywood?

The production methods of plywood are generally divided into three types: wet heat method, dry cooling method and dry heat method. Dry and wet refers to whether the veneer used in the glue pressing is dry or wet. Cold and hot refers to gluing with hot or cold pressing.

The disadvantages of wet heat production are:

Because the moisture content of the veneer is high, the hot pressing time is long and the yield is low. After the hot pressing, the plywood needs to 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 disadvantages of the dry cooling method are:

Because the pressing time is long, the production cycle of plywood is long. It is more suitable for the production of small enterprises.

Dry-heat production: The rotary-cut veneer is dried so that the moisture content of the veneer is in the range of 8% to 12%.

The characteristics of this method are:

Because it is high temperature gluing, the time is short, the output is large, and the gluing strength is high, and the product quality is good.

The board surface is smooth and flat, not easy to deform.

Suitable for the production of various types of adhesives.

Because this method overcomes the shortcomings of the wet heat method and the dry cooling method. The production is more flexible and can be produced by large, medium and small enterprises, and the products produced are more suitable for the needs of the market. Therefore, the plywood produced by various enterprises at home and abroad is currently produced by the dry heat method.