A kind of heat treatment plywood and veneer and its production process

Abstract

The invention relates to thermally-treated plywood and a thermally-treated veneer, and a production technique of the plywood and the veneer. The production technique comprises the following steps: directly arranging a veneer which is not naturally dried or oven-dried into a closed oxygen-free container; heating the environment in the container to the temperature of 170 to 210 DEG C; maintaining the temperature within the highest temperature region for 2-4 hours and then cooling; taking the veneer out of the oxygen-free container when the difference of the temperature in the oxygen-container and the external environmental temperature is smaller than 30 DEG C; drying the veneer which is subjected to high-temperature thermal treatment; gluing the dried veneer and performing subsequent treatment processes to finish the production process. The water content of the plywood produced by the technique disclosed by the invention is tested to be smaller than or equal to 6% under room temperature condition; mechanical properties such as density, hardness and strength of the plywood can be improved according to needs; meanwhile, the stability and durability of wood are improved; the plywood is enabled to have the effects of preventing damages caused by worms and eliminating internal stress of wood, and being moisture-proof, low in moisture absorptivity, mildew-proof, resistant to deformation, resistant to cracking, stable in size, smooth in texture and capable of removing grease; the aim of totally improving the performances of the plywood is achieved.

Description

technical field [0001] The invention belongs to the field of plywood production, and in particular relates to a heat-treated plywood and veneer and a production process thereof. Background technique [0002] Wood is a porous and complex natural organic substance mainly composed of cellulose, hemicellulose and lignin, and its main components are usually referred to as wood fiber, xylose and lignin; wood molecules contain a large number of hydroxyl groups and hydroxymethyl groups Oxygen-containing polar groups, so it has the characteristics of strong hygroscopicity, perishability and chemical degradation; in addition, nutrients such as xylose in hemicellulose are easy to breed parasites and damage the wood structure. [0003] In view of the above characteristics of wood, the existing plywood production technology includes veneer drying, anti-corrosion, adding drugs and insecticides, etc., but these technologies can only improve one or several properties of wood, and cannot com...

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Problems solved by technology

[0004] Therefore, in view of the above situation, in order to solve the problems that the existing plywood production process cannot fully improve the wood performance, is not environmentally friendly and has poor weather resistance, the present invention uses wood veneers to degrade hemicellulose with strong hygroscopicity under high temperature and low pressure conditions to produce furfural and other substances. , to reduce the hydrogen bond between wood molecules and water molecules, and at the same time reduce the concentration of wood hydroxyl and the ability to exchange with external water molecules, change the water adsorption mechanism of wood, and reduce the moisture absorption and water absorption performance

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