A kind of production method of low-aldehyde flame-retardant plywood

Abstract

The invention relates to a plywood, in particular to a production method of a low-aldehyde flame-retardant plywood. The process steps of its production include: plank rotary blade—primary drying—repair—vacuum impregnation treatment—secondary drying—gluing—prepressing—hot pressing—edge trimming and sanding. The invention uses a flame retardant solution to vacuum impregnate the veneer. After the impregnation process, the flame retardant penetrates into the cell cavity, cell wall and intercellular space of the wood to obtain a flame retardant veneer, which is used to produce plywood. The flame retardant performance of the produced plywood has been improved; by improving the urea-formaldehyde resin adhesive used, the residual amount of formaldehyde in the adhesive is reduced, thereby reducing the residual amount of formaldehyde in the plywood; The burning agent borax solution improves the flame retardancy of the urea-formaldehyde resin adhesive used. Using this adhesive to produce plywood not only reduces the residual amount of formaldehyde in the plywood but also further improves the flame retardancy of the plywood.

Description

technical field [0001] The invention relates to a plywood, in particular to a production method of a low-aldehyde flame-retardant plywood. Background technique [0002] Plywood is an important type of wood-based panel. The plywood currently on the market is a three-layer or multi-layer board-like material that is cut into veneers by wood segments or sliced ​​into thin wood by wood squares, and then glued with adhesives. It is usually made of odd-numbered veneers, and the fiber directions of adjacent veneers are glued perpendicular to each other; plywood is widely used in architectural decoration, furniture manufacturing, wooden door manufacturing, Floor manufacturing, marine and vehicle interior finishing. [0003] However, since plywood is a kind of wood material, it has a high combustion calorific value, a low combustion temperature and a fast flame propagation speed. It is a combustible material and there is a fire hazard. Therefore, it is necessary to carry out flame r...

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Problems solved by technology

[0004] The existing flame-retardant plywood mainly has the following problems: the flame-retardant effect is not good, when it is burned in a fire, the wood veneer peels off layer by layer, the carbonized layer cracks, and the carbonization speed is fast, usually 0.8mm / min-1.3mm / min ; Compared with ordinary plywood of the same specification, the mechanical properties are reduced by 15% to 45%; the hygroscopicity increases, which cannot meet the processing and use requirements; The concentration of the concentration increases, which increases the hazards of the smoke in the fire

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