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Production process for formaldehyde-free multiply plywood

A production process and technology for plywood, which is applied to other plywood/plywood appliances, bonding of wooden veneers, manufacturing tools, etc., can solve the problems of complex process, high production cost, short service life, etc., to increase the contact area, improve the Water resistance, polarity enhancement effect

Inactive Publication Date: 2017-07-14
ANHUI FUYANG QINGLIN WOOD PROD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the development and research of environmental-friendly wood adhesives, it has great potential, but at the same time it also has the disadvantages of high production cost, complicated process and short pot life, which makes its application in the wood-based panel industry restricted. limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] A production process of formaldehyde-free multilayer plywood, comprising the following process steps:

[0031] (1) Cold plasma treatment: screen the core board, cut it into the required size board, after drying in the oven, put it into the temperature and humidity control box to adjust the water content to 6%, and then cool the surface of the veneer under normal pressure after taking it out. Plasma treatment, processing power 4.5kW, processing speed 14m / min;

[0032] (2) Adhesive coating on both sides of the veneer: apply blocked isocyanate modified soybean protein adhesive on the surface of the pretreated veneer, and the amount of glue on both sides is 320g / m 2 , calculated according to the area of ​​the slab, the glue must be evenly applied;

[0033] (3) Blank assembly: superimpose multiple veneers after gluing, and control the thickness to 10-12mm for blank assembly;

[0034] (4) Hot pressing forming: fix the prepared slab on the mold sleeve of the pressing machine...

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PUM

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Abstract

The invention discloses a production process for formaldehyde-free multiply plywood. The production process mainly includes the following steps of cold plasma processing, double-sided gluing of single boards, assembly, hot-press molding, contact calibrating, gluing and veneering, veneer hot pressing, edge sawing, sanding and finished product obtaining. According to the production process, under a high-temperature hot-pressing action of the boards, after isocyanate modified soy protein adhesive is unblocked, the activity of -NCO radials of isocyanate is recovered, and the -NCO radials carry out a cross-linking reaction with degraded soy protein and wood, so that a uniform space mesh structure is formed, the cohesion strength is improved, formation of stable chemical bonds on the surface of the soy protein and the surface of the wood can be facilitated, and thus water resistance of the soy protein based adhesive is improved.

Description

technical field [0001] The invention relates to a wood preparation method, in particular to a production process of formaldehyde-free multilayer plywood. Background technique [0002] At present, most of the adhesives used in plywood and decorative plywood products on the market are adhesives containing formaldehyde. The products release a large amount of free formaldehyde during production and use, causing indoor air pollution and posing a great threat to the health of producers and consumers. Environmentally friendly wood adhesives made from renewable biomass resources are widely valued by people. Among them, soybean protein (PSP) has become an ideal wood adhesive due to its rich resources, renewable and environmental protection. raw material. [0003] The natural PSP molecule has a compact spherical structure, the hydrophobic groups in the molecule are wrapped inside the spherical structure, and the hydrophilic groups (such as amino, hydroxyl and carboxyl groups, etc.) a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D5/00B27D1/04B27K5/00C09J175/04C08G18/80C08G18/64
CPCB27K5/002B27D1/04B27D5/00B27D5/006C08G18/6446C08G18/8064C09J175/04
Inventor 汤瀚袁京金贺祖高唱段曙光
Owner ANHUI FUYANG QINGLIN WOOD PROD CO LTD
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