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Aldehyde-free veneer and producing method thereof

A manufacturing method and technology of plywood, applied in the direction of manufacturing tools, chemical instruments and methods, wood layered products, etc., can solve the problem of high cost of plywood, achieve the effect of reducing hot pressing time, reducing hot pressing pressure, and reducing costs

Active Publication Date: 2014-04-02
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, isocyanate is only used as a curing agent for other adhesives. The sizing method used is the roller sizing method, and the sizing amount is generally 200-350g / m 2 , the addition of isocyanate in the prior art is generally between 10-20%, and its addition amount is 20-70g / m 2 Between, plus other adhesives, the cost of plywood produced by existing technology is relatively high

Method used

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  • Aldehyde-free veneer and producing method thereof
  • Aldehyde-free veneer and producing method thereof
  • Aldehyde-free veneer and producing method thereof

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Embodiment

[0066] According to the results, select the following process parameters: the amount of sizing is 20g / m 2 ; The moisture content of the slab is 20%; no aging; the hot pressing temperature is 105g / m 2 The hot pressing pressure is 1.0Mpa; the hot pressing time is 1.0min / mm; poplar, birch, and eucalyptus veneers are used as materials respectively, and three-layer plywood is made with isocyanate adhesive. According to GB / T9846.3-2004, the bonding strength, wood breakage rate and formaldehyde emission of plywood were tested, and compared with the formaldehyde emission of poplar, birch and eucalyptus. The results are shown in Table 7.

[0067] Table 7 Experimental results of bonding strength of several types of plywood

[0068] Eucalyptus veneer: 2500cm×1300cm×0.5cm Poplar veneer: 2500cm×1300cm×0.2cm; Birch veneer: 2500cm×1300cm×0.14cm; Eucalyptus veneer: 2500cm×1300cm×0.2cm.

[0069]

[0070] It can be seen from Table 7 that the bonding strength of the wood in 3 is higher than...

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Abstract

The invention provides an aldehyde-free veneer which comprises a plurality of combined single plates, the contiguous layers of the single plates are in a crossed structure or a parallel structure, a glue layer is arranged between contiguous single plates, and the adhesive of the glue layer is isocyanate. The invention also includes the producing method of the aldehyde-free veneer. In the normal producing method of veneer, isocyanate adhesive is used, the hot pressing time in the work procedures is shortened, the hot pressing temperature is lowered, and the requirement of the water content of the single plate is lowered. Spraying glue application method is used in the work procedure of applying glue to the veneer to greatly reduce the applied glue amount of the veneer, thus besides the formol release amount is greatly lower than that of the relevant standard, and the aldehyde-free veneer also has more reasonable technology.

Description

technical field [0001] The invention belongs to the field of plywood and its manufacturing technology in the wood-based panel industry, and relates to a formaldehyde-free plywood and a manufacturing method thereof. Background technique [0002] Plywood is an indispensable and important part of the wood-based panel industry, and an important means to realize the sustainable development strategy of forestry and effectively utilize timber resources. In 2007, my country's plywood output reached 35.6156 million cubic meters, an increase of 30.52% over 2006, accounting for 40.29% of the total wood-based panel output; more than 85% of my country's plywood is used as furniture and interior decoration materials, and the main adhesive used in plywood production is urea-formaldehyde Resin adhesives, followed by phenolic resin adhesives and melamine-modified urea-formaldehyde resin adhesives. These kinds of adhesives are all aldehyde adhesives, and the most prominent problem is that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27D1/04B32B21/13
Inventor 于文吉余养伦祝荣先周月任丁华
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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