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Production method for damp-proof full-eucalyptus laminated wood veneer

A production method and veneer technology, which are used in the joining of wooden veneers, veneer presses, plywood presses, etc., can solve the problem of increased sizing, difficulty in releasing formaldehyde, and unacceptable costs. and other problems, to achieve the effect of less residue, improved moisture resistance and less formaldehyde emission

Active Publication Date: 2013-11-27
莫明鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the amount of sizing increases, and the formaldehyde emission is difficult to meet the national standard for formaldehyde emission
Formaldehyde-free adhesive is used, and the cost is unacceptable

Method used

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  • Production method for damp-proof full-eucalyptus laminated wood veneer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First prepare the adhesive, add formaldehyde to the reaction kettle, adjust the pH value to 2-2.5 with formic acid, add polyvinyl alcohol with 0.5-0.6% formaldehyde weight, add urea with 10% formaldehyde weight, heat up to 50°C, and keep warm for reaction 30min, adjust the pH value of the reaction solution to 8-8.5, add urea with 25% formaldehyde weight, add melamine with 1% formaldehyde weight, heat up to 90-95°C, keep warm for 90min, check after the reaction, if formaldehyde is still contained, Add appropriate amount of urea or melamine to continue the reaction until the detected formaldehyde content is less than 5 mg / L, and add alkali to adjust the pH value of the reaction end solution to 7.2-7.5.

[0013] Manually select eucalyptus veneers of the same size, apply the above-mentioned adhesive, the amount of glue applied is 250g / ㎡, and the billets are assembled in 3 layers. Hot pressing, the temperature is 120°C, and the pressure is 1.5MPa; 4-6 hours of standing in a ...

Embodiment 2

[0015] Manually select eucalyptus veneers of the same size, apply the adhesive of Example 1, the glue amount is 280g / ㎡, form a blank (7 layers), cold press for the first time, the temperature is normal temperature, and the pressure is 0.9MPa , the first hot pressing, the temperature is 120-125°C, and the pressure is 1.8MPa; 80-90°C constant temperature room for 4-6 hours, the constant temperature room is ventilated and naturally cooled, heat dissipation and health care for 3-4 hours; the second cold pressing , the temperature is normal temperature, the pressure is 1.0MPa, the second hot pressing, the temperature is 115-120°C, and the pressure is 1.8MPa; the second time is to keep in a constant temperature room, the temperature is 80-90°C, and the time is 90-120min , the constant temperature room is ventilated to cool down naturally, heat dissipation and health preservation for 3-4 hours; the third cold pressing is at room temperature and the pressure is 1.0MPa, the third hot pr...

Embodiment 3

[0017] Manually select eucalyptus veneers of the same size, apply the adhesive of Example 1, the glue amount is 300g / ㎡, form a blank (11 layers), the first cold pressing, the temperature is normal temperature, and the pressure is 1.0MPa , the first hot pressing, the temperature is 120-125°C, and the pressure is 1.6MPa; 80-90°C constant temperature room for 4-6 hours, the constant temperature room is ventilated to cool down naturally, heat dissipation and health care for 3-4 hours; the second cold pressing , the temperature is normal temperature, the pressure is 1.0MPa, the second hot pressing, the temperature is 115-120°C, and the pressure is 2.0MPa; the second time is to keep in a constant temperature room, the temperature is 80-90°C, and the time is 90-120min , the constant temperature room is ventilated to cool down naturally, heat dissipation and health preservation for 3-4 hours; the third cold pressing is at room temperature and the pressure is 1.0MPa, the third hot press...

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Abstract

The invention provides a production method for a damp-proof full-eucalyptus laminated wood veneer. The artificial board is formed by high-temperature pressing and pasting of a base material and melamine impregnated paper, wherein the base material is formed by bonding a plurality of layers of eucalyptus veneers through adhesives. The production method comprises the steps of veneer sorting, gluing, cold pressing, hot pressing, stacking maintenance and pasting of the melamine impregnated paper. The production method is characterized in that three times of cold pressing and hot pressing and two times of thermostatic chamber standing maintenance and cooling maintenance processes are adopted, the cold pressing is performed at the room temperature and under the pressure of 0.8-1.0MPa, the hot pressing is performed under the pressure of 1.5-2.0MPa, the first hot pressing is performed at the temperature of 120-125DEG C, the second hot pressing is performed at the temperature of 115-120DEG C, and the third hot pressing is performed at the temperature of 125-130DEG C; the thermostatic chamber standing maintenance is performed at the temperature of 80-90DEG C for 4-6h; the cooling maintenance is cooled to the room temperature from the temperature of a thermostatic chamber through natural ventilation for 3-4h.

Description

technical field [0001] The invention relates to a production method of an artificial board, in particular to a production method of a moisture-proof full eucalyptus wood laminated veneer. Background technique [0002] Eucalyptus is the general name of Eucalyptus plants of Myrtaceae Myrtaceae. Eucalyptus has strong adaptability, can grow in poor soil, and has fast growth rate and low maintenance cost, so the planting area is increasing year by year. Eucalyptus wood is red, shiny, no special smell, interlaced texture, dense structure, hard and heavy material, easy to bend. Eucalyptus trees with larger diameters are cut into veneers and used as core boards to produce plywood or laminated veneer lumber, while eucalyptus trees with small diameters, branches, or difficult to be peeled are processed into wood chips for papermaking or fiberboard production. Therefore, eucalyptus The comprehensive utilization rate can be increased to more than 90%. In recent years, my country has s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27D3/00
Inventor 肖文飞王飞虎谢振能邓梅芳朱忠华李同雨
Owner 莫明鑫
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