Preparation process of formaldehyde-free plywood

A preparation process and technology for plywood, applied in the field of plywood manufacturing, can solve the problems of easy cracking of plywood, uneven bonding strength, poor quality of the board, etc., and achieve the effects of stable pressure, sufficient and uniform pressure, and good stability.

Active Publication Date: 2021-06-08
广西协力合板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the improvement of people's living standards, people's awareness of health and environmental protection is becoming stronger and stronger, and the desire for formaldehyde-free decorative materials in interior decoration is also more urgent. At present, the decorative panels on the market are mainly E1 and E0 grades. Mainly, it has been unable to meet people's needs for high-quality life, and the appearance of formaldehyde-free plywood provides protection for people's health
However, based on the formaldehyde-free plywood, especially when water-based polyurethane is used as the adhesive, the quality of the board obtained by using the traditional processing technology is poor, mainly reflected in defects such as uneven bonding strength, easy cracking and deformation of the plywood, and poor stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0031] Formaldehyde-free plywood preparation process, its process steps include:

[0032] (1) Single board manufacturing

[0033] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the veneer atomization and water addition step; the veneer atomization and water addition step is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 19-20%.

[0034] (2) Compounding

[0035] The water-based polyurethane mixture is prepared by mixing the water-based polyurethane and the curing agent at a ratio of 8:1. Of course, this embodiment can also be obtained by mixing the water-based polyurethane and the curing agent at a ratio of 9:1.5. ...

specific Embodiment 2

[0058] Formaldehyde-free plywood preparation process, its process steps include:

[0059] (1) Single board manufacturing

[0060] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the veneer atomization and water addition step; the veneer atomization and water addition step is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 18-22%.

[0061] (2) Compounding

[0062] Prepare water-based polyurethane mixture by mixing water-based polyurethane and curing agent in a ratio of 8:2.

[0063] (3) Glue sizing and forming

[0064] Double-sided sizing is carried out on the veneer that needs sizing, and the total amount of double-s...

specific Embodiment 3

[0085] Formaldehyde-free plywood preparation process, its process steps include:

[0086] (1) Single board manufacturing

[0087] The processing requires the surface of the veneer to be smooth, without large burrs, basically without dead joints, and uniform in thickness; the veneer is assembled into a 4x8 feet format by a veneer. Then enter the step of veneer atomization and water addition; the step of veneer atomization and water addition is to spread the veneer on the conveyor belt, atomize the water and spray the veneer, and adjust the amount of spraying or the speed of the conveyor belt to ensure After standing still, the moisture content inside and outside of the veneer is between 20-22%.

[0088] (three) with glue

[0089] Prepare water-based polyurethane mixture by mixing water-based polyurethane and curing agent at a ratio of 9:1. Of course, this embodiment can also be obtained by mixing water-based polyurethane and curing agent at a ratio of 9:2, and the effect is b...

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PUM

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Abstract

The invention discloses a preparation process of formaldehyde-free plywood, including veneer manufacturing, glue mixing, sizing, billet formation, cold pressing, and post-processing. After the cold pressing process, a hot pressing process is required. In the sizing process, the water-based polyurethane mixture is used as the adhesive. The invention is suitable for using the water-based polyurethane, and realizes the preparation process of the plywood plywood with good bonding strength, uniform thickness of the slab, not easily deformed, and good stability.

Description

technical field [0001] The invention relates to the technical field of plywood manufacture, in particular to a preparation process of formaldehyde-free plywood. Background technique [0002] The adhesives currently used in plywood production mainly include urea-formaldehyde resin adhesives, 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 released formaldehyde is harmful to the human body. With the improvement of people's living standards, people's awareness of health and environmental protection is becoming stronger and stronger, and the desire for formaldehyde-free decorative materials in interior decoration is also more urgent. At present, the decorative panels on the market are mainly E1 and E0 grades. Mainly, it has been unable to meet people's needs for high-quality life, and the appearance of formaldehyde-free plywood provides protection fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/12B27D1/04B27D1/08B27G11/00C09J175/04
CPCB27D1/04B27D1/08B27G11/00C09J175/04
Inventor 黄文煜宋磊
Owner 广西协力合板有限公司
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