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Making process of E1/E0 level green artificial plate

A manufacturing process and wood-based panel technology, which is applied in the manufacturing process of E1/E0 environmental-friendly wood-based panels, can solve the problems of reduced mechanical properties of the board, prolonged glue curing time, shortened storage period of adhesives, etc., achieving obvious effects and quality technology The effect of stable index and low processing cost

Inactive Publication Date: 2004-09-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to manufacture E1 grade wood-based panels, at present, many enterprises rely on the use of E1 grade urea-formaldehyde resin glue, but it will bring a series of negative effects, such as the increase in the cost of the adhesive, the glue curing time will be extended, the production capacity of the hot press machine will be reduced and the plate The mechanical properties will be reduced
In addition, the shelf life of the adhesive is shortened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A medium density fiber sheet made of ordinary urea-formaldehyde resin glue, with a thickness of 8mm. Density 0.8g / cm 3 , the initial formaldehyde emission (perforation value) is 18mg / 100g, the medium density fiber sheet passes through the aldehyde reduction treatment room at 24m / min, the length of the aldehyde reduction treatment room is 3m, the temperature is 50°C, ammonia gas is introduced, and the action time is 7.5 s, the pressure on one side of the wood-based panel is 1 atmosphere, the pressure on the other side is 750Pa, and the consumption of liquid ammonia is 9.0kg / m 3 , the amount of formaldehyde released after treatment dropped to 5.4mg / 100g.

Embodiment 2

[0040] Medium-density fiber sheet made of ordinary urea-formaldehyde resin glue, with a thickness of 18mm. Density 0.75g / cm 3 , the initial formaldehyde release (perforation value) is 28mg / 100g, the medium density fiber sheet passes through the aldehyde reduction treatment room at 10m / min, the length of the aldehyde reduction treatment room is 3m, the temperature is 50°C, ammonia gas is introduced, and the action time is 18s , the pressure on one side of the wood-based panel is 1 atmosphere, the pressure on the other side is 800Pa, and the consumption of liquid ammonia is 7.5kg / m 3 , the amount of formaldehyde released after treatment dropped to 6.3mg / 100g.

Embodiment 3

[0042] A medium density fiber sheet made of ordinary urea-formaldehyde resin glue, with a thickness of 15mm. Density 0.6g / cm 3 , the initial formaldehyde emission (perforation value) is 17mg / 100g, the medium density fiber sheet passes through the aldehyde reduction treatment room at 20m / min, the length of the aldehyde reduction treatment room is 3m, the temperature is 70°C, ammonia gas is introduced, and the action time is 9s , the pressure on one side of the wood-based panel is 1 atmosphere, the pressure on the other side is 700Pa, and the consumption of liquid ammonia is 3.0kg / m 3 , the amount of formaldehyde released after treatment dropped to 7.6mg / 100g.

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Abstract

The present invention discloses one kind of making process of E1 / E0 level environment protection artificial plate. After plain plate with free formaldehyde releasing amount greater than or equal to E2 level is made with common urea resin adhesive, the plain plate is processed through ammonia vacuum process to lower the free formaldehyde releasing amount to E1 / E0 level. According to the density and initial formaldehyde releasing amount of the plain plate, the ammonia consumption and formaldehyde lowering time are regulated to control the processing effect. The said process has stable product quality and low cost, and is suitable for various artificial plates, including plywood, medium density fiber plate, high density fiber plate and shaving board.

Description

technical field [0001] The invention relates to a manufacturing process of an artificial board, in particular to a manufacturing process of an E1 / E0 grade environment-friendly artificial board. Background technique [0002] At present, most of the wood-based panels produced in my country (including plywood, medium-density fiberboard (MDF), high-density fiberboard and particleboard) use urea-formaldehyde resin glue, and free formaldehyde will remain in the board after hot pressing. The relevant current national standards stipulate that the free formaldehyde content in the board (perforation method value) is less than 9mg / 100g is E1 grade, and the board is E2 grade if it is more than 9mg / 100g and less than 30mg / 100g. Recently, some people in the world have also proposed that the free formaldehyde content of the board is less than 5mg / 100g as E0 grade. Compulsory requirements of relevant state departments, wood-based panels used for interior decoration must reach E1 level, or ...

Claims

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Application Information

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IPC IPC(8): B27D1/04B27K7/00B27N3/00
Inventor 周定国梅长彤姜伟民叶敬言徐信武周晓燕徐咏兰刘竹华张洋
Owner NANJING FORESTRY UNIV
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