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Making process of E1/E0 level green artificial plate

A manufacturing process and technology for wood-based panels, applied in the field of manufacturing process of E1/E0 environmental-friendly wood-based panels, can solve the problems of reduced mechanical properties of the panels, prolonged glue curing time, shortened storage period of adhesives, etc., and achieves obvious effects and high quality technology The effect of stable indicators and low processing costs

Inactive Publication Date: 2008-01-16
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

[0045] Medium-density fiberboard made of ordinary urea-formaldehyde resin glue, thickness 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 chamber at 24m / min, the length of the aldehyde reduction treatment chamber is 3m, the temperature is 50℃, the 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 liquid ammonia consumption is 9.0kg / m 3 At this time, the formaldehyde emission after treatment dropped to 5.4mg / 100g.

Embodiment 2

[0047] Medium-density fiberboard made of ordinary urea-formaldehyde resin glue, with a thickness of 18mm. Density 0.75g / cm 3 , The initial formaldehyde emission (perforation value) is 28mg / 100g, the medium-density fiber sheet passes through the aldehyde-reducing treatment chamber at 10m / min, the length of the aldehyde-reducing treatment chamber is 3m, the temperature is 50℃, 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 liquid ammonia consumption is 7.5kg / m 3 At this time, the formaldehyde emission after treatment dropped to 6.3mg / 100g.

Embodiment 3

[0049]Medium-density fiber sheet made of common urea-formaldehyde resin glue, thickness 15mm. Density 0.6g / cm 3 , The initial formaldehyde emission (perforation value) is 17mg / 100g, the medium-density fiber sheet passes through the aldehyde-reducing treatment chamber at 20m / min, the length of the aldehyde-reducing treatment chamber is 3m, the temperature is 70℃, 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 liquid ammonia consumption is 3.0kg / m 3 At the same time, the formaldehyde emission after treatment dropped to 7.6mg / 100g.

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PUM

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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 a wood-based panel, in particular to a manufacturing process of an E1 / E0-level environmentally-friendly wood-based panel. 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 current national standards stipulate that the free formaldehyde content (perforation method value) in the board is less than 9mg / 100g as E1 level, and if it is greater than 9mg / 100g and less than 30mg / 100g, it is E2 level. Recently, some people in the world have also proposed that the free formaldehyde content of the board is less than 5mg / 100g as E0 level. Relevant national departments require that the wood-based panels used for interior decoration must reach E1 level, or the original E2 level a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/00B27D1/04B27K7/00
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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