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Production technology of environment-friendly medium-density fiberboard

A production process and medium density technology, which is applied in the pretreatment of molding materials, manufacturing tools, adhesive types, etc., can solve the problem that the formaldehyde emission of the finished board does not meet the standard requirements, the difficulty of controlling the formaldehyde emission of the finished board increases, The addition ratio is difficult to achieve stability and other problems, so as to improve the heat transfer performance of the plate, reduce the release of free formaldehyde, and improve the density.

Active Publication Date: 2012-11-28
广西高峰五洲人造板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The production process of traditional fiberboards has the following defects: ① Due to the use of traditional adhesives, the formaldehyde emission of the finished boards does not meet the standard requirements, and ammonia treatment is required to meet the product requirements, and the amino acid residues in the finished boards cause environmental pollution; Adding additives in the grinding section will change the index ratio of the adhesive. At the same time, it is difficult to achieve a stable addition ratio, the stability of the adhesive will change, and the difficulty in controlling the formaldehyde emission of the finished board will increase.

Method used

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  • Production technology of environment-friendly medium-density fiberboard
  • Production technology of environment-friendly medium-density fiberboard
  • Production technology of environment-friendly medium-density fiberboard

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Select the site for storing raw materials, control the moisture content of the selected raw materials at 40% to 60%, and classify and store the woody raw materials respectively.

[0029] (2) Chip various woody raw materials (such as small-diameter wood, wood processing residues, etc.) with a chipper. The wood chips are required to have a smooth cut and uniform size. 3~5mm. For purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0030] (3) Screen the flake raw materials, remove overly large wood chips and too small debris, and detect, adsorb and remove the possible iron metals in the raw materials.

[0031] (4) Evenly mix flake raw materials with different degrees of dryness and wetness, and then enter the steam buffer silo with a pressure of 0.6MPa and a temperature of 155°C after being treated by an oil-cooled electromagnetic separator for cooking and softening...

Embodiment 2

[0043] (1) Select the site for storing raw materials, control the moisture content of the selected raw materials at 40% to 60%, and classify and store the woody raw materials respectively.

[0044] (2) Chip various woody raw materials (such as small-diameter wood, wood processing residues, etc.) with a chipper. The wood chips are required to have a smooth cut and uniform size. 3~5mm. For purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0045] (3) Screen the flake raw materials, remove overly large wood chips and too small debris, and detect, adsorb and remove the possible iron metals in the raw materials.

[0046] (4) Evenly mix flake raw materials with different degrees of dryness and humidity, and then enter the steam buffer silo with a pressure of 0.8MPa and a temperature of 160°C after being treated by an oil-cooled electromagnetic separator for cooking and softening....

Embodiment 3

[0058] (1) Select the site for storing raw materials, control the moisture content of the selected raw materials at 40% to 60%, and classify and store the woody raw materials respectively.

[0059] (2) Chip various woody raw materials (such as small-diameter wood, wood processing residues, etc.) with a chipper. The wood chips are required to have a smooth cut and uniform size. 3~5mm. For purchased wood chips, the quality inspection shall be carried out according to the above wood chip quality and raw material moisture content requirements.

[0060] (3) Screen the flake raw materials, remove overly large wood chips and too small debris, and detect, adsorb and remove the possible iron metals in the raw materials.

[0061] (4) Evenly mix flake raw materials with different degrees of dryness and wetness, and then enter the steam buffer silo with a pressure of 1.0MPa and a temperature of 170°C after being treated by an oil-cooled electromagnetic separator for cooking and softening...

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Abstract

The invention discloses a production technology of an environment-friendly medium-density fiberboard. The finished product is prepared by the steps of raw material chipping, proportioning, steaming, waxing, hot grinding, gluing, drying and winnowing, laying and forming, pre-pressing, final trimming, hot pressing, flap cooling, trimming and sanding, wherein the gluing step comprises a glue preparation technology, wherein formaldehyde and urea are used as main raw materials; the urea is added three times; and after urea is added each time, the molar ratio of the formaldehyde to the total quantity of urea is (2.4-3.0):1, (1.3-1.5):1 and (0.8-1.0):1, respectively. The glue preparation technology adopts a weak base-mediate strong acid-weak base reaction path, so that the raw materials sequentially react in three media with pH being 8.0-8.5, 2.5-3.5 and 8.0-8.5, respectively, and finally the urea resin adhesive level MDF_E1 is obtained. Through the production technology of the medium-density fiberboard, disclosed by the invention, an effect of reducing formaldehyde release amount can be reached without adding additives to the hot grinding technology or performing post-ammonia water treatment.

Description

technical field [0001] The invention relates to the technical field of fiberboard production technology, in particular to a production technology of environment-friendly medium density fiberboard. Background technique [0002] At present, most of the wood-based panels produced in my country use urea-formaldehyde resin, which is formed by mixing formaldehyde and urea in a certain molar ratio to form urea-formaldehyde resin. After the wood-based panels are produced, free formaldehyde remains in the panels, which is harmful to people's health. Formaldehyde release from wood-based panels mainly comes from: ① unreacted free formaldehyde in urea-formaldehyde resin; ② unstable molecules in resin release formaldehyde during hot pressing or board use; ③ hemicellulose in wood will also gradually decompose and release formaldehyde. [0003] The production process of traditional fiberboards has the following defects: ① Due to the use of traditional adhesives, the formaldehyde emission ...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N1/02B27N3/12C09J161/24C08G12/12
Inventor 梁杰培沈卫武朱胜碧陈东林英飞
Owner 广西高峰五洲人造板有限公司
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