Method for making environment-friendly type composite vegetation high and medium density fiber board

A technology of density fiberboard and manufacturing method, which is applied in the directions of fiberboard, papermaking, textiles and papermaking to achieve the effects of expanding raw material sources, reducing production costs and protecting the environment

Inactive Publication Date: 2005-01-26
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If wheat straw or rice straw is used as raw material to manufacture medium and high density fiberboards, it involves fiber manufacturing process issues.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Process straw stalks into fiber units with a length of 50mm, crush them into 20mm fragments, send them into a horizontal screw feeder, and feed 3kg of low-pressure steam inside, and use a special grinding disc for rice straw in a heat mill at 140°C with a pressure of 0.3Mpa Refining, separating fibers, applying E2 grade urea-formaldehyde resin glue, sizing amount is 12%, drying to obtain straw sizing fiber; adopting wood pulping, separating fibers, applying E2 grade urea-formaldehyde resin glue, sizing amount is 12% , dry to get wood sizing fiber, straw sizing fiber and wood sizing fiber are mixed in proportion, and the weight ratio is 6: 4; the sizing fiber after mixing is put into the dry silo, paving and forming, hot pressing, cutting Edge, cooling and sanding are made of medium density fiberboard; pass the medium density fiberboard through a hollow and airtight formaldehyde-reducing treatment chamber at a speed of 24m / min, and use the medium density fiberboard to sep...

Embodiment 2

[0023] The straw is processed into a fiber unit with a length of 20mm, crushed into 10mm pieces, and sent to a horizontal screw feeder, and the softener sodium sulfite is applied inside, and the rice straw special grinding disc is used in the heat mill at 120°C with a 0.2Mpa pressure mill Slurry, separate fiber, apply E2 grade urea-formaldehyde resin glue, sizing amount is 10%, dry, get straw sizing fiber; Adopt wood refining, separate fiber, apply E2 grade urea-formaldehyde resin glue, sizing amount is 10%, Drying to obtain wood sizing fibers, wood sizing fibers and straw sizing fibers are mixed in proportion, and the weight ratio is 2:8; the mixed sizing fibers are put into the dry silo, paved and formed, hot pressed, edge trimmed , cooling and sanding to make medium-density fiberboard plain board; pass the medium-density fiberboard plain board through a hollow airtight aldehyde-reducing treatment chamber at a speed of 3m / min, and utilize the medium-density fiberboard plain b...

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Abstract

This invention discloses one environmental protection vegetation compound high school density fiberboard manufacture method. This method use straw stalk processing smashing,grinding paste, defibering, exerts urea resin rubber,preparation straw stalk executes the rubber textile fiber;then uses lumber grinding paste,defibering, exerts the urea resin rubber, preparation lumber executes rubber textile fiber, executes lumber rubber textile fiber and straw stalk executes rubber textile fiber according to the proportion mix; Executes rubber textile fiber paving to take shape, the thermo-compression becomes the high school density cellulose board; Is spatial airtight the element board through the center falls the aldehyde processing room, this processing room separated in two parts; falls aldehyde processing room to pass over the ammonia, causes the element board two sides to have the pressure difference, ammonia penetrates element board under the pressure difference function, the adjustment falls aldehyde processing room controlled variable, may prepare the E1/E0 level environmental protection high and middle density fiberboard through the physical chemistry function. This invention reduced lumber consumption, protected the environment, and reduced the production cost, this product formaldehyde content has been low, guarantee product environmental protection target.

Description

technical field [0001] The invention belongs to the technical field of wood-based panels and composite materials, and relates to a method for manufacturing an environment-friendly grass-wood composite high- and high-density fiberboard. Background technique [0002] my country lacks forest resources and the supply of timber is tight. Especially after the national implementation of the natural forest protection project, timber logging is banned in 18 provinces, municipalities and autonomous regions across the country. Many wood-based panel companies are facing the threat of stopping production and changing production due to the shortage of raw materials, and urgently need to find alternative raw materials. On the other hand, my country is rich in crop straw resources, and the annual production of wheat straw and rice straw is as high as 400 million tons. A large amount of agricultural straw has not been rationally utilized for a long time. Except for a very small amount as live...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/16D21J1/00
Inventor 周定国梅长彤徐咏兰徐信武周晓燕张洋
Owner NANJING FORESTRY UNIV
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