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Method for producing glue-free fiber board by using dry method of steam explosion slurry

A fiberboard and pulp technology, which is applied in the field of high-density glue-free fiberboard, can solve the problems of complicated preparation process, high corrosion of equipment, increase production cost, etc. Effect

Inactive Publication Date: 2011-10-26
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only cumbersome to prepare, but also highly corrosive to the equipment, thus greatly increasing the production cost

Method used

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  • Method for producing glue-free fiber board by using dry method of steam explosion slurry
  • Method for producing glue-free fiber board by using dry method of steam explosion slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Dry the bamboo chips to a moisture content of 3mm to ≤ 3mm, then mix it with the fine material separated from the original, and air-dry it together until the moisture content is 12%, and then press the middle The conventional process of MDF production is paved and hot-pressed. The hot-pressing temperature is 160 ° C. The hot-pressing pressure in the hydrolysis section and the plasticizing section is 4.0 MPa, and the hot-pressing pressure in the exhaust section is 1.5 MPa. The hot-pressing time in the hydrolysis section is 4 minutes. The hot pressing time of the exhaust section is 0.5min, and the hot pressing time of the plasticizing section is 3.5min. Finally, post-processing is performed on the pressed glue-free bamboo fiber board.

Embodiment 2-18

[0024] The rest of Examples 2-18 can be carried out with reference to the method of Example 1, wherein the gramineous plant raw materials, according to the different forms of the raw materials, are differently truncated or sliced, dried naturally, with a moisture content of <10%, and steamed The water vapor injected into the tank is pressurized at 1.2-1.6MPa, the pressure holding time is 6-12 minutes, and then the pressure is raised to 1.6-1.8MPa. When hot pressing on the press, the pressure value and control are divided into three stages. For the value of heat pressing time, just refer to the values ​​listed in the table, and will not list them one by one.

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Abstract

The invention discloses a method for producing a glue-free fiber board by using a dry method of steam explosion slurry, and relates to a method for producing a glue-free fiber board by using a dry method of slurry prepared by gramineous plant fiber steam explosion. The method comprises the following seven steps of: 1, preparing raw materials; 2, preparing the steam explosion slurry; 3, separating, accurately grinding and mixing; 4, drying the slurry; 5, paving; 6, performing hot pressing in high-water low-temperature and low-water high-temperature modes; and 7, performing post treatment. The glue-free fiber board prepared by the method has no free formaldehyde or phenol and does not harm the environment; the raw materials do not need to be treated by catalysts of acid, alkali and the like, so acid and alkali pollution and equipment corrosion are not caused; and the water-soluble resin in the steam explosion slurry is not separated or concentrated, and the separated residues are not subjected to secondary steam explosion, so the process is not required, the energy is saved, and the production efficiency is high. The manufactured glue-free fiber board has high strength and low cost.

Description

technical field [0001] The invention relates to a method for producing medium and high-density glue-free fiberboards by dry method using gramineous plants as raw materials and steam-exploding them into slurry. Background technique [0002] CN 85105958 announces the method for producing synthetics with fiber lignin raw material, its fiber lignin raw material is processed with acidic catalyst before high-pressure steam treatment, impels hemicellulose to degrade and forms substances such as furfural, and this method is corrosive to equipment Big. CN1041744C announces the method for producing thermosetting resin and composite material products by lignocellulose, the lignocellulose raw material is mixed with the acidic catalyst that consumption is no more than 5% (weight), after high-pressure steam treatment, a part of water-soluble resin material It is separated and concentrated to make a thermosetting resin for use as an adhesive. The residue is treated with high-pressure stea...

Claims

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Application Information

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IPC IPC(8): B27N3/12D21B1/36
Inventor 金贞福童再康
Owner ZHEJIANG FORESTRY UNIVERSITY
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