Method for manufacturing flash evaporation defibricating glue-free light corps stalk fibrous composite material

A fiber composite material and crop straw technology, which is applied in the direction of manufacturing tools, pretreatment of molding materials, flat products, etc., can solve problems such as large waste water and product limitations, and achieve the effects of reducing production costs, simplifying the production process, and ensuring strength

Inactive Publication Date: 2008-08-06
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this process will generate a large amount of waste water during the production process, and the products are limited to high-density thin plates, this production process has been basically eliminated at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Compacted density of 0.5g / cm3, thickness of 8mm non-glue cotton stalk light fiber composite material: take cotton stalk as raw material, process it into a unit with a length of 30mm, and control the moisture content at 50%. Put the cotton stalk unit into the steam explosion processor, and pass the saturated steam of 0.6MPa to treat it for about 8 minutes, then increase the saturated steam pressure to 1.5MPa and then treat it for 5 minutes. The pressure is released suddenly and the cotton stalks are dissociated into fibers. After drying to a moisture content of about 15%, it is spread and formed, and then pre-compressed and then sent to a spray steaming hot press. The injection steam pressure is 0.6MPa, the injection steaming time is 30s, the hot pressing temperature is 190℃, and the hot pressing time is 4min.

Embodiment 2

[0013] The pressing density is 0.3g / cm 3 , 30mm thick non-glue cotton stalk light fiber composite material: take cotton stalk as raw material, process it into a unit with a length of 20mm, and control the moisture content at about 55%. Put the cotton stalk unit into the steam explosion processor, and pass the saturated steam of 1.0 MPa for 5 minutes, then increase the saturated steam pressure to 1.9 MPa and then treat it for 2 minutes. The pressure is released suddenly and the cotton stalks are dissociated into fibers. After drying to a moisture content of about 25%, it is pavement shaped, pre-pressed and then sent to a spray steaming hot press. The injection steam pressure is 1.0MPa, the injection steaming time is 10s, the hot pressing temperature is 180°C, and the hot pressing time is 15min.

Embodiment 3

[0015] The pressing density is 0.4g / cm 3 , The thickness of 20mm non-glue cotton stalk light fiber composite material: take cotton stalk as raw material, process it into a unit with a length of 25mm, and control the moisture content at about 60%. Put the cotton stalk unit into the steam explosion processor, pass 0.8MPa saturated steam for treatment for about 7 minutes, then increase the saturated steam pressure to 1.7MPa and then treat for 3 minutes, suddenly release the pressure to discharge, the cotton stalks are dissociated into fibers. After being dried to a moisture content of about 20%, it is spread and formed, and then sent to a spray steaming hot press after pre-pressing. The injection steam pressure is 0.8MPa, the injection steaming time is 20s, the hot pressing temperature is 180°C, and the hot pressing time is 10min.

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Abstract

The invention discloses a method for manufacturing a flashing defibrillator non-gel light crop straw fiber composite material, the technique of which is that: the straw material is crashed into units with a length of 20-30mm and a water ratio of 50-60 percent; the straw units are placed in a steam explosion processor, then are stewed by high-temperature high-pressure saturated steam led into the processor, and a valve is instantaneously opened to release the pressure and discharge material; two-part form steam exploded processing technique is adopted, namely, the straw units are pretreated under a relatively low steam tension for 5-8 minutes, then are treated under a relatively high steam tension for 2-5 minutes, and the valve is opened abruptly to release the pressure and discharge material, in order to obtain a dissociative fiber; slabs are molded; an enclosed steam injection pressing technique is adopted, with a vapor pressure of 0.6-1.0MPa, and steam-injection time of 10-30 seconds; after the steam injection, the periphery of the slab is enclosed, with a hot-pressing temperature of 180-190 DEG C and hot-pressing time of 4-15 minutes. The method for manufacturing flashing defibrillator non-gel light crop straw fiber composite material has the advantages that in the whole processes of product manufacturing and employment, no environmental pollution is caused; an emulsion sizing procedure is saved; the production cost is lowered; different width of light sheet are manufactured.

Description

Technical field [0001] The invention relates to a method for manufacturing a flash-defibrating and glue-free lightweight crop straw fiber composite material. The crop straw is used as a raw material and undergoes the processes of crushing, flash-defibrating, drying, paving, pre-pressing, closed spraying and hot pressing. A method for manufacturing lightweight crop straw fiber composite materials without adhesives and any activators or catalysts. It belongs to the technical field of plant fiber composite materials. Background technique [0002] Due to the glue-making and board-making process and the environmental conditions of the board use, the man-made board made of urea-formaldehyde glue has the problem of free formaldehyde release, and it is long-term, stubborn and repeatable. There are only two ways to essentially solve the technical problem of free formaldehyde release from wood-based panels: one is to use formaldehyde-free adhesives (such as isocyanate adhesives, protein gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/04B27N1/00B27N3/08B27N3/10
Inventor 周晓燕何翠芳周定国徐咏兰梅长彤崔举庆连海兰徐信武
Owner NANJING FORESTRY UNIV
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