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Hemp-like bast fibre flash explosion-high temperature boiling combination degumming technique

A technology of bast fiber and process method, which is applied in the directions of fiber treatment, chemical post-treatment of fibers, textiles and papermaking, etc., can solve the problems of difficulty in large-scale promotion of biological degumming, low enzyme activity, and lack of ligninase. Satisfy safety and ease of operation, improved spinnability, and complete removal of pectin and lignin

Inactive Publication Date: 2008-03-26
THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the current point of view, single biological degumming cannot be used in industrial production, mainly because the enzyme activity of enzyme-producing bacteria or enzyme preparations is too low, and the raw hemp after enzyme degumming also contains too much gum. So far, no suitable ligninase has been found, so it is difficult to promote large-scale biological degumming

Method used

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  • Hemp-like bast fibre flash explosion-high temperature boiling combination degumming technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] a. Prepreg treatment

[0048] The hemp husk is soaked in a sulfuric acid solution, the sulfuric acid concentration is 0.05% (o.w.f), the time is 0.1-2h, and the temperature is 20°C. After pretreatment, by extrusion, the liquid rate of hemp belt is controlled at 20%;

[0049] b. flash explosion

[0050] Put the above-mentioned pre-soaked hemp husk into a flash explosion device consisting of three parts: a steam generator, a flash explosion device and a receiver, pass in hot steam to pressurize to 0.5Mpa, and then keep the pressure in the flash explosion device box For 10 minutes, the momentary release of pressure through the relief valve exploded into the receiver box, partially degumming and splitting the fibers.

[0051] c. High temperature cooking

[0052] After the flash-exploded hemp husk is washed, it is steamed at high temperature to further remove impurities on the fiber. The high-temperature cooking treatment adopts the lye cooking method, the high-temperatu...

Embodiment 2

[0054] a. Prepreg treatment

[0055] Soak ramie hemp skin in sulfuric acid solution, the concentration of sulfuric acid is 0.2% (o.w.f), the time is 2h, and the temperature is 50°C. After the pretreatment, the liquid rate of the ramie belt is controlled at 100% by drying;

[0056] b. flash explosion

[0057] Put the above-mentioned pre-soaked ramie husks into a flash explosion device consisting of three parts: a steam generator, a flash explosion device and a receiver, pass in hot steam to pressurize to 2.0Mpa, and then maintain the pressure in the flash explosion device box 90 minutes, momentary release of pressure through the relief valve to blast into the receiver box, partially degumming and splitting the fibers.

[0058] c. High temperature cooking

[0059] After the flash-exploded hemp husk is washed, it is steamed at high temperature to further remove impurities on the fiber. The high-temperature cooking process adopts the lye cooking method, the high-temperature co...

Embodiment 3

[0061] a. Prepreg treatment

[0062] Soak the hemp husk in NaOH solution, the NaOH concentration is 0.1% (o.w.f), the time is 0.2h, and the temperature is 20°C. After pretreatment, by drying, the liquid rate of hemp belt is controlled at 50%;

[0063] b. flash explosion

[0064] Put the above-mentioned pre-soaked hemp husk into a flash explosion device consisting of three parts: a steam generator, a flash explosion device and a receiver, pressurize it to 2.0Mpa with hot steam, and then keep the pressure in the flash explosion device box 90 minutes, momentary release of pressure through the relief valve to blast into the receiver box, partially degumming and splitting the fibers.

[0065] c. High temperature cooking

[0066] After the flash-exploded hemp husk is washed, it is steamed at high temperature to further remove impurities on the fiber. The high-temperature cooking treatment adopts the lye cooking method, the high-temperature cooking temperature is 180°C, the treat...

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Abstract

The flash bursting and high temperature digesting process for degumming hemp bast fiber includes pre-treatment, flash bursting and high temperature digesting to eliminate residual pectin, hemicellulose and lignin from hemp bast fiber, and raise the fiber fracturing degree and softness. The flash bursting and high temperature digesting process has ideal degumming effect, obvious non-fiber component eliminating effect and less pollution, and the degummed hemp bast fiber has high cellulose rate, high fiber fracturing degree and high fiber flexibility.

Description

technical field [0001] The invention relates to a combined degumming process of hemp bast fibers by flash explosion and high-temperature cooking. In this method, the hemp bast fibers are pretreated, then flash-exploded, and then subjected to high-temperature cooking and degumming treatment. The purpose is to remove the hemp fibers Residual pectin, hemicellulose and lignin on the surface, improve fiber splitting and softness. . Background technique [0002] The main components of hemp bast fiber are pectin, hemicellulose, cellulose and lignin. [0003] Pectin is a nutrient substance for plants to produce cellulose, hemicellulose and other components. It is composed of a mixed chain containing uronic acid rings. It is a kind of acidic mixed sugar. The main component is pectic acid. ) and its derivatives, as well as many other polysaccharides symbiotic with it. Pectin mainly exists in the intercellular layer, which is the bonding substance between cells; at the same time, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/00
Inventor 张建春郝新敏张华
Owner THE QUARTERMASTER EQUIPMENT RESEARCH INSTITUTE OF THE GENERAL LOGISITIC DEPARTME
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