Flax fiber degumming method

Abstract

The invention provides a flax fiber degumming method. The method comprises the following steps: (1) pickling by using sulfuric acid; (2) degumming by using pectinase and xylanase, wherein the pectinase accounts for 1-2% of the flax fiber in mass fraction, and the xylanase accounts for 0.5-2% of the flax fiber in mass fraction; (3) extracting by using caustic soda and calcined soda; (4) bleaching by using hydrogen peroxide. According to the flax fiber degumming method provided by the invention, the pectinase and the xylanase which are free of damage to the flax fiber, free of pollution to the environment and strong in specificity are adopted for sufficiently degumming the flax fiber, so that the division index of the flax fiber can be effectively increased, the uniformity of the flax fiber can be effectively improved; then, commensals of the flax fiber are sufficiently removed through extracting and bleaching, so that the spinning count is increased, the spinning quality is improved, the production cost is reduced, the production difficulty is lowered, and meanwhile, the pollutant discharge is reduced.

Description

technical field [0001] The invention belongs to the field of processing textile raw materials, and in particular relates to a flax fiber degumming method. Background technique [0002] In the traditional process, the symbionts that must be removed from the flax fiber are treated by using a large amount of alkali and sodium chlorite in the process of scouring and sub-bleaching, which not only produces a large amount of sewage, but also damages the fiber to a certain extent, which leads to Key factor in contamination and poor spinning quality. [0003] At present, pure linen yarn is mainly spun by wet spinning process in China, and degummed by roving bleaching before wet spinning. The commonly used degumming process is as follows (the content of each substance mentioned is the content of the substance relative to flax fiber. mass fraction): (1) Pickling (H 2 SO 4 , 3%-5%); (2) scouring (caustic soda 5% + soda ash 15%); (3) sodium chlorite bleaching (2.5%-4%); (4) oxygen ble...

AI Technical Summary

Problems solved by technology

This process has high requirements on spinning equipment, and special equipment for hemp spinning and water spinning with high cost and low popularity must be used, resulting in high production cost and difficulty, and serious pollution due to the large use of alkali and sodium chlorite

[0004] For flax blended yarns (such as flax / cotton, flax / viscose, etc.), the dry spinning process is usually used for spinning. Since the flax fibers are not degummed before dry spinning, only about 10 and 10 can be produced. The following coarse yarns are mainly used, but cannot be spun into 20 or more yarns with a flax content of about 50% for knitting and weaving, and it is impossible to avoid using a large amount of yarn in the subsequent dyeing and finishing process. Soda scouring and sodium hypochlorite bleaching to remove commensals from the flax fiber, so there is still a big pollution problem

[0005] In the prior art, there is also a method of treating flax fiber with pectinase to remove pectin, but the symbiosis in flax fiber is accompanied by the growth process of flax fiber, and they are in a mixed state with each other , due to the specificity of biological enzymes, pectinase treatment can only remove part of the pectin in the symbiosis, and there is still residual pectin that cannot be removed, and the degumming effect is poor

In addition, also due to the specificity of biological enzymes, pectinase has no effect on the removal of other components in the symbiosis, so the flax fiber treated only by pectinase degumming cannot meet the production requirements

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