Processing method for cotton/hemp blended knitted fabric

Abstract

The invention discloses a processing method of cotton / ramie blended knitting fabric which adopts processing equipment of a cotton mill and adds yarn boiling and demineralizing processes before a weaving process. The whole technological process is from yarn boiling, demineralizing, weaving, mercerizing, bleaching and boiling, biological enzyme washing, and dyeing, softening, dehydration, width opening, drying and setting to preshrinking. The yarn boiling temperature in the yarn boiling process is 80 to 130 DEG C and the time is 10-30m. The demineralizing temperature in the demineralizing process is 30 to 90 DEG C and the time is 10-30m. In the demineralizing treatment, acid demineralizing agent and refining agent are used to remove heavy metal ions in cotton / ramie blended yarn. The invention has the advantages of ensuring the neat surface of the knitting fabric, comfort handle, light shrinkage and distortion and good durability with the added yarn boiling and demineralizing processes, eliminating the internal stress of the cotton / ramie blended yarn through the yarn boiling process, improving the toughness and the weaving efficiency of the knitting fabric, improving the insurance coefficient of the boiling and bleaching process through the demineralizing process and providing a guarantee for the strength of the knitting fabric.

Description

technical field [0001] The invention relates to a processing method of a knitted fabric, in particular to a processing method of a cotton / linen blended knitted fabric. Background technique [0002] Cotton / linen blended knitted fabrics, especially cotton / hemp blended knitted fabrics, are very popular in the market due to their smooth handle, breathable crispness, and comfortable wearing. However, due to the hemp fiber itself has more impurities, high rigidity and poor flexibility, and the whiteness and strength of the cotton / hemp blended yarn are also poor, and there are many knots, the cotton / hemp blended knitted fabric has poor whiteness and hairiness. There are many knots and knots, and it is easy to produce holes, which brings certain difficulties to dyeing and finishing; moreover, this type of knitted fabric is prone to deformation, shrinkage and distortion to a large extent during the washing process, and its shape retention is poor. Poor, seriously affecting the quali...

AI Technical Summary

Problems solved by technology

[0006] Most of the processing methods used by domestic manufacturers are to improve the whiteness and appearance of the base by improving the bleaching process and combining the bio-polishing process; some also use mercerizing to further improve the hairiness, knots and dimensional stability of knitted fabrics. The method of combining biological enzyme washing and mercerizing to improve the surface effect of cotton / hemp knitted fabrics is as follows: weaving→mercerizing→boiling and bleaching→biological enzyme washing→dyeing→oversoftening→dehydration→opening→drying →Sizing→Pre-shrinking, but when the cotton / hemp knitted fabric is mercerized, the pectin is destroyed due to the action of concentrated alkali, which reduces the cohesion of the bundle fibers, resulting in a decrease in the strength of the knitted fabric; and then through biological (cellulase) After enzyme washing and finishing, although the surface smoothness, hand feeling, drapability and wool effect of knitted fabrics are improved, the hydrolysis of the fiber end molecules weakens the intermolecular force of the fibers and causes a loss of strength. The higher the concentration of cellulase, the lower the strength The more obvious, it is easy to produce holes, and when the concentration is too low, it will not achieve good results, especially when processing some dark-colored products, the dyeing and soaping time will be longer, and the knitted fabric will undergo a long period of mechanical treatment in the tank. After stretching and friction, the effect of removing hairiness in the finished knitted fabric is poor; in addition, the setting in this process cannot pass through the resin, but the resin will cause shrinkage and twisting to fail to meet the standard, which will cause the knitted fabric to lose its shape. The finished product has poor hand feel and durability of cloth surface quality. After repeated washing, it is easy to pilling, dimensional deformation and other problems.