How to reasonably solve the problem of itching in the pre-treatment of pure ramie knitted fabrics?

Answer The itchy feeling of ramie fabric is determined by the properties of ramie fiber. Compared with cotton and wool fibers, ramie fiber has higher dry and wet strength (about 2 times that of cotton and 5 times that of wool). Its elongation at break is smaller, but its Young’s modulus is larger. The above characteristics determine Because of the high rigidity of ramie fiber, the fibers are hard and stiff. During the spinning and twisting process, the cohesion between fibers is poor and the fibers are loose, resulting in more hairiness in the spinning yarn. The hairiness of the fabric per unit area is much greater than that of cotton. The itch of fabrics refers to the feeling caused by the contact between hairiness and skin and mechanical action on the surface of the fabric. The greater the mechanical effects, the more severe the itch. The intensity of the itching sensation depends on the pressure at the contact point between the fiber ends and the skin. The greater the pressure, the greater the itching sensation, and vice versa. The itching sensation is also related to the length and cross-sectional area of the hairs. Through the above mechanism analysis, it is found that the cause of the itching sensation on the human body is the rough and numerous hairiness on the surface of the fabric. Therefore, solving the hairiness problem is the key to solving the itching sensation. At present, the itch and hand problems of ramie fabrics are often solved by methods such as cellulase treatment, chemical and mechanical finishing. Practice has proved that hairiness can be greatly reduced through singeing and silk finishing, which is beneficial to solving the itch. If treated with a softener and combined with mechanical action, the hair feathers can be changed from the original straight shape to a curled shape (Figure 2-3), so that the ends of the hair feathers cannot come into contact with the human body, thus reducing the itch. Purpose.

Softening process: fabric – softening treatment – water washing – pickling (neutralization) – mechanical friction
Process formula: softener 20~40g/L, temperature 40℃, time 20min. The water-to-bath ratio is 1:40, and the temperature is 40°C. Use HAc (98%) 1~2mL/L for acid neutralization. Mechanical friction is performed for 30 minutes in a tumble dryer. Softening treatment, water washing, and acid neutralization are all carried out in the Q113 rope coloring machine.
Perform softening treatment after softening treatment. Softening treatment prescription: Softener A-100 (silicon-containing softener) 5g/L, liquor ratio 1:15, 40°C for 10 minutes.

AAADBGRTHRTH

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