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large surface specific resistance of polyester-cottonpolyester dty yarn fabrics, it is difficult to dissipate the static charges on the surface caused by the brushing, which brings great difficulties to the subsequent processing. Especially in dyeing or printing, when the short fibers adsorbed by static electricity on the surface pass through the dye solution or slurry, due to the static electricity of the liquid, the short fibers on the cloth surface will partly fall into the dye solution and stick to the printed flower net. , Causing short fibers to stain the cloth surface again with the dye solution to form color spots. There are some parts that have not fallen into the dye solution or are not stained with the flower net, but remain on the cloth surface. When the short fibers are washed off by the dyeing or printing washing water, white spots will be exposed. For this reason, many domestic printing and dyeing factories use antistatic surfactants that are not washable before sanding to reduce the static electricity of the fabric after sanding. It is hoped that the short fibers that are electrostatically adsorbed on the cloth surface can be washed clean when washing. Doing so requires multiple washings, increasing production costs and reducing labor efficiency, but the effect is generally unsatisfactory, and it is difficult to prevent the short fibers from being contaminated again during drying.
After theoretical analysis and many times of practice, it is believed that no antistatic agent should be added before sanding, and 5~10g/L sodium chloride or lithium chloride should be added to the hot-air stenter after sanding and washing. (Lithium chloride is more expensive, but the effect is It is better than sodium chloride, and sodium chloride is generally used in production), which reduces the surface resistance and moisture absorption rate of the fabric, so that the electrical conductivity of the fabric is greatly improved, thereby preventing the fabric from reversing the short fibers. Since sodium chloride will not cause unnecessary troubles to subsequent processing (dyeing or printing), and the hydration effect is excellent, the antistatic property of the polyester-cotton fabric treated by the above method is greatly improved, and the dyeing and printing are no longer required. Worry about yarn and wool, white spots and other issues. When the polyester content in the fabric is higher than 55%, it is best to add 2~3g/L urea to enhance the moisture absorption and conductivity of the fabric surface and reduce the accumulation of charge.
This method is also suitable for the antistatic treatment before dyeing of polyester-cotton and CVC fabrics without sanding.