Surface dyeing method of cotton yarn for denim by low temperature dip-dyeling, cotton yarn for denim and the dyeing device

摘要

The present invention is excellent in hygroscopicity as a fabric, good warmth and touch to the skin, solid and dyed cotton yarn in a variety of colors in a small amount of dyeing to provide a denim fabric that is used a lot of industrial, living, fashion clothing The present invention relates to a dyeing method and a dyeing apparatus capable of dyeing a thin cotton yarn, as well as a thick cotton yarn, and a caustic soda diluted with water after being loaded into a carrier in a tensionless state. (NaOH) was added to the salt bath and caustic soda (NaOH) having a temperature of 5 ± 3 and diluted in water using a circulation pump was brought into uniform contact with cotton yarn so that the swelling degree was 140%. Swelling process to recover soda (NaOH), and 2-10% by weight of the reducing dye of the cotton thread skein supplied to the interior of the dyeing tank through the circulation pump 140% Presented a reduction dyes for the process is 70% shrinkage in Yoon state occurs sufficiently stable on the surface of the cotton fibers, and to the input of the hydro-selpa soluble in water Id (Na ₂ S ₂ 0 ₄₎ the reducing agent tank dyeing, stable on the surface of the yarn It characterized in that it comprises a dyeing process to reduce the reducing dye to the surface dyeing.; Dyeing tank, auxiliary tank, circulation pump, NaOH, tank, cooling tank.