Strip dyeing and recombing process
1. Coloring process The quality of dyed, combed and mixed strips is the guarantee for smooth spinning. For strip-dyed products, in addition to requiring accurate color finish, strip-dyeing quality should also focus on reducing fiber damage and floating colors to ensure certain dyeing fastness. The three fibers have different holding properties, and the coloring process and formula are also different. Therefore, the coloring should be done separately, and the temperature should not be too high and the time should not be too long. 2. Recombing process: Wool, silk, and linen fibers are mixed into strips for recombing. The process quality requirements are also different from those of general blended chemical fiber fabrics. Attention should be paid to the following during re-combing production: (1) Appropriately increase the number of mixing times for combing to ensure that the raw materials are mixed evenly. Generally, 4-5 times of mixing should be carried out before combing. (2) Compared with ordinary varieties, this type of mixed carded sliver has a larger total linear density CV value and length CV value of the fiber, and more defects such as lint are produced during needle carding. Each needle plate, needle plate, etc. should be dealt with before production. The round comb and top comb of the combing machine should be inspected and cleaned to prevent broken or bent needles. Do a good job of cleaning during production, especially the round comb, top comb and skin board of the combing machine. (3) Pay attention to the impact of temperature, humidity and moisture regain on top quality during finishing, and ensure that the temperature and humidity in the workshop are between 75% and 80%. (4) It is required that the colored tops stored in the warehouse should have wool grains ≤ 25 pieces/piece, quality unevenness ≤ 1.5%, moisture regain rate 16%-18% or less and short hair rate ≤ 2%, which can completely reduce the production cost due to excessive short hair. Small yarn hairiness.
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