Process Description:

Pre treatment water washing: The main purpose is to remove oil stains on the surface of the yarn and other impurities that affect the dyeing performance, improve the dyeing quality. The pre treatment temperature is generally around 50 ℃, and the bath ratio is 1:6. According to the product color and customer requirements, it is generally cleaned three times.

Dyeing: According to the customer's requirements, different dyes and additives are added to the dyeing machine, and the yarn is colored at a certain temperature and pressure. Steam indirect heating is used for heating. The cylinder temperature is 50 ℃, and the dyeing temperature is around 85-98 ℃ (wool 98 ℃, cashmere 85-90 ℃) to disperse the dye inside the yarn. The dyeing heating rate is 2 ℃/min, and the insulation is 40-60 minutes. After the insulation is completed, the dyeing solution is cooled to about 70 ℃ and discharged, and enters the subsequent water washing process. The bath ratio during the dyeing process is 1:6.

Washing after dyeing: The dyed product needs to be washed with water to remove any floating color residue on the surface of the yarn. In order to ensure the quality of product dyeing, the enterprise conducts two washes. The washing temperature is about 50 ℃, and the bath ratio is about 1:6.

Soap washing: In order to further remove the floating color residue on the surface of the yarn, pure alkali, insurance powder, and water are added under alkaline conditions, and the soap washing temperature is 80 ℃. The heating rate is 2 ℃/min. Cool down to around 70 ℃ and discharge, and enter the subsequent water washing process.

Soap washing followed by water washing: four light colored cleaning cycles, with the first cycle using the last cycle for drainage, and the actual wastewater discharged into the sewage station using three cycles of cleaning water; There are five dark cleaning processes, with the first cleaning process using the last cleaning process for drainage, and the actual wastewater discharged into the sewage station being four cleaning processes; The washing temperature is about 50 ℃, and the bath ratio is about 1:6.

Softness: To increase the softness of the yarn, a softener is added to the water and subjected to softening treatment at 50 ℃, with a bath ratio of about 1:6.

Dehydration: Place dyed, softened, and other processed yarn into a dehydrator for dehydration.

Drying: The dehydrated yarn enters a dryer for drying (approximately 70-90 ℃), which uses steam for indirect heating. After the drying is completed, the qualified products are packaged and stored in the warehouse.

Yarn dyeing process flowchart