The process requires the selection of alkali-resistant and oxygen-resistant restoration dyes, insoluble azo dyes, and evacuation dyes to dye yarn. In particular, the blood color and blue color in the restoration dyeing guess change greatly after oxygen bleaching and whitening, and experiments need to be held in advance. Pay attention to events:
1. If light staining is discovered after the decooking and bleaching method
It can be soaped by the dyeing machine for 30 minutes; or 2g/L of soda ash, 6g/L of soap, and 3g/L of detergent can be added, and the temperature should be controlled at 90~ 95 ° C. When the polyester/cotton yarn-dyed fabric is stained, it should be washed with soap first, rather than setting first. Since the stained dye is further evacuated and secreted into the fiber under the condition of setting at 180~ 190 ° C, it will be difficult to soaping after setting.
Polyester/cotton yarn-dyed fabric
After the yarn is dyed with evacuation dyes, recovery cleaning should be enhanced to avoid dye sublimation and staining during high temperature setting, especially E-type evacuation dyes.
Dyeing the yarn with insoluble azo dyes
After the yarn is dyed with insoluble azo dye, it must be soaped (more than twice) to remove the floating color as much as possible and avoid staining during steaming.
Fourth, the amount of consolidation agent EA should be greater than the amount of hydrogen peroxide
Because the yarn-dyed fabric is steamed after 45min, the H2O2 dissection is rapid, and the NaOH dosage is 6-8g/L. To remove the large surface cottonseed shell, a small batch of H2O2 should be brought after the yarn-dyed fabric is out of the steamer, so that it can be used in 90 ° C. Further oxygen bleaching in hot water, so it is necessary to improve the dosage of consolidation agent to alleviate the dissection of H2O2.
Wu, 7658 enzyme desizing
For example, if insoluble azo dyes, restoration dyes and reactive dyes are used at the same time when dyeing yarns, the one-bath process of withdrawing, boiling and bleaching cannot be accepted. Only 7658 enzyme can be used for degassing.