Analysis of the causes of stains on dyed denim fabrics
Denim clothing dyed fabric stains
1. Water quality problems. Poor water quality can also cause yellow spots. The main reason is that the water quality contains divalent iron ions, which can be oxidized into Ferric iron ions will form yellow spots on the cloth, which will not be noticed for a while after bleaching, but will be easily revealed after dyeing.
2. After sodium hypochlorite bleaching, the residual chlorine cannot be completely washed away and affects reactive and direct dyeing. Although it has been dechlorinated with sodium hypochlorite, has the residual chlorine been completely removed? , the potassium iodide-starch test should be used as the standard. If too much soda is used for dechlorination, residual sulfur on the cloth can also cause yellowing.
3. Immediately fix the color if the water is not clear after dyeing. Since the dye is anionic and the fixing agent is cationic, certain effects may occur due to the charge effect. Dye discoloration or color change.
4. Using amino silicone oil for softening can sometimes make the cloth surface partially yellow.
5. The drying temperature is too high, which can cause local discoloration of the dye.
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