What Reasons Caused Speckle on Denim Garment Dyeing Fabrics?

1, The issue of water quality, poor water quality also produce scorch mark, mainly due to water quality containing divalent iron ions, can be oxidized to the ferric ion, which will form the scorch mark on the cloth, but are not able to find after bleaching, it is easy to be revealed after dyeing.

2, After sodium hypochlorite bleach, can not completely wash away the residual chlorine and will affect the activity, direct dyes, despite soda dechlorination, though antichloration with sodium hyposulphite, whether the residual chlorine will get rid, should use potassium iodide - starch test as the standard. If excessive amount of soda dechlorination, cloth residual sulfur can also cause yellowing.

3, Water is not clear after dyeing and immediate fixation, since the dye is anionic, and fixing agent IS cationic, due to charge effects caused certain dyes change color or color change.

4, Use amino silicone oil to be softening, sometimes make fabric locally yellowing.

5, The drying temperature is too high, to make dyes produce flare locality .