Impurities on surface of cheese dyed polyester yarns and solution

In order to solve the surface impurity problems of cheese dyed polyester yarns,experiments were conducted to analyze the effects of dyeing process,oligomer disperse auxiliary,and reductive cleaning auxiliary on the content of surface impurities of cheese dyed polyester yarns.The results indicated that most of the surface impurities of cheese dyed polyester yarns are polyester oligomers,accounting for up to 73% of the total impurities.The surface impurities of cheese dyed polyester increase with the increasing of dosage of dyestuffs,dyeing temperature and dyeing time.The additive of oligomer disperse auxiliary during dyeing process and the use of particular auxiliary during reductive cleaning can significantly reduce the surface impurities.