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  • How to test polyester crease during dyeing process?


    There are many factors that affect the creases of indefinite embryo tissues in the production. The experiment provides help for mass production by analyzing the influence of different factors on the creases. The model used in the test is a large 1-tube AK DSL 250 type Asian water flow tank. The test Read More

  • What is the reaction mechanism of reactive dyes?


    Reactive dyes are used for cellulose fiber dyes, generally through three stages of adsorption, diffusion and fixation:There is no covalent bond reaction between the dye and the fiber during the adsorption and diffusion process. When the alkali agent is added to make the pH of the dye bath alkaline, Read More

  • What are the major categories of reactive dyes?


    The active groups are monochloro-s-triazine and vinyl sulfone heterobi-reactive dyes. The commodity categories are named differently, mainly including M type, B type, RR type, BF type, BH type (partial), etc. The recommended dyeing temperature is 60~80℃. Due to the synergistic effect of two differen Read More

  • The effect of disperse dyeing?


    The thermal migration of disperse dyes is not the redistribution of dyes in the two phases of fiber and surface solvent under dry heat conditions, but its inherent physical characteristics, which also cause the color fastness and shade variation of polyester-containing fabrics to decrease during dry Read More

  • What are the reasons for the yellowishness and darkness during dyeing?


    Ø The pH value of dyeing is unstable, and the precipitation pH of alkaline substances tends to be neutral as the dyeing temperature rises.Ø Reducing substances such as sodium lignosulfonate in the dye, formic acid or citric acid in the dye liquor have a greater impact on the color change of the turq Read More




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