The direct printing methods of vat dyes are: full material method and two-phase method. Full-material method: The color paste prepared by dye, reducing agent, alkali agent, auxiliary agent and original paste is printed on the fabric. After drying, it is steamed. During steaming, the dye is reduced to leuco and dyes the fiber. , And finally carry out oxidation, soaping, washing and drying. Two-phase method: the fuel and the original paste are mixed into a color paste, and after the printing is dried, the reducing solution composed of a reducing agent and caustic soda is pressed into the fast steaming machine for fast steaming. The dye is reduced and the fiber is dyed, and then oxidized , Soaping, washing and drying.
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