Process for dyeing yarns with vat dye

Abstract

The invention discloses a process for dyeing yarns with a vat dye. The process flow comprises dye preparation, suspension cold dyeing, alkaline circulation, sodium hydrosulfite circulation, heating reduced dyeing, heat preservation standing, cooling absorption, washing oxidation, soaping and softening. When dyeing starts by using the process, the dye in a dye bath is in a non-reduced state at room temperature and is not in direct contact with fibers, and the dye and chemicals are uniformly distributed on the fibers by low-temperature circulation. As the temperature rises, the dye is gradually reduced into direct leuco sodium salt, and the fibers on which the dye is uniformly distributed are uniformly dyed.

Description

[0001] technical field [0002] The invention belongs to a dyeing process, in particular to a yarn vat dye dyeing process. [0003] Background technique [0004] Whether it is fabric or yarn, dyeing with vat dyes, no matter what the dyeing process is, the dye is reduced to leuco - leuco dyes the fiber - leuco is oxidized to dye - soap washes the color and washes it off Floating color four steps. However, the initial dyeing rate of leucosomes is high, the dye migration is poor, the level dyeing and penetration of the dyed matter are poor (color flower and white core), and the pre-reduction operation is complicated. In yarn dyeing, traditional skein dyeing, and some enterprises adopt leuco dyeing, but it is difficult to obtain satisfactory results by using leuco dyeing in package dyeing. [0005] Contents of the invention [0006] In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a yarn dyeing process wit...

AI Technical Summary

Problems solved by technology

However, the initial dyeing rate of leucosomes is high, the migration is poor, the level dyeing and penetrating properties of the dyed matter are poor (color flower and white core), and the pre-red...