Yarn dyeing method

Abstract

The invention discloses a yarn dyeing method, comprising the steps of yarn pre-treatment, dyeing with at least one reactive dye, fixation and aftertreatment. In the step of fixation, relation between dosage of a colour fixing agent and the total dosage of the reactive dye is as follows: (a unit for the dosages of the reactive dye and the colour fixing agent is expressed by OWF (on weight the fabric), namely percentage of the reactive dye or the colour fixing agent relative to weight of the fabric): (1) when the dosage OWF of each reactive dye in reactive dye combination is less than 1%, the dosage of the colour fixing agent is 0; and (2) when the total dosage OWF of the reactive dye is more than or equal to 1% and less than 3%, the dosage OWF of the colour fixing agent is 1%; and reactive dyes under the conditions (1) and (2) do not contain yellow reactive dye or orange reactive dye. By adopting the yarn dyeing method disclosed by the invention, the dosage of the colour fixing agent is reduced, and effects of energy conservation and emission reduction are realized.

Description

technical field [0001] The invention belongs to the field of textile printing and dyeing, in particular to a yarn dyeing method. Background technique [0002] In the yarn dyeing process, usually after the cotton yarn is dyed with reactive dyes, it is necessary to use a color-fixing agent to fix the yarn to improve the color fastness of the yarn and prevent the yarn from being damaged in the subsequent processing. The problem of discoloration or staining caused by the hydrolysis of reactive dyes ensures that the color fastness test of the finished fabric is qualified. In general, yarn dyeing requires a combination of reactive dyes for color matching (usually three reactive dyes), the colors of commonly used reactive dyes include red, yellow, blue, black, etc., and the amount of color fixing agent is based on a The total amount of all reactive dyes in the reactive dye combination is calculated. [0003] The following table correspondence is an example: [0004] Tot...

AI Technical Summary

Problems solved by technology

[0005] If the yarn is dyed yellow or orange, yellow and orange reactive dyes are used in the largest amount in the combination of reactive dyes. Their characteristics are that the color often looks lighter and brighter, but in fact the amount of reactive dyes is relatively high, corresponding to color fixation. The dosage of the agent is also relatively high, because the fixing agent has a relatively strong affinity for reactive dyes, it is easy to be contaminated with other colors of hydrolyzed reactive dyes in the process of mercerizing after weaving, resulting in staining

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