Dyeing process for silk and pashm blended yarn

Abstract

The invention provides a process for dyeing silk-cashmere blended yarns, belonging to the weaving yarn dyeing technical field. The process comprises the following steps that: silk-cashmere blended yarns ready to be dyed are put in a dye vat, water is added in the dye vat, and the bath ratio is controlled; at the normal temperature, auxiliary agent and dyes are added in the dye vat; the dye vat is kept warmth at the normal temperature; at the normal temperature, salt is added in the dye vat for the first time; the dye vat is kept warmth at the normal temperature again; alkali is added in the dye vat for the first time; the dye vat is kept warmth at the normal temperature again; the dye vat is heated, and the temperature-rise speed is controlled; the dye vat is kept warmth; alkali is added in the dye vat for the second time; the dye vat is kept warmth again; salt is added in the dye vat for the second time; the dye vat is kept warmth again; finally after sequent steps of temperature drop and liquid discharging, fresh water washing, soap washing, hot water washing, color fixation, upper flexibility, dewatering and drying, dyed silk-cashmere blended yarns are obtained. The process has the advantages of high color fastness, good level-dyeing property, good homochromaatism, high breaking strength, bright color, filled yarns, uneasy teasing, time conservation, low dye cost, simple processing step, energy consumption reduction, low sewage discharge and environment protection.

Description

technical field [0001] The invention belongs to the technical field of textile yarn dyeing, in particular to a dyeing process of silk and cashmere blended yarn. Background technique [0002] Silk and cashmere blended yarn is made of silk and cashmere. Its products not only retain the soft and high-grade essence of cashmere, but also overcome the shortcomings of cashmere such as easy shrinkage and felting. Clothing made of silk cashmere is famous for its high softness, strong warmth retention, good moisture absorption and air permeability, and luxurious texture. It is a new product that has become popular in the international fashion industry in recent years, especially in France, which represents the world fashion trend. [0003] There are roughly two ingredients in silk cashmere: one is 45% cashmere and 55% silk; the other is 15% cashmere and 85% silk. At present, in order to achieve the same color of silk and cashmere, the dyeing method of silk and cashmere blended yarn m...

AI Technical Summary

Problems solved by technology

This traditional two-bath dyeing process obviously has many shortcomings: First, the process takes a long time (even if it is successful at one time, it takes more than 14 hours for one tank), many steps, and complicated operations, not only the quality of dyeing is difficult to grasp , and the quality of the yarn is also difficult to guarantee, because the dyeing of silk cashmere blended yarn is dyed with cheese, so the more process steps, the yarn at the contact point between the cheese will fluff or even cause breakage, while the silk cashmere blended white The current price of gray yarn is more than 400 yuan per kilogram, and yarn damage or breakage will cause serious economic losses and waste of resources; second, the long process time results in high energy consumption, large sewage discharge, and great impact on the environment; Third, the same color of silk and cashmere is poor

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