Cashmere Knit Cheese Dyeing Process And The Levelness Of Discussion

The dyeing for cashmere yarn is becoming more and more important with the variation of market. Yarn dyeing for cashmere knitwear has the characteristics of short period and high efficiency, so it's applicable to products with small quantity, large variety and ample style.Most of cashmere yarns are hank dyed which has many disadvantages, such as it's difficult to be batch produced in large quantity of hank dyeing, more differences easily occur between different batches, colored spots easily occur with high consumption and severe damage to the strength of cashmere yarns, furthermore, the hand feeling of such dyed cashmere knitwear is worse, while package dyeing can effectively avoid such defects. So it's necessary to investigate and discuss the level-dyeing property of cashmere package-dyed yarn because of the small quantity of package-dyed cashmere yarns used for knitwear domestically, the faultiness in dyeing process and the instability of product quality.This project discuss the influences exerted on level-dyeing property of various parameters from different sections, such as dyeing process and dyeing equipment etc, based on the theoretically research and mass production practices in order to find the optimal controlling point and process parameters to improve level-dyeing property and to stabilize the product quality.The physical and chemical properties of cashmere fiber and rationally selection of dye stuff and auxiliary are studied in this paper. The influences during different sections in dyeing process on leveling dyeing property are analyzed and different problems encountered in mass production practices are summarizedThe performances of advanced automatic package dyeing equipment and its matching apparatus are investigated and understood to fine the optimal technical parameters for the equipment so as to achieve the optimization of technical parameters. Research results based on tests and trials show that the density during winding and shape formation of package yarn is the key factors to improve level-dyeing property except for some conventional controlling points such as, dyeing temperature, dyeing duration and Phvalue etc. If the winding density is improperly selected for woolen and worsted yarns, it's probably the occurrence of color difference between internal layer and external layer of package dyeing yarns. The color difference among different cones is also easy to be found in the same dyeing vessel if there is difference on package shape or package weight among different cones. The rational density parameters are stipulated and effective density consistency controlling method is also summarized in this paper.This project also studied the influence of various process parameters on color difference, color fastness and hand feeling etc. The functions of different auxiliary on level-dyeing property are also explored. A optimal scheme of rationally selected and used parameters from dyeing equipment and dyeing process, and from dye stuff to dyeing auxiliaries are summarized to guarantee the level dyeing property of product to improve the comprehensive wearing performance.The research on level dyeing property of package yarn for cashmere knitwear is deemed to promote the batch production of package dyeing, to improve the production efficiency of cashmere knitwear, to meet the demand of market and increase profits.