Dyeing Quality Control Of Cashmere Knit Cone Yarn

According to the"popular designs, fashionable"clothing consumption, enterprises could gain the market if time to volume. Cashmere knitwear applicables to some products which are small quantities, various and multi-colour, because of its adopting yarn dyeing, short-term and efficiency, so yarn dyeing is increasingly important. At present most hank dyeing is used, but a lot of drawbacks there. Hank dyeing can not be used in large-scale quantity production, more difference between batches, colour easy to spend ,more expenditure, damage seriously and final fabric feels is not good. Cheese dyeing can effectively avoid such shortcomings. As a result of knitwear and woven fabrics are different from the preparation method , the requirements of colour difference is more stringent, such as to cashmere knitting yarn cheese dyeing is used less in the current domestic, the technology is not pefect, product quanlity is instable, so it is necessary to discover the technology and self-levelling of wool cheese dyeing.Colour difference is the most common quality problem in printing and dyeing enteiprises, especially in the cheese dyeing process. There is curtain colour difference consist in different location, because of the winding closely yarn, how to eliminate and reduce the colour difference in the inner ,middle and outer of yarn. Colour difference is produced in a wide range of factors, it not only involved in dyeing processes and technology ,but also with the management and operation of equipment as well as the dyes are colsely related. The whole process is very complicated, any one of the improper operation will be impact on the final product quality.In this thesis, a cheese dyeing cashmere as an example, experiments and tests combinated producting are taken in the Ordos Group Technical Center and the Dong Xu dyeing company, they mainly analyze aspects of all linkes in dyeing process from the physical and chemical properties of wool, cheese structures, dyeing performance and dyeing technology, etc. adopting single-factor experiments and orthogonal test analyzes the influence on all factors of colour difference, these factors include the following: yarn winding density, temperature rising curve, dye flowrate, circulating pump speed, dyebath pH, salt quatity, dye leveller, liquor ratio and holding temperature, etc. Founding the most important factor of colour difference , adjusting reasonable parameters of the dyeing process, drafting optimization process curve which adjusts production and taking production practice by useing optimized technological parameters and technology curve. The result shows there is no colour difference in the dyed yarn which used on the knitwear, attains the purpose of eliminating colour difference by cheese dyeing and ensures comprehensive performance as clothing of products.