How to Control the Color of Indigo Knitted Denim Fabric

Denim clothing is famous for its special style of local fading and imitation, and is loved by a wide range of consumers. Starting from the first pair of jeans presented at the gold mine in Texas, cowboy styles are changing between elegance and casual leisure. More and more people have different styles of cowboy clothes. With the continuous expansion of the consumer market, the requirements for multiple types and patterns of denim fabrics are becoming more and more intense. Knitted denim fabric is deeply sought after by consumers because of its unique knitwear characteristics, such as elasticity, softness and air permeability. Before the style treatment of knitted denim clothing such as white pulling, sanding and imitation, the small knitting company of knitted denim fabric feels that how to accurately control its water washing color fastness has become a problem worthy of discussion.

Production process of indigo knitted denim fabric:1. Process flowPure cotton yarn, indigo dyeing, winding, weaving, post-treatment

2. Production features

In order to ensure the minimum color difference of indigo yarn during weaving, warp dyeing is selected. In this way, all yarns on the same shaft are dyed in the same cylinder to ensure consistent color. Then the indigo yarn on the warp axis is separated into bobbins and woven on circular weft machines. In weft weave design, the knitted denim fabric company suggests that the fabric structure close to the appearance of traditional denim should be selected as far as possible. Generally, the front side is exposed with indigo yarn, the reverse side is exposed with pure white cotton yarn, or there is a little white in indigo, which is closer to the style of traditional denim fabrics.

3. Factors affecting the color fastness of fabrics to washing

Indigo yarn is generally dyed with recovery dyes. These dyes are insoluble in water and contain carbonyl groups in the molecular structure. During dyeing, they need to be recovered into soluble leucosomes in the alkaline medium with insurance powder, and the dyed fiber forms insoluble dyes after oxidation and is fixed in the fiber. The dyeing process includes four processes: dye recovery and dissolution, Leucosome dyeing, Leucosome oxidation and post-treatment. Knitted denim fabric is a yarn dyed knitted fabric woven by Indigo cotton yarn and pure white cotton yarn. The lower machine grey fabric has no other treatment after setting, so it has poor color fastness and is easy to fade and stain. Therefore, washing has become an important factor affecting the color fastness of indigo knitted denim fabric.

The researchers of knitted denim fabric company have proved through many experiments that strengthening the water washing floating color treatment of grey fabric in the production process can improve the water washing color fastness of indigo knitted denim fabric.