Cowboy clothing to local faded, the old style of the special style known to the world, by the vast number of consumers. The first pair of jeans from the Texas gold mine, the cowboy style in the elegant and casual casual between the ever-changing, more and more people have different styles of jeans. With the continuous expansion of the consumer market, more and more varieties of denim fabric, more and more strong demand. Knitted jeans fabric with its unique features of knitwear, such as elasticity, soft, breathable advantage, won the consumers sought after, and before daybreak on knitted denim clothing, matte, imitation of old style, how to accurately control the colour fastness to washing, has become a problem worth discussing.

The production process of indigo knitted denim fabric:

1 process flow

Pure cotton, indigo dyeing, weaving, winding, postprocessing.

2 production characteristics

In order to ensure the minimum color difference of indigo yarn weaving, the warp beam dyeing yarn. In this way, all the yarns on the same shaft are dyed in the same VAT to ensure that the color is consistent. Then the warp yarns are made of indigo cheese on circular weft weaving. In weft organization design, design as far as possible to choose the fabric structure similar to the traditional appearance of denim. General use positive for yarn indigo revealed, opposed to pure cotton yarn exposed or Indigo have slightly the thief, which is much closer to traditional denim fabric style.

3 factors affecting the color fastness of fabrics

Indigo yarn is usually used with vat dyes, the dyes are insoluble in water and in the molecular structure containing carbonyl and dyeing need in alkaline media insurance powder reduced to soluble leuco and dyed fiber by oxidation to form an insoluble dye fixation in the fibers. The dyeing process should be 4 steps: reduction and dissolution of dyes, dyeing of the hidden body, oxidation of the hidden body, and post treatment. Knitted jeans fabric is weaved by Indigo cotton and white cotton yarn dyed fabric, knitted fabric, the machine fabric setting not after other treatments, poor color fastness easily fade stain. Therefore, water has become an important factor affecting the indigo knitted jeans fabric color fastness.

Researchers through a lot of experiments have demonstrated that, in the process of strengthen the fabric washing floating color processing, can improve the water washing color fastness of the indigo denim fabric knitting.