2results about How to "Evenly dyed" patented technology

This invention provides a method for dyeing with vat dyes in an overflow dyeing machine. The use of a dye premix significantly improves dyeing performance. The cationic properties of modified cationic starch electrostatically adsorb onto fabric fibers, allowing the coated dye particles to quickly and evenly adhere to the fabric surface. This avoids localized color differences caused by uneven dye dispersion in the dye bath, and the water flow impact in overflow dyeing prevents localized dye aggregation, effectively improving dyeing uniformity and ensuring consistent dyeing results for the same batch of fabrics. The stable structure formed by the cross-linking of modified cationic starch and vat dye forms a protective film on the fabric fiber surface after color fixation, enhancing the binding stability between the dye and fiber, reducing damage to dye molecules from external factors such as light, improving the dye's lightfastness and the fabric's sunlight fastness. Its film-forming properties also make the dye and fiber bond more firmly, preventing fading.

The application discloses a method for manufacturing ring-dyed-like yarn from waste pure cotton fabric, and yarn and fabric, and belongs to the field of textiles. The method comprises the following steps: crushing white waste pure cotton fabric into loose fibers; dyeing the loose fibers into first loose fibers, second loose fibers and third loose fibers with gradually deepened colors; additionally dyeing long-fiber cotton into colored cotton fibers with a color deeper than that of the third loose fibers; and spinning to obtain ring-dyed-like yarn. During the drawing process, slivers formed by the colored cotton fibers, the first loose fibers, the second loose fibers and the third loose fibers are arranged in the same plane in the order of deep to shallow and shallow to deep according to the colors. Finally, yarn with gradually shallower colors from the outside to the inside can be obtained, which has a ring-dyed-like effect, is beneficial to making the unique aging effect of denim fabric, and enables the long-fiber cotton to be on the outermost side during the drawing process, which is beneficial to improving the strength of the yarn, making up for the insufficient strength of the loose fibers and making the denim fabric have a relatively rough effect.