Special color denim fabric
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In order to increase the color and color changes of indigo denim varieties, the color-matched denim with indigo as the basic color mainly includes bromoindigo (commonly known as emerald blue in the market) denim and vulcanized black denim. “Indigo” dyed denim has two major characteristics: very deep coloring depth and very good fastness to washing and dyeing.
Because work clothes made of super indigo-dyed or ultra-dark indigo-dyed denim can obtain a special effect of rich and bright color after being washed and finished, they are widely welcomed by consumers.
“Super Indigo” dyed denim has two major characteristics: very deep color depth and very good dyeing fastness to washing. The former refers to the amount of indigo dye dyed on the spinning yarn per unit weight (generally expressed as the dye accounting for % of the dry weight of the yarn, referred to as the coloring depth %). For example, the indigo coloring depth of conventional denim warp yarns is 1%. ~3%, while the color depth of “super indigo” needs to reach more than 4% before it can be called super indigo or extra deep indigo. The latter refers to the fact that “super indigo” dyed denim needs to withstand repeated sanding and washing for more than 3 hours. Its color can still reach or exceed the color depth of conventional dyed denim without sanding and washing, and its color finish is deeper than that of conventional denim. Colored denim is much richer and brighter. The wash fastness of indigo-dyed denim essentially depends on the penetration of the dye into the yarn, rather than the wash fastness of the dye itself (the wet wash fastness of indigo is only level 1). That is, the better the core permeability, the better the sanding and dyeing fastness.
Since the coloring depth of super indigo-dyed denim is more than 60% higher than that of conventional traditional denim, the indigo concentration of the dye solution will also increase exponentially, even reaching 3~4g/L, so that it is possible to obtain a higher Intense color. In this way, the viscosity of the dye liquor increases and the fluidity becomes worse, which affects the penetration ability of the dye leuco body, reduces the wash and dye fastness of denim, and cannot meet the final depth requirements for workwear production. The higher the concentration of indigo in the dye liquor, the heavier the redness of the dyed object will be and the darker the color, and there will be no “super indigo” effect. Therefore, many production plants have already or are planning to modify the dyeing paste equipment and use the method of increasing the number of coloring passes to solve this problem. The dyeing rate is high and the color is stable. At the same time, the dyeing tension of the warp sheets is appropriately reduced, so as to obtain a better “super indigo” coloring effect.
In order to increase the color and color changes of indigo denim varieties, various overprinted denim varieties are extremely popular at present. For example, indigo over-dyed sulfur black, indigo over-dyed sulfur grass green, sulfur black green, sulfur blue, etc., to meet the individual needs of the market. At the same time, it also enables denim production plants to have new varieties of denim with patented characteristics to improve market competitiveness. What needs to be noted in this regard is that it is possible to control the concentration of the mother liquor to prevent excessive overflow of the dye liquor from causing waste of dye and expanding environmental pollution.
Colored denim mainly includes bromoindigo (commonly known as emerald blue in the market) denim and sulfurized black denim, as well as coffee, emerald green, gray, khaki, sulfurized blue denim using sulfur dyes to match colors, and a small amount of Naphtol dye Or reactive dye-dyed red, peach, feline denim, etc. Although the production batch is not large, the market demand is relatively urgent and the demand is often not met. The main problem is that the color finish is not stable enough, and the attention to coloring is also poor. The workwear manufacturer is not satisfied. This is of course related to the small production batch and too many colors. However, it is more difficult to produce different color varieties by the dyeing paste combined machine. Large, high consumption, high cost, and difficult to treat sewage, etc., also have certain impacts. The first solution is to completely reduce the number of color combinations during design. It is possible to use two color combinations and no more than three color combinations, or use other more stable dye varieties to replace them to adapt to the production characteristics of the dyestuff online machine and obtain More stable coloring effect; secondly, a more thorough solution is to adopt the production process of large-capacity coloring of yarns spun in yarn-dyed factories and section warping to produce denim of various colors, which is ideal.
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