The unique "secrets" of the indigo blue denim fabric

Tones based on indigo color To increase the color and shade of indigo denim varieties, the color (blue) denims are mainly bromoindole blue (marketingly known as turquoise blue) denim and vulcanized black denim, super indigo dyed denim The cloth has two major characteristics: it has a particularly deep dyeing depth and a particularly good rubbing fastness.

Since the garments made of super indigo dyeing or deep indigo dyed denim have been milled and processed, they can obtain a special effect with rich and bright color, which has been widely welcomed by consumers.

The “Super Indigo” dyed denim has two major features: it has a particularly deep dyeing depth and a particularly good rubbing fastness. The former refers to the amount of indigo dye that is dyed on a unit weight yarn (usually expressed as % of dye on the basis of the dry weight of the yarn, referred to as the dyeing depth%). For example, the denier depth of conventional denim warp yarns is 1% to 3%. However, the depth of "Super Indigo" dyeing needs to reach 4% or more. It can be called Super Blue or Extra Deep Blue. The latter refers to the "Super Indigo" dyed denim clothing required to withstand repeated grinding more than 3 hours, its color is still able to meet or exceed the color depth of the conventional dyed denim without rubbing, and its color light than conventional dyeing denim Rich and bright much more. The rubbing fastness of indigo dyed denim depends on the degree of penetration of the dye on the yarn, rather than on the scrubbing fastness of the dye itself (indigo wet rubbing fastness is only 1 grade). The better the degree, the better the rubbing color fastness.

Since the depth of dyeing of super-indigo-dyed denim is more than 60% higher than conventional denim dyeing, the indigo concentration of the dyeing solution will also be doubled, even reaching 3 to 4 g/L. Color. In this way, the viscosity of the dyeing liquor increases, and the flowability deteriorates, which affects the penetrating ability of the leuco dye body, reduces the rubbing fastness of the denim fabric, and does not meet the demand for the final depth of the clothing production. The higher the indigo concentration in the dyeing liquor, the heavier the red light of the dyeing and the darker the color, there is no effect of "super indigo." Therefore, there are many manufacturing plants that have or are preparing to reform the dyeing and joining equipment and use the method of increasing the number of dyeing lanes to solve this problem. The dyeing rate is highest and the color is stable. At the same time, the dyeing tension of the warp yarn sheet is appropriately reduced, so that a better “super indigo” dyeing effect is obtained.

Indigo-based color-coded denim fabrics In order to increase the color and shade of indigo-blue denim breeds, various tweed denim varieties are currently very popular. For example, indigo dyeing vulcanized black, indigo dyed vulcanized grass green, vulcanized black green, vulcanized blue, etc., to adapt to the needs of the market personalized. At the same time, denim manufacturers have their own patented denim new varieties to improve the market's competitiveness. In this regard, it should be noted that the concentration of mother liquor should be controlled as much as possible to prevent excessive dye overflow and cause waste of dye and increase environmental pollution.

The main colored denim fabrics are Bromoindole blue (marketed as cyan blue) denim and vulcanized black denim, as well as coffee, emerald green, gray, khaki, and vulcanized blue denim with sulphur dyes, and a small amount of naftural dyes. Or reactive dyes dyeing red, pink, tan denim, etc., although the production volume is not large, but the market demand is more urgent and often can not meet the needs. The main problem is that the color shade is not stable enough, and the importance of dyeing is also poor. Garment manufacturers are unsatisfied. This is related to the fact that the production volume is not large and the color species are too much. However, it is difficult to produce the colored varieties by the dyeing and compounding machine. Large, high cost, and difficult to deal with sewage, etc., have a certain impact. The solution is to minimize the number of fight colors in the design, use the best fight colors as much as possible, and use up to no more than three fight colors, or replace them with other more stable dyes to meet the production characteristics of the dye-online on-line station and obtain better results. Stable dyeing effect; Second, a more thorough solution is still to use dyeing factory yarn dyeing, cutting the whole warp production process route to produce more suitable denim.

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