5 pre-treatment methods for dyeing fabrics to obtain dark colors

1 Strengthen the removal of impurities and contamination of contaminated materials

With sufficient pre-treatment, the fabric has good wettability and a large capillary effect, the diffusion ability of dye molecules to the dye may increase, thereby increasing the dye uptake rate. Therefore, strengthening the treatment of impurities and decontamination of contaminated materials can achieve the above purpose.

2 Silk finishing treatment of cotton fabrics

The dye adsorption capacity of cotton fabrics after silk finishing is significantly improved. Compared with cotton fabrics without silk finishing, it can achieve medium and dark colors and improve the surface finish.

3 Alkali weight reduction treatment of polyester fabric

Polyester macromolecules have high crystallinity, tight fiber structure, high refractive index and surface reflectivity, smooth fiber surface, mainly specular reflection after being dyed black with disperse dyes, because there is a large amount of The reflection is completely reflected from the fabric surface and enters people’s sight in white, so deep black is difficult to obtain. After the alkali reduction treatment, the original smooth surface of the polyester becomes a rough surface, forming a concave and convex irregular reflective layer, which is what we often call the etching effect, and produces a certain dark color effect, and after the reduction treatment The freedom of movement of the fabric increases and the adhesion of the dye increases.

4 Application of low-temperature plasma technology

Plasma technology is a method of treating the fabric surface, and it is a dry cleaning physical finishing method of modern coloring technology. For example, after plasma-treated polyester fiber is grafted and polymerized, a low-refractive index film is formed on the surface of the fiber, which can significantly improve the dyeing rate and color depth; another example is that after plasma treatment of linen fabrics that are difficult to dye, The capillary effect of the fabric is 1 to 1.5 times that of untreated fabrics, which greatly increases the amount of dye adsorption, making it easy to dye deep and dense colors, and the dark effect is obvious.

5 Ultrasonic technology treatment

Ultrasound is a vibration wave that cannot be sensed by the human ear. Sound waves with normal frequencies between 104 and 109 Hz are called ultrasonic waves, while those with frequencies greater than 109 Hz are called special ultrasonic waves or microwave ultrasonic waves. After the fabric is treated with ultrasonic technology before dyeing, the fiber concentration will be loosened to a certain extent, which will increase the specific surface area inside the fiber, thereby increasing the adsorption capacity of the fiber to the dye, improving the dye uptake rate of the fabric, and achieving medium and dark colors. . After research, this technology has obvious effects on wool fibers with scale layers and linen fabrics with tight surface structures.

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