To obtain dark colors from dyed fabrics, it is closely related to the pre-treatment of the fabrics. You can refer to the following points.
1. Strengthen the removal of impurities and contamination of dyed 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. Mercerizing treatment of cotton fabric
Cotton fabrics after mercerization treatment, which is resistant to dyes The adsorption capacity is significantly improved. Compared with cotton fabrics without mercerization treatment, it can achieve medium and dark colors, and the surface gloss is improved.
3. Alkali weight reduction treatment of polyester fabric
Polyester macromolecules have high crystallinity and fiber structure Tight, high refractive index and surface reflectivity, smooth fiber surface, mainly specular reflection of light, after dyeing black with disperse dye, because a large amount of reflected light enters people’s sight from the surface of the fabric as white light, so it is deep black Harder to obtain. After alkali weight reduction treatment, the original smooth surface of polyester becomes a rough surface, forming a concave and convex irregular reflective layer, which is what we often call the etching effect, resulting in a certain dark color effect, and the fabric after weight reduction treatment The activity increases naturally and the adhesion of the dye increases.
4. Application of low-temperature plasma technology
Plasma technology is a treatment on the surface of fabrics The method is dry cleaning physical processing that belongs to modern dyeing 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 fabric The capillary effect is 1~1.5 times that of untreated dyes, which greatly increases the adsorption capacity of dyes. It is 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 detected by the human ear, with a normal frequency Sound waves 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 is loosened to a certain extent, which increases 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. </p
