How to dye color black to “deep black”? Pre-Dyeing

① Preparation of blanks: processing general black, the requirements of blanks can be a little lower, if there is no mold, does not contain polypropylene filaments and polyester filaments, etc. blanks will not have any problems, but if the fabric is dyed “black”, the requirements of blanks should be higher, the maturity of the blanks of the cotton fibers should be high, so that the processing out of the fabric! Color absorption rate will be improved.

② burnishing process: burnishing process is no special requirements, but burnishing clean, cannot have the paste staining which is the most basic requirements of the burnishing process, as the dyeing of black fabrics, semi-products should also pay attention to this point.

③ Desiring and boiling process: the requirements of black fabrics for desizing and boiling of semi-products are that desiring should be as even and clean as possible, the concentration of boiling alkali should be higher as possible, the boiling temperature should be higher, and the boiling time should be longer.

④Bleaching process: black fabric semi-products in the whiteness requirements are not very high, but the whiteness must be uniform, therefore, the concentration of hydrogen peroxide can be relatively low, the concentration of hydrogen peroxide can be controlled at about 4g/L. ⑤Acid washing: the fabrics should be cleaned as much as possible, the concentration of alkali in boiling should be higher, the boiling temperature should be higher, and the boiling time should be longer. ⑤ Pickling: metal salts on the fabric although there is no obvious adverse effect on the dyeing of black, but the fabric pickling is also necessary, desizing pickling can ensure that the fabric into the rinse solution before the alkali, to prevent fluctuations due to the pH in the rinse solution affects the whiteness of the consistency of the mercerized pickling to ensure the stability and consistency of the fabric in the dyeing process to prevent mercerizing to alkali caused by the inconsistency of the fabric with alkali With alkali inconsistency and color difference. (6) mercerizing process: black fabrics mercerizing requirements are mercerizing alkali concentration should be high, rolling alkali tank caustic soda concentration control in 250g / L or so, mercerizing tension can be smaller, mercerizing alkali should be uniform, clean.

Dye Screening

Dyestuff Characteristics: Spectral analysis of existing dyestuffs, measuring the reflectance curves of dyestuffs in the visible region under different light sources in dark, medium and light concentrations, to provide information for the selection of dyestuffs.

② Dye Matching: According to the customer’s specified light source and order requirements, based on the black dyes, the best matching dyes and dosage are selected among similar dyes according to their dyeing characteristics. Generally, the supplier will adjust the color light of black dye to the blue and green, so that it is convenient to adjust the depth in the dyeing process, and seldom adjust the color light of black dye to the yellow or red, if we want to dye the fabric with the effect of “black”, it is necessary to reduce the blue and green light of black dye, so that it can improve the depth of black more quickly, so when dyeing black, it is necessary to reduce the blue and green light of black dye. Black depth, so when dyeing black generally used to add some red and yellow dyes is the reason, in order to improve the visual depth, often red and yellow dyes in the adjustment will be a little heavier.

Process control

① in the steam solid color, solid color solution pH can be controlled at about 12, steam time control at about 75s, out of the steam box mouth full width cold water shower to strengthen.

② soaping to be sufficient, soaping solution should be added 1 ~ 2g / L chelating dispersant, to be fully washed, the fabric should not be alkaline.

③Stretch finishing solution in addition to the normal addition of a variety of additives, you can also add 2g / L of Swire oil.

④Shrinkage prevention, the front of the fabric should be in contact with the rubber blanket to prevent laser printing.

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