Acid Black dyes
Acid dyestuff is to point to contain acid group, can combine with amino in protein fiber molecule with ionic bond, suit under acid, weak acid or neutral condition. The main structure is azo and anthraquinone, a few are aromatic methane structure. Dyes and colors are generally compounds that have their own color and can give other substances a bright and firm color in a molecular or dispersive state.
It can be divided into strong acid, weak acid, acid media and acid complex dyes.
1. Dip dyeing
Cotton fabric dyed with vat dyes mainly adopts dip dyeing process. According to the different processing amount, drum dyeing machine or warp dyeing machine can be selected. In recent years, in order to adapt to the high quality of cotton knitwear, liquid flow dyeing machine is also used. In addition, for the requirements of small batch and rapid processing, garment dyeing will be increased.
2. Continuous dyeing
Reduction dye suspension rolling and steaming process is used for continuous dyeing, which is suitable for large-scale fabric processing such as work clothes, overcoats and bedding; while roll dyeing is suitable for small-scale fabric; it is most suitable for wide fabrics, and can play the maximum role for thick fabrics such as tents.
3. Printing
The most common method of VAT printing is one-phase printing with potassium carbonate and anti migration agent. In Europe, the United States and Japan, a kind of high-grade printed textiles is a kind of printed cotton fabric which is dyed with reactive dyes and dyed with vat dyes. In addition. The ups method for mass processing uses two-phase printing, which is most suitable for direct printing of covers and covers.
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