THE CLASS OF DYESTUFF THAT IS FUNCTIONAL STRAIGHT TO THE SUBSTRATE IN A NEUTRAL OR ALKALINE BATH.
THESE DYES ARE A CATEGORY OF EXTREMELY COLOURED NATURAL SUBSTANCES,
THE DYES WHICH ARE MOST COMMONLY USED IN DYEING OF CELLULOSE LIKE COTTON OR FLAX,
THIS IS A METHOD OF PRINTING A DYE OR WAX BY USING MIXES TO CREATE COLORS.
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When the cotton fabric dyeing is absolute, the dye liquor is drain-off completely. The fabric is washed with hot water at 40° c and then with cold water. Yet again wash the dyed fabric with soap or detergent at 60°c to 80°c for at least 10 minutes. There after again wash the dyed fabric with hot water and then with cold water. At last the dyed fabrics are taken out from the machine, hydorextuct the fabric and then dry the fabric passing through any other drying machine. Reactive dyeing is the most important method for the coloration of cellulosic fibers.
As the wool is absolutely charged and reactive dyes which are anionic, so there is a strong relation which occur between the positive fiber and negative dye and the substantively is very high which facilities the exhaustion of the bath. The process of dyeing occurs in two stages exhaustion and fixation. Exhaustion means which occurs by normal physical forces of attraction between dye and fibre. While fixation means this involves the formation of the covalent bond between the dye and the fibre. The used dye over the wool clothes are covalently bound to the fibre. All anionic dyes on wool demonstrate rough smack which can result in tipsiness with reactive dyes, if covalent attachment at tips occurs before boiling.
Degumming of silk with synthetic detergents non-ionic product like Nonyl phenol ethoxylated is approved away as pretreatment of silk. Silk can be solid color dyed with cold water using the same tub dyeing method as for cotton. The colour dye used in silk is not same as the colour dye used for the cotton. In the process the soda ash used will take away some of the shine of silk and will give the silk more of a stonewashed appearance as the exposure is limited. Silk can be dyed with almost any sort of dye. Silk is less sensitive to high pH than animal hair fibers are, which makes the most versatile of all fibers for dyeing.
A fiber – reactive dye forms a covalent bond with suitable textile functionality. The dyes worn for textile fiber are extra reactive than mono-chloro type of dyes and involve lesser temperature and milder alkali for dyeing and fixation. We are fabricating a multiplicity of products such as dyestuffs, ultramarine blue, dyes for wax printing, inkjet dyes, textile auxiliaries, enzymes, optical brighteners, specialty chemicals, menthol crystal and peppermint, laboratory reagents etc. A textile material dyed with reactive dyes have very good quality wash fastness with rating Reactive dye gives brighter shades and has moderate rubbing fastness.
Discharge printing is a process of resist printing and involves using a chemical paste called a disperse dye. This dye is used with a reactive dye as ground colour for the process to work. It also has to be cured or fixed with steam so the dye reacts with fabric and causes a colour reaction. The expulsion printing produces the brightest, lightest prints on dark – coloured garments and can be very prominent. This process can be used on natural fibres and fabrics that will discharge colour. Even if the suitability of reactive dyestuffs for release printing is not associated to the original reactive group.
Nylon is a synthetic fiber which is also known as polyamide, can be dyed with either of two entirely diverse dye classes. As nylon is appreciated for its light weight, inconceivable tensile potency, sturdiness and confrontation to damage. It is also known as the reactive dyes which are urbanized for cellulosic fibres or for wool can be functional at the boil to nylon under dimly acidic circumstances and that covalent bonds formed between the dye and the amino groups of nylon, without an alkaline fixation step. While reactive dyes usually do not comprise heavy metal such as chromium, the characteristically high wet fastness of the dyes comes with the allied recompense of brightness and low environmental collision.
Polyester requires the use of disperse dyes. In the case of other types of dyes leave the colour of polyester almost completely unaltered. The provided disperse dyes can be used in various techniques and will gladly colour the synthetics such as polyester, nylon, cellulose acetate, Vilene, viscose, synthetic velvets and PVC. These dyes can be worn to colour plastic buttons and fastenings. Their effect is less effective on polyester due to the molecular structure, allowing only pastel through to medium shades. Polyester fibre includes pores or canals inside its composition which, as soon as heated to 100°c expand to allocate particles of the dye to enter. Using the disperse dyes on natural fibres, such as cotton and wool, are not effective but can be combined with reactive dyes to colour blends of polyester. This technique is used industrially in controlled conditions.