Discharge behaviour of single and combination colours used in silk industry

An introduction to silk dyeing is followed by a study to achieve better fastness by replacing direct colours with corresponding acid and metal complex colours with comparatively better fastness properties, also tested for dischargeability. Materials are specified with the recipe for dyeing silk. The self shades, direct and acid colours, w..

Dyeing conventional and microfiber polyester with disperse dyes

The small radius of microfibers causes some problems with the dyeing process and colorfastness of the dyed fabrics. In this study, we examine the high temperature (130℃) dyeing, light-fastness, and wash-fastness characteristics of seven different disperse dyes on both conventional (5.5 decitex per filament) and microfiber (0.56 decitex p..

Forever young - 100 years of Indanthren dyes

Rene’ Bohn discovered the first synthetic vat dye, known as Indanthren, in 1901. An extensive advertising campaign was launched in 1921

Fastness characteristics on natural and direct dyes applied on fabrics

The study investigated the effect of melanuine formaldehyde Resin and Lacrylic Resin as well as mordants on the colour fastness characteristics of natural and direct dyes. Changes brought about in the tone of shade after these treatments and after soaping were also studied, Wool and cotton samples were used. The results are presented in t..

Kinetics and equilibria in dyeing

In order to understand dyeing behaviour and control it, it is essential to conduct measurements of equilibrium and kinetics. Absorption isotherms are presented to assist in characterizing and classifying the dye-fibre sorption process. The diffusion of the dye from the fibre surface to the interior of the fibre is then discussed, together..

Enzymatic decolourisation of denims: A novel approach

Denim fabric construction is explained and the normal processing methods including wetting, desizing, biofading, bleaching (optional) and softening. Other colouring factors are explained with the common use of sodium hypochlorite as the oxidizing agent for decolourising the indigo dye as required. It is judged not an eco-friendly procedur..

Study of the effect of technical factors on the decolorizing of solutions of acid brown dyes by a photochemical method (Russian)

Investigations reveal that, at dye concentrations of 5-10 mg/1, 90-98% decolorizing of the effluent is achieved after 10-30 min ultraviolet treatment at a radiation of 20-30 kW and a peroxide concentration of 10-15 mg/mg dye. Effluent decolorizing by a photochemical method is possible in the case of a suspended matter concentration of 100..

Treatment of dye-bearing wastewaters

The use of a low cost adsorbent could bring down the cost of decolorization of textile wastewater to a substantial extent. The authors undertook a study of the use of paddy husk, which is cheap and readily available as an agricultural waste material. The dried husk was carbonized and sieved; the dye used was malachite green. Results are s..

Application of Bentonite for decolorization of waste water from dyeing effects of added inorganic electrolytes (Japanese)

The application of bentonite on decolorization of waste water from dyeing containing direct and acid dyes has been evaluated with particular regard to the effects of added alkali halides with different size of anions and cations. The addition of the inorganic electrolytes was found to enhance decolorization of the waste water by bentonite..

Effect of water quality characteristics on oxidative decomposition of dyeing wastewater by ozonation combined with hydrogen peroxide (Japanese)

The effect of water quality characteristics on oxidative decomposition of yarn dyeing wastewater by ozonation combined with hydrogen peroxide was investigated. As a sample, it used the wastewater(Sample a) of rinsing and the treatment water(Sample b) which was treated with the coagulation-precipitation and the activated sludge process of ..