A Demonstration of Reuse of Spent Dyebath Water Following Color Removal with Ozone.

A reserach project investigated the feasibility of using ozonation to renovate spent reactive dyebath effluents and of using the decolored water for subsequent dyeings. Trials utilized ten commercial shades and performed dyeings of cotton fabrics in a tumbler dyeing machine, which was designed to collect the spent dyebath. A continuous oz..

Waste minimization opportunities in textile dyehouse

The textile wet processing sector is a very improtant sector for the Indian economy as the largest foreign exchange earning sector. Much of the wet processing is done in the small/decentralized sector, which is also characterized by a major pollution problem. However, these units can not afford waste treatment. Further, tightening environ..

Effuent purification methods for indirect discharge

The methods currently available for the treatment of dyehouse effluent to be indirectly discharged are presented. The systems described are precipitation/reductive effluent treatment, oxidative dyestuff destruction, filtration/adsorption, splitting of oil/water emulsions and polymer dispersions, stripping and condensation by evaporation a..

Quicksilver: simplified rapid dyeing system for polyester and cotton

A project designed to develop a procedure for the rapid dyeing of 100％ polyester, 100％ cotton and all blend ratios in between is described. Called Quicksilver, the approach taken to develop the overall program and the benefits derived from an open relationship with a customer are examined.

Quality control and the centre selvedge dyeing defect

Instrumental methods of controlling the difference in colour between centre and selvedge are described. This defect should be checked at least twice during the production process: after dyeing and drying; and after finishing. Some cause of this defect are discussed, with reference to cotton destined for clothing dyed using reactive dyes a..

Mixing and delivering automatically

An automatic chemical and dyestuff metering and dispensing system has been developed by British company, Kinder Industrial Systems. The computerized system can handle up to 50 different liquids and operates gravimeterically weighing and delivering precise amounts.

Decoloration of bifunctional chlorotriazynil azo dye with H₂O₂/UV

The possibility of successful decoloration of chlorotriazynil reactive azo dyes with H₂O₂, activated with UV energy, is described. Results are evaluated with ecological parameters (intensity of dye, velocity of decoloration, COD, TC and BOD). The influence of concentration and the composition of dye solution as well as the intensity of ..

Quicksilver: Simplified Rapid Dyeing System for Polyester and Cotton.

In 1994, several chemical manufacturers participated in Quicksilver, a program to streamline procedures for the rapid dyeing of 100 percent polyester, 100 percent cotton, and all polyester/cotton blend ratios. When analyzing current systems into component steps, participants uncovered several unnecessary steps that had heretofore constrai..

The Levelness of Dyeings from Reused Direct Dyebaths.

Although dyebaths for direct dyes are prime candidates for reuse, salt present in the recycled dyebath hampers the slow addition of salt during the dyeing process. Level dyeing of Class B and Class C direct dyes is especially difficult in the presence of salt. Researchers added dye to a salt containing bath at either the beginning of the ..

Dyeing of Polypropylene With Some Azo Dyes of Basic Character Via Chlorination Route.

After chlorination by sodium hypochlorite, researchers dyed polypropylene fabric with 12 azo disperse dyes in both alkaline and acidic media. Researchers observed a higher dye affinity to chlorinated polypropylene than to unmodified polypropylene. The extent of affinity depended largely on the nature of the substituents in the dyes and on..