Reuse of Spent Dyebath Following Decolorisation with Ozone

Reactive dyes cause more effluent problems than other dye classes due to their low fixation on cotton and extensive use. An experiment reused recycled reactive dyebaths decolored via ozonation for bleaching, whitening , and dyeing cotton and polyester fabrics. Reuse required small modifications to conventional processes for dyeing cotton ..

Processing of knit fabrics

Clearer understanding recently of structural and mechanical features has evolved machines and specific processes for dyeing and finishing knitted fabric. Machinery related aspects of dyeing and recent development in soft dyeing technique are examined. Knitted fabrics and their characteristics are discussed. Knitted fabric is usually dyed ..

Highlights of processing machinery-XIV

Number 14 in this series deals with dyeing machinery of many types from several countries and starts with sample dyeing machinery. These machines in general reproduce the characteristics of production models and can be scaled up simply to provide full-scale production variants. However sample machines themselves may actually be used as pr..

The textile roller-coaster

The focus here is on the manufacturers of dyes and chemicals and the author singles out DyStar and Ciba’s new dyes and chemicals business as global leaders in this field. Other major players mentioned include Clariant and Yorkshire Group and BASF’s chemicals business. Major technical progress and research and development is said to be i..

How the industry is benefiting from membrane technology

The popularity of membrane filtration is growing in dye manufacturing processes. This paper discusses the particular benefits for this industry and outlines several applications. The main application of membrane technology is in dye desalting and concentration of the finished product. It is also effective in recovering material from waste..

Non-eco-friendly textile processing

There are some topics in textile processing taught in degree, diploma and other textile-related courses in India and abroad and are considered very important academically. There was a time, when most of these were important industrially also. However, when the eco-friendly concept has become more and more widespread and government and pri..

Studies on dyeing behaviour of modified polyester with basic dyes

The effect of vinyl graft copolymerisation of itaconic acid onto polyester substrate have been studied to obtain optimum conditions that improve the dyeability of commercial basic dyes. A suitable swelling agent treatment has been given to polyester with N, N’-Dimethyl formamide with a view to achieve maximum graft yield. The grafting of..

Resist dye patterning

The various resist techniques evident in the dyeing of West African cotton cloth are studied. A thick starch paste coating, freehand painting or stencil/stamp application form the main methods. Areas of the cloth can be closely stitched to prevent dye penetration, patterns can e made from small objects tied into the cloth, it can be tied ..

Semiconductor assisted photodegradation of textile dye

The degradation of commonly used textile dye reactive red 2 in an aqueous solution by means of photocatalysis using ZnO in the form of slurry is studied. The influence of initial concentration of the dye, pH of the reaction mixture, catalyst loading, the presence of oxygen, hydrogen peroxide, and potassium persulphate on the degradation r..

Examination of chemical kinetics of wool fibre-acid dye systems in the presence of some surfactans (Serbian) (Istrazivanje hemijske kinetike sistema vuneno vlakno-kisela boja u prisustvu nekih povrsinski aktivnih materija)

In wool fibre-anion dye dyeing systems, the bath composition often comprises various auxiliary agents depending on the kind of dye and the form of dyed wool material. Surfactants-tensides are the basic components in the composition of most auxiliary agents. Levelling agents of various compositions have the most widespread application. The..