A series on dyeing. Chapter 6: Azoic combinations: chemical principles

The differences between azo and azoic colours are explained as is the general chemistry of diazotization and coupling. This is followed by an account of the introduction into dyehouses of azoic combinations, in the form of azoic couplers and azoic diazo components, as fast colour bases and salts. For previous instalment see abstract 92W/0..

Sample dyeing machine for articles with a delicate surface

The Thenflow OF HT sample dyeing machine can be fitted with an oveflow or jet system and is intended for finishing of articles with a delicate surface such as gabardines of pure wool or wool blends.

Sample jigger

The BTRA has developed a new automated laboratory jigger for sample dyeing, shade matching in conjunction with computer colour matching, dye standardization, textile auxiliary testing and general research.

Scholl: ultra-short liquor piece-dyeing machine

The ultra-short liquor piece-dyeing machine, Colorstar, from Scholl is a modified version of the twelve-year-old Subtilo model. The capacity has been increased by 80％ giving better cost-effectiveness.

The transfer of laboratory dyeings in batchwise dyeing processes

Corrections in production dyeing are so costly that, as a rule, extra laboratory work is justified in order to be able to transfer recipes from the laboratory to bulk with greater reliability. Some sources of error and important factors in recipe transfer are discussed. The accuracy of working procedures must be checked. ,Non-sensitive an..

Relationship between cellulase treatment and direct dye dyeing for cotton

Equilibrium dye uptake of Congo Red by cotton fabric previously treated with cellulase was measured and the relative volume term of dyeing was obtained in connection with weight loss. As a result, it was assumed that cellulase-catalysed hydrolysis would occur mainly in the amorphous region at smaller weight loss. In addition, fabrics prev..

Dyeing: from silk to microfibres

The Midlands Region of the Society of Dyers and Colourists, UK, recently organized a symposium on developments in dyeing. Papers presented are reviewed. Topics included the dyeing and finishing of fabrics containing Lycra elastane fibres, the dyeing of microfibres (polyester and nylon), and the dyeing of silk.

Recent developments in dyeing theory and practice

Papers presented at a conference organized by the department of colour chemistry and dyeing, University of Leeds, UK, on recent developments in dyeing theory and practice are reviewed.

Solvent-assisted dyeing of polyester fibres

Polyester fibre was pretreated with nitrobenzene and aniline at different temperatures for an optimum time, followed by dyieng with disperse dyes at temperatures ranging from 70 to 100℃. The effect of these pretreatments on the physical properties of the fibre, namely swelling, moisture regain, tenacity and elongation at break was also a..

Dyeing behaviour of viscose and modal fibres compared with that of cotton

From the sorption behaviour of individual dyes on homogeneous substrates, characteristic constants can be derived which allow computation of the sorption behaviour of combinations of these dyes on mixed substrates. The ideas on which these calculations are based are discussed and their practical application is demonstrated with examples d..