Causes of stripiness on polyester textiles during dyeing

The effect of fibre fine structure on stripiness in the dyeing of polyester fabrics is considered. Ways of eliminating stripiness are discussed, eg by using suitable levelling agents and/or dyes with good migrating properties.

pH and buffer systems in dyeing

The use of buffers such as sodium acetate and acetic acid to stabilize pH levels during dyeing is discussed. The action of buffers is explained and reproducibility problems with disperse dyes are considered. Sandoz's Sandacid PBI and its use as an acid buffer stabilizing pH in the weakly acid region are described briefly.

Process analysis and development of a test dyeing method for recipe calculating in the cold-dwell pad-batch dyeing of cotton fabrics with reactive dyes (AIF-No. 7997)

The aim of this research project was to analyse individual stages in the cold pad-batc dyeing process and so improve the conversion of laboratory dyeings into practical dyeing procedures.

Influence of direct dye structure on coverage of immatrue cotton fibre neps. [II]

For part I see abstract 93W/02617.

Influence of direct dye structure on coverage of immatrue cotton fibre neps. [I]

This is the first half of an article concemed with the correlation between direct dye structure and nep coverage in dyeing. Nep coverage ability of the nineteen direct dyes tested appears to be governed by molecular weight of the dye and the total number of hydrogen bond-forming groups present in the dye molecule. A multiple regression an..

Dyestuffs of the ancients

The histories of the eight most important natural dyes are related. The dyes in question are: cochineal, Tyrian purple, madder, indigo, saffron, safflower, woad and logwood. A further twelve commonly-used natural dyestuffs are briefly described.

[Cotton. II] 'Quick response' processing

Ways of finishing cotton garments and fabric to meet changing consumer demands are highlighted. They include finishing with enzymes, flame-resistnat treatments, stabilizing cotton knits and new ways for easy-care finishing. For the first part of this cotton series see abstract 93W/00520.

Influence of organic solvents on the dyeing, felting, elasticity and swelling of wool. [II]

For part I see abstract 93W/01378. This instalment covers the felting trials, elastic behaviour and swelling measurements. Solvent systems with acetic acid, formic acid and alchols are studied together with the influence of water content.

Textile wet processing and the environment

In the wet processing sector progress has been made towards better environmental practice. The wet processor is able to minimize his efflent problems by adopting three main approaches: reducing the volume and toxicity of his discharges; recycling and reusing useful constitutents: adopting alternative 'greener' chemicals and processing met..

Removal of surfactants from effluents using mineral absorbers

The use of bentonite clays as absorbers for the treatment of dyeing/finishing effluents is investigated.