Physical and chemical description. Amorphous and crystalline regions. Heat setting and its influence on dyeing. Barre, oligomers.
Definitions and properties. Influence on dyeing.
Classification Of Disperse Dyes
Dyeing of Secondary Acetate and Triacetate Fibres
Dyeing of Polyester
High Temperature and atmospheric dyeing methods. Carriers. Dye selection and influence on fastness. Thermal migration and sublimation. Rapid dyeing methods. Effect of pH, metal and reduction sensitivity of disperse dyes. Thermosol dyeing. Levelling and stripping of faulty dyeings.
Physical and chemical description. Glass transition temperature.
High Bulk Acrylics
Production and dyeing.
Dyestuffs for Acrylic Fibres
Disperse. cationic, K values, s and f factors. Recipe calculations.
Dyeing Methods for Acrylics
The use of retarders and migration auxiliaries.
Dyeing of wet-spun acrylic.
Dyeing of Blends
Reasons for use of blends.
Applications of disperse/reactive, disperse/vat, disperse/direct mixtures. Batch, pad-batch and continuous methods.
Application of disperse and selected classes of acid and reactive dyes. Protecting wool during dyeing.
Application of acid and reactive dyes.
Blends with cotton, polyamide and polyester. Choice of suitable dyestuffs.
Construction of Dyeing Machinery
Loose stock, tow, yarn. fabric and garment dyeing machinery.
Fabric Dyeing Machinery
Winches, jet, soft flow, beams. Elements of the dyeing machine i.e. fabric transport, heat exchanger.
General de-watering processes.
Infra Red, Radio Frequency, stenter and can drying.
Visual and computer matching techniques.
An overview of the increasing restraints on pollution from the dyehouse.