SADFA 3 Dyeing Technology (Synthetic Fibres)


Polyester Fibres

Physical and chemical description. Amorphous and crystalline regions. Heat setting and its influence on dyeing. Barre, oligomers.

Polyester Microfibrers

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.

Acrylic Fibres

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.

Neochrome Process

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.

Lycra Blends

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.

Hydro Extraction

General de-watering processes.

Drying Machinery

Infra Red, Radio Frequency, stenter and can drying.

Colour Matching

Visual and computer matching techniques.


An overview of the increasing restraints on pollution from the dyehouse.