THE EFFECT OF DYEING ON THE HYGRAL EXPANSION OF WORSTED FABRICS .3. REACTIVE DYEING

The influence of different types of reactive dye on fabric set and hyg ral expansion is detailed. Lanasol (alpha-bromoacrylamide) reactive dy es were found to inhibit the development of set during dyeing, resulti ng in lower dimensional instability. The low hygral expansion is attri butable to set inhibition by the fibre reactive group and to water exc lusion by the presence of dye molecules. An alkaline aftertreatment is shown to result in increased fabric set and dimensional instability.