By John Shore
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Additional info for Blends Dyeing
The acid-dyeable component cannot be reserved because of disperse dye staining, but good reserve of the ester fibre is attainable. Colour contrasts are limited because of the dulling effect of the disperse dye on the acid-dyeable fibre. The attainment of contrast or reserve effects by differential dyeing is the main justification for DB blends, which contain an ester fibre with an acrylic or other basic-dyeable copolymer. The basic-dyeable component cannot be reserved satisfactorily, but good reserve of the ester fibre is possible.
The AA blends, based mainly on nylon and the protein fibres, are particularly important in knitting and carpet yarns. Physical properties usually provide the main justification for developing these blends, which are often blended-staple yarns. Solid dyeings are therefore most important and not too difficult to obtain because preferential uptake by nylon in pale depths can be controlled using reserving agents. 3 Colour effects attainable on binary blends Colour effect Blend type (example) Solid Reserve Shadow Contrast AA (nylon/wool) Use of auxiliaries Neither component Easily controlled Not possible AB (nylon/acrylic) Easily controlled Acrylic reserve Seldom required Wide range available AC (nylon/cellulosic) Easily controlled Cellulosic reserve Seldom required Wide range available CB (cellulosic/acrylic) Easily controlled Either component Seldom required Wide range available CC (cotton/viscose) Dyeing conditions Neither component Viscose deeper Not possible DA (polyester/wool) Dyeing conditions Polyester reserve Seldom required Limited range DB (polyester/acrylic) Easily controlled Polyester reserve Acrylic deeper Limited range DC (polyester/cellulosic) Easily controlled Either component Seldom required Wide range available DD (triacetate/polyester) Dyeing conditions Polyester reserve Easily controlled Not possible suited to shadow effects because one class of dyes can be used for both components.
The highly alkaline reducing conditions of a vat dyebath are even more extreme. One-bath methods generally are thus excluded and only a twobath sequence can be considered. 3 INTERACTION BETWEEN ANIONIC DYES AND BASIC DYES The range of bright colour contrasts is much wider on AB blends than on all other types of binary blend because the fibres carry opposite charges and ionic dyes are much more selective than disperse dyes. The opposite charges carried by the dyes, however, lead to incompatibility in one-bath dyeing.
Blends Dyeing by John Shore