It is necessary to carry out some preparatory treatments before the application of other finishing processes to the newly constructed fabric. Any remaining impurities and additives used to facilitate the manufacturing process must also be removed.
Disperse dyes are water insoluble non-ionic dyes used to dye man-made fibres from acidic bath, specially designed for dyeing of polyester and are applied along with dispersing agent to retain dyes in fine dispersion.
In the polyester dyeing process, various auxiliaries such as dispersants and levelling agents for level dyeing, reduction clearing agents for washing off unfixed dyes and for improving dye fastness, and buffers are used.
The role of the textile finisher has become increasingly demanding, and now requires a careful balance between the compatibility of different finishing products and the application processes used to provide textiles with desirable properties.