Pretreatment

Desizing and bleach cleanup are critical pretreatment steps to ensuring successful fabric dyeing and quality retention.

Desizing

Starch size, a coating used to strengthen and protect warp yarns during industrial weaving, must be completely removed prior to bleaching and dyeing or printing. This desizing step is critical to ensuring an even and consistent fabric finish.

Desizing with Genencor’s amylase enzymes is much more effective, cost efficient, and eco-friendly for manufacturers than chemical desizing methods, such as treatment with acids, hot alkali, or oxidizing agents.

Bleach cleanup

After fabric or yarn bleaching, residues of hydrogen peroxide are left in the bath, and need to be completely removed prior to the dyeing process, using a step called bleach cleanup. Incomplete peroxide removal results in poor dyeing with distinct change of color shade and intensity, as well as patchy, inconsistent dye distribution.