Flame heating fabrics prior to steaming - as preheating during dye fixing

摘要

Flames are directed on wetted textile prior to its entry to a steaming chamber for dyestuff fixing. The water on the textile is raised to near its b.pt. Condensn. on the fabric during dyeing is avoided. Washing out of the fibre tips is thus reduced, dyed areas have a more distinct outline and residence times in the steamer are reduced. Pref. the flame is produced by gas jets arranged to spread the flame over the whole fabric width. The water in the fabric is raised to within 5 degrees C of b.pt. The water content in the fabric can be =50%. Steaming can be conducted at 102-140 degrees C. Dyeing can be conducted as a one or two phase fixing/dyeing process, e.g. with vat, sulphur or reactive dyes.