Textile Learners Information Blog
Sequence of Dyeing:
This dyeing process is developed by Du Pont Corporation in 1949. here at sufficient temperature the fibres are soften and their internal structure is opened, polymer macromolecules vibrates vigorously and dye molecules diffuse in in fibre. It requires only a few seconds to 1 min and temperature about 200-230°C. The sequence of operation is:
Ø At first the fabric is padded with dye solution using above recipe in a three bowl padding mangle.
Ø Then the fabric is dried at 100°C temperature in dryer. For dyeing, infra red drying method is an ideal method by which water is evaporated from fabric in vapor form. This eliminates the migration of dye particles.
Ø Then the fabric is passed through thermasol unit where thermo fixing is done at about 205°C temp for 60-90 seconds depending on type of fibre, dye and depth of shade. In thermasol process about 75-90% dye is fixed on fabric.
Ø After thermo fixing the unfixed dyes are washed off along with thickener and other chemicals by warm water. Then soap wash or reduction cleaning is done if required.
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