Wet and Dry Processing of Cotton 0.0 / 5 ? TextilesColoration Preparatory StepsUniversityNone Created by: hdobbieCreated on: 02-01-16 23:42 (pre-weaving) Sizing Application of starch or polymers to stabilise warp yarns to reduce breakages. 1 of 6 Singeing Mechanical. Improves wettability by burning off surface fibres. 2 of 6 Desizing Removal of size material using α-amylase or oxidative chemicals. 3 of 6 Scouring Removal of natural and added impurities by various processes depending on cotton type. 4 of 6 Bleaching Oxidation or reduction of the yellow chromaphores in cotton. Typical bleaching agents: hydrogen peroxide, sodium chlorite, sodium hyphochlorite. 5 of 6 Mercerisation Changing the shape of the cotton fibre (swelling) by impregnating with ~22% sodium hydroxide solution. 6 of 6
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