Cotton desizing

Enzymatic methods Many research organizations and scientists are working to improve the environment-friendly processing of cotton fabrics with enzymes. The many enzymes are today available for the removal of Impurities in the cotton fibers. For example, alpha amylase is enzyme used for cotton desizing process, pectlnase for pectin removal in cotton fiber and lipase, and protease for fatty substance removal in the cotton fiber treatments. Typical textile wet processing of cotton materials is shown in Fig. 4.6. 

Eeitkenhauer, H., and Meyer, U. (2003). Anaerobic microbial cultures In cotton desizing—Efficient combination of fabric and waste water. Text. Res. 1.73(2X93-97. 

Uses Low foaming detergent for laundry, sanitizers, carpet cleaners, acid pickling of metals wetter for cotton desIzIng, general finishing, dyeing aid Properties Liq. 100% cone. 

The choice and combinations of different size components must take account of many factors if optimum results are to be obtained. Much has been published regarding the optimisation of size formulations in relation to desizing processes [177-183]. Cotton warp yarns sized with starch are normally woven at high humidity (80% and above) to keep yarn breakages low, as the starch film is brittle at low humidity. It has been shown [183], however, that improved weavability at moderate relative humidity (e.g. 65%) can be obtained using (a) starch/acrylamide or hydroxyethyl starch at not less than 15% add-on or (b) poly(vinyl alcohol), which gave excellent results even at a low add-on of 5-6%. 

Addition of acrylamide to starch improved the performance of cotton yarn more than acrylamide alone, but addition of poly(vinyl alcohol) to starch lowered the performance of the yarn compared with poly(vinyl alcohol) alone. Overall, taking into account economic considerations, stringent pollution requirements and the needs of desizing, the singlecomponent hydroxyethyl starch showed optimum acceptability for weaving performance at moderate relative humidity. 

Table 10.22 Effect of desize and boil-off of cotton on AOX and whiteness values before and after chlorite bleaching [224]... 

FIGURE 5.9 Molecular weight distribution for cotton printcloth, desized, scoured, and bleached. 

Samples and duplicate samples of unbleached desized cotton print cloth (400 V test fabrics), 80 X 80 count, 3.5 oz/yd2, and yarn size of 40 singles in warp and weft, were randomly selected after conditioning to 55% rh in a desiccator over potassium dichromate solution. The samples were placed inside the pharmacy bottles along the flat sides so that each bottle contained one sample and one duplicate. When the samples were placed side by side along the flat side of the bottle chambers, they filled the entire flat-sided area. Dark chambers were achieved by wrapping the bottles in aluminum foil to exclude light. 

One bath desize-scour-bleach for cotton and blends produces superior whites and softer hand in conjunction with STABILIZER DZ. 

Anionic/solvent detergent for use in alkaline scouring and bleaching of cotton for removal of oils and waxes. Effective in enzyme desizing. 

Proprietary bleach. Desizes, scours and bleaches simultaneously. Used on cottons, rayons and heavily oiled fabrics such as those containing spandex fiber. Compatible with caustic and does not require solvents in scouring. 

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