Different Treatments to the Fabric

Different Treatments to the Fabric:

• Desizing
• Scouring
• Bleaching

Desizing

• Desizing is a process by which fatty matters are removed from the grey cloth i.e. starch etc., which applied to the warp and weft yarns during weaving in order to with stand the stress or strain.

• Process of desizing can be done either by hydrolytic desizing or by oxidative desizing.

• The theme of desizing process is only to convert the insoluble starch into soluble form. Starch can be hydrolyzed under the following steps:

• Starch→ Dextrin → Dextrin → Maltose → Glucose

• (Insoluble)(Insoluble) (Soluble)(Soluble)(Soluble)

Scouring

• Scouring is the process by which oils, fats, waxes and other nitrogenous matters are removed. Process is carried out by adding 2g/l caustic soda, 1g/l soda ash and 1 g/l T.R.O. and then the temperature is raised to boil and process continued for 3‐4 hours under the pH 10‐11.5.

Bleaching

• A method of bleaching, the fabric is rinsed and struck against a stone, so as to remove as much of the sizing as possible. It is then spread out for sun bleaching and drying, water is sprinkled over the cloth at short intervals until evening. Then it is finally washed and dried.