Desizing
In the textile industry, desizing or desizing refers to the removal of the protective film from the warp threads of a woven textile.
Finishing
Before the weaving process , a protective film, the so-called size , is applied to strengthen the warp threads . As sizing agents are starch (often in oxidatively more open form), starch (carboxymethyl starch), higher alcohols , polyvinyl alcohol , acrylic acid (and their salts) or cellulose derivatives (eg. B. carboxymethyl cellulose ) are used.
Desizing
The fabrics treated with sizes are usually freed from the sizes (desized) after weaving and before further processing. Various methods are used for this.
Methods of desizing:
- hydrolytic : with acids
- oxidative : with persulfates
- enzymatic : for starch sizes
- thermal: for glass fibers
- mechanical: for water-soluble sizes, by washing with hot water
The aim of the desizing process is, on the one hand, to eliminate the hard feel and, on the other hand, to improve the net and through-dyeing behavior of the fabric.
Starch- coated glass fiber fabrics are also thermally or enzymatically desized in order to then apply a silane finish so that resins subsequently bond chemically to the glass.
Colored finishing
Here the sizing agent remains on the goods, which are given a certain finishing effect.