Processing Sequence
Removal of protective coatings from warp yarns prepares a woven fabric for subsequent wet processing steps. A desizing protocol specifies the exact temperature and chemical concentration needed to dissolve starch or synthetic sizes. This procedure is the first stage of finishing after the cloth leaves the loom.
Successful execution ensures that dyes and finishes can penetrate the fiber core.
Enzyme Treatment
Biological catalysts break down natural starches into water soluble sugars without damaging the cotton fibers. Following a desizing protocol involving amylase requires precise control of the bath temperature to avoid denaturing the enzyme. This method is preferred for its environmental profile and efficiency.
It leaves the fabric soft and absorbent.
Efficiency Audit
Visual inspections and chemical tests confirm the total removal of the sizing agent. The desizing protocol is verified using a tegewa scale or a drop of iodine to check for residual starch. If purple spots appear, the process must be repeated or adjusted.
Uniformity here prevents splotchy dyeing later.
Downstream Reliability
Consistent preparation creates a stable base for the bleach and dye stages. An incomplete desizing protocol causes resisted areas where color cannot bond with the yarn. This leads to costly reworks or the rejection of finished goods.
The protocol must adapt to the specific size used in the weaving mill.
