Protective Coating
Formulated sizing mixtures used in modern textile mills combine the cost advantages of natural starch with the high elasticity of synthetic polymers. The starch synthetic hybrid film coats the delicate flax fibers to shield them from high mechanical forces during weaving. This composite layer provides a balanced barrier that is both adhesive and flexible.
Elastic Balance
Balancing the ratio of potato starch to polyvinyl alcohol governs the physical characteristics of the dry size layer. When weavers apply a starch synthetic hybrid film, they achieve a higher elongation at break than is possible with pure starch. This added elasticity allows the warp yarns to stretch repeatedly under heald frame movements without cracking the protective sheath.
The synthetic component also helps the film retain its integrity in highly humid loomsheds where pure starch would soften too much and lose its protective value.
Finishing Separation
Desizing processes at the finishing mill must dissolve the hybrid polymer matrix before the linen fabric can be dyed. Because the starch synthetic hybrid film contains both water-soluble starch and synthetic elements, it requires specific hot-wash sequences. These industrial washes must be carefully controlled to ensure no residue remains to block the dye molecules.
