engleski

APPLICATION OF STARCH-ACRYLAMIDE COPOLYMER IN THE PROCESS OF COTTON YARNS SIZING

Cotton yarns are sized with a strengthening adhesive-like material (usually starch or a starch-based material), to prevent damage during the weaving process. Size is usually applied to the warp yarns, particularly susceptible to mechanical strains during weaving. In this work a newly tailored polymeric starch-derived products from potato are applied in sizing of rotor spun cotton yarns with linear density of30 tex. Testing the suitability of these polymeric matedals as sizing agent of cotton yarns was also done. With the increase of the starch concentration to a certain value, the starch adds-on the yarns almost proportionally increased and then decreased with further increase of concentration. Higher or lower concentration~ of starch do not increase proportionally starch add-on, so the concentration of I 0 % could be "ideal" for yarn sizing. The concentration of 20 % gives a slightly higher add- on than that obtained with 10% active substance. Tensile strength at break depends on treatment conditions, and it increased with the increase of the concentration ·of sizes. Therefore, tensile strength depends directly on the quantity of applied starch. Moreover, it was found that elongation at break also increased with the increase of the concentration of active components, though slightly lower, indicating that higher values of breaking strength may be due to higher additional elasticity of yams. An expected appropriate shrinking· percentage appeared, depending on starch type and concentration, related to relaxation of stretched ends and swelling tendency. Increase of starch concentration as well as type of starch caused an increase of shrinking percentage. Finally, it seems that the treatment with grafted potato starch shows good results regarding side and achieved effects. Additional investigations, as are other procedures, treatment conditions, new agents, may contribute in improving treatment effects relating to process shortening and simplification.

starch; acrylamide; grafting; sizing; yarn; tensile strength; elongation at break.

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