INFLUENCE OF THE TEXTILE MANUFACTURING PROCESS ON THE ACRYLIC FIBER MICROSTRUCTURE

The evolution of the mechanical properties and the differential solubi lity in DMF/W 95/5 of VONNEL acrylic fibres according to the textile m anufacturing process has been studied. Short staple fibres of 1.3 dtex for rotor spinning and long staple fibres of 3.3 dtex for ring spinni ng were considered. Bearing in mind that textile processing includes m echanical processes as spinning and weaving, and thermochemical proces ses as spinning and weaving, and thermochemical processes as vaporizin g and dyeing, acrylic fibres were submitted to the three following pro cesses: spinning, vaporizing or steaming, and dyeing. The 1.3 dtex fib res were spun using the rot or spinning process, while the 3.3 dtex fi bres were spun using the worsted spinning system. The mechanical prope rties as tenacity, breaking elongation and specific work of rupture. a nd the differential solubility at different temperatures were determin ed on raw, spun, steamed and dyed fibres. It has been shown that the e ffect of the spinning process on differential solubility is similar to the effect of a dry thermal treatment, while the effect of the steami ng and dyeing produces the opposite effect like a wet thermal treatmen t. When mechanical stressing is induced on fibres, changes on mechanic al properties are observed, while in absence of mechanical stressing o nly very felt, changes on mechanical properties can be attributed to w et thermal treatments.