The effect of spinning parameters on friction spun core yarns tensile properties [Utjecaj parametara predenja na vlacna svojstva prede s jezgrom izradene frikcijskim predenjem]

Polyester staple fiber core/polyester staple fiber sheath and polyester staple fiber core/viscose staple fiber sheath DREF-3 core yarns are produced using different spinning parameters in order to explain the impact of these parameters on DREF-3 yarn tensile properties. Core yarns of 65 tex linear density are produced using three different core/sheath ratio levels, four different spinning drum speeds, three different air suction pressures at 4200 rpm constant opening roller speed and 100 m/min constant production speed. Tensile properties of the yarns are tested and the obtained results are evaluated using regression analysis with the SPSS statistical program at 0.05 significance level. Higher core/sheath ratio reduces both yarn tenacity and elongation ratio. The increase of spinning drum speed lowers core yarn tenacity; however, it does not have a significant effect on the elongation ratio. At higher air suction pressure, the PES/viscose yarn tenacity and elongation ratio rise. On the other hand, it has no significant impact on the tensile properties of PES/PES yarns.