Browsing by Author "Paraňová, Zuzana"
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- ItemOptimalizace vlastností vícenásobných skaných přízíParaňová, Zuzana
- ItemOptimalizace vlastností vícenásobných skaných přízí(Technická Univerzita v Liberci, 2011) Paraňová, Zuzana; Ursíny, PetrThis diploma thesis deals with examining the impact plied twist, fineness, and the number of single yarns in the yarn twisted on the deformation properties and mass unevenness ply yarn. The theoretical part is devoted to an overview the basic parameters of yarns, fineness, twist and mass unevenness, mechanical and deformation properties, such as. strength, elongation and cyclic stresses. The experimental part is focused on a set of yarns produced by two for one twisting technology in the company Hoflana Liberec - Machnín s.r.o. For simple and plied yarns was carried out measuring strength, elongation and cyclic stress on the device Instron 4411, carried out measuring the mass unevenness on the device Uster Tester IV - SX and after mathematical - statistical processing of measured data. Mass unevenness is assessed on the basis of DR curves where compared the impact of doubling. In conclusion, the experimental part was carried out to assess the effect plied twist, fineness and number of single yarns in the ply yarn on the observed properties of twisted yarn and to determine their optimal level in terms of deformation properties and mass unevenness of plied yarn.