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Poboljšanje metode merenja mehaničkih svojstava teksturirani filament/elastan hibridnih pređa
Towards improving measurement method for mechanical properties of textured filament/elastane hybrid yarns
aUniverzitet u Beogradu, Tehnološko-metalurški fakultet, Srbija + Fulgar East d.o.o., Zrenjanin bFulgar East d.o.o., Zrenjanin cUniverzitet u Beogradu, Tehnološko-metalurški fakultet, Srbija
email: miroslavkalanj@gmail.com, stankovic@tmf.bg.ac.rs
Keywords: prekidna sila; izduženje; teksturirani filament; poliamid; Lycra; hibridna pređa
Ključne reči: tenacity; elongation; textured filament; polyamide; Lycra; hybrid yarn
Abstract
Merenje mehaničkih svojstava hibridnih pređa koje sadrže elastansku komponentu vrlo je komplikovano. Standardni pristup merenju prekidne jačine i istegljivosti ne može se primeniti na ovaj tip pređa. Glavni razlog je velika elastičnost kako elastanskih, tako i teksturiranih filamenata. U okviru ovog istraživanja, rešavanju navedenog problema se pristupilo merenjem mehaničkih svojstava teksturirani filament/elastan hibridnih pređa uz prednaprezanje veće od standardnih vrednosti. U ovom radu je primenjeno nekoliko različitih sila predzatezanja: 1,5 cN, 4,5 cN, 7,5 cN, 10,5 cN, i 13,5 cN. Kao spiralno omotavajući filament korišćen je tekstirirani poliamid 6.6, a za jezgro hibridne pređe upotrebljene su Lycra® elastomerne pređe različitih finoća. Rezultati su pokazali da se sa povećanjem sile predzatezanja, izuduženje poliamid/Lycra® hibridnih pređa smanjuje, uz slabo izražen uticaj sile predzatezanja na vrednosti prekidne jačine ispitivanih hibridnih pređa. Ovakvi rezultati su obećavajući, međutim, metoda se mora dalje razvijati da bi bila generalno primenjiva na sve složene pređe koje sadrže elastanski filament.
Sažetak
The mechanical properties of hybrid yarns containing elastomeric component are rather difficult to measure. A standard approach to measuring tenacity and elongation cannot be applied to this type of yarn. The main reason is the high elasticity of both elastane and textured filaments. An attempt was made in this study to solve the problem by measuring the mechanical properties of textured filament/elastane hybrid yarns under pretension force which is higher than standard ones. Several pretension forces were applied: 1.5 cN, 4.5 cN, 7.5 cN, 10.5 cN and 13.5 cN. Textured polyamide 6.6 was used as a spirally covering filament, while the core yarn was LYCRA® elastomeric yarn with various linear densities. The results indicated that with an increase in the pretension force, the elongation of the polyamide/ LYCRA® hybrid yarns decreased whereas, the pretension forces had little effect on the tenacity values for investigated samples. These preliminary results are promising, however, the method must be further developed to be ultimately applicable to all complex yarns containing elastomer filament.
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