Original scientific paper
Unevenness of air-jet spun yarn comparison with ring and rotor spun yarn made from micro modal fibers
Zenun Skenderi
; University of Zagreb, Faculty of Textile Technology, Zagreb, Croatia
Dragana Kopitar
orcid.org/0000-0003-4895-2548
; University of Zagreb, Faculty of Textile Technology, Zagreb, Croatia
Zlatko Vrljičak
; University of Zagreb, Faculty of Textile Technology, Zagreb, Croatia
Goran Iveković
; Predionica Klanjec d.o.o., Klanjec, Croatia
Abstract
All unevenness parameters (overall unevenness, unevenness on different cut lengths of 1 m, 3 m and 10 m and hairiness) of the air-jet yarn produced from micro modal fibers spun on the J20 air jet machine using the unevenness parameters of the rotor spun and conventional ring spun yarn produced form the same fibers were compared. In order to reduce the number of input influencing parameters on the unevenness properties, the comparison was performed on yarns for the same end-use (knitting) and with an equal count of 20 tex (Nm 50). Assuming that the mass distribution in the yarns follows a normal (Gauss) curve a t-test of yarn unevenness was carried out. It was shown that the overall unevenness of the air-jet-spun yarn is smaller than that of the rotor spun yarn and is greater than the unevenness of the conventional ring spun yarn, while over larger cut lengths (1 m, 3 m and 10 m) it is smaller than in both yarns, rotor and ring spun yarns. The number of thin places in air-jet-spun yarns at a sensitivity level -30% is higher than the number of these faults in the ring spun yarn by 9.2 times and compared with the rotor spun yarn lower by 4.2%. The air-jet-spun yarn at a sensitivity level +50 % has the smallest number of thick places. In terms of hairiness, the air-jet-spun yarn has a relatively higher quality.
Keywords
air-jet yarn; yarn unevenness; yarn faults; yarn hairiness; micro modal fibers
Hrčak ID:
220226
URI
Publication date:
5.9.2018.
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