20.500.12556/RUL-134230 Determination of optimum twist equation for the long staple combed cotton ring-spun yarn The aim of this research was to determine the optimum twist equation for ring-spun yarns. The yarn twist can be calculated by different equations. With the research, we tried to find the appropriate equation to determine the yarn twist, which is determined by the values of yarn strength and hairiness. In the research, yarns from long staple combed cotton rovings and of different fineness (10 tex, 11.8 tex, 20 tex and 29.4 tex) were analyzed. The yarn twist was calculated using the equations of Koechlin and Laetsch. The analyzed yarns were produced in the spinning mill on the laboratory ring spinning machine Spinntester. In the second part of the investigation, yarn strength and hairiness were analyzed as a function of yarn twist. The results showed that Laetsch’s equation is suitable for determining the twist for yarns with a fineness of 10 tex, 11.8 tex, 20 tex and 29.4 tex, since, in this case, the calculated number of yarn threads is higher and thus the strength and elongation at break are also higher. The yarn hairiness is higher in analyzed samples for yarns with the twist calculated according to the Koechlin’s equation. ring-spun yarn Koechlin's equation Laetsch's equation twist evenness strength hairiness prstanska preja Koechlinova enačba Laetschova enačba vitje preje enakomernost preje trdnost preje lasavost preje true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-03 10:19:01 2022-01-03 10:19:03 2022-09-13 03:54:03 0000-00-00 00:00:00 2020 0 0 17 str. iss. 9, art. 59 Vol. 8 21 Sep. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 677 2079-6439 10.3390/fib8090059 29203971 RAZ_Sajn_Gorjanc_Dunja_2020.pdf RAZ_Sajn_Gorjanc_Dunja_2020.pdf 1 187BB54C0024DDBB6DE17D774217D2C6 b19d89ccf3f7759b710d6881dbedeefd10148f6b645ccf360fbdc00aa2adda90 5c74217d-6c76-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152576 https://www.mdpi.com/2079-6439/8/9/59 1 07804692-6c76-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152575 Naravoslovnotehniška fakulteta 0 0 0