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Properties Of Viscose Vortex Yarns Depending On Technological Parameters Of Spinning

Moučková E., Mertová I., Jirásková P., Krupincová G., Křemenáková D.

Autex Research Journal

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2015

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Vol. 15, no. 2

138--147

EN

This paper analyzes the relationship between technological parameters of spinning of 100% CV Vortex yarns of different counts and its selected geometrical parameters (a lead of helix of wrapping fibre ribbon, yarn diameter) as well as yarn properties. The number of twist of wrapping fibre layer is determined. The effect of the yarn delivery speed, hollow spindle diameter, and the main draft on the hairiness, mass irregularity, tenacity, elongation, resistance to abrasion and bending rigidity of Vortex yarn is observed. The yarn properties are compared with the properties of open-end rotor spun yarns. Slivers of the same spinning lot were used for the production of both kinds of yarn. The results showed that the delivery speed in combination with spindle diameter affects yarn diameter, hairiness and abrasion resistance. Mass irregularity and imperfections of yarn is mainly affected by the main draft of drafting unit. Technological parameters of spinning do not affect the level of bending rigidity of the Vortex yarn. Tested rotor spun yarns had a larger diameter, higher hairiness, lower tenacity and higher elongation, lower mass irregularity and number of imperfections, higher abrasion resistance and lower bending rigidity compared to tested Vortex spun yarns.

2

A Comparative Study of Hooks in the Yarns Produced by Different Spinning Technologies

Ghosh A., Das S., Mal P.

Autex Research Journal

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2015

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Vol. 15, no. 4

260--265

EN

This article presents a comparative study of hooks’ characteristics of ring, rotor, air-jet and open-end friction spun yarns. Hook types and their extent, spinning in-coefficient and mean fibre extent in the yarns produced on different spinning technologies are investigated. The results show that the hook extents for open-end friction spun yarn are the highest followed by rotor, ring and air-jet spun yarns. Ring and air-jet spun yarns have higher percentage and extent of trailing hook as compared with leading hook, whereas, rotor and friction spun yarns show the reverse trend.

3

A quick, reliable, and economic method for evaluating the properties of rotor-spun yarn

Das D., Ishtiaque S. M., Mac T., Veit D., Gries T.

Autex Research Journal

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2004

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Vol. 4, no. 3

123--128

EN

An attempt has been made to evaluate the primary and secondary properties of blended rotor-spun yarn both quickly and reliably from only a small sample of fibre. The concept of the quickspin system of yarn production is partially utilised in this research work. The natural and synthetic fibres are blended in a 50/50 ratio according to five different methods on an Uster Micro Dust and Trash Analyser 3 (MDTA 3), and the best blending method is evaluated with the help of a suitable image analysis technique. Furthermore, the reliability of rotor-spun yarns produced from MDTA 3 slivers with conventionally produced rotor-spun yarns from card and draw-frame slivers has been checked in terms of their properties.

4

Investigating and Modelling Yarn Parameters for Different Feeding Slivers

Jackowski T., Chylewska B., Cyniak D., Jackowska-Strumiłło L.

Fibres & Textiles in Eastern Europe

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2002

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Vol. 8, no. 1 (36)

49--51

EN

The influence of linear density of the feeding sliver and linear density of rotor yarn on the parameters such as the coefficient of yarn mass variation, tenacity and yarn faults has been investigated. Experimental work was carried out on the BD 200S rotor spinning machine using the following parameters: rotational speed of the rotor: 50,000 revs/min (833 revs/s); m opening roller speed - 7,000 revs/min (116.7 revs/s); m linear density of yarn -18; 20; 25; 30; 35 and 40 ktex. The spinning machine was fed with a second-passage drawframe sliver: 2.5; 3.0; 3.5; 4.0; 4.5 and 5.0 ktex. The partial hybrid model considering the influence of yarn and sliver linear densities for the coefficient of yarn mass variation CVm is presented. The sliver linear densityms and CVT are introduced to the inputs of the artificial neural network (ANN), which determines the real value of the coefficient of yarn mass variation CVm A small multilayer perceptron network with one hidden layer was applied for the considered problem.

PL

W artykule opisano wpływ masy liniowej taśmy zasilającej i masy liniowej przędzy rotorowej na parametry przędz, takie jak nierównomierność masy liniowej, wytrzymałość właściwą i błędy. Eksperymenty prowadzono na przędzarce BD 200S stosując następujące parametry: prędkość obrotowa rotora: 50.000 obr/min (833 obr/s), m prędkość obrotowa bębenka rozwłókniającego - 7.000 obr/min (116,7 obr/s), m masa liniowa przędzy: 18, 20, 25, 30, 35 i 40 ktex. Przędzarkę zasilano taśmami po drugim pasażu rozciągania o masach liniowych: 2.5; 3.0; 3.5; 4.0; 4.5 i 5.0 ktex. W artykule zaprezentowano cząstkowy model hybrydowy procesu przędzenia, uwzględniający wpływ gęstości liniowych przędzy i taśmy na współczynnik zmienności masy przędzy CVmT są podawane na wejście sztucznej sieci neuronowej, a wartość rzeczywistego współczynnika zmienności masy przędzy CVm

5

Influence of the Spinning Process Parameters on Strength Characteristics of Cotton Yarns

Jackowski T., Chylewska B., Cyniak D.

Fibres & Textiles in Eastern Europe

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2002

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Vol. 8, no. 3 (38)

27--31

EN

In this paper, the strength parameters of cotton yarns formed on the Rieter R1 spinning machine and on the Textima ring spinning machine were analysed. For the rotor spinning machine, the influence of linear density of the feeding sliver and of yarns on their specific strength, elongation and elasticity was evaluated. For the rotor spinning machine, the following parameters were used: rotational speed of the rotor - 100,000 r/min (1666.7 r/s), rotational speed of the opening roller - 7,000 r/min (116.7 r/s), linear density of yarns: 18, 20, 25, 30 tex. The spinning machine was fed with slivers after the second passage of drawing with the linear densities: 3.5, 4.0, 4.5, 5.0 ktex. On the ring spinning machine, yarns of linear densities of 25 and 40 tex were formed from the roving 400 tex. Analysis of the results for rotor-spun and ring-spun yarns showed that rotor-spun yarns are characterised by higher elasticity, which makes them a very good material for knitting purposes.

PL

W artykule analizowano parametry wytrzymałościowe przędz bawełnianych formowanych na przędzarce Rl firmy Rieter i przędzarce obrączkowej firmy Textima. Dla przędzarki rotorowej oceniano wpływ masy liniowej taśmy zasilającej i masy liniowej przędz na ich wytrzymałość właściwą, wydłużenie i sprężystość. Na przędzarce rotorowej stosowano następujące parametry: prędkość obrotowa rotora -100.000 obr/min (1666,7 obr/s), prędkość obrotowa bębenka rozwłókniającego - 7.000 obr/min (116,7 obr/s), masa liniowa przędz: 18; 20; 25; 30 tex. Przędzarkę zasilano taśmami po drugim pasażu rozciągania o masach liniowych: 3,5; 4,0; 4,5 i 5,0 ktex. Na przędzarce obrączkowej formowano przędze 25 i 40 tex z niedoprzędu 400 tez. Analiza wyników przędz rotorowych i obrączkowych wykazała, że przędze rotorowe charakteryzują się większą sprężystością, co uzasadnia ich główne zastosowanie na cele dziewiarskie.