Compact Spinning for Improved Quality of Ring-Spun Yarns

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Table 2. Determined quality parameters of compact and conventional yarns 20 tex made of 100% cotton fibres, produced on Suessen and Zinser ring spinning machines. Yarn quality parameters Unit FIBRES & TEXTILES in Eastern Europe October / December 2003, Vol. 11, No. 4 (43) Suessen Zinser compact conventional compact conventional Real fineness tex 19.90 18.90 20.28 19.96 CV of fineness % 2.02 1.99 1.42 0.97 Twist turns/m 771 780 771 748 CV of twist % 2.57 3.30 2.57 3.32 Breaking force cN 347 268 357 300 CV of breaking force % 11.10 9.92 6.56 7.02 Tenacity cN/tex 17.50 14.20 17.61 15.05 Elongation at break % 5.61 5.20 5.90 5.51 CV of elongation at break % 10.51 7.52 5.55 5.85 Work to break cN.cm 511 387 547 449 Irregularity Uster CV% 11.80 12.30 11.52 11.81 Thin places per 103 m (-50%) - 0 1 0 0 Thick places per 10 3 m (+50%) - 34 30 25 32 Neps per 103 m (+200%) - 121 107 87 101 Uster hairiness (H) - 3.80 5.80 4.64 5.54 Number of hairs per 102 m with length up to: 1 mm - 5775 13925 8448 9260 2 mm - 460 2474 1114 1530 3 mm - 66 1016 149 289 4 mm - 19 726 62 159 6 mm - 6 350 17 57 8 mm - 2 130 4 18 10 mm - 0 21 0 0 12 mm - 0 2 0 0 and compared: real fineness, twist, breaking force, elongation at break and work to break, Uster properties, hairiness and length distribution of hairs on 100 m of a yarn. An Uster Tester 3 was used for testing the hairiness of the produced yarns. The results are given in Tables 2-4. n Discussion Based on the researched and compared mechanical, physical, morphological and Uster values of the conventional and compact ring yarns spun on the Zinser and Suessen spinning machines, the following conclusions can be drawn: Properties of compared yarns made of 100% cotton fibres The breaking force of the compact yarn with a nominal linear density of 20 tex and spun on a Zinser ring spinning machine is 18.88% higher than the conventional ring spun yarn, produced on the same machine but without the condenser unit. The breaking force of the compact yarn spun on the Suessen ring spinning machine is up to 29.48% higher when compared with the conventional ring spun yarn, produced on the same machine but without the condenser unit. A higher difference in breaking force between the compact and conventional yarns produced on the Suessen ring spinning machine can be explained with the construction of the drafting system that enables maximum fibre condensation all the way up to the clamping line, which is not the case in Zinser’s drafting system. A greater breaking force was measured in the yarn produced on the Zinser spinning machine. Elongation at break of compact yarns is 7 to 8% higher compared to conventional yarns. The tenacity of a compact yarn produced on the Zinser spinning machine surpasses the conventional yarn by 17%, while this value is higher by up to 23.24% in the yarns spun on the Suessen spinning machine. A slightly higher value is noted in the yarn produced on the Zinser spinning machine. The work to break of a compact yarn spun on a Zinser spinning machine is 21.82% higher than in conventional yarn. In the compact yarn produced on the Suessen spinning machine, the work to break is 32% higher than that of the conventional yarn. the higher absolute value of work to break was determined in the compact yarns produced on the Zinser spinning machine. The physical and mechanical properties of the compact and conventional yarns are represented in Figure 3. No significant changes regarding Uster properties (Uster CV%, number of thin, thick places and neps) in the conventional and compact yarns were determined. This can be explained by the use of the same three-cylinder drafting equipment, which is proven to be the major influence on these yarn properties. The Uster hairiness (H) of compact yarns is significantly lower when compared with the hairiness of conventional yarns (Figure 4). Conventional ring spun yarn produced on the Suessen spinning machine has an Uster hairiness H=5.80, and the yarn spun on Zinser spinning machine has an Uster hairiness H=5.54. A lower value of Uster hairiness, H=3.80, was determined in compact yarn produced on the Suessen spinning machine, while that spun on the Zinser spinning machine has an Uster hairiness H=4.64. The reason for this is the construction of the drafting equipment, as explained above. The morphology of the yarn, defined as the number of hairs of different length per 100 metres, shows the significantly lower primary hairiness (1 to 3 mm) and secondary hairiness (4 to 12 mm) of compact yarns. Better results and significant improvements were achieved with the Suessen spinning machine, which can also be explained by the special construction and elements of the drafting unit. Properties of compared yarns made of 50% CO/50%PES fibre blend When comparing the physical and mechanical properties of conventional and compact yarns produced of 50% CO/50% PES fibre blend, we found no significant differences. This can be explained by the greater bending rigidity of polyester fibre component, which reduces the fibre condensing effect and its contribution to better physical and mechanical properties of compact yarns. The analysed Uster properties of conventional and compact yarns are very similar, which confirms the fact that the condensing effect significantly influence neither the yarn irregularity nor the number of yarn faults. The Uster hairiness (H) of compact yarns is significantly lower when compared with the hairiness of conventional yarns. A slightly better hairiness value was determined in yarn spun on the Zinser spinning machine (H=3.26) when compared with the yarn produced on the Suessen spinning machine (H=3.20). The primary and secondary hairiness of a compact yarn made from this mixture 33
and spun on the Zinser spinning machine are better than in yarn produced on the Suessen ring spinning machine. Both compact yarns have significantly improved primary and secondary hairiness when compared with conventional ring yarns. Properties of compared yarns made of 87% CO/13% CV fibre blend The breaking force of the compact yarn with a nominal linear density of 20 tex and spun on a Zinser ring spinning machine is 18.32% higher than the conventional ring spun yarn produced on the same machine but without the condenser unit. The breaking force of the compact yarn spun on the Suessen ring spinning machine is up to 32.30% higher than the conventional ring spun yarn produced on the same machine but without the condenser unit. Elongation at break of compact yarns is 4 to 11% higher compared to conventional yarns. The tenacity of a compact yarn produced on the Zinser spinning machine surpasses the conventional yarn by 15.90%, while this value is higher at up to 28.87% in yarns spun on the Suessen spinning machine. A higher absolute value of tenacity is determined in yarn produced on the Suessen spinning machine. The work to break of a compact yarn spun on the Zinser spinning machine is 20.87% higher than in conventional yarn. In compact yarn produced on the Suessen spinning machine, the work to break is up to 41.88% higher compared to the conventional yarn. A slightly higher absolute value of Work to break was determined in compact yarns produced on the Suessen spinning machine. The analysed Uster properties of conventional and compact yarns have very similar values. Conventional ring spun yarn produced on a Suessen spinning machine has an Uster hairiness of H=5.20, and the yarn spun on the Zinser spinning machine has an Uster hairiness of H=4.72. A lower value of Uster hairiness, H=3.40, was determined in compact yarn produced on the Suessen spinning machine, while the yarn spun on the Zinser spinning machine has an Uster hairiness of H=3.60, which can be explained by the inability of Zinser’s drafting system to keep thoroughly condensed fibres up to the clamping line. The Uster hairiness (H) of compact yarns is significantly lower when compared with the hairiness 34 Table 3. Determined quality parameters of compact and conventional yarns 20 tex made of 50% PES/50% CO fibre blend, produced on Suessen and Zinser ring spinning machines. Yarn quality parameters Unit Suessen Zinser compact conventional compact conventional Real fineness tex 20.10 20.80 20.32 20.25 CV of fineness % 1.52 1.83 1.52 1.83 Twist turns/m 782 779 782 741 CV of twist % 3.57 4.00 3.57 4.00 Breaking force cN 370 365 376 379 CV of breaking force % 8.80 9.30 7.90 8.45 Tenacity cN/tex 18.40 17.60 18.51 18.72 Elongation at break % 8.10 8.20 8.10 8.16 CV of elongation at break % 8.50 8.50 8.17 7.72 Work to break cN.cm 826 838 827 823 Irregularity Uster CV% 12.80 12.90 12.98 12.22 Thin places per 103 m (-50%) - 1 0 1 0 Thick places per 10 3 m (+50%) - 39 45 65 39 Neps per 103 m (+200%) - 95 95 111 85 Uster hairiness (H) - 3.20 4.10 3.26 3.76 Number of hairs per 102 m with length up to: 1 mm - 5786 9693 5096 5952 2 mm - 492 1513 559 855 3 mm - 87 580 73 152 4 mm - 33 380 25 84 6 mm - 14 192 6 29 8 mm - 4 72 0 0 10 mm - 1 10 0 0 12 mm - 0 1 0 0 Table 4. Determined quality parameters of compact and conventional yarns 20 tex made of 87% CO/13% CV fibre blend, produced on Suessen and Zinser ring spinning machines. Yarn quality parameters Unit Suessen Zinser compact conventional compact conventional Real fineness tex 20.50 20.01 20.90 20.47 CV of fineness % 1.30 1.90 1.29 1.90 Twist turns/m 785 743 785 743 CV of twist % 4.15 3.30 4.15 3.30 Breaking force cN 340 257 340 287 CV of breaking force % 7.40 11.00 8.20 7.94 Tenacity cN/tex 16.60 12.90 16.26 14.03 Elongation at break % 5.80 5.20 5.77 5.94 CV of elongation at break % 6.70 7.50 6.65 7.38 Work to break cN.cm 542 382 536 443 Irregularity Uster CV% 12.10 12.40 12.19 12.42 Thin places per 103 m (-50%) - 0 0 0 0 Thick places per 103 m (+50%) - 29 20 23 22 Neps per 10 3 m (+200%) - 75 53 61 58 Uster hairiness (H) - 3.40 5.20 3.60 4.72 Number of hairs per 102 m with length up to: 1 mm - 7900 14239 6290 8473 2 mm - 772 2635 712 1418 3 mm - 120 1003 82 257 4 mm - 32 638 22 134 6 mm - 10 303 5 43 8 mm - 5 116 1 15 10 mm - 1 18 0 0 12 mm - 0 1 0 0 of conventional yarns, irrespective of the machine system. Both the primary and secondary hairiness of a compact yarn made of this fibre blend and produced on the Zinser ring spinning machine are lower when compared with the yarn spun on the Suessen spinning machine. Both primary and secondary hairiness of compact yarns FIBRES & TEXTILES in Eastern Europe October / December 2003, Vol. 11, No. 4 (43)
Page 1 and 2: 30 Momir Nikolić, Zoran Stjepanovi
Page 3: The delivery top roller (31) is con

Compact Spinning for Improved Quality of Ring-Spun Yarns

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