link no. 59 customer magazine spun yarn systems - Rieter

More documents

Recommendations

Info

24 LINK 59 . 1 /2012 TECHNOLOGY Mean fiber length (n) [mm] Fig. 6 Fig. 7 Number of imperfections Fig. 8 MEAN FIBER LENGTH PER PROCESS STAGE AND YARN TYPE 100 % cotton 1 1/16", Almeter 2 2 . 0 2 1 . 5 2 1 . 0 2 0 . 5 2 0 . 0 1 9 . 5 1 9 . 0 1 8 . 5 1 8 . 0 1 7 . 5 1 7 . 0 1 6 . 5 1 6 . 0 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 250 225 200 175 150 125 100 75 50 25 0 bale after B 12 blowroom ring carded 35 14.87 60 card lap comber sliver autoleveler draw frame 0,105 0,104 0,105 0,073 0,011 0,019 0,109 0,107 0,109 0,099 0,054 42 after B 60 38 14.71 card input 68 ring combed TRASH CONTENT PER PROCESS STAGE AND YARN TYPE 100 % cotton 1 1/16", ITV Ring carded Ring combed Rotor carded Rotor combed 24 card pre- lap comber autoleveler roving drawframe sliver drawframe 10 15.48 217 rotor carded YARN QUANITY DEPENDENT ON SPINNING PROCESS 100 % cotton 1 1/16", Ne 30, αm = 109, R 40 and G 33 (winded) Rotor carded Rotor combed 13.9 % noil 63 Ring carded Thin places -50 % Thick places +50 % Neps +280 % 2 21 rotor combed 12.37 7 Ring combed 16.4 % noil combed carded CVm 16 15.5 15 14.5 14 13.5 13 12.5 12 11.5 11 The short fiber percentage affects the mean fiber length and consequently, alongside the fiber fineness, also the spinning limit and yarn quality. The mean fiber length is 19 mm in the case of the carded application and 20 mm – 21 mm depending on combing height in the case of the combed application (Fig. 6). The residual trash content in the feed sliver on the rotor spinning machine is an important criterion for the operational safety of a rotor spinning machine. Soiling of the rotor groove when the trash content is too high creates thread breakage. Experience shows that the residual trash content in the feed sliver for the rotor spinning process with yarns from Ne 20 – 30 should not be higher than 0.07 – 0.1 %. These requirements are fulfilled by the Shankar 6 cotton in the case of a carded application. With the combing process, the trash content is generally reduced by 60 – 85 % (Fig. 7). The combing process can thereby be technologically practical with a low combing level on the rotor spinning machine. In general, the raw material properties such as a high short fiber percentage, lower mean staple and trash content in the cotton affect the rotor spinning process far less negatively than the ring spinning process. Yarn results Imperfections (IPI) and yarn unevenness. The total number of imperfections with combed and carded rotor yarn lie with α m = 109 (α e = 3.6) at the same level. The number of imperfections in carded ring yarn is significantly greater compared to rotor yarn, despite reduced card production at 80 kg/h instead of 100 kg/h. The combing process – and thereby also the additional elimination of short fibers – shows no advantages in the rotor line in relation to yarn evenness. This result is extraordinary as the short fiber content in the ring spinning process clearly influences the yarn evenness. That means that with the rotor spinning process short fibres in the fiber guide channel can be guided far better than is possible with ring spinning in the drafting arrangement.
Number of particles/1 000 m Fig 9 Fig. 10 TRASH PARTICLES IN THE YARN DEPENDENT ON PROCESS 100 % 1 1/16" Cotton, Yarn count Ne 30, αm = 109, R 40 and G 33 (winded) Rotor carded Rotor combed 13.9 % comber noil Ring carded Ring combed 16.4 % comber noil If the short fiber percentage is reduced by combing, a better yarn quality is achieved with ring spinning. This is impressively conspicuous with combed cotton yarn with an approx. 16 % level of noil extraction and a yarn count of Ne 30. The measurements show that by means of the combing process in comparison to a ring yarn, a marked improvement in the yarn evenness and purity can be recognized. The yarn quality values then show better results than those of a carded rotor yarn (Fig. 8). 100 % COTTON 1 1/16", NE 20, COMBER NOIL 13.9 %, R 40 AND G 33 (WINDED) Rotor carded, αm = 109 Rotor combed, αm = 109 Ring combed, αm = 98 Ring carded, αm = 109 LINK 59 . 1 /2012 TECHNOLOGY The residual trash content of a rotor yarn is far better than with carded ring yarn, due to the trash extraction on the opening roller in the case of a carded application. Only the combing process and the related elimination of trash particles make a very low residual trash content possible also with ring yarn. Yarn strength and elongation The carded Ne 20 rotor yarn when compared to combed rotor yarn at an identical twist factor has an approx. 1 cN/tex lower yarn strength because of the smaller mean staple length. The strength of the carded Ne 30 ring yarn, however, is higher by 1 cN/tex when compared to carded rotor yarn. It is common knowledge that in direct comparison to rotor yarns with an equal raw material structure, ring yarns exhibit higher strength. This is linked to the fiber orientation in the yarn bundle resp. the structure of the core and wrapped fibers. Yarn hairiness and abrasion Processing of the yarns is made on a circular knitting machine. Ring and rotor yarns differ clearly with regard to hairiness. This difference is based on the varying yarn structures of a ring and a rotor yarn. The hairiness according to Uster Tester 4 is almost double with a carded ring yarn as with a rotor yarn. The differences between a carded and a combed rotor yarn are minimal. The combing process does not affect the 25
Page 1 and 2: The customer magazine of Rieter Spu
Page 3 and 4: Ready for the Future Recent months
Page 5 and 6: On the one hand, we are able to mor
Page 7 and 8: WASTE COMPOSITION IN THE BLOWROOM,
Page 9 and 10: Economy Quality Flexibility 1 2 Hig
Page 11 and 12: Automation in Combing More than 50
Page 13 and 14: Fig. 6 Lap change on the E 76 combe
Page 15 and 16: R 60 - Nm 28 / Ne 17, 100 % COTTON
Page 17 and 18: Fig. 2 With SERVOtrail the roving f
Page 19 and 20: NE 30, 100 % COTTON, KNITTING YARN
Page 21 and 22: 4 spinning systems in the Rieter Sp
Page 23: Installed rotors [1 000] Fig. 3 Fig
Page 27 and 28: The higher the grade, the better 6
Page 29 and 30: Innovative Retrofits for Draw Frame
Page 31 and 32: Presentation of the Rieter Award in

link no. 59 customer magazine spun yarn systems - Rieter

Create successful ePaper yourself

Delete template?

Save as template?