link no. 59 customer magazine spun yarn systems - Rieter

More documents

Recommendations

Info

22 LINK 59 . 1 /2012 TECHNOLOGY Processing of Indian Cotton How can 1 1/16" cotton with a high short fiber content best be processed? Tests on the Rieter rotor spinning and ring spinning systems provide indications. The possibilities and the potential of processing 100 % cotton on a rotor spinning machine are today in the Asian countries still far from being exhausted. You can obtain further details on this test in the 20-page special print “Processing Indian Raw Cotton” which you can download in Internet using the printed code. http://bit.ly/ItN4Lm Fig. 1 Areas of application of the spinning systems. [1 0 0 0 0 0 0 tons] (mm) (inch) RANGE OF APPLICATION OF THE SPINNING SYSTEMS FOR 100 % COTTON 5 . 0 4 . 5 4 . 0 3 . 5 3 . 0 2 . 5 2 . 0 1 . 5 1 . 0 0 . 5 0 2 3 . 0-2 5 . 4 2 6 . 1 9 2 6 . 9 9 2 7 . 7 8 2 8 . 5 8 2 9 . 3 7 3 0 . 1 6 3 0 . 9 6 3 1 . 7 5 3 2 . 5 4 3 3 . 3 4 3 4 . 1 3 3 4 . 9 3 3 5 . 7 -4 4 . 4 1 2 9 /3 2 -1 1 1 /3 2 1 1 /1 6 1 3 /3 2 1 1 /8 1 5 /3 2 1 3 /1 6 1 7 /3 2 1 1 /4 1 9 /3 2 1 5 /1 6 1 1 1 /3 2 1 3 /8 1 3 /3 2 -1 3 /4 short AFIS Autojet; commercial staple; UQL (w) (mm) In the processing of 100 % cotton with the rotor spinning system, the appropriate field of application based on economic and quality aspects lies in a staple length range from 1" to 1 1/8" cotton. According to the short fiber percentage and trash content of the cotton, the rotor technology is often the only option to produce yarn economically – and simultaneously in the quality demanded. Depending on the staple length of the cotton, the areas of application for the various end spinning processes can thereby be allocated (Fig. 1). Up to 2010 already 7.8 million rotor spinning units worldwide have been installed. In comparison to the installed ring spindles, this number is small. As, however, the productivity of a rotor unit compared to a ring spinning unit is higher by the factor Ring spinning Rotor spinning Air-jet spinning medium long extra long SPINNING UNITS INSTALLED WORLDWIDE 2010 Total installed spinning units [million] 1 6 0 1 4 0 1 2 0 1 0 0 8 0 6 0 4 0 2 0 0 71 162 Fig. 2 Installed spinning units worldwide. 7,8 1,5 Ring carded Ring combed Rotor Air-Jet 6, this corresponds to a percentage of approx. 30 % of the yarn production. Worldwide, rotor spinning is an established technology that fulfils the presently demanded high requirements for the yarn in downstream processing (Fig. 2). The yarn fineness with rotor technology lies in the range from Ne 3 – 40, whereby the typical and mostly produced yarn count is Ne 30. Yarns in this count are primarily used in circular knitting but are also processed in weaving (Fig. 3). With rotor spinning, various process stages can be selected for the processing of the fibers (Fig. 4). The choice of the process operation with rotor spinning depends on the yarn count to be produced and the required yarn quality. With the processing of 100 % cotton and a yarn count of Ne 30, a process using a card without drafting module and 1 or 2 subsequent drafting passages is most practical. Test structures To be able to show how the two spinning systems – ring and rotor – react to an increased percentage of short fibers, Indian Shankar 6 cotton with a relatively high short fiber percentage was used and processed to 8 various yarns. The yarn values of these 8 yarns were subsequently compared, so as to define the optimal procedure for short staple cotton.
Installed rotors [1 000] Fig. 3 Fig. 4 Short fiber content < 12.5 mm (n) [%] Fig. 5 MAIN AREAS OF APPLICATION FOR ROTOR SPINNING Total number of rotors installed 7 699 980 3 0 0 0 2 5 0 0 2 0 0 0 1 5 0 0 1 0 0 0 5 0 0 3 5 . 0 3 2 . 5 3 0 . 0 2 7 . 5 2 5 . 0 2 2 . 5 2 0 . 0 1 7 . 5 1 5 . 0 1 2 . 5 1 0 . 0 7 . 5 5 . 0 0 692 1 536 1 845 2 774 652 188 13 3 6 12 18 Yarn count [Ne] 24 30 40 PROCESS SEQUENCE OF THE RIETER ROTOR SYSTEM VARIOline Card C 70 VARIOline Card C 70 with SB-Module VARIOline Card C 70 with RSB-Modul Draw frame SB-D 45 Shorter process Shortest process Draw frame RSB-D 45 Draw frame RSB-D 45 SHORT FIBER PERCENTAGE PER PROCESS STAGE AND YARN TYPE 100 % cotton 1 1/16", Almeter bale after B 12 blowroom ring carded after B 60 card input ring combed Rotor spinning R 60 Rotor spinning R 60 Rotor spinning R 60 carded combed card pre- lap combed autoleveler roving drawframe sliver drawframe rotor carded rotor combed LINK 59 . 1 /2012 TECHNOLOGY 1. Ring yarn, carded, Ne 20 2. Ring yarn, carded, Ne 30 3. Ring yarn, combed, Ne 20, noil extraction 16 % 4. Ring yarn, combed, Ne 30, noil extraction 16 % 5. Rotor yarn, carded, Ne 20 6. Rotor yarn, carded, Ne 30 7. Rotor yarn, combed, Ne 20, noil extraction 14 % 8. Rotor yarn, combed, Ne 30, noil extraction 14 % The yarns were processed using carded and combed operations to yarn counts of Ne 20 and 30. With both yarn types, the influence of the short fiber percentage on the yarn values was also examined. For this purpose, the raw material was additionally combed, 14% with the rotor spinning process and 16 % with the ring spinning process. The card production was adapted, depending on the end spinning system, with 100 % kg/h for the rotor application and with 80 kg/h for the ring application. Raw material results The short fiber percentage of the cotton at 22 % is relatively high. Technical measurement showed a rise in the short fiber proportion due to the fiber interlacings resulting from the cleaning stages in the blowroom. This is, however, not a true fiber shortening. The reason is that the technical measuring options available also record fiber interlacings as short fibers. During the carding process, a parallelization of the fibers again takes place. The measured short fiber percentage in the bales should ideally show the same short fiber percentage in the sliver as in the bales, when subjected to gentle cleaning and carding, after fiber parallelization by the drafting passages. The short fiber percentage after noil extraction is 10 % with the ring spinning process and 15 % with the carded rotor spinning process (Fig. 5). 23
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: 4 spinning systems in the Rieter Sp
Page 25 and 26: Number of particles/1 000 m Fig 9 F
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?