Open end spinning


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Open end spinning

  1. 1. Presented by: Rajeev Kumar (21) Sanath kr. Pegu (24) Sushant kumar (25)
  2. 2. <ul><ul><li>Open end spinning or open-end spinning is a technology for creating yarn without using a spindle </li></ul></ul><ul><ul><li>It is also known as break spinning or rotor spinning. </li></ul></ul><ul><ul><li>In this process the fiber sliver is separated into single fibers and in which the separated fiber material is brought by an air stream to a collecting surface from which it is drawn off while being twisted </li></ul></ul>
  3. 3. <ul><ul><li>The principle behind open end spinning is similar to that of a clothes dryer spinning full of sheets. </li></ul></ul><ul><ul><li>If you could open the door and pull out a sheet, it would spin together as you pulled it out </li></ul></ul><ul><ul><li>Sliver from the card goes into the rotor, is spun into yarn and comes out, wrapped up on a bobbin, all ready to go to the next step </li></ul></ul>
  4. 4. <ul><ul><li>The fiber material is deposited on a collecting surface moving in the direction of thread draw-off, is then twisted and is continuously drawn off said collecting surface in form of a thread </li></ul></ul><ul><ul><li>The single fibers are fed upon the collecting surface in the direction of said collecting surface's movement, whereby an alignment of the fibers on the collecting surface takes place. </li></ul></ul>
  5. 5. V df , M f Transport Air Channel Rotor Yarn Package Feed Roll Sliver Condenser Sliver Feed Plate Trash Combing Roll
  6. 6. <ul><ul><li>In conventional spinning ,the fiber supply is reduced to the required mass per unit length by drafting & then consolidated into a yarn by the application of twist. </li></ul></ul><ul><ul><li>There is no opportunity for the internal stresses created in the fibers during drafting to relax </li></ul></ul><ul><ul><li>In open end spinning, the fiber supply is reduced, as far as possible , to individual fibers, which are then carried forward on an air-stream as free fibers. </li></ul></ul>
  7. 7. <ul><ul><li>This permits internal stresses to be relaxed & gives rise to the term “free fiber spinning” </li></ul></ul><ul><ul><li>This enables twist to be imparted by rotation of the yarn end. </li></ul></ul><ul><ul><li>These fibers are then progressively attached to the tail or “open end” of already formed rotating yarn. </li></ul></ul><ul><ul><li>Thus the continuously formed yarn has only to be withdrawn & taken up on a cross-wound package </li></ul></ul>Contd….
  8. 8. <ul><ul><li>There is no roving stage or re-packaging on an auto-coner. </li></ul></ul><ul><ul><li>This system is much less labour intensive and faster than ring spinning with rotor speeds up to 140,000rpm. </li></ul></ul><ul><ul><li>Typical yarn count range: 6’s to 30’s </li></ul></ul><ul><ul><li>Fibers: (1) Fine (2) Strong </li></ul></ul>
  9. 9. <ul><ul><li>With open end spinning the yarn has individual fibers that are not arranged as uniformly as in wrap or ring spun yarns. </li></ul></ul><ul><ul><li>Most of the fibers are generally parallel, but with lots of crisscrossing, while some fiber irregularly wraps around the main bundle. </li></ul></ul>
  10. 10. <ul><ul><li>The disadvantage of open-end spinning is that it is limited to coarse counts. </li></ul></ul><ul><ul><li>Consequently cloth made from open-end yarn having a 'fuzzier' feel and poorer wear resistance. </li></ul></ul>