Open end spinning

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  • 1. Presented by: Rajeev Kumar (21) Sanath kr. Pegu (24) Sushant kumar (25)
  • 2.
      • Open end spinning or open-end spinning is a technology for creating yarn without using a spindle
      • It is also known as break spinning or rotor spinning.
      • 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
  • 3.
      • The principle behind open end spinning is similar to that of a clothes dryer spinning full of sheets.
      • If you could open the door and pull out a sheet, it would spin together as you pulled it out
      • 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
  • 4.
      • 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
      • 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.
  • 5. V df , M f Transport Air Channel Rotor Yarn Package Feed Roll Sliver Condenser Sliver Feed Plate Trash Combing Roll
  • 6.
      • 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.
      • There is no opportunity for the internal stresses created in the fibers during drafting to relax
      • 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.
  • 7.
      • This permits internal stresses to be relaxed & gives rise to the term “free fiber spinning”
      • This enables twist to be imparted by rotation of the yarn end.
      • These fibers are then progressively attached to the tail or “open end” of already formed rotating yarn.
      • Thus the continuously formed yarn has only to be withdrawn & taken up on a cross-wound package
    Contd….
  • 8.
      • There is no roving stage or re-packaging on an auto-coner.
      • This system is much less labour intensive and faster than ring spinning with rotor speeds up to 140,000rpm.
      • Typical yarn count range: 6’s to 30’s
      • Fibers: (1) Fine (2) Strong
  • 9.
      • With open end spinning the yarn has individual fibers that are not arranged as uniformly as in wrap or ring spun yarns.
      • Most of the fibers are generally parallel, but with lots of crisscrossing, while some fiber irregularly wraps around the main bundle.
  • 10.
      • The disadvantage of open-end spinning is that it is limited to coarse counts.
      • Consequently cloth made from open-end yarn having a 'fuzzier' feel and poorer wear resistance.
  • 11.