Presented by:Rajeev Kumar (21)

Sanath kr. Pegu (24)Sushant kumar (25)

• 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

• 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

• 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.

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, Mf

Transport Air Channel

RotorYarn Package

Feed Roll

SliverCondenser

Sliver

Feed PlateTrash

Combing Roll

• 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.

• 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• Thus the continuously formed yarn has only to be withdrawn & taken up on a cross-wound package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….

• 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

• 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.

• 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.