Open end spinning

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 PlateTrash
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withdrawn & taken up on a cross-wound package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.