Formation Of Coherent Fibre Strand
- •At the start of the development of the rotor spinning, the fibres were mistakenly guided directly into the fibre-collection groove.
- • The disadvantage was that , during the acceleration that had to be carried out, the fibres inevitably collided with the radial yarn end .
- •This led to a deterioration in the fibre orientation.
- •In currently available rotor spinning m/cs , the fibres flowing into the rotor strike directly against the rotor wall above the groove.
- The yarn so produced had the typical “sauerkrut” structure, with very low strength.
- •Higher rotor peripheral speed than colliding fibres gives the drafting effect which ensures straightening & lining-up of fibre.
- • Since at this juncture drafting is essential , it imposes lower & upper limits to the rotor speed.
- The air flows are very important in this region .
- •There should not be any air turbulence between the feed tube & the rotor wall.
- •The aim is to generate a uniform , rotating air stream that assists in forwarding the fibres onto the rotor wall in straight condition.
- •This depends , among other things , on the distance of the feed tube from the wall & the formation of the rotor cover that contains the feed tube.
- • Accordingly, several manufacturers use replaceable covers matched to the diameter of the rotor, which is also replaceable.
- •An incoming fibre strikes an inclined wall & is pressed outwards by an enormous centrifugal force -over 100000 times the weight of the fibre.
- • This causes the fibre to slide downwards on the rotor wall while being accelerated in the peripheral direction & to be deposited on the other fibres in the collection groove.
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