•The yarn end is pressed against the
rotor wall by the high centrifugal force, & the
separation point therefore rotates within the
• Each revolution
of the yarn at this point inserts one turn of
•The yarn twist penetrates into the fibre
ring in the collecting groove, where the fibres
are to be bound together to form a yarn.
•The length of this binding in zone is of
some significance for the spinning conditions &
the the yarn characteristics.
•If this length is too short , the
ends-down rate will be high ;
•If it is too long , twisting-in will be
very tight , & there will be many wrapping