Forces Acting On The Yarn Inside The Rotor

•There are various forces acting
on the yarn inside the rotor viz. :
 –Centrifugal forces on the length of yarn in the rotor
 –Frictional forces between yarn & rotor surface , & also particularly in the drawoff tube.
 –Airdrag forces between yarn & air.
 –Coriolis forces.
 • It should be mentioned that centrifugal forces , of course ,increase in proportion to the yarn count & as the square of both the rotor diameter & the speed of rotation .
 •The frictional forces depend upon the design of the system & on the fibres being spun.
 • The combined effects of these variables can be described by a system constant which the the theoretical drawoff forces , i.e. essentially the centrifugal forces , must be multiplied.
 •This system constant is the quotient of the actual drawoff tension divided by the theoretical drawoff tension.
 •Coriolis forces arise when a rotating mass changes its radius of rotation .
 • the dimensions of rotor spinning systems are such that the coriolis forces are negligible, relative to the centrifugal forces, & they can in practice be ignored.
 •Draw  off forces are negligible till rotor rpm of 30000, but varies almost directly with further increase in rotor rpm. It also varies directly with rotor diameter. Which also increases power consumption in the same proportion.
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