Maximum Twist Limit In Rotor Spinning

By: P.Grosberg & S.A.Mansour

  • The probability of an end break increases as the amount of twist increases at any given rotor speed.
  •  As the limiting twist is approached the probability of an end break becomes nearly the same irrespective of spinning speed.
  • The mean tension differs from the mean strength by 4.8 to 5.5 standard deviations.
  • The fact that at the limiting twist the probability of an end break reaches a constant value at all speeds strongly suggests that the reason for the twist limit is that the end breakage rate is due to the combined effects of lowered strength because of excessive twist, and increases in tension & tension variations.
  •  The last two effects which are due to the higher speeds result in excessive end breakage rates which cause the observed twist limitation.
  •  It must be noted that with the end breakage rate found at the limiting twist it would be expected that the differences between the mean strength & mean tension should be about four times the standard deviation, while the value actually found was 4.8-5.5 .
  •  However it should be noted that the method used to determine the end breakage rate at the spinning limit is not particularly accurate & this  probably accounts for the differences found between the experimental & calculated end breakage rate at the spinning limit


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