The Role of Sheath Fibers in Influencing Twist Loss in Rotor Spinning

Abstract

The twist loss in rotor spinning has been attributed to various possibilities, including those of slippage between the fiber ring and the rotor wall, and the reaction to the turning moment during the twisting of the yarn. In the present study a hypothesis has been put forward to explain the twist loss through the incidence of sheath fibers. It has been shown that there is a strong association between the twist-efficiency and the percentage of sheath fibers..

Process control in ring and rotor spinning

“…Salhotra 71 has put forward a hypothesis to explain twist loss through the incidence of sheath fi bres. According to Salhotra the transmission of twisting torque cannot be one hundred percent effi cient; there is always a possibility of leakage through fi bre ends at the yarn forming point.…”

“…It was mentioned by Audivert 72 that the difference between adjusted machine twist and measured twist depends on the value of machine twist and yarn linear density, where higher machine twist and higher yarn linear density provides a higher percentage of twist deviation (PTD). Salhotra 71 observed that, as the twist factor is increased from 38.3 to 57.4, there is an almost continuous decrease in twist effi ciency and an increase in the percentage of sheath fi bres. This is obviously due to the well-known increase in the length of the peripheral twist extent (PTE).…”