The Influence of Fiber Length Distribution on Yarn Properties Based on Fiber Random Arrangement in the Yarn

摘要

This study discussed the influence of fiber length distribution on yarn qualities (yarn irregularity and strength) based on simulation on fiber random arrangement. Yarn limit irregularity is expressed as the variation of total fiber length that could be found in each yarn subsection. Yarn strength is expressed as the total contributions that breaking and slipping fibers make to yarn strength. Fiber slippage or breakage depends on critical slipping length. Ramie yarns with different stretch-broken fiber lengths were introduced to verify the calculation. Results show that yarn limit irregularity is only dependent on average fiber length and is irrelevant with the distribution type of fiber length. Yarn limit irregularity rises slowly with the increase of average fiber length. Nevertheless, fiber length distribution has significant effect on yarn strength. When average fiber length and its variation are identical, the left deviated distribution may lead to a lower yarn strength, while the right deviated distribution may obtain a higher yarn strength. Therefore, understanding the influence of fiber length distribution on yarn properties will be helpful for selection of fiber length to produce high-quality yarns.