牵伸对纱条条干不匀影响的模拟研究

牵伸时纤维运动引起其排列变化是影响牵伸后纱条条干不匀的关键。为探究纤维变速点分布对牵伸后纱条条干不匀的影响,通过计算机模拟了实际纱条中的纤维排列(实际纱条),分别对理想纱条和实际纱条牵伸过程中的纤维运动进行了模拟,计算了在不同变速点分布下牵伸后纱条的条干不匀,并进行实验验证。结果表明:与理想纱条相比,实际纱条的条干不匀模拟值更接近实测值,且实际纱条能体现牵伸中变速点分布对牵伸后纱条条干不匀的影响,即变速点分布越分散,牵伸后纱条条干不匀越大;实际棉条模拟牵伸后的条干不匀值与实测值变化趋势一致,可用来预测牵伸后纱条的条干不匀。

Simulation study on effect of drafting on sliver unevenness

In the research of sliver unevenness after drafting, the change of fiber arrangement is the key to the problem, which is caused by fiber movement. In order to explore the influence of the accelerated point distribution on the unevenness of sliver after drafting, the fiber arrangement in the measured sliver was simulated, referred to as actual sliver. The fiber movement during the drafting process in the ideal sliver and the actual sliver was simulated, respectively. The unevenness of the actual sliver after drafting with different accelerated point distribution were calculated, and experiments were carried out. The results showed that compared with the ideal sliver, the actual sliver can better reflect the influence of the accelerated point distribution on the unevenness of the sliver after drafting, and an increase in the accelerated point variance is found to associate to the increase in the sliver unevenness. The unevenness of the actual cotton sliver after simulated drafting is roughly consistent with the trend of the measured value.