The key to improve roving quality lies in reducing weight unevenness and improving yarn evenness.
提高粗纱质量的重点是降低纱的重量不匀率，提高粗纱条干的均匀度。
FA478 increases the itinerancy pneumatic suction motion, it makes the roving yarn evenness to improve.
FA478还增加了巡回式吹吸风装置，使粗纱条干均匀度明显提高。
Relation among feeding roving gauge, twist factor and yarn property were researched, property of polyacrylonitrile preliminary heat treatment in oxidizing polyester filament core-spun yarn was tested.
研究了喂入粗纱间距、捻系数与成纱性能的关系，测试分析了聚丙烯腈预氧化纤维涤纶长丝包芯纱的性能。
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