母体长丝，诸如丙烯腈或纤维素（主要是人造丝）等在高温下碳化。
Precursor filaments such as acrylic or cellulose (mainly rayon)are carbonized at high temperature.
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。
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.
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