为探讨由多根单丝组成的长丝纱在受到拉伸作用时,发生单丝断裂的性能及其测试与表征方法,对一种锦纶6无捻长丝纱进行了拉伸试验,获取了断丝发生的典型拉伸断裂曲线;通过分析该断裂曲线特征,建立了基于断丝频次和应力条件的表征长丝纱断丝性的指标体系;对3种不同长丝纱进行了拉伸不同验,分别计算出表征长丝纱断丝性的指标并对其进行分析.结果表明:长丝纱在拉伸至断裂过程中,部分试样会发生单丝断裂现象,且可能不只发生1次;每次单丝断裂均会在拉伸断裂曲线上形成一个锯齿状波形;长丝纱的断丝性可用一定次数拉伸试验中断丝发生的频次类指标和断丝发生时的应力类指标进行表征,发生第1次断丝时的应力值越低,断丝频次越高,表明长丝纱越易发生断丝.%In order to study the filament breakage performance and its testing and characterization method of multifilament yarn when subjected to tensile action , the tensile properties of a polyamide 6 non-twisted multifilament yarn were tested , and typical tensile curves with filament breakage were obtained . With the typical tensile curves being analyzed , the index system of the filament breakage of multifilament was established based on the breaking frequency and the stress condition when the monofilament was broken .The tensile properties of three kinds of filament yarns were tested , the indexes of filament breakage were calculated and the evaluating method of filament breakage of multifilament was discussed . The results show that filament breakage will occur in some samples among the tensile tests of multifilament yarns, and filament breakage may occur more than once during test of a sample .Each filament breakage will create a jagged waveform on the tensile fracture curve .The filament breakage of multifilament yarns can be characterized by the filament breakage frequency indexes and the stress-related indexes when the filament breakages occur .In a certain number of tensile tests , the lower the stress at the time of the first filament breaking , the higher the frequency of filament breakage , indicating that the multifilament yarn is more likely to occurs filament breakage .
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