Abstract:

In order to study the filament breakage performance and its testing and characterization method of multifilarment 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 breadage.

Key words: multifilament yarn, filament breakage, filament breakage frequency, polyamide 6