Abstract
In order to obtain knowledge of interlacers generating a high number of tangles, the yarn motion was observed in slit-type interlacers with various sizes with high-speed video cameras. Results obtained are as follows: (1) Interlaced yarn is generated by the iteration of closed, dispersion and twisting states of running yarn independent of size of interlacer. (2) Interlacers generating a high number of tangles are supposed to have the following characteristics: Yarn passage region, where the airflow velocity is low, is small. In addition, the twin vortex has high dynamic pressure, filaments disperse to the whole yarn passage, plural twists generate in a yarn cross-section by the twisting action of the twin vortex, and a series of entanglements with different twist types occurs in the direction of yarn axis. Hence, strong entanglements between filaments are formed.
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