Yarn tension during air-jet filling insertion is analyzed experimentally and theo retically for drum and loop storage systems. In the case of drum storage, yarn tension is higher and more even. The model for drum storage shows that the yarn tension depends on the frictional force between the drum surface and the yarn, the mass linear density of the yam, and the unwinding speed. A set-up is developed for air friction coefficient measurements, and friction coefficients for two different yarns are deter mined.
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