Process stability and structure development in melt spinning with water-quenching bath was investigated. Extremely short air-gap led to the stabilization of process at high draw down ratio. At air-gap of 2 mm, spin-line was stable even at the draw down ratio of 25. Strain rate of the spin-line reached 40,000 s-1. Water-quenched fibers showed significant structural distribution in its cross-section, in that sheath layer has high molecular orientation and crystallinity, on the other hand, core layer has virtually no orientation and low entanglement density.
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