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Studies on melt spinning. III. Flow instabilities in melt spinning: Melt fracture and draw resonance
Author(s) -
Han Chang Dae,
Lamonte Ronald R.,
Shah Yatish T.
Publication year - 1972
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1972.070161221
Subject(s) - materials science , spinning , melt spinning , resonance (particle physics) , polystyrene , isothermal process , composite material , fracture (geology) , polypropylene , amplitude , melt flow index , polymer , mechanics , thermodynamics , optics , physics , copolymer , particle physics
An experimental study has been carried out to investigate threadline instabilities in melt spinning. Two types of melt threadline instabilities, draw resonance and melt fracture, were observed under both isothermal and nonisothermal spinning conditions. Polymers investigated were polypropylene and polystyrene. Draw resonance was observed as an increase of the take‐up speed above a critical value. It was also observed that an increase in take‐up speed reduces the severity of melt fracture, whereas once draw resonance occurs the amplitude and frequency of the pulsing thread diameter increases with the take‐up speed. The phenomenon of draw resonance was investigated by taking motion pictures of the pulsing molten threadline spun vertically downward. Furthermore, a stability analysis was carried out to explain the experimentally observed draw resonance.