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On‐Line determination of density and crystallinity during melt spinning
Author(s) -
Bansal Vishal,
Shambaugh Robert L.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10679
Subject(s) - crystallinity , materials science , spinning , fiber , birefringence , polypropylene , composite material , line (geometry) , optics , physics , geometry , mathematics
The density and crystallinity of polypropylene fiber were measured on the moving threadline during the melt spinning process. Heretofore, threadline densities have never been measured on‐line. These density measurements were accomplished by taking parallel, on‐line measurements of fiber diameter, fiber velocity, polymer mass flow rate fiber temperature, and fiber birefringence. Under certain spinning conditions, a distinct rise in density occurs along the threadline. This rise in density corresponds well with the rise in crystallinity as measured by birefringence.