Crystallization-controlled limitations of melt spinning†

A numerical simulation of melt spinning reveals bifurcation of dynamic solutions leading to limited spinning conditions. The bifurcation phenomenon is controlled by stress-oriented crystallization and crystallinity-dependent polymer viscosity. Under the conditions of bifurcation, the space of the spinning conditions (take-up velocity × filament thickness) splits into three regions corresponding to amorphous fibers, partially crystalline fibers, and inaccessible conditions. Major factors affecting the maximum spinning speed and minimum filament thickness for melt-spun poly(ethylene terephthalate) are analyzed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 105: 215–223, 2007

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