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Abstract

The melt spinning process for hollow fibers is numerically simulated using a finite element method. The dynamics of hollow fiber spinning can be described by a two- dimensional finite element method that considers the deformation of two free surfaces. The initial grid is constructed and the new one is generated iteratively until it reaches a convergence. Converged solutions are obtained through successive iterations. A large rate of area reduction and rapid solidification are the characteristics of melt spun hollow fibers, compared with circular cross-sectional fibers. Analysis of the effect of spinning parameters on the process shows that spinning temperature and mass throughput rate are the most critical variables in controlling the hollow portion of the fiber, followed by take-up velocity and quench air velocity. Quench air temperature has a smaller effect than the other variables. The effect of changing process variables decreases as the die gap becomes narrow.

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Numerical Simulation of the Melt Spinning of Hollow Fibers

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