THE SPINNING SIMULATION OF POLYPROPYLENE MELT SPINNING AND ITS BIREFRINGENCE

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Other Title
  • ポリプロピレン溶融紡糸のシミュレーションと複屈折
  • ポリプロピレン ヨウユウ ボウシ ノ シミュレーション ト フククッセツ

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In this paper, the simulation for the polypropylene melt spinning was done to presume the birefringence of the spun filament by use of the results obtained in the previous report 7).<br>By taking into consideration of the heat balance and Trouton viscosity (tensile viscosity), the changes of filament temperature and its attenuation, and the spinning tension were calculated for given spinning conditions. From these results, the development in birefringence along the spinning line were presumed. The results agreed well with those observed in actual polypropylene melt spinning.<br>Next, the calculations of the spinning condition (melt temperature) for the desired filament birefringence were carried out with a satisfactory result.<br>Last, the effect in asymmetric cooling resulting from the transverse air flow for a filament axis were calculated on the distributions of the temperature and birefringence. The temperature distribution in the filament cross-section was obtained by solving the basic equation of the filament thermal conduction by means of finite-difference method, and the birefringence distribution was then estimated from its temperature distribution. This result is considered to be effective to analyze the latent crimp of the filament.

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 29 (10), T442-T450, 1973

    The Society of Fiber Science and Technology, Japan

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