成形加工
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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9 巻, 5 号
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目次
巻頭言 : 特集　ネットワークポリマー加工
解説 : 特集　ネットワークポリマー加工
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海外研究機関の紹介 : 27
論文
  • パリソン形成過程の予測
    篠原 正之, 梶原 稔尚, 船津 和守
    1997 年 9 巻 5 号 p. 385-392
    発行日: 1997/05/20
    公開日: 2009/11/18
    DOIhttps://doi.org/10.4325/seikeikakou.9.385
    ジャーナル フリー
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    In the extrusion blow molding process, it is desirable to predict the thickness distribution of finished product from the laboratory measurements of polymer properties. The thickness distribution of finished product depends on the parison formation and the parison formation process depends on the rheological properties of the polymer melt. The parison formation process was assumed as competition of uniaxial elongational flow and strain-recovery. A simple model was presented to calculate the parison formation process. The Giesekus model was selected as constitutive equation. The calculated dependences of parison length and thickness distribution on time were compared with experimental results of high molecular weight high density polyethylene with different relaxation spectra. Good agreement was obtained between theoretical and experimental data.
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  • 二次元平板間流路における溶融樹脂の凝固・結晶化過程の予測に関する研究
    谷口 雅巳, 青木 美昭, 平尾 康彦, 相原 利雄
    1997 年 9 巻 5 号 p. 393-399
    発行日: 1997/05/20
    公開日: 2009/11/18
    DOIhttps://doi.org/10.4325/seikeikakou.9.393
    ジャーナル フリー
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    Solidification process of molten polymer was simulated with a numerical simulation program developed by considering non-Newtonian flow and crystallization simultaneously. In our crystallization model, effects of non-isothermal and stress-induced crystallization kinetics were taken into account. The simulation model was applied to the solidification process of molten polypropylene, a crystalline plastic, flowing in a two-dimensional flat channel with both cooled walls. Various cooling wall temperature, polymer mass velocity, and the thickness of the test channel were investigated numerically. As the cooling wall temperature decreased, the thickness of the skin layer increased and the thin layer of low crystallinity was found near the cooling wall surface. Furthermore, the greater the mass velocity, the earlier the starting and saturating times of the growth of the skin layer. It was also found that the thickness of the non-dimensional skin layer bacame thicker with a decrease in the thickness of the test channel.
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