Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 9, Issue 5
Displaying 1-15 of 15 articles from this issue
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Index
Preface : Special Issue on Processing of Network Polymers
Technical Note : Special Issue on Processing of Network Polymers
Technical Reports
Memoir
Special Lecture
Reports from Oversea Universities and Institutions
Original Papers
  • Calculation of Parison Formation Behavior from Laboratory Measurement
    Masayuki SHINOHARA, Toshihisa KAJIWARA, Kazumori FUNATSU
    1997 Volume 9 Issue 5 Pages 385-392
    Published: May 20, 1997
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.9.385
    JOURNAL FREE ACCESS
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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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  • Numerical Simulation of Solidification Process of Molten Polymer Flowing in a Two-Dimensional Flat Channel
    Masami TANIGUCHI, Yoshiaki AOKI, Yasuhiko HIRAO, Toshio AIHARA
    1997 Volume 9 Issue 5 Pages 393-399
    Published: May 20, 1997
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.9.393
    JOURNAL FREE ACCESS
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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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Q&A in Polymer Processing - Advices for a Better Molding Technology -
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