Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 14, Issue 1
Displaying 1-17 of 17 articles from this issue
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Index
Preface
Technical Note : Special Issue on The Latest Polymer Processing Technology
Special Lecture
Technical Reports
Reports from Universities and Institusions in Japan : 101
Reports from Oversea Universities and Institutions : 47
Reports of International Meeting
Memoir
Visiting Active Companies
Original Papers
  • Flow Pattern Prediction in Polyurethane Foaming Process by Numerical Analysis
    Tetsuo Mitani, Hiroyuki Hamada
    2002 Volume 14 Issue 1 Pages 57-61
    Published: January 20, 2002
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.14.57
    JOURNAL FREE ACCESS
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    A foam flow model for flow pattern predictions in polyurethane foaming in a thin cavity has been developed. The model was based on a Hele-Shaw approximation that considers the flow caused by foam expansion due to bubble generation. The flow pattern was calculated from the initial volumetric shape of the poured polyurethane reaction mixture without need for a detailed study of the foaming properties. Numerical flow analysis was carried out by the finite element method based on controled volume. The predictions were in good agreement with experimental results that were measured on panel type molds and a refrigerator. This model was appropriate for the rapid determination of the pouring position, the poured volume and the air vent position.
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  • Formation of Composition Gradient from Melted Polymer Blend of Poly (Oxyethylene) and Poly (Vinyl Acetate)
    Katsuo Orihara, Hiroki Takahashi, Katsuhiro Aoki, Masao Okamoto
    2002 Volume 14 Issue 1 Pages 62-67
    Published: January 20, 2002
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.14.62
    JOURNAL FREE ACCESS
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    The cross sectional composition of films of poly (oxyethylene) and poly (vinyl acetate) blends was observed by using a polarizing microscope. Graded structures across the thickness of the films were created by establishing temperature gradients from the top to the bottom surfaces the films during annealing. The results were confirmed by FTIR spectra. It was shown that the structure of the gradient, step or sea-island, was controled by the molding temperature and times. The driving force for the appearance of gradation was considered to be convection across the temperature gradient and the density and surface tension differences between the blended polymers in the molding process.
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