Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 3, Issue 2
Displaying 1-3 of 3 articles from this issue
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  • Injection Molding System for Hollow Parts
    Shoso Nishida
    1991 Volume 3 Issue 2 Pages 134-142
    Published: April 20, 1991
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.3.134
    JOURNAL FREE ACCESS
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  • A Study on Processing Conditions of Thermoplastic Composites with Commingled Yarn
    1st. Report: Commingled Effect on Bending Strength
    Hiroyuki HAMADA, Zen-ichiro MAEKAWA, Atsushi YOKOYAMA, Naoto IKEGAWA, ...
    1991 Volume 3 Issue 2 Pages 157-164
    Published: April 20, 1991
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.3.157
    JOURNAL FREE ACCESS
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    Thermoplastic composites have great advantage over thermoset composites in productivity and properties. However, thermoplastic composites have not been used so widely. Several impregnation techniques have been specially developed for thermoplastic composites because of the difficulty in impregnation of their matrices.
    In this paper, we propose a new impregnating system using a commingled yarn of continuous reinforcing fiber and thermoplastic matrix fiber, in order to facilitate the impregnation process. This yarn consists of glass fiber and Nylon 6 fiber. We are propose a quantitative method to evaluate the commingled state. We fabricated unidirectional composites using the commingled yarn. We performed bending tests and examined the influence of processing condition on the mechanical properties. Furthermore, unidirectional thermoplastic compositing using uncommingled yarn were also fabricated to evaluate the effect of the commingle process. It was clear that the commingled yarn composites hadl excelent impregnation under low pressure and short holding times, with excellent bending properties.
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  • Study on Appearance of Injection Molded Plastics
    Akihiro WADA, Shigetada KAWABATA
    1991 Volume 3 Issue 2 Pages 165-170
    Published: April 20, 1991
    Released on J-STAGE: November 18, 2009
    DOIhttps://doi.org/10.4325/seikeikakou.3.165
    JOURNAL FREE ACCESS
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    The influence of mold temperature on the appearance of molded plastics was examined in injection molding of thermoplastic resins. When a mold cavity was filled with the inner surface temperature of the mold being kept higher than the glass transition temperature (Tg) of the resin, the injection molded article was found to have excellent good surface aesthetics, as follow;
    •No Surface defects such as silver streaks, jetting and weld lines were observed in the injection molded articles.
    •Uniform, high gloss moldings with little gradient in gloss, were obtained for rubber-modified resins such as HIPS and ABS.
    •No fillers appeared on the surfaces of molded filled resins, for example, glassfilled ones. This implies that injection molding of filled resins results in the formation of skins without fillers.
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