Study on Weld Characteristics of Thin-wall Injection Molded Polypropylene Plates

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  • Saito Takushi
    Department of Mechanical and Control Engineering, Tokyo Institute of Technology
  • Ide Shin-nosuke
    Department of Mechanical and Control Engineering, Tokyo Institute of Technology
  • Ito Hiroshi
    Department of Polymer Science and Engineering, Yamagata University
  • Yasuhara Toshiyuki
    Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology
  • Kawaguchi Tatsuya
    Department of Mechanical and Control Engineering, Tokyo Institute of Technology
  • Satoh Isao
    Department of Mechanical and Control Engineering, Tokyo Institute of Technology

Bibliographic Information

Other Title
  • ポリプロピレン薄肉射出成形品のウェルドに関する研究
  • ポリプロピレン ウスニク シャシュツ セイケイヒン ノ ウェルド ニ カンスル ケンキュウ

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Description

This paper deals with a fundamental study on the weld structure of thin-wall injection molded polypropylene plates. Effects of the mold temperature and plate thickness on the weld characteristics were investigated. In the experiment, several measurements were performed; distribution of the optical retardation, specific latent heat for fusion, V notch depth and width, and tensile strength of the specimen. The results indicated that the fountain flow of the melt occurred in the filling stage even with a plate thickness of 0.3 mm. It was also shown that molecular orientation in the weld region was relatively low. Thermal property measurement showed that crystallinity of the molded specimen was affected not only by the mold wall temperature but also by the plate thickness. Mechanical strength reduction by the existence of the weld was experimentally confirmed through the tensile test, and it was shown that the thin-wall polypropylene plate molded at high mold temperature broke from the weld region under small strain.

Journal

  • Seikei-Kakou

    Seikei-Kakou 20 (10), 776-780, 2008

    The Japan Society of Polymer Processing

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