Investigation of the Mechanism Dominating the Flow Mark Generation in Polymer Injection Molding from a Thermal Engineering Viewpoint.

• SATOH Isao

  Department of Mechanical and Intelligent Systems Engineering, Tokyo Institute of Technology

• KUROSAKI Yasuo

  Department of Mechanical and Control Engineering, The University of Electro-Communications

• TREDOUX Louis

  Department of Mechanical and Intelligent Systems Engineering, Tokyo Institute of Technology

Bibliographic Information

Other Title

• 射出成形品上のフローマーク発現機構の伝熱工学的検討
• シャシュツ セイケイヒン ジョウ ノ フローマーク ハツゲン キコウ ノ デン

Abstract

This paper deals with the basic mechanism dominating the wavelike flow mark generation in polymer injection molding. There have been a number of papers describing the relation between molding conditions and flow mark generation in polymer injection moldings, but very limited information about the basic mechanism dominating the flow mark generation has so far been reported. In the present paper, the authors paid attention to the development of the frozen polymer layer adjacent to the mold wall, just behind the melt-mold contact line, so as to evaluate analytically the bending strain in the developing frozen layer due to contraction of the polymer during solidification, and tried to correlate the flow mark generation with the bending strain. The result clearly showed that the aspect ratio of flow marks estimated from the bending strain in the frozen layer agrees well not only with the aspect ratios of the actual flow marks measured by ourselves, but also with the ones reported in the literature. The authors therefore concluded that the basic mechanism dominating the flow mark generation can be attributed to the bending strain in the developing frozen layer due to contraction of polymer during solidification.

Journal

• Seikei-Kakou

  Seikei-Kakou 10 (9), 732-741, 1998

  The Japan Society of Polymer Processing

Keywords

• Flow mark
• Basic mechanism
• Frozen layer
• Bending strain
• Contraction during solidification

Details

• CRID: 1390001204460029312
• NII Article ID: 10002131811
• NII Book ID: AN10278882
• DOI: 10.4325/seikeikakou.10.732
• ISSN: 18837417
• ISSN: 09154027
• NDL BIB ID: 4567436
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4567436
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed