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- ITO Hiroshi
- Graduate School of Science and Engineering, Tokyo Institute of Technology
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- YAGISAWA Yusuke
- Graduate School of Science and Engineering, Tokyo Institute of Technology
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- SAITO Takushi
- Graduate School of Science and Engineering, Tokyo Institute of Technology
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- YASUHARA Toshiyuki
- Graduate School of Science and Engineering, Tokyo Institute of Technology
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- KIKUTANI Takeshi
- Graduate School of Science and Engineering, Tokyo Institute of Technology
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- YAMAGIWA Yoshitoshi
- Nissei Plastic Industrial Co., LTD.
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説明
Thin-wall injection molding of polypropylene (PP) was performed to clarify the structure and mechanical properties of micro-scale molded products. Effects of mold thickness and process conditions on processability in micro injection molding were evaluated. Furthermore, the structure and mechanical properties of molded products were analyzed using wide angle X-ray diffraction, birefringence, DSC measurements, and tensile testing. The molecular orientation in the vicinity of the gate was higher than that at any other positions. Birefringence increased with decreasing mold temperature, whereas crystallinity decreased with decreasing mold temperature. Results of cross-sectional observation also revealed a skin-core structure inside the molded products; spherulite structure at core region was not observed at thin cavity thickness at low mold temperature. The thickness ratio between the thickness of skin-shear layers and total cavity thickness increased at thinner cavity thickness. Elongation at break of the products with cavity thickness of 0.3 mm became higher with decreasing mold temperature.
収録刊行物
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- Theoretical and Applied Mechanics Japan
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Theoretical and Applied Mechanics Japan 54 263-268, 2005
日本学術会議 「機械工学委員会・土木工学・建築学委員会合同IUTAM分科会」
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詳細情報 詳細情報について
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- CRID
- 1390001205209458944
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- NII論文ID
- 130004463572
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- ISSN
- 13494244
- 13480693
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- CiNii Articles
- OpenAIRE
- Crossref
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- 抄録ライセンスフラグ
- 使用不可