| Project/Area Number |
09650826
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
化学工学一般
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OHSHIMA Masahiro Chem.Eng.Dept.KYOTO UNIVERSITY Associate Prof., 工学研究科, 助教授 (60185254)
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| Co-Investigator(Kenkyū-buntansha) |
KURAMADA Ken-ichi Chem.Eng.Dept.KYOTO UNIVERSITY Instructor, 工学研究科, 助手 (80273473)
TANIGAKI Masataka Chem.Eng.Dept.KYOTO UNIVERSITY Professor, 工学研究科, 教授 (30027148)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | Polymericfoam / physical foaming / polymer / polypropylene / CAD / 成形加工 / 気泡成長シミュレーション / 高分子 / 発泡現象 |
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| Research Abstract |
The effect of processing variables such as concentration of dissolved gas, release rate of pressure and operation temperature on bubble growth dynamics, nucleation rate and final bubble size was examined by both simulation and fundamental experiments. In the polyolefin foaming process, fundamental experiments showed that bubble size increased when the release rate of pressure decreased, whereas bubble size decreased when the operating temperature decreased. Furthermore, a higher concentration of dissolved gas resulted in smaller bubble size. These results were confirmed by numerical simulation that was newly developed in this project. The simulator was developed based on Shafs nucleation and bubble growth models. Both simulation and experimental results elucidated that release rate of pressure, concentration of dissolved gas and operating temperature are the principal factors which control bubble size and foaming density in the polymeric foaming process. Optimal design of die remained as one of the unsolved problems.
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