Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Foreword
Special Issue on Seikei-Kakou Autumnal Meeting 2025
Seikei-Kakou Autumnal Meeting 2025
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Special Lecture "Polymer Processing : Bridge to the Future"
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Report from Overseas
Topic on Products and Technologies
Original Paper
  • Yasunori Tanaka, Takatoshi Sakamoto
    2026Volume 38Issue 5 Pages 195-199
    Published: April 20, 2026
    Released on J-STAGE: May 20, 2026
    JOURNAL FREE ACCESS

    This study focuses on developing a predictive model for quantitatively assessing variations in the mechanical properties of microcellular foamed products, with particular emphasis on their tensile yield stress. The model allows for a more straightforward and precise estimation of tensile yield stress. Using polyamide 66 (PA 66) and polybutylene terephthalate (PBT), the relationship between lightweighting ratio and tensile yield stress in microcellular foamed products was investigated. The results demonstrate that the proposed predictive model can effectively estimate tensile yield stress based on the lightweighting ratio, offering a practical tool for engineers. Additionally, the study successfully predicted the strength of microcellular foamed products after environmental stress testing, confirming a high correlation with measured values. This ability to predict post-stress strength is significant for practical design considerations. These findings offer valuable insights for the design of plastic products, enabling lightweighting and sufficient mechanical strength. This contributes to reducing environmental impact through efficient material use and enhances product competitiveness in the market. Overall, this research highlights the potential of microcellular molding technology in advancing sustainable manufacturing processes.

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