Seikei-Kakou
Online ISSN : 1883-7417
Print ISSN : 0915-4027
ISSN-L : 0915-4027
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Volume 33, Issue 10
Displaying 1-31 of 31 articles from this issue
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Index
Foreword
Seikei-Kakou Annual Meeting 2021
Session Reports
Technical Notes-Keynote Lectures in Seikei-Kakou Annual Meeting 2021
Report on 31st “Aoki-Katashi” Award
Technical Reports
Report from Universities and Institutions in Japan : 222
Report from Overseas
Original Paper
  • Development of Acoustic Absorption Materials Containing Pulp and Thermoplastic Foaming Agent:
    Effect of Air Permeability and Thickness of Foams on Sound Absorption Properties
    Mizue Kakehi, Hiroto Akagi, Hideyuki Uematsu, Shuichi Tanoue
    2021 Volume 33 Issue 10 Pages 371-375
    Published: September 20, 2021
    Released on J-STAGE: October 20, 2021
    DOIhttps://doi.org/10.4325/seikeikakou.33.371
    JOURNAL FREE ACCESS
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    Conventionally, glass wool laminated glass fiber and urethane foam based on polyurethane resin have been used as sound absorption materials. However, the recyclability of glass wool and urethane foam is poor and they cannot independently absorb wideband noise. As a result of past research, it has been clarified that the internal structure of the foam changes from closed-cell foam to opened-cell foam depending on the foaming time. However, the sound absorption mechanism of the foam made under various conditions was unclear because of the complex internal structure of closed-cell and opened-cell foam in foaming. Therefore, in this study, the influence of the surface air permeability and the thickness of foam on sound absorption properties was investigated by using foam with separated internal structures（closed-cell and opened-cell foam）. As a result, it was clarified that sound absorption in the low frequency band becomes wider as the thickness of the foam increases regardless of the foam structure, while in the high frequency band it improves as the air permeability increases.

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