Feasibility study of EVAL balloons

Yoshitaka Saito, Eiji Kamioka, Michihiko Toriumi, Yukihiko Matsuzaka, Michiyoshi Namiki, Naoki Izutsu, Shigco Ohta, Takamasa Yamagami, Jun Nishimura, Kiyoho Matsushima

研究成果: Article査読


For a new balloon material, we have been studying the properties of an EVAL (Ethylene-Vinyl-ALcohol) film during a part of few years. The EVAL film is a product of Kurare Plastic Company, and has mechanical properties similar to that of a Mylar film. Besides this strong mechanical strength, we found that the EVAL film has several characteristics which seems to be suitable for the balloon material. Those are: 1. Sandwiched EVAL films laminated by polyethylene films can be heat-scaled, 2. Gas leakage through the EVAL film is extremely low, and for Helium gas, it is almost 100 times less than that of a Mylar film, 3. The EVAL film is transparent in the optical band, while it efficiently absorbs the infrared radiation from the earth. In 1997, we have carried out a test flight from the Sanriku Balloon Center using a small balloon with a volume of 1000 m 3 . The balloon reached an altitude of 22 km successfully and showed a maximum burst pressure of 2.1 g/cm 2 . In this paper, basic properties of the EVAL film and performance of the test balloon arc described.

ジャーナルAdvances in Space Research
出版ステータスPublished - 2000

ASJC Scopus subject areas

  • 航空宇宙工学
  • 天文学と天体物理学
  • 地球物理学
  • 大気科学
  • 宇宙惑星科学
  • 地球惑星科学(全般)


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