Abstract
Band-sealer machines, which seal long polyethylene-film gores continuously, are used to produce big plastic balloons. The machines are designed to operate in long factories and can not stop sealing in a middle of long gores. This paper describes a new belt-sealer that we have developed for producing big polyethylene balloon. The machine is designed such that it can stop and re-start in any middle point of sealing. The sealer removes handling difficulties of the usual-type band-sealer and can be operated even in factories with small area. A thin polyethylene balloon with a volume of 120, 000 m3 was made by the new type belt-sealer. This balloon (BT 120) was launched successfully on January 27, 1997. The balloon ascended normally and reached the altitude of 50.2 km after 3 hrs.. The altitude is the highest balloon altitude ever in Japan.
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