LIGHTWEIGHT REINFORCED BALLOON MATERIAL INVESTIGATION.
Final rept. for 1 Oct 64-31 Mar 65,
SCHJELDAHL (G T) CO NORTHFIELD MINN
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The leakage of balloons constructed of 0.25-mil Mylar laminated to scrim was determined to be caused by point blocking. Antiblocking agents and modified adhesives were found ineffective. Laminating Mylar to both sides of the scrim prevents blocking, but results in a balloon heavier than desired. Light gage Mylar as received was found to be an acceptable material for zero-pressure balloons. Manufacturing techniques involving minimum handling were found feasible but did not eliminate leakage. A folded-tape sealer was developed and found to substantially increase sealing speed and improve seal quality. Author