Polyethylene balloon
First Claim
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1. A METHOD OF MANUFACTURING A CONSTANT PRESSURE ALTITUDE METEOROLOGICAL BALLOON OF POLYETHYLENE FILM, COMPRISING THE STEPS OF:
- FORMING A LAY-FLAT PREFORM BY PLACING TWO SHEETS OF POLYETHYLENE IN THE RANGE OF 5 TO 40 MILS THICK EACH TOGETHER AND FORMING A HEAT AND PRESSURE SEALED EDGE SEAM THEREIN HAVING A GENERALLY CIRCULAR CONFIGURATION WITH A NECKED OPENING, SAID POLYETHYLENE HAVING A DENSITY IN THE RANGE OF 0.91 TO 0.96, A TENSILE AT 25*C. OF AT LEAST 500 POUNDS PER SQUARE INCH, AND A FIRST ORDER TRANSITION TEMPERATURE ABOVE 103*C.;
IRRADIATING SAID PREFORM WITHIN THE RANGE OF 8 TO 16 MEGARADS OF HIGH ENERGY IONIZING RADIATION;
HEATING THE IRRADIATED PREFORM TO A WORKING TEMPERATURE IN THE RANGE OF 1 TO 35*C. ABOVE SAID TRANSITION TEMPERATURE;
BLOWING SAID PREFORM BY THE APPLICATION OF INTERNAL FLUID PRESSURE TO THE EXTENT OF AT LEAST 100 PERCENT FILM ELONGATION (AREA INCREASE) AND A FINAL FILM THICKNESS UNDER 5 MILS WHILE MAINTAINING SAID EDGE SEAM AT SAID WORKING TEMPERATURE AND COOLING THE BLOWN SHAPE TO BELOW SAID TRANSITION TEMPERATURE WHILE MAINTAINING INTERNAL FLUID PRESSURE.
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1 Claim
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1. A METHOD OF MANUFACTURING A CONSTANT PRESSURE ALTITUDE METEOROLOGICAL BALLOON OF POLYETHYLENE FILM, COMPRISING THE STEPS OF:
- FORMING A LAY-FLAT PREFORM BY PLACING TWO SHEETS OF POLYETHYLENE IN THE RANGE OF 5 TO 40 MILS THICK EACH TOGETHER AND FORMING A HEAT AND PRESSURE SEALED EDGE SEAM THEREIN HAVING A GENERALLY CIRCULAR CONFIGURATION WITH A NECKED OPENING, SAID POLYETHYLENE HAVING A DENSITY IN THE RANGE OF 0.91 TO 0.96, A TENSILE AT 25*C. OF AT LEAST 500 POUNDS PER SQUARE INCH, AND A FIRST ORDER TRANSITION TEMPERATURE ABOVE 103*C.;
IRRADIATING SAID PREFORM WITHIN THE RANGE OF 8 TO 16 MEGARADS OF HIGH ENERGY IONIZING RADIATION;
HEATING THE IRRADIATED PREFORM TO A WORKING TEMPERATURE IN THE RANGE OF 1 TO 35*C. ABOVE SAID TRANSITION TEMPERATURE;
BLOWING SAID PREFORM BY THE APPLICATION OF INTERNAL FLUID PRESSURE TO THE EXTENT OF AT LEAST 100 PERCENT FILM ELONGATION (AREA INCREASE) AND A FINAL FILM THICKNESS UNDER 5 MILS WHILE MAINTAINING SAID EDGE SEAM AT SAID WORKING TEMPERATURE AND COOLING THE BLOWN SHAPE TO BELOW SAID TRANSITION TEMPERATURE WHILE MAINTAINING INTERNAL FLUID PRESSURE.
- FORMING A LAY-FLAT PREFORM BY PLACING TWO SHEETS OF POLYETHYLENE IN THE RANGE OF 5 TO 40 MILS THICK EACH TOGETHER AND FORMING A HEAT AND PRESSURE SEALED EDGE SEAM THEREIN HAVING A GENERALLY CIRCULAR CONFIGURATION WITH A NECKED OPENING, SAID POLYETHYLENE HAVING A DENSITY IN THE RANGE OF 0.91 TO 0.96, A TENSILE AT 25*C. OF AT LEAST 500 POUNDS PER SQUARE INCH, AND A FIRST ORDER TRANSITION TEMPERATURE ABOVE 103*C.;
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Current AssigneeBeverly A. Nickerson, Charles P. Fazio, John E. Ehrreich
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Original AssigneeBeverly A. Nickerson, Charles P. Fazio, John E. Ehrreich
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InventorsEhrreich, John E., Fazio, Charles P., Nickerson, Beverly A.
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Application NumberUS04/112,430Time in Patent Office1,210 DaysField of SearchUS Class Current244/31CPC Class CodesB29C 49/0005 characterised by the materialB29C 49/0042 without using a mould B29C4...B29C 49/0691 using sheet like material, ...B29C 71/04 by wave energy or particle ...B29K 2023/06 PE, i.e. polyethyleneB29K 2105/24 crosslinked or vulcanisedB29K 2623/06 PE, i.e. polyethyleneB29K 2995/0053 bi-axiallyB29L 2022/022 BalloonsY10T 156/1054 and simultaneously bonding ...
