Method of densifying open-celled polyurethane material
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United States of America Patent
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Oct 14, 1980
Issued Date -
N/A
app pub date -
May 31, 1979
filing date -
Feb 10, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of densifying open-celled polyurethane foam is provided in which heated air at a temperature between about 425.degree. F. and 460.degree. F. is circulated through a mass of the foam so as to rapidly and uniformly raise the temperature of the mass to between about 365.degree. F. and 435.degree. F., the mass is then compressed to a desired thickness while its temperature is maintained between 365.degree. F. and 435.degree. F., and the mass is then immediately permitted to cool.
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