Method and apparatus for the production of polymeric foam
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United States of America Patent
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-
Jul 22, 1986
Grant Date -
N/A
app pub date -
May 15, 1984
filing date -
May 20, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In the production of polymeric foam in particular polyurethane foam slabstock, a mixture of foam reactants is allowed to expand in a closed mould while substantially atmospheric pressure is maintained above the upper surface of the foam. After expansion is completed, air is supplied to the foam upper surface and noxious gases in the foam are removed through one or more apertures in the lower region of the mould. Preferably, the air supplied is dry. Removed gases may be collected for re-cycling. Air may be supplied during foam expansion. Various mould aperture arrangements and means for progressively covering the mould are described.
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