Porous structural unit and a method of preparing the same
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United States of America Patent
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Apr 28, 1992
Grant Date -
N/A
app pub date -
Oct 31, 1989
filing date -
Oct 31, 1988
priority date (Note) -
Expired
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Abstract
The present invention concerns a method of preparing a porous structural unit comprising a plurality of layers having different specific gravities by pressing and heating a material including resin particles between opposing molds having a temperature difference to thereby cause the fusion or bonding of the resin particles, and a porous structural unit which improves acoustic absorption properties and heat insulation properties and in which the specific gravity is continuously changed.
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