Method of preparing a porous structural unit
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United States of America Patent
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Sep 1, 1992
Issued Date -
N/A
app pub date -
Jun 26, 1991
filing date -
Oct 31, 1988
priority date (Note) -
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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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