Porous structural unit and a method of preparing the same

Details Porous structural unit and a method of preparing the same Porous structural unit and a method of preparing the same

1989-10-31

1992-04-28

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

181290, 181294, 4283179, 4283193, 4283197, B32B 326

Patent

active

051088339

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.

REFERENCES:
patent: 3262834 (1966-07-01), Abell et al.
patent: 3709774 (1973-01-01), Kimura
patent: 3718532 (1973-02-01), Hayes, Jr.
patent: 3925526 (1975-12-01), Haas
patent: 4037013 (1977-07-01), Sprague
patent: 4304810 (1981-12-01), Gates et al.

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