Multi-component sponge
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United States of America Patent
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Jun 24, 1997
Grant Date -
N/A
app pub date -
Jul 11, 1995
filing date -
Jul 11, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-component sponge has a central or main foam layer of reticulated single cell polyurethane flexible foam and an outer foam layer adhered to each of its two substantially parallel sides so that liquid can flow between the main foam layer and the two outer foam layers. Each of the two outer foam layers is preferably polyurethane flexible foam having a reticulated double cell structure although each could be a reticulated single cell structure having a porosity in the range of 3-110 pores per inch. The main foam layer preferably has a porosity in the range of 3-30 pores per inch. Each of the two outer foam layers is softer than the main foam layer.
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