Perforated laminate
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United States of America Patent
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Jun 24, 2008
Grant Date -
Oct 21, 2004
app pub date -
Jul 3, 2002
filing date -
Jul 3, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a perforated thermoplastic structure comprising at least a first layer (8) and a plurality of perforations, which extend through the first layer (8). The perforations have a three-dimensional, preferably approximately conical or cylindrical shape (18). A second layer forms an inner surface (20) of the shape (18), whereas the first layer forms an outer surface (21) of the shape (18). The first layer contains a thermoplastic material, whose melting point is lower than a melting point of the thermoplastic material of the second layer.
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