Sheet material
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United States of America Patent
Stats
-
Jan 2, 2001
Grant Date -
N/A
app pub date -
Jul 19, 1999
filing date -
Jan 10, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rigid or semi-rigid plastics sheet material comprises a pair of opposed faces (20,22) between which run elongate voids defined by interconnections (24,25) between the two opposite faces, the cross sectional shape of at least some of the voids being a polygon with more than four sides, preferably a repeating pattern of regular hexagons or octagons joined in a line at adjacent sides or apices and including triangular secondary voids therebetween. Advantages include higher strength, lighter weight and faster cooling during the extrusion process.
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