Light weight board of improved mechanical strength and manufacture thereof
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Dec 5, 1995
filing date -
Dec 5, 1995
priority date (Note) -
Expired
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Abstract
An extruded hollow plastic board is described which has a pair of flat and parallel sheets spaced apart and interconnected by longitudinally extending ribs. The ribs and sheets are connected with rounded joint areas, which significantly improve the mechanical properties and solve undercut and die line problems existing with prior art hollow plastic boards. This invention also provides a method for the manufacture of the hollow board of thermoplastic resin thereof.
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