Process and installation for the production of stiff recyclable sandwich-type polymeric panels, without the use of adhesives, and the panel produced
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United States of America Patent
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Dec 31, 2013
Grant Date -
Aug 26, 2010
app pub date -
Jul 24, 2008
filing date -
Jul 27, 2007
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Abstract
The present invention describe a process and an installation for the production of stiff recyclable sandwich-type polymeric panels, preferably polypropylene-based panels, and the panel obtained, comprising three lines, in one of which a polymeric polypropylene-based foamed core is produced by extrusion (line A); the structural skins are produced in a second line (line B), which skins are formed by a polypropylene-based lamina reinforced with wood fiber, on which lamina there is applied an also polypropylene-based surface coating layer reinforced with glass fibers; in the third line the structural skins produced in line B are adhered by heat and pressure to the foamed core produced in line A. The sandwich panel produced has a thickness between 7 and 40 mm, an overall density of 400-700 kg/m3 and an elastic modulus of 5-10 GPa.
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