Patent Number: 6,168,739

Title: Sheet material

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.

Inventors: Moeder; Claudio (Voghera, IT)

Assignee: FRA. MO Snc di Franca Riva & C

International Classification: B29D 24/00 (20060101); B32B 031/00 ()

Expiration Date: 01/02/2018