A card sheet including a top material having punched lines, the front side of the top material being printable. A carrier material of at least one polymer layer is directly applied as by extruding to the back side of the top material. The polymer has a stress-at-break in the range of 10 to 30 MPa and...http://www.google.es/patents/USRE43165?utm_source=gb-gplus-sharePatente USRE43165 - Card sheet construction
