Laminated structure with low density core

Claim 1

A LAMINATED STRUCTURE COMPRISING AT LEAST ONE SKIN OF HARDENED PLASTIC MATERIAL AND A CRISSCORSS CORE DISPOSED ON ONE SIDE OF THE SKIN, THE COMPRISING A PLURALITY OF CORRUGATED ELGONATED METAL STRIPS DISPOSED SIDE BY SIDE IN PLANES PARALLEL TO EACH OTHER AND SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF THE SKIN, THE CORRUGATIONS OF THE STRIPS BEING DISPOSED AT ACUTE ANGELS TO THE LENGTH WISE EXTENT OF THE STRIPS AND THE CORRUGATIONS OF ADJOINING STRIPS BEING OPPOSITELY INCLINED SO THAT THE CORRUGATIONS OF THE ADJOINING STRIPS CROSS EACH OTHR, THE PEAKS OF SAID CROSSING CORRUGATIONS BEING SECURED TO THE VALLEYS OF THE CORRUGATIONS OF THE ADJOINING STRIPS, THE CORRUGATIONS OF THE STRIPS HAVING SHAPR END EDGE PORTIONS THAT ARE DISPOSED IN THE PLANES OF THE CORRUGATIONS ON AT LEAST THE SKIN SIDE OF THE CORE, SAID END EDGE PORTIONS BEING DISPOSED AT ACUE ANGLES TO THE PLANE OF THE SKIN AND THE END EDGE PORTIONS OF THE OCRRUGATIONS OF ADJOINING STRIPS BEING OPPOSITELY INCLINED, SAID INCLINED END EDGE PORTIONS BEING EMBEDDED A SUBSTANTIAL DEPTH IN THE HARDENED PLASTIC MATERIAL OF THE SKIN SO THAT THE MATERIAL OF THE SKIN GRIPS SAID OPPOSITELY INCLINED END EDGE PORTIONS TO LOCK THE SKIN TO THE CORE, MOST OF THE LENGTH OF EACH CORRUGATION BEING FREE FROM CONTACT WITH THE MATERIAL OF THE SKIN.