Patent ID: 7951258

Claim:
A method for manufacturing a composite layer structure from at least one first and at least one second cover sheet ( 1 , 2 ) and between which a core sheet ( 30 ) is provided which comprises a composition of fibers ( 9 ) and adhesive ( 5 ), wherein the cover sheets and the fibers are made of steel, aluminium or any other metallic materials, or alloys, or ceramics, or any substances or mixtures comprising these materials, said method comprising the following steps: applying the adhesive ( 5 ) onto the at least one first and the at least one second cover sheet ( 1 , 2 ) such that locally varying physical properties of the composite layer structure are achieved by locally applying the adhesive ( 5 ) only onto predetermined specific areas of the first and second cover sheets ( 1 , 2 ) in the form of a pattern comprising cavities or channels which remain free of adhesive ( 5 ) and fibers ( 9 ), or in the form of a non-continuous layer comprising islands of adhesive ( 5 ), such that inherent stresses due to different thermal expansion coefficients of the cover sheets ( 1 , 2 ) are at least substantially avoided; then applying the fibers ( 9 ) onto areas coated with the adhesive ( 5 ) of at least one of the cover sheets ( 1 , 2 ); and joining the cover sheets ( 1 , 2 ) together.