Laminated materials

A laminated material adapted to be subjected to a flow of relatively cool fluid across one of its outer surfaces and to a flow of hot fluid across the other of its outer surfaces, said laminated material comprising:

• two sheets spaced apart to define an area for the flow of a cooling fluid there-between in generally the same direction as the flow of the hot and cool fluids across the outer surfaces of the laminated material, one of said sheets which is subjected to the cool fluid across its outer surface having a plurality of spaced perforations so that portions of the cooling fluid flowing across its outer surface can enter into the area between said sheets and flow therebetween in the same general single predetermined direction as the hot and cool fluids flowing across the outer surfaces of the laminated material and the other of said sheets being imperforate to the flow of fluid, a plurality of heat conductive portions connecting said two sheets and abutting said sheets between the perforations in a downstream direction of the perforations, said heat conductive portions being shaped to deflect cooling fluid entering the area between the sheets through any of said perforations into said general single predetermined direction and said conductive portions being further positioned in front of perforations to guide cooling fluid flowing between said sheets away therefrom whereby cooling fluid entering therethrough between said sheets is undisturbed by cooling fluid entering previously through other perforations.