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AssigneeWeyerhaeuser Company
InventorsArthur Dale Wolvin, Richard Milton Morris, Jr.
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The product is a laminar composite of two or more adhesively bonded layers of sheet material, one of which has a corrugated surface contour at the interface between the layers. The layers are bonded together at the ridges of the corrugated surface of the one layer, and the bond on each ridge consists essentially of a series of relatively localized spots of a plastically deposited but adhesively set adhesive material. The spots are located at intervals spaced apart from one another lengthwise of the ridge, and are characterized with oblate cross sections in planes normal to the interface between the layers, resulting from the fact that the spots undergo compression in the plastic state thereof during the process. The bonding operation is accomplished by causing relative motion between the corrugated web and a series of spaced parallel lines of adhesive material which are disposed crosswise of the ridges of the web and contacted with the ridges so as to deposit the spots thereon.
A method of laminating two or more layers of sheet material, one of which has a corrugated surface thereon and the other of which has a planar surface thereon, comprising passing the corrugated surface defining layer about a carrier roll, generating a pressure differential across the carrier roll to retain the corrugated surface defining layer thereon, rotating the carrier roll in juxtaposition to a series of spaced parallel lines of adhesive that are disposed crosswise of the ridges of the corrugated surface defining layer and contacted with the ridges so as to deposit series of spaced, pressure deformable spots of adhesive along the lengths of the ridges of said layer, and thereafter contacting the planar surface of the other layer with the series of spots on the ridges of the corrugated surface defining layer, pressing the two layers together so that they splay the respective spots into the spaces therebetween and form substantially continuous lines of adhesive along the lengths of the ridges, and bonding the two layers together at the lines of adhesive on the ridges, including at points on the planar surface of the other layer coinciding with the spaces between the spots.
Dependencies are inferred from the claim text.