Abstract: The present invention relates to a method and apparatus for laminating two webs of corrugating medium to produce a composite corrugating medium for the manufacture of corrugated fiberboard. The method essentially consists of the steps of (a) applying a coat of a water-soluble adhesive onto one side of at least one web of a first and second corrugating medium; (b) conveying the first and second corrugating medium over the surface of a first heating cylinder such that the water-soluble adhesive is between the first and second corrugating medium to join them together into a loosely bound composite corrugating medium, wherein heat is applied to one surface of said composite corrugating medium through the first heating cylinder; and (c) passing the opposite surface of the composite corrugating medium to a second heating cylinder to subject the composite to a second heating step. The present invention contemplates an apparatus for carrying out this invention.

Abstract: The present invention relates to a method and apparatus for laminating two webs of corrugating medium to produce a composite corrugating medium for the manufacture of corrugated fiberboard. The method essentially consists of the steps of (a) applying a coat of a water-soluble adhesive onto one side of at least one web of a first and second corrugating medium; (b) conveying the first and second corrugating medium over the surface of a first heating cylinder such that the water-soluble adhesive is between the first and second corrugating medium to join them together into a loosely bound composite corrugating medium, wherein heat is applied to one surface of said composite corrugating medium through the first heating cylinder; and (c) passing the opposite surface of the composite corrugating medium to a second heating cylinder to subject the composite to a second heating step. The present invention contemplates an apparatus for carrying out this invention.

Abstract: The present invention relates to a reinforced corrugated board which is specifically reinforced in only those locations where such reinforcing is required in the product produced from this board. The board has a smooth top face or liner and a first corrugated layer adhesively affixed therebeneath. To the bottom of the first corrugated layer, a second corrugated layer is affixed. This second layer is only as large as the area requiring special reinforcing in the final product and need not be as large as the first corrugated layer. A bottom liner or facing is affixed to the second corrugated layer and any of the first corrugated layer which extends around the second layer.An apparatus and method for producing this board sheet are also presented.

Abstract: The present invention relates to a reinforced corrugated board which is specifically reinforced in only those locations where such reinforcing is required in the product produced from this board. The board has a smooth top face or liner and a first corrugated layer adhesively affixed therebeneath. To the bottom of the first corrugated layer, a second corrugated layer is affixed. This second layer is only as large as the area requiring special reinforcing in the final product and need not be as large as the first corrugated layer. A bottom liner or facing is affixed to the second corrugated layer and any of the first corrugated layer which extends around the second layer.An apparatus and method for producing this board sheet are also presented.