Apparatus for producing composite corrugating media for the manufacture of corrugated fiberboard and method of making same

An apparatus for the manufacturing of corrugated fiberboard using a composite corrugating medium made from the lamination of two webs of corrugating medium with a water-soluble adhesive comprising:

• (a) a first and second mill roll stand to supply a source of a first and a second web of a corrugating medium, respectively,
• (b) a rod-coating unit for applying a coating of the water-soluble adhesive to the first web of corrugating medium, said coating unit being located in advance of the first mill roll stand for receiving the first web of corrugating medium;
• (c) a suction-brake unit located between the first mill-roll stand and said rod-coating unit to provide tension for said first web of corrugating medium;
• (d) a wire-wound rod unit located in advance of said rod coating unit to smooth the coating of adhesive applied to said first web of corrugating medium and to wipe off any excess adhesive so as to form a film of uniform thickness;
• (e) a regulating roller device located between said wire-wound rod and rod-coating unit to adjust the pressure of contact between the first web of corrugating medium and said wire-wound rod;
• (f) a first heating cylinder, wherein the first and second webs of corrugating medium are brought into contact with each other on the surface of said first heating cylinder and laminated through said water-soluble adhesive to form a loosely bound composite corrugating medium having first and second surfaces, said first heating cylinder providing heat to heat said first surface of said laminated composite corrugating medium;
• and
• (g) a second heating cylinder which receives the loosely bound composite medium from the first heating cylinder in such a manner that said second and opposite surface of said laminated corrugating medium is in contact with the second heating cylinder so that said first and second surfaces of said laminated composite corrugating medium are heated by the first and second heating cylinders, respectively.