Dryer-cooling machine for producing corrugated doubleface corrugated board

A machine for combining a web of singleface corrugated paper with a web of liner paper to effect an adhesive bond between the flute peaks of the single face web and the surface of the liner web to form doubleface corrugated board, said machine comprising:

• (A) a conveyor to transport the webs through a funnel having a large mouth converging toward a relatively narrow spout in a hold-down zone, the liner web overlying the flutes of the singleface web, said conveyor being constituted by an endless belt whose upper reach passes through said funnel;
• (B) means to force air into the mouth of said funnel and to exhaust the air from the spout thereof at a rate producing a static pressure in the converging region of said funnel above the advancing webs, thereby imposing a force on the liner web to maintain it in intimate contact with the flute peaks which carry lines of adhesive;
• and
• (C) an infrared heater above the upper wall of the funnel, said wall being impermeable to air and being permeable to infrared rays whereby the rays penetrate the region to heat the liner and to effect curing of the adhesive, whereby said hold-down zone also functions as a heating zone, the air passing through the funnel picking up vapors emitted from the drying adhesive and discharging these vapors through said spout.