Heater for a double facing corrugating machine

In an apparatus for the manufacture of double face corrugated board, where the apparatus includes means to first produce a single face corrugated board from a medium paper and a first liner paper, receive and precondition the single face corrugated board and a second liner paper, and merge the single face corrugated board and second liner paper together with adhesive applied therebetween, a heating means for gelatinizing the single face corrugated board and second liner paper together, comprises:

• a plurality of heating plates aligned side-by-side in a longitudinal array, each plate having an upper and lower surface extending between end faces of the plate, a plurality of channels extending through the plates between the end faces, the channels being parallel to and proximate the upper surfaces of the plates, thereby forming a thin web of material between the channels and the upper surfaces, and a thick web of material between the channels and the lower surfaces to rigidify the plates, the channels being integrally formed in each plate and each plate being interconnected to form a serpentine path circulating through each of the plates, each of the plates further comprising a steam inlet port and a steam outlet port in their lower surface and communicating with the serpentine path to provide a supply of circulating steam to the serpentine path;
• and
• at least some of said discrete plates comprising means for imparting a force on said cardboard as it passes said upper surface, said imparting means being capable of supporting the cardboard above said upper surface and also being capable of securing said cardboard against said upper surface;
• said upper surface of said plate being in direct operative relationship with said cardboard as it passes over said upper surface;
• said imparting means comprising air passages in said discrete plate communicating between the upper and lower surfaces, intermediate some of the channels;
• each of said discrete plates lies in a first plane and comprises a pair of strengthening ribs secured to said lower surface, said strengthening ribs each lying in a second plane which is generally perpendicular to the first plane, said pair of strengthening ribs each having at least one steam passage therethrough and interconnected to the serpentine path in order to heat the strengthening ribs to facilitate minimizing distortion of said plate, said pair of strengthening ribs forming side walls of a chamber which cooperate with said air passages to support said corrugated cardboard either above said upper surface or against said upper surface.

In an apparatus for the manufacture of double face corrugated board, where the apparatus includes means to first produce a single face corrugated board from a medium paper and a first liner paper, receive and precondition the single face corrugated board and a second liner paper, and merge the single face corrugated board and second liner paper together with adhesive applied therebetween, a heating means for gelatinizing the single face corrugated board and second liner paper together, comprises:

• a plurality of heating plates aligned side-by-side in a longitudinal array, each plate having an upper and lower surface extending between end faces of the plate, a plurality of channels extending through the plates between the end faces, the channels being parallel to and proximate the upper surfaces of the plates, the channels being integrally formed in each plate and each plate being interconnected to form a serpentine path circulating through each of the plates, at least some of the plates having vents extending between the upper and lower surface between adjacent channels, each plate further comprising an inlet port and an outlet port communicating with the serpentine path;
• at least some of said heating plates comprising means for imparting a force on said cardboard as it passes said upper surface, said imparting means being capable of supporting the cardboard above said upper surface and also being capable of securing said cardboard against said upper surface;
• said upper surface of said plate being in direct operative relationship with said cardboard as it passes over said upper surface;
• said imparting means comprising air passages in said discrete plate communicating between the upper and lower surfaces, intermediate some of the channels;
• said plates lying in a first plane and comprises a pair of strengthening ribs secured to said lower surface, said strengthening ribs each lying in a second plane which is generally perpendicular to the first plane, said pair of strengthening ribs each having at least one steam passage therethrough and interconnected to the serpentine path in order to heat the strengthening ribs to facilitate minimizing distortion of said plate, said pair of strengthening ribs forming side walls of a chamber which cooperate with said air passages to support said corrugated cardboard either above said upper surface or against said upper surface.