Patent ID: 6050316
Filing Date: 2000-04-18
Classification: B31F

Abstract:
A heating device for a continuous paperboard web, said heating device comprising:a thermally conductive cylindrical wall extending between opposing end faces and including a heated arcuate outer surface, said cylindrical wall defining a center axis;at least one primary channel extending between said end faces and in thermal communication with said outer surface;a plurality of outlet ports extending through said wall, said outlet ports sealed from said at least one primary channel and in fluid communication with said outer surface, said plurality of outlet ports arranged in a plurality of rows, each said row extending substantially parallel to said center axis and circumferentially offset from adjacent ones of said rows;a first steam inlet port for supplying a first steam to said at least one primary channel;a second steam inlet port for supplying a second steam to said plurality of outlet ports; anda steam film generated by said plurality of outlets ports, said steam film extending circumferentially in contact with at least a portion of said heated outer surface for supporting the paperboard web, thereby reducing frictional contact between the paperboard web and said heated outer surface.