Patent ID: 6089296
Filing Date: 2000-07-18
Classification: B31F

Abstract:
In a single facer, providing a preconditioning apparatus for a medium web prior to fluting the medium web for manufacturing corrugated paperboard, wherein the preconditioning apparatus comprises:a hot plate assembly having a heat transfer contact area containing one or more heated surfaces on a bottom of the hot plate assembly;a steam chamber wall structure extending along the bottom of the hot plate assembly to provide a steam chamber adjacent the heat transfer contact area, the steam chamber wall structure containing a web inlet through which the medium web enters the steam chamber and a web outlet through which the medium web exits the steam chamber; anda steam inlet for providing a flow of steam into the steam chamber, wherein the steam flowing into the steam chamber provides sufficient pressure and velocity against a lower side of the medium web to maintain an upper side of the medium web against the heat transfer contact area on the hot plate assembly as the medium web passes through the apparatus.