Importance

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Abstract

An apparatus and related method for forming a double face paperboard web are disclosed. The apparatus of the present invention includes a heating section upstream from a drawing section. The heating section includes at least one heating plate having an upper surface facing a paperboard web and heated by a plurality of primary channels supplied with steam. A plurality of secondary channels extend through the heating plate intermediate the primary channels and a lower surface of the plate. A plurality of outlet ports communicate with each secondary channel and the upper surface of the heating plate. Steam supplied to the secondary channels exits through the outlet ports thereby producing a steam film between the upper surface of the heating plate and the lower surface of the paperboard web. The steam film substantially reduces frictional forces opposing movement of the web while also dramatically increasing the heat transfer to the paperboard web and accelerating the gelatinization of the glue therein. A weight blanket is provided for exerting pressure against the upper surface of the web. A plurality of fluid ports are formed within the weight blanket for producing a steam film between the weight blanket and the web for, again, reducing frictional contact with the web while improving heat transfer thereto.

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First Claim