초록 ▼

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 heate

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.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus in which a liner paperboard web is heated and brought into adhering contact with adhesive placed on flutes of a single face paperboard web thereby forming a double face paperboard web, said apparatus comprising:a plurality of heating plates defining a substan

[ What is claimed is:] [1.] An apparatus in which a liner paperboard web is heated and brought into adhering contact with adhesive placed on flutes of a single face paperboard web thereby forming a double face paperboard web, said apparatus comprising:a plurality of heating plates defining a substantially planar heated surface facing a lower surface of said liner paperboard web and a remote surface facing away from said liner paperboard web;a heating element in thermal communication with said heated surface for heating said heated surface;a holddown device positioned above said heated surface for applying pressure against an upper surface of said single face paperboard web;a passageway for receiving said liner paperboard web and said single face paperboard web, said passageway defined between said heated surface and said holddown device;a plurality of ports formed within said heated surface and below said holddown device, said plurality of ports in fluid communication with said passageway;a steam source in fluid communication with said plurality of ports;a steam film produced by said plurality of ports and located in said passageway intermediate said heated surface and said liner paperboard web; andwherein said steam film at least partially lubricates said liner paperboard web from frictional contact with said heated surface by forcing said liner paperboard web away from said heated surface, while simultaneously supplying heat to said double face paperboard web.