초록 ▼

An apparatus for preconditioning a medium web on a corragator before fluting the medium web during the manufacturing process of corrugated paperboard uses steam flows and pressures to press the medium web against a hot plate assembly. A plurality of elongated steam showers are located within a steam

An apparatus for preconditioning a medium web on a corragator before fluting the medium web during the manufacturing process of corrugated paperboard uses steam flows and pressures to press the medium web against a hot plate assembly. A plurality of elongated steam showers are located within a steam chamber secured to the preconditioning apparatus. The steam chamber wall structure includes a sealed web inlet and sealed web outlet for the medium web. The velocity and pressure (e.g., average steam pressure within steam chamber approximately 0.1 to 0.3 psi) of steam injected into the steam chamber holds the medium web against hot plates to promote heat transfer from the hot plates to the medium web. In addition, the medium web is heated directly by the latent heat of steam condensation, and also moistened directly by the condensation of the steam. A vacuum may or may not be used to increase the pressure of the medium web against the hot plates.

대표청구항 ▼

[ We claim:] [1.] 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

[ We claim:] [1.] 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.