Abstract: A short dwell coater apparatus is disclosed for applying coating material onto a web guided by a backing roll. The apparatus includes a coater housing which is disposed in close proximity to the backing roll. The arrangement is such that the web guided by the backing roll moves between the backing roll and the housing. The housing defines an application chamber which is open towards the web and which extends along the web in a cross-machine direction. The application chamber is connected to a source of coating material such that the coating material is applied to the web during movement of the web past the chamber. The coater housing has an upstream lip which is disposed upstream relative to the chamber and adjacent to the web. The lip defines an upstream coating overflow for permitting excess coating material to flow therethrough. A flexible coater metering blade is disposed downstream relative to the chamber.

Abstract: A short dwell coater apparatus is disclosed for the application of coating material to a web which is supported by a backing member. The apparatus includes a housing which is disposed closely adjacent to the backing member such that the web moves between the housing and the backing member. The housing defines an application zone which is connected to a pressurized source of the coating material. The application zone has an open face towards the web. A blade is adjustably secured to the housing and extends from the housing towards the web. The blade defines a downstream extremity of the application zone. A movable flow divider supported by the housing extends into the application zone. The divider has an upstream and a downstream end, with the downstream end being movably disposed in the vicinity of the blade for reducing the size of a flow vortex generated within the application zone due to movement of the web past the open face.

Abstract: Method and apparatus are provided for effectively controlling cross-machine moisture profile in a paper web undergoing processing, such as water-removal via a press nip. A compartmentalized system is provided in close proximity across a section of a traveling web undergoing dewatering whereby select size cross-machine compartments, for example, about 6" in width, are selectively provided with steam and/or air so as to control wet and/or dry streaks along the traveling web so that web areas opposite each compartment can be selectively heated for accentuated moistre removal or cooled for retarded water removal. In preferred embodiments, control of the profiling system occurs with the air of moisture sensors and a computer.

Abstract: Substantially uniform heat transfer through the cylindrical heat transfer wall of a steam heated hollow dryer drum is attained by longitudinal spoiler bars effecting turbulence of condensate throughout a major extent of the inner surface of the heat transfer wall, and condensate turbulence is generated in a narrow annular area from which a stationary siphon intake head withdraws the condensate from the steam chamber. A turbulence promoter is carried by the intake head and may comprise rigid or yieldably supported structure, e.g. a brush, rigid or flexible bar structure, an array of fingers, mounted on the downstream or off-running side of the intake head having regard to the direction of rotation of the drum.

Abstract: A dryer for a papermaking machine including a first heated dryer drum with a second heated dryer drum above the first drum and a turning roll positioned between the first and second drums with a carrying felt threaded over the drums and turning roll with a web being between the drum and felt on each of the drums and on the outer surface of the felt over the roll, with successive third and fourth drums after the first and second drums, with the fourth drum below the third and a turning roll positioned between the third and fourth drums with the web again being directly in contact with the third and fourth drums and on the outside of the felt on the turning roll.

Abstract: A method and mechanism for positive web transfer in a press section of a papermaking machine including an intermediate press nip formed between first and second press members with a porous felt on one surface of the web and a nonporous looped smooth surface belt of nonextensible material impervious to water passing through the nip in direct contact with the other surface of the web so that the web follows the belt downstream of the nip with the web first being pressed between an earlier press upstream of the intermediate press, and the web being removed from the belt following the intermediate press with rewetting of the web on the offrunning side of the intermediate nip due to contact with the impervious belt being eliminated.

Abstract: A steam heated dryer drum for use in a papermaking machine with the drum including a cylindrical rotary hollow drum shell and a structure for removing condensate from the steam from the shell including a conduit leading from inside to outside the shell and an improved structure for receiving the condensate with a siphon tip having a hollow chamber within and an opening facing the inner surface of the dryer shell and closely spaced thereto and a flange at the lead end of the siphon tip with an inclined ram surface and a wall across the center of the chamber in engagement with the inner surface of the shell.

Abstract: A method and mechanism for dewatering a web in a paper making machine having press means, a first thermal dryer section having a long continuous support looped belt carrying the web along a first drying run with rolls and suction zones beneath the web and a hot air generating means for directing a flow of air onto the web in the first thermal run with the web being received substantially 40% bone dry at the beginning of the first thermal run and being delivered substantially 50% bone dry at the end of the run onto a heated drum dryer section.

Abstract: A method and apparatus for drying a traveling fibrous web such as paper including a hollow cylindrical dryer drum with means for directing a flow of steam into the drum and for removing condensate from the inside of the drum and positioning an axially elongate bristle support with bristles projecting radially outwardly so that the support and bristles form a brush of substantial uniform axial density to generate a visual high level of turbulence in the condensate and decrease the rotational speed of the layer of rimming condensate formed on the inner surface of the drum shell.

Abstract: Method and apparatus for drying a moving web utilizing one or more air caps each including an apertured plate together with a high pressure plenum which is arranged to deliver high pressure air through the apertures in the plate to impinge against the web. The geometry of the plates, their spacing from the web and the positioning of exhaust means are correlated to provide a minimum amount of cross flow interference thereby improving the heat transfer and ultimately the efficiency of the drying operation.