Abstract: A suction transfer device located over a length of a single continuous dryer fabric extending between two rolls and below which length the web to be dried extends, with the device producing preferential negative pressure in active sections at the edges of the fabric with relation to a relatively inactive central section between said active sections.

Abstract: Disclosed is an apparatus for providing a shower of fog onto a web or a machine component in contact with a web. The fog, which has a temperature lower than the temperature of the surface of the web or the machine component to be cooled, is applied to the surface and is caused to evaporate by the difference in the temperatures. A supply of dry air is supplied to transport the evaporated fog from the region adjacent the surface to be cooled. Fog may be generated through the use of an air-atomizing nozzle which propels water and compressed air through a small orifice under pressure to create an atomized mist or fog. In one embodiment, the fog may also be supplied in controlled specified quantities locally as required to provide for a controllable fog application rate across the full apparatus width.

Abstract: A doctoring apparatus employs a doctor blade having a length greater than the face length of the surface being doctored. A blade holder applies an intermediate portion of the blade to the doctored surface. The blade is movable longitudinally through the blade holder, and has continuing portions extending beyond the ends of the holder. At least one clamp acts on one of the continuing blade portions. The clamp is adjustable between a closed setting preventing relative movement between it and the blade, and the open setting permitting such relative movement. A drive reciprocates either the blade holder or the clamp in one direction when the clamp is closed and in the opposite direction when the clamp is opened, thereby causing the blade to move incrementally in one direction across the surface being doctored.

Abstract: Disclosed is an apparatus for providing a shower of fog onto a web or a machine component in contact with a web. The fog, which has a temperature lower than the temperature of the surface of the web or the machine component to be cooled, is applied to the surface and is caused to evaporate by the difference in the temperatures. A supply of dry air is supplied to transport the evaporated fog from the region surrounding the surface to be cooled. Fog may be generated through the use of an air-atomizing nozzle which propels water and compressed air through a small orifice under pressure to create an atomized mist or fog. The fog may also be generated through the use of an ultrasonic transducer which expels fine droplets of water from its surface by means of a high-frequency oscillating transducer motion. In one embodiment, the fog may also be generated in controlled specified quantities locally at each nozzle as required to provide for a controllable fog application rate across the full apparatus width.

Abstract: Disclosed is a steam-shower apparatus and method including a supply of steam which is fed through a Coanda nozzle and along a path running parallel with one surface of the apparatus. The sheet to which the steam is to be applied runs parallel to this same surface of the machine, but in a direction opposite to the direction of the flow of steam. The sheet travels along a path spaced slightly from the surface of the machine, and the flow of steam runs the entire length of this surface heating the sheet as it flows in the opposite direction. The apparatus may be divided into several sections so that the sheet may be profiled along certain regions which are defined by these sections. In addition, means are included for altering the volume of flow to any one of the particular sections.

Abstract: An assembly for use at the nip between a dryer fabric and a dryer bottom roll at a location at which the fabric moves onto the roll and at which the web to be dried is outside the fabric. A shroud having first and second walls which diverge from a nose is assembled with a plenum chamber body having downwardly converging walls with an opening between the lower ends. The upper edge of one wall of the shroud is secured to one wall of the body to form a first plurality of orifices with the nose of the shroud below the opening and with the other wall of the shroud extending upwardly along and in spaced relation to the other wall of the body. One edge of a baffle extending across the body opening is secured to the one wall of the shroud with the other edge of the baffle connected to the other body wall at a location below the upper end of the other shroud wall to form a second line of orifices.

Abstract: A finger-type doctor blade holder has a plurality of pressure fingers spaced along the underside of a loading plate. A doctor blade is removably supported in recesses defined between the pressure fingers and the loading plate, and the pressure fingers are mounted for pivotal movement about an axis extending across the surface to be doctored. A flexible loading tube is located alongside the finger pivot axis in a tube tray, and a force transmitting member is interposed between the pressure fingers and the loading tube. The rigidity of the force transmitting member prevents upward bulging of the loading tube between the pressure fingers, and the surface of the loading tube is indented by either the force transmitting member or a separate member at the base of the tube tray. The indentation in the tube surface enables the tube to act as a rolling diaphragm when compensating for variations in the distance between the pressure fingers and the base of the tube tray.

Abstract: For use in a doctor blade holder or the like, a self-compensating support element consisting of a hollow elongated flexible tube filled, except for the end regions thereof, with an incompressible liquid. Pliable inserts are received in the tube end regions, and tubular metal sleeves are swaged onto the tube end regions and the inserts received therein. The tube end regions are thus tightly clamped between the inserts and the thus swaged sleeves to seal against the escape of liquid from the tube ends.

Abstract: A unique nozzle assembly (11, 12) is provided for placement within the chamber (4) of a web dryer (1) and closely adjacent a housing web slot (5, 6). The nozzle assembly generally comprises a Coanda-type nozzle (27) and a supplemental nozzle (33) disposed on the assembly so that it is positioned between the Coanda nozzle and the housing wall (3). Both the Coanda and supplemental nozzles are supplied with air from a common manifold (13) connected to an external air source. An air flow control device (34, 35) is provided for the individual air flow paths in the assembly to suitably balance the velocities of the two discharging air jets. To prevent any transient air currents inside the dryer chamber from causing web or air flow instability, a seal (43) is provided between the improved nozzle and the dryer housing wall. The seal is disposed along the head end of the nozzle; that is, closely adjacent the nozzle jet discharge ports.