Abstract: A transfer apparatus is disclosed for transferring a tail of a web from a press roll to a dryer of a dryer section. The apparatus includes a lead-in roll which is disposed adjacent to and spaced relative to the press roll for leading the tail of the web from the press roll towards the dryer. A dryer felt extends around the lead-in roll and from the lead-in roll to the dryer such that the tail is supported by the felt from the lead-in roll to the dryer. The felt and the dryer define therebetween a positive air pressure in-going nip.

Abstract: A ventilating roll for introducing a supply of relatively dry air into the pocket spaces between dryer rolls and the co-running fabrics and paper web in a papermaking machine, and removing the relatively moist air which is liberated from the traveling paper web as it comes into contact with the heated dryer rolls. The ventilating roll has a plurality of separate compartments, some of which conduct super-atmospheric pressure air into the pocket spaces, and some of which conduct sub-atmospheric air out of the pocket spaces. The compartments conducting air into the roll alternate with the compartments for conducting air out of the roll. The temperature of the internal structure of the roll is thereby balanced circumferentially about the center shaft of the roll and thermal bowing of the roll is kept to a minimum.

Abstract: An apparatus is disclosed for cutting a tail from a web extending from a single tier dryer section to a further single tier dryer section. The apparatus includes a last dryer of the dryer section and a dryer felt extending around the last dryer such that the web is disposed between the dryer felt and the last dryer for drying a second side of the web. A last felt roll is disposed downstream relative to the last dryer such that the felt extends around the last felt roll. A first dryer of the further dryer section is disposed downstream relative to the last dryer and a first felt roll is disposed between the last dryer and the first dryer. A further felt extends around the first felt roll and the first dryer such that the web extends in open draw between the last dryer and the first dryer and thereafter around the first dryer between the further felt and the first dryer for drying a first side of the web. A tail cutter is disposed adjacent to the web for cutting a tail from the web in the open draw.

Abstract: A transfer apparatus is disclosed for transferring a web from a press nip to a dryer section. The apparatus includes a backing roll and a press member which cooperates with the backing roll for defining therebetween the press nip. A press blanket extends through the press nip such that the web is disposed between the blanket and the backing roll during passage of the web through the press nip. A backing drum is disposed downstream relative to the press nip such that the blanket and the web extend contiguously relative to each other from the press nip to the backing drum. A dryer felt cooperates with the backing drum such that the web is disposed between the blanket and the felt during passage of the blanket, web and felt around the backing drum and a transfer mechanism is disposed adjacent to the backing drum for transferring the web without an open draw from the blanket to the felt such that the web follows the felt through the dryer section.

Abstract: An apparatus is disclosed for drying a web of paper emerging from a press section of a papermaking machine. The apparatus includes a first dryer section for transferring the web from the press section to the first dryer section. A second dryer section is disposed downstream relative to the first dryer section for initiating the drying of a second side of the web. A first dryer transfer means transfers the web without open draw between the first and the second dryer sections. The first dryer transfer includes a downstream vacuum roll, a downstream felt roll and a felt extending between the downstream vacuum roll and the downstream felt roll such that the web is conveyed and disposed between the felt and the second dryer section.

Abstract: A tail cutter apparatus is disclosed for cutting a tail from a web extending through a single tier dryer section. The apparatus includes a dryer of the drying section and a felt extending contiguously with the web around the dryer, the web being disposed between the felt and the dryer for drying the web. The further dryer is disposed downstream relative to the dryer and the felt and web extend contiguously around the further dryer with the web being disposed between the felt and the further dryer for further drying the web. A felt roll is disposed downstream relative to the dryer and upstream relative to the further dryer for guiding the felt during movement of the felt between the dryer and the further dryer. A guide roll is disposed downstream relative to the dryer and upstream relative to the further dryer for guiding the web during movement of the web away from the towards the felt roll such that a first and second open draw of the web are defined between the felt roll and the guide roll.

Abstract: A single tier dryer section apparatus is disclosed for drying a web extending through a paper machine. The apparatus includes a first dryer and a dryer felt extending around the first dryer such that the web is disposed between the felt and the first dryer for drying the web. A vacuum transfer roll is disposed downstream relative to the first dryer such that the web and felt extend contiguously from the first dryer to and around the transfer roll so that the felt is disposed between the web and the roll during transit of the web and felt around the roll. A second dryer is disposed downstream relative to the transfer roll such that the web and the felt extend contiguously from the transfer roll to and around the second dryer so that the web is disposed between the felt and the second dryer during transit of the web and the felt around the second dryer.

Abstract: A dryer section apparatus is disclosed for drying a web. The apparatus includes a first and second tier of dryers which include, respectively, a first, second dryer and a third dryer. The arrangement is such that the web moves from the first dryer towards and around the third dryer and subsequently to and around the second dryer. A transfer roll is disposed between the first, second and third dryers such that the distance between the transfer roll and the first dryer is less than the distance between the transfer roll and the second dryer. A dryer felt extends contiguously with the web around the first dryer with the felt then extending around the transfer roll and thereafter around the second dryer such that a pocket is defined between the web extending between the dryers, the third dryer and the felt.

Abstract: A guide roll apparatus is disclosed for guiding a contiguous web and web-supporting felt through a drying section of a paper machine. The apparatus includes a rotatable guide roll having an outer cylindrical surface defining a first and a second edge portion and a central portion disposed between the edge portions. The first edge portion defines a first plurality of air flow channels such that in use of the apparatus, when the web and felt are guided around the rotatable guide roll, air entrapped between the first edge portion and the felt wrapped around the first edge portion is permitted to flow through the first plurality of channels away from the felt so that fluttering of the web during guidance around the first edge portion is inhibited.

Abstract: A press drying apparatus is disclosed for removing excess water from a formed web by the simultaneous application to the web of elevated temperature and pressure for a prolonged period of time. The apparatus includes a frame and a heated roll rotatably supported by the frame. A shoe is connected to the frame with the shoe cooperating with the heated roll for defining therebetween a first nip for the passage therethrough of the web. A deflection controller is connected to the frame with the controller cooperating with the heated roll for defining therebetween a second nip. The second nip is disposed diametrically opposite to the first nip such that when the web extends through the first nip and the heated roll is heated, deflection of the heated roll towards the second nip is compensated for by the deflection controller.

Abstract: An insulating apparatus is disclosed for thermally insulating a dryer head journalled in a dryer section of a papermaking machine. The apparatus includes a stationary insulator having a disc-shaped configuration. The insulator defines a central bore for the rotatable reception therein of the journal. A peripheral seal extends circumferentially around the insulator for inhibiting the flow of convection currents past the periphery of the insulator thereby reducing thermal losses through the head.

Abstract: A dryer apparatus is disclosed for drying a web extending through a dryer section of a paper machine. The apparatus includes a first and a second dryer. A dryer felt movably extends around the dryers such that the web is disposed between the dryers and the felt for drying the web. A vacuum transfer roll is disposed downstream relative to the first dryer and upstream relative to the second dryer such that the web and the felt extend around the transfer roll so that the felt is disposed between the web and the transfer roll when the web and the felt move around the transfer roll. A seal device extends between the first and the second dryers for reducing a flow of air between the first and the second dryers into a pocket defined by the transfer roll and the felt extending between the dryers and the transfer roll.

Abstract: A transfer apparatus is disclosed for transferring a web from a press section to a first dryer of a dryer section. The apparatus includes a lead-in roll which is disposed closely adjacent to the press section. A felt extends around the lead-in roll and from the lead-in roll to the first dryer such that the web extends in an "open draw" from the press section to the lead-in roll and is thereafter supported by and beneath the felt towards a dryer nip defined between the felt and the first dryer. A vacuum generating device is disposed adjacent to the dryer nip such that the web and the felt are disposed between the vacuum generating device and the first dryer. The web is disposed between the felt and the first dryer, and the vacuum generating device induces a partial vacuum in the vicinity of the nip so that wrinkling and breakage of the web as the web approaches the nip is inhibited.

Abstract: In a calendering apparatus for hot-calendering a paper web, the apparatus includes a rotatable calendering roll defining a smooth calendering surface. A backing roll rotatably cooperates with the calendering roll for defining therebetween a calendering nip for the passage therethrough of the web. An induction heater is disposed in close proximity to the calendering surface nip for inducing eddy currents within the calendering roll such that the calendering roll is heated. A blow box is disposed in close proximity to the calendering surface and between the heater and the nip. The blow box defines a plurality of compartments which are disposed in a cross-machine direction. Each of the compartments selectively blows a current of cooling air against the calendering surface for controlling the temperature of the calendering surface so that the temperature of the calendering surface adjacent to the nip is controlled in a cross-machine direction.

Abstract: A web transfer apparatus is disclosed for transferring a web from a press section to a dryer section. The transfer apparatus includes a dryer fabric extending around the dryer section for conveying the web from the press section to, and around, the dryer section so that excess water remaining in the web after the press section is removed from the web when passing through the dryer section. A first plurality of rotatable rolls movably support the dryer fabric and a frame rotatably supports the first plurality of rolls. The first plurality of rolls includes a lead-in roll which is disposed adjacent to the press section for guiding the web from the press section towards the dryer section. The first plurality of rolls also includes a first transfer roll which is spaced relative to the lead-in roll for guiding the web through the dryer section.

Abstract: An apparatus is described for maintaining a first and second lateral edge of web in close conformity with a dryer felt of a papermaking machine. The apparatus includes a first dryer drum which is rotatable about an axis which is parallel to the cross-machine direction of the web. A second dryer drum is rotatable about an axis which is spaced and parallel relative to the axis of the first dryer drum. An intermediate transfer roll has an axis of rotation disposed in a plane parallel to, and between, the axes of the first and second drums such that the web and the felt extend contiguously around the first dryer drum and then around the transfer roll and subsequently around the second drum in a serpentine configuration so that the transfer roll and the felt define therebetween a pocket.

Abstract: Extended nip presses for papermaking machines and the like are provided with electromagnets immediately adjacent the press nip to create or augment the nip pressures or loads. The electromagnets have massive, wide large areas, establishing a concentrated magnetic field between conforming opposite sides of the entire nip area eliminating gaps heretofore encountered in magnetic presses. Non-magnetic belts convey wet webs through the nips of dewatering presses and dry web calendering presses can have the webs directly engage a calender roll conveying the web through the nip.

Abstract: A control apparatus for controlling the differential pressure between steam inlet and outlet lines of a web dryer and includes a selectively controllable outlet valve disposed in the outlet line for selectively controlling the flow of blow-through steam, condensate and non-condensible gases out of the dryer. A dryer speed sensor generates a first control signal and a condensing rate sensor senses the rate at which a layer of condensate builds up within the dryer. The condensate rate sensor generates a second control signal. A control device is operably connected to an outlet valve actuator for selectively energizing the actuator in response to the first and second control signals. The control device compares the signals to determine the optimum relative setting of the outlet valve so that flooding of the dryer with condensate is inhibited while the differential pressure between the inlet and outlet lines is maintained as low as possible.

Abstract: An apparatus is disclosed for assisting the transfer of a web disposed contiguous relative to a transfer felt such that the web is transferred from a lead-in roll disposed adjacent to a press section to a first dryer of a papermaking machine dryer section. The apparatus includes an intermediate support roll disposed between the lead-in roll and the first dryer such that the transfer felt is disposed between the web and the intermediate roll. A first transfer box is disposed between the lead-in roll and the intermediate roll such that the transfer felt is disposed between the web and the first transfer box. The first transfer box is oriented relative to the transfer felt such that a partial vacuum is generated between the first box and the transfer felt for drawing the web into close conformity with the transfer felt between the lead-in roll and the intermediate roll.

Abstract: A blow box (40) is disclosed which is disposed within a pocket (26) defined by a web (W) and felt (F) travelling together from a first dryer (12) to and around a second dryer (14) and onto and around a third dryer (16). The blow box (40) includes a wedge-shaped box extending from between the first and third dryers (12 and 16) to adjacent the second dryer (14), the box (40) being connected to a source of pressurized air (42) for maintaining the web (W) in close conformity with the felt (F) when the web and felt diverge relative to the first dryer (12). The box (40) defines an orifice (44) which is disposed adjacent to the first dryer (12) for directing pressurized air against the felt and then redirecting the air in a direction opposite to the direction of rotation of the first dryer (12) such that the web is urged against the felt for inhibiting the tendency of the web to adhere to the first dryer (12) when the felt diverges relative to the first dryer (12).