Abstract: A dewatering box cover including a main body having a leading edge, a trailing edge opposite the leading edge, a first edge, a second side edge opposite the first side edge, a top surface, and a bottom surface. A first slot is formed within the main body having a first portion and a second portion angled relative to the first portion so as to form a V-shape. A plurality of second slots are formed within the main body at both sides of the first slot. The second slots and the first and second portions of the first slot extend from the top surface to the bottom surface of the main body at an angle relative to horizontal of 30° to 70° and at an angle relative to vertical of 20° to 45°.

Abstract: An adjustable resilient blade support for use in the forming section of a papermaking machine. The blade support is adjustable, both to allow the attached blade to be moved from a position where it is out of contact to a position where it is pressed into contact with the adjacent forming fabric, and to permit adjustment of the blade orientation relative to the surface of the forming fabric. The blade support is also resilient, and thus allows the blade to respond to transient localized changes in the path of the forming fabric with which it is in contact. The adjustable resilient blade support of this invention is thus of use in an open surface forming section, and also is of use in forming sections in which two forming fabrics are used.

Abstract: A method and an apparatus for web threading in a drying section of a paper machine or the like. A leader (24) and a so called run-down strip are formed by cutting in the web coming to the drying cylinder in the drying section. An underpressure box (18) is arranged at the opening gap between the drying cylinder (14) and the drying wire, on that side of the wire which is away from the web, whereby this box can direct against the web an underpressure which is controllable in the machine's cross direction. The underpressure box creates an underpressure region (34?) between the leader and the underpressure box, the region having an underpressure p1 at the detachment point, i.e. in the area where the wire is detached from said drying cylinder (14), which underpressure is sufficient to detach the leader from said drying cylinder.

Abstract: The present invention is a machine for manufacturing a fibrous web from a fibrous suspension, with a sheet forming area that exhibits at least one suction box, which includes a main box with at least one suction box cover that is formed from at least two drainage elements that run laterally to the machine's running direction, border a suction slit, and each has one main body and at least one ceramic. The present invention is identified by the fact that at least one drainage element and/or one format slide exhibit at least one removable edge piece in which is integrated at least one temperature sensor in order to measure the temperature in the ceramic and/or the temperature at an adhesive point between the ceramic and the associated main body and/or the temperature in the main body. The present invention is furthermore a process and a system for monitoring a drainage element.

Abstract: A process, and an apparatus, for improving sheet properties in a twin fabric paper making machine forming section whereby pressure pulse generation in the stock can be controlled. The pressure pulses are controlled by mounting a vacuum assisted skimmer blade (15) supported by an adjustable resilient support means (18) so that its height can be altered, and so that it can respond to transient changes in the stock layer thickness. The resilient and adjustable support means (18) itself is supported by a vacuum drainage box (10), which serves to capture at least the major proportion of the fluid skimmed of by the skimmer blade (15). This apparatus the position of the skimmer blade (15) to be altered in two ways without stopping the paper making machine. The skimmer blade (15) can be located either so that it is out of contact with the forming fabric (3), or so that it can be in contact with the forming fabric.

Abstract: Suction device and process for at least one of conditioning and drainage of an endless felt. The device includes a housing having at least one vacuum chamber, and a plurality of suction slits located on a suction surface of the housing that is adapted to face the endless felt. The plurality of suction slits are oriented to extend at least one of in and obliquely to a travel direction of the endless felt. The process includes guiding the endless belt over a suction surface of a vacuum chamber, and suctioning a surface of the endless belt with a plurality of suction slits located in the suction surface of the vacuum chamber. The plurality of suction slits extend in a direction that is at least one of in and oblique to a belt travel direction.

Abstract: A machine for manufacturing a continuous material web, in particular a paper or cardboard web, with at least one perforated cylinder sleeve and a suction roll exhibiting a manhole around which the material web is guided preferably with the aid of a transport band, whereby the interior of the suction roll can be put under a vacuum and is subdivided into at least two sections by a partition wall that is arranged essentially perpendicular to the rotation axis of the suction roll, wherein the partition wall is subdivided into sections and/or is manufactured of a flexible material and can thereby be inserted through the manhole and into the roll interior.

Abstract: A suction box for a machine for manufacturing a fiber web extends transverse to the travel direction of a porous belt and applies suction to the belt and the fiber suspension on the belt. The suction box has an open side toward the belt. At least two and more usually a plurality of support strips contact and extend transverse to the travel direction of the belt. Each adjacent pair of strips defines a suction slot. At one or both lateral side zones of the belt, a respective filler limits each slot, and the fillers establish the length of the slot across the belt. A respective filler extension extends inward from each of the fillers. The extensions are pervious to the fluids being suctioned, such as water and air, by being narrowed or wedge shaped or by being perforated. The fillers with their extensions are adjustable in position transverse to the direction of travel.

Abstract: Mechanism for automatically controlling and maintaining a selectively differentiated vacuum pressure in a vacuum head accommodating to the transverse width of a moving web passing relative thereto involving means for supplying air to the vacuum head at spaced points along the width and control means for detecting the need for an increase or decrease in the vacuum at the spaced points along the length and selectively charging more or less air to the vacuum head at the corresponding points along the length.

Abstract: A suction box coordinated with a dandy roll and serving the dehydration of paper webs features on its ends respective deckle slides wherein each deckle slide is of a design such that it elastically yields to the peripheral face of the dandy roll. Each deckle slide is wear-resistant and adaptable to varying dandy roll diameters and dipping depths. Thus, each deckle slide comprises a lamella package which extends with its longitudinal axis in the direction of web travel. The lamella package includes a plurality of parallel, rigid lamellae shiftable relative to one another and lying in respective planes extending generally perpendicular to the direction of web travel.

Abstract: A suction dewatering system for a papermaking machine has a suction device with an opening extending longitudinally in a direction transverse to the path of material travel through the machine. Elongated wear strips are supported on opposite sides of the opening to define a suction slot therebetween. A guide channel extends longitudinally through at least one of the wear strips in a direction parallel to the suction slot. An adjusting plate is shiftable longitudinally within the guide channel. Oblique cam slots in the adjusting plate coact with fixed guide members to laterally adjust the position of the one wear strip relative to the other wear strip to thereby vary the width of the suction slot.

Abstract: An adjustable deckle is provided for use in papermaking machinery to be positioned between the ends of adjacent wear surfaces to facilitate prevention of loss of vacuum applied to the wear surfaces in operation of the machinery. The deckle includes an elongated member having a pair of opposing elongated front and rear faces, a pair of elongated top and bottom faces and a pair of end faces. The front face has a configuration conforming with the configuration of an adjacent edge of one wear surface when the deckle is inserted between two wear surfaces. The rear face has a recess therein and a resilient strip is mounted in the recess. A shiftable element is also mounted in the recess by engagement between surfaces of the element and surfaces of the elongated member. The shiftable element has a portion exposed through an opening in the rear face of the elongated member.

Abstract: A constant flow felt dewatering system including first and second suction pipes with a slot in each pipe. A felt is positioned to pass over the slots of the first and second pipes. A centrifugal exhauster is connected by conduits to the first and second suction pipes. Drive structure is provided to operate the centrifugal exhauster and apply suction to the first and second suction pipes and to advance the felt over the pipes whereupon suction is applied thereto to dewater the felt. Controls are responsive to change in felt conditions to vary the dwell time of the felt with respect to the slots in order to maintain a substantially constant flow.

Abstract: A suction dewatering system including a suction device adapted to be connected to a suction source and having a longitudinal opening therein through which suction is applied. A cover is provided for the device including at least two spaced lands to be mounted to the device with the space therebetween forming a slot in alignment with the longitudinal opening in the suction device. A wear strip is removably mounted on each land and has a wear surface thereon for a medium to be passed thereover for dewatering. At least one of the wear strips is adjustable so that the shifting of each adjustable strip in the longitudinal direction causes the strip to shift laterally and vary the slot width in the direction of travel of the medium across the wear surface and varying the dwell time of the medium over the slot to which suction is being applied. A cam arm longitudinally extends in a longitudinal track in the cover.

Abstract: A suction dewatering system which includes a suction device adapted to be connected to a source of suction and having at least one longitudinal opening therein to which suction can be applied. The opening is positioned substantially perpendicular to the direction of medium travel across the suction device for dewatering thereof. An adjustable slot cover is provided for the suction device and includes a base. The base is mounted to the suction device in fixed position and has surfaces thereon forming spaced longitudinal lands and defining a longitudinal slot between each pair of adjacent lands in alignment with the suction device opening. A wear strip is removably positioned on each of the lands for engagement with the medium passing thereover. The wear strip on one of each pair of adjacent lands is stationary in respect to the direction of medium travel and the wear strip on the other of the pair of adjacent lands is automatically adjustable with respect to the direction of medium travel.

Abstract: A dewatering suction apparatus for paper making machine having foil plates which form suction slots under a wet paper conveyor belt has an air outlet nozzle which injects air under the conveyor belt on the up-stream side of the suction slots generally counter to the direction of movement of the belt. The apparatus also has an auxiliary suction device on both side edges of the belt. The auxiliary suction device has a side edge sensing finger to control the size of the suction slot opening at each side edge of the belt.

Abstract: Apparatus for forming one or more sheets from a dilute suspension of fibers in a liquid has a Fourdrinier wire the upper reach of which travels above a foraminous support, and a head box which has an outlet discharging the suspension onto the upstream portion of the upper reach. The liquid passes through the wire and support, and the fibers form a mat which is carried and advanced by the upper reach of the wire. The apparatus has several deckles which are impervious to liquid and are mounted in or on the support or at a level immediately above the upper reach of the wire. Each deckle extends lengthwise of the entire outlet of the head box and its width is only a small fraction of the width of the outlet. Feed screws or the like are used for moving the deckles sideways so that they overlie selected elongated zones of the upstream portion of the upper reach of the wire, and each deckle can be releasably fixed in the selected position.