Abstract: A cylindrical polymeric cover for an industrial roll includes a plurality of through holes and a plurality of blind drilled holes. The through holes and the blind drilled holes are arranged in a pattern in which: (a) the through holes are arranged in rows that define an oblique angle relative to a plane that is perpendicular to a longitudinal axis of the cover; (b) the through holes of one row are offset from the through holes of the adjacent row, with the offset between rows defining an angle of approximately 20-40 degrees; (c) the blind drilled holes are arranged in rows located between the rows of through holes; (d) the blind drilled holes of one row are offset slightly from the blind drilled holes of the adjacent row, with the offset between rows defining an angle similar to that defined by the through holes; and (e) each of the blind drilled holes is located at the substantial center of a triangle defined by the closest three through holes.

Abstract: An apparatus for the application of atomized fluid to a permeable web material is disclosed. The apparatus has a fluid source and a receipt plenum. The fluid source is disposed in proximate fluid contact with the first surface of the web material. The fluid source has a positively pressured permeable roll having atomized fluid and at least one aperture disposed therein. The apertures provide fluid communication between an inner portion of the roll and a surface thereof. The fluid is disposable from the inner portion to the surface through the apertures into contacting engagement with the permeable web material. The receipt plenum has an opening disposed adjacent to the second surface of the web material that provides a source of negative pressure to the second surface of the web material that causes the fluid to traverse through the web.

Abstract: An apparatus and a method are provided for draining water from a cellulose web which is formed in a wedge-shaped space defined by two wires, the wires being supported on chamber assemblies including at one time at least one water receiving chamber, the water flowing therein through the wire as a result of a pressure difference. Each water receiving chamber has connected thereto at least one substantially vertical pipe having a vertical drop between its top and bottom end sufficient for developing a gravitational suction leg in the water flowing pipe, and the pipe terminating in a water receiver.

Abstract: A roll in a paper or board machine has a roll frame or center shaft (15) with bearings mounted at its ends and a groove-like surface structure (10). There is a contact between the surface structure and the center shaft so that an essentially closed structure is formed. The roll produces a vacuum that keeps the web attached to the outer surface of a fabric in the fabric wrap area of the roll circle by utilizing the boundary layer airflows of the surface structure flow and/or of the web. A dryer group has at least one contact dryer cylinder and at least one turning roll with a single fabric run arrangement.

Abstract: A roll for use in a paper machine includes a roll shell having an inner periphery. A roll cover is positioned around the roll shell and has an outer surface. The roll cover and/or the roll shell include at least one main flow channel positioned radially inward from the outer surface and radially outward from the inner periphery. The roll cover includes at least one secondary flow channel in communication with each of the outer surface and at least one main flow channel.

Abstract: The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened so that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the roll mantle, with at least each of the openings and/or recesses adjacent to it.

Abstract: A device for dewatering a pulp web having a dewatering section comprising top and bottom wires forming a wedge-shaped dewatering zone which can be adjusted and/or pressure-loaded at the downstream end, and with a pair of press rolls mounted at the end of the bottom wire. The top roll of the pair of press rolls is a shoe press roll.

Abstract: A threading device and a method for threading a tail of a web, wherein, for guiding the path of a tail separated from a full-width web in a paper machine or a paper finishing device, the threading device comprises a suction channel, placed at least partly in a paper machine portion and provided with a reduced pressure for gripping the tail, and transfer means for transferring the suction channel in the portion of the paper machine and simultaneously for releasing the tail to the portion.

Abstract: The invention relates to a roll for a paper or board machine comprising axle journals on whose support the roll is arranged to revolve, end flanges with which the axle journals are connected, and a mantle which is connected with the end flanges. The mantle is provided with a number of openings extending through the mantle and/or recesses formed into the outer surface of the mantle, which openings and/or recesses form a regular pattern. Solid connecting portions in the outer surface of the mantle around said openings and/or recesses are opened to that, from each opening and/or recess, there is a connection, provided in the form of a groove or an additional recess extending into the outer surface of the mantle, with at least each of the openings and/or recesses adjacent to it.

Abstract: A method of manufacturing a suction roll shell for use in a paper-making machine utilizes a mandrel with a length and a cross-sectional area corresponding to the shell. The mandrel has a plurality of generally radially extending holes. A plurality of pins are placed in the holes, with each pin extending radially outward from the shell a distance greater than a desired thickness of the shell. At least one elongate fiber is wound around the mandrel to form the shell with the desired thickness. The pins are removed from the mandrel and the shell.

Abstract: A papermakers' screen basket for pressure screening of papermaking stock or for pressure filtering is formed with a support core formed with honeycomb like cells that extend radially in the direction of flow through the screen basket, and a thin covering having screening openings therethrough is supported on the inlet surface of the honeycomb cell core. The core is formed by rolling a flat section of core into the shape of a cylinder and welding the abutting ends to form a complete cylinder and then attaching a perforated or a mesh sheet-like metal covering against the core inlet surface, in which the thin sheet metal covering defines small openings, such as slots or apertures, leading into the honeycomb core, and is welded in place.

Abstract: Suction roll for a paper machine for dewatering a material web guided on transport belt in a web run direction. The suction roll includes a roll jacket over which the transport belt is guided, a first, external suction box that partially encompasses the suction roll and that is adapted to create a vacuum to suction the material web. The first suction box is adapted to suction at least one gusset formed between the roll jacket and the transport belt. The suction roll further includes a second suction box positioned to border the first suction box.

Abstract: An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

Abstract: A suction roll for a paper machine in which a stationary suction shoe is arranged inside a revolving mantle loop and is connected to a source of negative pressure. The mantle loop is a substantially water-receiving and permeable fabric-sock loop that receives water and is, in a preferred embodiment, supported by means of guide members arranged inside the loop. The suction shoe is provided with a permeable guide deck against which the inner face of the fabric-sock loop glides.

Abstract: A vacuum/blowing sheave on the end of the lower calender roll of a papermaking machine threads a tissue web tail from a Yankee dryer to a take-up reel through the calender. The sheave is positioned adjacent to the outlet of the threader tube from the Yankee dryer, where the vacuum portion of the sheave picks up the tail and transports it towards the take-up reel. Upon transiting the closed nip of the calender, the tail is blown by a short blowing section on the sheave into the tube threader which leads to the take-up reel.

Abstract: The suction roll of a dryer group is in the path of the web and of the web support belt from an upstream dryer cylinder to a downstream dryer cylinder. The suction roll has an annular roll shell having a plurality of radial holes and being free of stationary inserts at least over the predominant part of the length of the roll shell. A hollow roll journal at at least one end of the suction roll connects vacuum into the suction roll and to the radial holes. In at least some of the holes there are respective deflector pieces. Each extends a short radial distance into the inside of the roll shell over a short radial portion. The deflector piece has a continuous channel which extends radially inward through the hole toward the inside of the roll in a direction substantially parallel to the direction of extension of the hole and the radially inward portion of the channel is curved in the direction contrary to the direction of rotation of the roll shell.

Abstract: The invention concerns a suction roll (10) for a paper making machine, on which the paper web is pressed towards the outer face of the roll mantle. The suction roll (10) is divided, in the axial direction of the roll, into at least three vacuum spaced (A.sub.1, A.sub.2, A.sub.3). In the interior of the suction roll (10), there are at least two partition walls (17a, 17b), by means of which the suction space (13) is divided into separate zones of negative pressure. The lateral vacuum spaces (A.sub.1, A.sub.3) in the suction space can be subjected to a higher negative pressure than the vacuum space (a.sub.2) in the middle area of the roll, whereby the profile of negative pressure is formed such that the negative pressure increases across the width of the roll towards the lateral areas. The invention also concerns a method for producing a desired pressure profile for a suction roll.

Abstract: The invention relates to a suction roll (10) comprising a turbulence suppression element (16) located in the vicinity of the end of an external suction pipe (15). The turbulence suppression element (16) comprises at least one sheet member and is fitted relative to the end of the suction pipe (15) in such a way that turbulence in the intake air during the suction phase is substantially prevented and that a low air pressure is thus maintained at a desired, approximately constant value on the inner surface of the roll shell along the entire roll width and the quantity of suction air is also maintained at a desired, approximately constant value through the perforated sections (14) of the roll shell.

Abstract: The present invention concerns a device for generating negative pressure inside a cylindrical roll mantle of a revolving roll. The roll has a roll mantle provided with through-holes, grooves or equivalent apertures and confining a suction chamber in the interior thereof, in which a negative pressure can be generated by suctioning air out of the suction chamber. A suction flow directed towards the suction chamber thereby prevails in the holes, grooves or equivalent apertures of the roll mantle. At least one rotor blower or equivalent is attached to the roll to revolve along with the roll, with an intake side of the rotor being connected to the suction chamber of the roll. The movement of rotation of the roll thereby produces rotary movement of the rotor or equivalent, which in turn generates negative pressure in the suction chamber. Thus, in the arrangement in accordance with the present invention, external equipment of negative pressure or a separate piping system is not needed.

Abstract: The improved rotary vacuum filter discharge flow assembly provides a discharge filtrate stream having a substantially increased filtrate flow velocity, a reduced vacuum loss, a reduced level of turbulence and air entrainment to means defining an axially-extending valve-receiving space in communication with a remote filtrate collection area. The subject assembly, which is located at one end of a rotary vacuum filter, includes a plurality of radially-disposed, inlet conduit means connected to and in communication with the rotary vacuum filter discharge flow assembly and comprises a plurality of radially-disposed discharge conduit means for transporting the discharge filtrate stream from the inlet conduit means to the valve-receiving space means. Each of the discharge conduit means are connected at one end to one end of the inlet conduit means, and are joined at the other end to respective adjacent discharge conduit means for defining the valve-receiving space means.

Abstract: Roller for machines in the paper-making industry or similar, with a honeycomb-shaped roller element formed by upright straight and corrugated bands, extending approximately in the circumferential direction and alternating with each other in the axial direction, said bands being connected by welded joints. To make passages, which allow a throughflow in the circumferential direction, between the roller element and a fabric cover supported by the latter, openings adjoining the fabric cover are provided in the roller element between the fabric cover and the radially outer edges of the corrugated bands in the area of the connecting points and in the center between the connecting points, and in order to increase the open-passage area of the fabric cover, the latter rests directly on the roller element.

Abstract: Apparatus for de-watering fibrous suspensions, which apparatus comprises a suction housing and a cover. The cover comprises two or more plank members releasably secured to the suction housing and each having secured thereto a number of foil strips. Each foil strip is secured to the plank member by way of a plurality of spaced apart pins which are carried by and project from the plank member. A channel is defined between the foil strips and the plank member which serves for the removal of water extracted from the suspension. A weir may be disposed in this channel to control the flow of water over the foils and air may be introduced into the channel by way of drillings to assist in control of the water and prevent plugging.

Abstract: A dewatering roll or cylinder of a wire press possesses radial support walls upon which there is supported a roll shell or jacket. The roll shell possesses gaps or spaces piercingly extending through the roll shell. The support walls are provided with outflow openings for the expressed liquid.

Abstract: A substantially entirely plastic rotary drum filter is made by applying a layer of plastic to the interior surface of a cylindrical mold, removing the mold, and applying at least one additional layer of plastic to the exposed exterior surface of the shell formed by the first layer. A plastic annular axial valve housing with plural valve chambers and a central valve receiving space is mounted to a head assembly at the head end of the shell. A tail assembly closes the opposite end of the shell to form the drum. Circumferentially spaced interior plastic bucket sections are positioned midway between the head and tail assemblies. Upon the periodic application of a vacuum to the valve chambers, filtrate is delivered from the exterior of the drum through an associated bucket and plastic drainage conduit to an associated valve chamber. Plastic reinforcing rings strengthen the drum along its length and in the region of the bucket section.

Abstract: A substantially entirely plastic rotary drum filter is made by applying a layer of plastic to the interior surface of a cylindrical mold, removing the mold, and applying at least one additional layer of plastic to the exposed exterior surface of the shell formed by the first layer. A plastic annular axial valve housing with plural valve chambers and a central valve receiving space is mounted to a head assembly at the head end of the shell. A tail assembly closes the opposite end of the shell to form the drum. Circumferentially spaced interior plastic bucket sections are positioned midway between the head and tail assemblies. Upon the periodic application of a vacuum to the valve chambers, filtrate is delivered from the exterior of the drum through an associated bucket and plastic drainage conduit to an associated valve chamber. Plastic reinforcing rings strengthen the drum along its length and in the region of the bucket section.

Abstract: A press roll for a press couple for dewatering a web in a papermaking machine wherein the roll preferably is a roll shell with certain of the drilled holes extending radially fully through the shell and certain other holes blind drilled to extend only a partial way into the shell and in one form, the shell having a rubber cover and the blind drilled holes extending alternate different depths to avoid shear planes in the rubber cover.

Abstract: In a paper-manufacturing machine a web is subjected to suction by placing a space between the web and a suction roll lapped thereby in communication with a region of substantially less than atmospheric pressure which is maintained at a part of the suction roll which is not lapped by the web. The structure includes a jacket which defines with the part of the suction roll which is not lapped by the web a hollow region with which a source of suction communicates. This hollow region of less than atmospheric pressure is situated at the exterior of the suction roll and bounded in part by an exterior surface of the suction roll, so that the hollow interior of the shell of the suction roll need not necessarily be utilized for providing the suction at the web.

Abstract: A suction roll, for a paper-making machine having a hollow cylindrical roll shell with a cylindrical inner surface from which a suction box draws water, has members inserted into the roll shell openings. The insert members are apertured with radially-extending ducts for the suction of water to the roll shell inner surface. The insert members form a major portion of the shell inner surface and characterize that surface for relatively low-wear sealing with a suction box movable relative to the roll shell.

Abstract: A roller to de-water fiber suspensions comprises a perforated drum having open ended radial cells formed in the wall thereof. The cells are defined by blades or bridges which form an angle with the radius of the drum at least at the forward end of the bridges by being slanted forward from the radius in the direction of rotation.

Abstract: A self-cleaning suction roll assembly of the type comprising a generally cylindrical shell having an outer radial surface, an inner radial surface and perforations formed in the shell extending from the outer radial surface to the inner radial surface. The assembly includes a plurality of sealing elements for forming a pressure chamber or compartment with the inner surface of the shell, against which such sealing elements are in engagement in the operation of the assembly. The cylindrical shell is provided with recess or recesses formed on the inner surface across the length thereof whereby fibers and other deleterious material which manage to pass through the perforations may be continuously swept into such recess or recesses and carried out of the pressure chamber or compartment and washed out in normal operation of the assembly so that such fibers and other material will not accumulate against the sealing elements inside the pressure chamber or compartment.

Abstract: The web forming, guiding and/or transferring cylinder in the wire section of a papermaking machine has a deformable foraminous shell which is made of filamentary material and the end portions of which are clamped to rigid rotary ring-shaped end walls. The cylinder surrounds a rigid stationary back support which engages the internal surface of the shell opposite that portion of the external surface of the shell which contacts the web. The back support has grooves and/or ports which convey expelled liquid from the web into a suction chamber for admission into the saveall of the papermaking machine. One of the end walls is movable axially to change the axial tensional stress upon the shell. The back support has a convex external surface whose center of curvature may but need not be located on the axis of the cylinder.

Abstract: An open meshwork, hollow cylindrical roll which may be up to thirty feet in axial length and up to sixteen feet in outside diameter has alternate axially-extending, straight and undulated strips of thin material supported in radial grooves in a pair of opposite end rings. The straight strips are imperforate, planar and of substantial width, and the undulated strips are narrow and comprise an inner strip extending between the lower portions and an outer strip extending between the outer portions of each pair of adjacent straight strips. The undulations are V-shaped with at least half of each apex cut away for welding.

Abstract: Galvanic electrodeposition of copper onto a cast iron vacuum box from a rubber covered brass couch shell carrying a non-conductive papermakers forming wire may be prevented by electrically connecting the brass couch shell with a sacrificial anode of more noble metal than brass by means of a conductive metal shoe pivotally secured to but electrically insulated from said vacuum box so as to run in conductive contact with the inside surface of said shell.

Abstract: A paper-machine press section having structure for transferring a web away from the press section toward the drying section of the machine. The press section includes a press roll with which a transfer structure cooperates for transferring a web from this press roll away from the latter and toward the drying section. This transfer structure includes at least a transfer suction roll having an outer shell formed with perforations through which suction is transmitted to a web. A suction chamber communicates with these perforations while between the suction chamber and the outer shell which has the perforations there is a sealing structure which is capable of providing between the perforated shell and the suction chamber a seal which does not require the use of seal water.