Abstract: A screen for cleaning a pulp suspension includes a stationary installation in the infeed area between the infeed branch and the free end of the rotor.

Abstract: A screen, for screening material used in the production of paper, board and the like, having a screen basket and a rotor supporting several blades which can be moved along the wall of the screen basket when the rotor rotates. The blades having a convex curvature on the side facing the screen basket. The radial clearance between the surface of the blade facing the screen and the screen being lowest between the front sector, viewed in the direction of rotation, and increasing towards the rear edge of the blade.

Abstract: A separator for separating solids and other objects (debris) from a liquid, and having a separator body (2) through which the liquid, having debris entrained therein (16, 19, 20), flows from an inlet (6) to an outlet (13), and a port (5) for diverting flow from the outlet during moderate flows whereby the debris entrained in the liquid is removed. A floor (11) wherein the separator is raised to form a hump (43) adjacent to or in which the opening (5) is located.

Abstract: A screening apparatus for screening acceptable and rejectable material from a pressurized fiber suspension includes a housing and a rotor within the housing. The rotor has a top end. A screen basket is positioned generally concentrically around the rotor. A rotor blade ring is connected to the top end of the rotor and rotates with the rotor. A stationary defibering ring is positioned adjacent to the rotor blade ring.

Abstract: A screening basket is disclosed which is intended to be located in a screening device for separating a fibrous suspension. The screening basket is tubular with a diameter and an effective screening height. In order to reduce problems with thickening and wear, the diameter is at least 1.8 times greater than the effective screening height.

Abstract: A pressure screen for separating a liquid mixture is disclosed, comprising a screen housing forming a cylindrical screen chamber, and an inlet housing directly connected to the screen housing and forming a cylindrical inlet chamber, the diameter of which is less than the diameter of the screen chamber. An inlet member is positioned on the inlet chamber for supplying a suspension to be separated substantially tangentially into the inlet chamber and an outlet member is positioned on the inlet chamber for discharging coarse contaminants from the inlet chamber, whereby the scrap particles are prevented from entering the screen chamber.

Abstract: A tandem shale shaker having at least a base, at least one upper shaker screen, at least one lower shaker screen, a basket, an apparatus for vibrating the basket, at least one distribution conduit, a flowback pan, a flow director, and a distribution apparatus. The upper and lower shaker screens are releasably mounted on the basket. The at least one lower shaker screen is mounted at a level below the level of the at least one upper shaker screen and underlies the at least one upper shaker screen. The flowback pan is disposed between the at least one upper shaker screen and the at least one lower shaker screen and overlies at least a portion of the at least one lower shaker screen. The flowback pan directs the screened material passing through the at least one upper shaker screen to the at least one distribution conduit.

Abstract: The present invention relates to a bank note sorting apparatus.

Abstract: In a cylindrical screen of the invention, screen bars are disposed in parallel with intervals therebetween, and the screen has a cylindrical shape having a height larger than a diameter. The screen bars adjacent to each other form each longitudinal slit, and the screen bars are stopped by a ring. In the screen bars, the longitudinal slits are divided in the middle by a member having a width larger than a thickness of the ring in a direction transversely crossing the longitudinal direction of the screen bar. Accordingly, in the cylindrical screen of the invention, a mat formed on the screen can be easily peeled off.

Abstract: Apparatus for the screening of fiber suspensions is disclosed including a housing, a reject outlet and an accept outlet, a screen located within the housing, a rotor including pulsation wings mounted therein, a reject chamber in the housing for collecting a reject portion of the fiber suspension, and an accept chamber for collecting the accept portion of the fiber suspension passing through the screen and supplying it to the accept outlet, each of the pulsation wings including an outside face and an inside face, a leading edge, a trailing edge, and upper and lower ends so that a predetermined pressure difference is created between the outside and inside faces of the pulsation wings in the direction of the lower edge thereof.

Abstract: A screen for cleaning a pulp suspension including a cylindrical screen basket and a double-conical accept chamber which widens in the flow direction of the pulp suspension.

Abstract: A pulp screening assembly where each support ring is weldlessly bonded to a perforate screen section by a bonding material that preferably is a brazing material. There is a joint between each ring and a screen section in which brazing material is disposed. The joint includes at least one set of mating faying surfaces that are offset relative to a longitudinal axis of the screening assembly. In a preferred embodiment, there is a tolerance between mated faying surfaces of no greater than 0.008 inches to ensure a good weldless bond is achieved. In another preferred embodiment, the tolerance is no greater than 0.004 inches. A weldless screen basket is produced having end rings, a plurality of slotted screen sections, and an intermediate ring having slots with back grooves within four millimeters of a ring at each end increasing screening open area.

Abstract: Pressure screen to remove impurities from a paper fiber suspension that contains impurities. Pressure screen includes a housing having at least one inflow fitting, at least one accept outflow fitting and at least one reject outflow, and at least first and second cylindrical wires located within housing. The at least first and second wires are arranged to be consecutively flowed through by paper fiber suspension, which is introduced into housing through inflow fitting. A first accept, including a portion of paper fiber suspension that passes through first wire, flows toward second wire, and a second accept, including a portion of paper fiber suspension that passes through second wire, flows out of housing through accept outflow. The at least first and second wires are arranged within housing so that paper fiber suspension is fed radially through the at least first and second wires from an inside to an outside.

Abstract: An apparatus and method for reclaiming uncured concrete are disclosed. The apparatus includes a hopper with water inlet for introducing water to the hopper. The outlet of the hopper is connected to a separator that is suitably connected to the hopper to receive material therefrom. A screen is positioned in the separator to separate material flowing therethrough. The separator has two outlets for removing material from the separator.

Abstract: The invention relates to a process for separating tenaciously elastic materials such as plastics and rubber from materials tearing and/or defiberizing under high mechanical stress, particularly paper, and to a device for performing said process. The process is characterized in that the mixture of materials to be separated is subjected to high radial, axial and tangential acceleration forces, whereby a mass flow of shredded fibrous material and a mass flow of substantially unshredded plastics is withdrawn separately. The device for performing the process consists of a screen basket which is cylindrical or preferably polygonal in shape and has borings in its jacket to let the defiberized material pass through, a rotatable driving shaft being arranged coaxially inside the screen basket, with blades being attached to said driving shaft, preferably in rigid connection.

Abstract: Process and device for fractioning a suspension containing paper fibers, in which the suspension is separated into at least two fractions by a wire with a scraper. The process includes moving the scraper in a substantially parallel relation to the wire so that the wire is kept clear, and a parallel current is created in the suspension with respect to an inlet side of the wire by a rough surface of the scraper, so that the suspension is dragged along the inlet side of the wire with the scraper with minimal slippage of the suspension. The device includes at least one wire having an inlet side with openings; and a scraper having a closed rough surface provided adjacent the at least one wire; wherein the scraper is movable substantially parallel to the inlet side of the at least one wire, whereby clogging of the openings of said wire is substantially prevented.

Abstract: A screen device for separating fiber suspensions comprises a screen (40) defining a central chamber (36), and a rotor (15) in the central chamber having a first (21) and a second (27) rotor portion, respectively, provided with first (43) and second (41) pulsation elements, respectively, for pulsating the suspension close to the screen along a first (11) an a second (9) axial screen portion, respectively, of the screen. The first rotor portion (21) and the first axial screen portion (11) define a first screen chamber (39) and the second rotor portion (27) and the second axial screen portion (9) define a second screen chamber (37). Distribution means (22, 28) are provided for dividing the incoming fiber suspension into two part streams having the same axial directions in relation to the rotor and for distributing the two part streams to the first and second screen chambers (39, 37), respectively.

Abstract: Pressure type screening apparatus for screening papermakers' stock and method of use is disclosed. Screen (20) has an inlet screening surface (23) and an outlet surface (unlabled). Pressure transducers (not shown) vary the fluid pressure on the inlet surface of the screen (23) from a maximum to a minimum, and also vary the fluid pressure on the outlet surface of the screen (20) from a minimum to a maximum at a repetitive cyclic rate. The amplitude of such pressures is such that flow reversal occurs through the screen (20) and any fiber mat that tends to form on the inlet surface (23) is disrupted or fluidized.

Abstract: Cylindrical screen, particularly for paper pulp, of the type comprising at least one filtering element (10) positioned between two flanges (1, 2) by means of a number of bars (3). The filtering element is composed by wires (10) placed side by side and held by rings (11). This filtering element is rigid in the axial direction and is placed upstream from the above mentioned bars (3), in relation to the direction of flow of the pulp. The filtering element is held against the bars (3) through the rings (11) that are in contact with the bars without being attached to them, so as to maintain its shape by withstanding the pressure exerted by the pulp.

Abstract: A system and process for recycling shredder residue, in which separating any polyurethane foam materials are first separated. Then separate a fines fraction of less than about ¼ inch leaving a plastics-rich fraction. Thereafter, the plastics rich fraction is sequentially contacted with a series of solvents beginning with one or more of hexane or an alcohol to remove automotive fluids; acetone to remove ABS; one or more of EDC, THF or a ketone having a boiling point of not greater than about 125° C. to remove PVC; and one or more of xylene or toluene to remove polypropylene and polyethylene. The solvents are recovered and recycled.

Abstract: A screen, for screening material used in the production of paper, board and the like, having a screen basket and a rotor supporting several blades which can be moved along the wall of the screen basket when the rotor rotates. The blades having a convex curvature on the side facing the screen basket. The radial clearance between the surface of the blade facing the screen and the screen being lowest between the front sector, viewed in the direction of rotation, and increasing towards the rear edge of the blade.

Abstract: A pressure screening apparatus for screening a stock suspension and screen clearer for a pressure screening apparatus.

Abstract: A screen for cleaning a pulp suspension includes a stationary installation in the infeed area between the infeed branch and the free end of the rotor.

Abstract: Screening apparatus is disclosed for separating fiber suspensions comprising a housing having an inlet for the fiber suspension, a stationary tubular screen dividing the interior of the housing into a central chamber for receiving the fiber suspension from the inlet and an outer accept chamber for receiving an accept portion of the fiber suspension which has passed through the stationary tubular screen, a rotor journalled on the housing for rotation within the central chamber coaxially with the stationary tubular screen, the rotor including a rotationally symmetrical element, a reject chamber for receiving a reject portion of the fiber suspension at one end of the stationary tubular screen, and an annular passage for dilution liquid including a stationary annular wall portion juxtaposed with the rotationally symmetrical element of the rotor.

Abstract: A screen for cleaning a pulp suspension including an additional screen basket in the infeed area for pre-screening.

Abstract: Process and pressure grader screen for wet screening stock suspensions. The process includes conducting the stock suspension along the screen, so that break-away eddies are formed on an inflow side of the screen, separating portions of the stock suspensions, so that a part of the stock suspension passes through the screen apertures as underflow and an other part is rejected as overflow, and moving the at least one clearer relative to the screen, so that one of pressure- and suction impulses are produced at the screen apertures to form pre- and back flows. In this way, a flow direction of the break-away eddy is reversed by the back flow to rinse a part of the screen lying between the screen aperture with the back flow and an adjacent downstream aperture. The pressure grader screen includes a plurality of bars arranged to form a plurality of essentially parallel grading slots through which an accepted part of the stock suspension passes during the wet screening.

Abstract: A filter media for physically separating particles of an abrasive media having a given mean average particle size from a chemical-mechanical polishing (CMP) slurry. The abrasive media has a particle size distribution including particles larger than the mean average particle size. The filter media is provided as being formed of at least one sheet of a porous membrane having a first and second surface defining a thickness dimension of the membrane therebetween, and having a plurality of generally cylindrical capillary pores formed through the thickness dimension sized effective to capture the particles larger than the mean average particle size. In service, the slurry is supplied to the first side of the filter media, and is passed through the media to the second side thereof such that at least a portion of the particles of the abrasive media larger than the mean average particle size is retained on the first side of the filter media.

Abstract: Apparatus is disclosed for screening fiber suspensions including a housing, an annular screen disposed within the housing, a rotor disposed within the annular screen for rotating relative to the annular screen, pulsation wings disposed between the outer surface of the rotor and the annular screen for relative rotation with the rotor, an inlet for the fiber suspension to feed the fiber suspension to one end of the screening zone, an accept outlet for a portion of the fiber suspension which passes through the annular screen, a reject outlet for a portion of the fiber suspension which does not pass through the annular screen, and a dilution liquid nozzle for supplying a dilution liquid to the screening zone between the rotor and the annular screen, the dilution liquid nozzle disposed proximate to the reject outlet and directing the dilution liquid into the screening zone along the outer surface of the rotor.

Abstract: Screen panels are disclosed for the screening of fibrous material. The screen panels are one-piece screen panels which can then be incorporated into a cylindrical screen jacket without the use of welding. The screen panels include a plurality of apertures for the fibrous material and are made from a wear-resistant material. Methods for producing these screen panels are also disclosed.

Abstract: A screen apparatus of the invention is provided with a tank for receiving a papermaking material; a screen situated inside the tank for dividing the tank into a first chamber and a second chamber to separate a foreign substance from the papermaking material; a first supply passage for supplying the papermaking material into the tank; a second supply passage for supplying the papermaking material into the tank; a stirring member disposed between an inner wall of the tank and the screen to stir the papermaking material introduced in the first chamber; a screened papermaking material discharge passage communicating with the second chamber for discharging a screened papermaking material outside the tank; and a foreign substance discharge passage communicating with the first chamber for discharging a foreign substance outside the tank.

Abstract: Pressure screening apparatus for screening a suspension of paper fiber stock employs a rotor in which a single impulse or foil member is carried or positioned to move along a discrete portion of the screen surface. This arrangement improves efficiency of operation of the pressure screen by reducing the rotational effect of the rotor on the stock suspension being screened and by providing a less disturbed screening region through which the single foil operates. Embodiments are shown in which multiple single impulse elements sweep over discrete portions of a screen and in which a single foil is combined, in screening apparatus, with multiple foils in accordance with the increase in consistency of the stock as it passes through the screen.

Abstract: The invention relates to a method for controlling a multi-step screening apparatus (1), the method comprising controlling other accept, reject and dilution flows in relation to the flow measured in the accept channel (7a) of the first screening step (3a). Thus a simpler control unit (9) can be used and accept of higher quality can be obtained than before. The invention further relates to an apparatus for controlling a multi-step screening apparatus (1), said apparatus comprising a control unit (9) arranged to measure the flows of all accept, reject and dilution water channels (7a-7c, 5a, 5b, 11a, 11b) and to adjust the flow of the other channels on the basis of the flow of the accept channel of the first step.

Abstract: Screening apparatus is disclosed for separating fiber suspensions including a housing having an inlet for the fiber suspension, a stationary tubular screen having an inlet end adjacent to the housing inlet and an outlet end, and dividing the interior of the housing into a central chamber for receiving the fiber suspension from the inlet, and an outer accept chamber for receiving an accept fraction of the fiber suspension, a rotor journalled on the housing for rotation within the central chamber coaxially with the stationary tubular screen, a reject passage for receiving a reject portion of the fiber suspension at the outlet end of the stationary tubular screen, and an annular reject passage which has a radial width and a cross-sectional area at the outlet end of the stationary tubular screen for discharging the reject portion of the fiber suspension from the central chamber to the reject passage, the annular reject passage including an annular flange attached to the inner wall of the passage, resilient tubing

Abstract: Pressure screening apparatus for screening a suspension of papermaking stock employing an enclosing housing and a cylindrical screen, with a drum type rotor, has the screen divided or formed with axially spaced annular screening zones and a corresponding number of annular reject collection areas, one for each screening zone. The collection areas are positioned so as to receive rejects from one of the screening zones only, while a rotor is formed with outlet openings that apply stock suspension to selected ones of the screening zones so that there is no mixing of rejects between screening zones, and each screening zone receives stock suspension for screening independently of the other screening zones.

Abstract: A screen apparatus is formed of a tank for receiving a papermaking material, a cylindrical first screen for partitioning the tank into a first chamber and a second chamber, an annular second screen disposed in the first chamber, and a rotating member disposed in the first chamber. The first screen has a closed end at one side, an open end at the other side, and a plurality of first openings in a circumferential portion thereof. The annular second screen has second openings in a plate portion and a large opening at the center thereof. The annular second screen is disposed adjacent to the first screen at the side of the closed end, and the rotating member faces the large opening of the second screen and the closed end of the first screen. Also, the rotating member includes first agitating members facing the second screen, and second agitating members facing the second screen.

Abstract: A programmed bar screen cleaner removes debris from a screen positioned in a channel to prevent the flow of the debris to a liquid treatment. A rake has tines for engaging the screen to move the debris toward and past an upper end of the screen to remove the debris from the screen. Automatic and controllable raking operations are provided to handle the situation in which there is debris jammed in the screen. The jammed debris resists the movement of the rake along the screen, which is sensed via rake motor overloaded, indicated by motor current in excess of a limit. The existence of a jammed rake causes positive release of the rake from the face of the bars, and further movement of the rake is controlled according to the nature of the problem which caused the jamming.

Abstract: The present invention relates to a screen cylinder for screening fiber suspensions of the wood processing industry. The screen cylinder comprises a rotationally symmetric screen surface located on the side of the pulp to be screened, and support rings supporting the screen surface on the opposite side; the screen surface mainly comprising grooves and screen apertures in connection with the grooves, the grooves being comprised of a side surface on the upstream side, a bottom surface, and a side surface on the downstream side, characterized in that the bottom surface of the groove rises towards the side surface of the upstream side.

Abstract: The invention realizes an improved mechanical strainer for fibrous suspensions including: a rotor; a filtering basket substantially coaxial externally to said rotor; an interspace defined between the side surfaces of said rotor and of said filtering basket; an outer casing suitable to house said filtering basket and said rotor. Inside this outer casing there are: a feeding chamber receiving the fibrous suspension to be treated, a delivery chamber of the "accepted" and a waste chamber of the "waste". The rotor is provided with a plurality of diffusing ducts developing through diverging ways according to the flow direction and being suitable to pipe the fibrous suspensions to be treated from said feeding chamber to said interspace.

Abstract: A vibratory separator having a resiliently mounted housing with a vibratory drive. A screen extends across the housing and a cover is positionable over the screen. The screen includes a discharge port therethrough aligned with a discharge passage for removing material from the top of the screen from the system. Another discharge passage cooperates with a manifold plate extending across the separator beneath the screen. An access port is provided through the cover and arranged to receive a discharge plug which can selectively close the discharge hole through the screen. In operation, separating or dewatering is first accomplished, the energy level of the vibration is reduced and a vacuum is drawn above the screen. Bleed air is allowed into the separator below the screen with a restricted flow so that a vacuum can be drawn. Once the material has dried, the vibrational energy can be increased and the plug removed from the hole through the screen. The process material may then be discharged from the unit.

Abstract: This process for enriching nickel-bearing oxide ore comprises pulping the ore, washing the pulped ore for at least 1 minute, sorting the washed ore in a damp environment so as to separate at least one fine fraction from a granular fraction, subjecting the fine fraction to densimetric separation at a dividing density of between 1.7 and 2.5 and recovering the light fraction separated off as enriched ore.

Abstract: A sieve for sorting fiber suspensions, symmetrical in relation to an axis, with an inflow side for the fiber suspension to be sorted and an opposite outflow side. This sieve is useful for pressure sorting machines having a rotor that may be rotated around the axis of the sieve and that is provided with profiled elements around the inflow side of the sieve in order to generate positive and negative pressure pulses in the fiber suspension that is to be sorted. The inflow side of the sieve has grooves approximately parallel to the axis of the sieve that follow each other in the circumferential direction of the sieve. A through-channel opens into each groove. The grooves are delimited by a front and a rear side wall, seen in the direction of rotation of the profiled elements.

Abstract: A screening device is described which is adapted in particular for fiber suspensions when paper is pulped. Along the outer circumference of a rotor body, there are disposed vanes which are oriented towards a screen wall. The vane is supported by a support member made of several parts, e.g. two parts, namely of a vane carrier and a strut carrier. The strut carrier is secured to the rotor body, for example by welding. The vane carrier and the strut carrier are detachably connected with each other by a screw connection which prevents rotation therebetween. More particularly, the connection between the vane carrier and the strut carrier is of the interlocking type.

Abstract: A programmed bar screen cleaner removes debris from a screen positioned in a channel to prevent the flow of the debris to a liquid treatment. A rake has tines for engaging the screen to move the debris toward and past an upper end of the screen to remove the debris from the screen. Automatic and controllable raking operations are provided to handle the situation in which there is debris jammed in the screen. The jammed debris resists the movement of the rake along the screen, which is sensed via rake motor overloaded, indicated by motor current in excess of a limit. The existence of a jammed rake causes positive release of the rake from the face of the bars, and further movement of the rake is controlled according to the nature of the problem which caused the jamming.

Abstract: A universal bar screen cleaner removes debris from a screen positioned in a channel guiding a flow of liquid, solids and the debris. The screen is to prevent the flow of the debris to a liquid treatment basin downstream of the screen. The screen has an upper end, a front side facing the upstream flow and a back side facing the downstream flow. A rake has tines for engaging the screen to move the debris toward and past the upper end of the screen to remove the debris from the screen. A frame supports the rake in a first rake position where the tines are engagable with the screen from the front side, or in a second rake position where the tines are engagable with the screen from the back side.

Abstract: A de-trashing unit has a rotor fabricated from steel blank. The rotor has two swept blades with blunt leading edges and relieved trailing edges. The rotor is driven to rotate over a trash screen with holes of between one-quarter and one-half inch in diameter. The blade is positioned with a clearance between the blade and the screen of between 0.005 and 0.010 inches. The relieved portions of the blades face the screen while the trailing edges of the blade are tapered between 18 and 30 degrees away from the screen surface. The blade taper creates a strong negative pressure pulse which keeps the screen clear. Holes drilled through the relieved portion of the blade allow circulation through the blade into the region of low pressure generated by the relieved portions passing over the screen. The circulation created by the holes creates microturbulence which keeps a water and paper fiber slurry fluidized.

Abstract: Improved methods of screening particulate matter are disclosed. For example, aqueous mineral slurries containing at least 10 weight percent of finely divided mineral solids are mechanically size separated using vibratory screening and a self propelled recirculative rotating spray bar, prior to, and subsequent to various processing steps. The employment of the spray bar improves the screening process by preventing blinding of the screen, as well as increasing throughput. As a result this invention reduces screen residues and/or increases production rates significantly.

Abstract: A pressure screen comprises an outer housing with a pulp inlet, and accepts and rejects outlets and an advantageous mount of a stationary screen drum (screen cylinder) in the housing. The screen drum is secured at an upper end flange with bolts to an intermediate ring and supported via the intermediate ring by the housing. A rotating rotor is disposed inside the screen drum. The bottom end of the screen drum is provided with at least one groove with at least one primarily flexible material ring disposed in the groove. Cooperating substantially conical surfaces are provided in the bottom of the screen drum and a bottom intermediate ring, in which the groove is formed.

Abstract: An apparatus and method for screening wood pulp and other fibrous fluid suspensions. The apparatus and method relate to rebuildable, modular screen cylinders for screening thick pulp slurry in pulp and paper applications. The screen sections of the modular screen cylinder of the present invention are of a nonwelded construction. A lap joint according to the present invention is provided in each screen section connecting the ends of the individual sections when the screen sections are rolled into cylindrical shape. As a result, the lap joint of the current invention provides for a nonwelded, modular screen cylinder which is less expensive to manufacture and provides for increased wear life and durability as compared to similar screen baskets previously known.

Abstract: Apparatus for screening pulp suspensions containing heavy impurities is disclosed including a casing with an inlet for the pulp suspension at the lower end of the casing, a stationary screen mounted within the casing, a rotor mounted for rotation within the stationary screen thus forming a screening zone between the rotor and the stationary screen, with the inlet disposed within the rotor, the rotor including at least one opening adjacent to its upper end for transferring the pulp into the screening zone and a chamber for the heavy impurities disposed adjacent to either the upper or lower end of the casing, the rotor including strips or grooves for moving heavy impurities from the inner surface of the rotor to the chamber.

Abstract: Apparatus for separating light impurities from a pulp suspension is disclosed. The apparatus includes a housing mounted on a fractionation device and symmetrically disposed with respect to the axis of rotation of the casing of the fractionation device, a passageway extending between the housing and the casing, and in which the top of the housing includes an outlet for the light impurities and a dilution liquid inlet for injecting dilution liquid tangentially into the housing.