Abstract: A method for dilution for a pressure screen comprising a rotor rotating inside a screen a distance to the screen, includes supplying feeding stock into a screening zone formed in the spacing between the rotor and the screen with some of the feeding stock passing through the screen into an accept area to become accept, and the remaining feeding stock discharged into a reject area as reject flow. The amount of the dilution water added into the reject flow is 0.8 to 3.5 times the amount of the reject flow by volume. Additionally, a pressure screen comprises a dilution water adding apparatus adapted to add dilution water directly into the reject area of the pressure screen, wherein the amount of the dilution water added into the reject flow is 0.8 to 3.5 times of the amount of the reject flow by volume.

Abstract: A defibration treatment apparatus including a feeding hole through which a material is fed, a rotator that rotates about a rotational central axis, a fixed member that covers at least a portion of the rotator, and a discharge opening that discharges a defibrated object obtained by defibrating the material between the rotator and the fixed member. In the defibration treatment apparatus, the rotator includes a plurality of rotary blades that extend in directions away from the rotational central axis, at least a portion of the fixed member is configured of a screen including a plurality of openings, the screen is disposed at a position corresponding to an outer rotational circumference of the rotator, and a discharge path in communication with the discharge opening is provided along the screen and on a side opposite the rotator with respect to the screen.

Abstract: The present invention is directed to methods and apparatus for screening a pulp suspension where the pulp suspension is directed to a screening space, where a part of the fibres in the pulp is screened using a drum-type rotor. The residual pulp suspension is then directed to a dilution space where it is mixed with recirculated pulp flow and the pulp suspension in the dilution space will be screened. Resulting preliminary reject flow is directed to a mixing space where it mixes with a dilution flow. The recirculated pulp flow is then directed back to the dilution space.

Abstract: The present invention relates to a turbulence element for use with a rotor and a rotor featuring turbulence elements. The rotor is used in a screening apparatus of the pulp and paper industry. The turbulence element has a longitudinal centerline (CL); two longitudinal edges, a leading edge and a trailing edge; two opposite ends, a first end and a second end; and two surfaces, a top surface and a bottom surface arranged between the leading edge and the trailing edge. The top surface is divided into a leading surface having its origin at the leading edge, and a trailing surface having its origin at the trailing edge. The leading edge and the leading surface are provided with undulations (U).

Abstract: Disclosed herein are an apparatus and a method for mixing and/or mulling a sample, the apparatus comprising at least one container made of a flexible material and containing a sample, means for holding the container, and means for impacting the container, wherein the means for holding and the means for impacting are movable relative to each other, and wherein the means for holding, the means for impacting, and the container are arranged such that the means for impacting and the container can repeatedly collide, whereby an energy of collision can be imparted to the sample, thereby mixing and/or mulling the sample. Also disclosed is an assembly for performing high throughput experiments including the apparatus for mixing and/or mulling a sample and an extruder configured to receive a sample weighing less than 100 grams.

Abstract: A device including a hollow body defining axially extending compartments therein for receiving a slurry of pulp fibers in a carrying flow. The device includes a stationary screen within the hollow body defining a slurry compartment on one side of the screen, and a screened compartment on the other side of the screen. The hollow body also includes a slurry inlet into the slurry compartment, an elutriation suction outlet in communication with the slurry inlet, and elutriation nozzles into the slurry compartment. The device also includes an elutriation pump outside of the hollow body, the elutriation suction outlet being in fluid communication the elutriation pump, and the elutriation pump being in fluid communication with the elutriation nozzles.

Abstract: This descriptive report refers to an invention patent for the improvement in a metallic filtration body, belonging to the area of filtration equipment components for liquids, particularly the equipment named turbo filter (100), formed by: a filter body provided with intermediate filtration chamber (101), with extreme product inlet (102), lower filtrate outlet (103) and an opposite outlet for solids (104); by the metallic filtration body (1); by a rotor (105), provided with a set of fine step paddles (106), laid out at the turbo filter body inlet; and a set of coarse step paddles (107), laid inside and along the filtration body (1); by washing and counterwashing devices in the filtration body; by a motor device (108) for driving the rotor and others; said metallic filtration body (1) comprising basically two or more sections of the coaxial tubular metallic filtration body (1)?; by a connection device (20) among the sections of the tubular metallic (1)? filtration body; and by a regulation device (60) for the p

Abstract: An apparatus (10) for a lorry-based concrete mixer (12) is described. The apparatus (10) comprises a vessel (14) adapted to be positioned beneath a concrete mixer discharge chute portion (16), the vessel (14) comprising a vessel body (18), the vessel body (18) defining a vessel inlet (20) and a vessel outlet (22), the vessel inlet (20) being adapted to receive debris and fluid exiting the chute discharge portion (16), and the vessel outlet (22) being adapted to permit debris and fluid stored in the vessel body (18) to be discharged from the vessel body (18). There is a direct line of sight (24) for a user (26) through the vessel inlet (20) to the vessel outlet (22).

Abstract: A pressure screen for cleaning a fibrous stock including a screen element which has a rotationally symmetrical configuration about a screen axis. The screen element divides the pressure screen into an inlet chamber and an accepted stock chamber. The inlet chamber is connected at a first axial end with a suspension inlet and at a second axial end with a reject outlet. The accepted stock chamber is connected with an accepted stock outlet. The pressure screen also includes a rotor situated in the inlet chamber and including a plurality of rotor blades. The rotor rotates about the rotational axis relative to the screen element. The plurality of rotor blades is arranged on a plurality of circumferential planes of the rotor. The width of an annular gap between the rotor and the screen element decreases from the suspension inlet to the reject outlet.

Abstract: A screening device for fibrous stock suspensions of the paper industry includes at least two separate screening baskets which are connected axially behind one another in the interior of a reinforcing device in the form of a back-up cylinder. A variable-diameter intermediate ring is arranged between the screening baskets. The reinforcing device has a cover part and a bottom part. By way of axial tensile force loading of the arrangement, the intermediate ring is loaded so as to bear radially in the circumferential direction in a gap-free manner against the associated axial ends or screening basket flanges of the screening baskets. The screening baskets are then clamped and fixed in a centrally positioned manner by the intermediate ring in cooperation with the end-side flange of the reinforcing device, the cover part, the bottom part and the intermediate ring.

Abstract: The invention refers to a sieve drum for an installation to remove material to be sieved from a liquid, especially sewage (1), in which case the sieve drum (4) has an opening (6) at least in a front side area (5), through which it can be refilled with a liquid that carries the material to be sieved. According to the invention, it is suggested that the sieve drum (4) should comprise a folded sieve wall (9) with many openings (6), in which case the sieve drum (4) has a support structure that fixes the sieve wall (9) exclusively in a clamping way. In addition, an installation to remove material to be sieved from a liquid, especially sewage (1), with a corresponding sieve drum is described.

Abstract: In a screening device, a rotor element on a rotor coaxial with a cylindrical screen drum and a cylindrical screen including: an upper surface and a front face between the surface of the rotor and the upper surface, wherein the front face faces upstream into pulp flow through a gap between the screen drum and the cylindrical screen; a trailing surface extending downstream of the pulp flow from the upper surface, wherein the trailing surface tapers to the surface of the rotor and meets the surface of the rotor at a back region of the trailing surface, and opposite sidewalls extending between the trailing surface and the surface of the rotor, wherein the opposite sidewalls gradually converge towards the back region.

Abstract: The present invention relates to a method of manufacturing a rotor for a screening apparatus and a rotor structure for a screening apparatus. The rotor structure is particularly suitable in screening fiber suspensions of the pulp and paper industry. The apparatus relates to a novel rotor construction, and especially to a novel means of fastening a turbulence element on the rotor surface. The rotor is provided with easily replaceable turbulence elements so that at least a part of the rotor has at least one area —having a surface configuration different from the remaining rotor surface, on which area the turbulence element is fastened.

Abstract: The invention relates to a strainer for treating a fibrous material suspension suitable for producing a paper, cardboard, tissue, or other fibrous material web, having a plurality of strainer perforations, the smallest cross-sectional areas of which are approximately of the same size. The sorting effect and the throughput are to be improved such that the cross-sectional areas of the strainer perforations on the inflow side have varying size.

Abstract: A molded polyurethane vibratory screen including a body having opposite side edge portions, upper and lower edge portions, an upper surface and a lower surface, first members extending between the side edge portions and the second members extending between the lower edge portion and the upper edge portion, third members substantially parallel and extending transversely between the side edge portions and having multiple first members therebetween, the fourth members substantially parallel and extending transversely between the lower edge portion and the upper edge portion and having multiple second members therebetween, reinforcement members molded integrally with the third and fourth members.

Abstract: A three-stage separator system for separating the solids and liquids from a slurry includes a first stage having an inclined housing defining a liquid channel. A slot sieve is disposed over an open surface of the channel. A mechanical vibrator assembly imparts mechanical vibration to a vibration zone of the slot sieve. A slurry delivery apparatus delivers the slurry to the slot sieve. A second stage includes an inclined conveyer positioned to convey partially-separated solids and includes a drive mechanism driven at a speed to cause the partially-separated solids to tumble as they are transported up the conveyor. A third stage includes a press positioned to accept partially-separated solids passing out of the tunnel press restrictor.

Abstract: A separator system for separating the solids debris from a slurry flowing over a spillway from a storage pit includes a horizontal conveyor horizontally disposed across a flowpath of the slurry below the spillway and including a channel defined by a pair of opposed side members extending upward from a bottom plate having a pattern of perforations formed therein. A plurality of spaced apart paddles oriented in a direction parallel to the channel are fixed to continuous conveyor drive running along the bottom of the trough. A conveyor has a pickup end disposed below the downstream end of the trough and is positioned to catch solid debris that has been carried along by the paddles and convey the solid debris out of the slurry stream.

Abstract: A screen structure which is unusually effective at removing stickies from recyclable fiber but is tolerant of substantial swings in throughput which result in variations in the flow velocity through the screen-slot velocity. One example of the screen structure is created by forming a very large number of similarly shaped vanes then locking them into a ring structure to form a cylindrical screen basket but equivalent surface configurations can also be formed into sheet stock.

Abstract: The present invention relates to methods and devices for separating particles according to size. More specifically, the present invention relates to a microfluidic method and device for the separation of particles according to size using an array comprising a network of gaps, wherein the field flux from each gap divides unequally into subsequent gaps. In one embodiment, the array comprises an ordered array of obstacles in a microfluidic channel, in which the obstacle array is asymmetric with respect to the direction of an applied field.

Abstract: A screen basket with replaceable profiled bars and method of making such screen basket are described herein. The screen basket includes profiled bars evenly spaced circumferentially to form a plurality of continuous slots that covers the whole basket length. The profiled bars are fixed in place by a backing structure, including support rings. In pulp and paper industry, this type of basket is mainly used for pulp screening and is commonly referred to as wedge wire basket. As opposed to conventional wedge wire baskets, in which the profiled bars are permanently joined to the rings, the present invention allows replacing the profiled bars when required and to fully re-use the main structural elements. This is achieved with an assembly that allows to insert the profiled bars, preferably consecutively sled into each aligned ring grooves in a vertical movement. The ring grooves are profiled such that there is sufficient clearance for sliding in the profiled bars.

Abstract: A particle classifier apparatus used to mine for gold and other precious particles. The present invention is meant to replace the sluice box or any inefficient means for gold mining. The present invention is used with and without a stream of flowing water. The present invention comprises a PVC channel, a main trough and a plurality of small troughs. The PVC channel comprises a slit with a narrow end and a wide end. The present invention is designed for the stream of flowing water to flow from the narrow end to the wide end. The water flow pushes the particles through the slit and into the plurality of troughs located beneath the slit. The smallest particles fall into the narrow end whereas the big particles fall into the wide end. The plurality of small troughs are removed from the main trough so the captured particles may be panned for gold.

Abstract: A screen cylinder for screening papermaker's stock, the screen cylinder having slots over substantially all of the screen, and blind grooves in at least one of the screen cylinder surfaces, the grooves extending along that surface at an angle to the slots.

Abstract: An apparatus for screening a fibrous suspension including: a housing, conduits therein at least for fiber suspension being fed, reject and accept, and a rotor and a cylindrical screen drum installed in the housing, at least one of which is rotatable, whereby a surface of the rotor is provided with rotor elements in proximity to the surface of the screen drum, whereby each rotor element includes a front surface facing a flow of the fiber suspension, an upper surface and a trailing surface sloping from the upper surface towards the surface of the rotor, wherein the trailing surface of the rotor element is curved and sidewalls of the trailing surface converge at a back point of the rotor element.

Abstract: A screen basket with replaceable profiled bars is described herein. The screen basket includes profiled bars evenly spaced circumferentially to form a plurality of continuous slots that covers the whole basket length. The profiled bars are fixed in place by a backing structure, including support rings. The support rings are made of at least two sections.

Abstract: The invention relates to a strainer apparatus, such as a strainer basket, a strainer cylinder and the like, wherein slits or gaps are formed between strainer bars (6). The base of the strainer bars is received in receiving recesses (8) adapted to the dimensions of the base of the bars, in a support element (3). The support element can also be a reinforcing or strengthening element, and the strainer bars (6) are permanently fixed to the respective support element (3). At least one pocket (10, 11) that can be filled with a filler material is provided between each support element (3) and each associated strainer bar (6), at least on the edge region (7) of the respective receiving recess (8).

Abstract: A sifter comprising: a receiver having a supply chamber; a sieve assembly having a sieving chamber coupled to the supply chamber; a rotor having a rotating shaft laterally arranged to pass through the supply chamber and the sieving chamber; a drum having a circular cross-section and having a larger diameter than the diameter of the rotating shaft, the drum being extended in at least space of the sieving chamber and arranged coaxially with the sieve; a cylindrical sieve located inside the sieving chamber and arranged coaxially with the rotating shaft; a stirring rotor located in an inner area of the sieving chamber inside the sieve comprising a rotating blade attached to the rotating shaft; an extraction member; and an outlet for discharging powder passing through the sieve from the inner area to the outer area.

Abstract: The present invention relates to a rotor element for use with a rotor and a rotor featuring said elements. The rotor is used in a screening apparatus of the pulp and paper industry. The rotor element (10) has two longitudinal edges, a first, so-called leading edge (12) and a second, so-called trailing edge (14); two opposite ends, a first end and a second end; and a surface (18) arranged between said first edge (12) and said second edge (14), said surface (18) being divided by means of a borderline (20) into a first, so called leading surface (22) having its origin at said first edge (12), and a second, so called trailing surface (24) having its origin at said second edge (14), where a distance (W1) between said borderline (20) and said first edge (12) is smaller at said first end of said rotor element (10) than at the second end of said rotor element (10).

Abstract: A dewatering conveyor system for dewatering chunks of petroleum coke or the like material which is mixed with large volumes of water, wherein the conveyor employs lateral drag bars, the top flight of which conveyor slides forwardly on a screening deck having dewatering screens, and the bottom flight of which conveyor slides rearwardly on a sluice deck underlying the screening deck, wherein a major portion of the conveyor rearward of its discharge end is contained by tail end wall means and side and bottom wall means which can contain large volumes of coke and water, wherein, for handling large volumes of water the discharge end of the conveyor is elevated, e.g., up to 20 ft. or more above the tail end of the conveyor such that water dropping thru the screens will run down toward the tail end of the conveyor and leave the discharge end above the water line, and wherein a drain port is located thru the bottom wall means at a tail end portion thereof.

Abstract: The invention relates to a strainer for treating a fibrous material suspension suitable for producing a paper, cardboard, tissue, or other fibrous material web, having a plurality of strainer perforations, the smallest cross-sectional areas of which are approximately of the same size. The sorting effect and the throughput are to be improved such that the cross-sectional areas of the strainer perforations on the inflow side have varying size.

Abstract: The present invention relates to methods and devices for separating particles according to size. More specifically, the present invention relates to a microfluidic method and device for the separation of particles according to size using an array comprising a network of gaps, wherein the field flux from each gap divides unequally into subsequent gaps. In one embodiment, the array comprises an ordered array of obstacles in a microfluidic channel, in which the obstacle array is asymmetric with respect to the direction of an applied field.

Abstract: A device including a hollow cylindrical body, first and second stationary coaxial annular screening screens disposed within the body, and a rotor within the body and positioned between the screens to conduct the slurry through the first screen and then through the second screen, the rotor being driven in rotation. The pulp slurry passes through a central entry pipe, radially outward and then upward along the inside of the rotor, further inward through a coarse screen cylinder, and then around the end of the rotor to pass between the outer surface of the rotor and the inner surface of a fine screen cylinder. The pulp slurry then finally passes outward through the fine screen cylinder. Coarse rejects, such as knots or other coarse material, are collected at the end of the coarse screening chamber and led away for further processing. Fine rejects are similarly collected at the end of the fine screening chamber, also to be led away separately for further processing.

Abstract: A sifter comprising: a receiver having a supply chamber; a sieve assembly having a sieving chamber coupled to the supply chamber; a rotator having a rotating shaft laterally arranged to pass through the supply chamber and the sieving chamber; a drum having a circular cross-section and having a larger diameter than the diameter of the rotating shaft, the drum being extended in at least space of the sieving chamber and arranged coaxially with the sieve; a cylindrical sieve located inside the sieving chamber and arranged coaxially with the rotating shaft; a stirring rotor located in an inner area of the sieving chamber inside the sieve comprising a rotating blade attached to the rotating shaft; an extraction member; and an outlet for discharging powder passing through the sieve from the inner area to the outer area.

Abstract: An apparatus and method serves, e.g., to deaerate, clean or screen a fibrous suspension and is provided with a closed housing and a rotor arranged centrally therein. The rotor puts at least a part of the fibrous suspension guided into the housing into a rotational flow. The fibrous suspension flowing into the housing through the inlet is put into rotation by a guide element acting hydraulically. This increase the efficiency of the apparatus and prevents disturbing turbulences in the apparatus.

Abstract: A device for cleaning a suspension, preferably a fibrous suspension for paper production. The device includes a screen basket, on the exterior surface of which the suspension to be cleaned is supplied and from the interior surface of which the screened accepted stock is released. A housing surrounds the screen basket. The housing includes an inflow for the suspension to be cleaned, an accepted-stock outlet for the cleaned suspension and a reject outlet for impurities. A scraping device rotates on the outside of the screen basket about the screen basket axis and has scraper blades (foils) which scrape along the exterior surface of the screen basket. The scraping device comprises a drum with a cylinder surrounding the screen basket. The cylinder carries a plurality of foils on its inside facing the screen basket.

Abstract: An apparatus for screening a fibrous suspension including: a housing, conduits therein at least for fiber suspension being fed, reject and accept, and a rotor and a cylindrical screen drum installed in the housing, at least one of which is rotatable, whereby a surface of the rotor is provided with rotor elements in proximity to the surface of the screen drum, whereby each rotor element includes a front surface facing a flow of the fiber suspension, an upper surface and a trailing surface sloping from the upper surface towards the surface of the rotor, wherein the trailing surface of the rotor element is curved and sidewalls of the trailing surface converge at a back point of the rotor element.

Abstract: A screen, for cleaning a fiber suspension, includes at least one separating unit containing a housing, a parabolic rotor, a screen basket, an accept chamber, and a reject outlet. The reject outlet is located in the vicinity of the maximum rotor diameter. The screen also includes one or several devices for interrupting the axial flow located in the vicinity of the maximum rotor diameter.

Abstract: A screen device includes a screen dividing a tank into a first chamber and a second chamber for sorting a foreign material in a papermaking material, a first papermaking material supply passage for supplying the papermaking material to the first chamber from the upper side, and a second papermaking material supply passage for supplying the papermaking material to the first chamber from the lower side. The papermaking material passing through the screen is ejected from a middle area of the screen. The screen device also includes an agitating member located inside the first chamber for agitating the papermaking material, and a foreign material outlet passage communicating with the first chamber through a foreign material outlet provided on a side face of the screen. Therefore, the screen device can improve the sorting effect between the foreign material and a good-quality fiber in the papermaking material.

Abstract: A device for cleaning a suspension, preferably a fibrous suspension for paper production. The device includes a screen basket, on the exterior surface of which the suspension to be cleaned is supplied and from the interior surface of which the screened accepted stock is released. A housing surrounds the screen basket. The housing includes an inflow for the suspension to be cleaned, an accepted-stock outlet for the cleaned suspension and a reject outlet for impurities. A scraping device rotates on the outside of the screen basket about the screen basket axis and has scraper blades (foils) which scrape along the exterior surface of the screen basket. The scraping device comprises a drum with a cylinder surrounding the screen basket. The cylinder carries a plurality of foils on its inside facing the screen basket.

Abstract: A strainer for fibrous suspensions, having a container, a filtering basket inside the container and a rotor inside the filtering basket coupled to motorization means suited to set it rotating. In the container there are a drain chamber of the rejected suspension, a delivery chamber of the filtered suspension, and a collector body arranged in the upper part of the container. The collector body has a lower collector and an upper collector, both with radial longitudinal profile in the shape of a truncated cone and connected to each other in correspondence with the long bases. The lower collector has its short base facing the filtering basket and the upper collector has its short base facing upwards.

Abstract: It is an object of the present invention to provide a screen apparatus having a function of dilute water which is suitable for a centripetal type screen which rotates inside the screen. A screen apparatus A comprises a tank 1 for receiving paper raw materials including an entrance 1c for the paper raw materials, a selection exit 1d and a foreign matter exit 1e, a cylindrical screen 2 fixed in the tank 1 and dividing the tank 1 into a primary chamber 1a and a secondary chamber 1b, and a stirring member 3 which is rotatably supported inside the screen 2 for stirring the paper raw materials.

Abstract: A rotor adapted for use in a hydrodynamic device comprising a cylindrical screen having a circumferentially continuous apertured zone. The rotor has an axis of rotation and includes a substantially cylindrical outer surface adjacent the cylindrical screen surface. The rotor further includes a plurality of sets of a plurality of adjacent vane members supported above a substantially cylindrical outer surface of a rotor by a plurality of brackets. The rotor has an axis of rotation and is mounted within and co-axial with the cylindrical screen to define an annular screening chamber between the rotor and the screen. The sets are equally spaced apart in a direction circumferential to the rotor axis, and the vane members extend the length of the screening chamber parallel to the rotor axis.

Abstract: A screen apparatus includes a tank, a first cylidrical screen disposed inside the tank to form a first chamber, and a second cylidrical screen disposed outside the first cylindrical screen. The second cylindrical screen defines a second? chamber facing the first cylindrical screen and having upper and lower portions communicating with an inlet portion, and second? chamber. A connection member has a groove facing the second? chamber at an intermediate portion of the second cylindrical screen, and a passage communicating with the groove for discharging a paper stock. The paper stock flows to the second? chamber through the upper and lower portions. A part of the paper stock passing through the first and second cylindrical screens is discharged through first and second selection outlet portions, and a part of the paper stock not passing throught the first and second cylindrical screens is discharged through the passage.

Abstract: A the operation of pulp screening apparatus may be improved by employing a multi element foil having a leading foil section and a trailing foil section spaced from and trailing leading section so that adjacent surfaces of the sections one formed by a portion of a pressure side of the leading section and the other by the leading end of the trailing foil section define opposed walls of a passage for fluid directing fluid flow from the pressure side of the leading foil section to a cambered low pressure side of the trailing section. The angle of attack (?) of the complete multi element foil is set to be significantly less than the angle of attack (?) of the trailing foil section to increase the negative pressure pulse generated by the trailing section and thereby improve operation of the screening device.

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 manure management system that removes a large percentage of solids from a manure slurry when the slurry is run across a series of sloped screen separators. The sloped screen on the separator has very small openings. In addition, the separator has a water line with spray heads formed across the sloped screen. The spray heads direct water under pressure onto the sloped screen. Further, the separator controls the air flow through the sloped screen.

Abstract: It is an object of the present invention to provide a screen apparatus for increasing a selecting processing amount of paper stock. The screen apparatus A includes a tank 10, a first cylindrical screen 1, a second cylindrical screen 2 fixedly provided in the tank 10 outside of the first cylindrical screen 1, a stirring member 3 for stirring the paper stock, a connection member 4 having an opening which is in communication with a second′ chamber 1B′ formed between an inner side of the second cylindrical screen 2 and an outer side of the first cylindrical screen 1, and a paper stock discharging passage 5 which is in communication with a passage of the connection member 4 and which has a passage through which the paper stock in the passage is discharged out from the tank 10. The connection member 4 is mounted to the second cylindrical screen 2 and is in communication with the opening. The connection member 4 has a passage for discharging the paper stock in the second′ chamber 1B′.

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: Process for the filtration of paper pulp with a device that comprises a rotor and a stator; one of the two, filter (1), has perforations of slot or hole types, and the other, the backwashing element, includes means that are intended to generate pressure pulses that consist in combatting the gradual clogging of the perforations of the filter and the gradual flocculation of the pulp during the creep of the pulp between the rotor and the stator by creating deflocculation zones and/or increasing the relative speed between the pulp and the backwashing elements.

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

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.