Abstract: A rake assembly for use with an agitating screen of a mechanical screening bucket is provided. The rake assembly may include a rake bar and a plurality of tines coupled to the rake bar. Each tine may include a first end comprising an arc shaped surface, wherein the arc shaped surface is configured to engage a circular disc spacer between agitating discs of an agitating shaft of an agitating screen. The arc shaped surface corresponds to an arc shape of the circular disc spacer. Each tine may further include a second end opposite the first end, wherein the second end may include a notch formed therein. Each tine may be coupled to the rake bar by the notch. The rake assembly scrapes debris stuck in the agitating shafts in response to operation of the agitating screen.

Abstract: Disclosed herein are disc filters for dewatering a fiber suspension. According to a first aspect, the disc filter includes a vessel comprising an inlet positioned in a wall of the vessel, the inlet introducing a fiber suspension into the vessel. The disc filter further includes a rotor shaft comprising a shaft axis of rotation positioned in a shaft plane, wherein the shaft plane is a horizontal plane. At least one filter element may be coupled to the rotor shaft. At least one injector may be positioned in the wall of the vessel, the at least one injector introducing a secondary flow of liquid into the vessel. The at least one injector may be located in the wall of the vessel at an injector elevation angle ?I that is greater than ?44 degrees and less than or equal to +22 degrees relative to the shaft plane.

Abstract: The present invention provides a combination screening apparatus for screening a mixed material into three graded streams, comprising a disc screen wholly, substantially or partly located within a rotary drum screen. The present invention may be conveniently arranged on a mobile chassis with a simple arrangement of a feed hopper to feed a feed end, and a layered or stacked configuration for the discharge of the so-formed graded streams at a discharge end.

Abstract: Disc screen for separating solid residues, which includes multiple parallel rotation shafts, each of which carries a plurality of discs fixed thereto. In addition, the disc screen includes multiple shaped rings, which are each constituted by multiple sectors removably mounted around the rotation shafts, and they are placed between the discs in order to simply and easily vary the screening section. The external edge of each shaped ring is provided with thrust sections, which are adapted to intercept the material to be screened in order to subject the latter to a greater stress, which facilitates a more efficient separation of the materials, and push upward components of light and filamentous material so as to prevent possible entangling and obstructions of such materials at the rotation shafts.

Abstract: A method for cleaning of a roller screen transporting and screening particles by means of at least three rotating rollers. The rollers are installed in succession at given clearances and arranged transversally in relation to the transport direction of the particles to screen a desired range of particle sizes. At least one roller changes its circumferential velocity and/or its rotational direction over time at defined time intervals for defined time periods such that for this defined time period for at least one pair of neighbored rollers one roller has a higher circumferential velocity than the other and/or both rollers roll in opposite rotational directions.

Abstract: A disc screen for separating solid residues which comprises multiple parallel rotation shafts, each of which carrying, fixed thereto, a plurality of discs. The lateral faces of the aforesaid discs are provided with thrust wings having curved section, which are adapted to intercept components of the material to be screened, in particular light or filamentous materials, in order to expel them outside the interspaces between the discs, so as to prevent possible tangling and obstruction of such materials at the rotation shafts.

Abstract: Device (100) for riddling materials such as, for instance, inert materials arising from demolitions or the like or inert materials for the building industry such as gravels, sands or the like, comprising at least two riddling rollers or drums (103, 102), wherein at least one of them can be moved with respect to the other so that the distance between the axis of rotation of said at least two rollers or drums can be changed according to the needs and/or circumstances.

Abstract: A multi-disc assembly for releasable attachment to the shaft of a disc screen is provided. The multi-disc assembly includes a multi-disc hub of elastomeric material including multiple discs configured for use in the disc screen. The hub has a through bore configured for direct engagement over a shaft of the disc screen. A disc screen comprising the multi-disc assembly and method of using the multi-disc assembly are also provided.

Abstract: A disc screen includes a shaft, a first disc mounted on the shaft, and a second disc mounted on the shaft. An interfacial opening (IFO) extends between the first disc and the second disc. A width of the IFO as measured between the first disc and the second disc varies according to a rotational position of the shaft.

Abstract: The invention refers to a screening machine, in particular a star screening machine, comprising at least two driven shafts provided with stars and/or discs, the shafts being arranged in a screening plane parallel spaced to each other, wherein the stars and/or discs are provided on different shafts staggered or comb-like engaging with each other, with a hopper or filling area in which the material to be screened can be filled. Wherein on the side facing the filling area in a plane above the screening plane and spaced parallel from it two distribution devices are provided one after the other in the direction of screening or conveying for distributing the material to be screened on the screening plane.

Abstract: An automatic sorting system identifying and sorting non-homogenous material includes a conveyor belt and an identification unit above the conveying surface for identifying material. The identification unit includes a projector projecting light downwardly onto material to be identified, which reflects light towards the identification unit. The identification unit includes a lens receiving the reflected light from the material, and a first processing unit linked to the lens for spectral analysis of reflected light captured by the lens to determine the nature of the material, and a second processing unit linked to the first processing unit for comparing spectral analysis results with data associated with different materials stored in a second processing unit database. A sorting unit links to the second processing unit and cooperates with the second end of the conveyor to sort material released from the second end depending on signals from the second processing unit.

Abstract: A mined ore processing apparatus to process mined ores, such as oil sands ore, into granular material is disclosed. An ore processor bed receives the ore to be processed. The ore processor bed has a frame supporting several rotating elements each separately driven to provide independent rotation rate and direction from the other. The ore processing bed is operable as a sizing device to decimate mined ore supply into granular material and separating it from rocks and other large lump mineral materials found in situ. The ore processing bed may be oriented to provide an upward inclination, which, when combined with alternating rotating element rotation directions, provides a crushing action to the ore material to crush larger rock. Alternately, a rock crusher is also provided to disintegrate oversized materials.

Abstract: The invention refers to a screen star, in particular for a screen machine, wherein the screen star is configured essentially disc-like and can be arranged on a shaft, wherein referring to the center of the screen star at least two outside-running star fingers are provided. The invention is characterized in that the length of the star fingers differs.

Abstract: A motor driven crusher for agitating and crushing material is provided. The crusher includes a frame removably coupled to a mechanical bucket and a plurality of shafts rotatably coupled within the frame and operationally coupled to the motor. The crusher further includes a plurality of crushing agitators coupled to each shaft of the plurality of shafts; and a plurality of screening spaces each having a predetermined spacing, wherein material placed on a top side of the crusher is agitated and crushed by the plurality of crushing agitators while the plurality of shafts rotate, screening small material through the plurality of screening spaces while crushing the larger material on the top side of the crusher to fit within the plurality of screening spaces.

Abstract: A partially releasable disc for processing recycling materials in general. More specifically a disc that is sufficiently flexible to function in heavy machinery without excessive wear while maintaining sufficient stiffness to avoid excessive fluctuations, wobbling, or other undesired excess deflection in the disc. An outer flexible portion may be wrapped around a less flexible core. A disc may comprise a plurality of outer impacting elements configured for engaging materials to be classified and propelling the materials in a conveying direction when a core is rotated. For ease of replacement, when the flexible portion is worn or damaged, the flexible portion may be removed without necessarily removing the inner core, saving labor and equipment expense when maintain a screen, such as the separation screens used for sorting recycled materials.

Abstract: A screening disk for use on a roller of a roller screen for screening an ore feed is disclosed, which includes first and second opposing side working surfaces, and provisions for mounting the screening disk on a shaft of the roller. At least one of the first and second side working surfaces has a plurality of protrusions operable to extend outwardly into an interstice between the applicable side working surface and a side working surface of an adjacent mounted screening disk. A spacer may be disposed in the one interstice for confining an extent of the one interstice to a region disposed generally between the third working surface and the shaft. A screening disk may have a keyway configured to receive a key for coupling the body of the screening disk to the shaft for rotation therewith.

Abstract: A screening machine is provided with a screening device and a screening device with multiple adjacent screen shafts disposed rotatable each of which being provided with a plurality of screen disks. The screen disks are made of rigid materials and are separated from one another in the axial direction by a clearance each. The screen disks of a screen shaft engage in clearances of the screen disks of adjacent screen shafts. Half of the screen disks are provided with a cleaning device for cleaning the clearances between the screen disks.

Abstract: The invention is a screen (1) for separating solid residues, comprising: a plurality of parallel rotary shafts (2) spaced from each other and associated with a supporting structure (3); drive means (4, 4a) of the shafts (2) suited to set them rotating around their longitudinal axis (Y); a plurality of screening discs (8) arranged spaced from each other along the rotary shafts (2) to which they are fixed through connection means (9); a plurality of anti-clogging sleeves (10; 20) coupled externally to the rotary shafts (2) and each included between two corresponding screening discs (8). A stabilizing body (11, 21) is arranged peripherally inside each one of the anti-clogging sleeves (10, 20).

Abstract: A disc for releasable attachment to a shaft of a disc screen apparatus includes a hub having a bore and a single split defining a pair of opposing ends. The hub also has at least one flexible portion intermediate the opposing ends that permits the opposing ends of the hub to be separated a predetermined distance sufficient to allow the shaft of the disc screen apparatus to pass between the opposing ends into the bore. The hub has plurality of outer impacting portions configured for engaging materials to be classified and propelling the materials in a conveying direction when the hub is rotated. A mechanism is provided to secure the hub to the shaft so that the shaft extends through the bore.

Abstract: A multi-disc assembly for releasable attachment to the shaft of a disc screen is provided. The multi-disc assembly includes a multi-disc hub of elastomeric material including multiple discs configured for use in the disc screen. The hub has a through bore configured for direct engagement over a shaft of the disc screen. A disc screen comprising the multi-disc assembly and method of using the multi-disc assembly are also provided.

Abstract: A device for sieving foreign bodies out of a material stream, wherein the device comprises a roller sieve comprising a plurality of rollers disposed in parallel to one another and discs disposed on the plurality of rollers such that they are perpendicular to the axial extension of the rollers, wherein the discs of adjacent rollers are engaged so as form slot areas between the discs and the adjacent rollers, and the discs comprise impulse discs for disaggregating a material stream disposed on the roller sieve, and conveyor discs for conveying the material stream in a transport direction and through the slot area. A corresponding process and an apparatus or system for the production of composite boards with such a device.

Abstract: A disc for releasable attachment to a shaft of a disc screen apparatus includes a hub having a bore and a single split defining a pair of opposing ends. The hub also has at least one flexible portion intermediate the opposing ends that permits the opposing ends of the hub to be separated a predetermined distance sufficient to allow the shaft of the disc screen apparatus to pass between the opposing ends into the bore. The hub has plurality of outer impacting portions configured for engaging materials to be classified and propelling the materials in a conveying direction when the hub is rotated. A mechanism is provided to secure the hub to the shaft so that the shaft extends through the bore.

Abstract: A multi-disc assembly for releasable attachment to the shaft of a disc screen is provided. The multi-disc assembly includes a multi-disc hub of elastomeric material including multiple discs configured for use in the disc screen. The hub has a through bore configured for direct engagement over a shaft of the disc screen. A disc screen comprising the multi-disc assembly and method of using the multi-disc assembly are also provided.

Abstract: A material separation screen includes multiple shafts mounted on a frame. Multi-diameter disc assemblies are mounted on the shafts and are configured to rotate and separate out different types of materials from a material stream. The multi-diameter disc assemblies include spacer discs that separately interlock together around the shafts. Compound discs are separately attached to the shafts next to the spacer discs. The spacer discs are made from a harder material than the compound discs to reduce spacer disc wear and to reduce the amount of material needed for fabricating the multi-diameter disc assembly.

Abstract: A motor driven crusher for agitating and crushing material is provided. The crusher includes a frame removably coupled to a mechanical bucket and a plurality of shafts rotatably coupled within the frame and operationally coupled to the motor. The crusher further includes a plurality of crushing agitators coupled to each shaft of the plurality of shafts; and a plurality of screening spaces each having a predetermined spacing, wherein material placed on a top side of the crusher is agitated and crushed by the plurality of crushing agitators while the plurality of shafts rotate, screening small material through the plurality of screening spaces while crushing the larger material on the top side of the crusher to fit within the plurality of screening spaces.

Abstract: An apparatus for sorting material, includes a frame, at least one first shaft rotatably mounted onto the frame, and at least one second shaft rotatably mounted onto the frame in a substantially adjacent and parallel relationship with respect to the at least one first shaft. The first and second shafts define a conveying surface along which material to be sorted is intended to travel via a rotation of the shafts. At least one single disc is mounted in a substantially transverse relationship with respect to the at least one first shaft. At least one compound disc is mounted in a substantially transverse relationship with respect to the at least one second shaft, each compound disc having a main disc and an associated secondary disc, each main disc having an outside perimeter greater than that of the associated secondary disc, each secondary disc being in alignment with the at least one single disc of an adjacent first shaft.

Abstract: A system and method for automated piezoelectric sensor-based tactile sorting of plurality of small objects. A high accuracy, high precision delivery system targets the sensor which accounts for softness and mass of individual objects by measuring a force exerted and total contact time for each object upon passing contact with a sensing surface of a piezo sensor, wherein a plurality of objects cascade onto the sensor in one-by-one fashion. The quantified force and contact time values are then analyzed and compared against two threshold values or a range of threshold values which are predetermined and preset based on data from optimal objects and undesirable objects or possibly a spectrum of objects which has been analyzed and recorded to assist in calibrating the system.

Abstract: A device (1) for sorting a harvested stream of fruit in bunches is mounted in a harvesting machine. The sorting device includes at least two transverse sorter bars (3) driven with a cyclic relative movement, the cyclic relative movement enabling longitudinal displacement of the stream over the bars, while opening passages (4) between them. The passages allow detached berries to drop under the sorting device.

Abstract: A motor driven agitator comprises a frame and a plurality of shafts rotatably coupled within the frame. The plurality of shafts are operationally coupled to the motor. The axes of the plurality of shafts are substantially parallel when coupled within the frame. The agitator further comprises a plurality of scalping agitators coupled to each shaft of the plurality of shafts. The agitator may further comprise a plurality of screening spaces each having a predetermined spacing. Material placed on a top side of the agitator is agitated by the plurality of scalping agitators while the plurality of shafts rotate, screening small material through the plurality of screening spaces while maintaining the larger material on the top side of the agitator. The agitator may be removably coupled to a mechanical bucket.

Abstract: A mined ore processing apparatus to process mined ores, such as oil sands ore, into granular material is disclosed. An ore processor bed receives the ore to be processed. The ore processor bed has a frame supporting several rotating elements each separately driven to provide independent rotation rate and direction from the other. The ore processing bed is operable as a sizing device to decimate mined ore supply into granular material and separating it from rocks and other large lump mineral materials found in situ. The ore processing bed may be oriented to provide an upward inclination, which, when combined with alternating rotating element rotation directions, provides a crushing action to the ore material to crush larger rock. Alternately, a rock crusher is also provided to disintegrate oversized materials.

Abstract: The invention refers to a screen star, in particular for a screen machine, wherein the screen star is configured essentially disc-like and can be arranged on a shaft, wherein referring to the center of the screen star at least two outside-running star fingers are provided. The invention is characterized in that the length of the star fingers differs.

Abstract: A disc for releasable attachment to a shaft of a disc screen apparatus includes a hub having a bore and a single split defining a pair of opposing ends. The hub also has at least one flexible portion intermediate the opposing ends that permits the opposing ends of the hub to be separated a predetermined distance sufficient to allow the shaft of the disc screen apparatus to pass between the opposing ends into the bore. The hub has plurality of outer impacting portions configured for engaging materials to be classified and propelling the materials in a conveying direction when the hub is rotated. A mechanism is provided to secure the hub to the shaft so that the shaft extends through the bore.

Abstract: An apparatus for sorting material, includes a frame, at least one first shaft rotatably mounted onto the frame, and at least one second shaft rotatably mounted onto the frame in a substantially adjacent and parallel relationship with respect to the at least one first shaft. The first and second shafts define a conveying surface along which material to be sorted is intended to travel via a rotation of the shafts. At least one single disc is mounted in a substantially transverse relationship with respect to the at least one first shaft. At least one compound disc is mounted in a substantially transverse relationship with respect to the at least one second shaft, each compound disc having a main disc and an associated secondary disc, each main disc having an outside perimeter greater than that of the associated secondary disc, each secondary disc being in alignment with the at least one single disc of an adjacent first shaft.

Abstract: Discloses a mined ore processing apparatus to process mined ores, such as oil sands ore, into granular material. An ore processor bed receives the ore to be processed. The ore processor bed has a frame supporting several rotating elements each separately driven to provide independent rotation rate and direction from the other. The ore processing bed is operable as a sizing device to decimate mined ore supply into granular material and separating it from rocks and other large lump mineral materials found in situ. The ore processing bed may be oriented to provide an upward inclination, which, when combined with alternating rotating element rotation directions, provides a crushing action to the ore material to crush larger rock. Alternately, a rock crusher is also provided to disintegrate oversized materials.

Abstract: A motor driven agitator comprises a frame and a plurality of shafts rotatably coupled within the frame. The plurality of shafts are operationally coupled to the motor. The axes of the plurality of shafts are substantially parallel when coupled within the frame. The agitator further comprises a plurality of scalping agitators coupled to each shaft of the plurality of shafts. The agitator may further comprise a plurality of screening spaces each having a predetermined spacing. Material placed on a top side of the agitator is agitated by the plurality of scalping agitators while the plurality of shafts rotate, screening small material through the plurality of screening spaces while maintaining the larger material on the top side of the agitator. The agitator may be removably coupled to a mechanical bucket.

Abstract: Method and device for separating letters by transporting a pile of non-separated and unordered letters by a conveyor band in a continuous flow of essentially non-superposed letters which are largely distributed on said conveyor band. At least one retention plate which is fixed to an axis of rotation in a radial direction with respect thereto rotates around the axis of rotation, which is transversally arranged with respect to the transporting direction of the conveyor band, horizontally and above said conveyor band in such a way that the retention plate arranged under the axis of rotation has a velocity component oriented in the opposite direction to the direction of travel of the conveyor band.

Abstract: A mechanical bucket for separating small material from larger material. The mechanical bucket includes a bucket adapted to receive and retain material within the bucket and a roller screen assembly removably secured to a bottom portion of the bucket. The material received within the bucket rests on the roller screen assembly when deactivated. The roller screen assembly is adapted to separate smaller material from larger material of the material received within the bucket when activated. The mechanical bucket may include a scraper device for removing debris from the roller screen assembly when the roller screen assembly is activated.

Abstract: Multiple shafts are aligned along a frame and configured to rotate in a direction causing paper products to move along a separation screen. The shafts are configured with a shape and spacing so that substantially rigid pieces of the paper products move along the screen while non-rigid pieces of the paper products slide down between adjacent shafts. In one embodiment, the screen includes at least one vacuum shaft that has a first set of air input holes configured to suck air and retain the non-rigid paper products. A second set of air output holes are configured to blow out air to dislodge the paper products retained by the input holes.

Abstract: Methods and systems are provided for controlling an automatic separator apparatus of a Materials Recovery Facility. A separator for separating a stream of recyclable paper and containers into a paper stream including primarily paper and a container stream including primarily containers is provided. The separator has at least one adjustable operating parameter. A first detector detects an amount of container contaminants in the paper stream. A second detector detects an amount of paper contaminants in the container stream. A control system operably connected to the separator and the first and second detectors adjust the adjustable operating parameter so as to reduce a combined measure of contaminants in the paper stream and in the container stream.

Abstract: Methods and systems are provided for controlling an automatic separator apparatus of a Materials Recovery Facility. An input stream of recycled materials is provided, wherein the composition of the input stream is subject to variation during a time interval. The input stream passes through a separator machine having a plurality of adjustable machine operating parameters. Via a computerized control system the first one of the operating parameters is adjusted for monitoring the quality of separation achieved by the separator machine so as to select a value of the first parameter that improves the monitored quality of separation. This process is continued for each of the other adjustable parameters of the separator machine, and then the process is repeated so as to continuously adjust the operating parameters of the separator machine to optimize its efficiency of separation.

Abstract: A separation system includes an air separator that in one embodiment primarily receives Municipal Solid Waste (MSW) containing relatively light MSW recyclable materials such as paper, cardboard, plastic containers, and/or metal containers. The air separator blows the relatively light MSW recyclable materials up though a chamber and onto a first conveyer while the other relatively heavy MSW material drops down a chute onto a second conveyer. A separation screen receives the relatively light MSW recyclable materials from the air separator and separates the relatively flat paper and cardboard from the plastic and metal containers.

Abstract: A modular multi-disc assembly for use in material separation screens and a method of application to those screens are provided. The modular multi-disc assembly includes an inner securing hub that clamps onto the drive shaft of a material separation screen. The modular multi-disc assembly further includes an outer multi-disc module split into halves with each half mounting separately onto the inner securing hub. Multiple discs can be replaced at one time as opposed to replacing each individual disc in a typical screen. The inner securing hub spaces the outer multi-disc module away from the drive shaft so that the primary wear concern reduces to the resilient discs on the outer multi-disc module, allowing for multiple outer multi-disc module replacements before needing to replace the inner securing hub.

Abstract: An adjustable apparatus for sizing objects, mainly delicate foods, by the rotation of a set of at least 7 rollers, each roller having one less tooth so that the rollers move at progressively higher revolutions per minute, from the in-feed shear roller of 144 revolutions per minute to the discharge roller of 210 revolutions per minute. The rollers are shaped and finished by 7 to 12 flats, alternated with a crown in between each flat, cut the horizontal length of the roller. The rollers are then sandblasted over the entire circumference of the surface to a depth range of 280 to 300 micro-inches.

Abstract: A disc screen apparatus for classifying a stream of mixed recyclable materials of various sizes and shapes, including newspaper, clean mixed paper, magazines, plastic bottles, glass bottles and jars, cans, and the like. The apparatus has an inclined fixed first disc screen section and an inclined articulating second disc screen section whose angle of inclination can be independently adjusted via a hydraulic cylinder or other angular adjustment mechanism in order to improve the separation of newspaper and/or clean mixed paper without impairing the ability of the fixed disc screen section to separate mixed containers. The first and second disc screen sections are supported by first and second frames that carry the parallel driven shafts and discs that form the disc screen sections. The frames have complementary mating surfaces that limit the range of articulation of the second disc screen section.

Abstract: An apparatus for longitudinally orienting pre-glued elongated wood strands for forming OSB panels includes a spreading head with disc rolls that each have discs arranged parallel to one another on a rotatable shaft arranged over a forming belt. The discs of a given disc roll intermesh overlappingly in the interspaces between the discs of the adjacent disc rolls, to form vertical orienting passages between the intermeshing discs. The shaft or the individual discs of at least one of the disc rolls is/are slidably adjustable in the axial direction of the shaft, to adjust the axial width of the orienting passages. In a method of operating the apparatus, the width of the orienting passages is adjusted depending on the dimensions, the dimensional variation or tolerance, and/or the throughput quantity of the supplied strand material. Thereby, the throughput quantity and the longitudinal orienting of the strands can be optimized, depending on the particular strand material.

Abstract: Device for separating fine fractions and coarse fractions from bulk goods, comprising a frame and a screen plane supported by it for supporting the coarse fraction and allowing the fine fraction to pass through, the screen plane being formed by a number of screen disks, that have been arranged in groups and detachably on rotating driven shafts, the shafts on both sides being bearing mounted with bearing ends in first and second bearings on the frame and at at least one end being in driven engagement with driving means, the bearing ends being divided into a shaft member permanent to the shaft and a bearing member bearing mounted in the first and second bearings on the frame, which bearing member inter-engages with the permanent shaft member for co-rotation therewith, wherein in both bearing ends the permanent shaft member and the bearing member can be coupled to each other and can be uncoupled from each other by a movement of the shaft transverse to the main direction of the shaft.

Abstract: A shale shaker having a basket for holding screen assembly apparatus, screen assembly apparatus for treating fluid introduced to the shale shaker, a roller bed assembly secured above and/or to the basket above the screen assembly apparatus, the roller bed assembly having a plurality of spaced-apart rotatable rollers, the fluid initially introduced to the shale shaker onto the roller bed assembly. The shale shaker wherein the fluid is drilling fluid with large undesirable solids therein, said large undesirable solids separable from the drilling fluid by the roller bed assembly.

Abstract: A disc screen apparatus has a generally V-shaped configuration with a lowermost region that provides a trough and a pair of vertically inclined regions. Mixed recyclable materials deposited onto the trough are agitated and classified with different types of material falling through the discs of the trough, falling off one end of the trough, and falling off upper terminal ends of the inclined regions.

Abstract: Apparatus (10) and method to separate a loose mass formed by elements or materials (11) of different sizes, such as woody strands or wafers, comprising a separation chamber (13) into which the mass is inserted, a plurality of riddling rolls (16), mounted inside the chamber (13) rotating on axes of rotation parallel to each other and lying sybstantially on a same plane (X). Each of the riddling rolls (16) comprises a plurality of riddling elements (20), each of which is substantially square in shape, so as to form four cusps (22) in correspondence with the four tips of the square. The riddling elements (20) are adjacent to each other so that the cusps (22) form a plurality of grooves (24), and the riddling rolls (16) are axially staggered therebetween so that the cusps (22) of each roll (16) are constantly inserted, more or less deeply into the corresponding grooves (24) of the adjacent riddling roll (16), so as to define discharge apertures (25) with an alternated profile.

Abstract: A rotary filter (1) for fibrous suspensions (S) is disclosed comprising a rotor (2) coaxially arranged inside a filtering basket (4), an annular hollow space (8) being defined between them. In the annular hollow space (8) there are one or more wing profiles (15) fixed to the outer lateral surface (2a) of the rotor (2) extending in an axial direction along the rotor (2). The outer surface (16) of each wing profile (15) facing the filtering basket has one or more discontinuity zones (16b, 16d) whose points have an increasing distance from the longitudinal axis (3) of the rotor (2).when running on the outer surface (16) of said wing profile (15) in a direction opposite to the rotation direction (V) of the rotor (2).