Abstract: A method and device are used for separating particles of plastic foil from organic material. The device includes a chamber with a perforated wall. A mixture of particles of plastic foil and organic material is fed into the chamber through a feed opening. The mixture is set into a rotating movement inside the chamber by a rotor. In the vicinity of the perforations, the centrifugal force to which a particle is subjected is at least fifty times greater than the gravitational force to which the particle is subjected. An airflow is generated in the chamber parallel to the rotational axis of the rotor. Particles of organic material leave the chamber through the perforations. Particles of plastic foil are carried along by the first airflow and then discharge through an opening in the chamber.

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 separator is used in conjunction with a grinding mill which has a suction assembly, a grinding device, regulating devices and a driving device. The separator is mounted in a main body of the grinding mill on a rotating vertical separator shaft, comprising two support rings of equal sizes and shapes, mounted on the separator shaft with parallel orientations, having radial bridges with openings in between, which are surrounded by a plurality of mounting holes; and a plurality of blades, hingedly mounted on the mounting holes by vertical rods, for separating ground particles according to size.

Abstract: A screen cylinder (125) used for screening cellulosic fibrous material pulp in the pulp and paper industry incorporates first (66) and second (67) downstream surfaces (16) having contoured slopes that form a funnel entrance of the grooves (13) at the screen cylinder slots (17). The contoured construction of the screen cylinder (125) effects greatly enhanced utility compared to conventional milled and discrete element screen cylinders, including substantially avoiding the Coanda effect.

Abstract: Apparatus for separating a fiber suspension is provided including a housing with an upper chamber in the upper portion thereof, a rotor rotatably mounted in the housing, a first rotary screen mounted for rotation with the rotor and dividing the housing into a first screen chamber and a first accept chamber, a second screen radially outward from the rotor defining a second screen chamber, the diameter of the first rotary screen being less than that of the second screen, the first rotary screen being located within the second screen, an inlet, a reject outlet, at least one accept outlet and a stator within the first rotary screen including at least one pulse member for creating a pulse within the first rotary screen, the diameter of the housing being less than the diameter of the second screen and the first rotary screen being separated from the second screen chamber and located at least partially within the second screen chamber.

Abstract: Pressurized screen to remove contaminants from a contaminant-containing fibrous paper suspension. Pressurized screen includes a housing, a first screen element, essentially axially symmetric and rotatably mounted within housing, and a second screen element, which is essentially axially symmetric. First and second screen elements are successively arranged in suspension flow direction. At least one intake, coupled to housing, supplies suspension to housing, and at least one accepts outlet, coupled to housing, conveys a part of suspension that passes through the second screen element out of housing. At least one coarse reject outlet is located within housing to remove a part of suspension not passing through first screen element, and at least one fine reject outlet is located within housing to remove a part of suspension not passing through second screen element. First screen element includes conical shape with opening angle (&agr;) between about 10° and 170°.

Abstract: An integrated system for diverting and reducing the size of waste materials in an effluent stream comprising a frame having a bottom housing and a top housing and mountable in the stream. A grinder unit is mounted to the frame bottom housing and comprises a cutter assembly positioned in the stream and a drive mechanism coupled to the cutter assembly to rotate the cutter assembly. The drive mechanism may be electric or hydraulic. A diverter unit is mounted to the frame. It may be a single diverter or dual diverters. The diverter unit comprises a cylindrical drum rotating on a stub shaft. It may also be a helical coil. A drive assembly operably couples the drive mechanism to the drum shaft to rotate the cylindrical drum as the cutter assembly rotates. In operation the diverter unit is positioned side by side to the grinder unit to diverts solids in the effluent stream toward the grinder unit for size reduction. Side rails are employed for flow control around both the diverter unit and the grinder unit.

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 particle size classifier in which feed material composed of product and overs moves downwardly through a separator unit by the action of negative pressures created by a first air blower associated with the collection of product and a second air blower associated with the collection of overs. As the feed material moves downwardly, the product and the overs are separated with the product passing from within a screen unit to outside the screen unit and the screen unit preventing passage of the overs. Blowback air, applied to the screen unit from the outside cleans the cylindrical screen unit to permit continued passage of product through the screen unit.

Abstract: The invention concerns the design of classifying wheel made of a waterproof sintered material with vanes arranged in a ring that run parallel to the rotational axis and that are positioned between the hub-bearing circular disc and an annular cover disc, whereby the flow of the classifying air through the vanes is contrary to the centrifugal direction of the classifying wheel. Described is a classifying wheel design which permits manufacture of such a classifying wheel in an economical manner with a high degree of manufacturing accuracy even if the classifying wheel has an outside diameter in excess of 250 mm and which ensures the required degree of fracture resistance for any standard sintered material. This is achieved in that the classifying wheel is made up of simple ring elements joined together by a self-sintering filler, e.g. an adhesive, introduced into the gaps between the ring elements.

Abstract: The present invention provides a rotary classifier for a roller mill, in which a rotating vane is formed so that the vane width at the upper part of the rotating vane is larger than that at the lower part.

Abstract: A rotor for mechanical air classifiers of the type having a hollow cage-like rotor is provided with a plurality of entering openings for air and classified material, the entering openings being generally equidimensionally shaped.

Abstract: Screening cylinders for screening lignocellulose-containing fibrous material are disclosed. The cylinders are formed from longitudinal bars separated by gaps, and support rings extending around the circumference of the cylinders to support the bars, as well as longitudinal strips whose outer surfaces are a greater distance from the support rings than are the bars.

Abstract: A separation device for suspensions comprises a housing (1), a filter body (3) with a wall of filter material situated in the housing, spray means (14) adapted to spray jets of a suspension to be separated directly onto one side of the wall of filter material, and means (4, 6) for displacing the filter body relative to the spray means. According to the invention the filter body forms a substantially circular cylindrical drum (3) with a vertical center axis, the circumferential wall of the drum comprises said wall of filter material. Further, said displacement means (4, 6) is adapted to turn said cylindrical drum about said vertical center axis during operation.

Abstract: A backwashable self-cleaning strainer has a vertical housing containing a rotatable strainer basket. The housing has an inlet adjacent the top thereof and an outlet adjacent the bottom wall, with a flush discharge opening in the bottom wall. Components for rotating the strainer basket are located outside the flow of water containing particulates that enters the housing. A hollow backwash conduit with a passage through the sidewall is positioned adjacent the inner surface of the strainer basket and communicates with a sealable aperture in the wall of the housing. Upon opening of the aperture, cleaned water flows through the side wall of the strainer basket, removing particulates therefrom, and out the hollow backwash conduit. An intermittently rotatable brush is also provided to brush the inner surface of the strainer basket.

Abstract: A device for screening pulp suspensions includes a cylindric housing (1) with inject inlet (2), reject outlet (3) and accept outlet (4) and screening members in the form of a stator (5) and a rotor (8). The stator (5) as well as the rotor (8) include a plurality of annular elements (6 and 9, respectively), which are arranged in a mutual spaced relationship. The rotor (8) is located radially outside the stator (5), so that the rotor elements (9) are located directly in front of the spaces between the stator elements (6), and the axial length of the rotor elements is greater than the spaces between the stator elements. Thereby gaps (11) are formed between the stator elements and rotor elements.

Abstract: A stemmery discard of tobacco and soil particles is fed to an air/centrifugal separator in which a fraction of smaller tobacco particles is recovered with a low amount of soil. The residue from that separator is fed to a screen separator in which a fraction of larger tobacco particles is recovered with a low amount of soil. A residue from the rotary screen separator is fed to a gravity separator which recovers as much tobacco as possible without exceeding a preselected amount of soil. The screen separator may comprise a first separator screen to separate out a fraction of larger tobacco particles, and a second screen to separate out a fraction of smaller tobacco particles from the particles falling through the first screen; the particles retained by the second screen would be sent to the gravity separator, and the separated-out smaller particles would be discarded.

Abstract: A self-cleaning strainer comprises a vertically disposed housing which contains a rotatable strainer basket. The housing has an open top, closed by a closure plate, an inlet adjacent the top of the housing and an outlet adjacent a closed bottom of the housing, the closed bottom having a flush discharge opening. The components used to rotate the strainer basket are disposed outside the flow of any water containing particulates that enters the housing. Cleaning devices such as a scraper blade supported in the strainer basket, a rotatable brush supported in the strainer basket, and a water jet manifold disposed between the housing sidewall and the sidewall of the strainer basket are used to clean the rotatable strainer basket.

Abstract: Vertical screening device (1) having at least one cylinder screen (2) and connectible with its lower end portion (8) to a similar screening device or a drive unit and, with its upper end portion (7), to a similar screening device or a distributor device. The screening device is adapted, together with the other devices connected to it, to be imparted a movement of rotation. The invention is charaterized in that the screening device (1) comprises a bearing device (3) for supporting a feed screw (4) cooperating with the cylinder screen (2). The bearing device (3) is disposed within the cylinder screen (2) and fixedly connected thereto. The feed screw (4) is connected through a link (5) extending outside the periphery of the cylinder screen (2), to a fixed point (6) provided outside the screening device (1) for holding the feed screw (4) stationary.

Abstract: A pressure sorter for fiber suspensions comprises a rotating screen basket and cleaning blades associated therewith. To improve the operating characteristics, stationary cleaning blades are provided on both the inside and the outside of the screen basket, and the screen basket is provided at one end with an axial channel whose diameter is substantially smaller than that of the screen formed by the screen basket.

Abstract: A screening apparatus for granules or the like material comprises a housing, wherein a frame structure is arranged which is rotatable about a main axis. The frame structure supports a screen drum which is rotatable by means of a shaft arranged eccentrically with respect to the main axis. In order to readjust the screening apparatus from screening one material and to screen another material which needs another contribution of the centrifugal force from the planetary movement of the screen drum, the eccentrically of the screen drum with respect to the main axis is variable.

Abstract: A screen basket for centrifugal deliquefying and/or classifying of particulate solid and solid-liquid mixtures, the basket being fed internally, rotating about a vertical axis and on initial installation presenting for driving engagement with the mixture fed into it an axially serrated internal screening surface formed by laterally inwardly and forwardly sloping bases of laterally spaced axially extending screen wires having as mixture-engaging serrations radially instanding leading edges.

Abstract: A screening apparatus for grains comprises a housing, wherein a support structure is arranged which is rotatable by means of a main shaft. The support carries a screen drum rotatably mounted upon a planet shaft arranged eccentrically with respect to the main shaft. The support, furthermore, carries vanes engaging a delivery channel for the screened goods. In order to achieve a comparatively small resulting centrifugal force effect upon the material fed to the screen drum, while maintaining optimal peripheral speeds as regards the delivery vanes and the speed of the screen drum, the screen drum is arranged with an eccentricity with respect to the main shaft which is smaller that the greatest radius of the screen drum.

Abstract: A classifier for separating particulate matter into relatively coarse and fine particles. The classifier includes a casing, at least one cylindrical screen assembly mounted in the casing and extending substantially in the direction in which the particulate matter flows in the casing for forcing the fine particles to traverse the cylindrical screen assembly, and at least one air purge pipe disposed in the casing for blowing air against the screen assembly to remove particles off the screen assembly, the cylindrical screen assembly and the air purge pipe being relatively movable by a drive mechanism. The cylindrical screen assembly has an increased degree of mechanical strength and rigidity, and provides a wide effective area available for screening.

Abstract: A process for the dewatering and particle classification of solids from suspensions, e.g. coal from a slurry in which the coal is transported, makes use of a dewatering centrifuge having two frustoconical centrifuge drum sections of different inclinations such that in a first filtering zone the particles are preliminarily dewatered and then pass by automigration to the next centrifuge drum at which further dewatering takes place. The suspension on the first sieve surface forms a thin layer classification zone having a thickness up to 5 mm and in which the coarse fraction is retained while the fine fraction is passed. The coarse fraction automigrates to the next sieve surface where it is dewatered and the fine fraction separated out in the thin layer classifying zone is then filtered under pressure in a subsequent stage.

Abstract: A screen drum and a method for its manufacture is disclosed wherein the screen drum comprises at least two cylindrical screen members spaced apart, between which a stiffening ring is disposed. The stiffening ring has two cylindrical surfaces which guide the ends of the cylindrical screen members, and a projecting part between them. The cylindrical screen members and the stiffening ring are attached to each other by a weld joint connecting the projecting part of the stiffening ring and the ends of the cylindrical screen members and filling the gap between them.