Abstract: Apparatus for screening pulp suspensions is provided, including a housing, a rotary screen within the housing, a screen chamber between the rotary screen and the housing, a reject outlet, an accept outlet, an outer screen surface defining the outer surface of the screen chamber, a bottom screen surface defining the lower surface of the screen chamber, a slot ring at the bottom screen surface and adjacent to a knob ring at the lower end of the rotary screen, and an adjustment screw for adjusting the size of the gap between the knob ring and the slot ring from outside of the housing.

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

Abstract: A material processor having an enclosure with an ingress to receive material into the enclosure, and a discharge to remove material from the enclosure. A spindle is located in the enclosure, has a longitudinal spindle axis, and is rotatable about the spindle axis. A drive is operatively connected with the spindle to rotate the spindle about the spindle axis. A centrifugal sieve is located in the enclosure and coupled with the spindle. The ingress feeds material into the sieve. A conveyor is connected with the discharge to transfer material from the enclosure. The conveyor further has a generally cylindrical tube with a tube diameter, two opposing ends, and a tube axis extending through the ends. A helical blade extends along the tube axis between the two ends and is rotated about the tube axis. More particularly, the helical blade may have a series of blade tips that are spaced along the tube axis.

Abstract: A material processor having an enclosure with an ingress to receive material into the enclosure, and a discharge to remove homogenous material from the enclosure. A spindle is located in the enclosure, has a longitudinal spindle axis, and is rotatable about the spindle axis. A drive is operatively connected with the spindle to rotate the spindle about the spindle axis. A centrifugal sieve is located in the enclosure and coupled with the spindle. The ingress feeds material into the sieve. A conveyor is connected with the discharge to transfer mixed material from the enclosure. The conveyor further has a generally cylindrical tube with a tube diameter, two opposing ends, and a tube axis extending through the ends. A helical blade extends along the tube axis between the two ends and is rotated about the tube axis. More particularly, the helical blade may have a series of blade tips that are spaced along the tube axis.

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 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: A backwash strainer including a body, a strainer element having an inlet side contained in the body, and a space defined between the body and the strainer element. The body includes an inlet to the strainer element and an outlet from the annular space. A nozzle for directing cleaning fluid against the inlet side of the strainer element for dislodging particulate matter from the inlet side of the strainer element mounts to the body. A backwash arm for collecting the cleaning fluid and dislodging particulate matter mounts to the body. The backwash arm is positioned adjacent to and is in close proximity to the inlet side of the strainer element and the nozzle. The backwash arm has an axially extending slot defined by two spaced members having ends positioned adjacent to the nozzle. The backwash arm and the nozzle together may be moveable about a central axis relative to the strainer element.

Abstract: A method of and apparatus for separating knots from a fibre suspension in the wood processing industry. A known problem in the prior art has been the quick wear of the screen surface of the knotter when the screen surface has been profiled. On the other hand the ability to separate with an unprofiled screen has not been satisfactory. When using a profiled screen cylinder (5), it has been noticed in performed tests that it is preferable to feed the pulp from the connections (2) in the direction of rotation of the screen cylinder and also to discharge the reject from connections (4) and the accept from the connections (3) in the direction of rotation of the cylinder (5). Accordingly, there is not only less wear of the screen surface, but also a significantly smaller consumption of power per pulp ton than in the prior art apparatuses.

Abstract: In screening apparatus for paper fiber stock of the type wherein a cylindrical perforate screen member defines screening and accepts chambers on the inner and outer sides thereof in a closed, pressurized housing, the inlet chamber for stock to be screened is located below the screening chamber to facilitate elimination of high specific gravity reject materials before the stock reaches the screening chamber. Special provision is made for accelerating the flow of plastic and other reject materials of lower specific gravity than wet paper fibers to a reject chamber above the screening chamber, and special provision is also made for preventing recirculation of such reject materials to the lower end of the screening chamber and thereby concentrating them in the reject chamber from which they are removed by way of a dewatering device that delivers essentially dry reject material for ready disposal while preventing the escape of pressure from the housing.

Abstract: A vertical type screening machine for granular material comprises a housing. A rotary drum assembly is rotatably mounted within the housing and comprises a drum having a substantially vertical rotary axis and a helical blade helically wound around a circumferential surface of the drum. A cylindrical screen member disposed between the drum assembly and the housing cooperates with a peripheral wall of the housing to define therebetween a first chamber and cooperates with the circumferential surface of the drum to define therebetween a second chamber. The granular material to be screened is introduced into the top of the second chamber. Upon the rotation of the drum assemby, the granular material introduced into the top of the second chamber is moved toward the bottom of the second chamber by the helical blade and due to gravity.

Abstract: An improved system for the production of digested pulp from wood chips and knots which includes a separating apparatus, connected to the digester output, capable of separating knots from partially cooked wood chips and fibers at the digester pressure and consistency. The separated fibers and fiber bundles pass to a refiner where the fiber bundles are mechanically reduced to fibers in a liquid environment at a high consistency and at the digester pressure. The knots are then re-cycled to the digester or other processes.The separating apparatus above uses a plurality of rotating members such as intermeshing screws or grooved rolls, arranged in a vertical screen to separate an inlet chamber from an outlet chamber. Knots cannot pass through the rotating members and thus are driven out of an outlet which communicates with the inlet chamber. The fibers, however, do pass through the rotating members to the outlet chamber and exit therefrom by a second outlet.

Abstract: A treatment chamber for purification and fractionation of materials suspensions, particularly fibrous suspensions under pressure, and wherein the treatment chamber includes a rotary screening drum provided with pulsation members, the drum also including screening holes located on the back-side of, or immediately behind, the pulsation members as viewed in the direction of drum rotation.

Abstract: An apparatus for effecting purification and fractional separation of a material suspension, which includes a screening assembly of the closed centripetal type comprising an outer annular chamber with a stationary outer shell and also an inward rotatable drum, together with an inner annular chamber which is radially outwardly defined by said first drum and radially inwardly by a second screening drum, an improvement in the efficiency of the separatory apparatus consists in providing means for creating pulsating waves in the suspension in association with said first rotating screening drum.