Abstract: A method and mechanism including a housing having a screening chamber therein with a cylindrical screen and foils rotating past the surface of the screen with the housing having circumferentially spaced outlets which are at nonuniform circumferential locations, are different in number than the foils, and lead to a common manifold which will lead to a paper machine headbox. An air dome is at one end of the chamber.

Abstract: A mechanism for screening a stock slurry for a paper making machine including a cylindrically shaped tubular screen with a stock supply at one end and a discharge at the opposite end for rejected stock and an annular receiving chamber outwardly of the screen for material which passes the screen and rotating axially extending foils within the screen, each foil having a rib projecting radially inwardly and extending in a helical direction at an angle to the foil to move the stock from the supply end of the screen to the discharge end.

Abstract: An apparatus for defibering conglomerates of fiber in fibrous suspensions, particularly useful with fibrous suspensions of low stock density, comprising a housing having an inlet and outlets for the fibrous suspension, a hollow cylinder within the housing, and a rotor mounted for rotation within the hollow cylinder. The annular space between the hollow cylinder and the rotor comprises a first region to dewater and screen the fibrous suspension and a second region to defiber conglomerates of fiber in the dewatered portion of the fibrous suspension. In a preferred embodiment, the annular space comprises a third region to wash dirt particles from the processed fibrous suspension and also to dilute said suspension to accommodate a further screening operation.

Abstract: An apparatus for cleaning fibrous suspensions of low stock consistency comprising, in combination, a specially adapted vortex cleaner and pressure screen. The vortex cleaner has a cone angle of less than 20.degree., between 7.degree. and 15.degree. in a preferred embodiment, to increase the residence time therein. The pressure screen comprises a rotor having a lower surface with acceleration elements to set the suspension in motion within the vortex cleaner while effectively sealing the space between a stationary screen basket and the rotor of the pressure screen to prevent short-circuiting of the fibrous suspension directly from the vortex cleaner inlet into the pressure screen. The rotor has a central opening in the lower surface thereof to accept the suspension leaving the vortex cleaner and further comprises peripheral openings in flow communication with this central opening through which the suspension passes to enter the annular space between the rotor and the screen basket.

Abstract: A method of screening paper fiber stock incorporating a screen member having generally circular perforations and a rotor supporting vanes movable in the supply chamber, the rotor vanes are spaced from the screen member by a substantial distance (3/16"-1/2") to establish a tubular layer of stock of corresponding radial thickness adjacent the screen member, the rotor is operated at high speed to develop strong hydraulic shear forces in the tubular layer of stock causing tangential orientation of predominantly two-dimensional contaminant particles, and ribs on the inlet side of the screen member cause the stock to be continuously recirculated in the supply chamber to prevent undue increase in the consistency of the stock in the tubular layer, thereby enabling the screen to operate effectively at high capacity and high stock consistencies.

Abstract: The pressurized screening apparatus for screening fibrous material in liquid suspensions includes a fixed cylindrical screen mounted within a housing to form an inner chamber. An axially extending annular channel receives the suspension. A dilution liquid is passed tangentially into the channel. The dilution liquid helps in the separation of the acceptable fibers from the undesired constituent so that a large proportion of the acceptable fibers is fed through the cylindrical screen and a minimal amount of undesired material flows to the bottom of the annular channel as part of the rejects.

Abstract: Apparatus for separating a fibrous suspension of raw stock into acceptable stock and waste material in which an inlet at one end of a casing directs raw stock against a conical plate closing one end of a rotor in the housing and into an annular elongated inner chamber formed beween the imperforate peripheral wall of the rotor and a stationary cylindrical screen surrounding the rotor in the housing so that acceptable stock passes through the screen into an outer space from which it can be removed through a suitable outlet and waste material is directed by elongated angularly inclined ribs on the outer surface of the rotor wall into a turbulence chamber in which a radially extending rib on the other end of the rotor acts on the stock and from whence relatively light waste material is removed through a tangentially extending outlet at the top of the casing and relatively heavy material is removed through an outlet at the bottom of the casing and in which diluent water is introduced into the turbulence chamber th

Abstract: A fiber classifying mechanism and method including a first chamber having an inlet for receiving fibers to be classified carried in a fluid suspension and having an outlet from the same chamber. A second chamber receives a controlled split of flow from the first chamber through a screen between the chambers having openings of a size to pass reject fibers. Means are provided for controlling the split of flow by a valve in the outlets from the respective chambers so as to control the flow through the screen. A foil moves past the screen to agitate fibers collected on the surface of the screen.

Abstract: In a screening machine of the type having a perforated cylinder through which the material being screened is passed and a rotor for maintaining the cylinder perforations open, failure of the cylinder due to torsional forces imposed on it by rotation of the rotor is prevented by providing several beam-like cantilevers which extend longitudinally of the cylinder and resist the twisting, torsional forces imposed on the cylinder during screening operations. Intermediate reenforcing rings, which are designed to withstand radially directed loads imposed on the cylinder, are restrained against movement longitudinally of the cylinder by means of clips which are welded to the cantilevers on opposite sides of each of the rings. The cantilevers, therefore, also serve as an area on the cylinder to which the clips can be welded, eliminating the necessity of making welds at undesirable locations near perforated portions of the cylinder.

Abstract: A device enabling the separation and removal of cementitious material from a concrete mix contained within a concrete mixer is provided. The concrete mixer, usually of the mobile type mounted on a land vehicle, comprises essentially, a drum or mixing vessel, a discharge or dump outlet and means for introducing water into the drum. The instant device comprises restraining and diverting member adapted to be positioned in alignment with said outlet, pulley means, for example pivotally mounting the device on the cement mixer enabling movement of the device from a position aligned with said outlet to a position displaced from said outlet, latch means for securing the device in aligned position with said outlet, and means for moving said device to a position out of alignment with said outlet, as required for normal operation of the concrete mixer.

Abstract: Device for gluten washing including a cylinder of increasing diameter having protruding helical flights. The cylinder presents an outward surface of peaked, elbow-shaped ridges. The cylinder and its helical wings are encompassed by a cylindrical, screen stator and the whole set at an angle above the horizontal in an enclosing tank. The bottom end of the stator is partially open to communicate with a feed hopper while the upper end, along with the cylinder, is subject to spray nozzles. A recirculation system conducts liquid from the bottom to the top of the tank.

Abstract: Screening apparatus for paper fiber stock and other fiber suspension is especially designed to handle relatively suspension containing stringy material. A perforate screen cylinder forms the outer wall of the supply chamber for the stock to be screened, and a rotor operates in the supply chamber and includes vanes which travel in spaced relation with the inner wall of the screen cylinder. These vanes are supported on the rotor hub by imperforate arms of substantial axial extent which act as propeller blades to maintain a high rate of circulation of the stock within the supply chamber and also to direct the stock toward the reject collecting chamber from which stock is continuously discharged at a high volumetric rate approaching or equal to the rate of discharge of accepted stock. Helical ribs on the inner surface of the screen cylinder aid in channeling the flow of reject-containing stock toward the reject outlet.

Abstract: A classifying apparatus is disclosed for use in separation of different portions of fibrious suspensions such as waste papers stock coming from a pulper. The apparatus is a unit comprising a vortex cleaner combined with a pressure screen. It includes a cylindric rotor whose circumferential portion carries agitating rods for the screen, the bottom of the rotor being provided with means for intensifying the motion of the stock fed into the vortex cleaner portion of the apparatus. The cylindric rotor defines a comparatively narrow gap between the rotor and the screen cage.

Abstract: A negatively pressurized rotating hollow foil pulse device having a curved leading surface, a V-shaped trailing surface and one or more openings in the trailing surface is placed in close proximity to a pulp screen for removing oversized pulp reject material. A rotating disc seal separates a reject compartment from the material to be screened.

Abstract: A paper fiber treatment system utilizes a screw revolving in a perforated cylinder as a tailings screen in place of conventional vibratory or other screens to separate undefibered fibrous materials or other undesirable solids from the free fibers. The tailings screen may be used, for example, in an otherwise conventional fiber treatment system to screen paper stock, downstream from a pulper for pulping waste paper or refuse containing a high percentage of paper fibers, or downstream of a digester for separating knots or other undefibered wood particles from the cooked fibers ejected from the digester.

Abstract: A fibre-containing liquid is sprayed on the inlet side of a first strainer, there being a flow path for medium passing therethrough and leading from the outlet side of the strainer. A second strainer spaced from the first strainer covers said flow path and has mesh openings larger than those of the first strainer but small enough so that fibres passing through the first strainer, due to rupture thereof, will rapidly obstruct the second strainer.

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.