Abstract: A filter assembly comprising a tubular member, one or more support members disposed on the tubular member, and a wire disposed on the support members. One or more spaces are formed between adjacent portions of the wire. The wire includes a wire shape having substantially flat side surfaces such that an elongated channel is formed between adjacent wire shapes.

Abstract: Grading machines include machines for sorting and/or separation of solid granular or particulate materials according to the physical parameters of the component particles. Some grading machines employ a grading cylinder for retaining the material, the grading cylinder being driven by the machine to rotate about its axis. Disclosed herein are devices for easy insertion, removal, or replacement of grading cylinders from such grading machines. Also disclosed are methods for cylinder removal from a grading machine, e.g. for maintenance or cylinder replacement. The devices and methods disclosed permit stacking of grading machines in a factory or industrial setting.

Abstract: A tensioning apparatus for tensioning a screen in a vibrating screen separator of the type having a box structure defined by two opposing spaced-apart upright side walls separated by at least one screen bed support structure. Included is an actuator support mounted to an exterior surface of a side wall of a box structure for pivotally securing the stationary end of an actuator thereto. The actuator includes a movable end that is cyclically movable from a first releasing position adjacent the sidewall, to a second engaging position, transversely spaced apart from the side wall, responsive to a track follower moving along a track inclined transversely to the side wall of the box. A clamp rail assembly is fixed to the movable end of the actuator to engage and tension a screen responsive to transverse movement of the movable end of the actuator.

Abstract: A method is provided for manufacturing a screen cylinder, as well as a screen cylinder with screen wires in the axial direction of the screen cylinder set at predefined intervals into a cylindrical screen surface and fastened to support rods, with end rings are arranged at the ends of the screen cylinder. At least one end ring is mounted at one end of the screen cylinder in such a manner that the end ring is arranged to at least one support rod at the ends of the screen wires or closest to the ends of the screen wires without fastening the end ring to the screen wires. When installing the end ring, a shrink fit is formed between the end ring and support rod, wherein the end ring is arranged to press the support rod substantially perpendicular to the axis of the screen cylinder.

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 self-cleaning screen assembly for a vibratory separator is disclosed. The self-cleaning screen assembly includes a peripheral frame having a top mounting surface to which at least one screen cloth is affixed and a bottom mounting surface to which a flow through support screen is affixed. One or more cleaning elements are freely located between the support screen and the screen cloth. The peripheral frame includes a rigid support section, a cushioned top strain relief zone, and a cushioned bottom strain relief zone. The top strain relief zone, the bottom strain relief zone and the rigid support section may be discrete components wherein the strain relief zones are formed by strain relief pads that are located adjacent to a rigid support member. The top strain relief zone provides cushioned support to the screen cloth around the edge of the screen frame adjacent to the opening. The bottom strain relief zone provides cushioning for the support screen.

Abstract: Interconnectible screen assemblies for vibratory separators or shale shakers and methods for manipulating such screen assemblies which, in certain aspects, include a first screen assembly and a second screen assembly positioning at least a portion of the first screen assembly with respect to screen assembly holding apparatus, connecting a second screen assembly to the first screen assembly, and moving the first screen assembly and the second screen assembly together with respect to the screen assembly holding apparatus.

Abstract: A tubular screen for screening of pulp suspensions comprises a mantle wall (1), which is provided with screen passages, and external support rings (6), which reinforce the mantle wall so that the latter is resistant to and is not deformed by dynamic forces during operation. Each support ring is designed with a conical surface (7), which abuts and presses directly or indirectly against the mantle wall (1).

Abstract: A screen is described wherein one end of the screen frame is provided with an upwardly open channel profile and the other end with a similar but downwardly open channel profile, such that the outboard edge of an upwardly open profile will fit within the channel of a downwardly open profile provided along the edge of an adjoining screen frame, to enable two such screens to be connected together and to enable linear movement in a direction generally perpendicular to the line of engagement and generally in the plane of at least one of the two screens, to be transmitted from one screen frame to the other. The engagement of one profile by another also serves to close the gap between the two screen frames and prevent at least particulate material from passing therebetween. Preferably the engagement prevents liquid from passing therebetween.

Abstract: In a cylindrical screen, a screen body has a height greater than its diameter, and is formed of a plurality of portions spaced apart from each other in a direction of the height. Each portion has slits laterally and vertically spaced apart from each other. At least one annular member is situated between two of the plurality of the portions of the screen body to be located radially inside an outer surface of the screen. The annular member has an annular concave formed in a middle thereof extending toward an inner side of the screen from the outer surface of the screen, and a width extending in the direction of the height. The width is greater than a distance of the slits vertically spaced apart from each other. Accordingly, a mat formed on the screen can be easily peeled off.

Abstract: A screen includes a backing grid, a plurality of parallel elongated supporting bars, and a plurality of parallel elongated screen bars. The backing grid has a plurality of parallel longitudinal grid parts and a plurality of parallel transverse grid parts connected to the longitudinal grid parts. Each of the supporting bars has a length corresponding to that of a respective one of the transverse grid parts, an outer surface fixed to the respective one of the transverse grid parts, and an inner surface formed with a plurality of parallel and spaced apart grooves. Each of the screen bars is formed integrally with a longitudinal constricted portion mounted on the supporting bars in the grooves, and a longitudinal head portion on one end of the longitudinal constricted portion. Adjacent ones of the screen bars form a longitudinal slot therebetween.

Abstract: A screen, such as a drum screen or a flat screen, for screening or fractionizing pulp suspensions or the like suspensions of the pulp and paper industry. The screen comprises a reinforcement attached to the surface of the screen plate, such as a reinforcing ring (16, 18) attached to the surface of a drum screen (10). The reinforcement (17) is made of fiber-reinforced composite material. The invention also relates to a method of manufacturing the reinforcement of a screen plate of composite material. The composite material is preferably made of reinforcing fiber and plastic matrix material.

Abstract: A screen system employs a resiliently mounted housing, a vibration generator mounted to the housing, a mounting frame fixed to the resiliently mounted housing and a support surface. This system receives a screen including a screen frame and pre-tensioned screen cloth. The frame includes an inwardly extending mounting flange accessible from below the screen when placed in the housing. Clips pivotally mounted relative to the mounting frame include a first rounded lever extending upwardly to selectively engage the inwardly extending mounting flange. Second levers extend downwardly to cooperate with actuators. The actuators include inflatable bodies with contacts which, upon inflation, force the clips to engage the inwardly extending mounting flanges. This engagement retains the screen on a resiliently mounted housing and is able to further tension the screen in place.

Abstract: A screen cylinder includes a hollow cylinder body that defines an axis. The cylinder body has a plurality of supporting bars that are parallel to the axis, that are spaced apart at a radial distance from the axis, and that are angularly spaced apart from each other. Each of the supporting bars has a radial inner portion proximate to the axis, and a radial outer portion opposite to the radial inner portion. Each of the supporting bars is formed with a plurality of strip retaining notches at one of the radial inner and radial outer portions. The strip retaining notches of the supporting bars are aligned along a helical path that surrounds the axis. The cylinder body further includes a helical screen strip mounted in the strip retaining notches of the supporting bars and extending along the helical path.

Abstract: In a pressure screening device for separating undesired particles from a fibre suspension a cylindrical screen (2) is provided. The screen has an outer side and an inner side and is provided with a plurality of projections (19) on the outer side of the screen (2) which extend in the circumferential direction of the screen (2), grooves (17) formed on the inner side of the screen (2) and extending in a direction having an axial component, and screening passages in the form of slots (18) disposed in the area of each groove (17) and diverging from the inner side of the screen (2) towards its outer side. According to the invention, the projections (19), grooves (17) and slots (18) of the screen (2) are produced by working of a substantially planar screen plate bent into cylindrical shape subsequent to the working. Thereby it is possible to form a screen (2) having uniform slots (18), the width of which at the inner side of the screen (2) is only about 0.1 mm.

Abstract: An aerator pad assembly having an aeration pad with a number of cutouts forming a shaped perimeter, is provided. The aeration pad may include a number of supports providing which provide air flow paths between the aeration pad and an associated aeration panel. A gasket may be disposed about the shaped perimeter, the gasket having a plurality of protuberances with fastener openings included, and the protuberances preferably cooperate with the cutouts to form a generally continuous interface between them. In one embodiment, a notched opening within the gasket is provided at the generally continuous interface with the shaped perimeter at least partially occupying a portion of the notched opening. In a particular embodiment, the gasket may be molded onto the aeration pad. In another embodiment, an adhesive material may be provided to form the attachment. In yet another embodiment, stitches of thread may attach the gasket and the aeration pad.

Abstract: A mounting structure for a screen frame and/or a top cover to a vibratory frame of a screening machine requires only an initial one time adjustment and includes a pair of elastomeric restraints each including a compressible bumpers on a head-end of the screen frame or top cover and a pair of compressible rollers on a foot-end of the screen frame or top cover. The screening machine mounting structure accounts for the manufacturing tolerances between the screen frame or top cover and the vibratory box frame to provide a snug fit. The rollers allow for easy screen frame or top cover installation and removal and prevent metal-to-metal contact between the respective components which generates wear and noise during operation. Further, the mounting structure according to this invention can be retrofittable into existing screening machines as well as being original equipment and is useful for securing other components of the screening machine in addition to the screen frame and top cover.

Abstract: A paper-making screen apparatus for separating foreign matters from paper-making raw materials is formed of a screen having a first annular end plate located at an end; a second annular end plate located at the other end thereof, having a plurality of openings for male screws; a plurality of interval keeping members secured to the first and second end plates to keep an interval therebetween, and having female screws on the side facing the second end plate; a plurality of male screws engaging the female screws; and a plurality of rod-shaped members connected to the first and second end plates, and annularly arranged parallel to each other at certain intervals.

Abstract: Process for manufacturing a sifting device (or strainer baskets) for use in, e.g., in the paper industry for sorting and/or filtering fiber pulp suspensions. Sorter slits may be created between a plurality of substantially parallel rods inserted into respective insets formed in a support element. The rods may be securely held in place by first inserting the rods into the insets and then by permanently bonding the placement of the rods in the support elements with a bonding agent, e.g., as hard-soldering or brazing.

Abstract: A screen cylinder, screen, method of manufacture of the screen cylinder, and method of use of the screen cylinder, allow screen capacity to be maximized without sacrificing screen cylinder strength, and while achieving a clean accepts flow. A screen cylinder is constructed in a conventional manner except that at least one reinforcing ring is permanently fastened (typically by continuous or spot laser or electric beam welding, or direct resistance welding) to at least a majority of (and typically essentially all of) the land areas which separate grooves in a row from each other, at the outlet surface of the cylinder, or at least one spiral ring is applied. In this way effective slot length of screen cylinders may be about 65-90% of the total screen length, compared to only about 45-55% for conventional screen cylinders. The screen cylinders are particularly effective in screening cellulose pulps from the pulp and paper industry.

Abstract: A support structure for thin screenplates utilized for fine screens in Fibresaving applications for pulp fiber suspensions or the like wherein a support structure having a screen support in minimum screen contact positioned by a support reinforcement and positioning device, assembled to form an integral structure which reduces the stresses and deflections in the thin screenplates occurring in operation.

Abstract: A papermaking screen of the invention is formed of first and second annular supporting members having a plurality of first and second recesses, and space holding members fixed to the first and second annular supporting members to establish a predetermined distance therebetween. In the invention, one or more elongated member groups having a plurality of elongated members are disposed between the first and second annular supporting members. The elongated members are disposed in the recesses and arranged parallel to each other to form a space between two elongated members situated adjacent to each other. Also, one or more intermediate supporting members may be situated between the first and second annular supporting members. The elongated member group may be situated between the first and second annular supporting members, between the intermediate supporting members, and between the intermediate supporting member and the first or second annular supporting member.

Abstract: A plurality of like wedge bars are formed with a groove between two lands. The wedge bars are assembled into a cylindrical screen, with the grooves defining screening slots of a uniform width. The wedge bars may be electron beam welded or furnace brazed to support rings. Alternatively, the wedge bars may be held in place by slots in support rings and circumferential clamping applied by jack wedge assemblies. Multiple cylindrical segments may be connected together into a single screen cylinder by an ear and slot arrangement. The screen cylinder so formed may have slots of 0.004 inches or less in width, and may be formed of a wide range of wear and corrosion resistant materials.

Abstract: A cage type cyclone fine screen device having an overflow pipe (2), a feeding section (3), an undersized section (6), a conical section (7), a cage type screen (5) and an integrated cylindrical section (4). The cage screen is fixed by installing the upper and lower flanges respectively onto the upper end opening of the integrated cylindrical section and the upper end opening of the inner ring of the undersized section, resulting in convenience for assembly and disassembly. The device has the advantages of high processing capability, high classification efficiency, compactness, low investment, low power consumption, and long lifetime of the screen. This device is suitable for grading and concentrating aluminum hydroxide and other fine particles.

Abstract: A garden sieve for a wheelbarrow has a collar frame adapted to conform to and fit loosely on the rim of a wheelbarrow. A sieve frame connected to the collar frame supports a wire screen adapted for sifting granular material. A motor can be connected between the wheelbarrow and the sieve to reciprocate the wire screen. The frame can include a partially removable gate for the removal of strained material and can include roller bearings to reduce friction between the sieve and the wheelbarrow.

Abstract: A paper making screen plate 1 includes first and second support members 31, 32, a plurality of longitudinal members 33 each having an end fixed to the first support member 31 and the other end fixed to the second support member 32, respectively and annularly disposed parallel with each other with gaps t defined therebetween, an intermediate support member 35 interposed between the first support member 31 and the second support member 32, having openings 36 for causing the longitudinal members 33 to pass therethrough and supporting the longitudinal members 33 by being abutted thereagainst, a first interval keeping member 381 having an end abutted against the first support member 31 and the other end abutted against the intermediate support member 35, respectively, and a second interval keeping member 391 having an end abutted against the intermediate support member 35 and the other end abutted against the second support member 32, respectively.

Abstract: A screening system having a resiliently mounted housing with a screen extending thereacross. The housing is vibrated by a low frequency vibratory drive using eccentric weights. About the peripheral frame of the screen, a high frequency drive or drives is employed to vibrate the screen in the range of 20,000 Hz. The high frequency vibration is generated at the peripheral frame about the screen. The screen may be responsive to the high frequency vibrations in a plate-like manner or as a membrane. With the high frequency drives mounted within the housing, a structure made of a sheet extends from a mounting flange inwardly to a mounting ring supporting the screen and the high frequency drives and inwardly to a collecting system including a trough and a central dome. The center of the dome may be fixed to the screen and include a high frequency drive.

Abstract: A method of making a screen cylinder, in which method mesh wires (2) are arranged next to one another and attached inside the ring-shaped supporting rods (3) to provide a cylindrical mesh surface, and a screen cylinder which includes mesh wires (2) arranged next to one another to provide a cylindrical mesh surface, the mesh wires being attached to the supporting rods (3) surrounding them. In the method, supporting rings (4) are positioned around the supporting rods (3) without fastening the supporting ring (4) to the supporting rod (3), and the supporting ring (4), when it is put in place, is tightened such that it presses the supporting ring (3) in the radial direction of the mesh cylinder. The mesh cylinder is made of a supporting ring (4) which is positioned around the supporting rod (3) without fastening it to the supporting rod (3) and which is tightened around the supporting rod (3) so firmly that it presses the supporting rod (3) in the radial direction of the screen cylinder.

Abstract: A basket for a paper-making screen is formed of a plurality of rod-shape members with a circular cross section, a first supporting member having a plurality of first receiving portions arranged annularly in predetermined constant intervals, and a second supporting member having a plurality of second receiving portions arranged annularly in predetermined constant intervals. The first and second supporting members are located on longitudinal end portions of the rod-shape members and fixed thereto. A space between the rod-shape members includes wide entrance and exit portions, and a narrow middle portion to thereby properly select paper materials through the spaces.

Abstract: A continuous cut slotted screen basket for removing contaminants from papermaking stock is disclosed. The screen basket has a wall member with first and second sides. Blind parallel first slots are cut into and are spaced across the first side. The first slots are continuous and are separated from the second side by webs of reduced wall thickness. Mutually spaced reinforcing elements are secured to the first side. The reinforcing elements extend transversely across the first slots and are spaced from the webs of reduced wall thickness. Continuous second slots are cut through the webs. The second slots are parallel to and communicate with respective first slots.

Abstract: A centrifugal sifter having a rotatable shaft with an auger and paddles located thereon. An inlet manifold presents material to be sifted to the auger. A cylindrical screen surrounds the paddles and is in turn confined within an outlet manifold where material sifted through the screen is collected and discharged. Material not passed through the screen exits the opposite end of the screen from the auger and is directed outwardly through an outlet manifold. The cylindrical screen includes circular beads at each end. These beads are positioned over short cylindrical elements and held between mounting plates and locking plates to retain the screen at each end. One of the screen clamps is slidably mounted in the centrifugal sifter and is held in place to tension the cylindrical screen by a resilient tensioning assembly. Rods extend to the slidably mounted screen clamp. Pneumatic expansion elements using air bags or pneumatic cylinders bias the rods to tension the cylindrical screen.

Abstract: The invention provides for a screen support frame component, and for a screen support frame including such a component, in which the component comprises an elongate bar having at least one tubular element affixed thereto. The tubular element defines a socket in which securing means for securing the panel is receivable.

Abstract: A vibratory screen separator using screens with screen frames. The resiliently mounted housing has a first wall portion having an upper edge and a second wall portion above the first wall portion having a lower edge, the upper and lower edges being mutually aligned and defining a seat therebetween to receive a screen frame, each mount being coupled to the first and second wall portions and having a first position with the upper and lower edges gripping the screen frame and second position with the upper and lower edges mutually displaced from the first portion and the screen frame released.

Abstract: My invention concerns the design and realization, for vibrating or shaking screening machines, of a screen fitting and automatic tensioning of suspended and pivoting type system. The aim of my invention is to reduce the necessary fatigue and time occasioned for changing screen mats, cloths or others in vibrating or shaking machines, to carry out the said changings without or with the least possible intervention inside of such machines. Also to obtain a system in which the tension bars, serving to receive the screen mats, cloths or other tension hooks, as well as to apply a tension over the said screen mats, cloths or others, such tension bars are maintained in a suspended, pivoting and definite position to allow for one the simple sliding of the screen mats, cloths or others into the vibrating or shaking machine, and finally to tension them from the outside of the said machine.

Abstract: An improved rotary screen for high volume water screening includes a rectangular truss having a forward bearing surface supporting a rotary screen element supported by a central rotating hub and a plurality of radial beams connecting to a peripheral beam. A curved support on the truss forward surface transfers screen load during use between the peripheral beam to the truss.

Abstract: The invention concerns screen baskets featuring axially parallel screen rods with screen slots contained in between and, for support of the screen rods, rings that are coaxial with the basket axis, the rings being provided with recesses that are open toward the rim. The screen rods may have feet that are placed and fastened in the recesses. The screen rods are placed in the recesses while the rings do not have their final rounded shape. The rings are rounded so as to close the circular shape and to clamp the screen rods in place in the recesses that are constricted by the rounding.

Abstract: This invention concerns a process for making rotationally symmetric screen baskets featuring axially parallel bars with screen slots contained in between and, for support of the bars, rings that are coaxial with the basket axis, the rings being provided with recesses that are open toward the rim and the bar feet being placed and fastened in the recesses.The invention is characterized by the following features:(a) the bars are placed in the recesses while the rings do not have their final rounded shape yet;(b) next, the rings are rounded so as to close the circular shape and to clamp the bars in place in the recesses that are being constricted by the rounding.

Abstract: A paper pulp screening apparatus wherein a modular cylindrically-shaped screen plate is formed of a thin material of uniform thickness bent to form an undulating shape to increase the screening area, and the screen plate is supported by cylindrical-backing members to give the plate strength, with the plate being formed into various complex shapes. Manufacturing methods for forming the undulating shapes are disclosed.

Abstract: A screen basket comprising a plurality of rods each positioned approximately parallel to the rotational symmetrical axis of the basket, a plurality of rings for connecting the plurality of rods, wherein the plurality of rods form screen slots therebetween, and wherein the plurality of rods is fastened to the plurality of rings by either welding or soldering. Each rod has a cross-section and each of said plurality of rings has a recess in the shape of the section of the cross-section of the plurality of rods. The recess is adapted to receive the plurality of rods therein.

Abstract: A filter for filtering liquids is proposed, in which the filter fabric along an arcuate path is mounted on a bearing element concomitantly rotating with the filter fabric. The bearing element is constituted by a rotatably mounted ring, which is mounted on a bearing inner ring connected to a wall of the filter. The seal between the bearing inner ring and the rotatably mounted ring is provided by an O-ring, which forms a radial or axial seal. In the case of the present filter, the inlet port is located in the rigid wall and its position and shape can be adapted to the particular requirements.

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 paper pulp screening apparatus wherein a modular cylindrically-shaped screen plate is formed of a thin material of uniform thickness bent to form an undulating shape to increase the screening area, and the screen plate is supported by cylindrical-backing members to give the plate strength, with the plate being formed into various complex shapes. Manufacturing methods for forming the undulating shapes are disclosed.

Abstract: Cyclone separator having a separating chamber with first, second and third contiguous cylindrical portions arranged in that order and of progressively decreasing diameter, tangential feed inlets to the first cylindrical portion and two outlets each arranged axially and one extending from the first cylindrical portion and the other from the third cylindrical portion. The cyclone separator has a fourth cylindrical portion leading from the outlet from the third cylindrical portion and arranged to provide a constriction against flow therethrough. The outlet from the first cylindrical portion has a flow blockage clearing means operable, under the condition of blockage of that outlet by debris to open up the area available for outflow to facilitate clearance of the blockage.

Abstract: A centrifugal screening device comprises a cylindrical screen surrounded by a cylindrical casing spaced radially from the screen. A central shaft inside the screen carries a plurality of blades which are inclined so that material fed into one end of the space between the shaft and screen is thrown toward the screen by centrifugal force and is also propelled axially of the screen to an exit at the other end. Fine material passing through the screen is collected in a funnel at the lower end. The screen is made up of semicylindrical sections each comprising a frame in which metal mesh is secured by strips of woven synthetic resin material.