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 fine filter assembly for a dishwasher includes a filter body having an inlet and an outlet located substantially adjacent to one another, and an extended flow path joins the inlet and the outlet so that essentially an entire length of the filter body is used for filtration. The flow path is sloped from the inlet to the outlet and extends substantially 360 radial degrees around a circular outer perimeter of the filter body. Therefore, wash fluid naturally flows from the fine filter inlet to the fine filter outlet all the way around the filter body, and substantially the entire filter body is flushed when the fine filter is drained and a main pump assembly is energized.

Abstract: A self-cleaning fuel oil strainer, coupled to a continuous fuel flow, that includes a pair of canisters, each having a cylindrical wedge wire fuel oil filter screen. An elongated brush running the length of the screen is disposed between two confining walls also running the length of the screen to form a chamber. A elongated partition, including two sets of apertures, is used, along with the elongated brush, to divide the chamber into two particulate dislodge chambers and a drain subchamber. A drain is in fluid communication with the drain subchamber. During cleaning, the drain is opened and the screen is rotated against the brush for liberating the particulate contaminants and a limited amount of fuel oil into the two dislodge subchambers. The particulate contaminants and the limited amount of fuel oil then pass through the apertures at a high velocity and into the drain subchamber which exits through the drain.

Abstract: A fine filter assembly for a dishwasher includes a filter body having a soil accumulation trough. The soil accumulation trough defines a substantially helical flow path between a fine filter inlet and an outlet. A natural flow path is therefore provided to efficiently clean fine the filter assembly with downwardly directed fluid jets generated by a lower spray arm assembly. Soil is directed to a fine filter drain tube with relative ease, thereby facilitating use of more efficient use of a drain pump inlet as a soil collection chamber during wash cycles.

Abstract: In a particle or sand screen control assembly for mounting on a base pipe used in a well, a sealing strip preferably in the form of a metal strip is used in a weld joint that joins the metal mesh screen of filter media to a solid metal structure or “safe edge”. The sealing strip covers the pores in the screen proximate the metal structure to which it is welded. The sealing strip is a separate thin sheet of metal that is compatible with the welding metal used in the weld joint, such that the sealing strip becomes unitary with the weld joint. Prior to welding, the sealing strip may be bent around the screen if desired, or may lie flat along the top or bottom surface of the screen.

Abstract: A screen assembly and methods for using it, the screen assembly including, in certain aspects, at least two layers of screening material one on top of the other and including at least a first layer over a second layer, each layer having screen mesh with rectangular openings as viewed from above, the first layer having first rectangular openings, and the second layer having second rectangular openings, each of the first rectangular openings having a first width and a first length, and each of the second rectangular openings having a second width and a second length, the ratio of the first length to the first width ranging between 1.55 and 2.00, the ratio of the second length to the second width ranging between 1.55 and 2.00, the ratio of the first length to the second width ranging between 0.95 and 1.05, and the lengths of the first rectangular openings are parallel to lengths of the second rectangular openings.

Abstract: A fuel-filtering device includes a filter body in a bag form and a spacing member arranged in the filter body to maintain the bag form. The filtering device is attached to a fuel suction port located inside a fuel tank such that an inner space of the filter body communicates with the fuel suction port. The filter body is formed of at least two laminated filter layers, which includes an outside filter layer formed of a woven mesh and an inside filter layer formed of a non-woven fabric. Alternatively, the filter body includes an upper surface section and a lower surface section, and at least the lower surface section of the filter body has an inner layer formed of a mesh and an outer layer formed of a non-woven fabric.

Abstract: A fluid contaminant collection system is provided where a filter passively interacts with the fluid to remove contaminants from the fluid. The system includes a wall defining at least a portion of a chamber or passageway. Located within the chamber or passageway is the filter. The filter includes a contaminant removal portion and is located within the chamber or housing to interact with the fluid. During interaction between the fluid and the filter, the fluid passes or washes over the filter and contaminants are removed by the contaminant removal portion from the fluid.

Abstract: A device to be used as part of a new or existing rain gutter system, positioned between and joining an open-end gutter and the downspout, that utilizes the movement of flowing rain water to keep the system open and draining by floating and pushing nuisance debris to and out the low open end on to the invention. Removal of the low point end stop and repositioning the downspout connector eliminates the primary causes of pooling and build up of debris. Very steep smooth parallel bars, covering the top of a trough-shaped collector box. receive the effluence and separate the solids from the liquid, as the solids slide down and off the end while the liquids fall between the bars into the collector box for passage to the downspout connected at the bottom. The device enables the gutters to discharge at speeds and volumes consistent with collection minimizing the possibility of spillage while, at the same time, keeping the system open and flowing without the need for frequent hand cleaning.

Abstract: A toilet water-line filter (10) that is designed to protect a toilet's fill valve (62) from the intrusion of potentially damaging debris such as rocks, vegetation, etc. The filter (10) is comprised of a housing (12) and an internal filter (34) which consists of a mesh staining element (36). The filter (10) is attached between the toilet's fill valve (62) and a typical, flexible, water line (66). Debris that would normally pass into the fill valve (62) becomes trapped in the mesh staining element (36), from where the debris is easily removed.

Abstract: A disposable net assembly is provided for a trap for collecting floatable debris in a waterway or combined sewer system. The net assembly includes a knitted bag-shaped mesh net having a frame surrounding the mouth of the net with the net secured around its rim to the frame. The net may be formed of an inner layer and an outer layer of mesh with the openings of the inner layer being substantially larger than the openings of the outer layer. The frame may be formed of a plastic molded material having side members tapered in the vertical direction to facilitate the changing of the netting assemblies and tapered in the downstream direction to lock into place under the force of the flow. Several embodiments of the frame members have projections thereon which cooperate with a clamping element to hold the net to the frame. Some embodiments of the members have parts that lock together with a post and hole construction while others employ a tension band to clamp the net to the projections on the frame.

Abstract: A pulp screening assembly where each support ring is weldlessly bonded to a perforate screen section by a bonding material that preferably is a brazing material. There is a joint between each ring and a screen section in which brazing material is disposed. The joint includes at least one set of mating faying surfaces that are offset relative to a longitudinal axis of the screening assembly. In a preferred embodiment, there is a tolerance between mated faying surfaces of no greater than 0.008 inches to ensure a good weldless bond is achieved. In another preferred embodiment, the tolerance is no greater than 0.004 inches. A weldless screen basket is produced having end rings, a plurality of slotted screen sections, and an intermediate ring having slots with back grooves within four millimeters of a ring at each end increasing screening open area.

Abstract: A paint sprayer filter system includes an intake tube having a rigid paint flow control and filter support frame connected to the open end thereof. A reusable filter is connected to the frame and surrounds the frame, the reusable filter being releasably connected to the frame to provide easy removal or attachment of the reusable filter.

Abstract: A filtering device includes a container having an inlet for introducing liquid to be treated, an annular multi-layered prepacked screen assembly provided in the container and having an outlet for treated liquid. The screen assembly includes three or more cylindrical screens having different diameters and being coexially disposed in the container with their axes extending vertically in the container. An annulus is formed between the respective cylindrical screens. Two or more different filter materials performing different filtering functions are filled one in each of the annuluses between the cylindrical screens.

Abstract: A screen material having a flexible member. The screen material includes closely spaced filter wires supported by a plurality of support members. A stranded cable is used as the support members to provide flexibility to the screen material. The filter wires are welded to the members and define filter gaps between adjacent filter wires to allow liquid and small particles to pass through, while retaining particles too large to fit through the filter gaps.

Abstract: Nonwoven fabric for pleated filters comprising a sheath-core conjugate filament in which the core component is made of a polymer higher in melting point and the sheath component is made of a polymer lower in melting point, having compressively bonded portions dotted by embossing, with a weight per unit area X (g/m2) of the nonwoven fabric and a stiffness Y (mgf) obtained according to the Gurley method of JIS L 1096 of Y/X2≧0.03 and X≧120.

Abstract: A dome shaped filtering device for removal of contaminants from extrudate, consisting of a coarse mesh support screen, an intermediate mesh support screen and a fine mesh filter screen. All screens are stainless steel woven wire. A method and apparatus(s) for producing the screens is also included.

Abstract: A suction head is provided for the end of a fuel hose in a fuel tank of a portable implement. The suction head comprises a cup-shaped housing of polymeric material that is closed off by a cap. Provided on the cap is a connector for the end of the fuel hose. The outer surface of the housing is provided with window-like cutouts that are covered by a filter mesh. In order also with narrow, fragmented tank housings to ensure an immersion of the suction head into the fuel in every operating position, a rod-shaped weight member is disposed in the center of the housing. This weight member extends from the base of the housing to the cap, with a first end of the weight member being held on the base and a second end being held on the cap.

Abstract: A filtering apparatus of T-shaped configuration includes a vertically extending filter element receiving tube and a horizontally extending outlet conduit portion. A removable tubular filtering element having a flexible seal surrounding the outer surface of the filter element at a lower end is engagable with an inner surface of the filter element receiving tube. A stationary filter element is disposed at a juncture of the outlet conduit with a central opening in the vertically extending filter element receiving tube wherein the flexible seal of the filter engages with and cleans the particulates from the stationary filter element upon insertion and removal of the tubular filtering element from the filter element receiving portion.

Abstract: A fuel filter for use in a fuel filter/pump/sensor module and method of making same provides an in-tank fuel filter having a novel retaining member for securing the body of the filter in a position adjacent the housing of a fuel pump to which it is connected. The filter includes a fabric body, an in-situ molded outlet fitting on the top side of the fabric body and runners or contact points on the underside of the body. The fabric body may be a single folded fabric swatch or a plurality of swatches sealed about the open edges. The outlet fitting cooperatively engages the inlet of a fuel pump. A retaining member formed on the periphery of the body engages the housing of the fuel pump and positions the filter body adjacent the housing.

Abstract: A pulp screen cylinder that includes screen media releasably engaged with a frame at spaced locations opposing movement of the media away from the frame during screening. A preferred frame includes a plurality of spaced engaging structures that releasably engage screen media. A preferred frame includes an arrangement of flow windows that are triangular or rhomboid. A preferred method includes producing a frame cylinder by centrifugal casting and machining flow windows using a jet cutting process. A preferred screen media has a plurality of spaced apart engaging structures that each releasably engages the frame at spaced apart locations. A preferred screen media is of wedgewire construction having engaging structure carried by a plurality of spaced wire retaining clips. A preferred clip has vee-shaped rounded slots and an arm thicker than an end wall. A preferred engaging structure includes a projection that has a lip or hook for releasable interlocking engagement.

Abstract: A composite gutter guard is adapted for being positioned at an opening of a longitudinally extending, generally U-shaped gutter used for collecting and distributing rainwater runoff from the roofs of residential homes and other buildings. The gutter guard includes an elongate polymer guard panel defining a plurality of spaced filter openings. The guard panel is adapted to extend laterally across the opening of the gutter and longitudinally along the length of the gutter. A polymer-coated mesh layer overlies the guard panel in an area of the filter openings and cooperates with the guard panel to capture and separate debris from rainwater runoff entering the gutter. A heat weld connects the mesh layer to the guard panel.

Abstract: A filter element (10) is provided which can be used to remove microsize contaminant particles (i.e., about 0.5 &mgr;m to about 25.0 &mgr;m) from aviation fuel. The filter element (10) includes a cylindrical pleated filter media (14) and an exoskeleton support structure (16) supporting the filter media (14). The filter media (14) has a pleat density of about eight to about thirteen pleats per inner diameter inch and is formed only from cellulose-fiber-free and woven-mesh-free layers. The exoskeleton support structure (16) is a screen which is thermally bonded to the pleats' peaks in such a manner that the filter media (14) is sufficiently supported without conventional endoskeleton support layers.

Abstract: A device case is constructed to include a front frame, a face panel, a metal wire gauze filter mounted in an air input port in the face panel, an air output port disposed at a back side, an induced-draft fan mounted in a front frame behind the face panel and adapted to draw outside air through the air input port and the air output port, an ultraviolet lamp installed in the front frame above the induced-draft fan, and a layer of titanium dioxide photocatalyst coated on the face panel, said frame, the wire gauze filter, and an inside wall of the computer case within the radiation of ultraviolet light from the ultraviolet lamp.

Abstract: A method for separating fluid and fibrous lost circulation material from a mixture thereof that also includes drilled cuttings, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid and fibrous lost circulation material through the screen assembly and for separation of the driled cuttings from the fluid, the screen assembly with a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with a screen mesh with non-square openings as viewed from above to facilitate the passage of fibrous lost circulation material through the screen assembly.

Abstract: A method for separating fluid and fibrous lost circulation material from a mixture of fluid, drilled cuttings and fibrous lost circulation material, the method including introducing the mixture onto a screen assembly that has at least two layers of screening material and including at least a first layer over a second layer, the layers with rectangular openings, the first layer having first rectangular openings each having a first width and a first length, and the second layer having second rectangular openings each having a second width and a second length, the ratio of the first length to the first width ranging between 1.55 and 2.00, the ratio of the second length to the second width ranging between 1.55 and 2.00, the ratio of the first length to the second width ranging between 0.95 and 1.05, and the lengths of the first rectangular openings parallel to lengths of the second rectangular openings.

Abstract: A method for making a screen filter, especially for filtering liquid or gaseous materials, in which the screen filter comprises a mounting ring or mounting element (10) and a filtering screen arranged on the mounting ring or mounting element. The filtering screen is composed of a mesh web fabric (15) and can be connected to a basket-shaped support skeleton (16). The mounting ring (10) and the support skeleton (16) are injection-molded around the mesh web fabric (15).

Abstract: The invention relates to a method for separating solid particles from a liquid in a dish-washer. For the separation a filter (19) of expanded metal is provided, which forts openings (21) the bounding surfaces (22) of which are inclined in relation to the plane of the filter. The liquid with particles entrained therein is directed towards descending bounding surfaces in the filter for guiding the liquid flow through the filter under separation of the particles from the liquid.

Abstract: An expandable well screen provides increased collapse, torsional and tensile strength. In a described embodiment, an expandable well screen includes a generally tubular base pipe and an external filtering media. The well screen is configured to have sufficient torsional and tensile strength for conveyance and positioning in a wellbore, while also having sufficient strength to prevent collapse when the screen is radially expanded.

Abstract: Screens and screen assemblies for a vibratory separator or shale shaker, such screens and screen assemblies made by a method including applying glue in a glue pattern to at least one layer of screening material, said applying done by powered moving mechanical glue application apparatus; in one aspect moving with powered mechanical screen movement apparatus the at least one layer of screening material beneath the powered moving mechanical glue application apparatus; in one aspect, using hot melt moisture-curing glue, and in one aspect facilitating the cure of moisture-curing glue by applying moisture to it.

Abstract: An inlet screen for an ocean thermal power plant has an outer side parallel to the ocean current and a plurality of parallel bars extending at an acute angle to the horizontal, wherein the acute angle opens toward the upstream direction of the current. The total area of through openings in the inlet screen receive the predetermined flow requirement of the power plant at a velocity no greater than 0.5 feet per second, so that fish are not sucked against the screen. The vertical spacing between the bars is no greater than one-half of the inner diameter of tubes in heat exchangers in the plant. The spacing between bars is at a minimum at the outer side of the screen, and the spacing increases between the outer side and the inner side, so that objects do not become wedged between the bars. The inlet screen extends sufficiently below the ocean level to accommodate the plant's water flow requirement at a velocity of no greater than 0.

Abstract: A method of repairing or refurbishing a filter screen is described. The type of screen is defined in the specification. The repair or refurbishment is effected by stripping worn or damaged wirecloth from the surface of the frame and placing fresh cloth over the frame and tensioning it as appropriate. Heat is then applied so as to soften surfaces of the frame over which wirecloth is stretched, so that the latter can penetrate softened plastics material in the surfaces and become embedded therein. The frame and its associated fresh cloth is allowed to cool, after which the applied tensioning is removed. Exposed edges of the wirecloth can be trimmed back to the surrounding flange. Plastics material may be applied to the surface of the frame which is to receive the new wirecloth, before the latter is fitted, to provide additional plastics material for bonding the wirecloth to the frame.

Abstract: A filter assembly for use in a press mould for moulding of cementitious products, the filter assembly including a fabric mounted in face to face contact with a support plate, perforated with a plurality of apertures arranged in a predetermined pattern to permit passage of fluid through the plate, the apertures defining imperforate zones there between, the fabric being knitted or woven to have a surface defined by a plurality of parallel ribs in face to face contact with the support plate, each pair of adjacent ribs defining therebetween opposed sides of a fluid channel which communicates with a number of said apertures and said imperforate zones, the ribs being knitted or woven to be sufficiently non-compressible in order to resist collapse of said fluid channels during compression of the cementitious product within said mould.

Abstract: apparatus for repairing or refurbishing a filter screen (of the type defined in the specification) is described. The apparatus comprises a tray for accommodating a filter screen frame from which worn wirecloth has been stripped. Wirecloth stretching means surrounds the tray which includes attachment means for securing to edges of a sheet of wirecloth laid over an upper surface of the frame in the tray. Tensioning means is provided for exerting tension on the wirecloth in at least two mutually different directions so as to stretch it over the frame, and heating means is provided for heating the frame to soften the uppermost edges of a matrix of struts and periphery of the frame. Forcing means serves to force the wirecloth into the softened edges such that after cooling, the wirecloth remains bonded to the frame. Thereafter the wirecloth can be trimmed back to the edges of the frame.

Abstract: A method of constructing a frame (10) for a filtering screen from a polymer material is described in which a wire frame reinforcement is wholly encapsulated during the frame moulding process so that two parallel spaced apart wires extend through each of the intersecting orthogonal ribs (14, 16) which define the open area of the frame (10) across which the wire-cloths (158, 159) are stretched. The surfaces of the frame (10) in which the wirecloths (158, 159) are embedded are formed with ridges (22, 30, 32) and the crests of the latter extend to different heights. The crest are softened by heating during the manufacturing process and the wirecloths (158, 159) stretched over the frame (10) are forced into the softened crests after which the assembly is allowed to cool and cure. The frame (10) is re-usable by stripping wirecloths (158, 159) from the top of the frame (10) and fitting fresh wirecloths over the plastics material and heating the regions which are to encapsulate the fresh wirecloth.

Abstract: A separator cartridge comprises a support screen comprising a substantially rigid reinforced plastic cylinder including an inner first major surface and an outer second major surface, a first nonwoven polymer layer adhered to the inner first major surface of the support screen, a second nonwoven polymer layer adhered to the outer second major surface of the support screen, and a polymeric screen contacting and frictionally engaging the second nonwoven polymer layer, the polymeric screen including a hydrophobic coating.

Abstract: A vibratory separator with a base, vibrating apparatus, a screen container on the base, the screen container having a plurality of spaced-apart drain holes, a plurality of spaced-apart screens in the screen-container, said screens oriented vertically within the screen container, and the screens positioned so that screened fluid passes through the screens and flows from the container through the plurality of spaced-apart drain holes.

Abstract: A filter plate (10) comprises a body (12) having at least one flow path (16) for fluid to be filtered and one filter medium arrangement (14) arranged in the at least one flow path (16) and connected to the body (12). The filter medium arrangement (14) is connected to the filter plate body (12) by sintering, soldering, gluing or bonding. Further, methods of producing the filter plate and its use in a rotary filter are disclosed.

Abstract: A sieve filter (1) for fluid lines or conduits which are formed of an annular disk-like fluid inlet (3) and an annular disk-like fluid outlet (4) with a fine mesh filter element arranged there between that is braced by stiffening bars (5), and which has a bypass function when the filter element (6) is stopped up or with highly viscous fluid. The fluid inlet (3) of the sieve filter (1) is constructed with the bypass function in that it has a smaller outside diameter than the fluid outlet (4) and is sealed off by a pressure relief valve (7). When the filter element (6) is stopped up or with highly viscous fluid in the line, the fluid inlet (3) is cleared by opening the pressure relief valve (7) as a bypass, through which the fluid is conducted unfiltered to the fluid outlet (4) of the sieve filter (1).

Abstract: Micro/ultra filtering elements are provided. The filtering elements comprise a support having one or more levels and a porous filtering membrane layer formed thereon comprising sintered ceramic and/or metallic particles of uniform diameters. The membrane may also contain ceramic particles which are disposed in the pores of the membrane. The filtering membrane preferably has an average pore size of from about 0.005 to about 10 micrometers. The filter element is capable of being formed in a variety of geometrical shapes based on the shape of the porous support.

Abstract: The invention relates generally to a method of separating swarf lubricant from swarf solids. A centrifuge parts separator utilizes a screen which preferably comprises a cylindrical shaped member formed in one or more component parts with a plurality of spaced fluid passage openings therein with the ratio of the distance between the center lines of adjacent openings (x) and the median width of the openings (y) being x/y of at least 18/1. The swarf is centrifuged in the separator during the course of which operation, substantially all the swarf fluid passes through the screen openings whereas substantially all the swarf solid passes over the screen, the separated swarf fluids and solids each being directed to a collection site.

Abstract: A vortex mechanical power filter includes a filter unit 12 arranged within a vortex tank 10 such that water to be filtered, e.g. flowing from a from a fish pond via gravity supply line 22, impinges upon a side of the filter unit at an angle to cause rotation thereof. The filter unit can also include a polyurethane ring float 121 so that the filter unit is self-adjusting within the vortex tank. Within the filter unit, a vortex disrupter 20 can be provided to aid in rotation thereof. As the system operates, a water jet assembly 18 sprays a plurality of water jets onto the filter screen to gently clean waste therefrom so that filtered water can be continuously provided.

Abstract: A spiral wound filter element is disclosed which includes alternating layers of filter medium and diffusion medium wrapped about a cylindrical core defining a central axis of the filter element. The alternating layers extend from a radially innermost layer of the filter element to a radially outermost layer of the filter element, the diffusion medium is defined by a continuous lengthwise sheet of mesh material, and the filter medium is defined by at least one sheet of filter material arranged along the length of the continuous sheet of mesh material. The alternating layers of filter medium and diffusion medium define three distinct radially disposed layered filtering sections surrounding the cylindrical core, and include a first filtering section having radially outer prequalifying layers, a second filtering section having middle prequalifying layers and a third filtering section having radially inner qualifying layers.

Abstract: A vibrating screen assembly having a tubular frame. The tubular frame includes a pair of opposed tubular sides and a pair of opposed tubular ends. An upstanding lip extending from each side and extending from each end forms a rim enclosure. A ledge extends inwardly from the opposed sides. A perforated plate with a plurality of screen cloths thereon is positioned within the rim enclosure and secured to a planar surface of the frame. A slot in the tubular sides and tubular ends forms a continuous channel and an elastomeric gasket is press fit into the slot and held therein without adhesives or fasteners.

Abstract: A method for separating fluid from a mixture of fluid and fibrous lost circulation material, the method including introducing the mixture onto a screen assembly that is vibrating for passage of the fluid through the screen assembly and for separation of fibrous lost circulation material from the fluid, the screen assembly comprising a plurality of screens one on top of the other and including at least a first screen and a second screen, one of the screens with comprising a screen mesh woven with non-square openings as viewed from above.

Abstract: A portable liquid-solid separator tank has a bed, surrounding exterior walls, a dividing wall. The exterior walls of the tank include a gasket door to allow easy removal of the filtered sludge. The exterior walls of the tank support sludge include inlet valves where the sludge is provided by a hose from a storage and/or mixing tank. The exterior walls also include a liquid outlet valve or valves for the filtered liquid to be removed and roller wheels that enable the tank to be easily transported. The tank contains a filter media mounted on a filter media support structure supported by the interior of the bed, exterior walls, and the dividing wall. The filter media support structure is composed of perforated metal supports and expanded metal supports. The use of the expanded metal supports in the filter media support structure increases the opening space in the support structure and reduces the amount of time it takes to filter the sludge.

Abstract: In accordance with the present invention there is provided a dual manifold filtering system. The dual manifold filtering system of the present invention, unlike the currently available filtering systems, allows the filter elements to be cleaned from both ends of the filter elements during backwashing operations. A flow restriction device is also placed in the grid main channel of the filter elements to force more of the liquid to flow out radially from the grid main channel during backwashing. Valve and piping means are provided to enable liquid to be directed into one or the other manifold during backwashing operations.

Abstract: A filter is composed of a filter member forming at least two opposed faces, an inner space surrounded by the filter member for accumulation of a liquid, and a coupling member establishing communication between the inner space and the outside to discharge the liquid in the inner space to the outside. The liquid flows through the filter member, is thereby removed of foreign matters, and is discharged via the coupling member. Convexo-concaves are provided on at least one face of the filter member.

Abstract: A screen used in the production of cellulose pulp may be mounted in a digester to minimize traditional screen problems (including clogging) without introducing new problems. The screen comprises a screen plate having a plurality of slots formed in it with an inclination angle, which is 30-60° with respect to the bottom edge of the screen plate. The screen plate may comprise a plurality of parallel screen bars side-by-side, or an integral metal plate with slots formed in it. The slots have a width between 1-5 (e.g. 2-4) millimeters and a spacing between them of 3-9 millimeters.

Abstract: A multi-segment filter system is provided for continuous filtration of high viscosity materials, such as polymer melts. In particular, each segment comprises a filter screen positioned between a bottom breaker plate and a top cover plate. The filter screen has a fixed alignment in relation to the breaker plate and cover plate, to prevent the formation of undesirable gaps. In one example, the alignment is fixed through positioning of pins extending from the breaker plate and passing through apertures in the filter screen and cover plate. Two pins are preferably positioned on the breaker plate in a nonsymmetric manner to ensure that a multilayered filter screen is positioned adjacent the breaker plate in a desired orientation. Successive segments are positioned on end and preferably include overlapped filter screen portions, thus eliminating any gaps between each segment. Overlapping coupling connections may also be provided in adjacent breaker plates.