Abstract: In prior pressure washer drums, the filter deck was supported on the central shaft by spokes welded to the central hub which was in turn welded to the shaft. The extreme forces caused premature failure of the welded joints. The present invention provides a pressure washer drum in which sandwiched parallel plates having an array of apertures replace the spokes and central pipe and journals are supported on the hub by a bolting system rather than by welding.

Abstract: A method and apparatus for improving the operation of a vacuum drum filter. A hollow and perforated shower roll is located at the top of a vacuum drum apparatus for drying and cleaning paper pulp. The interior of the shower roll is provided with a liquid distribution pipe having a plurality of spaced openings therealong, the pipe also having a substantially vertically extending dam which extends radially to adjacent the lower interior surface of the shower roll. In operation, rotation of the vacuum drum in a vat of paper pulp to be dewatered results in the continuous formation of layer of pulp on its exterior surface, the layer being compressed by the shower roll at the nip between the vacuum roll and the shower roll. Concurrently, the shower roll discharges or exudes water onto and into the pulp layer at the nip.

Abstract: An aquaculture system is provided for filtering water and includes a filter rotatably carried in a container for receiving water to be filtered. The filter includes a porous resilient filter screen forming an outer layer of the filter for removing particulate from water passing through the filter screen. A vacuum cleaning device is positioned in direct contact with the resilient filter screen for removing particulate collected at the outer surface of the resilient filter screen. A water nozzle supplies a stream of water to the resilient filter screen to remove particulate therefrom not previously removed by the vacuum cleaning device. A rotation device is coupled to the filter to rotate the filter in the container.

Abstract: A backwashable fluid filter formed with a filter element which is disposed so that it can be rotated about its axis inside the filter housing by a drive mechanism and through which a radial flow passes. A backwashing device is provided which includes a dirt removal channel which extends parallel to the axis of the filter element. When the filter element is backwashed, clean fluid flows back through the filter element, removes dirt particles adhering to the filter element and carries them into the dirt removal channel. In order to pre-clean the filter element, a resiliently mounted stripping device is arranged in front of the backwashing device to remove coarse dirt from the surface of the filter element before it reaches the backwashing device. The filter element is provided with slit-like openings, each of which has a substantially U-shaped configuration and defines a resilient tongue.

Abstract: Disclosed is an apparatus for refining waste water. The apparatus includes a housing having an inlet for receiving the waste water and an outlet for delivery of refined water; a cylindrical drum member rotatably mounted in the housing, the drum member having a radial thickness t between inside and outside surfaces thereof, a multiplicity of circularly cylindrical passages being formed in the drum member, the passages having a passage diameter d of approximately 0.75 inch, at least a portion of each passage terminating with the outside surface at a corner radius r of not more than approximately 0.002 inch; a vent for admitting air into the housing; and a drive for rotating the drum to a peripheral speed of at least 1000 feet per second, whereby molecules of the waste water are physically separated from the contaminants for forming the refined water, the refined water flowing from the outlet.

Abstract: A filter unit of an automatic screw machine employs a filter element that rotates relative to, and in contact with, a brush element. Foreign matter is thereby automatically dislodged and ejected from the filter element.

Abstract: A filter apparatus for synthetic plastics material melts containing impurities comprises a housing (1) in which a cylindrical or conical filter element (3) is bearingly supported for rotation around its longitudinal axis (4) by a drive means (8). The outer periphery (15) of the filter element (3) is engaged by a scraper element (20) which surrounds the filter element (3) along a helix line or a spiral line. The material to be filtered is supplied from the outside through an inlet opening (12) to the filter element (3). The filtered material penetrates openings (18) of the filter element (3) and flows into a central hollow space (17) thereof wherefrom it is carried off through a discharge opening (18). The impurities cannot pass the opening (16), gather on the outer periphery (15) of the filter element (3) and are carried by the stillstanding scraper element (20) towards an exit (24). Thereby a reliable construction is achieved which requires less effort (FIG. 1).

Abstract: In an apparatus for separating particulate material from a particle-containing liquid, at least the section of the cylindrical housing (10) provided with perforations (5) is designed as a driveable drum sieve (2') so that the solid materials are optimally separated from the liquid phase and are at the same time freed from particulate impurities.

Abstract: A screen dram for the dewatering and/or washing of cellulose pulp, comprises a first cylinder (2) made from non-stainless material, which is rotatable about its axis (5); a cylindrical screen plate (6) arranged coaxially on the outside of the first cylinder, but at a distance from it, and between the screen plate and the first cylinder an annular chamber (7) which can receive liquid which has passed through the screen plate, which chamber contains passages (26) which extend in the axial direction towards one or both ends of the drum for the withdrawal of the screen liquid. The chamber (7) is lined with stainless steel (8) in the form of one or more cylindrical plate sections (8a, 8b . . . 8n). These, by virtue of shrink joints, can be joined to and bear in seal-tight arrangement against the cylindrical casing of the first cylinder. Preferably, the stainless steel contains at least 5% molybdenum.

Abstract: A rotating drum filter assembly for thickening lime sludge includes a liquid jet distributor for directing liquid jets against a strip of lime sludge filter cake on the ascending side of the drum. The distributor is positioned on the ascending side of the drum and within 45.degree. of a vertical plane tangential to the drum peripheral surface. The liquid jets are directed so as to disperse the strip in a manner such that substantially all of the lime sludge comprising the strip remains on the drum. Cake wash water formed by water distributed from shower heads immediately refills the cleaned strip thereby minimizing loss of vacuum within the hollow drum interior.

Abstract: An anti rewet deck is provided for press rolls used to increase consistency of fibrous pulp slurry from approximately 4 percent up to about 30 to 50 percent. This is accomplished by biasing the location of the drainage holes in the roll shell to the forward edge of the drainage compartments within the roll shell. To avoid the necessity for handing of the rolls, a mechanism is provided for accomplishing the purposes of minimizing rewet at practical production rates by providing baffle plates which effectively orient the draining pattern in the desired direction. Such baffles can be permanently or removably installed once the desired handing of the rolls is determined.

Abstract: An assembly for recovering crystals from a slurry comprises a filtration unit including a rotatably mounted cylindrical filter, a slurry input for receiving slurry pressurized by a pump. The filtration unit has an outlet for discharging crystalline material separated from the slurry by the filtration unit. A first hopper connected to the filtration unit at the discharge outlet thereof is provided at a downstream side with a first valve unit which is in turn connected to a second hopper on a downstream side. A second valve unit is coupled to the second hopper at a downstream side thereof. Each of the valve units includes a rotatably mounted dome shaped valve member. The second hopper is provided with a vent extending to a gas storage tank. A conduit links the hoppers to one another for substantially equalizing pressure in the hoppers prior to an opening of the upstream valve during a discharge procedure.

Abstract: A method for filtering and backwashing solid particles out of liquids is illustrated, with a filter drum (5) positioned completely below the liquid level (6) having a cylindrical surface (7) coated with a filter medium (8), the liquid flown through the outside of the filter drum to the inside. A backwashing device for removal of the filter cake from the filter medium is provided. At the beginning of each cycle of backwashing an air cushion (15) is introduced in the filter drum (5) and liquid in the filter drum (5) is displaced in such a manner so that liquid jets from an ejetion apparatus (19) containing a spraying head (17) and being arranged in the interior of the filter drum without being sealed on the filter drum penetrate through the air cushion (15) to the backside of the cylindrical surface (7) of the filter drum (5). The filter cake so removed from the filter drum is withrawn at the outside of filter drum (5) in a stream of liquid.

Abstract: An apparatus which performs solids particles separation from a liquids/solids slurry, and subsequent drying of such solids particles, within a single enclosure. Further processing functions, such as reslurry washing, plug washing, crystal growth and other reactions, can also be carried out within that single enclosure.

Abstract: A device for removing oil and oily substances from a liquid, in particular water, has at least one open-ended tube that can be at least partially submerged into the oil-contaminated liquid to receive the liquid and that rotates around its longitudinal axis. The surface of the wall of the tube is treated so that it is particularly effective in retaining oil and oily substances. In addition, at least one scraping element that lies against the wall of the tube scrapes oil and oily substances away from the wall of the tube and transmits them to a collecting reservoir.

Abstract: A continuous filtration device comprising a cylindrical filter rotationally driven around the axis thereof, a filtration tank in which an outer chamber having an inlet for a liquid to be cleaned and an inner chamber having an exit for a liquid filtrate are separated by the filter, a cleaning means disposed in the outer chamber for spraying a cleaning liquid at high pressure at an acute angle to a surface of a filter to be cleaned, and a guide plate disposed at a position on the side opposite to the cleaning means with respect to the surface to be cleaned for guiding obstacles removed by cleaning and detaching them from the filter. The filter can be automatically cleaned by spraying a liquid to be filtered, liquid filtrate or similar other liquid to the surface of the contaminated filter. The device is useful, for example, for filtration of marine fuel oils or lubricants.

Abstract: A fluid classifier for separating particles from a lading for operation with a lading tank including a filter unit for mounting in the tank and having capillary passages for fluid flow from the tank externally of the filter unit to the interior of the filter unit for providing a pressure differential across the capillary passages resulting from a difference in fluid level in the tank and within the filter unit, a drive for rotating the filter unit in the tank, and a pump for pumping fluid from filter unit interior to the outlet. Ultrasonic transducers positioned along the filter unit for agitating the lading adjacent the capillary passages. A method of controlling fluid flow through the capillary passages.

Abstract: A band screen (1) for installation across a channel (2) containing a flowing liquid (6) comprising an endless belt of screening panels (19), each provided with inwardly extending leading and trailing edge walls (26) and so attached to the belt as to be pivotable relative thereto. Cam plates (28) on the sides of the panels (19) slide along inner and outer guide tracks to control the panel orientations around the belt, causing the leading edge walls (26) to form upwardly facing steps on the upgoing side on the screen and to subsequently flatten to facilitate screening.

Abstract: A method and apparatus for removing solids from the porous surface of a rotating vacuum drum. Such drums are used to separate the solid and liquid phases of a slurry, such as a calcium carbonate containing mud slurry. Doctor blades are often used to scrape the drum exterior surface of excess mud to minimize the build up of solids thereon. Nonetheless a cake eventually forms on the drum and clogs the porous surface and stops the vacuum action. The drum is stopped and the drum backwashed by water to dislodge the cake. According to this invention, a jet of water from a nozzle is substantially tangentially directed against the drum surface to thereby eliminate stopping the drum for cake dislodgement. The nozzle is located beneath and moves with a reciprocating secondary doctor blade, the secondary doctor blade being of a length less than the width of the drum. A stationary, main doctor blade spans the entire width of the drum.

Abstract: A filter apparatus for filtering machine tool coolant is disclosed as including a drum filter or a disc filter assembly including a hollow rotatable mandrel mounting a drum filter assembly or plurality of removable hollow disc filter elements each element having a foraminous non-reticulated metal screen having minute openings and a smooth planar surface for providing improved scrape cleanability and preventing movement of machining chips, particulate and also elongate contaminants from one side of the filter to the other side thereof.

Abstract: Apparatus and method for thickening a suspension of solid particles in liquid employs three rolls ranged in spaced relation with their axes defining a triangle, and a single loop of wire is trained around and in wrapping relation with all three rolls. With one exception, each of the rolls has in combination therewith a headbox which delivers a flow of the suspension to be thickened in such manner that it is trapped between the wire and the portion of the roll wrapped by the wire so that the trapped suspension is dewatered and concentrated by expression of liquid through the wire. The pulp deposited on the inside of the wire at each of the stations comprising a roll and headbox is ultimately collected from the surface of the one roll having no headbox and is transported out from within the space within the wire loop.

Abstract: Embodiments of apparatus for thickening a liquid suspension of solid particles, such as papermaking pulp in water, include a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied to the apparatus at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing through the first roll openings, from either a headbox in the on-running wedge zone or a headbox internal to the rolls to deliver stock outwardly through the roll.

Abstract: This invention is directed to an apparatus and method for wetting and dissolving finely divided dry particles, including hygroscopic particles such as coffee fines, in a liquid, including viscous liquids such as concentrated coffee liquor, in a manner in which foaming, the presence of wet lumps and liquor degradation are minimized. The apparatus includes a dissolving tank containing at least one pair of counter-rotating drums partially submerged in a body of the dissolving liquid. The tank includes a liquid inlet and a discharge conduit which maintain a predetermined level of liquid in the tank. A powder feeding device mounted above the tank discharges a falling curtain of particles onto a thin layer of liquid on the surface of one of the drums in each counter-rotating pair.

Abstract: A self-cleaning filter includes two cleaning blades spaced from about 75.degree. to about 115.degree. about the circumference of a rotatable tubular filter screen. The tubular filter screen is rotated relative to the two cleaning blades whereby particles in the slurry being filtered having a size less than a predetermined size are forced through the tubular filter screen and particles having a size not less than the predetermined size are removed from the exterior surface of the filter screen and then removed from the filter. The self-cleaning filter is particularly suited for filtering slurries in which solid particles tend to agglomerate.

Abstract: A filter drum with a tubular filter belt is journaled for rotation on a pipe which serves to supply filtered coolant to spray nozzles located within the drum and operable to backwash the filter belt.

Abstract: The present invention relates to a screening device with a screening cartridge that consists of a cartridge frame and a flexible web of filter material that is stretched in the frame. In order to create a screening device in which both the screening cartridges as a whole as well as the filter cloth or the webs of filter material alone can be replaced very quickly and simply, the present invention proposes that the frame incorporate a groove that runs parallel to its periphery, the web of filter material being installed in the groove and held in place by means of a cord of elastic rubber material that is installed in the groove.

Abstract: The curd ripening apparatus comprises two perforated, semicylindrical baskets (12, 30), rotatably supported on a common horizontal axis, one within the other. Curds are poured into the inside basket, and the outside basket is then rotated of 180.degree. with respect to the other and is latched with latching means (26, 28, 40) to make it integral with the other basket (12, 24) in an angular position opposite to it, so that a closed barrel is formed. One or two motors (36, 38; 136, 138) can rotate both baskets together, so that the curds are rolled until ripe. The inside basket is preferably provided with internal, parallel, transverse blades (42).

Abstract: A vacuum cleaned micro-strainer is provided. The apparatus uses a rotating cylinder-shaped set of filtering screens through which waste water flows. A vacuum head centered above the cylindrical screen assembly sucks particulate matter from the screens. The micro-strainer is constructed of inexpensive, corrosion resistant, lightweight materials which minimize replacement and maintenance. The invention offers a cost-effective means for filtration of particulate matter from water generated by fish culture systems, cooling tower systems and waste water treatment systems while minimizing the collection of water.

Abstract: A fibre suspension is separated by a filter device having a hollow filter body (1) with a wall (2) of filter material, and a container (3). The entire fibre suspension to be separated is sprayed in the form of at least one liquid jet onto said wall (2) to force a fine fraction of the suspension containing most of said undesired particles through said wall of filter material into the hollow filter body, thereby leaving a created coarse fraction of the fibre suspension mainly containing fibres in the container outside the filter body. Relative displacement between the liquid jet and the filter material is provided. Said created coarse fraction is dewatered through the wall of filter material, and said dewatered coarse fraction is discharged from the container.

Abstract: A method and apparatus for separating contaminating substances from a liquid containing contaminating substances in which the liquid is passed through a filter of resilient, porous filter material. The contaminating substances are separated from the liquid in the filter whereafter the filter is displaced to a position out of the liquid flow. In this displaced position, the filter material is compressed to squeeze out liquid retained in the filter together with separated substances retained in the filter by opposed frustoconical rollers. After the compression has ceased, the filter is moved to a position where the liquid once again passes through the filter material for renewed separation and accumulation of contaminating substances in the liquid.

Abstract: A cylinder type paper pulp washer or thickener apparatus includes a rotatable cylinder mold with a forming wire surface. The mold rotates at least partially submerged in a vat of dilute paper pulp stock and a differential pressure across the wire surface draws stock from the vat through the cylinder mold and forms a pulp mat on the wire surface, and a plurality of disrupters are positioned within the vat and in arcuately spaced relation to the wire surface to cause a disruption of the fiber mat which obstructs the flow of the stock liquid through the wire surface and thereby provides for the reestablishment of flow. Various disrupters are shown, including a rotating non-circular bar, a doctor blade, a foil, a fluid jet, a brush, and a triangular protuberance. A plurality of such disrupters are positioned in peripherally spaced relation to cause repeated disruption and reformation of a fiber mat to increase the throughflow and washing or thickening efficiency of the apparatus.

Abstract: A drum washer has improved seal performance by providing a sealing body carried by the drum of a highly corrosion resistant material. The sealing body is preferably polytetrafluoroethylene or titanium, and is connected by mechanical fasteners, instead of welding, to the surrounding drum components. The annular sealing body may have a lip at its axialmost inward portion for engaging the axial outwardmost portion of the drum inner surface, and a radially outwardly extending annular flange which cooperates with a radially inwardly extending flange of the drum outer surface. Alternatively, the body may be smooth and have through-extending openings for receiving mechanical fasteners on its axially inwardmost end, and tapped openings for receiving screw threaded fasteners connected to an extension of the drum inner surface at the axially outwardmost portion.

Abstract: A method and apparatus for fibrous suspensions in the wood processing industry and more specifically to a so-called drum cylinder, the basic construction of which comprises a vessel, into which suspension being thickened is supplied and a wire-surface cylinder rotating in the vessel. The drum filter is characterized in that the closure member of the drum filter has a channel for leading gas from the filtrate tubes through the compartments of the distribution chamber to the outside of the closing member. The method is characterized in that the operation phase of the filter cylinder is divided into five separate stages. In the first stage, when the cylinder descends on to the vessel, air and the initial filtrate are discharged from the filtrate components and the formation of the pulp web on the wire surface begins. In the second stage, filtrate is discharged with vacuum and the formation of the pulp web continues.

Abstract: Disclosed are a filter cake scraping method which can scrape a filter cake layer deposited on the surface of a filter drum with a scrape blade even if the particles of the cake are fine, and a rotary drum filter using this method. When pressure inside a suspension vessel rises above a predetermined value, a control means quickly reduces the pressure. Accordingly, precoated material or the like, which has been deposited on the filter drum, expands to push a layer of filter cake outward, thus permitting a scrape blade provided beside the filter drum to scrape the expanded cake layer.

Abstract: The local reclamation system includes an accumulation tank for a soiled solution. A tank outlet valve selectively allows a flow of the solid soiled solution into the remainder of the system. A blend conduit leads from the outlet valve. An oxidizing supply selectively provides an oxidizing agent to said soiled solution downstream of the outlet valve in the blend conduit. A blend pump receives the soiled solution with oxidizing agent to promote the flow of the soiled solution through the system and a more uniformed disposal of the oxidizing agent throughout the solution. A six stage filter section selectively removes particulate matter. A biologic stage promotes a sterile reclaimed solution and a solution accumulator accumulates and stores the solution. Repeated injections of oxidizing agents occur before filter stage sections and pumps. The reclaimed solution can be reused or discharged without penalty.

Abstract: A drum filter is provided including a rotatably mounted, generally cylindrical drum with a filter and vacuum drainage associated therewith. The deck structure comprises a plurality of circumferentially spaced, axially extending, and radially projecting imperforate members affixed at one end to the outer peripheral surface of the drum and having an outer end on which said filter is supported. The members each include a pair of circumferentially spaced, axially extending, and radially projecting imperforate surfaces. Perforate members are preferably formed in a substantially "U" shaped cross-sectional configuration comprising a pair of sidewall members connected to a floor member, which in turn is joined to and supported on the outer peripheral surface of the filter drum. The opposed surfaces of the members together define filtrate slots which form open axially extending channels adapted to receive at least a substantial portion of the filtrate after the drum rotates past the twelve o'clock position.

Abstract: A continuously operable centrifuge for spinning off sugar massecuite has an upwardly conically expanded strainer basket (20) mounted for rotation about a vertical axis (16). A downwardly conically expanding massecuite distributor (40) rotating with the basket reaches into a floor region of the strainer basket substantially coaxially to the strainer basket. The lower rim of the distributor forms a throw-off edge. Inside and in the upper region of the massecuite distributor (40), a distributing cup (30) is for distributing massecuite. The peripheral wall of the massecuite distributor (40) is formed by several ring elements (41), (42, 43) which partly overlap in the axial direction leaving an annular gap (44, 45). The product distributor is surrounded by a downwardly conically expanding stationary bell (51) which forms a further gap or gap space between itself and the rotating rings.

Abstract: A filter for continuous filtering of a suspension under pressure and/or vacuum comprises a vessel (1) having a center axle (2) on which filter discs (3) are arranged at a distance from each other along the central axle. The filter discs consist of filter sectors having surrounding filter cloth and internal channels and between the filter sectors and an outlet from the vessel (1) there is a connection in the central axle (2). Moreover, a scraper (7) is arranged for removing the filter cake (8) on the filter cloth obtained during the filtering operation and a vertical outlet pipe (12) receives the scraped-off filter cake material. The central axle (2) is formed with only one common channel for the filtrate and the gas from all filter sectors in the vessel (1) and consists of a tube.

Abstract: The invention relates to a continuous-working process and apparatus for replacing the liquid in a liquid suspension of a fibrous material with another liquid by forming of this material a bed on a moving filter surface and by displacing the liquid present in this bed with the other liquid. The bed of material is formed on a cylindrical filter surface installed in a vertical orientation below the liquid surface in a container and conveys it continuously forward filtration and several successive liquid displacements effected by maintaining a hydrostatic pressure difference across the formed bed, which is conveyed continuously horizontally forward, and through it there flow liquids horizontally during the filtration and liquid displacement.

Abstract: A filter apparatus includes a mesh filter consisting of a flexible sheet having a smooth surface and a multiplicity of through-holes and formed into a cylindrical configuration. The leading edge of a scraper is brought into abutting contact with the outer surface of the cylindrically formed mesh filter, or two scrapers can be provided on the inner and outer surfaces of the mesh filter with their leading edges abutted against these surfaces. Provided within the mesh filter is a support shaft serving also as a discharge pipe. The discharge pipe discharges clean oil filtered by the mesh filter, and the support shaft rotatably supports the mesh filter. The cylindrical mesh filter is disposed in a tank for accommodating cutting oil or abrasive oil containing solid foreign matter such as cutting chips or abrasive grains. The mesh filter is rotated on the discharge pipe/support shaft by a drive mechanism.

Abstract: Compressible material is compacted into a plug by a device including a housing, solid outer wall, and restricting adjustable portion at an outlet. A root wall is rotated about an axis and conveys the material to be compressed in a channel having solid sidewalls. Without significant extraction of liquid from the material, the material is compressed until discharged in a compacted plug form from the housing outlet. A pneumatic cylinder provides an adjustable force for effecting the compaction adjacent the housing outlet. Examples of compressible materials that may be acted upon in the practice of various industrial processes include wood chips, high consistency paper pulp (cellulose pulp), wax and fibrous waste (for making artificial fireplace logs), and mud and straw (for producing building blocks or bricks).

Abstract: A cycle of filtration is realized for liquids containing solids in suspension and a rotary filter, suited to realize and cycle, where the filtration is carried out by a rotary drum fitted with a filtering surface (2), immersed in a tank containing the liquid to be filtered (26). The phase of the separation of the filtered material deposited on the filtering surface is preceeded by a phase of removal of the material from the filtering surface carried out by using air blown from a slit and it is followed by a phase of washing of the filtering surface, carried out by a plurality of sprayers.

Abstract: An apparatus for dewatering aqueous sludge is disclosed. A porous drum is partially immersed in a sludge pond. A porous belt is connected between the drum and a roller which moves the belt. As the belt moves, the sludge adheres to the belt. A vacuum is drawn on the interior of the drum, removing some of the water. Sludge which is conveyed on the belt is frozen as it approaches the roller. The frozen sludge is broken into smaller cakes as it leaves the roller. The frozen cakes are subsequently dethawed providing a solid residue which is disposed.

Abstract: An improved conveyor system for machine tool cleaning applications comprises a sump internal to a machine tool, a recirculating system in fluid communication with the sump, a hinge belt conveyor, portions of which are interposed between the sump and the recirculating system for removing coarse solids from the fluid, and a fine filter interposed between the sump and the recirculating system for removing fine solids from the fluid.

Abstract: Rotary filter including a perforated, rotatable drum and at least one blowback valve located in close proximity to the interior surface of the drum. In a preferred embodiment, the blowback valve includes an opening adjacent the drum for the discharge of a gas and the opening includes at least one radial position adjusting device alignable with a hole in the perforated drum, whereby the radial position of the blowback valve in relation to the interior of the drum is adjustable externally through perforations in the drum. The external adjustment permits drums longer than possible with prior art rotary filters.

Abstract: A drum filter is characterized in that its filtrate compartments (20) comprise a bottom part (28,30) and a side surface (32), which is provided with a lip or curved portion (34) extending towards the inside of the compartment (20) from the edge of the side surface opposite the bottom part. The lip (34) prevents the filtrate from escaping from the compartment (20) back through the wire surface, when the drum filter (20) is rotated.

Abstract: A filter apparatus (10) for filtering machine tool coolant is disclosed as including a filter assembly (12) including a foraminous non-reticulated metal screen (30) having minute openings and a smooth planar surface for providing improved scrape cleanability and preventing movement of machining chips, particulate and also elongate contaminants from one side of the filter (12) to the other side thereof.

Abstract: A drum filter for thickening lime sludge in which the lime sludge is thickened on a filter layer (precoat) formed by the lime sludge on the filter periphery. The filter is provided with high pressure liquid nozzles continuously reciprocating in the longitudinal direction of the drum in such a way that, during each rotation of the drum, part of the filtering layer is continuously detached and drops into a vat containing the lime sludge.

Abstract: A method and apparatus for doctoring (cutting) the solids off a precoat filter. A stationary doctor blade continuously doctors mud (from a mud bath) from the surface of a rotating porous surface vacuum drum. A traveling doctor blade, located upstream of the stationary doctor blade, moves back and forth along the drum. The stationary blade extends the width of the rotating vacuum drum while the traveling blade is shorter and is also located nearer to the drum surface.

Abstract: A liquid filter comprises a cloth filter media in the form of a drum. Contaminated liquid flows into the interior of the drum thence radially outwardly through the cloth filter media as the filter rotates. Sludge is constantly backwashed from the filter media by pressurized liquid in the reverse direction of filtration. Flexibility of the cloth filter media materially enhances backwashing efficiency. Sludge is collected by a collector internally of the drum.