Abstract: A scraper filter system, which comprises a screw-formed spiral impeller within a cylindrical filter element, and scraper means formed along the spiral end of the impeller for engagement with the internal surface of the filter element for scrapingly removing solid components deposited on the surface of the filter element.Further the present invention provides a filter system, which comprises a cylindrical filter element, a cylindrical casing allowing liquid components to flow from the inside to the outside through the filter element, a spiral impeller with the scraper means for engagement with the internal surface of the filter element for removing solid components, and further comprises a feed liquid inlet at one end of the cylindrical casing and filter cake discharge means including a cake discharge outlet at the outlet end of the casing.

Abstract: A bar screen assembly includes a bar rack interposed across a passageway. At least one rake arm for raking debris from the bar rack to an upper end of the bar rack is provided. An apron adjacent the upper end of the bar rack receives debris, and the apron is mounted to the frame for movement between a receiving position and a dumping position. A mechanism is provided to sense movement of the rake arm relative the upper end of the bar rack, and a mechanism is provided for moving the apron from the receiving position to the dumping position in response to the sensing mechanism.

Abstract: An apparatus for dewatering a pulp is described, comprising a vessel having a pulp chamber for pulp to be dewatered; a pulp inlet to the vessle; pulp outlet from the vessel; a filtrate chamber with an outlet for filtrate expelled from the pulp; a stationary cylindrical screen mounted within the vessel and defining said plup chamber and filtrate chamber on opposite sides thereof; and mechanical cleaning means supported by a shaft and disposed in the pulp chamber close to the screen face of the screen for removing a mat of pulp therefrom. The apparatus further comprises a backflushing means mounted outside the vessel and including a cylinder with first and second end portions and a piston mounted within the cylinder for reciprocal movement therein. The first end portion communicates with the interior of the apparatus, and the second end portion communicates with the filtrate chamber.

Abstract: Solids contained in waste water are separated and dewatered by a separator comprising a cylindrical strainer basket and a rotary screw disposed in said basket. The screw terminates short of an outlet end of the basket. Waste water introduced into the separator is advanced by the screw until a solids slug is formed between a discharge end of the screw and a solids discharge formed by a cylindrical tube extending forwardly from the basket. About seventy to ninety-five percent of the slug is contained in the basket and is pressed laterally against a wall of the basket to promote the removal of water. The terminal portion of the screw tapers in order to maximize the compaction of the solids slug.

Abstract: Apparatus for separating contaminants from contaminant entrained flows including an inclined longitudinally extending filtering trough with a floating conveyor disposed therein, the trough having a lower inlet and upper outlet and being pivotally mounted intermediate its extremities relative a sump so that the lower portion of the trough extends into the sump with the conveyor driven at its lower extremity from a power source adjacent the pivot area and in spaced relation from the trough outlet.

Abstract: Fiber suspension, such as paper pulp flowing to the headbox of a paper machine, is acted upon by apparatus which affects the axial direction and magnitude of the speed of the fiber suspension during screening to optimize results. A rotor cooperates with a screen cylinder, the rotor having a plurality of projections arranged along its axial length. The axial length of the rotor preferably has different axially extending circumferential zones. The projections have non-axial surfaces which act on the suspension to change the axial forces. Different shapes of projections are preferably provided in the different zones so that the axial forces vary in dependence upon the distance from the inlet to the screen casing, and the discharge outlet from the screen casing.

Abstract: An apparatus for dewatering and squeezing a water containing material comprises a drum with a sieve mantle defining two co-operating drum sections, each comprising a feed screw extending therein. The first section of the drum in the feed direction is formed for dewatering of the material mainly by self-drainage. The first drum section is rotatable and is provided with means for cleaning the sieve mantle holes. The second section is formed for increased compression of the material, and has a thread height for the feed screw smaller at the outlet of the second section than at the inlet to this section.

Abstract: The present invention comprises a closed-loop filter system for continuously removing a metal hydroxide precipitate from an alkali metal hydroxide solution. The filter system comprises a filter having a filter surface and a plurality of small diameter openings in said surface. The alkali metal hydroxide solution is impacted onto said filter surface, metal hydroxide precipitate agglomerating on said surface. The filter surface openings have an average diameter effective for said agglomerating. Means are provided to remove the agglomerated precipitate from said filter surface, and to separate the agglomerated precipitate from the alkali metal hydroxide solution, the agglomerated precipitate having a particle weight to surface area ratio effective for said separation.

Abstract: The present invention relates to a filtering device with an agitator. The filtering device broadly consists of a horizontal filter plate with a central discharge opening and an agitator shaft disposed vertically and centrally to the filter plate. The agitator shaft has two agitator arms, with agitator blades being disposed on the agitator arms, pointing towards the filter plate and set at an angle to their circular path.

Abstract: The present invention relates to a method and apparatus for the continuous discharge of water from suspension, especially from fibrous pulp, whereby pulp is caused to thicken without having the water to be removed through a thick uncontrollably gathered fiber mat.In accordance with the invention the suspension to be thickened is fed into a filtering chamber, the suspension is formed as a layer that is continuously being mixed for equalizing the consistency differences, the liquid is continuously removed from the suspension and the thickness of the fiber mat being formed on the filter surface is controlled by subjecting said mat to shear stresses.The above described method is realized by an apparatus, in which at least one of the co-operating surfaces, the filtering surface (8) and its counter surface (10), is provided with means (12) for non-mechanically limiting the thickness of a fiber mat on the filtering surface, whereby a uncontrolled formation of a fiber mat on the filtering surface (8) is prevented.

Abstract: A self-cleaning filtering apparatus is provided comprising a body with an inner filtering basket communicating with an intake duct for the product to be filtered and a drain for discharging waste and forming, with the body, a peripheral space communicating with an outlet duct for the filtrate. Rotary scrapers clean the inside of the basket. The peripheral space communicates with the filtrate outlet duct through an annular restriction.

Abstract: Apparatus adapted for use in a water clarification system which removes particles of greater than a predetermined size from the clarified water includes a screen or a pair of concentric screens positioned in a clarified water storage area between an inlet and a clarified water outlet. One or more spray heads for direct a shower of high pressure filtered clarified water at the outlet side of the screen or screens to loosen or remove particles therefrom. In addition, a rotating brush can act on the inlet side of the screen. Particles removed by the cleaning elements are recirculated through the system. Water levels are maintained by overflow control or by monitoring the water level and utilizing the output from the monitor or monitors to selectively control valves in the inlet or outlets from the system.

Abstract: An elongated, imperforate housing (2) has a slurry inlet port (5) at one end and a pulp discharge port (6) at the other end. A pressing section (2b) within the housing is in direct fluid communication with the inlet port, and extracts liquid from the slurry by passing the slurry through a first compression restriction (108) to produce a pressed pulp. An annular washing section (2c) within the housing is positioned immediately downstream of, and in direct fluid communication with, the first compression restriction. The washing section has radially inner (109) and outer (14) cylindrical walls defining an annular washing chamber (110) for decompressing, diluting, and washing the pressed pulp. The washing is accomplished by injecting a washing liquid into the washing chamber through the inner wall, and simultaneously through the outer wall while the mixture is agitated. A repressing section (2d) within the housing is in direct fluid communication with the washing section, for receiving the conveyed mixture.

Abstract: In the cleansing especially of cooling water for a heat exchanger the installation of rotationally symmetric filter bodies in the cooling water feeder pipe and suction of sediments across a suction nozzle rotating on the windward side. Difficulties result therein in the production of a required back-flow through the filter and the avoidance of lateral airfluxes in front of the filter surface, as a certain gap is necessary between filter and suction nozzle for holding the sediments.

Abstract: A process filter is provided with a heatable container within a rotating drive shaft moveable in an axial direction. To the agitating mechanism shaft is fastened a paddle support with paddles. The shaft is introduced over an inward-drawn container neck into the interior of the container. The shaft is hollow, with a feed line and a return line for the flow of a heating medium. The paddle support and the paddles have interior heating channels which connect with the feed line and the return line in the hollow shaft for the passage of a heating fluid therein.

Abstract: A screen plate and method of making a screen plate for the pressure screening of papermaking stock in pressure screening apparatus includes slots which have been cut therethrough by a machining laser beam focused at the inlet side of the plate, to provide slots with nearly straight walls with minimum taper, and which are recast and have a "glassy" appearance by reason of the melting and resolidification of the immediate wall surface, to provide a low friction path for the stock. Straight, curved and inclined or slanted slots are disclosed including slots which are at a diagonal to the axis of the cylinder. Slots or openings are disclosed which are inclined to a radius line therethrough both with and against the direction of flow of the stock along the inlet surface. Wear bars are applied to the plate for coaction with the rotating foils on the screening apparatus, in the form of strips of weld material of high hardness applied directly to the plate.

Abstract: A pressurized tank filter for filtering oversized solids from a liquid wherein fluid passes through a filter media on which oversized solids are collected. A doctor blade assembly is provided for biasly engaging the filter and accumulating the solids collected thereon, where upon on each rotation of the doctor blade they engage a wiper means which causes a cleaning thereof.

Abstract: Discloses transportable liquid clarifying and screw conveyor/compactor liquid-solid separator apparatus which includes a pressureable clarifier vessel portably mounted on a base with a top and sides converging to the bottom of the vessel for attachment to a sludge disposal apparatus. A sludge inlet enters the top of the vessel and extends to near the bottom of the vessel. An effluent discharge flow control valve is connected through a conduit in the top of the vessel to provide a designated back pressure within the vessel while controlling the discharge flow of effluent liquid from the vessel. The sludge disposal apparatus includes an elongated screw conveyor/compactor mounted at an angle and extending upwardly from the vessel bottom. The compactor housing is tapered to compact the sludge as the screw conveyor carries the sludge to a liquid extraction section. The liquid extraction section has a screen tapered to further compact the slurry while extracting liquid being forced out of the slurry.

Abstract: A device for mechanically purifying liquids in a pipeline includes a rotation-symmetrical sieve chamber forming a section of the pipeline and having an inlet with a central axis, a rotation-symmetrical sieve body having an inner surface and being disposed in the sieve chamber at an angle of substantially 30.degree. to 60.degree. relative to the central axis of the inlet, and a suction removal device for removing deposits from part of the inner surface of the sieve body, the suction removal device being coaxial with and upstream of the sieve body in flow direction of the liquid, and the sieve body and the suction removal device being rotatable relative to each other for successively sweeping all of the inner surface of the sieve body with the suction removal device.

Abstract: A device for removing material screened or filtered out of a liquid flowing in a channel. It consists of an unpowered cylindrical grating that merges into a screw-type conveyor. The grating slants down, partly immersed in the liquid, to the bottom of the channel. The bars of the grating extend over its total length leaving longitudinal interstices between them. The upward-sloping conveyor comprises a housing, a shaft, and a worm and conveys the screened-out material to a depositing point. The worm picks up the screened-out material as it scrapes the bars of the grating and conveys the material upward, constantly keeping the grating clean. The grating bars (8) are more or less triangular or trapezoidal in cross-section, with rounded-off edges, and positioned in such a way that one side (25) of the triangular or trapezoidal cross-section is oriented tangential to the circumference of the conveyor worm (16).

Abstract: A fluid filtering system which includes a fluid filtering unit having a localized cleaning arrangement. The fluid filtering unit comprises a filter element through which the fluid being filtered is passed and structure for cleaning the filter element without interruption of the filtering operation of the unit. The cleaning structure includes a cleaning head which ejects fluid under pressure and which is moveable relative to the filter element to bring about localized cleaning of the element. Preferably, the filter element is moved, by an hydraulic arrangement to bring about localized cleaning over the whole of the filter element.

Abstract: A high consistency pressure screen comprises a screen including a profiled inner surface and a rotor including a profiled outer surface rotating adjacent and spaced from the profiled screen to produce a positive-negative pulsation cycle of approximatey 50%--50%.

Abstract: An apparatus for removing solid particles from cooling water having a tubular housing (1), a funnel-shaped trap sieve (4) attached to the inner housing wall with the tip facing in the flow direction, and a pressurized water sprayer (11). The sprayer includes a washer arm (14), concentrally rotatable about the downstream side (23) of trap sieve (4), and having at least one slit nozzle (15) directed toward the downstream surface (23). A suction tube (8) extends into a collecting chamber (10) of trap sieve (4). To prevent large particles from jamming rotating components, trap sieve (4) is cleaned by spraying water only against the downstream side. The tip of the sieve is defined by a cylindrical container (5) having a closed bottom (6). The intake end (9) of suction tube (8) extends into the container. Wash water is introduced into washer arm (14) through an inner end fixedly attached to a hollow flange (13) mounted on a rotary shaft (12) of pressurized spray apparatus (11).

Abstract: The invention relates to a sieve for a paper pulp scrubber or similar equipment, and to a method for fabricating such a sieve. The sieve is produced by mechanical interfit of bars with support members, the bars carrying notches, the lips of which engage at least one V-shaped lateral groove formed in each support member, while the support members present, on their face receiving the bars, a first set of notches for positioning the bars. The cross-section of the support members at the level of the first notches has the same configuration and dimensions as the cross-section of the second notches and the cross-section of bars at the level of notches has the same configuration as the cross-section of notches formed in the support members. Assembling is made by bending a bar by an angle of about 20-25.degree. for widening a second notch and inserting a support member therein. The bar is then straightened back, so that the support member will be firmly clamped in the notch.

Abstract: A combination borehole drilling apparatus and a separator for receiving a three phase gas, liquid and solid mixture, from the borehole, and venting the gas, separating the liquid from the solid, collecting and discharging the solid and recycling the liquid to the borehole drilling apparatus.

Abstract: The present invention relates generally to improvements in an apparatus for effecting solvent extractions using liquefied gas or gases in the supercritical state as the solvents and specifically to an apparatus for separating solids from fluids at high pressures.

Abstract: A method and apparatus for removing stringy contaminants from a pulp in a wastepaper recovery system having a pulping vat with an elongate helically shaped rod in the vat with means for causing a relative rotation between the stock and the helical rod so that long slender contaminants will be captured and climb the rod. In one form, multiple helices are employed and the rods may be driven in rotation, or the stock caused to rotate about the helix by other means.

Abstract: A screen plate and plate and method of making a screen plate for the pressure screening of papermaking stock in pressure screening apparatus includes slots which have been cut therethrough by a machining laser beam focused at the inlet side of the plate, to provide slots with nearly straight walls with minimum taper, and which are recast and have a "glassy" appearance by reason of the melting and resolidification of the immediate wall surface, to provide a low friction path for the stock. Straight, curved and inclined or slanted slots are disclosed including slots which are at a diagonal to the axis of the cylinder. Slots or openings are disclosed which are inclined to a radius line therethrough both with and against the direction of flow of the stock along the inlet surface. Wear bars are applied to the plate for coaction with the rotating foils on the screening apparatus, in the form of strips of weld material of high hardness applied directly to the plate.

Abstract: A counter-current process for purifying chemicals using cyrstal purification. The unit process has a purification and recovery section which contain substantially identical stages. In operation, the unit process purifies the chemical by utilizing sequential recrystallizer. The size and purity of the crystals increases from the last recrystallizer in the recovery section through each subsequent stage to the last recrystallizer in the purification section.

Abstract: An improved screening apparatus for fiber suspensions is provided comprisingat least one stationary, generally cylindrical screen drum into which the fiber suspension is fed having a central axis and a plurality of apertures through which rejectable material from the suspension cannot pass and is retained on a reject side of the drum and through which accepted fibers from the suspension can pass to an opposite side of the drum;a generally cylindrical rotor, co-axial with the axis of the cylindrical screen drum;the rotor supporting a series of blades arranged circumferentially about the rotor and substantially aligned with the longitudinal axis of the rotor, with the lateral extent of each blade being adjacent the surface of the cylindrical screen drum; andeach blade in the series of blades having opposing ends and being inclined in the opposite direction to any adjacent blade relative to a line in the circumferential path of the blades which is parallel to the longitudinal axis of the rotor and the cylindrica

Abstract: An apparatus for separating a mixture of solid and liquid components including a tank for the mixture with at least one inlet for the mixture under pressure and at least one outlet. One or more separators are provided within the tank and including one or more circular-cylindrical filter elements within the tank. Each of the filters includes a wall portion which is permeable to the liquid component of the mixture. Further, a helical transporting and scraping element is mounted within the circular-cylindrical wall of the filter and is sized so as to scrape the solid component of the mixture as cake from the inner wall of the filter and return it to the mixture within the tank.

Abstract: Apparatus has a rotary drum provided with a heating jacket therearound. The drum is mounted on a base pivotally supported on a pedestal. The base can be caused to take different orientations so as to enable the drum to take different attitudes. While the drum is in a vertical position, a mixture of fine particles and a liquid is supplied into the drum through a supply passage formed axially in a rotary shaft which extends into the drum rotatably and axially slidably relative to the drum. The mixture is filtered through a filter disposed in the drum. Filter liquid is discharged to the outside. The particles are prevented from passing through the filter and remain in the drum. Thereafter, the particles are heated and dried by a heating jacket on the drum while the drum is caused to assume a horizontal position and being rotated. The drum is then inclined such that the initially upwardly directed end thereof is directed obliquely downward.

Abstract: A screen and a coaxially radially spaced rotor provide a fluid passage for the fibrous material--liquid suspension. The rotor surface has the effect of pumping or assisting a flow of dilution liquid from the reject end towards the inlet end of the fluid passage, thereby partly or wholly offsetting the natural thickening of the suspension during screening.

Abstract: The present invention relates to a raking apparatus which has at least an upper section and a rake section rotatably coupled to the upper section for rotatable movement from a first position spaced from the bar screen to a second position for removing debris from the bar screen. The rake section moves from the first position to the second position under the influence of a counterweight or other biasing force. A shock absorber placed between the rake section and the upper section controls the forward motion of the rake section to prevent damage to the rake apparatus from uncontrolled forward movement of the rake section from the first position to the second position.

Abstract: A drum with a wedge-wire filter screen is submerged in a dirty coolant tank and filters machine tool coolant when vacuum is applied to the inside of the drum by means of a suction line at one end of the drum. The vacuum draws the coolant through the screen and into the inside of the drum for discharge through the suction line. During the filtering process, a filter cake builds up on the outside of the screen and must be periodically removed therefrom. To remove the filter cake while enabling the use of a simplified sealing structure between the drum and the suction line, the drum is supported in a rotationally stationary position, a scraper is supported to rotate around the drum, and the scraper is intermittently indexed to shave filter cake from the screen.

Abstract: In screening apparatus for paper making stock including a housing, a cylindrical perforated screen member separating the interior of the housing into a supply chamber and an accepts chamber on the inside and outside respectively of the screen member, an inlet port for supplying stock to one end of the supply chamber, an outlet port from the accepts chamber, a reject port from the supply chamber, and a rotor mounted for rotation within the screen member, the rotor is characterized by comprising a substantially circular disk which is of a thickness constituting a very minor fraction of the axial length of the screen member and has vanes mounted on its outer periphery which extend lengthwise of the screen member for rotation with the disk in the annular space between the periphery of the disk and the inner surface of the screen member.

Abstract: There is provided a fluid filter system cleanable by suction. The system comprises a filter element fixedly attached to a substantially rigid filter-element support mounted in a filter housing and provided with a plurality of openings, at least one suction nozzle having an inlet opening located in close proximity to the filter element and adapted to move with its inlet opening past the filter element in such a way as to cover, in succession, at least some zones of the filter element while producing a suction flow. The invention further comprises guide means for guiding a fluid stream from the high-pressure raw-fluid space of the filter housing to a low-pressure zone created by the suction nozzle between the inlet opening thereof and that portion of the filter-element support which faces the suction nozzle.

Abstract: A screen for fibre pulp is provided with means for removal of light reject. The screening apparatus comprises a vertical cylindrical screen (2); and a rotor (3) which is concentrically disposed inside the screen and the substantially closed outer surface (9) of which together with the inner surface (10) of the screen defines a screening zone (11) for the pulp. A pipe (19) is provided inside the rotor (3) the upper end of the pipe being disposed adjacent to the inner surface (21) of the closed upper end (12) of the rotor (3).

Abstract: Apparatus is disclosed for the separation of admixtures from contaminated thermoplastic materials. The apparatus has a distributor screw, a retainer chamber and return flow holes for contaminated materials to pass from the retainer chamber into an annular space formed between the distributor screw and the screening element within the pressure chamber. The materials circularly travel around saw-like teeth of the distributor screw and back through the flow holes into the retaining chamber. The retainer chamber and the annular space are openly connected to each other at the inlet side of the pressure chamber. Purified materials exit through one outlet exit and admixtures exit through a second exit.

Abstract: An apparatus is described for separating the liquid portion from the solid portion of a liquid, finely disperse system, for example ceramic slip, having a worm (12) provided in a cylindrical housing (14), driven and surrounded by a filter aid (13), means for supplying slip at one end of the housing and a narrow solid discharge located on the worm axis at the other end of the housing, in which apparatus the filter aid (13) is inserted (at 21) so as to be secured against rotation in a massive casing forming the cylindrical housing (14), this casing being provided on its surface facing the filter aid (13) with a plurality of spaced peripheral grooves (15) which open out into a filtrate outflow (5), and the surface of the filter aid (13) facing the worm (12) being covered with an abrasion-proof, sufficiently wide-meshed screen (17), thereby creating a worm channel with a flat design, in which the slip is circulated so strongly by the relative movement between the worm and the worm cylinder that the liquid concent

Abstract: A sieve device for cleaning plastic melts in a high-pressure press consists of a known plate-like housing. The housing has a flowthrough bore that constitutes part of the flow channel of the press. The housing also has a sieve disk positioned in the flowthrough bore. A sieve-cleaning mechanism rests against the sieve disk. The mechanism consists of a plate, which has several perforations and which projects to some extent out of the housing. It is mounted upstream of the disk inside the housing and can move in such a way that at least one perforation is always in the flow channel and at least one perforation is always outside the housing. Contamination on the upstream side of a disk is removed by shifting the perforation being employed at a given moment out of the housing.

Abstract: The sorting apparatus contains a screen forming at least part of a circular-cylindrical surface and a rotor having a rotor shaft which is coaxially located at the lengthwise axis defined by the circular-cylindrical surface. The rotor possesses clearing blades and propelling blades arranged to follow or trail the clearing blades as seen in the rotary direction of the rotor. The clearing blades each comprise a front-positioned clearing edge which moves along the screen and a run-up surface which is inclined relative to a radial direction defined by the rotor. The run-up surface moves the fiber stock in a direction towards the rotor shaft and provides an open through-passage in the central region of the rotor. The propelling blades extend from the rotor shaft towards the screen and terminate at a distance from the surface defined by the screen.

Abstract: A rotor for a sorting apparatus for cleaning fibrous suspensions such as produced from the making of paper is described. The rotor is equipped with sorter blades which extend substantially parallel to the axis of rotation and are set at a desired angle relative to the direction of rotation of the rotor so as to create a hydrofoil effect. The sorter blades are mounted to one or more supporting walls shaped in a spiral form to provide spiral surfaces which are coaxial with the axis of rotation of the rotor and impart a conveying motion to the fibrous suspension. Upon rotation of the rotor in a fibrous suspension entanglements by impurities are avoided and the danger of the occurrence of a blockage of the strainer used in the sorter apparatus is reduced.

Abstract: Apparatus particularly useful for the removal of iron particles and other magnetic solids from printing ink. Included is a casing (22) through which flows a liquid to be clarified. A plurality of straight bar magnets (M), mounted to the inside surface of a tubular sheath (50), are magnetically attached to the outer surface of the casing for creating magnetic fields within the casing. The magnetic solids contained in the liquid are magnetically attracted to the inside surface of the casing and so are separated from the liquid. The detachment of the magnets from the casing causes the separated solids to settle to the bottom of the casing for easy discharge through a drain port (38) formed therein. A cartridge filter (28) is provided centrally within the casing for the separation of nonmagnetic solids from the liquid.

Abstract: Sorting screen for fibre suspensions comprising a screen wall having recesses on a first side and narrower sorting apertures on the other, second side, these apertures opening into the recesses and the recesses each extending over a plurality of sorting apertures and being spaced in all directions from one another such that the screen wall has a net structure on its first side between the apertures. In order to achieve the utmost fineness when sorting with such a screen the recesses are arranged on the inflow side of the screen wall and the sorting apertures are designed as bores.

Abstract: An extrusion device used for extracting liquids from liquid-solid mixtures and which operates on the separation gap principle, comprising a screw rotating in a barrel. Pins project radially inwardly into the barrel. The separation gaps and the internal lining of the barrel are maintained in an operationally efficient state for long periods of time even if highly abrasive and/or corrosive mixtures are being treated. The internal surface of the hollow barrel is lined with individual, interchangeable segments which are peripherally staggered relative to one another in the form of a wall, end face or tip portions are located on the end portion of the pins. Moreover, the screw comprises a mandrel on which are mounted individual screw flight portions. Between the flight portions, ring portions are mounted on the mandrel. These ring portions and the tip portions mounted on the pins define the separation gaps. Accordingly, those parts which are liable to wear or corrode can be readily replaced.

Abstract: An apparatus for removing liquid from a solid suspension includes a screw conveyor in a housing having a suspension inlet, a liquid outlet and a separate outlet for the thickened solids. To increase the thickening effect, the faces of the screw threads are coated or treated to cause the coefficient of friction of the front, thrust faces to be higher than that of the rear faces. The coefficients can also be varied longitudinally, either continuously or in stages.

Abstract: A process for fractionating a suspension of solid particles in a liquid, of he type wherein said suspension is made to pass through a filtering screen, characterized in that said suspension is directed in a direction parallel to the longitudinal axis of an elastically deforming, flexible, perforated sleeve forming a filtering screen, and in that a sequence of high and low pressures is continuously created within this sleeve and travels at least predominantly opposite the direction of the suspension flow. The invention also applies to equipment.

Abstract: A rotating sorter is provided for the removal of minuscule pollutants from fiber material suspensions by means of a symmetrical fixed filter basket disposed in a fixed spiral-shaped housing and in whose interior a generally vertical axle rotates sorter vanes in close proximity to the filter basket. Fiber material suspension to be sorted is delivered to a generally ring-shaped sorting space formed between the filter basket and housing. The direction of flow of fiber material suspension delivered to the filter basket occurs substantially tangentially thereto and generally perpendicular to the rotating axle, and quality material is sorted into the interior of the filter basket.

Abstract: A pellet dryer is disclosed for removing plastic pellets from entraining water and drying the same. The rotating structure of the pellet dryer is essentially contained and supported on a door of a cabinet, so that the opening of the cabinet door exposes the pellet dryer structure and the interior of the cabinet for cleaning.