Abstract: Membrane filter plate for a filter press or the like, with a carrier plate, at least one membrane arranged on one side of the carrier plate and preferably provided with spacing cams or the like for applying a filter cloth or the like and a sealing edge surrounding the carrier plate and membrane and interconnecting them in a substantially flow medium-tight manner, the peripheral surface or surfaces of said sealing edge parallel to the carrier plate median plane being arranged in the unloaded normal position thereof on the side having the membrane or on either side of the carrier plate, while being spaced from the membrane plane, wherein the contact surface of the carrier plate facing the membrane runs towards the carrier plate median plane in a transition area located between the connecting line of the membrane with the sealing edge and the central area of the carrier plate, in which it extends parallel to said central plate median plane.

Abstract: Composite, unbreakable plates for filter-presses are formed by the firm assembly of, in succession for each plate, a first thin frame 1 collecting the filtrates, a grooved resilient membrane 4 to squeeze the cake, a second thin frame 3 forming a chamber for the fluid inflating the membranes, a second similar membrane, and a third thin frame similar to the first frame. The filtration composite plate cooperates with a frame or is a recess plate which is spaced for unloading of the cakes collected. Each plate or frame has a small jack operating between small extensions at the top of the frames or on top of the plates for separating the plates.

Abstract: This invention provides a filter cloth assembly for use on a filter plate of a center-feed filter press, which comprises a two-part filter cloth with fittings for rapid and easy assembly on the filter plate, one cloth on each side. Methods of manufacture of the novel assembly and its parts and a new method for bonding otherwise incompatible plastics and elastomers are disclosed.

Abstract: A membrane filter press has a series of filter plates having an imperforate pipped membrane mounted on each side or one side thereof. Inlet ports are provided with a cantilevered retainer which support adjacent portions of the membrane when the membrane is expanded to effect a squeezing of filter cake deposited on filter media carried by pips on the membrane. The retainer may be circular in the case of a center inlet port or linear in the case of a corner inlet port. Corner outlet ports are provided in the filter plate, with the plate having a linear collection groove juxtaposed to an outer edge portion of the membrane so that filtrate flow from around the membrane pips to the collection groove and by passages only in the plate are conveyed to an outlet port. A beaded membrane rib enhances the connection of the membrane in a filter plate groove at a position adjacent to the plate seal face of adjoining filter plates.

Abstract: Membrane filter plate for a filter press or the like, with a carrier plate, at least one membrane arranged on one side of the carrier plate and preferably provided with spacing cams or the like for applying a filter cloth or the like and a sealing edge surrounding the carrier plate and membrane and interconnecting them in a substantially flow medium-tight manner, the peripheral surface or surfaces of said sealing edge parallel to the carrier plate median plane being arranged in the unloaded normal position thereof on the side having the membrane or on either side of the carrier plate, while being spaced from the membrane plane, wherein the contact surface of the carrier plate facing the membrane runs towards the carrier plate median plane in a transition area located between the connecting line of the membrane with the sealing edge and the central area of the carrier plate, in which it extends parallel to said central plate median plane.

Abstract: A method and device for installing gasket members between two adjacent flat plate structures including removably attaching a gasket member on each side of a frame member to form a frame member and gasket member assembly, interposing the frame member and gasket member assembly between at least two cell frame members disposed adjacent to each other, and contacting the flat plate structures with the frame member and gasket member assembly such that the gasket members adhere diametrically opposed to each other on the flat plate structures. The frame member includes a rib portion around the outer periphery of the frame member, the rib portion forming a pair of shoulders opposite each other and facing away from each other and adapted for receiving a pair of gasket members such that the gasket members contact the rib portion and protrude a predetermined distance beyond the shoulder members.

Abstract: The present invention relates to a filter press. The filter press includes a plurality of filter plates each of which comprises a filter frame having a space therein. The filter plate has a simple construction, providing the effect of reducing the weight of a filter press as a whole and protecting a filter press from damage by the filtering compression.

Abstract: An apparatus for effecting the separation of filter plates within a filter press for washing is disclosed. The apparatus includes a guide track having mounted thereon a slidably reciprocal carriage. The carriage includes multiple pivoted pawls having an abutment surface defined thereon for contacting a filter plate to be transported. The pawl is held in a raised orientation by a resilient spring means. The carriage is driven along the guide track by a pressure displaced piston in a rodless cylinder or tubular member. Positioned within the tubular member are two pressure chambers, one on each end of the piston. Pressurized fluid is controlledly introduced into one or the other of those chambers to effect a displacement of the piston. A pair of shifter carriages are provided at the top of and parallel to the filter stack. A plate washer includes a vertical pair of rodless cylinders connecting a pair of vertically movable cross-bars, each cross-bar mounting a series of wash spray nozzles.

Abstract: A filter plate which is longitudinally partitioned between its inlet and outlet ends, and features liquid feed and collection troughs at the respective ends. Such plates may be associated in opposed, relatively inverted pairs to form enclosed flow channels characterized by fluid flow rates which are substantially uniform across the full transverse extent of the flow path and which facilitate the utilization of the full areal extent of the filter media employed therewith. Also described is a unitary filter element which may be usefully employed in the filter. The filter of the invention may be highly efficiently employed for dewatering of aqueous biomass suspensions, desalting of proteins, removal of secreted metabolites from cellular suspensions, and the like.

Abstract: A filter plate which is longitudinally partitioned between its inlet and outlet ends, and features liquid feed and collection troughs at the respective ends which are of progressively decreasing depth from the medial part of the trough to the extremities thereof. Such plates may be associated in opposed, relatively inverted pairs to form enclosed flow channels characterized by fluid flow rates which are substantially uniform across the full transverse extent of the flow path and which facilitate the utilization of the full areal extent of the filter media employed therewith. Also described in a unitary filter element which may be usefully employed in the filter.The filter of the invention may be highly efficiently employed for dewatering of aqueous biomass suspensions, desalting of proteins, removal of secreted metabolites from cellular suspensions, and the like.

Abstract: A chamber filter press including frameless chamber plates covered on both sides with filter clothes stretched thereover, wherein two adjacent chamber plates contact each other with an outer, continuous clamping rim and define a filter chamber, consisting of a central filter cake compartment lying between the filter cloths and two outer filtrate compartments lying between the plate and the filter cloth. Repressing devices for the filter cake are arranged in the zone of at least one of the two filtrate compartments of each filter chamber. The repressing devices are fashioned as distensible cushions suspended within at least one filtrate compartment of each filter chamber at the adjoining chamber plate by marginal suspension strips which keep open, at least at the lower edge of the distensible cushion. A liquid passage is provided between the half of the filtrate compartment on the filter cloth side and the half on the plate side.

Abstract: A housing block with a first passage and a second passage extending parallel to the first passage is attached to each membrane filter plate. A piston is mounted slidably in the first passage and a spacing bolt is positioned slidably in the second passage. A first circumferential groove which is connected with a compression compartment between elastic membranes extending radially exteriorly is introduced into the center of the first passage. The piston has a plurality of, advantageously four, axially extending piston grooves which connect with the circumferential groove in the open configuration and because of that the above mentioned compression compartment is connected with the surrounding atmosphere. The operation of the pistons is positively actuated by a counterweight and the sealing bolts are positioned in succession in a row. The motion of these spacing bolts is bounded by a stop piece.

Abstract: The invention relates to an improvement of the construction of filter plates which are mounted on a filter press. The filter plates comprises a frame (1), a flat filtrate drainage guide member (3, 41, 52) disposed in the frame (1), and a supporting member (5, 5d, 40, 48, 53) for movably supporting the filtrate drainage guide member in the frame (1). The filtrate drainage guide member (3, 41, 52) can be prevented from being broken if filtration pressure applied to one face of the filtrate drainage guide member (3, 41, 52) of the filter plate (2) is much different from that applied to the other face of the filtrate drainage guide member (3, 41, 52) because the filtrate drainage guide member (3, 41, 52) is movably provided in the frame (1).

Abstract: The thermoplastic filter plate is designed for a filter press comprising a plurality of the filter plates clamped together edgewise forming a plurality of filter chambers between themselves. Each filter plate has a press wall on one or both sides of it. This press wall is at least flexible in an edge region and is movable by action of a pressurizing medium into one of the filter chambers. Each of the filter plates includes unitarily a supporting wall and a compression chamber for the pressurizing medium acting on the press wall, the supporting wall being located between adjacent compression chambers. The press wall is made in one piece with a plate frame of the filter plate. The rigid plate frame is composed of a hard plastic material resistive to the closing pressure of the filter press and the press wall is composed of an elastic plastic material guaranteeing an easy adjustability and deformability.

Abstract: A pressure device for machines for dewatering or filtering of suspensions, sludges or the like or for material to be pressed for the exertion of surface pressure on at least one circulating pressure belt which can be provided for supporting an equally circulating filter belt, which pressure device consists of an essentially completely hollow pressure bladder in the form of a closed frame in particular of essentially quadrangular shape viewed in top view of the pressure belt, which pressure bladder is subjectable to pressure medium and forms a very small, self-adjusting gap on the edge.

Abstract: Membrane filter plate for a filter press or the like, with a carrier plate, at least one membrane arranged on one side of the carrier plate and preferably provided with spacing cams or the like for applying a filter cloth or the like and a sealing edge surrounding the carrier plate and membrane and interconnecting them in a substantially flow medium-tight manner, the peripheral surface or surfaces of said sealing edge parallel to the carrier plate median plane being arranged in the unloaded normal position thereof on the side having the membrane or on either side of the carrier plate, while being spaced from the membrane plane, wherein the contact surface of the carrier plate facing the membrane runs towards the carrier plate median plane in a transition area located between the connecting line of the membrane with the sealing edge and the central area of the carrier plate, in which it extends parallel to said central plate median plane.

Abstract: Filter cake produced from a slurry is compressed in an enclosure (6) having a pair of opposed flexible walls (5) at least one of which is constituted by a filter and drainage medium. The filter cake is cyclically deformed while under compression with the filter cake supported at least one position (14, 52) within its periphery whereby the unsupported parts of the filter cake are cyclically deformed about the periphery and the position or positions of support. All parts of the filter cake are thus subjected to substantially uniform bending whereby drying of the filter cake is improved.

Abstract: A filter press comprises a plurality of membrane filter plates each comprising a base plate and an elastic membrane on at least one side of the base plate. The base plate has a circumferential raised plane edge portion surrounding a recess with a step-form recessed circumferential surface between the raised edge portion and the recess and a groove in the recessed circumferential surface and the raised edge portion. The membrane has a reinforced edge poriton of angular cross section with a first web lying on said recessed circumferential surface of the base plate and having a bevelled edge engaging the shoulder between the recessed circumferential surface and the raised edge portion and a second web received in the groove to provide a seal between the membrane and the base plate. The outer surface of the first web is recessed below the plane of the raised edge portion of the base plate.

Abstract: There is disclosed a filtering method comprising using a filter-press-type device in the chambers whereof filtering means divide a compartment for material to be filtered from a filtrate-collecting compartment, compressing the possibly-washed material to be filtered by reducing the volume of the compartments for material to be filtered, discharging washing solute and filtrate which have passed through the filtering means, and dismantling said filter-press. The method makes use of filter means which are resistant and undistortable under the method conditions, and retains the filtering means in a relative position to the filtering chamber axis which is identical during all the filtering steps.

Abstract: The inner assembly of a tube pressure filter comprises a supporting member or core (6) on which there is a facing assembled from laths (40). Each two adjacent laths (40) define between themselves a duct (42) and an aperture (44). In use, a filter element is provided on the outer surface of the facing. Filtrate passing through the filter element goes through the apertures (44) into the ducts (42) and then flow longitudinally of the inner assembly to a filtrate outlet. After filtration is complete, compressed air may be passed through the ducts (42) and apertures (44) to assist the discharge of filter cake from the filter element.In another embodiment (FIG. 6), a filter plate unit for a plate filter press comprises a recessed filter plate (102) of which the base of the recess is provided with a facing (112) made up, for example, of a plurality of laths (114).

Abstract: A membrane filter plate for a filter press with a one-piece, plastic carrier plate, at least one membrane arranged on one side of the carrier plate and provided with spacing bosses for the engagement of a filter cloth and a sealing rim surrounding the carrier plate and the membrane and connecting the same in substantially fluid-tight manner. The sealing surface of the sealing rim parallel to the carrier plate median plane being arranged on the side having the membrane or on either side of the carrier plate. At least one support boss is provided in the central region of the carrier plate. The end face of the support boss parallel to the carrier plate median plane being substantially aligned with the sealing surface of the sealing rim parallel to said median plane and provided laterally with a rotationally symmetrical transition surface facing the membrane which slopes in the direction of the carrier plate median plane.

Abstract: The invention provides a novel filter press comprising a filter chamber wall adapted to be axially displaced for exposing a plurality of filter units contained in the filter press. A certain clearance is provided between the substantially circular filter units and the interior wall surface of the housing or casing, the latter being sealed only adjacent its ends in cooperation with respective end walls. The sealing surfaces are disposed at locations away from the areas coming into contact with the filtering residues on evacuation and cleaning of the filter chamber. A particularly advantageous embodiment of a rotor for a filter press of this type is composed of rotor disks each comprising two axially displaceable rigid pressure plates which are prevented from being rotated by a hub disk interposed therebetween and non-rotatably mounted on the rotor shaft.

Abstract: The press wall is provided for a filter element of a filter press comprising a plurality of filter elements clamped together edgewise forming filter chambers for the suspension to be filtered. A filter element carries on one or both sides a press wall is attached edgewise with it which is movable by a pressurizing medium into the filter chamber. Each press wall has a plurality of sectional projections overlayed with a filter cloth on their wall surfaces directed toward the filter chamber which form a drainage system under the filter cloth. The press wall has an edge adjacent an edge region facilitating its connection to the filter element and a wall strip extending along this edge region. The wall strip is bendable at least to the extent of the displacement of the press wall under pressure.

Abstract: An apparatus for dewatering primary dewatered sludge pieces conditioned with dewatering powders comprises: a first member having a recess and a path communicating with the recess, a fluid-tight diaphragm mounted over the recess thereby defining a fluid chamber with which the path communicates, a second member having a filtrate member, and a filter member provided over the filtrate chamber. At least one of the first member and the second member is mounted to bring them into fluid-tight contact with each other, and the primary dewatered sludge pieces into a cavity defined by the diaphragm and the filter member. A pressure fluid then is fed to the fluid chamber, thereby isostatically compressing the primary dewatered sludge pieces to remove the water contained therein without substantially destroying the inner structures of the primary dewatered sludge pieces. Because of this isostatic pressure exerted by the diaphragm, the sludge pieces are compressed highly uniformly, resulting in high dewatering efficiency.

Abstract: A filter press with central suspension of filter plates (5) is provided with a guide which ensures a flush alignment of adjacent filter plates, said guide lying outside the area affected by the filter medium, being integrated in a space-saving manner into the filter press, and permitting a certain amount of twisting or other overall adjustment of the filter plate package. For this purpose, the guide device is disposed on the filter plate suspension (9, 10, 18, 25) and is composed of at least one guide rod (19, 20) which is flexible to a limited elastic degree, and runs along guide members (1,2), and of at least one guide element (21, 22) for each filter plate (5) fitting around guide rod (19, 20), said elements being disposed on yoke piece (25) which supports rollers (19, 10) of the filter plate suspension.

Abstract: An apparatus for compressing and shifting flat plate-type structures including first and a second support members for supporting side rails attached generally perpendicular to the support members in a generally parallel and spaced apart position adapted for supporting any number of flat plate-type structures slidably mounted thereon, and a mobile platen for pressing the frame structures together, the improvement being an elongated slider member slidably mounted on the top portion of the side rails for slidably shifting the flat plate-type structures along the top and along the axis of side rails after clamping a plurality of cell structures, for example, to one stationary support member and clamping another plurality of flat plate-type structures together, thereby selectively shifting the desired flat plate-type structures a desired distance apart to remove or replace a flat plate-type structure or its internal parts disposed between the flat plate-type structures.

Abstract: A membrane plate to be assembled with further plates to form a filter press in which a respective filter chamber is formed between the membrane plate and each further plate adjacent thereto, the membrane plate includes a plate member composed of a plate wall portion having a peripheral region provided with a groove, and a continuous plate frame portion surrounding the plate wall portion and secured to the plate wall portion at the peripheral region, a flexible press membrane disposed adjacent the plate wall portion to be acted upon by a pressure medium, the membrane having a continuous bead extending around its periphery and seated in the groove, a retaining frame member disposed adjacent the bead and the periphery of the membrane at the side of the membrane directed away from the wall portion, and elements connecting the frame member to the plate frame portion for permitting movement of the frame member transverse to the plate wall portion between a first position in which the frame member presses the bead i

Abstract: A filter wall constructed separtely from the frame member is clamped in a clamping slot, to which toward the outside edge of the filter plate a widened sealing slot in a shoulder of the support is connected. A projecting edge of the filter wall extends into the latter slot with the shoulder overlapping, the filter wall having an annular flange directed to the outside. The seal is arranged in the sealing slot and has a U-shaped cross section with two arms extending inwardly, whose arms enclose and seal both sides of the annular flange and which seals the support on one side and the frame member on the other side. The spacing between the seal and the joint is sufficient that upon release of the closing pressure of the filter press, without disengaging it, the frame can be moved sufficiently far from the support that the pressurizable chamber is unsealed at the seal in the sealing slot.

Abstract: Membrane filter plate for a filter press or the like with a carrier plate and sealing rim, in which the actual membrane and the sealing rim frame are made in one piece from solid plastic and the thus constructed frame membrane is connected to the carrier plate in sealing and self-centering manner.

Abstract: A filter cloth securing device attaches a filter cloth in the zone of the slurry port of a filter plate. A plurality of face-to-face arranged filter plates constitute a filter plate stack of a plate filter press. Each filter cloth securing device has two flanged sleeves inserted from either side of the slurry port and a threaded tightening sleeve which passes through the slurry port and which tightens the flanged sleeves to one another to thus clamp the filter cloth against the filter plate face. In the closed state of the filter plate stack face-to-face oriented flanged sleeves belonging to consecutive filter plates define an annular clearance and further, at least one flanged sleeve of the filter cloth securing device has on its outer face at least one protuberance which projects towards the outer flange face of an adjoining flanged sleeve, belonging to a consecutive filter plate. The protuberance ends at a distance from the last-named outer flange face.

Abstract: The chamber filter press has chambers, which in each case include a hollow space for receiving pulp as well as a hollow space for receiving filtrate on the one or the other side of a filter medium and can be opened after the filtering operation for removal of the filter cake from the respective filter medium as well as from the respective hollow space for receiving pulp. The hollow spaces for receiving pulp are in each case provided with a rotatable as well as an axially displaceable rotor for agitating the pulp, as well as for kneading the filter cake with stirring and compression during the filtering operation and for compressing as well as removing the filter cake after the filtering operation. The chambers can be opened for the simultaneous removal of the filter cake by means of the rotors from the hollow spaces for receiving pulp of all chambers, or first from those of one end and then from those of a second group of chambers simultaneously or simultaneously in each group.

Abstract: A filter is described which is particularly designed for use in a high pressure separating press, e.g. a cocoa press, so as to considerably increase the useful life of the filter by avoiding breakage of metal screen components. The filter is characterized by positioning of the screen components in a metal ring provided with a peripheral flange which extends in a radially inward direction towards the axis of the filter, the inner diameter of which flange differs from the inner diameter of the ring by about half the difference between the diameter of the pitch circle of the outer groove of the press platen and the inner diameter of the ring.

Abstract: A membrane plate for a chamber filter press over which a filter cloth may be stretched on both sides thereof. The membrane plate includes an exchangeable substantially planar membrane member which is loosely enclosed between a bracket plate and a frame and is adapted to be clamped tightly between the bracket plate and the frame only by the closing pressure of the chamber filter press. The bracket plate and the frame, when the filter press is open, are adapted to be moved apart from one another along slide bearing pieces by a distance of 1 to 3 mm until the movement is limited by a stop. By enabling a relative movement when the filter press is open, the membrane is vented during times of stoppage of the open filter press or during ejection of a filter cake or a washing of the filter cloths so as to enable the membrane to readily readjust.

Abstract: A filter press, for cake or precoat filtration, including one or more filter units, each of which includes slurry frames, filter plates, and support sheets or surfaces. Each of the filter plates is provided with at least one filtrate discharge, and each support sheet or surface, which is disposed on one side of a given filter plate, has associate therewith one of the slurry frames, which has a filling space which is directed toward the caking side of the support sheet or surface, an upper and lower connection for venting and discharge, and a supply conduit for medium which is to be filtered. Associated with each of the slurry frames is a distribution chamber which communicates with the filling space of one of each of the support sheets or surfaces, which are in a sealed state with the slurry frame via a press border. The communication is established via a partition which borders one of the filling spaces and extends parallel to the support sheet or surface.

Abstract: The invention relates to the attachment of a filter mat (10), woven from stainless steel wire, to a press plate (8) of a cocoa press. It is known to insert the bent-over edge part of the mat (10) into a groove (15) in the press plate (8) and fix it by means of a pressed-in cord (19). In order to avoid the mat being broken at the place of bending, it is proposed according to the invention that the opposite walls (16, 17) of the groove against which the peripheral edge of the filter mat (10) and the cord (19) are pressed should form an angle between 25.degree. and 55.degree. with the surface of the press plate.

Abstract: A membrane filter press comprises a plurality of one piece plastic base plates having on opposite sides recesses each bounded by a lower inner peripheral portion surrounded by a higher outer peripheral portion. In the lower inner peripheral portion of the base plate there is a circumferential groove. On each side of the base plate there is a membrane of elastomeric material. The membrane is planar in unstressed condition and has a marginal portion seated on the lower inner peripheral portion of the base plate. A rib on the membrane is received in the circumferential groove of the base plate. An inlet for a suspension to be filtered provides inlet passages into spaces between filter cloths of adjacent filter units. At a position for filtrate outlet, passages in the membrane and the base plate connect with a filtrate outlet opening.

Abstract: A filter press tray separating device has a latch and a pawl for engaging neighboring plates to be separated from the end of a pack of plates and means for separating the pawl from the latch while they engage respectively the end and next-to-end plates of the pack so that the separating force exerted by the pawl on the end plate is matched by an opposite reactive force exerted by the latch on the next-to-end plate, the device including means for disengaging the latch and pawl when a plate has been separated and for repositioning it at the next pair of plates to be separated. The latch and the pawl are both carried by a movable carriage means that moves along a stationary frame that extends along the longitudinal axis of the pack of plates.

Abstract: Filter cake formed from a slurry is dried in a filter press comprising a plurality of filtration units each having a chamber bounded by a pair of opposed flexible walls with at least one of said walls being constituted by a filter medium. The flexible walls are sandwiched between flexible membranes. The filter cake is formed and compressed in the chambers by hydraulic fluid pressure acting on the flexible membranes. By means of pressure oscillations set up in the hydraulic fluid, the filter cake in the chambers is deformed by bowing from side to side of an initial central plane, whereby drying is improved.

Abstract: A lightweight, substantially hollow filter plate constructed of foam molded thermoplastic material is formed by two separate identical plate sections each having a forward and rearward face. In a recessed type plate, the peripheral area of the rearward face of each section includes a plurality of support ribs arranged in lattice type configuration. In one embodiment the plate sections are integrally joined together with their rearward faces opposing each other and with the support ribs of one section butting against the opposing support ribs of the other section to produce a cellular construction light in weight but yet sufficiently strong to withstand the operating pressures normally associated with standard filter press machines.

Abstract: A filter-press plate assembly has a substantially rigid support plate having a face formed of a central region and an outer periphery bounding the region, a substantially rigid annular frame having an annular face at least closely confronting the support-plate face at the periphery, and a generally planar and elastically deformable central filter panel formed integrally with the frame and engageable with the central region within the periphery. The filter panel forms a pressurizable chamber with the support plate so that pressurization of the chamber can press a filter cloth lying on the filter panel toward another such filter cloth of an adjacent such assembly. An annular groove formed at the outer periphery in one of the faces is open toward the other face and an annular ridge formed on and projecting from the other face fits in this groove. Respective seal rings are recessed in the plate and frame and project oppositely therefrom at the outer periphery.

Abstract: A liquid filtering apparatus comprises upper and lower platens and a plurality of intermediate plate members between the platens. When pressed together with a sheet of filter media between each pair of adjacent plates, a fluid-tight chamber for incoming liquid to be filtered is formed on one side of the filter media. When the filter media requires replacement, the upper platen is lifted to separate the plates. Each plate is provided with combined alignment and stop means so that when the plates are again brought together after renewal of the filter media, they will automatically resume their normal stacked position in proper alignment, the stop means also providing a preselected amount of space between adjacent plates to cause a desired amount of compression for a sealing member between the plates. The alignment and stop means is designed to absorb the compression load on the plates, thereby enabling them to be made of lighter metal or plastic materials without overstressing their side walls.

Abstract: A method and apparatus for manufacturing plates of thermoplastic synthetic material or the like by compression molding is disclosed, wherein a mold comprising a respective, horizontally, disposed upper and lower part is first filled with synthetic base material in granular form or the like, is subsequently heated while being pressure-charged and closed for the purpose of melting the synthetic base material.

Abstract: An expressing plate assembly for an expression type filter press, wherein openings in the four corners of elastic expressing sheets placed on the opposite surfaces of a core plate are aligned with openings in the four corners of the core plate and in such condition the expressing sheets are secured to the core plate. Seating recesses in the form of circles concentric with the above-mentioned openings are formed in the opposite surfaces of the core plate, while raised portions adapted to tightly fit in the recesses are formed on the expressing sheets. Clamping seating rings are fitted in recesses on the outer side of the recesses. Each clamping seating ring is formed with grooves for filtrate.

Abstract: A single pass filtration process for the removal of suspended solids from completion fluids used in oil or gas well drilling operations which utilizes pressure injection of these fluids into a filter having pattern filter plates.

Abstract: The thickness of filter plates is a parameter determining the size of the useful volume of filter presses.It is desirable to provide a filter plate which can be dimensioned substantially thinner than heretofore and which moreover can be manufactured in supersize dimensions of, for example, an edge length of 3 m.times.3 m. To provide for high stability and a certain flexibility thereby enabling in a manufacturing of very large filter press plates having relatively thin bottom portions, the bottom portions of the filter plate is divided into at least four quadrants with each of the quadrants including outwardly curved portions, and with the outwardly curved portions of adjacent quadrants being in opposite directions with respect to a center plane of the filter plate.

Abstract: A diaphragm type cake compressor for filter presses employing recessed plates, which compressor comprises a planar panel of quadrilateral configuration and formed from a suitable inert material to define a lower central slurry feed through opening and at its corner portions at least one filtrate passing aperture and at least one separate wash passing aperture, which panel has applied to each face of same an elastomeric membrane, which membranes are secured in place by double sided adhesive tape applied about the margins of the panel and membranes, in circumambient relation thereto, with the membranes being coupled together and through the panel slurry feed through opening in sealing relation thereto to define the slurry feed through port of the compressor, and with the membrane being apertured to correspond to the panel filtrate and wash apertures, which apertures are sealed off from the slurry by adhesive tape bonding of the membranes to the panel.

Abstract: A clamping device for holding beehive honeycomb frames within the rotating reels of a centrifuge. The clamp includes a pair of parallel bars biased apart by spring pins and held at one end by a hinge pin connected to a holding bracket which is affixed to the inside face of the centrifuge reel. The other end of the spring-loaded parallel bars snaps into bosses mounted on a second holding bracket affixed to the opposite inside face of the centrifuge reel. To remove the clamp, the user extends his hand across the spring-loaded bars and tightens his grip to compress the bars together so that one end of the bars will disengage the bosses. The user then pivots the whole clamp about the hinge pin so that the frames can be removed.

Abstract: A substantially cylindrical filter chamber having a lower horizontal bottom plate, a side wall and an upper horizontal bottom plate, is divided into two compartments having a bottom plate and a side wall by a planar horizontal support fabric. In each compartment, a movable wall is associated with the bottom plate, the movable wall being adapted to reduce the volume of the respective compartment to approximately zero. The support fabric serves as a carrier for a precoat filter layer and is clamped along a ring-shaped, preferably reinforced, rim region between the adjacent faces of said side walls. Further, each movable wall is also clamped along a ring-shaped rim region between the side wall and the adjacent bottom plate of the compartment.

Abstract: In a plate filter press with filter plates (8) suspended on support guides (3, 4), which filter plates are guided along stop rails (23, 24) for the purpose of preventing pendulating oscillations, the oscillation protection is to be constructed so that a required filter plate replacement or filter cloth exchange can be carried out without disassembly of the oscillation protection.For this purpose, the provision is made that the stop rails (23, 24) can be operatively adjusted away from the filter plates (8), and to attain this objective, the stop rails are preferably pivotable about axles (30, 31) extending in parallel to the longitudinal axis of the filter press.

Abstract: An improved filter plate of the type used with a vertical stack of other such plates to form an industrial filter of the type known as a horizontal plate filter. The improved filter plate has a generally upright side wall, and a divider plate or transverse planar plate portion secured to the side wall below the upper margin thereof. An open top trough is formed in the divider plate to receive the filtrate passing through a filter medium above the filter plate when the latter forms a part of a horizontal plate filter. A hole in the side wall permits the filtrate to be removed from the trough. The filter plate further includes a fluid inlet conduit and an air vent/blowdown conduit extending through the side wall into the space below the divider plate. The trough and removable conduits eliminate the need for fixed baffles for use as the fluid inlet, outlet, and blowdown means as found in a conventional filter plate.