Abstract: Method and drum filter for thickening of slurry and for treatment of the slurry with liquid. The slurry to be thickened is passed onto the filter face of a drum (3) revolving in a basin (3), and the treatment liquid is passed through the pulp web formed on the drum. The consistency of the pulp web is increased by pressing a compression plate (10) against the pulp web. The compression force of the compression plate (10) is produced by means of the pressure of a liquid and/or gas passed to the convex side of the plate. The compression force can be adjusted by adjusting the pressure prevailing in the gas space outside the drum (3).

Abstract: A granular media filter has an underdrain system for use in a granular media filter comprising perforated lateral conduits arranged for the distribution of air and water for scouring and backwashing of the filter. Each conduit is in the form of a single linear conduit containing two or more separate axially parallel ducts, each duct having an external wall in common with the conduit, which wall is provided with axially spaced apertures for emission of water or air, there being no intercommunication between the ducts. The underdrain system itself also forms a feature of the invention.

Abstract: A juice processing module is provided in a raw juice stream to aid in the separation of the juice stream into clarified juice and pulpy juice. Raw juice is forced through directed orifices at a separating screen carried in a containment housing. Juice outlet ports are provided for the clarified juice and the pulpy juice.

Abstract: A filter device has a coffee-cartridge holder (11) constructed to receive a coffee cartridge (1) having two facing walls (2, 3) made of a filter material, one of said walls (2) being adapted to receive water (8) for making coffee. In order to prevent the foam formed during the extraction process from excessively influencing the extraction time, it is proposed to provide the coffee-cartridge holder (11) or the coffee cartridge (1) or both with means which ensure that, when the holder is in the operating position and containing the coffee cartridge, the wall (2) of a filter material to which water is supplied is inclined at an angle between 15 and 90 to the horizontal.

Abstract: A device for cleaning a swimming pool has a pair of spaced parallel and aligned wings connected at their ends by bridge members to define a mouth, a bag fast with the wings at their trailing edges, a hinged draw-bar centrally connected to the front sides of the bridge members, triangular fins extending from outer surfaces of the wings, and a connecting component for connection to a hose which supplied water under pressure, the connecting component being connected to the draw bar by a ball-and-socket joint and having two jets angled towards the draw-bar. The device is heavier than water and is such that when it sinks in water the wings pivot about the hinge of the draw bar so that their trailing edges are above their leading edges.

Abstract: A fluid filter and methods for manufacturing same are described. The fluid filter includes: a filter element; a plastic housing for the filter element; and a plastic closure member including fluid inlet holes, each having an axis which is angled outwardly relative to the longitudinal axis of the filter housing. The closure member and the housing can be connected by welding, or the housing and the closure member may include complementary interengageable locking means for engagement. One method of manufacture includes the steps of forming a plastic housing and closure member and spin welding them together. Another method includes the steps of: forming the housing and closure member with complementary interengageable locking members; aligning the locking members; and turning the housing to engage the housing and the closure member. With either method, the assembled filter is then spun onto a threaded stud on a filter mount.

Abstract: A disposable filter bag insert for use in a filter canister assembly that comprises a rigid ring of diameter to overlie a shoulder on the canister and be sealingly captured between the canister base and top. A filter stock of sheet stock construction is suspended from the ring and has a lock stitch extending along the bottom and one side edge thereof. A section of oil-adsorbent material is likewise suspended from the ring, but covers less than the entire surface area of the sock, such that fluid flow through the sock continues even if the oil-adsorbent material becomes clogged. The sock lock stitch is specially contoured where it is looped over the ring for enhanced sealing capture between the canister top and base.

Abstract: A disposable-filter holder comprises a shallow, box-shaped plastic housing of two pieces with intake and discharge stubs, a membrane-type filter being sandwiched between the two housing pieces which are joined together in a gas-tight and pressure-resistant manner. To reliably code the disposable-filter holder according to the filter characteristics, the disposable-filter holder comprises a colored coding plastic enveloping it in the outer radial zone. This color coding extends in at least one clearance in the first and/or in the second housing piece in geometrically locking manner and thereby does not project beyond the outer housing contour. The color coding only characterizes the disposable-filter holder and does not serve any sealing or locking function.

Abstract: A slit-tube filter has a hollow cylindrical filter element of bent wires which are attached to vertical retaining supports and form horizontal slits between themselves through which the liquid to be filtered passes, the cylindrical inner wall of the filter elements forming the filter surface adjacent the flow of liquid. The liquid flows from the inside of the filter element to the outside. A stripping device passes over the filter surface adjacent the flow of liquid, and bears against the inner wall of the cylinder. The stripping device is a coaxial helix of brushes which rotates in relation to the filter element in a direction such that the suspended and settleable solids disposed on and in front of the filter surface are conveyed downwards.

Abstract: A sieve bend has been described incorporating a headbox 40, throat mechanism 46, nip flap 90 and sieve surface area 52 supported by frame 96 which may have portions thereof rotated or positioned behind headbox 40 temporarily until its use is desired. The invention overcomes the problem of requiring frequent end for end reversal of the sieve surface area and of debris jamming the throat mechanism. Further, the invention permits in process variation of the sieve surface area 52 in response to downstream conditions.

Abstract: A filter for making filtered drinks, such as coffee, includes a filter bag and supporting members connected to the filter bag for supporting the filter on the rim of a vessel, such as a cup. The supporting members are adapted to be moved from a flat folded configuration to a position in which the supporting members are substantially horizontally oriented for being positioned on the rim of the cup.

Abstract: A filter element comprising porous hollow fiber filter membranes arranged in a lengthwise direction and fusion-bonded together at one or both of their respective end portions to form a unified terminal block which has through-holes communicating with the hollows of the remaining unbonded portions of the membranes and having diameters substantially the same as the inner diameters of the membranes. The filter element not only is excellent in resistance to heat and chemicals, but also can realize an efficient filtration.

Abstract: Process for the production of filters whose active filtering part is made up of a folded filter material web, preferably made from paper, which folded web is delimited in the process by side edges at which the folds terminate, and end edges at which a first or last fold is located, so that in this way filter units (49) are formed. The filter units (49) are produced in an automatized process in which the filter material web is creased and pushed together to form the folds. The spacings between the folds are maintained constant by means of a screw element with threads pushing down between the folds and forming spacing elements between these. The screw element is rotataed during forward movement of the folded web. Glue-coated strips are pressed onto the said side edges of the web, so that the ends of the folds are covered over by the strips.

Abstract: In rotating disc filters used for example in the pulp and paper industry, one or more spray elements are positioned between adjacent discs to rotate about an axis parallel to the disc axis. This arrangement achieves greater washing coverage of the discs than prior systems.

Abstract: Backflushing with internally mounted pistons and cylinders is provided in a pulp treating vertical vessel such as a paper pulp thickener, diffuser, or displacement bleacher. First and second sets of screens are mounted on a supporting arm/conduit within the vertical vessel, the first screens mounted directly to the arms and the second screens mounted on top of the first screens. A first cylinder is connected at one open end to the conduit and at the other open end is exposed to the pulp within the vessel. A second cylinder is mounted so that it is concentric with the first cylinder and both ends are in operative communication with the liquid conduit. A piston is mounted within each cylinder by a common vertically extending piston rod which connects them. The pistons and cylinders have different effective diameters.

Abstract: A filter arrangement is provided which includes preferred fluid sealing between a top plate thereof and a housing. Generally, the filter arrangement includes a housing, a top plate and an internal filter. The top plate encloses an end of the housing, retaining the filter therein and directing fluid flow appropriately across the filter. Engagement between the housing and the top plate is such that a gasket may be used to provide sealing of an operable combination of the filter arrangement with an associated filter head, with respect to flow space between the housing and top plate by means of a simple gasket position externally of the filter arrangement. Several embodiments have shown, and in at least one the housing edge terminates in a groove in the top plate, in which a sealing gasket may be positioned. Positive engagement between the top plate and the housing is provided by a variety of projection arrangements.

Abstract: Filter element, formed by a supporting body with a filtration part and a connecting part extending therefrom, in which the filtration part has the form of a flat ellipse or a flat rhomb, from which the connecting part gradually extends to a rounder shape, while over the supporting body a filter bag has been applied which at the open end has been fastened onto the connecting part by means of a clamp device.

Abstract: A filter leaf having a drainage member which is fabricated by combining a plurality of preforated and texturized sheets into a sandwich structure. The drainage member is covered in both sides by a pair of surface screens, and the entire assembly is secured together by a suitable frame.

Abstract: A filter of depth layer type comprises a generally cylindrical filter body formed by laminating filter elements each in the form of a thin sheet of a filtering material having a central hole, and these central holes provide a conduit extending in the axial direction through the filter body. The filter body has a density distribution in which the density is lowest at the outer peripheral area sewing as an inlet for a fluid to be filtered and becomes progressively higher toward the conduit to serving as an outlet for the fluid to be filtered.

Abstract: The cross flow filter method includes an open tank having a first liquid retaining section, a second filter retaining section and a third solids collecting section in fluid communication with each other. A filter assembly is retained within the second section and includes a filter panel having a generally vertically disposed porous media surface. Filtrate is removed by applying very low vacuum pressure in communication with the filter panel such that filtrate is drawn through the pores of the filter media surface at a flow rate Q.sub.out. Fluid to be filtered is simultaneously cross flowing vertically downward across the filter media surface at a flow rate Q.sub.x, such that the horizontal velocity V.sub.h of fluid drawn through the filter media surface is very slight with respect to the vertical velocity V.sub.v of the cross flowing unfiltered fluid.