A filtering device for removing dirt particles and contaminants from a plastic melt is disclosed. The filtering device includes a housing having a filter chamber, an inlet for feeding plastic melt, an outlet for channeling plastic melt out, and a dirt outlet for discharging dirt particles from the housing. The filtering device also includes a filter element arranged in the filter chamber to retain any dirt particles contained in the stream of melt, and a cleaning unit for cleaning the filter element of dirt particles retained by means of the filter element. The cleaning unit having a cleaning head with a scraper member for detaching dirt particles from the filter element. The scraper member is coupled to a servomechanism to press the scraper member onto the surface of the filter element. The servomechanism has at least one bellows cylinder including a foot section, a head section, a deformable bellows element, and a pressure chamber of variable volume.

A device is provided that provides an unbiased filtration effect and an effect of removing captured substances through backwashing by causing a fluid to uniformly pass through a filter element over the entire length in an axial direction at the time of backwashing so as to efficiently rotate a captured-substance removal tool in a filtration unit 1 which includes the captured-substance removal tool 20 axially supported inside the tubular filter element 2 to be rotatable.

Provided is a wash press that separates liquids and solids from a waste stream. The wash press includes a tank having a semi-cylindrical shape. The tank has an inlet at a top of the tank for receiving a waste stream, a screen disposed in a portion of a bottom of the tank to permit liquid to pass therethrough, and an outlet for permitting solid materials separated from the liquid to pass therethrough. A rotor extends through the tank for transporting and dewatering the waste material entering the tank. The rotor includes a plurality of helical flights interconnected by paddle members to permit agitating the waste material. The wash press also includes a removable cover that enables the rotor to be lifted vertically, and a removably attached screen to facilitate replacement/repair of the same.

A reciprocating lamination spiral solid-liquid separator is provided, including: a support frame, a filter chamber, a spiral shaft and a driving device. The filter chamber is assembled with the support frame. The spiral shaft is mounted on the support frame and passes through the filter chamber. The driving device is mounted on the support frame. Two ends of the filter chamber respectively have a feed port and a discharge channel. The filter chamber includes a first closed movable ring-piece assembly and a second closed ring-piece assembly having a motion state that is inconsistent with that of the first closed movable ring-piece assembly. The first and second closed ring-piece assemblies are stacked alternately to form the filter chamber, and a gasket is disposed between two adjacent closed ring-pieces of one of the closed ring-piece assemblies.

A washing pipe is mounted on a washing guide provided on an outer side of an outer cylinder screen of the screw press and includes a washing pipe body and washing nozzles provided in the washing pipe body and configured to discharge washing liquid flowing from an inside of the washing pipe body toward the outer cylinder screen. A washing pipe swing supporter is configured to support the washing guide to allow the washing pipe to swing between a discharge position and a separation position. The discharge position is a position where the washing pipe is mounted on the washing guide and the washing liquid is discharged from the washing nozzles toward the outer cylinder screen. The separation position is a position where the washing nozzles are farther away from the outer cylinder screen than in a state where the washing pipe is positioned at the discharge position.

Various implementations include a self-cleaning screen device including a screen and auger. The screen is a hollow cylinder and has a screen central axis, a screen inner surface, a screen outer surface opposite and radially spaced apart from the screen inner surface, a screen first end, and a screen second end opposite and axially spaced apart from the screen first end. The screen outer surface defines a plurality of openings extending radially to the screen inner surface. The auger is helically shaped and has an auger central axis, an auger first end, and an auger second end opposite and axially spaced apart from the auger first end. The auger is disposed around at least a portion of the screen outer surface such that the auger central axis and the screen central axis are coincident with each other. The auger is rotatable about the auger central axis relative to the screen.

An assembly (1) for filtering water comprising: a filter (10) forming a permeable receptacle for fluid to be filtered, an actuating inlet (300) for providing a stream of water, a filter fluid inlet (302) for providing fluid to be filtered to the filter (10), and, a rotatable cleaning structure (20) for cleaning the filter (10), wherein the structure (20) comprises at least one scraper (201) extending along and substantially abutting a first surface (101) of the filter (10), the scraper (201) being rotatable with respect to the first surface (101) of the filter (10), and wherein the structure (20) further comprises at least one rotatable element (250) arranged for receiving the stream of water, the stream of water being receivable in, and filterable by, the filter (10) and wherein the element (250) is rotationally engaged with the scraper (201) such that the stream of water providing a rotational force to the element (250), rotates the scraper (201) with respect to the first surface (101) of the filter.

Disclosed are methods for concentrating solids and removing solids from a filter medium. The method includes the step of concentrating first particles of a first solid by removing a fluid stream through a filter medium in a filter. At least some of the first particles become blocking particles that block pores of the filter medium. The method also includes the step of inserting second particles of a second solid into the filter. These second particles scrape, vibrate, agglomerate, or a combination thereof along the filter medium, thus dislodging at least a portion of the blocking particles.

A method for producing a screen body for a screen used in a screw press, which screen body comprises one or more openings on a screen surface. In order to achieve a particularly long service life, it is provided that the screen body is formed by a sintering process and/or an additive manufacturing process, in particular a 31) printing process. Further embodiments include a screen, in particular for a screw press, having a screen body Which has openings on a screen surface.

A filtering system (10) includes a casing (12) internally defining a cavity (14) and has an inlet (16) configured to receive a fluid and leading into the cavity (14), and an outlet (18) configured to deliver the fluid coming from the cavity (14). A filtering assembly (100) is contained in the cavity (14) and is configured to be crossed by the fluid entering the casing (12) through the inlet (16), so as to trap any solid particles, in particular microplastic ones, contained in the fluid. A compacting assembly (200) situated in the cavity (14) is configured for collecting and compacting the solid particles trapped by the filtering assembly (100). A driving assembly (300) is configured to drive the compacting assembly (200).