A filtering device for high-viscous fluids having a two pistons being movably disposed in bores is disclosed. Each piston has at least one cavity and at least one filter element. The device also includes a displacing piston for generating fluid pressure and reversing the flow direction at the fluid during a back-flushing mode in an outlet channel or in a reservoir connected therewith.

A polymer melt candle filter having a support which comprises a hollow cylindrical body defined by a first end, a second end, and a cylinder wall having a first end portion and a second end portion. The first end portion includes a screw thread on its outside surface and optionally a hex fitting on its inside surface for receiving a hex wrench. The second end portion includes a plurality of holes in the cylinder wall. The area of the openings of the holes on the outside surface of the cylinder wall may be larger than the area of the openings of the corresponding holes on the inside surface of the cylinder wall. The shape of the openings of the holes on the outside surface may be non-circular. A polymer melt filter plate assembly which comprises (a) a support plate comprising a plurality of threaded holes; (b) at least one filter which is screwed into at least one of the threaded holes via the screw thread on the outside surface of the first end portion of the filter support; (c) a tie rod with (i) a first end extending through a hole in a cone insert and a cap located at the second end of the filter support, and (ii) a second end extending through a threaded hole in the support plate; and (d) a cross bar which is attached to the second end of the tie rod for holding the support plate inside a shaft of an apparatus for filtering a polymer melt.

The invention relates to a device and a method for filtering viscous or highly viscous liquids, in particular plastics melts, using an oscillating filter plate.

In one example, a filtering device has a housing that defines an inlet opening, first and second bores with first and second pistons therein, respectively, first and second inlet channels that extend from the inlet opening to the first and second bores, respectively first and second outlet channels in communication with the first and second bores, respectively, and a first backflush channel. The first piston defines a filter cavity in fluid communication with the first inlet and outlet channels when the first piston is in a production mode. The second piston defines a filter cavity in fluid communication with the second inlet and outlet channels when the second piston is in the production mode. The device has a backflush valve that compresses fluid into the filter cavity of the first piston via the first backflush channel to increase pressure in the cavity during a backflushing operation.

The invention relates to a device and a method for testing materials, and is characterized in that the device comprises application units (2) for interaction modules (1) and an exchange system for the interaction modules, and the device is designed such that the application units (2) automatically feed interaction modules (1) to the exchange system after a control signal and the exchange system is designed to feed the interaction modules to a test position.

A filtering device (100) for highly viscous media comprises at least one screen plug (10) which is movably arranged in a screen plug bore (27) of a housing (20) and which has at least one screen cavity (11, 12), a filter element (11.7) lying in said screen cavity. The screen cavity (11, 12) narrows to a funnel section (11.6) in a rear region when viewed in the flow direction, said funnel section opening into at least one screen plug outlet channel that opens upstream of the housing outlet channel (24, 25) in the production position. According to the invention, the screen plug outlet channel comprises an inlet zone (11.1, 11.2), at least one deflecting point (11.3), and an outlet zone (11.2, 12.2). The intake zone (11.1, 12.1) extends from an edge region of the funnel section (11.6), and the outlet zone (11.2, 12.2) is designed as a groove that extends on the outer face of the screen plug (10, 10) and/or on the inner face of the screen plug bore (27).

Filtration apparatuses and screen changer devices for filtering polymeric material as well as spacer plates, and face plates for the screen changer devices and related methods are shown and described herein.

A polymer melt candle filter having a support which comprises a hollow cylindrical body defined by a first end, a second end, and a cylinder wall having a first end portion and a second end portion. The first end portion includes a screw thread on its outside surface and optionally a hex fitting on its inside surface for receiving a hex wrench. The second end portion includes a plurality of holes in the cylinder wall. The area of the openings of the holes on the outside surface of the cylinder wall may be larger than the area of the openings of the corresponding holes on the inside surface of the cylinder wall. The shape of the openings of the holes on the outside surface may be non-circular. A polymer melt filter plate assembly which comprises (a) a support plate comprising a plurality of threaded holes; (b) at least one filter which is screwed into at least one of the threaded holes via the screw thread on the outside surface of the first end portion of the filter support; (c) a tie rod with (i) a first end extending through a hole in a cone insert and a cap located at the second end of the filter support, and (ii) a second end extending through a threaded hole in the support plate; and (d) a cross bar which is attached to the second end of the tie rod for holding the support plate inside a shaft of an apparatus for filtering a polymer melt.

The invention relates to a device (2) for filtering a liquid plastic, with a housing (4) with an inlet (6) for introducing the plastic and an outlet (8) for discharging the plastic, a screen carrier (12) accommodated in the housing (4) and having a screen chamber (10) for accommodating a filter element (14), a filter element (14) arranged in the screen chamber (10) of the screen carrier (12) and having a filter side (16) and a clean side (18), the filter element (14) being connectable to the inlet (6) and the outlet (8) in such a way that the plastic passes through and is filtered by the filter element (14) in a filtering flow direction (56) from the filter side (16) to the clean side (18) and wherein the filter element (14) can be cleaned by backwashing by plastic flowing counter to the filtering flow direction (56), a backwashing feed channel (20) fluidly connected to the clean side (18) of the filter element (14), which feed channel (20) is set up for this purpose, the filter element (14) against the direction of filtration flow (56), and a backwash discharge channel (22) which is fluid conductively connected to the filter side (16) of the filter element (14) and which is arranged to discharge the backwashed plastic after it has passed the filter element (14). According to the invention, a backwash screen support (24) fluidly connected to the backwash discharge channel (22) is proposed, comprising a screen chamber (26) for receiving a backwash filter element (28) and a backwash filter element (28) arranged in the screen chamber (26) and adapted to filter the backwashed plastic.

A filtering device for filtering a fluid, in particular a liquefied plastic, includes a housing having a receptacle for receiving a screen carrier and having a fluid inlet channel and a fluid outlet channel, a screen carrier movably received along a longitudinal axis inside the receptacle and having a screen carrier inlet, a screen carrier outlet and a cavity for receiving a filter element, wherein the cavity is in fluid communication with the screen carrier inlet and the screen carrier outlet, and the screen carrier can be moved from a screen replacement position via a venting position area into a filtering position. The screen carrier has a throttle recess which is arranged adjacent to the screen carrier outlet and is in fluid communication with the cavity, and which opens a variable flow cross-section between the cavity and the fluid outlet channel.