On a rotary screen filtering device for medium to high-viscosity fluids, which comprises a rotary screen mounted for rotation in a housing, which screen has at least one screen element through which fluid can flow, the rotary screen, in the region of its sealing faces and the intermediate plates are fabricated or machined together so that they are of identical height. A gap width compensation layer is then inserted between the inlet plate and the intermediate plate and/or between the outlet plate and the intermediate plate. The package of plates is then pretensioned by means of screw bolts in such a manner that all the plates lie firmly against one another up to a maximum permissible operating pressure. Lubrication gaps of defined width are created between the sealing faces and the opposing inner faces of the inlet and outlet plates.

A filtering device for highly viscous media, in which filtering device a rotatably mounted screening wheel which has a plurality of screening cavities is arranged between a front housing element and a rear housing element. According to the invention, a plurality of screening cavities lying beside one another, through which flow can pass jointly, are combined into at least one filter group. To this end, on both sides beside the filter group, a closed blocking segment is provided on the screening wheel which segment, when positioned in associated blocking regions of the housing, is sealed off with respect to the housing elements on both sides of the screening wheel. The blocking regions in the housing are in each case larger than or as large as a screening cavity together with a sealing web surrounding the same.

An automatic screen changer device for use on systems and equipments for the manufacturing, processing, recycling and treatment of thermoplastic materials, is placed downstream of an extruder device and includes a frame (12), two opposite side plates or shoulders secured to the frame and provided, respectively, with an inlet opening (18) and a pair of inlet channels (30), with an outlet opening (20) and with a pair of outlet channels (32), the inlet channels allowing a flow and a screening of contaminated molten material in the direction of the outlet channels through a pair of stacked screening units; the device likewise includes movable sealing and locking/unlocking elements of a screening support or band for the screening of the molten material in each screening unit with the latter movable reciprocally with temporary interruption of the flow of molten material through one of the same screening units during the screen change.

A method and an apparatus for operating a screening wheel filter for high-viscosity melts with pressures of >10 bar and temperatures of >90 C., wherein a screening wheel (1) is rotationally driven step by step, and screening inserts (2) arranged in the screening wheel (1) are successively subjected to a stream of cleaning agent produced by a cleaning agent drive (9) in a backflushing cleaning station, are to be optimized in such a way that less cleaning agent is used, better cleaning of the screening inserts takes place and a saving of energy is ensured. For this purpose it is proposed that the cleaning backflushing in the backflushing cleaning station takes place during the rotation of the screening wheel (1), wherein an open-loop or closed-loop control device (7) assigned to the cleaning agent drive (9) is used to set the amount of cleaning agent and/or the pressure of the cleaning agent and/or the flow rate of the cleaning agent in dependence on the rotational speed of the screening wheel (1) and/or in dependence on a differential pressure prevailing at the screening inserts (2) located in the melt channel (4) and the effective opening of the slot die normal to the radial is less than the distance covered by the screening wheel (1) during a driving step.

A filter device for PVC plastic melt, for connection to a twin screw extruder. A housing has at least an inlet block with at least one inlet channel, and an outlet block with at least one outlet channel. At least one spacer element is arranged between the inlet block and the outlet block. A screen wheel is rotatably mounted in the housing. A plurality of screen points are each positioned between the inlet channel and the outlet channel and in each of which at least one screen element through which plastic melt can flow can be inserted. A drive device rotates the screen wheel in the housing. The inlet channel is formed in an inlet melt pocket in the inlet block, which has a twin extruder screw receptacle for two screw tips of two extruder screws to be arranged next to one another.

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 screen wheel filter device is provided for the high-pressure filtration of a plastic melt. At least one spacing element is arranged between an inlet plate and an outlet plate and a bearing ring on which a screen wheel arranged between the inlet plate and the outlet plate, is rotatably mounted. A tensioning bolt is guided through the bearing ring and via which the inlet plate together with the outlet plate, including the bearing ring inserted therebetween, is braced. The screen wheel has a plurality of screen segments which can each be positioned between the inlet channel and the outlet channel and through each of which a flow can pass. A throughflow region is formed between the opening in the inlet channel and the opening in the outlet channel facing toward the screen wheel in each case.

The present invention relates to a filtering device for fluids, in particular thermoplastics, comprising a screen carrier (2) which has a rotationally cylindrical outer face (41) and is mounted rotatably in a rotationally cylindrical recess (5), adapted to its circumference, of a stationary housing (3) and in which a number of screening nests (6) having filter arrangements (7) are formed along its circumference. According to the invention, there is provision whereby the screen carrier (2) is penetrated by a rotationally cylindrical core part (1) and is mounted rotatably on this, the core part (1) and the housing (3) being designed to be stationary and fixed in terms of rotation with respect to the rotatable screen carrier (2).

The invention relates to a dirt precipitator (100) for a highly viscous medium, having a housing comprising a front housing element (30; 30) that comprises at least one inlet channel (33) and a rear housing element (20) that comprises at least one outlet channel (23), and having a screen wheel (10; 10) rotatably mounted between the housing elements (20, 30; 30) having a number n of screen positions disposed in a ring zone, on each of which at least one screen opening (11.1, . . . , 11.12) having at least one screen insert element is provided. The inlet channel (33), the outlet channel (23), and the screen opening (11.1, . . . , 11.12) are disposed flush one after the other in at least one working position and form a flow channel. In all positions of the screen wheel (10; 10), more than 50% of the screen openings (11.1, . . . , 11.12) are always able to be permeated, and are impinged by flow from at least one inlet channel and from which at least one outlet channel leads.