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.

Provided herein are metal organic framework/polymer mixed-matrix hollow fiber membranes and metal organic framework/carbon molecular sieve mixed-matrix hollow fiber membranes. The materials have high MOF particle loading and are easily scalable. The MOF/polymer mixed-matrix hollow fibers are formed using a dry-jet/wet-quench fiber spinning technique and show C.sub.3H.sub.6/C.sub.3H.sub.8 selectivity that is significantly enhanced over the pure polymer fiber and that is consistent with the selectivity of mixed-matrix dense films of the same MOF/polymer combination. The MOF/CMS mixed-matrix hollow fibers are formed by pyrolyzing the MOF/polymer mixed-matrix hollow fibers and show increased C.sub.3H.sub.6 permeance and increased selectivity over the MOF/polymer mixed-matrix hollow fiber membranes.

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.

The invention relates to an extruder for processing pulverulent bulk material, in which at least one housing portion, which accommodates a filter element (5) located on a support frame (4), is configured in a feed region. According to the invention, the filter element (5) is formed from interconnected layers of sintered metal wire mesh screens, the filter element (5) containing at least one protective layer (27) which is directed against the screw and has a mesh size of 20-100 m, a filter layer (28) having a mesh size of <1 m, and a rear support layer, and the protective layer (27) being located at a safety distance of 0.5-2 mm from the outer diameter of the screw. The filter element (5) can be removed from the housing portion with the aid of the support frame (4) and is self-supporting and dimensionally stable.