Patent ID: 7438550

Claim:
A material processing plant, comprising: a first extruder; a second extruder downstream of the first extruder, one of the first and second extruder being disposed above one of the second and first extruder; and a delivery zone which connects the first extruder to the second extruder; wherein a function casing is disposed in the delivery zone, having a second overflow passage of a diameter D 2 which runs in a direction of flow, said function casing having a function element disposed in said second overflow passage, said function element being one of a sieve and a supporting plate and a static mixer and a filter and a strainer plate, said function casing being displaceable on rails via a slide drive, said slide drive having a direction of action which is parallel to said rails, said function casing being displaceable via said slide drive substantially to the side of the direction of flow out of a position of operation in the delivery zone in a push-out direction, said push-out direction being parallel to said direction of action and said rails extending in said push-out direction, said function casing expanding in the shape of a wedge in the push-out direction; and wherein the second overflow passage of the function casing is connected to the first extruder by means of a first overflow passage of a diameter D 1 , and the second extruder by means of a third overflow passage of a diameter D 3 , wherein D 1 ≦D 2 ≦D 3 , said function casing comprising a first contact surface and a second contact surface, wherein at least one of the first contact surface and the second contact surface extend one towards the other in the shape of a wedge, said first contact surface contacting a first overflow passage contact surface in said position of operation, said second contact surface contacting a third overflow passage contact surface in said position of operation, wherein packings are disposed in one of said second contact surface and said third overflow passage contact surface, one of said third overflow passage contact surface and said second contact surface being lifted off said packings when said function casing is moved in said push-out direction, said second contact surface and said third overflow passage contact surface extending perpendicular to said direction of flow, said rails being inclined with respect to said second contact surface and said third overflow passage contact surface.