DEVICE FOR FILTERING OF POLYMER MATERIAL MELT Russian patent published in 2003 - IPC

FIELD: process equipment for manufacture of products from plastic by extrusion or casting methods; applicable in polymer industry. SUBSTANCE: device has body, movable unit with changeable filter screens, system for moving of said unit by polymer melt being under extrusion pressure and adapter flanges. The latter serve for fastening of body to extruder and forming head to body. System for moving the unit with changeable filter screens includes cylinders with pistons installed on body two sides. Cylinders are connected with channels of adapter flange connected with forming head by means of channels with shutoff valves. Cylinders are provided with locking gate valves, and body, with removable plugs installed during replacement of filter screens. Adapter flanges, cylinders channels connecting cylinders with adapter flanges and shutoff valves are provided with heating members. Filter screen area exceeds that of cylinder cross-section. Distance between filter screens in moving unit is within 0.1D, where D is diameter of filtering surface of screen. EFFECT: improved design with replacement of filter screens without interruption of production process. 2 dwg