Screen changer with pre-fill screen blocks

Details Screen changer with pre-fill screen blocks Screen changer with pre-fill screen blocks

B - Operations, Transporting

29

F

18/742

B29F 3/00 (1980.01)

Patent

CA 1077665

Abstract of the Disclosure A screen changer mounted between a flowable plastic extruder and a die has a clamp frame movable rectilinearly across the extrusion passage by fluid piston and cylinder means to successively position one of four screen blocks across the passage. A used block is removable from the frame at one end, whereupon latch mechanism retains three blocks while the frame retracts to receive a fresh block. Each block contains a filter recess, a purge re- cess and a pre-fill groove in the upstream face, so that the incoming block is pre-filled with plastic and purged while moving into position across the passage.

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