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 recess and a pre-fill groove in the upstream face, so that the incoming block is pre-filled with plastic and purged wh...
A screen changer for removing foreign matter from a flowable plastic advancing along a possage of an extruder, said screen changer being of the type having a plurality of screen blocks movable end-to-end along a rectilinear slideway, extending across said passage, by drive means to position said blocks individually and successively in operative screening position across said passageway and characterised by: each said screen block having a planar rim encompassing a shallow filter recess, for receiving a filter, in the upstream face thereof, said filter co...
이 특허를 인용한 특허 피인용횟수: 15
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