Screen changer with pre-fill screen blocks

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

1975-10-06

1977-05-24

Hart, Charles N.

Liquid purification or separation

With repair or assembling means

Sliding or rolling on guide means

210447, 210455, 425197, B01D 2700

Patent

active

040254348

ABSTRACT:
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 while moving into position across the passage.

REFERENCES:
patent: 2786504 (1957-03-01), Samler
patent: 3455357 (1969-07-01), Zink
patent: 3653419 (1972-04-01), Schutter
patent: 3804758 (1974-04-01), Cooper et al.
patent: 3856680 (1974-12-01), Elmore
patent: 3900399 (1975-08-01), Kreyenborg et al.

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