Filter-changing method for a molten plastic filtration apparatus

Details Filter-changing method for a molten plastic filtration apparatus Filter-changing method for a molten plastic filtration apparatus

1994-08-03

1995-04-18

Spear, Frank

Liquid purification or separation

Processes

Separating

210790, 210330, 425186, 425198, 425199, B01D 3300, B29C 4768, B29B 1310

Patent

active

054075866

ABSTRACT:
A filter assembly used in combination with an extruder producing a stream of pressurized molten plastic has an inlet plate formed with a Y-shaped inlet passage having a substantially circular-section upstream end adapted to receive the stream of pressurized molten plastic from the extruder. The inlet passage branches downstream of its upstream end and has a pair of downstream ends opening at substantially circular downstream ports. An outlet plate fixed immediately downstream of the inlet plate is formed with a Y-shaped outlet passage having a substantially circular-section downstream end. The outlet passage is branched symmetrically to the inlet passage upstream of its downstream end and has a pair of upstream ends opening at substantially circular upstream ports aligned with the downstream ports. A rotatable filter disk engaged between the plates is formed with a circularly annular array of substantially circular-section throughgoing holes each defining a respective substantially circular seat. The ports and holes are laterally spaced from each other such that in predetermined positions of the disk the ports open into two adjacent holes. A drive displaces the disk between respective angularly offset positions in each of which two of the holes are aligned between the ports for flow through them from the upstream ports to the downstream ports. A respective substantially circular filter unit is provided in each of the seats.

REFERENCES:
patent: 3503096 (1970-03-01), Marianelli
patent: 4167384 (1979-09-01), Shirato et al.
patent: 4588502 (1986-05-01), Zibell et al.
patent: 4710288 (1987-12-01), Patrovsky
patent: 4814186 (1989-03-01), Trott
patent: 4850840 (1989-07-01), Gneuss
patent: 5090887 (1992-02-01), Gneuss

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