Injection molding filter

Details Injection molding filter Injection molding filter

1990-01-10

1991-11-05

Dawson, Robert A.

Liquid purification or separation

With repair or assembling means

210446, 210447, 210448, 425197, B01D 2911

Patent

active

050629522

ABSTRACT:
Apparatus is disclosed for filtering melted plastic used in an injection molding system. The apparatus consists of a housing having an inlet and outlet with a cylindrical inner chamber disposed in alignment therebetween, and a tubular filter element threadably mounted in the internal housing. To avoid loosening of the filter element, a plurality of spiral surfaces are formed in the filter element that are exposed to the pressurized flow of melted plastic, generating a resultant force that tends to screw the filter element tighter onto its threaded mount. The threaded mount is at the inlet end of the tubular element, causing it to extend in cantilever fashion axially into the internal chamber and toward the outlet. This creates an annular discharge passage around the filter element that is unobstructed, permitting the filtered plastic to converge smoothly into the outlet.

REFERENCES:
patent: 2607954 (1952-08-01), Schneider et al.
patent: 3737506 (1973-06-01), Martin et al.
patent: 3767056 (1973-10-01), Neuman
patent: 4204961 (1980-05-01), Cusata, Jr.
patent: 4217083 (1980-08-01), Machuque
patent: 4434053 (1984-02-01), Osuna-Diaz
patent: 4477352 (1984-10-01), Pappas
patent: 4597870 (1986-07-01), Lambertus
patent: 4627916 (1986-12-01), Dorsam

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