Molding process for forming a sealing gasket on filter media

Details Molding process for forming a sealing gasket on filter media Molding process for forming a sealing gasket on filter media

1995-11-29

1997-08-26

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 469, 264252, 264276, 264DIG48, 425812, B29C 4406, B29C 4412

Patent

active

056607717

ABSTRACT:
In order to prevent the formation of flash on a gasket used to seal a filter element when the filter element is mounted in a housing to filter a fluid, such as air for an internal combustion engine, a molding method and apparatus utilizes a pair of mold components which abut along a mold line and define a cavity for forming the gasket. As the expandable material expands to fill the cavity and form the gasket, a portion of the material adjacent the mold line is received in an annular groove in one of the mold components so that flash is not formed at the mold line. One of the mold components also has an upwardly sloping ramp surface so that air and gas move along the ramp surface as the material expands and does not become trapped in the cavity, thus avoiding defects and blemishes in the gasket due to trapped air bubbles.

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