Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1997-10-31
1999-12-07
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264276, 425812, B29C 4402
Patent
active
059977833
ABSTRACT:
A vent for a mold for producing foamed articles is described. The mold comprises an upper mold and a lower mold releaseably engageable in a closed position to define a mold cavity. The vent comprises a housing which is engageable to the mold, a passageway and an obstruction disposed in the passageway. The passageway and the obstruction are slidably movable in a first direction with respect to one another and define an opening between an interior and an exterior of the housing. The obstruction has a varying diameter in a direction parallel to the first direction. The subject mold and method are particularly well suited for the production of molded foam (e.g., polyurethane) articles.
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Balbaa Hassan
Hunter Craig A.
Kuhns Allan R.
Woodbridge Foam Corporation
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