Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1991-06-03
1993-06-08
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264 453, 264161, B29C 3700
Patent
active
052176630
ABSTRACT:
A method for molding a scrubbing sponge wherein raw materials are added a mold cavity having a bottom half and a top half having at least one cavity connected to a venting portion. The raw materials are foamed and expanded to pass through the cavity and vent until flashing is formed on the top of the mold. As the foam passes through the cavity and vent during the foaming cycle, it will become progressively denser as a result of the restrictive flow leading to the small opening of the vent.
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Cabot Safety Corporation
Kuhns Allan R.
Lando Michelle B.
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