Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1973-09-26
1976-07-20
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 53, 264101, 425812, 425817R, B29D 2700
Patent
active
039707326
ABSTRACT:
A method and apparatus for molding plastic materials, particularly foamed plastic materials, in which the materials are introduced into a mold cavity together with a foaming agent with the mold cavity being evacuated not later than immediately after the molding material is supplied thereto. The reduced pressure in the mold cavity causes the material to foam extremely quickly so as completely to fill the cavity while, at the same time, the mold is held closed by the pressure differential between the inside and outside thereof.
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Margedant, J. A. "Freon" - Blown Rigid Foams, DuPont Bulletins HR-31, July 1958, Wilmington, Del., E. I. DuPont de Nemours & Co., Inc., pp. 1-5.
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Overton David E.
Slaats Mathew A.
Anderson Philip
Crosby Melvin A.
Kimball International Inc.
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