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US 4,213,814 AGranted
Insulation plate formation
AssigneeUniroyal, Inc.
InventorsLambert Pasch, Heinz Wagemann
Life of this patent
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AssigneeUniroyal, Inc.
InventorsLambert Pasch, Heinz Wagemann
Estimating the term…
A method and apparatus for molding elastomeric stock, the method comprising interposing an apertured, heat-resistant, flexible, insulation plate between a heated mold and the discharge portion of an elastomeric stock injection unit such that respective mold cavities provided in the mold are aligned with respective apertures in the insulation plate which intercommunicate the mold cavities with an internal discharge chamber in the injection unit. The mold and injection unit are moved relative to one another such that each presses against the other through the intermediary of the insulation plate, thereby permitting expulsion and transferring of a portion of elastomeric stock from the injection unit into the mold cavities to be cured, an excess portion of elastomeric stock remaining in the injection unit being prevented from undergoing curing by means of the presence of the insulation plate.
A method of fabricating an insulation plate to be interpositioned between an elastomeric stock injection unit and a heated mold having inlet apertures for elastomeric stock;
A method of fabricating an apertured insulation plate, comprising forming an at least partially uncured body of substantially uniform thickness from a thermally insulatory material constituted of a mixture of flexible fibers and a thermosetting resin, interposing said body between the mutually confronting and engageable surfaces of an injection unit and a mold having at least one cavity such that at least the uncured portion of said body is engageable with said mold, affixing said body to said injection unit in the latter condition, pressing said mold and injection unit against said body while heating said mold to a temperature corresponding to the curing temperature of said body to thereby form cured impressions in the surface of said body which confronts said mold corresponding to and mating with impressions in the surface of said mold pressing thereagainst, withdrawing said mold and injection unit from one another to make accessible and expose the surface of said body formed with said cured impressions, and forming at least one aperture in said body in axial alignment with a corresponding mold cavity defined by one of said cured impressions to thereby intercommunicate said cavity with a chamber defined in said injection unit.
Dependencies are inferred from the claim text.