Method of releasing an inner mold from a rubbery elastic molding

Details Method of releasing an inner mold from a rubbery elastic molding Method of releasing an inner mold from a rubbery elastic molding

1985-12-12

1986-11-04

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 63, 249 66C, 264318, 425437, B29C 4142

Patent

active

046209590

ABSTRACT:
A method of releasing an inner mold from a rubbery elastic molding having a corrugation in its inner longitudinal cavity and adapted suitably for, but not limited to, use in an electrical bushing or electrical insulator, which method comprises steps: forming a partial space connecting to a pressure source at an interface between the molding and the inner mold; supplying a pressure medium such as a gas or a liquid from the pressure source into the interface via said space to form a desired space between the molding and the inner mold over its entire zone and to expand the inner cavity of the molding; and releasing the inner mold from the molding.

REFERENCES:
patent: 2361026 (1944-10-01), Greene
patent: 4364895 (1982-12-01), Underwood
patent: 4375948 (1983-03-01), Von Holdt

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