Elastic molding die

Details Elastic molding die Elastic molding die

1992-06-18

1994-07-26

Woo, Jay H.

Static molds

Including coating or adherent layer

Parting layer

249127, 249134, 264313, 264314, 425438, 425440, 425DIG14, 425DIG44, A23G 121, B28B 734, B29C 3350

Patent

active

053321901

ABSTRACT:
An elastic molding die is composed of an elastomer laminate film, of which the innermost layer is formed of an elastomer not containing fillers. The innermost layer elastomer is preferably an oil-resistant elastomer. Alternatively, an oil-repellent agent may be contained in the innermost layer elastomer. The outer layer may be formed of an elastomer containing fillers. Furthermore, an oil blocking layer can be provided between the inner layer and the outer layer. A master model is dipped in an elastomer solution not containing fillers, heat dried to form a gelled elastomer film, the film is coated with a coagulant, dipped again in an elastomer solution, taken out, gelation treated, and the elastomer film is peeled from the master model to obtain an elastic molding die. In another method, a once-formed hollow elastic molding die is turned inside out, pressed in with a gas to swell, the swollen die is coated with an elastomer solution not containing fillers, heat dried, and turned it again inside out.

REFERENCES:
patent: 3427689 (1969-02-01), Windecker
patent: 3539144 (1970-11-01), Krug
patent: 3671007 (1972-06-01), Bailey et al.
patent: 5154937 (1992-10-01), Fujishima
patent: 5207965 (1993-05-01), Komine et al.

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