Static molds – Including means within surface to confine heat exchange medium – Mold part of particular material
Patent
1976-04-15
1977-12-20
Spicer, Jr., Robert L.
Static molds
Including means within surface to confine heat exchange medium
Mold part of particular material
249116, 425388, 425DIG60, 204 6, 156150, B29C 100
Patent
active
040637050
ABSTRACT:
A mold for vacuum forming plastic sheet and the like and a method of making the mold. A relatively thin mold shell provides a forming surface through which small apertures open to exhaust air to vacuum form a heat-softened plastic sheet. Small manifold conduits behind the forming surface connect the apertures to a source of vacuum. The mold area subtended by the manifold conduits is substantially less than the area of the entire forming surface, thereby substantially limiting the force exerted upon the forming surface by the pressure differential created during vacuum forming of a plastic sheet. The mold is preferably made by electroforming a metallic shell on a pattern, and is apertured in a desired pattern. Filaments are advantageously used to form the apertures during electroforming. A low melting point material is applied to the back of the shell in a manifold pattern to connect the apertures and a metallic layer is electroformed to the back of the shell. The material forming the manifold pattern is then melted and removed.
REFERENCES:
patent: 3503856 (1970-03-01), Blackmore
patent: 3640666 (1972-02-01), Jope et al.
patent: 3687594 (1972-08-01), Medendorp
patent: 3753830 (1973-08-01), Cruckshank et al.
patent: 3942934 (1976-03-01), Momiyama
patent: 3947206 (1976-03-01), De Ligt et al.
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