Apparatus for molding two-tone colored plastic shells

Details Apparatus for molding two-tone colored plastic shells Apparatus for molding two-tone colored plastic shells

1989-05-22

1990-05-15

Thurlow, Jeffery

Static molds

Having inflatable element

249160, 249168, 264245, 264310, 264DIG60, 425425, 425434, 425435, 425DIG47, B29C 4104, B29C 4122

Patent

active

049251511

ABSTRACT:
Apparatus for manufacturing thin-walled hollow shells for parts such as automobile door panels, control and instrument panels and the like includes a charge box or powder box for supplying dry thermoplastic material to separate casting surfaces on a heated mold selectively connected to the charge box during a casting process. A selectively pressurizable inflatable seal gasket is connected to the charge box for sealing a division surface on the heated mold which surface separates the casting surfaces of the mold. The inflatable seal gasket includes a base portion fixed to the charge box; an inflatable core with expandable walls to bridge the distance between the charge box and the division surface and a seal bead that sealingly engages the division surface when the seal gasket is inflated to keep the division surface clean for a subsequent application of material to form a connector bond between previously cast two tone colored segments.

REFERENCES:
patent: 2841823 (1958-07-01), Van Hartesveldt
patent: 2939299 (1960-06-01), Sherbloom
patent: 3123403 (1964-03-01), Hood
patent: 3999930 (1976-12-01), Telbizoff
patent: 4562025 (1985-12-01), Gray
patent: 4610620 (1986-09-01), Gray
patent: 4623503 (1986-11-01), Anestis et al.
patent: 4724113 (1988-02-01), Lee
patent: 4783302 (1988-11-01), Kurimoto

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