Compression mold with vacuum seal

Details Compression mold with vacuum seal Compression mold with vacuum seal

1993-09-29

1994-12-06

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Means to create a vacuum or apply fluid pressure within a...

425DIG60, 264102, B29C 4356

Patent

active

053705211

ABSTRACT:
A simple yet reliable sealing assembly for a vacuum compression mold. Molding apparatus for compression molding a charge under vacuum includes an upper die having a molding surface and outer side walls. A lower die has a complimentary molding surface and side walls substantially aligned with the side walls of the upper die. A heat source heats the upper and lower dies. A sealing assembly includes a seal plate on each side wall of the upper die. Upper portions of the seal plates are fixed and sealed to the upper die. Lower portions of the seal plates extend downwardly therefrom. The sealing assembly includes flexible sealing tubes on lower portions of the plates. A distance between upper and lower edges of the seal plates is related to a height of the charge to be molded. A moving device moves the upper die towards the lower die to a partially closed position where the tubes of the sealing assembly engage side walls of the lower die to thereby create a vacuum chamber. A vacuum source creates a vacuum in the vacuum chamber. The dies thereafter are fully closed to cause the charge to flow in the mold cavity defined by the molding surfaces of the upper and lower dies. The apparatus thereby provides the relatively simple and cost effective apparatus for compression molding parts under vacuum.

REFERENCES:
patent: 2841823 (1958-07-01), Van Hartesueldt
patent: 3840239 (1974-10-01), Fazekas et al.
patent: 4551085 (1985-11-01), Epel et al.
patent: 4597929 (1986-07-01), Blayne
patent: 4867924 (1989-09-01), Schilkey et al.
patent: 5130071 (1992-07-01), Iseler et al.
Owens Corning Fiberglass paper entitled "Reducing SMC Porosity--Studies Show It Can Be Done", 6 pages.
Gorsuch et al, The General Tire & Rubber Company, "Surface Porosity and Smoothness of SMC, Molding as Affected by Vacuum and Other Molding Variables", 1978, 7 pages.

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