Compression molding a charge using vacuum

Details Compression molding a charge using vacuum Compression molding a charge using vacuum

1984-08-13

1986-09-16

Golian, Joseph

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

264263, 264320, 264325, 264DIG64, B29C 4356

Patent

active

046121498

ABSTRACT:
A method is disclosed for making a part with a smooth surface, such as an exterior automotive body panel, by compression molding a charge containing a curable resin. The charge is placed on the molding surface of one of the dies so that the charge covers 40%-80% of the surface area of the molding surface. The molds are moved to a partially closed position and the mold cavity is quickly evacuated. The mold is then closed so that the dies compress the charge to cause it to fill the mold cavity and, after the resin cures, the part is removed from the mold.

REFERENCES:
patent: 3840239 (1974-10-01), Fazekas et al.
patent: 4488862 (1984-12-01), Epel et al.
J. D. Gorsuch et al, "Surface Porosity and Smoothness of SMC Molding as Affected by Vacuum and Other Molding Variables", 33rd Annual Technical Conference, 1978, Reinforced Plastics/Composites Institute; The Society of the Plastics Industry, Inc., Section 9-F, pp. 1-7.

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