Injection molding process operating without opening the mold to

Details Injection molding process operating without opening the mold to Injection molding process operating without opening the mold to

1989-05-22

1991-01-01

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264334, 264335, 425556, 425 73, B29C 4540

Patent

active

049816349

ABSTRACT:
An injection molding process creates a micro-cleanroom environment inside a mold cavity which can stay closed to airborne contaminants while ejecting and transferring the molded part out. The molded part is formed and solidified at a parting-line plane within the mold cavity, then is carried rearward on the movable mold insert to a second plane where it is stripped off and transferred out through a discharge aperture which is open when the mold cavity is in the second plane but closed off when in the first plane. The aperture faces substantially downward to prevent entry by upwelling thermal air currents. External supplied filtered gas can provide positive pressure through vents within the moldset's internal space. This maximizes mold and part cleanliness while speeding up "mold-open" cycle; may eliminate HEPA filters/enclosures and robots. Optical disks, lenses, food packaging and medical parts are suggested uses.

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Technical Article Entitled "Clean Room Molding: an Attractive Specialty", by D. Stover, in Plastics Machinery & Equipment Magazine, Feb. 1989, pp. 33-37.

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