Injection molding apparatus operating without opening the mold t

Details Injection molding apparatus operating without opening the mold t Injection molding apparatus operating without opening the mold t

1990-09-20

1992-08-25

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With product ejector

425437, 425DIG102, B29C 4540

Patent

active

051414309

ABSTRACT:
An injection molding apparatus 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 and may eliminate HEPA filters/enclosures and robots. Optical disks, lenses, food packaging and medical parts are suggested uses.

REFERENCES:
patent: 4085178 (1978-04-01), McNeely et al.
patent: 4118168 (1978-10-01), Rees et al.
patent: 4715806 (1987-12-01), Ehrler et al.
patent: 4981634 (1991-01-01), Maus et al.

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