Synthetic resin injection molding assembly

Details Synthetic resin injection molding assembly Synthetic resin injection molding assembly

2006-08-26

2009-02-03

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

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

With means to heat or cool

C425S548000, C425S552000

Reexamination Certificate

active

07484953

ABSTRACT:
A synthetic resin molding mold assembly, is provided for rapidly heating a cavity surface without suffering from any temperature variation in the cavity surface when a temperature of the cavity surface increases; this condition is not affected by a contour of the cavity surface; and, may prevent any weld line from occurring without prolonging a molding cycle time. A mold insert is employed that is divided into an insert front piece with the cavity surface and an insert rear piece without the cavity surface. A fluid passage is formed to pass through the front piece in the vicinity of the cavity surface and extends from a rear surface of the rear piece to pass there-through toward the cavity surface, receives an electric heater therein, and is then closed with the rear piece to dispose the heater in a deepest portion of the fluid passage.

REFERENCES:
patent: 5423670 (1995-06-01), Hamel
patent: 6019931 (2000-02-01), Kashiwagi
patent: 2003-181838 (2003-07-01), None
patent: 2004-249640 (2004-09-01), None

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