Plastic injection mold

Details Plastic injection mold Plastic injection mold

2010-01-09

2011-11-08

Heitbrink, Timothy (Department: 1744)

Plastic article or earthenware shaping or treating: apparatus

With apparatus assembly or dismantling means or with idle part

For extrusion or injection type shaping means

C425S542000, C425S573000

Reexamination Certificate

active

08052410

ABSTRACT:
A plastic injection mold for molding a plastic article includes an upper insert and a lower insert. The upper insert and the lower insert match with each other to define an annular mold cavity in between. An annular gate communicates with the mold cavity to allow molten plastic material to flow into the mold cavity to mold the article. An annular runner is connected with the annular gate for injecting molten plastic material to the annular gate. Molten plastic material will evenly flow into the mold cavity of the plastic injection mold through the annular gate to mold the plastic article, which prevents the plastic article from being disfigured, decreasing the number of defective products and improving the product quality.

REFERENCES:
patent: 2799435 (1957-07-01), Abplanalp
patent: 4726925 (1988-02-01), Binder
patent: 2002/0167115 (2002-11-01), Tanaka
patent: 60-244516 (1985-12-01), None
Donald v. Rosato and Dominick v. Rosato, Injection Molding Handbook, 1995, Chapman & Hill, 2nd Edition, pp. 257-260.

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