Injection molding flow control apparatus and method

Details Injection molding flow control apparatus and method Injection molding flow control apparatus and method

2011-03-08

2011-03-08

Heitbrink, Jill L (Department: 1743)

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

C264S328800, C425S564000

Reexamination Certificate

active

07901601

ABSTRACT:
Apparatus for controlling the rate of flow of fluid material through an injection molding flow channel leading to a mold cavity, the apparatus comprising:a pin having a longitudinal length being adapted for back and forth axial movement through the flow channel;the pin having a protrusion at a selected position along its length, the protrusion having an upstream end and a downstream end and a maximum diameter circumferential surface intermediate the upstream and downstream ends;the channel having an interior surface area portion which is complementary to the maximum diameter circumferential surface of the protrusion of the pin; andthe pin being slidable to a position within the channel such that the maximum diameter circumferential surface of the protrusion forms a seal with the complementary interior surface portion of the channel to stop flow of the fluid material.

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