Sprue bar shutoff method

Details Sprue bar shutoff method Sprue bar shutoff method

2010-02-09

2010-12-14

Heitbrink, Jill L (Department: 1791)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C264S328110

Reexamination Certificate

active

07850895

ABSTRACT:
A method for connecting and disconnecting an injection molding machine to and from a shutoff assembly includes the steps of mating a nozzle of the injection molding machine to a seat in an exterior wall of a chamber of the shutoff assembly, advancing an elongate stem through a first opening into the chamber, and flowing molten polymer into the chamber and out a second opening in the chamber and on to a mold or sprue bar. The mold may be decompressed by maintaining a movable body disposed in the chamber in a forward position with the elongate stem and allowing the molten polymer to flow out the first opening. The injection molding machine may be disconnected from the shutoff assembly by withdrawing the stem of the nozzle from the chamber through the first opening, allowing molten polymer downstream of the movable body to push the movable body into engagement with a sealing surface of a interior entry wall of the chamber, and disconnecting the nozzle from the seat.

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Plastic Process Equipment, Inc., 6 Stock Screw Tip Styles, downloaded from www.ppe.com/09cat/0852-0853.pdf on Jan. 30, 2009.

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