Injection molding system with sequential gate control

Details Injection molding system with sequential gate control Injection molding system with sequential gate control

1998-10-16

2000-08-08

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 407, 2642972, 2643288, 425145, 425570, 425572, 425588, B29C 4522

Patent

active

060997672

ABSTRACT:
An injection molding machine [10] for molding plastic parts by injecting a molten plastic through a plurality of valve gates [31] into a mold cavity by reciprocation of a helical screw [16]. A linear position sensor [34] positioned on the machine to detect the position of the helical screw [16] and control the opening and closing of the gates [31] based on the detected position of the screw [16]. A computer is in communication with the valve gates and the position sensor to monitor the position and activate the opening and closing of the valve gates [31]. A pressure transducer is associated with the mold cavity and in communication with the computer [32] as an alternate or additional method for controlling the opening and closing of the valve gates [31].

REFERENCES:
patent: 3840312 (1974-10-01), Paulson et al.
patent: 4279582 (1981-07-01), Osuna-Diaz
patent: 5256345 (1993-10-01), Yokota
patent: 5389315 (1995-02-01), Yabushita
patent: 5556582 (1996-09-01), Kazmer

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