Method and apparatus for controlling screw positions in injectio

Details Method and apparatus for controlling screw positions in injectio Method and apparatus for controlling screw positions in injectio

1986-08-12

1989-05-23

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

425135, B29C 4503, B29C 4576

Patent

active

048328839

ABSTRACT:
A method for controlling an injection molding machine involving the steps of: detecting, by a screw position detector, a position of a screw of the injection molding machine immediately before the start of injection, to produce a detecting signal; comparing the detecting value with a predetermined value for a plasticizing/measurement position set in a metering position setter, to calculate any deviation therebetween; and adding/substracting the deviation to or from predetermined values representative of switching-over positions set in switching-over position setters, thereby keeping constant an actual screw stroke from the plasticizing/measurement position to the switching-over position for every shot of the injection molding machine.

REFERENCES:
patent: 3859400 (1975-01-01), Ma
patent: 3920367 (1975-11-01), Ma et al.
patent: 4066725 (1978-01-01), Boettner

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