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Solidification sensing for closed loop control of injection molding hold time

✍ Scribed by Charles L. Thomas; Ampere A. Tseng; Anthony J. Bur; Joseph L. Rose

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 1006 KB
Volume: 15
Category: Article
ISSN: 0730-6679
DOI: 10.1002/(sici)1098-2329(199622)15:2<151::aid-adv5>3.0.co;2-u

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✦ Synopsis

Hold time for injection molding is currently controlled open loop, using a fixed time delay set by the machine operator. Insufficient hold time leads to inconsistent moldings, while excessive hold time increases the cost of the part. We have developed new sensors that monitor the solidification of polymer in the mold. A closed loop strategy is demonstrated where the hold time is automatically controlled based on feedback from a solidification sensor. Using this strategy, the hold time is set once in reference to the sensor signal, providing the minimum proper hold time for each part under changing processing conditions. rn

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