Apparatus for data acquisition and application in an injection m

Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Control means responsive to product weight or dimension

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264 404, 264 405, 425145, 425149, 425150, B29C 4577, B29C 4580

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active

049041720

ABSTRACT:
An injection molding apparatus utilizing an injection molding machine having a pair of separable mold elements forming a mold cavity therebetween and arranged for separation for the removal of the molded product, means for opening and closing the mold elements, and injection means for injecting the moldable material into the mold cavity at a first pressure and for exerting a second pressure on the moldable material as it cures in the cavity. The apparatus provides data acquisition and application in the operation of the injection machine. The apparatus includes means for measuring the separation of the mold elements during the injection of the moldable material, and means for causing the injection pressure from the first pressure to the second pressure upon detecting a predetermined separation known to produce an acceptable product. Means is provided for maintaining the second pressure until the thermoplastic material has cured. The mold is then opened and the cured product is ejected. Means is provided for detecting and accumulating the maximum separation of the mold elements during a plurality of mold cycles while producing acceptable product. Then, a value for the separation of the mold elements is selected based on the maximum measurements accumulated, and means is provided for substituting the new value for use during subsequent cycles to improve product quality for the predetermined separation previously used.

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Bernard Sanschagrin, "Process Control of Injection Molding", Polymer Engineering and Science, Mid-Jun. 1983, vol. 23, No. 8, pp. 431-437.

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