Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1988-06-20
1990-01-09
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 405, 2643281, 425150, B29C 4557
Patent
active
048926906
ABSTRACT:
An injection molding method 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 a 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 method relates to data acquisition and application in the operation of the injection machine and includes the steps of closing the mold elements, injecting a moldable material into the mold cavity at the first pressure, measuring the separation of the mold elements during the injection of the moldable material, changing the injection pressure from the first pressure to the second pressure upon detecting a predetermined separation known to produce an acceptable product. The second pressure is maintained until the thermoplastic material has cured, and the mold is opened and the cured product is ejected. The maximum separation of the mold elements is detected and accumulated from 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 the selected value of the separation is substituted for the predetermined separation for use during subsequent cycles to improve product quality.
REFERENCES:
patent: 4413967 (1983-11-01), Burry
patent: 4767579 (1988-08-01), Buja et al.
Eastman Kodak Company
Heitbrink Jill L.
Randall Robert L.
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