Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1994-12-21
1997-01-07
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
26432816, 264336, 425139, 425144, 425552, 425556, B29C 4573
Patent
active
055913857
ABSTRACT:
This invention provides a plastic molding method, a mold, and a molded article. According to this invention, the supply flow rate of a coolant, e.g., cooling water, to a mold is maintained to shorten the molding cycle and to improve the productivity in continuous molding. The temperature distribution and pressure distribution in the mold are measured, thereby realizing determination as to whether a molded article is defective or not in the molding and cooling processes. The temperatures at respective required portions of the molded article removed from the mold are monitored, so that determination as to whether a molded article is defective or not can be performed, thereby improving the productivity. Countermeasures are taken not to deform the molded article. A thermoplastic resin injected from a hot runner into a cavity is heated at a gate discharge portion by a shearing heat upon injection. Countermeasures are taken to suppress temperature increase caused by this heat. Thus, the contiguous portion between the hot runner and the cavity is formed such that a recess will not be formed in the completed molded article.
REFERENCES:
patent: 5017315 (1991-05-01), Kumazaki
patent: 5062786 (1991-11-01), Arai
patent: 5286421 (1994-02-01), Arai
Arai Takashi
Furusawa Akira
Canon Kabushika Kaisha
Heitbrink Jill L.
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