Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1990-09-21
1991-11-05
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
2643287, 425136, 425149, 425150, 425165, B29C 4577, B29C 4580
Patent
active
050630083
ABSTRACT:
An improved technique for use with a molding apparatus having a pair of separable mold elements and forming a mold cavity therebetween which includes a means for opening and closing the mold elements and a means for introducing 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 has been developed. The technique involves measuring the separating distance of the mold elements while the moldable material is being introduced into the cavity and integrating the separation distance as a function of time. When the integral value reaches a preselected value, the mold injection pressure is changed and the moldable material is allowed to cure within the cavity.
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Eastman Kodak Company
Heitbrink Jill L.
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