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
1986-01-21
1988-02-16
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 406, 264 454, 264 53, 2643281, 264DIG9, 264DIG83, 425144, 425149, B29C 6704, B29C 6722, C08J 922
Patent
active
047253894
ABSTRACT:
A method for foaming and sintering of foamable plastic employing a control method based on the detection of the softening time point during the sintering steam application in the sintering process step. The softening time point is detected by analysis of a change in the rising speed of the pressure or temperature, and the related pressure and temperature values are used for determining the maximum dismission temperature and pressure of the sintered product. The sintering time is determined in relation to the softening time point and the quality demanded. A feed back control to the prefoaming and drying process step is provided. A feed back control by means of a quality measurement at the sintered part to the sintering is provided. Incremental controls are provided for adaptive process optimization.
REFERENCES:
patent: 3328497 (1967-06-01), Baxter et al.
patent: 3963816 (1976-06-01), Smith
patent: 4244897 (1981-01-01), Moon
patent: 4333897 (1982-06-01), Hayashi et al.
patent: 4615849 (1986-10-01), Hahn
Hahn Ortwin
Tiba Mohamed-Hussein
Hahn Ortwin
Tentoni Leo B.
Thurlow Jeffery
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