Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1982-07-27
1985-04-02
Silbaugh, Jan
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264550, 425143, 425144, 425170, 4253871, 425398, B29C 1703, B29C 1704
Patent
active
045086702
ABSTRACT:
The temperature of upper and lower parts of a forming tool making deep-drawn thermoplastic articles is controlled with a system which performs the steps of passing a coolant of predetermined total volume through the upper part and the lower part of the forming tool; measuring the temperature of the upper and lower parts; determining the actual temperature difference between the upper and lower parts; comparing the actual temperature difference with a predetermined desired temperature difference; generating a signal representing the magnitude of deviation between the actual and desired temperature differences; and, as a function of the signal, increasing the volume of coolant passing through one of the forming tool parts and decreasing the volume of coolant passing through the other of the forming tool parts for reducing the magnitude of deviation while maintaining the total volume unchanged.
REFERENCES:
patent: 2797179 (1957-06-01), Reynolds et al.
patent: 3427687 (1969-02-01), Miller
patent: 3583467 (1971-06-01), Bennett et al.
patent: 3932096 (1976-01-01), Kaitman
patent: 4354812 (1982-10-01), Wieder et al.
patent: 4383815 (1983-05-01), Kiefer et al.
Considine, Douglas M., "Process Instruments and Controls Handbook", McGraw Hill Book Co., 1974, N.Y., N.Y., pp. 19-19 to 19-20 and 18-19 to 18-21.
Adolf Illig Maschinenbau GmbH & Co.
Lorin Hubert C.
Silbaugh Jan
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