Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1994-05-20
1995-10-10
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
26421121, 26432814, 425143, 425207, 425550, 366145, 364477, B29C 4574, B29B 782
Patent
active
054568706
ABSTRACT:
An improved temperature control system using a state controller with two degrees of freedom to regulate the temperature of the barrel of an injection molding machine is disclosed. The control system divides the temperature of the barrel into longitudinally-extending zones and radially extending layers within each zone. Heat transfer calculations which include the effects of heat transfer between all the layers within the zones are performed for a set time in the future to accurately determine the heat needed from the heater band to reach the operator set point temperature. The duty cycle for the heater bands is thus accurately set to give a more responsive and accurate control than heretofore possible. The controller additionally includes factors for accounting for heat disturbances present in the injection molding process. In addition each system is calibrated for each machine to insure accurate formulation of machine specific parameters such as heat transfer co-efficients used in the control.
REFERENCES:
patent: 5397515 (1995-03-01), Searle
Computer Controlled Systems: Theory and Design, Karl J. Astrom and Bjorn Wittenmark, 1990 Prentice-Hall, Inc., pp. 148-183.
Heat Tarnsfer, J. P. Holman, 1976 McGraw-Hill, Inc., pp. 123-135.
Elementary Differential Equations and Boundary Value Problems, William E. Boyce and Richard C. DiPrima, 1977 John Wiley & Sons, Inc., pp. 453-460 and 549-554.
Digital Control System Analysis and Design, Charles L. Phillips and H. Troy Nagle, 1990 Prentice-Hall, Inc., pp. 336-349.
Digital Filters, by AT&T, R. W. Hamming, 1989 Prentice-Hall, Inc., pp. 1-20.
Numerical Methods for Partial Differential Equations, William F. Ames, 1992 Academic Press, Inc., pp. 8-20.
Heitbrink Jill L.
Nawalanic Frank J.
Van Dorn Demag Corporation
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