Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling heat transfer with molding material
Patent
1994-03-28
1997-03-25
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling heat transfer with molding material
264 407, 425144, B29C 4792
Patent
active
056141378
ABSTRACT:
A process for the cyclic control of extruders which facilitates the precise control of an extruder to achieve maximum output and at the same time optimal quality of the extruded profiles. Accordingly therefore the extrusion velocity is controlled in such a way that the profile exit temperature is constant and equal to a prescribed temperature trajectory. Thereby the extrusion velocity and the profile exit temperature are measured over the complete cycle interval for each and every cycle k, and with the knowledge of the relationship between these quantities and the trajectory of the extrusion velocity of the cycle k, the trajectory of the extrusion velocity for the (k+1)th cycle is determined, such that the control error and the control effort are as low as possible and after completion of the (k+1)th extrusion cycle the whole process is repeated for every subsequent cycle therefore until the whole extrusion program is completed. The process is especially suited for the manufacture of extruded profiles of metals with low and/or wavelength dependent emmissivity and/or variable surface characteristics, in particular for the manufacture of extruded aluminium and aluminium alloy profiles.
REFERENCES:
patent: 2863557 (1958-12-01), Munker
patent: 3422648 (1969-01-01), Lemelson
patent: 3670542 (1972-06-01), Kemppinen et al.
patent: 4675826 (1987-06-01), Gentry et al.
patent: 5237844 (1993-08-01), Duri
patent: 5306365 (1994-04-01), Reighard
Buchheit Karl-Heinz
Pandit Madhukar
Mannesmann AG
Vargot Mathieu D.
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