Process for producing flat and annular-cross-section extrudates and device for implementing the process
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United States of America Patent
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Mar 14, 1995
Grant Date -
N/A
app pub date -
Jun 25, 1993
filing date -
Oct 25, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In prior art processes of this kind the actual thickness of the extrudate is measured, compared with a reference thickness and the setting regions of an extrusion plant are controlled dependent upon the degree of difference. In order nevertheless to improve the quality of the extrudate in relation to the desired reference thickness, according to the invention the evolution strategy process is used. An increase in the convergence rate can also be attained by taking into account strategy parameters which can be deterministically or stochastically changed, whereby mixing including fixedly settable strategy parameters is also possible. In particular, knowledge of the process can be involved as qualitative process partial knowledge.
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