Process control system using feed forward control threads based on material groups
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United States of America Patent
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Nov 14, 2000
Grant Date -
N/A
app pub date -
Dec 12, 1997
filing date -
Dec 12, 1997
priority date (Note) -
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Abstract
A process control system using feed forward control threads based on material groups performs material tracking to account and adjust for variability of processing in a process flow that includes multiple machines, machine configurations, and machine setups. The process control system using feed forward control threads based on material groups distinguishes variations in processing parameters and characteristics for processed material samples and modifies processing at subsequent steps in response to the variations. The process control system using feed forward control threads based on material groups controls materials groups so that material samples with a like processing history are processed with a similar machine configuration or setup for subsequent processing steps. The tagging of material groups permits management of material having different process characteristics in a process flow to improve the efficiency of material scheduling by supplying information to assist sorting of materials based on a manufacturing signature.
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