Paper making and fiber liberation – Apparatus – Digester
Reexamination Certificate
2007-04-17
2007-04-17
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Apparatus
Digester
C162S198000, C162S062000, C162S049000, C162SDIG010, C162S262000, C162S263000, C700S127000, C700S128000, C700S129000, C700S029000
Reexamination Certificate
active
10639509
ABSTRACT:
A system for controlling a processor having at least one sampling port connected to a stage of the processor in order to sample a reactant product from the processor. The system includes a controller configured to control a processing parameter of the processor based on measurements of at least one property of the reactant product such that changes to the processing parameter maintain a target value for the at least one property of the reactant product. The system further includes a dead time compensator. The dead time compensator is configured, based upon a prescribed dead time related to a time before at least one effect of at least one change to the processing parameter is fully realized, to evaluate the reactant product to determine if the effect has been realized at a plurality of sequential times offset from the dead time.
REFERENCES:
patent: 4216054 (1980-08-01), Bentvelzen et al.
patent: 5032977 (1991-07-01), Beller et al.
patent: 6421575 (2002-07-01), Shakespeare
TAPPI Test Methods, 1996-1997, TAPPI Press, 1996, T 236 cm-85, pp. 1-3.
Halpern Mark
Metso Automation USA Inc.
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