Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Patent
1995-03-14
1996-03-19
Hastings, Karen M.
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
162254, 162261, 241 30, 241 36, 364157, 364176, B02C 2500, B02C 714
Patent
active
055000886
ABSTRACT:
The load on a refiner motor is controlled by adjusting the motor load setpoint by monitoring load applied by the refiner and the plate gap between the refiner plates to define the curve of the load versus plate gap relationship. This slope of load versus plate gap relationship is estimated and when the sign of the slope of the curve changes sign indicating operation in an unstable zone of pad collapse and based on the tendency for the refiner to be in the unstable operation zone over a selected period of time exceeding a preset limit adjusting the setpoint lower to approach more closely the maximum load applied over the selected time.
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patent: 4073442 (1978-02-01), Virving
patent: 4233600 (1980-11-01), Rogers et al.
patent: 4586146 (1986-04-01), Dumbeck et al.
patent: 4646226 (1987-02-01), Moon
patent: 4820980 (1989-04-01), Dodson-Edgars
"Self-Tuning Control of a Chip Refiner Motor Load", Dumont, G. A., Automatica, vol. 18, No. 3, pp. 307-314 (1982).
"Computer Control of a TMP Plant", Dumont, G. A., Legault, N. D., Jack, J. S., Rogers, J. H., Pulp & Paper Canada, 83:8, pp. T224-T229 (1982).
"Thermo-Mechanical Pulping Process Control", Jones, R. E., Pila, A., Canadian Pulp & Paper Association Annual Meeting, pp. B105-B111 (1983).
Allison Bruce J.
Ciarniello Joe E.
Dumont Guy A.
Tessier Patrick J.
Hastings Karen M.
MacMillan Bloedel Limited
Rowley C. A.
The University of British Columbia
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