Boots – shoes – and leggings
Patent
1989-12-07
1991-07-16
Ruggiero, Joseph
Boots, shoes, and leggings
162238, 162DIG10, 364165, 364471, G06F 1546, D21C 712
Patent
active
050329766
ABSTRACT:
A method and apparatus for controlling the delignification process by monitoring and minimizing variations in the Kappa Number and the digester residual chemical concentration. A parameter representative of the H factor for the delignification process and a measurement of the initial chemical concentration are utilized to produce signals representative of the actual Kappa Number and the residual acid concentration in the digester. The expected perturbations in Kappa Number and the residual chemical concentration are compared with target values for same to produce estimated errors due to mismatch which are compared with actual measured errors for these parameters to produce compensated control errors for same. The compensated control errors are utilized to modify the target values for the H factor and the initial chemical concentration by modifying the chemical charge and the time versus temperature operating parameters of the digestings to regulate pulp Kappa number and spent cooking liquor residual chemical concentrations of the process.
REFERENCES:
patent: 3941649 (1976-03-01), Wallin
patent: 4295929 (1981-10-01), Leithem
patent: 4348256 (1982-09-01), Bergstrom et al.
patent: 4540468 (1985-09-01), Genco et al.
patent: 4746405 (1988-05-01), Lisnyansky et al.
patent: 4780182 (1988-10-01), Baker
Beller Jeffrey A.
Johnson Ralph K.
Kammerer Roger
Kaya Azmi
Keyes, IV Marion A.
Edwards Robert J.
Elsag International B.V.
Kalka Daniel S.
Matas Vytas R.
Ruggiero Joseph
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