Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With testing – sampling or analyzing
Patent
1975-11-03
1978-04-25
Bashore, S. Leon
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With testing, sampling or analyzing
162 61, 23230A, G01N 2120, D21C 322, D21C 712
Patent
active
040861295
ABSTRACT:
A process for accurately controlling the intrinsic viscosity of sulfite pulp at the termination of a digestion operation comprising predetermining the duration of digestion time required to obtain a given pulp intrinsic viscosity for a range of initial weight ratios of combined SO.sub.2 to wood, determining during the digestion operation the initial weight ratio of combined SO.sub.2 to wood by measuring the rate of change of absorbance in the digestion cooking liquor and terminating the digestion operation at a time corresponding to the predetermined time required to obtain the given pulp intrinsic viscosity at the aforesaid combined SO.sub.2 to wood ratio.
REFERENCES:
patent: 2615339 (1952-10-01), Holgersson
patent: 3555204 (1971-01-01), Anderson
patent: 3748044 (1973-07-01), Linton
patent: 3837217 (1974-09-01), Schulz
patent: 3941649 (1976-03-01), Wallin
Pulping Processes; Rhydholm; pp. 439-451, New York, 1967.
MacDonald, Editor "Pulp and Paper Manufacture", p. 150, McGraw-Hill Book Company, New York, 1969.
Conca Romeo John
Gray John Patrick
Sloan Tod Hunter
Alvo Steve
Bashore S. Leon
Holt H. J.
International Telephone and Telegraph Corporation
Raden J. B.
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