Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Mechanical defibration in the presence of heated gas or gas...
Patent
1976-07-19
1979-03-20
Fisher, Richard V.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Mechanical defibration in the presence of heated gas or gas...
162 24, 162 28, 162 71, 162 83, 162142, D21B 130
Patent
active
041452461
ABSTRACT:
A high-strength, high-yield sulfite-modified thermomechanical pulp is formed by subjecting lignocellulose to multistage mechanical attrition, the first stage being conducted at elevated temperature and pressure and the second stage being run under atmospheric conditions. A sulfite chemical is added to the lignocellulose prior to the second stage, the lignocellulose being sulfonated so that a percent bound sulfur level of at least about 0.15% is provided. A novel linerboard composition is unexpectedly produced employing replacement quantities of the above described pulp.
REFERENCES:
patent: 2425024 (1947-08-01), Beveridge et al.
patent: 2454533 (1948-11-01), Walter
patent: 3597310 (1971-08-01), Sumi et al.
patent: 3808090 (1974-04-01), Logan et al.
patent: 3873412 (1975-03-01), Charters et al.
Casey "Pulp & Paper," vol. II (1960), pp. 340, 341.
"Paper Trade Journal," vol. 159, No. 6, (Jun. 15, 1975), pp. 59, 60.
Fahey Michael D.
Goheen David W.
Chin Peter
Crown Zellerbach Corporation
Fisher Richard V.
Marger Jerome S.
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