Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Mechanical defibration in the presence of heated gas or gas...
Patent
1983-04-20
1985-08-13
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Mechanical defibration in the presence of heated gas or gas...
162 28, 162 65, D21C 102, D21C 116, D21C 326
Patent
active
045343977
ABSTRACT:
A method for producing pulp in high yield in order to achieve strength improvement and increased absorption of liquid in the end-product, the paper, whereby a lignocellulosic material is treated in liquid or gas phase in alkalic media, the treatment thereby being performed in the presence of oxygen gas. The material is then mechanically defibrated in the presence of oxygen. It is possible to perform the treatment on the material when in the form of logs, chips, shavings as well as on completely or partly separated fibres. The treatment is performed in such a combination of treatment time, temperature, charge of chemicals, oxygen gas pressure and pulp consistency that pulp yield, i.e. the ratio between the produced amount of fibre and the charged amount material, is higher than 80%, preferably within the range of 80-95%.
REFERENCES:
patent: 4288288 (1981-09-01), Fleck et al.
Idner Kristina
Norrstrom Hans
AGA Aktiebolag
Alvo Steve
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