Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Patent
1985-09-04
1987-10-13
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
162 22, 162 23, 162 94, 162 96, D21C 326
Patent
active
046996915
ABSTRACT:
A process for thermomechanical digestion using a multiple blowdown technique. The digestion chemical is added just prior to blowdown which results in a concentration of digesting chemicals on the fiber. The process can be carried out with a digester having multiple chambers, each at a lower pressure has many advantages in forming pulps suitable for newsprint or fine papers from wood and vegetable fiber sources. The digester should be of a kind where the fiber will have a greater residence time in subsequent chambers.
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Alvo Steve
McDowell, Jr. William W.
McGreal Michael J.
W. R. Grace & Co.
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