Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Continuous chemical treatment or continuous charging or...
Reexamination Certificate
2011-08-16
2011-08-16
Daniels, Matthew (Department: 1741)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Continuous chemical treatment or continuous charging or...
C162S017000, C162S241000, C162S246000
Reexamination Certificate
active
07998310
ABSTRACT:
A method for the impregnation of untreated chips during the manufacture of chemical pulp. The untreated chips are fed without preceding steam treatment into an impregnation vessel that has an upper part with a first area (A1) and a lower part with a second area (A2) that is larger than the first area (A1) by a factor of at least √{square root over (2)}. The chips establish in the upper part a level of chips that is located at a level (h) above a level of fluid consisting of liquor. The chips after passage of the upper part pass through a transitional part, where an increase in area from the first area (A1) to the second area (A2) takes place, and it is here that the angle of repose of the chips is reduced.
REFERENCES:
patent: 3532594 (1970-10-01), Richter
patent: 6129816 (2000-10-01), Sheerer et al.
patent: 2003/0000660 (2003-01-01), Gustavsson et al.
patent: WO03106765 (2004-12-01), None
Gullichsen et al., Chemical Pulping 6A, 1999, Fapet Oy, p. A535.
Gustavsson Lennart
Saetherasen Jonas
Snekkenes Vidar
Calandra Anthony
Daniels Matthew
Fasth Rolf
Fasth Law Offices
Metso Paper Sweden AB
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