Paper making and fiber liberation – Processes and products – With measuring – inspecting and/or testing
Reexamination Certificate
2007-04-03
2007-04-03
Halpern, Mark (Department: 1731)
Paper making and fiber liberation
Processes and products
With measuring, inspecting and/or testing
C162S190000, C162S263000, C162S252000, C162S336000, C700S128000
Reexamination Certificate
active
10433661
ABSTRACT:
A method of controlling the production of filler-containing paper. Filler and retention agent are delivered to a paper manufacturing system in a process of paper manufacture. The amount of filler in the paper is measured, as is also the filler concentration or the total concentration in the white water or the stock. Filler is delivered such that the system will be buffered with filler to a generally pre-determined concentration level. The continual addition of retention agent is based exclusively on the amount of filler in the paper measured at that moment in time. When the measured amount of filler present is lower than a desired level, the addition is increased. When the measured amount of filler present is higher than a desired level, the addition is reduced. The continual addition of filler is based, exclusively on the concentration level of filler measured in the white water or the stock.
REFERENCES:
patent: 6521089 (2003-02-01), Griech et al.
patent: 99/27182 (1999-06-01), None
patent: 99/27183 (1999-06-01), None
Eriksson Kent Börje
Nordin Oskar
Halpern Mark
Kubovcik & Kubovcik
M-real Corporation
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