Paper making and fiber liberation – Processes and products – Mineral fiber
Reexamination Certificate
2005-04-12
2005-04-12
Fortuna, JoséA. (Department: 1731)
Paper making and fiber liberation
Processes and products
Mineral fiber
C162S155000, C162S020000, C241S021000, C241S024100, C241S029000, C241S030000
Reexamination Certificate
active
06878236
ABSTRACT:
The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is used as a raw material for printing paper, and its freeness value is 30-70 ml CSF. The stock refined by the method is screened in several stages to form accept and reject stock portions. The wood raw material is refined at the first stage of refining at a superatmospheric pressure of over 400 kPa to form a stock that has a freeness value of 250-700 ml CSF.
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Printout from Dialog(R) File 351 is provided for Finnish publication which supplies relevant patent information, and English language title and abstract.
Gummerus Markku
Tienvieri Taisto
Fitch Even Tabin & Flannery
Fortuna JoseA.
Upm-Kymmene Corporation
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