Raw material for printing paper, method to produce it and...

D - Textiles – Paper – 21 – B

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Details

D21B 1/14 (2006.01) D21B 1/12 (2006.01) D21D 1/20 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2393858

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.

La présente invention concerne un procédé de fabrication de pâte à papier mécanique telle qu'une pâte thermomécanique ou une pâte chimio-thermomécanique. La pâte à papier mécanique est utilisée en tant que matière brute dans la fabrication de papier d'impression, et son indice d'égouttage est de 30-70 ml CSF. La pâte raffinée selon ce procédé est criblée en plusieurs étapes afin d'obtenir une partie de pâte admise et une partie de pâte rejetée. La matière brute de bois est raffinée au cours de la première étape de raffinage à une pression superatmosphérique supérieure à 400 kPa afin d'obtenir une pâte ayant un indice d'égouttage de 250-700 ml CSF.

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