D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
D21D 5/02 (2006.01) D21B 1/12 (2006.01) D21C 9/00 (2006.01) D21H 11/08 (2006.01)
Patent
CA 2393783
The object of the present invention is a method for making mechanical pulp, such as thermomechanical or chemi-thermomechanical stock. The mechanical pulp is utilised as a raw material for printing paper, and its freeness value is 30- 70 ml CSF. According to the method, the refined stock is screened in several stages into accept and reject stock portions. The stock is screened at a consistency of not less than 10 %.
L'invention concerne un procédé de préparation de pâte à papier mécanique, telle qu'une pâte thermomécanique ou chimico-thermomécanique. On utilise la pâte à papier mécanique en tant que matière première destinée à du papier d'impression, l'indice CSF d'égouttage (<=Canadian Standard Freeness>=) de cette pâte étant de l'ordre de 30 à 70 ml. Selon ce procédé, la pâte raffinée est criblée, au niveau de plusieurs étapes, en portions de pâte acceptées et en portions de pâte rejetées, ce criblage s'effectuant sur une pâte dont la consistance n'est pas inférieure à 10 %.
Gummerus Markku
Tienvieri Taisto
Macrae & Co.
Upm-Kymmene Corporation
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