Process for producing mechanical pulp suitable for paper or...

Details Process for producing mechanical pulp suitable for paper or... Process for producing mechanical pulp suitable for paper or...

D - Textiles, Paper

21

C

D21C 9/10 (2006.01) D21B 1/12 (2006.01) D21C 5/00 (2006.01) D21C 9/16 (2006.01) D21D 1/00 (2006.01)

Patent

CA 2607178

Method for the production of mechanical or chemi-mechanical pulp as raw material for paper or cardboard. According to this method, the pulp is fibrillated and the fibrillated pulp is bleached in alkaline conditions. According to the present invention, the pulp is screened to separate the reject from the accept, at maximum approximately 60 % of the total amount of pulp is separated as the reject, the reject is bleached separate from the accept, and, after that, the bleached reject is remixed with the accept. When operating according to the present invention, the strength of the pulp increases and the energy used for refining is reduced, which is seen both in the refining of the reject and in the post-refining of the final mechanical pulp.

L'invention concerne un procédé de fabrication de pâte mécanique ou chimico-mécanique utilisée comme matière première pour le papier ou le carton. Selon ce procédé, la pâte est fibrillée puis blanchie dans des conditions alcalines. Selon l'invention, la pâte est tamisée à des fins de séparation de la partie rejetée d'avec la partie à conserver, avec un maximum d'environ 60 % de la quantité totale de la pâte étant séparé en tant que partie rejetée ; la partie rejetée est blanchie séparément de la partie conservée, après quoi la partie rejetée est de nouveau mélangée à la partie conservée. Lors du traitement selon la présente invention, la résistance de la pâte augmente et l'énergie utilisée pour le raffinage est réduite, lors du raffinage de la partie rejetée comme lors du post-raffinage de la pâte mécanique finie.

Affiliated with

Also associated with

Rating

Process for producing mechanical pulp suitable for paper or... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing mechanical pulp suitable for paper or..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing mechanical pulp suitable for paper or... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1835564