Method and apparatus for bleaching wood pulp, especially...

D - Textiles – Paper – 21 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

D21C 5/02 (2006.01) D21B 1/32 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2260935

A method of treating wood-fibre pulp, particularly wood-fibre pulp that contains recycled paper, comprises delivering the pulp to and advancing the pulp in a heating zone while delivering steam to the heating zone. The pulp is finely-divided in a disperser and the finely-divided pulp delivered to a screw press without separate departure of steam, so as to compact the pulp in the end of the screw press and therewith form a plug seal. At the same time, one or more bleaching chemicals is or are supplied during one or more treatment stages, and the temperature of the pulp is regulated to obtain an optimal bleaching process or optimal bleaching processes. The temperature of the pulp can be raised or lowered by supplying steam or water thereto respectively. The invention also relates to a plant for carrying out the method.

La présente invention concerne un procédé de traitement de pâte de bois, celle en particulier qui contient du papier de recyclage, consistant à amener la pâte et à la faire avancer dans une zone de chauffe recevant de la vapeur. On pulvérise la pâte dans un disperseur et on la distribue dans une presse à vis sans sortie séparée de vapeur, de manière à comprimer la pâte vers l'extrémité de la presse à vis et à y former un bouchon. Au cours d'une ou plusieurs étapes du traitement, on a recours à un ou plusieurs produits chimiques de blanchiment et on régule la température de la pâte de bois de manière à obtenir un ou des processus de blanchiment optimaux. On peut augmenter ou diminuer la température de la pâte de bois en utilisant respectivement de la vapeur ou de l'eau. L'invention concerne également une installation pour la mise en oeuvre du procédé.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for bleaching wood pulp, especially... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for bleaching wood pulp, especially..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for bleaching wood pulp, especially... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1861960

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.