Method of deinking recovered paper

D - Textiles – Paper – 21 – C

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

D21C 5/02 (2006.01)

Patent

CA 2681140

A process for producing a deinked pulp from waste printed papers including adherent substances. In the process, adherent foreign substances are prevented from undergoing size reduction and a wastewater is reduced in COD. By the process, a deinked pulp reduced in residual ink content is produced. In an ink removal step in producing a deinked pulp from waste printed papers including adherent substances, the anhydride of a crystalline phyllosilicate is added in an amount of preferably 0.1-1.5 mass% based on the pulp on an oven-dry basis to conduct the ink removal treatment at a pH of 7.0-9.9. By the process, a deinked pulp reduced in residual ink can be produced even when the ink removal treatment is conducted under weakly alkaline to neutral conditions, which are generally regarded as effective in diminishing adherent foreign substances but poor in ink removal.

Procédé permettant de produire une pâte désencrée à partir de vieux papiers imprimés sur lesquels des substances sont collées. Au cours de ce procédé, qui donne une pâte désencrée contenant moins d'encre résiduelle, les substances étrangères collées ne rétrécissent pas, et la COD des eaux usées est réduite. L'étape d'élimination de l'encre comprend l'ajout de l'anhydride d'un phyllosilicate cristallin représentant de préférence 0,1 à 1,5 % en masse de la pâte absolument sèche, pour obtenir un pH de 7,0 à 9,9 lors du traitement aboutissant à l'élimination de l'encre. Ce procédé peut produire une pâte désencrée contenant moins d'encre résiduelle même lorsque le traitement qui aboutit à l'élimination de l'encre est réalisé dans des conditions allant de faiblement alcalines à neutres, conditions que l'on considère généralement comme bonnes pour réduire les substances étrangères collées, mais relativement mauvaises pour éliminer l'encre.

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 of deinking recovered paper 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 of deinking recovered paper, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of deinking recovered paper will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1764382

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