| Patent Number |
Title Of Patent |
Date Issued |
| 6605181 |
Peroxide bleach sequence including an acidic bleach stage and including a wash stage |
August 12, 2003 |
| A method and device for bleaching chemical paper pulp or dissolving wood pulp, which has been cooked and delignified without employing chlorine-containing chemicals, comprising a bleaching sequence which comprises optionally a first stage comprising a chelation treatment step; a seco |
| 6325891 |
Method of bleaching pulp without using chlorine chemicals in a (QP)Z bleaching sequence |
December 4, 2001 |
| Provided is a method of treating chemical paper pulp having the steps of:adjusting the pH of the pulp to be between 1 and 6;treating the pulp with ozone to reduce the kappa number of the pulp;treating the pulp with a chelating agent after the ozone treating step without any intervening washing s |
| 6063238 |
Black liquor impregnation in digester |
May 16, 2000 |
| The present invention relates to a digester and a method for continuously cooking kraft pulp in a single-vessel system (1), preferably a single-vessel hydraulic digester, with chips (2) being fed in at a first end (3) of the digester (1), white liquor (4) being added at at least one |
| 5925216 |
Method of continuous pulping in a digester with high black liquor usage in the impregnation stag |
July 20, 1999 |
| The present invention provides a method for continuously cooking kraft pulp in a digester having the steps of:feeding chips into an inlet of a digester;supplying black liquor to an impregnation zone of the digester in an amount such that the black liquor makes up greater than 40% by volume o |
| 5672245 |
Recycling of knots in a continuous process for cooking chemical pulp |
September 30, 1997 |
| The present invention relates to a process for continuous cooking of chemical pulp, in which the chips are fed into a chip chute (3), which is arranged on top of a high pressure feeder (4) for passing the chips into a downstream, pressurized continuous digester housing comprising a verti |
| 5540816 |
Method of integrating bleaching and recovery in the production of pulp |
July 30, 1996 |
| A method of integrating bleaching and recovery in connection with the production of chemical pulp that has been digested and preferably delignified with oxygen gas using processes that retain the viscosity and strength, to kappa number less than 16 without the use of chemicals contai |
