| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 6149766 |
Process for peroxide bleaching of chemical pulp in a pressurized bleaching vessel |
November 21, 2000 |
| A process for chlorine-free bleaching of chemical pulp in association with the production thereof, where a suspension of the pulp preferably has a concentration exceeding 8% of cellulose-containing fiber material and where the pulp entering into a bleaching line is preferably fed con |
| 5919337 |
Method of continuously isothermally cooking of pulp |
July 6, 1999 |
| The present invention relates to a digester for continuous cooking, under elevated pressure and temperature, of fibre material in a vertical digester (1), where fibre material and cooking liquid are fed into the top of the digester, used cooking liquor is drawn off from at least one |
| 5827401 |
Screen system for a continuous digester |
October 27, 1998 |
| A screen system for a digester for continuous cooking under raised pressure and temperature of fiber material in a vertical vessel, where input of fiber material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one |
| 5803020 |
Recovery boiler for combustion of waste liquors |
September 8, 1998 |
| The invention relates to a recovery boiler for combustion of waste liquors. It comprises a furnace whose base and walls include a multiplicity of liquid-cooled tubes and whose base (21) constitutes a collection point for inorganic substances in molten form, with air and waste liquor bein |
| 5705031 |
Process for removing and washing dregs from green liquor in a kraft pulp mill |
January 6, 1998 |
| In a kraft pulp mill, a process and apparatus for removing and washing dregs from green liquor so that the pH of the dregs is below "hazardous waste" levels. Specifically, green liquor clarifier underflow is filtered using a simple non-precoat cassette filter to form a first dregs cake. |
| 5698079 |
Arrangement for spreading paper pulp in a container |
December 16, 1997 |
| The present invention relates to an arrangement for spreading paper pulp in a container for storing or treating the pulp, which arrangement comprises an inlet for supplying the pulp to a rotatably mounted spreader wheel and a driving member for driving said spreader wheel. The spreader w |
| 5591303 |
Process for operating a digester |
January 7, 1997 |
| In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), input of fiber material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digeste |
| 5560229 |
Diffuser |
October 1, 1996 |
| The invention relates to a diffuser, comprising a substantially cylindrical, vertical container, through which cellulose pulp is arranged to be transported, nozzle arms, for delivering a fluid, such as washing liquid, to the pulp, concentrically disposed screen surfaces and screen ar |
| 5547570 |
Screening device |
August 20, 1996 |
| A screening device for pulp production includes a cylindrical container for continuous flow-through of a fiber suspension and further includes an inlet to the container and an outlet for the fiber suspension, a moveable support member mounted in the container and which supports hollow |
| 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 |
| 5529661 |
Process for controlling the flow of cellulosic fiber material through an impregnation vessel |
June 25, 1996 |
| A process for the continuous digestion of cellulosic fiber material, comprising impregnation with impregnating liquid consisting of at least one fresh digesting liquor, in a closed impregnating system and subsequent digestion with digesting liquid in a closed digester system, said im |
| 5507141 |
Process for recovering energy from a combustible gas |
April 16, 1996 |
| A process for recovering energy from a combustible gas generated by partial oxidation of cellulose waste liquor in a gas generator (A) operating in a temperature range of 600.degree.-1300.degree. C. and a pressure in the range of 1-100 bar, cooling and cleaning said combustible gas and u |
| 5504987 |
Device for manufacturing a screening body |
April 9, 1996 |
| A screening body for a pulp digester includes two, spaced apart ring supporting a plurality of axially extending screening bars each of which has a foot portion frictionally received in and welded to a correspondingly formed recess formed on the inner side of each of the ring segment |
| 5503323 |
Screening means with a screening body, and method and device for manufacturing the screening bod |
April 2, 1996 |
| A screening body for a pulp digester includes two, spaced apart ring supporting a plurality of axially extending screening bars each of which has a foot portion frictionally received in and welded to a correspondingly formed recess formed on the inner side of each of the ring segment |
| 5470437 |
Digester for cooking pulp having staggered screens |
November 28, 1995 |
| In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), input of fiber material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried out from at least one digeste |
| 5437170 |
Washing apparatus |
August 1, 1995 |
| Apparatus for treating pulp with a treating liquid, comprising a vessel (1) with cylindrical wall (2), inner screening means (3) for withdrawing liquid from the pulp, and a plurality of distributing tubes (5) on the outside of the vessel for the supply of treating liquid into the vessel |
| 5415734 |
Process for bleaching pulp without using chlorine containing chemicals |
May 16, 1995 |
| A process is disclosed for bleaching pulp without chlorine containing chemicals and for greatly reducing total washing filtrate discharge, comprising the steps of: 1) sending pulp that has been subjected to continuous digestion, oxygen-delignification and then washing, through a wash |
