| Patent Number |
Title Of Patent |
Date Issued |
| 7615134 |
Method and arrangement of impregnating chips |
November 10, 2009 |
| The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ_LEV) is established under the highest level (CH_LEV) of the chips. |
| 7547374 |
Method for impregnating chips in a continuous digestion system |
June 16, 2009 |
| A method for impregnating chips in a continuous digestion system with an impregnation vessel and a digester. The digestion system has a heat exchanger arranged between a first return line and a black liquor line. The heat exchanger allows a transfer of heat between the two lines. A p |
| 7540937 |
Method for continuous cooking |
June 2, 2009 |
| A procedure for the continuous cooking of chemical pulp, comprising an impregnation vessel 101 and a digester 102. The chips are impregnated in the impregnation vessel 101and are fed after impregnation together with circulation fluid through a transfer line 103 to a top separator 105 on |
| 7501043 |
Steam treatment of chips with the addition of an acid liquid |
March 10, 2009 |
| The method is for the pre-treatment of chips that are fed to a sulphate cooking process. Through the addition of an acidic fluid to the steam treatment step, a very high ionic concentration of hydrogen ions is achieved. When the chips are subsequently formed into a slurry with a pref |
| 7497927 |
Continuous digester with fluid circulation |
March 3, 2009 |
| The arrangement concerns an improved design for at least one of the cooling, dilution and washing at the bottom of a continuous digester for the production of cellulose pulp. By arranging at least one extra strainer section above the lowermost strainer section, with the addition of w |
| 7459058 |
Feed of a mixture of chips and fluid from a low-pressure system to a high-pressure system |
December 2, 2008 |
| Chips are sluiced from a low-pressure section to a high-pressure section with a sluice feeder. The fluid that is used to expel the chips from the sluice feeder principally includes pressurized fluid withdrawn from the treatment vessel. This pressurized fluid is normally withdrawn from th |
| 7445691 |
Impregnation of chips with an acid liquid prior to a sulphate pulping process |
November 4, 2008 |
| The method is for pre-treatment of chips that are fed to a sulphate cooking process. Through acidification of the chips in an acidic treatment fluid with a subsequent draining of free treatment fluid before subsequent steaming or wet-steaming, a high concentration of free hydrogen io |
| 7422657 |
Method for the feed of cellulose chips during the continuous cooking of cellulose |
September 9, 2008 |
| The method is for feeding a chips-slurry from a low-pressure to a high-pressure system during the continuous cooking of chemical cellulose pulp. The feed takes place through a sluice feeder 53' between these systems. The sluice feeder is provided with a rotor with through-pockets 1, |
| 7381302 |
Method and arrangement for impregnating chips |
June 3, 2008 |
| The method and an arrangement are for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Un-steamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ_LEV) is established under the highest level (CH_LEV) of the chips. |
| 7374637 |
Method of bleaching cellulose pulp with a main conduit for wash liquor and filtrate |
May 20, 2008 |
| The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main conduit is used for |
| 7351306 |
Cooking of cellulose pulp in a cooking liquor containing pre-evaporated black liquor |
April 1, 2008 |
| The method is for cooking of cellulose pulp in which the raw material, preferably in the form of chips, undergoes a successive elevation of temperature towards the cooking temperature while the chips are first impregnated with an impregnation liquor followed by cooking in a cooking l |
| 7351305 |
Method and a digester for the continuous cooking of wood raw material to cellulose pulp |
April 1, 2008 |
| The digester and method are for the continuous cooking of pulp. At least two withdrawal positions (11E, 11D) for cooking fluid are arranged at different heights in the digester (10). The cooking fluid in the first and second position is withdrawn after the chips have had a retention |
| 7285179 |
Continuous digester for cellulose pulp including method and recirculation system for such digest |
October 23, 2007 |
| The continuous digester is for producing chemical pulp to a process for operating this digester and to a feedback system for the cooking liquid. By means of implementing cooking zones 1st, 2nd, 3rd, 4th and 5th down through the digester, that have a successively decreasing liquid-to-wood |
| 7279070 |
Method for the continuous cooking of wood raw material for cellulose pulp |
October 9, 2007 |
| The invention concerns a simplified method for the continuous cooking of wood raw material in the form of sawdust for the production of cellulose pulp, The method does not require any thickening stages and can be carried out with a minimum of process equipment. The complete process can |
| 7270725 |
Pretreatment of chips with white liquor prior to a treatment with black liquor |
September 18, 2007 |
| The method is for the manufacture of cooked cellulose pulp in which the starting material, preferably chips, undergoes a successive increase in temperature towards cooking temperature. This is done while the chips are first treated in a pre-treatment zone in which the main part, greater |
| 7229524 |
Feeding arrangement for feeding of chips to chip bins |
June 12, 2007 |
| The invention relates to a feed arrangement for feeding chips to chip bins (1) in the production of cellulose pulp in continuous digesters (16), in which the chip bin is constituted by a treatment vessel having a top and a bottom, in which the chips are fed into the top (13) of the treat |
| 7217338 |
Process for continuously cooking chemical cellulose pulp |
May 15, 2007 |
| The process is for continuously cooking chemical pulp in a digester system consisting of at least one vessel for impregnating and cooking comprising an inlet into which a mixture of chips and process liquid is fed. The chips are impregnated at a predetermined impregnation temperature, |
| 7214291 |
Method for the modification of cellulose fibres |
May 8, 2007 |
| The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking and/or delignification of cellulose chips in a |
| 7112256 |
Method for continuous cooking of chemical pulp to improve heat economy |
September 26, 2006 |
| A method for the continuous cooking of chemical pulp with the aim of achieving improved heat economy in a digester system having a vessel (1) for impregnation and a vessel (2) for cooking the impregnated cellulose chips. A part of the black liquor (14) withdrawn from the digester (2) is |
| 7077931 |
Method and bleaching line with a main conduit for wash liquor |
July 18, 2006 |
| The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main conduit is used for |
| 6966970 |
Method for supplying washing liquid to a process for cooking cellulose pulp |
November 22, 2005 |
| The invention relates to a method for supplying washing liquid to a digester (1) for cellulose pulp and a subsequent diffuser washing device (2a, 2b). A high, disturbance-free production capacity can be obtained by using a common feed pump (P1) which, via a main feed line (10), supplies |
| 6843885 |
Method for controlling the cooking temperature in a continuous vapour phase digester |
January 18, 2005 |
| The method is for controlling the cooking temperature in a continuous vapour phase digester for chip-shaped cellulose material. A high pressure is established in the vapour phase largely by means of steam, without risk of attaining excessively high temperatures in the cooking. A temp |
| 6722130 |
Method of producing process steam from a black liquor |
April 20, 2004 |
| Method of producing a process steam from a first black liquor derived in connection with the production of paper pulp, wherein the first black liquor is treated to give a second black liquor of a higher concentration than the first black liquor as well as a liquid of low concentration, |
| 6699357 |
Process for continuous cooking of pulp |
March 2, 2004 |
| The invention relates to a process for continuous cooking of wood chips at elevated pressure and temperature in a vertical digester (1) for production of chemically dissolved pulp. Fiber material and cooking liquor are introduced at the top of the digester and pulp is discharged from the |
| 6361649 |
Method for the continuous cooking of chemical pulp |
March 26, 2002 |
| A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means |
| 6332954 |
Continuous digester system having a top separator |
December 25, 2001 |
| A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being connected to each other by means |
| 6332950 |
Method in connection with the pretreatment of comminuted fibrous material |
December 25, 2001 |
| A method in connection with the pretreatment of comminuted fibrous material intended for chemical cellulose pulp production. The fibrous material is fed through a low pressure system that has a gas phase part followed by a liquid phase part. The liquid phase part includes a low pressure |
| 6325889 |
Hydraulic vessel system having a downwardly feeding separator |
December 4, 2001 |
| A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time a |
| 6280567 |
System and method for treatment of cellulose-containing material prior to pulp digestion |
August 28, 2001 |
| The invention relates to a process system and a method for preliminary treatment of disintegrated cellulose-containing material, preferably wood chips, prior to pulp digestion. The process system and the method according to the invention make use of a process vessel intended to funct |
| 6254723 |
Method for continuous cooking in a single-vessel digester |
July 3, 2001 |
| In a single-vessel system for continuous cooking of kraft pulp, chips and liquor are conveyed from a high pressure feeder in a transfer line to a first end of a digester. A part of the liquor is separated from the chips that are withdrawn from an outlet defined in an upper part of the di |
| 6214171 |
Top separator in a continuous digester system |
April 10, 2001 |
| A method in connection with continuous cooking of chips that comprises impregnating the chips with a impregnation liquid in an impregnation vessel and cooking the impregnated chips in a digester. The impregnation vessel and digester are connected to one another by means of a transfer |
| 6203662 |
Method for the continuous cooking of pulp in a digester system having a top separator |
March 20, 2001 |
| This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy, |
| 6171494 |
Hydraulic vessel system having a downwardly feeding separator |
January 9, 2001 |
| A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time a |
| 6159336 |
Method and device for the continuous cooking of pulp |
December 12, 2000 |
| This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy, |
| 6123807 |
Method for the continuous cooking of pulp |
September 26, 2000 |
| This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy |
| 6086717 |
Separator having a screen basket disposed in a digester |
July 11, 2000 |
| A new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemical consumption and heat-economy and at the same time a |
