EP1766135A1 - A method and an arrangement at a paper machine - Google Patents
A method and an arrangement at a paper machineInfo
- Publication number
- EP1766135A1 EP1766135A1 EP05761319A EP05761319A EP1766135A1 EP 1766135 A1 EP1766135 A1 EP 1766135A1 EP 05761319 A EP05761319 A EP 05761319A EP 05761319 A EP05761319 A EP 05761319A EP 1766135 A1 EP1766135 A1 EP 1766135A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process liquid
- pulp
- liquid
- consistency
- additive agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 114
- 230000008569 process Effects 0.000 claims abstract description 101
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- 230000009969 flowable effect Effects 0.000 claims abstract description 7
- 238000003892 spreading Methods 0.000 claims abstract description 6
- 230000007480 spreading Effects 0.000 claims abstract description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 239000000835 fiber Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 16
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000000049 pigment Substances 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 7
- 238000010924 continuous production Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 description 9
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 5
- 239000001913 cellulose Substances 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 238000005188 flotation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
- D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
Definitions
- the present invention relates to a method at a paper machine for reducing the spreading of agents added to the process in a continuous process for preparation of pulp for a paper machine, whereby a flowable paper pulp including fibres and process liquid and having a consistency of not more than 10% is conducted to the headbox of the paper machine.
- the present invention also relates to an arrangement at the pulp preparation for a paper machine in order to restrict a spreading of additional agents in the further process, whereby the process comprises an inlet for a flowable pulp having a consistency of not more than 10 % and including a fibre material and a process liquid, a closed cycle system including a headbox for the paper machine, as well as means for adding said additional agent.
- a paper machine is defined as a machine for manufacturing paper as a continuous web.
- the expression pulp preparation as used in the present patent application indicates a process where starting from a pulp mass comprising fibres, usually a cellulose material, and having a more or less firm consistency, a paper pulp mass is prepared under mixing to be transferred further to the head ⁇ box, whereby the pulp mass includes not more than 10 % fibre material, normally at least 1 %, suitably 2 to 7 % and usually 3 to 5 %, as well as added process liquid, usually water.
- a pulp preparation includes a so called pulper where a fibre material from a cellulose process is resolved during decomposition and agitation, and mixed with process water.
- Traditional papermaking includes a process where a pulp mass which essentially comprises a fibre material and process liquid is conducted via a headbox for de-watering on a wire. A multitude of further steps and arrangements are associated to the process, including vessels where the consistency typically is 3 to 5 %, whereby much surplus liquid is conducted in an upstream direction back into the process.
- a traditional process includes a recovering by means of, e.g., flotation in recovering devices, after which the clear water from the flotation is recycled in the pulp preparation.
- titanium dioxide will lose in optical effect, and yet a part will be lost in the form of, for example, deposition in the system. Additionally, there are, of course, the drawbacks caused by separate arrangements for fibre recovery, costs of investments and operating and costs depending on a contamination and cleaning of the systems, as well as the more complicated process chemistry which a recovery in line with prior art requires.
- the object of the present invention is to avoid the drawbacks which until now have been connected to the use of pigments and especially in connection with a change of the paper grade.
- the present invention is based on the astonishing realization that by raising the consistency of the pulp at an early stage of the process it is, in practice, possible to cut the arrangement which in traditional papermaking is called the long circulation, i.e. a circulation system where white water in accordance with traditional arrangements can run from the wire pit of the paper machine upstream in the system up to the point where pulp is added, for example to a pulper.
- the long circulation i.e. a circulation system where white water in accordance with traditional arrangements can run from the wire pit of the paper machine upstream in the system up to the point where pulp is added, for example to a pulper.
- a flow of valuable additional agents directed upstream can be prevented, for example a flow of titanium dio ' xide and other pigments which otherwise partially would be lost and partially contaminate the whole chain of process .
- the method according to the present invention is characterized in that the consistency of the pulp is increased, prior to the introduction of said additional agent and suitably at a separate process stage, to a value of more than 10% by removing process liquid, in that this process liquid is conveyed upstream in the process, while compensating process liquid, which suitably can contain additional agents, is added downstream in the direction of the process.
- a process according to the present invention is characterized in that separating means are arranged prior to the means for introducing the additional agent, seen in the direction of the process, but after said inlet, whereby these separating means are arranged to separate process liquid from the flowable pulp so that the consistency of the pulp will increase to a value of more than 10%, in some cases favorably even up to 50%.
- the arrangement further includes means for conveying the liquid which has been separated from the process liquid in an upstream direction in the process, as well as means for a downstream introduction of process liquid from said circulation in order to compensate the separated process liquid.
- This latter process liquid can, as such, contain more or less additional agent (s) .
- Figure 1 as a principle drawing discloses an arrangement ac ⁇ cording to one embodiment of the present invention
- Figure 2 generally discloses a paper machine arrangement in accordance with an especially favorable embodiment.
- a paper machine typically includes an inlet for a fiber containing material, i.e. cellulose which usually is provided in the form of dry sheets or, at so called integrated plants, directly from a cellulose plant in the form of a fibre containing process liquid.
- a fiber containing material i.e. cellulose which usually is provided in the form of dry sheets or, at so called integrated plants, directly from a cellulose plant in the form of a fibre containing process liquid.
- a pulp preparation including a so called pulper 2 where the sheets are disintegrated and mixed with process water, for example from a tank 3, to constitute a so called stock or papermaking pulp.
- the pulp passes through different process stages 4a, 4b, 4c, 4d, 4e ... which in this context are essentially ir ⁇ relevant, and finally it is spread via the paper machine's headbox 5 onto a wire 6.
- the wire runs through a machinery 7 where the process liquid to an extensive portion is exhausted by suction in the form of so called white water, while the moist remaining pulp
- the white water also to some degree contains chemicals that will do be retained in the paper. These chemicals follow with the process water which to some parts is used in the so called short circulation for dilution purposes at such process stages where said chemicals are needed as such, or where they in any case cause only minor harm.
- White water used for other purposes is cleaned in different processes and cleaning stages, on one hand to recover the chemicals and, on the other hand, to obtain a clean water which can be used in other parts of the process. Each such cleaning process, is, however, to some extent incomplete and additionally requires both energy, time and apparatus .
- the system according to the present invention differs essentially from the known technology described above.
- a separation has only been adopted in order to prevent chemicals that disturb lower processes from flowing downwards, while the idea is quite new that a prevention of valuable additive agents from contaminating upstream also may be realized in a corresponding manner.
- the removing separation of process liquid is favorably effected by means of such a thickening technique which is known per se from, for example, production of cellulose, bleaching and de-inking.
- a thickening technique which is known per se from, for example, production of cellulose, bleaching and de-inking.
- Such arrangements are usually capable of increasing the consistency of the fibre containing pulp mass from an initial value of 2 to 10%, in the present case typically in the order of about 4 to 6%, to a final value of even up to 50% and possibly even higher.
- the separation is performed by means of a pressing which favorably takes place prior to a beating 4c.
- the pressing at the thickening favorably then takes place in a screw or band press 8a of a type known per se, so that the slushed pulp after pressing obtains a dry matter content of ⁇ more than 10%, especially within an interval of 20 to 50%, suitably 25 to 40%, favorably at least 30%.
- the process liquid which is separated during the pressing is conveyed 11 back in the upstream direction into the process, suitably back to the pulper 2.
- the liquid which has been separated from the process is suitably replaced 13 in a dispersing device 12 with an essentially corresponding amount of liquid taken from the circulation of the paper machine.
- a dispersing device 12 with an essentially corresponding amount of liquid taken from the circulation of the paper machine.
- this takes place in an arrangement according to the applicants international patent application No PCT/FI99/00143, or alternatively by means of a screw arrangement or a mixer of some other type.
- the dispersing device 12 is favorably arranged in the process direction essentially directly behind the separation 8, 8a.
- the main introduction 14 of critical added agents such as very expensive pigments and coloring agents takes place in con ⁇ nection with the addition of liquid to the dispersing device 12 (see Figure 2) , which provides an effective intermixing of the additional agents in as early a stage as possible after the concentration.
- Figure 2 shows that additional agents also can be introduced 14a, 14b at later stages in the process. Since the introduction of at least a part of the additional agent (s) favorably takes place at the same time as the introduction 13 of replacing liquid it is of little consequence if the replacing liquid is taken from such a part of the process where the residual content of additional agent (s) could be even high.
- this concentration can be reduced by arranging a suction box 15 under the wire at such a point where a fibre web already has been formed, so that the fibre web functions as a filter.
- This suction box 15 is worked by a light vacuum whereby a careful filtration and a very clean white water is achieved. This filtration reduces the amount of material so that this white water normally can be conducted 16 to an overflow 17 without any need for any additional recovering.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL05761319T PL1766135T3 (en) | 2004-06-28 | 2005-06-28 | A method and an arrangement at a paper machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20040884A FI116575B (en) | 2004-06-28 | 2004-06-28 | Paper Machine Method and Arrangement |
PCT/FI2005/050246 WO2006000649A1 (en) | 2004-06-28 | 2005-06-28 | A method and an arrangement at a paper machine |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1766135A1 true EP1766135A1 (en) | 2007-03-28 |
EP1766135A4 EP1766135A4 (en) | 2012-11-28 |
EP1766135B1 EP1766135B1 (en) | 2014-03-19 |
Family
ID=32524552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05761319.2A Active EP1766135B1 (en) | 2004-06-28 | 2005-06-28 | A method and an arrangement at a paper machine |
Country Status (8)
Country | Link |
---|---|
US (1) | US20080257509A1 (en) |
EP (1) | EP1766135B1 (en) |
JP (1) | JP4828528B2 (en) |
CN (1) | CN1997794B (en) |
ES (1) | ES2458297T3 (en) |
FI (1) | FI116575B (en) |
PL (1) | PL1766135T3 (en) |
WO (1) | WO2006000649A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999034057A1 (en) * | 1997-12-24 | 1999-07-08 | Kimberly-Clark Worldwide, Inc. | Paper products and methods for applying chemical additives to cellulosic fibers |
WO1999038021A1 (en) * | 1998-01-27 | 1999-07-29 | Honeywell-Measurex Corporation | Fast cd and md control in a sheetmaking machine |
WO1999064673A1 (en) * | 1998-06-12 | 1999-12-16 | Fort James Corporation | Method of making a paper web having a high internal void volume of secondary fibers and a product made by the process |
WO2000022232A1 (en) * | 1998-10-14 | 2000-04-20 | The Mead Corporation | Colorant application on the wet end of a paper machine |
US20020131325A1 (en) * | 1998-02-26 | 2002-09-19 | Jouni Matula | Method and apparatus for feeding a chemical into a liquid flow |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB315229A (en) * | 1928-07-09 | 1931-01-09 | British Arca Regulators Limited | |
US3342921A (en) * | 1966-03-16 | 1967-09-19 | West Virginia Pulp & Paper Co | Process for producing fibrous filler having high wet end retention |
US3794558A (en) * | 1969-06-19 | 1974-02-26 | Crown Zellerbach Corp | Loading of paper furnishes with gelatinizable material |
SE420329C (en) * | 1978-02-16 | 1984-07-10 | Mo Och Domsjoe Ab | PROCEDURE FOR THE PREPARATION OF GRINDING PAPER |
FI89728C (en) * | 1992-05-19 | 1993-11-10 | Pom Dev Oy Ab | PROCEDURE FOR THE CIRCULATION OF PROCESS VATTNET I EN PAPER MACHINERY |
FI97332B (en) * | 1993-12-23 | 1996-08-30 | Pom Technology Oy Ab | Apparatus and method for pumping and separating a mixture of gas and liquid |
AU4541096A (en) * | 1996-01-25 | 1997-08-20 | Pom Technology Oy Ab | Apparatus and process for feeding stock to a papermachine |
US6113741A (en) * | 1996-12-06 | 2000-09-05 | Eka Chemicals Ab | Process for the production of paper |
US5779859A (en) * | 1996-12-13 | 1998-07-14 | J.M. Huber Corporation | Method of improving filler retention in papermaking |
US6423183B1 (en) * | 1997-12-24 | 2002-07-23 | Kimberly-Clark Worldwide, Inc. | Paper products and a method for applying a dye to cellulosic fibers |
FI105111B (en) * | 1998-02-24 | 2000-06-15 | Pom Technology Oy Ab | Method and apparatus for treating fluid mass |
FI105118B (en) * | 1999-05-12 | 2000-06-15 | Valmet Corp | Method for manufacture of paper or cardboard web and a paper or cardboard making machine |
FI20000938A0 (en) * | 2000-04-19 | 2000-04-19 | Pom Technology Oy Ab | Procedure and arrangement for suction elements |
MXPA01005678A (en) * | 2000-06-07 | 2003-08-20 | Kimberly Clark Co | Paper products and methods for applying chemical additives to fibers in the manufacture of paper. |
FI115081B (en) * | 2001-10-19 | 2005-02-28 | Metso Automation Oy | Method and apparatus for controlling the operation of a pulp department of a paper machine |
US6993871B2 (en) * | 2003-03-17 | 2006-02-07 | Gutter Pro Usa Llc | Gutter cover having a unique interlocking bracket |
-
2004
- 2004-06-28 FI FI20040884A patent/FI116575B/en active IP Right Grant
-
2005
- 2005-06-28 JP JP2007517324A patent/JP4828528B2/en active Active
- 2005-06-28 CN CN2005800216541A patent/CN1997794B/en active Active
- 2005-06-28 WO PCT/FI2005/050246 patent/WO2006000649A1/en active Application Filing
- 2005-06-28 US US11/631,000 patent/US20080257509A1/en not_active Abandoned
- 2005-06-28 ES ES05761319.2T patent/ES2458297T3/en active Active
- 2005-06-28 PL PL05761319T patent/PL1766135T3/en unknown
- 2005-06-28 EP EP05761319.2A patent/EP1766135B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999034057A1 (en) * | 1997-12-24 | 1999-07-08 | Kimberly-Clark Worldwide, Inc. | Paper products and methods for applying chemical additives to cellulosic fibers |
WO1999038021A1 (en) * | 1998-01-27 | 1999-07-29 | Honeywell-Measurex Corporation | Fast cd and md control in a sheetmaking machine |
US20020131325A1 (en) * | 1998-02-26 | 2002-09-19 | Jouni Matula | Method and apparatus for feeding a chemical into a liquid flow |
WO1999064673A1 (en) * | 1998-06-12 | 1999-12-16 | Fort James Corporation | Method of making a paper web having a high internal void volume of secondary fibers and a product made by the process |
WO2000022232A1 (en) * | 1998-10-14 | 2000-04-20 | The Mead Corporation | Colorant application on the wet end of a paper machine |
Non-Patent Citations (1)
Title |
---|
See also references of WO2006000649A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20080257509A1 (en) | 2008-10-23 |
FI116575B (en) | 2005-12-30 |
JP2008504449A (en) | 2008-02-14 |
CN1997794B (en) | 2012-03-21 |
JP4828528B2 (en) | 2011-11-30 |
EP1766135A4 (en) | 2012-11-28 |
CN1997794A (en) | 2007-07-11 |
ES2458297T3 (en) | 2014-04-30 |
EP1766135B1 (en) | 2014-03-19 |
PL1766135T3 (en) | 2014-08-29 |
WO2006000649A1 (en) | 2006-01-05 |
FI20040884A0 (en) | 2004-06-28 |
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