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WO2003057981A1 - Systeme de traitement de casses pour machine a papier ou machine a voile fibreux analogue - Google Patents

Systeme de traitement de casses pour machine a papier ou machine a voile fibreux analogue Download PDF

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Publication number
WO2003057981A1
WO2003057981A1 PCT/FI2002/001026 FI0201026W WO03057981A1 WO 2003057981 A1 WO2003057981 A1 WO 2003057981A1 FI 0201026 W FI0201026 W FI 0201026W WO 03057981 A1 WO03057981 A1 WO 03057981A1
Authority
WO
WIPO (PCT)
Prior art keywords
broke
paper machine
collecting means
conveying
tower
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.)
Ceased
Application number
PCT/FI2002/001026
Other languages
English (en)
Inventor
Jouko Hautala
Antti Lukka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Priority to AT0927002A priority Critical patent/AT501331B1/de
Priority to AU2002350786A priority patent/AU2002350786A1/en
Priority to DE10297530T priority patent/DE10297530T5/de
Publication of WO2003057981A1 publication Critical patent/WO2003057981A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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

Definitions

  • the present invention relates to a broke system for a paper machine or an equiva- lent fibrous web machine, particularly for the wet end of a fibrous web machine, in which the dry solids content of the web is ⁇ 60 % and which comprises at least a forming section and a press section and advantageously part of a drying section.
  • a paper machine or a corresponding fibrous web machine refers in this applica- tion to a paper, board or soft tissue machine or a chemical pulp dryer.
  • broke At the wet end of a paper machine broke generally discharges from several broke discharge points, e.g. in the wire section i.e. the forming section during trimming, in connection with web breaks in the press section and at the beginning of the dry- ing section, in open draws between different sections of the paper machine and generally when the web is not supported from below.
  • Known broke systems have the principle of mixing the broke with water in a pulper located under the paper machine so that the consistency of the stock formed is typically about 3 %. After this the stock is pumped into a broke tower, from where it is taken back to the paper machine either as part of the stock or, in an extreme situation, broke alone is used.
  • the broke is typically disintegrated at the production rate of the machine in a pulper located under the machine to a pumpable consistency, which is normally in the range of 4...5 %.
  • the disintegrated stock is normally pumped via the pulper of the wire section into the broke tower and the trim broke from the wire section is normally pumped in continuous operation via a broke thickener into the broke tower or a thickener.
  • Coated broke, containing coating-derived ash, the amount of which in the paper is desired to be controlled, is kept separate from the base paper broke and stored in a broke tower of coated paper. The broke is screened for in- stance due to poor disintegrability of coated broke.
  • the screening can be performed on all broke, whereby, in order to control the ash amount coming from the broke into the base paper, uncoated and coated broke are first proportioned into a broke dosage chest, from where they are pumped via screening to stock dosage.
  • a broke dosage chest Before dosage to the paper machine the broke is thickened with a gravity thickener, which may be located in the base broke main line or as a separate thickening circulation in connection with the broke tower. Broke is usually dosed to a paper machine in an amount of 5...20 % of the machine's output.
  • the dosage may, at times, be up to 50...60 % of the machine's production.
  • a substantial problem related to known broke systems is that it is not possible to make the use of broke take place at the best possible time regarding the production. Problematic are also big broke towers, the large water volume of the broke system and time delays affecting the production. As to problems it can also be stated that since the broke occurring at the wet and dry end of the paper machine is caused by running problems related to pulp properties or chemistry, it would be most advantageous to run the paper machine with fresh pulps. This, however, is not possible if the broke cannot be recovered. In addition to running problems the provision for broke increases costs, since storage chests and dilution water tanks have to be built for storing broke. What is more, paper pulp does not keep for a long period of time at chest consistency and, on the other hand, the chests should be emptied as quickly as possible to maintain preparedness for dealing with the next break.
  • the main object of the present invention is to provide, particularly for the wet end of the paper machine, a novel broke system with which the above-mentioned problems and disadvantages related to traditional broke systems could be eliminated or at least essentially reduced. It is a special object of the present invention to reduce the mixing of broke with water.
  • a further object according to an additional aspect of the present invention is to do away with the need to use a pulper and to provide broke pre-treatment by means of which all broke from the wet end of the machine can be passed into a broke tower at a constant consistency and after that be disintegrated and diluted in the broke tower to a pumping consistency, which is usually 4...5 %.
  • the broke system arranged between a broke discharge point and a broke tower, comprises: at least one set of collecting means arranged below a paper machine or the like for receiving broke from broke discharge points, a broke conveying line for receiving and conveying broke from each broke collecting means and for transporting it either directly or via an intermediate conveyor away from the broke conveying line.
  • the broke conveying line extends, according to an advantageous embodiment of the invention, at least over the length of the wet end of the paper machine and discharges the broke either directly or via an intermediate conveyor into the broke tower.
  • the broke tower can, what comes to the operativeness of the invention, be placed freely; it is, however, advantageous to place it near the paper machine.
  • each collecting means comprises at least one conveying means for moving the broke discharging from the broke discharge point below and to the middle of the paper machine or to one or both sides of the machine.
  • dilution water is mixed with the broke so that the consistency of the broke is diluted to a range of 6-20%, preferably to a range of 10-15 %, at which consistency the broke conveying line or the intermediate conveyor discharges the diluted wet broke into the broke tower.
  • the dilution water is in that case taken from a first dilution water pipe.
  • the dilution water can, according to the invention, be also fed directly into the broke tower.
  • the conveying means belonging to the collecting means comprises two parts so that the centre lines, parallel to the transport direction of broke, of the parts of the conveying means run at a right angle to or obliquely crosswise relative to the MD direction.
  • the set of collecting means then discharges the broke through ends facing each other onto the broke conveying line located in the middle of the paper machine or the like or through ends facing away from each other onto the broke conveying lines located on the sides of the paper machine or the like.
  • the conveying means belonging to the collecting means comprises one part so that its centre line in the transport direction of broke runs at a right angle to or obliquely crosswise relative to the MD direction.
  • the broke conveying line being a belt conveyor or the like, transports the wet brokes to the intermediate conveyor, being a screw conveyor that mixes wet broke and dilution water.
  • the conveying means of the collecting means are screw conveyors.
  • each collecting means comprises mechanical broke disintegration means disposed before the conveying means belonging to the collecting means, a broke re- ceiving vessel or tank, having an open upper part and comprising a continuous edge part and a slide bottom part, which is funnel-like and/or obliquely slanting towards the mechanical broke disintegration means, the slide bottom part comprising an outlet through which the broke falls onto the conveying means of the broke collecting means.
  • the mechanical broke disintegration means consist of a pair of broke-shredding or -tearing rolls, in which pair of rolls the axes of the rolls are at a right angle to or at an oblique angle to the MD direction and in which the outer surface of at least one roll is broke-cutting or -tearing in order to cut the broke advantageously into flake-like pieces.
  • the mechanical broke disintegration means consist of water sprays.
  • the amount of dilution water to be passed to the conveying means of the collecting means or to the intermediate conveyor is determined according to the invention, and thus the control of the broke system is based on the position and width information of the broke at the broke discharge point.
  • the advantages of the invention include that it is possible to use the broke pro- **d in the paper machine at a time when it is sensible from the viewpoint of the runnability of the paper machine and/or the paper grade, and that the shredding device included in the broke system according to the invention makes the handling of broke easier and quicker. Thanks to the possibility of using fresh pulp running problems can be solved more promptly, thus significantly increasing the efficiency of the paper machine. If desired, it is possible to place the broke system according to the invention in a low cellar space, and the paper machine does not need large broke towers, meaning that the costs become lower and the broke system is substantially more compact compared to traditional broke systems.
  • the control of the broke system according to the invention can also be carried out more rapidly and precisely thanks to smaller pulp quantities and continuous operation.
  • the invention also opens up the possibility of using the produced broke as raw material in another paper machine or the like.
  • FIG.1 schematically shows a broke system according to the invention for handling broke at the wet end of the paper machine
  • FIG.2 schematically shows an advantageous embodiment of the collecting means of the broke system
  • FIG.3 schematically shows another advantageous embodiment of the collecting means of the broke system.
  • Figure 1 illustrates the broke system according to the invention at the wet end of a paper machine for receiving broke from broke discharge points and for conveying the broke to a broke tower 6.
  • broke discharge points are represented in Figure 1 by a broke discharge point between a forming section i.e. wire section WS and a first press unit PSl of a press section; and a broke discharge point between the first press unit PSl and a second press unit PS2 of the press section or a broke discharge point between the first press unit PSl of the press section and a drying section DS.
  • broke is produced e.g.
  • the broke system according to the invention is arranged below the paper machine in connection with the forming section WS, the first press unit PSl of the press section following it and the second press unit PS2 of the press section or the beginning of the drying section DS.
  • the dry solids content of the web after the forming section is normally ⁇ 20 %, typically between 10 and 20 %. It is common for a paper machine to have, in the forming section, a broke dropping shower, in which case the consistency of the broke is about 10 %.
  • the dry solids content is usually ⁇ 60 %, typically between 40 and 55 %.
  • the broke system comprises a first set of broke collecting means 1 arranged below the end of the forming section WS and a second set of collecting means 2 arranged below the press section PSl, PS2.
  • the collecting means 1, 2 discharge the broke onto a broke conveying line 3 extending substantially over the length of the wet end of the paper ma- chine WS, PSl, PS2/DS.
  • the broke conveying line 3 in turn discharges the broke at the end of the broke conveying line 3 onto an intermediate broke conveyor 4.
  • the broke is mixed with dilution water from a first dilution water pipe 5, after which the wet broke diluted to the desired consistency, which is between 6 and 20 %, preferably between 10 and 15 %, is passed into the broke tower 6.
  • dilution water can, according to the invention, also be passed directly into the broke tower.
  • the wet broke is disintegrated and diluted in a bottom part 9 of the broke tower 6 with dilution water fed via a second dilution water pipe 7 to a pumping consistency, which is typically about 4-5 %.
  • a pumping consistency typically about 4-5 %.
  • the wet broke to be pumped out of an outlet pipe of the bottom part 9 of the broke tower 6 is diluted further via a third dilution water pipe 8 so that a consistency suited for stock, about 3 %, is obtained.
  • Dilution water suited for the first, second and third dilution water pipes 5, 7 and 8 is advantageously taken from a filtrate water tower.
  • the first set of broke collecting means 1 extends in the running direction of the web, i.e. in the MD direction, backwards below the forming section WS and in the
  • the second set of broke collecting means 2 also extends in the MD direction backwards below the press section PSl, PS2 and in the CD direction transverse to the MD direction over the width of the paper machine.
  • Both collecting means 1, 2 comprise advantageously at least one conveying means, e.g. a belt conveyor or the like, enabling the receiving of broke of the width of the paper machine web and passing the broke to after-treatment in the broke system according to the invention.
  • Both collecting means 1, 2 may alterna- tively comprise at least one screw conveyor or the like enabling the receiving of broke of the width of the paper machine web and passing the broke to after- treatment in the broke system according to the invention.
  • an object is to transport the broke discharging from the broke discharge point with the collecting means 1, 2 below and to the middle of the paper machine or, provided there is enough space in the machine hall, from under the machine to both sides or only one side of the machine.
  • a conveying means 11 belonging to the collecting means 1 , 2 comprises two parts such that the centre lines, parallel to the transport direction of broke, of the parts of the conveying means 11 run at a right angle to or obliquely crosswise relative to the MD direction, the parts of the conveying means discharging the broke - via its ends facing each other, via its ends facing away from each other onto the broke conveying line 3 located in the middle of the machine or correspondingly onto broke conveying lines 3 on the sides of the machine.
  • the conveying means belonging to the collecting means 1, 2 can comprise one part so that its centre line, in the transport direction of broke, runs at a right angle to or obliquely crosswise relative to the MD direction.
  • broke conveying line 3 advantageously being a belt, a compartment or equivalent conveyor suited for conveying broke.
  • the broke conveying line 3 and its transport direction advantageously extend at least from the end of the press section PSl, PS2 or from the beginning of the drying section DS in a direction opposite to the MD direction past the beginning of the forming section WS of the paper machine.
  • the broke can be passed directly into the broke storage tower 6 below the end of the broke conveying line 3.
  • the end of the broke conveying line 3 extends, however, above the intermediate broke conveyor 4, whereby, at the end of the broke conveying line 3, the broke is passed onto the intermediate broke conveyor
  • dilution water is mixed in the intermediate conveyor 4 with the wet broke, which dilution water can be pumped e.g. from the filtrate water tower (not shown in the figure) via the dilution water pipe 5, whereby the consistency i.e. dry solids content of the wet broke can be diluted to a range of 6-20%, preferably to a range of 10-15%.
  • the intermediate broke conveyor 4 is, for example, a broke-mixing screw conveyor.
  • dilution water can be passed directly into the broke tower 6 to stabilize the consistency in the broke tower to a range of 6-20 %, preferably to a range of 10-15 %.
  • the feed volume of dilution water can thus be determined quickly and precisely to the desired consistency, i.e. 6-20 %, preferably 10-15 %, in order to produce diluted wet broke in the conveying means 11 of the collecting means 1, 2 or in the intermediate conveyor 4, whereby the wet broke diluted to the desired consistency can be fed into the broke tower 6.
  • the mechanical broke disintegration means 12 advantageously comprise a pair of broke-shredding or -tearing rolls, in which pair of rolls the axes of the rolls are at a right angle or an oblique angle to the MD direction and in which the outer surface of at least one roll is broke-cutting or -tearing in order to cut the broke advantageously into flake-like pieces.
  • the broke collecting means 1, 2 also comprise a broke receiving vessel 13, having an open upper part and comprising a continuous edge part 14 and a slide bottom part 15, which is funnellike and/or obliquely slanting towards the mechanical broke disintegration means 12, the slide bottom part comprising an outlet 16 through which the broke falls onto the conveying means 11 belonging to the broke collecting means 1, 2.
  • FIG. 3 illustrates one such embodiment.
  • the conveying means 11 advantageously being a screw conveyor
  • the water volume used for tearing the web can be adjusted so that it is no longer necessary to feed dilution water 5 or to arrange an intermediate conveyor 4, such as a screw conveyor between the broke conveying line 3 and the broke tower 6.
  • an intermediate conveyor 4 such as a screw conveyor between the broke conveying line 3 and the broke tower 6.

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Abstract

L'invention concerne un système de traitement de cassés pour machine à papier ou analogue, en particulier pour la partie humide d'une machine à papier, dans laquelle la teneur en éléments solides du voile est <60 %, cette machine comprenant au moins une partie de formation (WS), une partie de presse (PS1, PS2) et avantageusement le début d'une partie de séchage (DS). Le système de traitement de cassés selon l'invention est disposé entre un point de décharge de cassés et une colonne de cassés, ce système de traitement de cassés comprenant au moins un moyen de collecte (1, 2) disposé en dessous de la machine à papier pour recevoir les cassés; une ligne de transport de cassés (3) servant à transporter les cassés au-delà de la partie de formation (WS), jusqu'au début de la machine à papier ou analogue; et une colonne de cassés (6) destinée à recevoir les cassés directement ou par un transporteur intermédiaire (4), à partir de la ligne de transport de cassés (3).
PCT/FI2002/001026 2001-12-19 2002-12-16 Systeme de traitement de casses pour machine a papier ou machine a voile fibreux analogue Ceased WO2003057981A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT0927002A AT501331B1 (de) 2001-12-19 2002-12-16 Ausschusssystem für eine papiermaschine oder eine gleichwertige maschine für faserbahnen
AU2002350786A AU2002350786A1 (en) 2001-12-19 2002-12-16 Broke system for a paper machine or an equivalent fibrous web machine
DE10297530T DE10297530T5 (de) 2001-12-19 2002-12-16 Ausschusssystem für eine Papiermaschine oder eine gleichwertige Maschine für Faserbahnen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20012513A FI120551B (fi) 2001-12-19 2001-12-19 Paperikoneen tai vastaavan hylkyjärjestelmä
FI20012513 2001-12-19

Publications (1)

Publication Number Publication Date
WO2003057981A1 true WO2003057981A1 (fr) 2003-07-17

Family

ID=8562522

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/001026 Ceased WO2003057981A1 (fr) 2001-12-19 2002-12-16 Systeme de traitement de casses pour machine a papier ou machine a voile fibreux analogue

Country Status (5)

Country Link
AT (1) AT501331B1 (fr)
AU (1) AU2002350786A1 (fr)
DE (1) DE10297530T5 (fr)
FI (1) FI120551B (fr)
WO (1) WO2003057981A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116770609A (zh) * 2023-08-01 2023-09-19 湖北华海纤维科技股份有限公司 用于损纸的破碎处理系统及工艺

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236723A (en) * 1963-05-07 1966-02-22 Improved Machinery Inc Sheet material reprocessing apparatus for paper broke
US3773613A (en) * 1971-10-13 1973-11-20 Int Paper Co Method for converting plastic-containing broke to fluff
KR0160811B1 (ko) * 1993-09-29 1999-01-15 가메다카 소키치 고지의 건식해섬방법 및 그 장치
WO2001073194A1 (fr) * 2000-03-24 2001-10-04 Jlr Pulping Systems Ab Pulpeuse permettant de produire de la pate a papier a partir dechets de papier
US20010037866A1 (en) * 2000-04-13 2001-11-08 Voith Paper Patent Gmbh Process for dispersing a fibrous paper stock and device for performing the process
US6358367B1 (en) * 2000-02-01 2002-03-19 Voith Sulzer Paper Technology North America, Inc. Pulping system for a paper machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236723A (en) * 1963-05-07 1966-02-22 Improved Machinery Inc Sheet material reprocessing apparatus for paper broke
US3773613A (en) * 1971-10-13 1973-11-20 Int Paper Co Method for converting plastic-containing broke to fluff
KR0160811B1 (ko) * 1993-09-29 1999-01-15 가메다카 소키치 고지의 건식해섬방법 및 그 장치
US6358367B1 (en) * 2000-02-01 2002-03-19 Voith Sulzer Paper Technology North America, Inc. Pulping system for a paper machine
WO2001073194A1 (fr) * 2000-03-24 2001-10-04 Jlr Pulping Systems Ab Pulpeuse permettant de produire de la pate a papier a partir dechets de papier
US20010037866A1 (en) * 2000-04-13 2001-11-08 Voith Paper Patent Gmbh Process for dispersing a fibrous paper stock and device for performing the process

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200037, Derwent World Patents Index; Class F09, AN 1995-132334, XP002959087 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116770609A (zh) * 2023-08-01 2023-09-19 湖北华海纤维科技股份有限公司 用于损纸的破碎处理系统及工艺
CN116770609B (zh) * 2023-08-01 2024-03-15 湖北华海纤维科技股份有限公司 用于损纸的破碎处理系统及工艺

Also Published As

Publication number Publication date
FI20012513A0 (fi) 2001-12-19
AU2002350786A1 (en) 2003-07-24
DE10297530T5 (de) 2004-11-18
FI120551B (fi) 2009-11-30
AT501331A1 (de) 2006-08-15
FI20012513L (fi) 2003-06-20
AT501331B1 (de) 2006-11-15

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