EP1950345B1 - Papierherstellungsverfahren und papierherstellungssystem - Google Patents

Papierherstellungsverfahren und papierherstellungssystem Download PDF

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Publication number
EP1950345B1
EP1950345B1 EP06822028.4A EP06822028A EP1950345B1 EP 1950345 B1 EP1950345 B1 EP 1950345B1 EP 06822028 A EP06822028 A EP 06822028A EP 1950345 B1 EP1950345 B1 EP 1950345B1
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EP
European Patent Office
Prior art keywords
paper
viscous agent
pulp slurry
papermaking
polyethylene oxide
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.)
Expired - Fee Related
Application number
EP06822028.4A
Other languages
English (en)
French (fr)
Other versions
EP1950345A1 (de
EP1950345A4 (de
Inventor
Masaki SUMITOMO SEIKA CHEMICALS CO. LTD. TERAMOTO
Shinji SUMITOMO SEIKA CHEMICALS CO. LTD. KOBAYASHI
Kenji SUMITOMO SEIKA CHEMICALS CO. LTD. WADA
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.)
Sumitomo Seika Chemicals Co Ltd
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Sumitomo Seika Chemicals Co Ltd
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Publication date
Application filed by Sumitomo Seika Chemicals Co Ltd filed Critical Sumitomo Seika Chemicals Co Ltd
Publication of EP1950345A1 publication Critical patent/EP1950345A1/de
Publication of EP1950345A4 publication Critical patent/EP1950345A4/de
Application granted granted Critical
Publication of EP1950345B1 publication Critical patent/EP1950345B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • D21H21/06—Paper forming aids
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/53—Polyethers; Polyesters
    • 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

Definitions

  • the present invention relates to a method and a system for performing papermaking using a paper machine provided with a head box including a manifold having a cell-structure.
  • a paper manufacturing process includes a pulp step for forming a material pulp slurry and a papermaking step for making paper from the pulp slurry.
  • a material pulp slurry is prepared by forming chips from wood and performing digestion, cleaning, picking, bleaching and so on.
  • the material pulp slurry is supplied from a head box onto a wire element for dewatering, and then processes such as pressing and drying are performed to produce paper.
  • a viscous agent for dispersing pulp is generally used.
  • polyethylene oxide may be used as the viscous agent.
  • an aqueous solution of polyethylene oxide having the concentration of not more than 0.01 wt % and appropriate viscosity may be added to the material pulp slurry. Owing to the pulp dispersion effect of the viscous agent added in the papermaking process, paper in which pulp fibers is uniformly dispersed and which has excellent formation is obtained.
  • Paper machines such as a Fourdrinier machine, a “tanmo” machine, a twin wire machine and a crescent former (hereinafter, these machines are referred to as "high-speed paper machines"), which have been developed to achieve a productivity higher than that of a cylinder machine and whose papermaking speed (wire traveling speed) is relatively high, include a manifold having a cell-structure and provided in a head box. In these machines, therefore, when the material pulp slurry passes through the manifold, a large shearing force is applied to the material pulp slurry, whereby the slurry is mechanically dispersed. Thus, by using a high-speed paper machine, low-basis-weight paper having excellent formation is obtained without using a viscous agent.
  • Patent Document 1 JP-A 2000-290892
  • An object of the present invention which is proposed in view of the above-described problems of the prior art, is to provide a papermaking method and a papermaking system capable of making paper having excellent formation even by the use of a high-speed paper machine by optimizing the concentration of a viscous agent solution to be added to the material pulp slurry.
  • the inventors of the present invention have studied changes in viscosity of aqueous solution of polyethylene oxide caused by shearing to find that the viscosity is hardly degraded by shearing when the aqueous solution has a concentration higher than a predetermined value. By applying this result of the studies to papermaking, the inventors have found that paper having excellent formation is obtained even by the use of a high-speed paper machine and achieved the present invention.
  • a method of making paper using a paper machine provided with a head box including a manifold having a cell-structure comprising the steps of:
  • the use of a proper viscous agent reduces the defects such as the breakage of paper due to insufficient dispersion of pulp fibers, and hence, stable papermaking is possible.
  • the yield of papermaking is enhanced, and the production efficiency is improved.
  • the addition of the aqueous solution of the viscous agent is performed between the head box and a screen located closest to the head box. In this case, the pulp dispersion effect by the viscous agent is properly exhibited.
  • the viscous agent is a polyethylene oxide.
  • the viscous agent comprises solely of polyethylene oxide.
  • a papermaking system comprising
  • the viscous agent is polyethylene oxide.
  • Fig. 1 schematically shows a papermaking system X1 used for a papermaking method according to the present invention.
  • the papermaking system X1 mainly comprises a pump 1, a screen 2, a head box 3 and a piping connecting these members to each other for making paper from a material pulp slurry S by the papermaking method.
  • the pump 1 supplies the material pulp slurry S formed in a pulping step and containing pulp fibers to the screen 2 at a predetermined pressure.
  • the screen 2 removes impurities from the material pulp slurry S and makes the thickness of the material pulp slurry S uniform.
  • the material pulp slurry S passes through an extremely narrow space under a contact pressure from a non-illustrated roller. Thus, a relatively large shearing force is applied to the pulp fibers contained in the material pulp slurry S.
  • the head box 3 which constitutes part of a paper machine, serves to eject a mixed pulp slurry MS onto a wire element 4 traveling endlessly.
  • the mixed pulp slurry MS is obtained by adding a viscous agent P (which will be described later) to the material pulp slurry S.
  • the head box 3 includes a manifold 30 having a cell-structure made up of a plurality of pipes 31. By causing the mixed pulp slurry MS to flow through the manifold 30, the pulp fibers contained in the mixed pulp slurry MS are dispersed.
  • Each of the pipes 31 includes an introduction end 31a and a discharge end 31b, and the cross sectional area of each pipe increases stepwise as progressing from the introduction end 31a toward the discharge end 31b.
  • Examples of paper machine including a manifold like the manifold 30 include a crescent former, a twin wire paper machine and a Fourdrinier machine, which are high-speed paper machines whose papermaking speed is relatively high.
  • the head box 3 includes a discharge opening 3a on the downstream side of the manifold 30.
  • the mixed pulp slurry MS discharged from the manifold 30 is ejected onto the wire element 4 through the discharge opening 3a.
  • the discharge opening 3a is tapered toward the downstream side.
  • the screen 2 and the head box 3 are connected to each other via a pipe 21.
  • a pipe 22 for adding a viscous agent solution M is connected to the pipe 21.
  • An example of viscous agent solution M to be added is polyethylene oxide-based aqueous solution.
  • the material pulp slurry S is supplied to the screen 2 by the operation of the pump 1.
  • the material pulp slurry S having passed through the screen 2 is introduced into the pipe 21.
  • An aqueous solution of polyethylene oxide as the viscous agent solution M is added to the material pulp slurry S through the pipe 22.
  • the aqueous solution is prepared in advance to have a polyethylene oxide concentration in the range of 0.03 to 0.4 wt %.
  • the aqueous solution of polyethylene oxide may be prepared by dissolving powder of polyethylene oxide in water contained in a bath made of stainless steel while stirring the water using a stirrer provided at the bath.
  • the material pulp slurry S and the viscous agent solution M are mixed within the pipe 21 to form the mixed pulp slurry MS, and the mixed pulp slurry MS is supplied to the head box 3.
  • the mixed pulp slurry MS is introduced into the manifold 30 (the pipes 31). Since the cross sectional area of each pipe 31 is relatively small at a portion adjacent to the introduction end 31a, the mixed pulp slurry MS flows through this portion at a relatively high speed. Since the cross sectional area of the pipe increases stepwise as progressing toward the discharge end 31b, the speed of the flow of the mixed pulp slurry MS decreases stepwise. As a result, an eddy is generated within the pipe 31, whereby a relatively large shearing force is applied to the mixed pulp slurry MS. By the effect of the shearing force, the pulp fibers contained in the mixed pulp slurry MS are dispersed effectively. The viscous agent solution M is dispersed and mixed into the material pulp slurry S without being considerably deteriorated by the eddy generated in the pipe 31.
  • the mixed pulp slurry MS in which the pulp fibers are properly dispersed by passing through the manifold 30 (pipes 31), undergoes a proper decrease of viscosity due to the shearing and is ejected from the discharge ends 31b onto the running wire element 4 through the discharge opening 3a.
  • the pulp fibers contained in the mixed pulp slurry MS are dispersed uniformly. Thereafter, the mixed pulp slurry MS is dewatered, and the process steps such as pressing and drying are performed to provide paper as a finished product.
  • the use of a polyethylene oxide-based viscous agent has good effect even when a high-speed paper machine incorporating a manifold having a cell-structure is used.
  • a polyethylene oxide-based viscous agent has been conventionally used for papermaking by a cylinder machine
  • the use of a polyethylene oxide-based viscous agent for papermaking by a high-speed paper machine has been avoided because the reduction of viscosity is considerable and the pulp dispersion effect cannot be obtained.
  • the inventors of the present invention sought the way to effectively use polyethylene oxide, which is stably produced industrially and has been used as an effective viscous agent for a cylinder machine, for a high-speed paper machine.
  • the inventors have found that, when a polyethylene oxide-based viscous agent solution has a concentration (0.03 to 0.4 wt %) which is considerably higher than that (not higher than about 0.01 wt %) of a solution used for a cylinder machine, proper pulp dispersion effect is exhibited, and paper having excellent formation is obtained.
  • the concentration of the viscous agent solution M to be added to the material pulp slurry S is 0.03 to 0.4 wt %, and more preferably, 0.03 to 0.2 wt %.
  • the concentration of the viscous agent solution M to be added is not more than 0.03 wt %, the pulp dispersion effect of the viscous agent solution is deteriorated due to the reduction of viscosity by the shearing in the head box 3, and hence, the formation of paper is hardly improved.
  • the concentration of the viscous agent solution M to be added exceeds 0.4 wt %, the viscous agent solution M is not sufficiently mixed with the material pulp slurry S in the head box because of the high viscosity of the viscous agent solution M.
  • the viscous agent solution partially agglomerates into a strip or a block, whereby the dispersion of the pulp fibers is hindered. In this case, failures such as paper breakage may occur, and stable papermaking may not be performed.
  • the produced paper may include defects such as specks and/or holes, whereby the quality of paper deteriorates.
  • the concentration of the viscous agent solution M to be added is 0.03 to 0.4 wt %, the pulp dispersion effect is properly exhibited, and the defects such as specks and/or holes are prevented.
  • the papermaking method according to the present invention paper having excellent formation is obtained, and thus, the improvement of the quality is achieved.
  • the use of a proper viscous agent reduces the failures such as paper breakage due to insufficient dispersion of pulp fibers, and hence, stable papermaking is possible.
  • the yield of papermaking is enhanced, and the production efficiency is improved.
  • the viscous agent (polyethylene oxide) used in the papermaking method according to the present invention has a viscosity average molecular weight of 3million to 11 million, and preferably, 4 million to 9million.
  • the amount of the viscous agent to be used depends on the kind of paper and is not limited to a particular value, the amount of 0.001 to 1.0 %, and preferably 0.01 to 0.5 % relative to the dry weight of the paper to be produced is considered effective.
  • the viscous agent solution M does not necessarily need to be added through the pipe 22 connected to the pipe 21 which connects the screen 2 and the head box 3 to each other.
  • the viscous agent be added at a position between the screen 2 and the head box 3, i.e., at a position downstream from the screen 2 and upstream from the head box 3. This is because, when the viscous agent solution M is added at a position upstream from the screen 2, the viscosity decreases by the shearing in the screen 2, so that the pulp dispersion effect by the viscous agent may not be exhibited.
  • the papermaking method according to the present invention is preferably applicable to the making of thin paper such as tissue paper or toilet paper having a basis weight of not more than 60g/m 2 , but is not limited thereto.
  • Paper was made from a material pulp slurry S using the papermaking system X1 according to the above-described embodiment.
  • a crescent former was operated to run at a speed of 800m/min to form tissue paper having a basis weight of 13 g/m 2 .
  • As the material pulp slurry S a slurry of 0.15 wt % was prepared from NBKP (conifer pulp) and LBKP (broadleaf pulp) of 640 mlcsf beating degree (Canadian Standard Freeness) mixed at the ratio of 40 to 60 (weight ratio).
  • the viscous agent solution M use was made of an aqueous solution of polyethylene oxide having a concentration of 0.07 wt %, which was prepared by dissolving polyethylene oxide (Tradename:PEO-27,Viscosity average molecular weight:7500000, available from Sumitomo Seika Chemicals Co., Ltd.) in water while stirring.
  • polyethylene oxide Tradename:PEO-27,Viscosity average molecular weight:7500000, available from Sumitomo Seika Chemicals Co., Ltd.
  • the amount of the viscous agent used was 0.1 % relative to the dry weight of the paper produced.
  • the paper made as above was examined for the improvement of formation.
  • the formation was checked by visual inspection, and the result is given in Table 1.
  • Table 1 the mark ⁇ indicates that the formation is considerably improved, i.e., the pulp fibers are uniformly dispersed and holes and/or agglomeration of pulp fibers are hardly found, the mark ⁇ indicates that the improvement of formation is hardly found, and the mark ⁇ indicates that the formation is poor, i.e. , holes and/or agglomeration of pulp fibers are found or a papermaking failure such as breakage of paper is caused.
  • Example 2 paper was made under the same conditions as those of Example 1 except that the aqueous solution of polyethylene oxide used as the viscous agent solution M had the concentration of 0.03 wt %.
  • the examination result of the formation of the paper obtained by this example is also given in Table 1.
  • a Fourdrinier machine was used as the paper machine. Specifically, the Fourdrinier machine was operated to run at a speed of 1100m/min to form tissue paper having a basis weight of 17 g/m 2 .
  • a slurry of 0.12 wt % was prepared from NBKP and LBKP of 660 mlcsf beating degree (Canadian Standard Freeness) mixed at the ratio of 60 to 40 (weight ratio).
  • the viscous agent solution use was made of an aqueous solution of polyethylene oxide having a concentration of 0.06 wt %, which was prepared by dissolving polyethylene oxide (PEO-27) in water while stirring.
  • the polyethylene oxide solution was supplied into the pipe 21 between the screen 2 and the head box 3.
  • the amount of the viscous agent used was 0.15 % relative to the dry weight of the paper produced.
  • the examination result of the formation of the paper obtained by this example is also given in Table 1.
  • Example 3 The same paper machine as that of Example 3 was operated to run at a speed of 1000m/min to form tissue paper having a basis weight of 15 g/m 2 .
  • material pulp slurry S a slurry of 0.12 wt % was prepared from NBKP and LBKP of 660 mlcsf beating degree (Canadian Standard Freeness) mixed at the ratio of 60 to 40 (weight ratio).
  • the viscous agent solution use was made of an aqueous solution of polyethylene oxide having a concentration of 0.15 wt %, which was prepared by dissolving polyethylene oxide (PEO-27) in water while stirring. In the papermaking process, the polyethylene oxide solution was supplied into the pipe 21 between the screen 2 and the head box 3. The amount of the viscous agent used was 0.15 % relative to the dry weight of the paper produced.
  • the examination result of the formation of the paper obtained by this example is also given in Table 1.
  • the viscous agent solution M used in Examples 1-4 had a high concentration within a predetermined range, the formation of the paper was better than that of the paper formed using a viscous agent solution M of a lower concentration like Comparative Example 1.
  • the concentration (0.01 wt %) of the viscous agent solution M used in the Comparative Example 1 is close to the upper limit of the concentration range (not more than about 0.01 wt %) of polyethylene oxide solution conventionally known as appropriate for use for papermaking (using a cylinder machine).
  • the viscous agent solution M used in Comparative Example 2 had a concentration higher than the predetermined range, the viscous agent solution M agglomerated in the papermaking process due to the high viscosity to cause failures such as the breakage of the paper.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Claims (2)

  1. Verfahren zur Herstellung von Papier unter Anwendung einer Papiermaschine, die mit einem Stoffauflauf ausgestattet ist, der einen Verteiler mit einer Zellstruktur umfasst, wobei das Verfahren die Schritte umfasst:
    Hinzugeben einer wässrigen Lösung eines viskosen Agens zu einem Faserstoffbrei; und
    Einführen eines gemischten Faserstoffbreis, der den Faserstoffbrei und die wässrige Lösung des viskosen Agens enthält, in den Verteiler;
    dadurch gekennzeichnet, dass die wässrige Lösung des viskosen Agens Polyethylenoxid in einer Konzentration von 0,03 bis 0,4 Gew.-% enthält;
    die Zugabe der wässrigen Lösung des viskosen Agens zwischen dem Stoffauflauf und einem Sieb durchgeführt wird, das sich stromaufwärts von dem Stoffauflauf befindet; und
    die Menge an Polyethylenoxid, die dem Faserstoffbrei hinzugegeben wird, 0,001 bis 1,0 % mit Bezug auf das Trockengewicht des herzustellenden Papiers beträgt.
  2. Papierherstellungssystem umfassend:
    ein Sieb zum Entfernen von Verunreinigungen aus einem Faserstoffbrei;
    eine Papiermaschine, die mit einem Stoffauflauf ausgestattet ist, der einen Verteiler mit einer Zellstruktur umfasst, und stromabwärts von dem Sieb angeordnet ist; und
    einen Zugeber für ein viskoses Agens zum Zuführen einer wässrigen Lösung eines viskosen Agens zu dem Faserstoffbrei;
    dadurch gekennzeichnet, dass der Zugeber für ein viskoses Agens die wässrige Lösung, die Polyethylenoxid in einer Konzentration von 0,03 bis 0,4 Gew.-% enthält, in ein Rohr, das das Sieb und den Stoffauflauf miteinander verbindet, zuführt;
    die Menge an dem Faserstoffbrei zugegebenem Polyethylen 0,001 bis 1,0% mit Bezug auf das Trockengewicht des herzustellenden Papiers beträgt.
EP06822028.4A 2005-10-25 2006-10-23 Papierherstellungsverfahren und papierherstellungssystem Expired - Fee Related EP1950345B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005309721 2005-10-25
PCT/JP2006/321007 WO2007049528A1 (ja) 2005-10-25 2006-10-23 抄紙方法および抄紙システム

Publications (3)

Publication Number Publication Date
EP1950345A1 EP1950345A1 (de) 2008-07-30
EP1950345A4 EP1950345A4 (de) 2012-03-07
EP1950345B1 true EP1950345B1 (de) 2013-09-11

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Application Number Title Priority Date Filing Date
EP06822028.4A Expired - Fee Related EP1950345B1 (de) 2005-10-25 2006-10-23 Papierherstellungsverfahren und papierherstellungssystem

Country Status (11)

Country Link
US (1) US20090250182A1 (de)
EP (1) EP1950345B1 (de)
JP (1) JP4839320B2 (de)
KR (1) KR101321465B1 (de)
CN (1) CN101297080B (de)
AU (1) AU2006307310B2 (de)
BR (1) BRPI0617919B1 (de)
CA (1) CA2627471C (de)
RU (1) RU2413810C2 (de)
TW (1) TW200730697A (de)
WO (1) WO2007049528A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4977127B2 (ja) * 2006-03-16 2012-07-18 住友精化株式会社 抄紙方法及び抄紙機

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CA2118771A1 (en) * 1993-04-30 1994-10-31 Charles L. Burdick Aqueous suspensions of poly(ethylene oxide) useful as retention aid in paper manufacture
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JP3530499B2 (ja) * 2001-03-19 2004-05-24 三菱重工業株式会社 チューブバンク構造及びフローチューブの製造方法
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JP4522692B2 (ja) * 2003-11-28 2010-08-11 ダイヤニトリックス株式会社 抄紙用粘剤

Also Published As

Publication number Publication date
BRPI0617919A2 (pt) 2011-08-09
JPWO2007049528A1 (ja) 2009-04-30
RU2008120194A (ru) 2009-12-10
RU2413810C2 (ru) 2011-03-10
CN101297080A (zh) 2008-10-29
TWI379931B (de) 2012-12-21
AU2006307310B2 (en) 2010-09-23
AU2006307310A1 (en) 2007-05-03
TW200730697A (en) 2007-08-16
CA2627471C (en) 2013-12-10
EP1950345A1 (de) 2008-07-30
US20090250182A1 (en) 2009-10-08
WO2007049528A1 (ja) 2007-05-03
BRPI0617919B1 (pt) 2018-02-06
CN101297080B (zh) 2011-04-06
JP4839320B2 (ja) 2011-12-21
EP1950345A4 (de) 2012-03-07
KR101321465B1 (ko) 2013-10-25
CA2627471A1 (en) 2007-05-03
KR20080068093A (ko) 2008-07-22

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