EP1012383B1 - Method for control of the curl of paper in the dryer section of a paper machine and paper or board machine - Google Patents

Method for control of the curl of paper in the dryer section of a paper machine and paper or board machine Download PDF

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Publication number
EP1012383B1
EP1012383B1 EP98910766A EP98910766A EP1012383B1 EP 1012383 B1 EP1012383 B1 EP 1012383B1 EP 98910766 A EP98910766 A EP 98910766A EP 98910766 A EP98910766 A EP 98910766A EP 1012383 B1 EP1012383 B1 EP 1012383B1
Authority
EP
European Patent Office
Prior art keywords
web
dryer
paper
cylinders
curl
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 - Lifetime
Application number
EP98910766A
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German (de)
English (en)
French (fr)
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EP1012383A1 (en
Inventor
Vesa Ijäs
Kari Juppi
Pasi Ahonen
Jaakko Kallioniemi
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
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Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1012383A1 publication Critical patent/EP1012383A1/en
Application granted granted Critical
Publication of EP1012383B1 publication Critical patent/EP1012383B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/08—Arrangement of steam points in the cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders

Definitions

  • the invention concerns a method in the dryer section of a paper or board machine for control of the curl of surface - sized fine paper, in which method steam treatment and/or moistening of the paper web is/are employed, for control of the curl of the paper web.
  • the invention also concerns a paper machine, which comprises at least a headbox, a former, a press, and a dryer section, in which steam boxes or moistening devices are employed for control of the curl of surface-sized fine paper.
  • twin-wire draw and/or single-wire draw is/are employed.
  • twin-wire draw the groups of drying cylinders comprise two wires, which press the web one from above and the other one from below against heated cylinder faces. Between the rows of drying cylinders, which are usually horizontal rows, the web has free and unsupported draws, which are susceptible of fluttering, which may cause web breaks, in particular so when the web is still relatively moist and, therefore, of low strength.
  • each group of drying cylinders includes just one drying wire, on whose support the web runs through the whole group so that the drying wire presses the web on the drying cylinders against the heated cylinder faces, whereas on the reversing cylinders or rolls between the drying cylinders the web remains at the side of the outside curve.
  • the drying cylinders are placed outside the wire loop, and the reversing cylinders or rolls inside said loop.
  • the tendency of curling of paper is already affected in connection with the web formation, in particular at the sheet formation stage (for example, the applicant's Sym-FormerTM ) by means of selection of the difference in speed between the slice jet and the wire, by means of the choice of the former and its mode of running, and by means of other running parameters.
  • the sheet formation stage for example, the applicant's Sym-FormerTM
  • a suitable initial curl form is regulated for the sheet in order that the curling of the paper after one-sided or double-sided copying could be optimized.
  • the reactivity of curling i.e. the extent to which curling occurs per unit of change in moisture content, is affected to a greater extent by means of a multi-layer structure of the paper, which is produced in connection with the web formation in the wet end.
  • the object of the present invention is to provide a dry end of a paper machine in which no inverted groups are needed at all, but which, however, meets all other requirements that are imposed.
  • the object of the present invention is to approach these problems from a new point of view and to suggest novel solutions for said problems, which solutions are contrary to conventional modes of thinking.
  • FI Patent No. 91, 900 (equivalent to US Pat. No. 5, 416, 980), in which a method is described in the dryer section of a paper machine in particular for reducing the tendency of curling of paper, in which method the paper web is dried by means of drying cylinders, against whose heated faces the paper web is pressed by means of a drying wire, and in which dryer section groups of drying cylinders are used in which twin-wire draw and/or single-wire draw is/are applied.
  • the paper broke is removed downwards from the dryer groups open towards the bottom substantially by the force of gravity onto the broke conveyor placed underneath.
  • the paper web with a tendency of curling is passed into a finishing section, in which it is after-treated while it is, at the same time, moistened or worked plastically so that the tendency of curling that arose in it in the forward drying stage is eliminated.
  • the after-dryer section groups with twin-wire draw and regulation of steam as well as the steam boxes fitted to control the curl as well as the infra and airborne web drying.
  • a method for drying of paper comprises the following steps: the paper web to be dried is passed from the press section into a forward dryer section, in which the paper web is dried from the side of its bottom face in dryer groups that apply a normal single-wire draw, said forward dryer section comprising exclusively single-wire groups with normal single-wire draw, and from the forward dryer section the paper web is passed into a finishing section, in which the paper web is coated/surface-sized by means of a coating/surface-sizing equipment, dried in an after-dryer section, in which the paper web is dried in at least one dryer group that applies a normal single-wire draw, after which the paper web is calendered in a calender and passed to a reeling station, in which the paper web is reeled into a machine reel, and in the method the curling of the paper
  • the dry end of the paper machine comprises a forward dryer section and a finishing section, which finishing section comprises a coating/surface-sizing equipment, an after-dryer, a calender, and a reeling station.
  • the dry end of the paper machine comprises elements and/or assemblies and combinations formed out of said elements in view of controlling the curling of the paper web in the area of the forward dryer section and/or of the finishing section.
  • the elements for the control of the curl include, among other things, blowing of hot moist air through the wire in the forward dryer section, steam boxes employed in the after-dryer, a combination in which steam treatment by means of a steam box is combined with a cooling cylinder, a lower support belt or support wire in the after-dryer, twin-wire groups employed in the after-dryer, blowing through the wire in connection with at least one cylinder in the after-dryer, the use of a suitable cylinder-diameter ratio, atomizing of water against the web in the after-dryer, infrared boxes for treatment of the web before the calender, transfer of moist air from the forward dryer to the after-dryer to be blown against the web, and mechanical working of the web by means of a spreader bar.
  • EP 726 353 proposes disposing a steam box against the last cylinder but one in a dryer section and a second steam box just before the first soft calender, and two-stage moistening before working the web mechanically.
  • the object of the present invention is further development of the prior-art solutions described above in order that it should be possible to control the curl of the paper web in the dry end of the paper machine more efficiently.
  • the method in accordance with the invention is mainly characterized in that, in the method, the steam treatment and/or moistening of the paper web carried out in view of controlling the curl of the paper web are carried out in a number of stages before the finishing device that works the web mechanically in a dry solids content range of 88 to 98% and that the web is cooled, during at least one stage, to a temperature lower than 75 °C.
  • the paper or board machine in accordance with the invention is characterized in that there are at least two of said curl regulation devices for regulation of the curl in a number of stages before the finishing device that works the web mechanically in a dry solids content range of 88 to 98% and that there are means for cooling the web, during at least one stage, to a temperature lower than 75 °C.
  • the curl is regulated when the web temperature is lower than 85 °C, preferably lower than 75 °C. Steam condenses into the web more efficiently when the web temperature has been lowered to a level below 85 °C, preferably below 75 °C.
  • the applicant of the patent has carried out experiments with a production machine. When the last upper cylinder in the dryer section was hot, a steam box placed directly after said cylinder had no major effect on the curl; when the supply of steam into said cylinder was closed, the temperature of the web became lower, and a significant effect was produced by the steam box.
  • the curl of the paper web is regulated in the final end of the drying process.
  • an excessive drying promotes the control of the curl when moistening/steam treatment is employed.
  • optimal controllability is obtained in a range of dry solids content that extends from about 7 % lower than the desired ultimate dry solids content to about 3 % above said content. In the case of surface-sized fine paper, said range is typically 88 % to 98 %.
  • the curl regulation operations such as steam treatment/moistening and cooling of the web
  • the curl regulation operations are carried out in a number of stages, in which case a highly efficient curl regulation effect is obtained.
  • a mere steam treatment in one stage reduces the curl substantially, but the web is still curled in the original direction by about 5 units.
  • the web curl direction can be even reversed.
  • a moistening device is highly efficient in lowering the web temperature.
  • a cooling cylinder can be substituted for by a moistening device.
  • the dry end of the paper machine is preferably exclusively based on dryer groups with single-wire draw, in which case the removal of broke takes place constantly by the force of gravity and does, thus, not cause problems.
  • the paper web is constantly supported by a wire, in which case the runnability is improved and it is possible to increase the speed.
  • the after-dryer in the dry end of the paper machine elements have been provided for the control of the tendency of curling in accordance with the principles described above so that the desired curl is obtained for the paper.
  • cylinders which can be cooled and/or whose temperature can be regulated as well as moistening or steam boxes are used, which have been placed alternatingly so as to provide a multi-stage cooling/moistening-curl cycle, together with an optimal roll/cylinder diameter as a combination formed in a favourable way.
  • it is affected by means of optimization of the cylinder-roll diameter ratio that when the diameter of a suction roll is made larger, the evaporation taking place through the lower face is increased, and the other way round.
  • a favourable feature of the invention is the choice of a suitable cylinder-roll diameter ratio so that, when the web runs around a suction roll or equivalent of larger diameter, the web temperature is lowered.
  • a steam box is fitted so as to provide moistening in view of regulation of the curl.
  • the paper web is preferably also cooled primarily from the bottom side when the forward dryer and the after-dryer in the dryer section are, as a rule, provided with a normal single-wire draw, i.e., in principle, attempts are made to produce a temperature gradient in the paper web so that the side that is moistened for control of the curl is colder than the opposite side of the web.
  • Figure 1 is a schematic illustration of an exemplifying embodiment of the present invention in respect of the dry end of a paper machine, the dry end of the paper machine being illustrated from the forward dryer section up to the machine reel.
  • Figure 2 is a schematic illustration in part of Fig. 1, mainly in respect of the last dryer group in the after-dryer of the finishing section in the dry end of the paper machine.
  • Figure 3 is a schematic illustration of test results in relation to regulation of the curl in paper by means of water moistening and steam treatment.
  • the paper web W is brought to the forward dryer section D1 from the press section onto the drying wire 15 of the first group R 0 with single-wire draw, to which wire the web is made to adhere by the effect of the vacuum in the suction boxes 13.
  • the forward dryer section includes 7 groups R 0 ...R 6 with single-wire draw, over whose group gaps the web W has a closed draw.
  • the machine direction i.e. the running direction of the web W, is denoted with the arrow S.
  • all the single-wire groups R 0 ...R N are so-called normal groups, in which the, for example, steam-heated smooth-faced drying cylinders 10 are placed in the upper horizontal row and the reversing suction cylinders 11 are placed in the lower horizontal row.
  • Each normal group R 0 ...R N has a drying wire 15 of its own, which is guided by guide rolls 18.
  • the drying wires 15 press the web W to be dried on the drying cylinders 10 against the smooth heated faces of the cylinders, and on the reversing cylinders 11 the web W remains at the side of the outside curve on the outer face of the wire 15.
  • the web W is kept reliably on the support of the wire 15 against the effects of centrifugal forces by the effect of the vacuum present in the grooved faces of the reversing cylinders 11 or in the perforated mantles of equivalent suction rolls, by which means cross-direction shrinkage of the web W is also counteracted.
  • the suction cylinders 11 particularly advantageously the suction cylinders marketed by the applicant with the trade mark VacRollTM are used, which cylinders have no inside suction boxes and in respect of the details of whose constructions reference is made to the applicant's FI Patent No. 83,680 (equivalent to US Patents Nos. 5,022,163 and 5,172,491) .
  • the support contact between the web W and the drying wire 15 is kept adequate also on the straight draws between the drying cylinders 10 and the reversing cylinders 11 by, at least on the runs from the drying cylinders 10 to the reversing cylinders 11, making use of blow-suction boxes 17, by means of which boxes formation of pressures induced by the wire 15 is also prevented in the closing wedge-shaped nip spaces between the wire 15 and the cylinder 11 mantles.
  • Blow-suction boxes 17 are understood as blow boxes whose air blowing produces a vacuum, and said boxes 17 do not communicate with sources of vacuum.
  • blow boxes 16 are also employed in the gaps between the reversing cylinders 11, by means of which boxes 16 said gap spaces are air-conditioned and evaporation from the web W is promoted.
  • the faces of the drying cylinders 10 are kept clean by doctors 14.
  • the reversing cylinders 11 in the forward dryer D1 favourably the applicant's VacTM rolls are used.
  • This vacuum effect is spread through the perforations on the reversing cylinders 11 onto the grooved mantle 12 so that the wedge-shaped nip spaces between the reversing cylinders 11 and the drying wire can also be evacuated efficiently, so that pressures cannot be induced into these wedge spaces, which pressures would attempt to separate the web W from the drying wire when the web W is placed outside.
  • suction zone should preferably be extended over an area wider than the turning sector of the drying wire 15 and the web, so that the suction effect and the free flow of air can be extended into said wedge spaces, for the purposes mentioned above.
  • the dry end of a paper machine in accordance with the invention includes a finishing unit D2 placed after the forward dryer D1, which finishing unit includes a machine reel-up 50, for example a Pope-type reel-up.
  • a machine reel that is being produced on-line by means of the reel-up 50 is denoted with the reference MR 0
  • one complete machine reel is denoted with the reference MR.
  • the web W is brought to the machine reel-up 50 through the calender 40 from an after-dryer 30, which is placed after the coating device 20 in the finishing section D 2 .
  • the paper web W which has been dried to a dry solids content of k 2 ⁇ 96...99 %, is passed over paper guide rolls 25 and over a measurement beam 26, which is placed between said guide rolls 25 and which measures the property profiles of the paper, into a coating device 20, which is, for example, a coating device marketed by the applicant with the name SymSizer TM.
  • the coating device 20 includes two coating rolls 21 and 22 placed one opposite to the other, and size feed devices 23 and 24 are placed in connection with both of said rolls so that the paper web W is coated from both sides in the coating nip NS between the rolls 21 and 22.
  • the web W is partly moistened in the coating nip NS from both sides. Then, the web W, which was dried in the forward dryer D1 asymmetrically from the side of its bottom face W and which has a tendency of curling, is treated into such a state that its internal strains are partly relaxed or at least substantially reduced.
  • the after-dryer 30 in the finishing section D 2 is also exclusively composed of dryer groups R 21 ,R 22 ,R 23 with single-wire draw.
  • the last dryer group R 23 in the after-dryer 30, in which group the curl control arrangements are fitted, will be described in more detail in relation to Fig. 2.
  • the first two groups R 21 ,R 22 which are provided with a possibility of impingement blowing 19, are basically similar to the dryer groups R 0 ...R 6 in the forward dryer D 1 , and the same reference numerals are used for corresponding parts.
  • the last dryer group R 23 in the after-dryer first includes a drying cylinder 10 in the group gap and a following reversing roll or cylinder 11 and further a second drying cylinder 10 and a following reversing cylinder 11.
  • a cylinder 61 of adjustable temperature preferably a cylinder that can be cooled.
  • the web W is passed onto the reversing roll or cylinder 11 in the lower row and onto a second cylinder 63 of adjustable temperature, preferably a cooling cylinder.
  • the drying wire is denoted with the reference numeral 15, and its guide rolls are denoted with the reference numeral 18, the runnability components with the reference numeral 17, and the doctors with the reference numeral 14, as is the case in Fig. 1.
  • a moistening device 62 and preferably a steam box 64 are placed. Both devices can, of course, be both moistening or steam treatment devices.
  • the paper web W is moistened/steam-treated before the web W is passed onto the cylinders 61,63, which are, thus, preferably cooled cylinders. From the latter cooling cylinder 63 the web W is passed past the steam box 65 of the guide roll 71 to the calender 40 and further to the reel-up 50.
  • the diameter D 11 of the reversing rolls or cylinders 11 in the last dryer group R 23 is larger than the diameter D of the reversing rolls or cylinders 11 in the preceding groups.
  • the diameter ratio of the diameter D 11 of the reversing cylinder 11 to the diameter D 0 of the drying cylinders 10 / cooling cylinders 61,63 has been chosen so that the web W is also cooled in this way on the face of the reversing cylinder 11 of a diameter larger than usual so as to intensify the effect of regulation of the curl.
  • the diameter ratio D 0 /D 11 is 0.75...2.5, preferably 1...1.5.
  • the dryer section is placed inside a hood, in a conventional way, for recovery of the moist air, to improve the energy economy, and to intensify the air-conditioning of the dryer section.
  • a wire circulation of its own it is preferable to isolate said area from the rest of the hood by means of a partition wall.
  • Fig. 3 is a schematic illustration of test results related to regulation of the curl of paper by means of water moistening and steam treatment.
  • the Y axis represents the curl
  • the X axis represents the test points 1 to 3.
  • one-sided drying has been used, in the test point 2 one-sided drying and steam-treatment, and in the test point 3 one-sided drying, water moistening and steam-treatment.
  • the sign of the curl is positive, the curling takes place towards the top side, and when the sign of the curl is negative, the curling takes place towards the bottom side.
  • a one-sidedly dried web curls intensively (20 units). Steam treatment alone at one stage reduces the curl substantially, but the web still curls in the original direction by about five units. When the web has been moistened slightly before steam treatment, the web curl direction can be even reversed.
  • the invention is by no means supposed to be strictly confined to said solution, but the invention can also be utilized in connection with conventional cylinder dryer concepts or while using drying other than cylinder drying, such as, for example, impingement drying.

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  • Paper (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
EP98910766A 1997-03-27 1998-03-23 Method for control of the curl of paper in the dryer section of a paper machine and paper or board machine Expired - Lifetime EP1012383B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI971301 1997-03-27
FI971301A FI971301A (fi) 1997-03-27 1997-03-27 Menetelmä paperin käyristymän hallitsemiseksi paperikoneen kuivatusosalla ja paperi- tai kartonkikone
PCT/FI1998/000253 WO1998044191A1 (en) 1997-03-27 1998-03-23 Method for control of the curl of paper in the dryer section of a paper machine and paper or board machine

Publications (2)

Publication Number Publication Date
EP1012383A1 EP1012383A1 (en) 2000-06-28
EP1012383B1 true EP1012383B1 (en) 2006-06-07

Family

ID=8548489

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Application Number Title Priority Date Filing Date
EP98910766A Expired - Lifetime EP1012383B1 (en) 1997-03-27 1998-03-23 Method for control of the curl of paper in the dryer section of a paper machine and paper or board machine

Country Status (10)

Country Link
EP (1) EP1012383B1 (fi)
JP (1) JP3660360B2 (fi)
CN (1) CN1101499C (fi)
AT (1) ATE329082T1 (fi)
AU (1) AU6502198A (fi)
BR (1) BR9808431A (fi)
CA (1) CA2284053C (fi)
DE (1) DE69834820T2 (fi)
FI (1) FI971301A (fi)
WO (1) WO1998044191A1 (fi)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI112684B (fi) 1999-03-23 2003-12-31 Metso Paper Inc Menetelmä paperi- tai kartonkirainan käyristymän mittaamiseksi ja säätämiseksi sekä paperi- tai kartonkikonelinja
FI106269B (fi) 1999-05-10 2000-12-29 Valmet Corp Päällepuhallussovitelma ja -menetelmä käsiteltävän paperi- tai kartonkirainan käyristymistaipumuksen kompensoimiseksi sekä paperi- tai kartonkikone
JP4651314B2 (ja) * 2004-06-15 2011-03-16 レンゴー株式会社 紙・板紙の表面平滑処理装置
DE102005034065A1 (de) * 2005-07-21 2007-01-25 Voith Patent Gmbh Trockenpartie
US8277610B2 (en) 2007-04-10 2012-10-02 Xerox Corporation Mechanical fiber paper with controlled curl
DE102010039093A1 (de) * 2010-08-09 2012-02-09 Voith Patent Gmbh Verfahren und Vorrichtung zur Regelung der Feuchte einer Materialbahn
CN103669088A (zh) * 2012-09-10 2014-03-26 国能纸业有限公司 用于长网多缸造纸机上的前烘干系统
EP2765237B1 (en) 2013-02-06 2016-11-23 Valmet Technologies, Inc. Method for producing a fiber web and production line for producing a fiber web
CN104859291B (zh) 2015-04-13 2017-12-29 京东方科技集团股份有限公司 一种干燥装置及其干燥方法
CN110446811B (zh) * 2017-03-21 2021-06-04 福伊特专利有限公司 幅面处理
CN108166315A (zh) * 2017-12-08 2018-06-15 安徽金亿禾特种纸有限公司 一种复写纸幅的修饰方法
CN112748237B (zh) * 2020-12-29 2022-06-10 亚太森博(广东)纸业有限公司 一种复印纸原始翘曲检测方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI91900C (fi) * 1990-12-17 1994-08-25 Valmet Paper Machinery Inc Menetelmä paperikoneen kuivatusosalla paperin käyristymistaipumuksen vähentämiseksi ja menetelmän toteuttamiseen tarkoitettu kuivatusosa
DE9414963U1 (de) * 1994-09-16 1994-11-03 J.M. Voith Gmbh, 89522 Heidenheim Trockenpartie
FI98387C (fi) * 1995-02-01 1997-06-10 Valmet Corp Menetelmä pintakäsiteltävän paperin, etenkin hienopaperin, valmistamiseksi sekä paperikoneen kuivapää

Also Published As

Publication number Publication date
CA2284053A1 (en) 1998-10-08
JP2001503484A (ja) 2001-03-13
FI971301A0 (fi) 1997-03-27
EP1012383A1 (en) 2000-06-28
DE69834820T2 (de) 2006-11-09
JP3660360B2 (ja) 2005-06-15
CN1251629A (zh) 2000-04-26
ATE329082T1 (de) 2006-06-15
DE69834820D1 (de) 2006-07-20
AU6502198A (en) 1998-10-22
CA2284053C (en) 2005-11-22
FI971301A (fi) 1998-09-28
BR9808431A (pt) 2000-05-23
WO1998044191A1 (en) 1998-10-08
CN1101499C (zh) 2003-02-12

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