EP0964099B1 - Method in a reel-up in a grade change situation - Google Patents

Method in a reel-up in a grade change situation Download PDF

Info

Publication number
EP0964099B1
EP0964099B1 EP99660097A EP99660097A EP0964099B1 EP 0964099 B1 EP0964099 B1 EP 0964099B1 EP 99660097 A EP99660097 A EP 99660097A EP 99660097 A EP99660097 A EP 99660097A EP 0964099 B1 EP0964099 B1 EP 0964099B1
Authority
EP
European Patent Office
Prior art keywords
reel
web
grade
pulper
paper
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
EP99660097A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0964099A2 (en
EP0964099A3 (en
Inventor
Esa Aalto
Timo Rautakorpi
Jari Tiitta
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.)
Metso Paper 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
Publication of EP0964099A2 publication Critical patent/EP0964099A2/en
Publication of EP0964099A3 publication Critical patent/EP0964099A3/en
Application granted granted Critical
Publication of EP0964099B1 publication Critical patent/EP0964099B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the invention relates to a method in a reel-up when changing paper grade, i.e. in a grade change situation.
  • the composition of the stock to be supplied from the headbox can be changed and/or the paper manufacturing process can be changed in other respects to correspond to the new grade.
  • the change there is a break in the production of completed paper suitable for sale or further processing, and the paper web accumulated during this time is passed to broke.
  • the grade change is conducted in the following way:
  • the reel is changed in the normal manner and the production process is changed in a way that one or some of the characteristics of the paper to be produced are changed.
  • Paper which is produced during the grade change and which does not yet fulfil the requirements of the new grade is reeled on the bottom of the new reel.
  • this point is marked in some way at the end face of the roll.
  • it is known in further processing which part of the reel consists of broke, and this bottom part of the reel can be discharged into a pulper.
  • This method requires extra labour both in reeling and in unwinding during further processing of the reel.
  • the part of the reel that does not meet the requirements of the new grade must be removed by cutting it off the reel in a separate operation known as "slabbing".
  • the purpose of the invention is to present a novel grade change sequence whereby the grade change can be performed in a controlled manner without wasting employee resources to extraneous reel handling.
  • the invention is primarily characterized in what will be presented in the appended claims.
  • the length of such grade change web where the properties are gradually changing to comply with the new grade can be several kilometres, depending on the running speed and the duration of the grade change.
  • Figure 1 shows a known reel-up in a paper machine, reeling a continuous web W passed from preceding stages of the paper manufacturing process or paper aftertreatment process into a machine reel R.
  • the web W is passed via a reeling cylinder 1, and it is wound via a peripheral moving surface of a web guiding means to the reel R, such as via a rotatable reeling nip between the reeling cylinder and the reel onto the reel.
  • the core of the reel is constituted by a reel spool 2, which is rotated with a centre drive and is loaded at its ends towards the reeling cylinder 1 by loading devices known as such.
  • Below the reeling cylinder 1 there is a pulper P, a so-called dry-end broke pulper, which in this example is shared by a machine calender K preceding the reel-up.
  • An initial reeling device which is arranged pivotable around an axis parallel to the rotation axis of the reeling cylinder 1 and which brings an empty reel spool 2 in connection with the reeling cylinder 1, is indicated with the reference numeral 3.
  • the ends of the reel spool 2 rest on reeling rails 4 and are coupled with a reeling carriage 5 movable in the direction of the reeling rails by the loading devices.
  • the loading can be transmitted to the reel spool 2 also via another mechanism.
  • the reel-up operates continuously in a manner that paper web emerging from the process runs at the production speed during the reel change as well, that is, the reel is changed by breaking the web going to the full reel and guiding the leading end of the web around a new empty reel spool at the full production speed of the paper web.
  • the measuring devices M Before the reeling cylinder, there is one or several measuring devices M for measuring one or several properties of the web to be manufactured and thereby also properties indicating a grade change.
  • the measuring devices can be sensing heads traversing in a known way across the moving web and fixed to a measuring frame extending across the web.
  • the paper machine Before running a grade change sequence, the paper machine produces a paper grade A which is reeled up into a machine reel R.
  • the grade change sequence is started at the reel-up when the last required reel of grade A is almost complete.
  • the reel is separated from the reeling cylinder 1 and after this it is slowed down, wherein the slackening web travels towards the pulper and breaks.
  • an empty reel spool 2 At the latest at the stage of slowing down the reel, an empty reel spool 2 is in a nip contact with the reeling cylinder 1.
  • the nip contact which must exist at the time of the web break, is used to secure a sufficient web tension and draw before the reel-up and a reliable course of the process during the grade change.
  • Changes in the paper web can be started immediately after the web has broken or possibly already slightly before it, taking into account the delay due to the point of change in the process and the running speed, after which the change will appear in the web coming to the reel-up.
  • the paper machine produces grade change broke which is run as a full-width web from the reel-up directly to the pulper P as well as from there, immediately or with a delay, e.g. to a couch pit and further to broke processing.
  • the web W that is run from the reeling cylinder 1 to the pulper P is shown with a broken line.
  • the web when it fulfils the quality requirements for the grade, the web is changed to a new empty reel spool and the reeling of the first machine reel containing the grade B is started.
  • the paper machine After the grade change sequence, the paper machine produces paper grade B, which is reeled into subsequent machine reels by changing the web from reels being completed to new reel spools.
  • the grade change sequence of the reel-up makes it possible to adjust automatically or manually the manipulated variables of the paper machine required by the grade change, as well as to utilize the measuring signals given by the measuring device on an on-line measuring beam extending transversely to the travel direction of the web, whereby production time of the machine is saved in the grade change situation.
  • the grade change sequence of the reel-up is integrated as part of the operation of the paper machine, it is possible to control the production more accurately and efficiently than at present.
  • the grade change sequence can be performed as a manual run from the local control panel of the reel-up. It can also be implemented as a fully automatic function in the machine.
  • Figure 2 shows the grade change sequence in a flow chart.
  • Fig. 1 shows also some elements of the pulper P, such as slope water showers 6, follower water showers 7, and possible other water showers 8.
  • a control device photosensitive cell
  • a second control device which is located before the reeling cylinder 1 and which can also be accomplished in form of a photosensitive cell, is indicated with the numeral 10.
  • the numeral 11 refers to air vents located in the upper part of the pulper and connected with a fan to secure that no moist air gets from the pulper to the machine hall
  • the numeral 12 refers to a discharge pump arranged to pump broke pulp from the pulper e.g . to a stock handling system.
  • the paper machine In the starting situation, the paper machine is in a normal running state, and the old grade is being run into a machine reel R for the last time before changing the paper grade to one that deviates from the preceding one with respect to one or several properties which can be grammage, colour, stock composition, or another property that can be used to define a grade.
  • Production that does not comply with the new quality requirements during the grade change is passed to broke immediately on the reel-up in a way that labour as well as broke handling capacity are saved for more important purposes on the production line.
  • the operator Before the change situation of the reel-up, the operator starts the grade change sequence at the display terminal of the control room, which results in starting e.g. the following sequence of operations before the moment of change:
  • This grade change sequence can be started also automatically, if it has been automatized in the production control system.
  • the steps B and C take place in succession, the step C being an immediate outcome of the step B.
  • the other steps are performed preferably in the above-mentioned order. If the functions of the pulper required during the grade change are started in time, the pulper is at once ready to receive the web passed into the pulper at the running speed. Without deviating from the basic idea of the invention, it is also possible to perform the step A simultaneously with or slightly after the step B. Similarly, the step D could, in principle, be performed simultaneously with the step B, if the changes in the parameters do not have time to affect the web still running into the reel for a short time after the releasing.
  • the invention can be applied particularly in connection with a paper machine but also in a machine for after-treatment of paper when changing the way of treatment and thereby the grade, if a broke handling system of a suitable capacity is available, it being understood that paper manufacture in this context also encompasses manufacturing finished paper in an aftertreatment process.
  • the term paper web is used here to refer to all continuous webs made of a fibre material, irrespective of their grammage.

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Paper (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Coating With Molten Metal (AREA)
  • Pens And Brushes (AREA)
  • Braking Systems And Boosters (AREA)
  • Laser Beam Printer (AREA)
EP99660097A 1998-06-09 1999-06-02 Method in a reel-up in a grade change situation Expired - Lifetime EP0964099B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981310 1998-06-09
FI981310A FI104162B (sv) 1998-06-09 1998-06-09 Förfarande vid en rullstol vid slagbyte

Publications (3)

Publication Number Publication Date
EP0964099A2 EP0964099A2 (en) 1999-12-15
EP0964099A3 EP0964099A3 (en) 2000-07-26
EP0964099B1 true EP0964099B1 (en) 2003-08-20

Family

ID=8551938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99660097A Expired - Lifetime EP0964099B1 (en) 1998-06-09 1999-06-02 Method in a reel-up in a grade change situation

Country Status (5)

Country Link
EP (1) EP0964099B1 (sv)
AT (1) ATE247744T1 (sv)
CA (1) CA2274194C (sv)
DE (1) DE69910495T2 (sv)
FI (1) FI104162B (sv)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI123500B (sv) 2009-09-25 2013-06-14 Metso Paper Inc Arrangemang i samband med en anordning för upprullning av en fiberbana
EP2474666A1 (en) 2011-06-21 2012-07-11 Metso Paper Inc. Arrangement for a fiber web production line

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI91383C (sv) * 1990-10-26 1997-01-22 Valmet Paper Machinery Inc Förfarande vid pårullning
DE4401959C2 (de) * 1994-01-24 1996-07-25 Voith Gmbh J M Tragtrommelroller für eine Papiermaschine

Also Published As

Publication number Publication date
EP0964099A2 (en) 1999-12-15
CA2274194C (en) 2007-08-28
EP0964099A3 (en) 2000-07-26
FI981310A0 (sv) 1998-06-09
CA2274194A1 (en) 1999-12-09
FI104162B1 (sv) 1999-11-30
DE69910495T2 (de) 2004-02-26
ATE247744T1 (de) 2003-09-15
FI104162B (sv) 1999-11-30
DE69910495D1 (de) 2003-09-25

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