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EP2927369A1 - Doctor device for a fiber web machine and doctor arrangement in a fiber web machine - Google Patents

Doctor device for a fiber web machine and doctor arrangement in a fiber web machine Download PDF

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Publication number
EP2927369A1
EP2927369A1 EP15165020.7A EP15165020A EP2927369A1 EP 2927369 A1 EP2927369 A1 EP 2927369A1 EP 15165020 A EP15165020 A EP 15165020A EP 2927369 A1 EP2927369 A1 EP 2927369A1
Authority
EP
European Patent Office
Prior art keywords
doctor
blade
devices
holder
fiber web
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.)
Withdrawn
Application number
EP15165020.7A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hannu EERIKÄINEN
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
Valmet Technologies 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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP2927369A1 publication Critical patent/EP2927369A1/en
Withdrawn legal-status Critical Current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
    • D21G3/00—Doctors
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/04—Doctors for drying cylinders

Definitions

  • the invention relates to a doctor device for a fiber web machine, which doctor device includes blade devices and holder devices for arranging the blade devices in a fiber web machine to be placed in connection with an adapted doctor blade equipped with a blade holder to the edge areas of said doctor blade.
  • the invention also relates to a doctor arrangement in a fiber web machine.
  • Finnish patent number 110705 presents an arrangement in a fiber web machine.
  • the arrangement is intended for the so-called wet end of a fiber web machine, where material such as fibers and fillers adhere to the rolls from the moist web and especially from its edges. Accumulations of this kind result in, among other things, the web sticking to the roll surface, which increases web breaks and thus disturbs production.
  • the patent suggests that short blade devices be placed after the doctor blade that is supported to a blade holder, which blade devices enhance the doctoring efficiency of the arrangement at the edges of the doctor blade, i.e. at the edge areas.
  • the object of this invention is to accomplish a new type of a doctor device for a fiber web machine, which doctor device can be used for intensifying the efficiency of the doctor arrangement and at the same for reducing the uneven wear of the doctor blade.
  • Another object of the invention is to accomplish a new type of a doctor arrangement for a fiber web machine, where the doctoring efficiency of the doctor arrangement is better than previously and where the replacement interval of the doctor blade is longer than previously.
  • a characteristic feature of the doctor device according to the invention is that the holder devices are arranged to be fastened in connection with a blade holder so that the blade devices are further out than the doctor blade.
  • a characteristic feature of the blade arrangement according to the invention is that the blade devices are arranged before the doctor blade in the direction of rotation of the roll.
  • the blade devices remove a significant portion of the material at the edge areas of the doctor blade even before the doctor blade.
  • the short blade devices wear, but the costs caused by their replacement are considerably smaller than the cost of replacement of a full-length doctor blade.
  • the blade devices can be serviced even during production. In this way, it is possible to avoid quality deviations in the end product and to achieve as uninterrupted production as possible.
  • Figure 1 shows a finishing section of a fiber web machine which is known as such. Only the last drying cylinder 11 is presented of the dryer section 10 that precedes the finishing section.
  • the web forming machines are usually paper or board machines.
  • the consecutive production sections shown in Figure 1 are - in addition to the dryer section 10 - pre-calendering 12, coating 13 and calendering 14, after which the finished web is reeled with the reel 15.
  • This application represents so-called online finishing, where the web is fed from the dryer section directly to finishing without re-reeling. In order to minimize production losses, it is important to have disturbance-free production from the wet end to the reel.
  • Marked with X in the figure are example positions where the doctor arrangement according to the invention is preferably used.
  • roll 16 included in the fiber web machine is equipped with the doctor arrangement.
  • the doctor arrangement includes a doctor blade 18, which is here supported to the doctor beam 17 arranged in connection with the roll 16 ( Figure 2a ).
  • the doctor blade is primarily used for keeping the surface of the roll clean, but in certain positions it is also used for guiding the web into a pulper in a web break situation.
  • the doctor beam extends essentially across the width of the entire roll, and it is usually supported by bearings at both ends. By turning the beam 17, the doctor blade 18 can be placed against the surface of the roll 16 and also away from it.
  • the beam 17 can potentially also be moved in the axial direction.
  • the doctor arrangement also includes blade devices 19 which are separate from the doctor blade 18 and which are arranged at both edge areas 20 of the doctor blade 18 ( Figures 4a and 4b ).
  • the edge areas of the doctor blade correspond to the edge areas of the roll.
  • the roll 16 is a drying cylinder 21, which is placed after a coating station 22 included in a fiber web machine. The surface of the drying cylinder is hot, which contributes to the sticking of the coating slip.
  • the doctor arrangement according to the invention works in this position, too, and remains operational for a longer period than previously.
  • the coating slip contains substances such as kaolin, calcium carbonate or talc. These are very abrasive substances. Moreover, they accumulate easily on the surface of the roll, which makes the above-described doctor positions demanding. Doctor blades made even completely of carbon fiber are used in prior art arrangements. Such doctor blades are hard and endure wear, but they are expensive. Despite their wear-resistance, the doctor blades wear unevenly, so their replacement intervals are short.
  • the blade devices 19 are arranged before the doctor blade 18 in the direction of rotation of the roll 16. In this way, the blade devices first touch the material that has accumulated on the surface of the roll. In this case, most of the wear impact is directed at the blade devices, while the actual doctor blade is worn less. The doctor blade consequently wears more evenly than previously, which extends the service life of the doctor blade and reduces its need for replacement. At the same time, the material can be removed more efficiently from the surface of the roll.
  • Figure 2a shows the roll 16 in part only.
  • Figure 2b illustrates a prior art doctor blade 18 and doctor beam 17 with a broken line, and the doctor device according to the invention is illustrated with a solid line.
  • the doctor device is intended for a fiber web machine, and it includes blade devices 19 and holder devices 23.
  • the holder devices 23 are intended for the placement of the blade devices 19 in connection with the doctor blade 18 included in the fiber web machine, to the edge areas 20 of said doctor blade 18.
  • the holder devices 23 are arranged to be fastened in connection with the blade holder 38 so that the blade devices 19 are further out than the doctor blade 18. With respect to the fastening point of the doctor blade, the blade devices extend further out than the doctor blade, both in the blade direction and radially.
  • the holder devices 23 are thus arranged for the placement of the blade devices 19 before the doctor blade 18 in the direction of rotation of the roll 16.
  • the doctor device can be placed in connection with the doctor blade so that the blade devices are located before the doctor blade.
  • the blade devices 19 are also preferably supported to said doctor beam 17.
  • the holder devices 23 include a support structure 24, which has connecting devices 25 for fastening to the doctor beam 17 arranged to support the doctor blade 18.
  • the blade devices can be simply added to an existing doctor arrangement, and to put it more precisely, by fastening the connecting devices to the doctor beam.
  • FIGS 3a to 3c show one end of the doctor arrangement at a time.
  • the holder devices 23 according to the invention include a blade holder 26, which is fastened to a support strip 27.
  • the support strip 27 is at least as long as the blade holder 26.
  • the blade holder as such can be different from that presented, but here the applicant's own model provided with one loading hose has been used.
  • each blade device 19 includes a support arm 28.
  • the support arm 28 is connected to the support strip 27 by means of two connectors 29.
  • the fastening is carried out by means of two pairs of bolts 30, for which bolts there are elongated holes 37 in the support strip 27.
  • the support strip 27 can be adjusted with respect to the support arm 28.
  • the blade devices are loaded by means of a loading hose 32.
  • the installation of the doctor device according to the invention in connection with the doctor blade has been designed to be especially easy.
  • the blade devices 19, more precisely the support arm 28, is fastened to the doctor beam 17 using the same fastening devices 34 that support the doctor blade 18.
  • the doctor device can be fastened as long as bolts 34' that are longer than normally are used at the support arm 28.
  • the holder devices 23 according to the invention are symmetrical. In other words, there are almost identical blade holders at both ends of the roll, while the support arms of the doctor devices are mirror images of each other. In this case, spare parts such as a short doctor blade 35 can be used at either end.
  • the symmetrical design is illustrated especially in Figure 4a , where the doctor arrangement is viewed against the machine direction. At both ends of the short blade holder 26, there is a finger plate 36 by which the blade holder 26 can be moved.
  • the support strip 27 has two sets of elongated holes 37 for fastening to the support arm 28.
  • Figures 4a and 4b might suggest that the blade devices 19 are unnecessarily long.
  • the length of the holder devices 23 is 800 to 1,200 mm.
  • the blade devices 19 extend clearly beyond the edge areas 20.
  • 40 to 60 per cent of the length of the blade devices 19 extends beyond the edge areas 20.
  • the finger plate extends to a safe distance from the roll.
  • the blade holder can be moved by the finger plate also during production. This is why, if the short doctor blade wears locally, it can be moved somewhat manually, whereby the best doctoring result can be achieved at the most critical location. Moreover, the moving is possible without a safety risk.
  • the short doctor blade By depressurizing the loading hose and, if necessary, by using vacuum, the short doctor blade can be detached from the surface of the roll and hence the blade holder can be moved. If necessary, the entire blade holder with the doctor blade can be pulled off for service and replacement.
  • the part beyond the roll can also be utilized by exchanging the short doctor blades on the tending and drive sides with each other. In this way, even a short doctor blade can be utilized over its entire length. In the same manner, parts of the doctor blade that have worn unevenly can be removed, and it can be used for reconditioning several short doctor blades.
  • the width of a roll is currently from 4 to 10 meters, while the length of the blade devices according to the invention is from approximately 0.5 meters to approximately 1 meter.
  • the doctor device according to the invention comprises a first blade holder 26, which is short.
  • a short doctor blade 35 is supported to this short blade holder 26.
  • the short doctor blade 35 constitutes part of the blade devices 19.
  • Both the short blade holder and the short doctor blade extend over only a part of the width of the roll surface to be doctored, preferably over its edge areas.
  • the doctor blade 18 included in the doctor arrangement and the blade holder 38 that supports the doctor blade 18 extend essentially over the entire width of the roll to be doctored.
  • the doctor device according to the invention is simple and compact. Components proven in practice can be applied to it. If necessary, for example the blade holder is reinforced to increase the load resistance.
  • the doctor device can be placed in connection with various types of doctor blades. Two doctor devices can be used for updating a doctor arrangement quickly to a new level. In this way, the doctoring result is improved even though the replacement interval of the doctor blade extends at the same time. The effective production time is thus maximized while at the same time minimizing the maintenance costs.
  • a modern blade holder with a new type of doctor blade is preferably replaced in the doctor beam. In this way, the overall doctoring result of the doctor arrangement is improved and serviceability is facilitated.

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  • Paper (AREA)
  • Coating Apparatus (AREA)
EP15165020.7A 2014-04-01 2015-04-24 Doctor device for a fiber web machine and doctor arrangement in a fiber web machine Withdrawn EP2927369A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20145316A FI125275B (fi) 2014-04-01 2014-04-01 Kaavinlaite kuiturainakonetta varten ja kaavinsovitelma kuiturainakoneella

Publications (1)

Publication Number Publication Date
EP2927369A1 true EP2927369A1 (en) 2015-10-07

Family

ID=53396139

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15165020.7A Withdrawn EP2927369A1 (en) 2014-04-01 2015-04-24 Doctor device for a fiber web machine and doctor arrangement in a fiber web machine

Country Status (3)

Country Link
US (1) US20160138223A1 (fi)
EP (1) EP2927369A1 (fi)
FI (1) FI125275B (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017082803A1 (en) * 2015-11-13 2017-05-18 Valmet Ab Doctor arrangement for a disc filter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3399099A1 (en) * 2017-05-03 2018-11-07 Oradoc S.r.l. Rigid and flexible doctor blade holder and system comprising a cylinder and a doctor blade holder

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032229A (en) * 1989-11-08 1991-07-16 Albany International Corp. Doctoring device for papermaking machine
US6207016B1 (en) * 1998-05-14 2001-03-27 Ekstroem Lars Method for dividing a paper web
US20030057629A1 (en) * 2001-09-06 2003-03-27 Metso Paper, Inc. Method and arrangement in doctoring in a paper or board machine
DE102011081925A1 (de) * 2011-08-31 2013-02-28 Joh. Clouth Gmbh & Co. Kg Vorrichtung zum Halten von Schaberklingen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032229A (en) * 1989-11-08 1991-07-16 Albany International Corp. Doctoring device for papermaking machine
US6207016B1 (en) * 1998-05-14 2001-03-27 Ekstroem Lars Method for dividing a paper web
US20030057629A1 (en) * 2001-09-06 2003-03-27 Metso Paper, Inc. Method and arrangement in doctoring in a paper or board machine
DE102011081925A1 (de) * 2011-08-31 2013-02-28 Joh. Clouth Gmbh & Co. Kg Vorrichtung zum Halten von Schaberklingen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017082803A1 (en) * 2015-11-13 2017-05-18 Valmet Ab Doctor arrangement for a disc filter

Also Published As

Publication number Publication date
US20160138223A1 (en) 2016-05-19
FI125275B (fi) 2015-08-14
FI20145316A (fi) 2015-08-14

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