EP1740766B1 - Apparatus and method for a paper machine - Google Patents

Apparatus and method for a paper machine Download PDF

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Publication number
EP1740766B1
EP1740766B1 EP05717281A EP05717281A EP1740766B1 EP 1740766 B1 EP1740766 B1 EP 1740766B1 EP 05717281 A EP05717281 A EP 05717281A EP 05717281 A EP05717281 A EP 05717281A EP 1740766 B1 EP1740766 B1 EP 1740766B1
Authority
EP
European Patent Office
Prior art keywords
deckle rail
wire
deckle
rail
water
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.)
Not-in-force
Application number
EP05717281A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1740766A1 (en
Inventor
Hannu Karema
Johan ÅKERHOLM
Kenneth Eriksson
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.)
Process Flow Ltd Oy
Original Assignee
Process Flow Ltd Oy
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Filing date
Publication date
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Application filed by Process Flow Ltd Oy filed Critical Process Flow Ltd Oy
Publication of EP1740766A1 publication Critical patent/EP1740766A1/en
Application granted granted Critical
Publication of EP1740766B1 publication Critical patent/EP1740766B1/en
Not-in-force legal-status Critical Current
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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
    • D21F1/56—Deckle frame arrangements

Definitions

  • the object of the invention is an apparatus and a method in a paper machine and a paper machine according to the preambles of the independent claims presented below.
  • the invention especially relates to an edge support of a forming table in a paper machine.
  • FIG 1a there is shown a head box 1, fabric edge curler 2, an edge wave 3 indicated schematically by arrows and a deckle rail 4.
  • FIG 1 b there is further shown a wire 5 and a wearing plastic lip 15 used for sealing.
  • Edge support according to prior art is thus usually comprised of a short rod-shaped deckle rail 4 on the wire and fabric edge curler 2 to be performed thereafter, in which with the aid of formed pieces the edge section of the wire 5 is lifted off the table.
  • Drawbacks of a solution of this type are for example:
  • Document SU-A-590390 discloses a deckle rail with channels for water flow in the inner edge of the deckle rail.
  • the curved ribs define the direction of water flow through the channels for water flow between the deckle rail and the stock layer in order to reduce friction.
  • the main object of the present invention is to reduce or even to eliminate the problems found in the prior art described above.
  • the primary aim of the present invention is to eliminate significant shortcomings and problems related to current edge support, whereby the section of a paper or board web that corresponds to the edge areas can be improved in terms of quality and in accordance with the operating values of the machine.
  • the aim is to thus prevent the stock deficit caused by current technology and the leakage flow directed towards the edge of the wire in the edge areas of the web by extending the support of the deckle rail-type far downstream on the forming table.
  • Such mechanical support requires, depending on the type of implementation, a reduction in friction between the stock and deckle rail by means of so-called lubricating water as well as the hydraulic sealing of the gap between the deckle rail and the wire by means of so-called sealing water.
  • An aim of the present invention is especially to achieve a paper or board machine, which produces paper or board of a better quality than before. It is also an aim to achieve a more economical and manageable edge support of a forming table in a paper machine. It is a further aim of the invention to achieve an arrangement, in which the surface friction between the stock and the edge support is lower than that of arrangements of prior art. Moreover an aim of the invention is to improve adjustability of the edge support.
  • paper machine in general terms.
  • the term paper machine naturally also comprises board machines and other corresponding machines, which manufacture web from liquid containing stock.
  • a typical deckle rail of a forming table in a paper machine according to the invention comprises openings
  • a typical method according to the invention in the paper machine stock is fed on the wire of the forming table of the paper machine to form a stock layer and the edges of the stock layer are supported by a deckle rail placed on the wire. It is also characteristic for a typical method that in the method water is transported inside the deckle rail and the space between the deckle rail and the stock layer is lubricated by leading water from inside the deckle rail between the deckle rail and the stock layer, and/or the gap between the deckle rail and the wire is sealed by leading water from inside the deckle rail between the deckle rail and the wire.
  • water can also be led outside the deckle rail, from where it can be divided by means of a manifold, hoses or branching pipe to different parts of the deckle rail, from where it is further led between the deckle rail and stock layer and/or deckle rail and wire.
  • no fabric edge curler is required, however, it can nevertheless be used.
  • the invention relates to an apparatus in a paper machine, which apparatus comprises at least one deckle rail for supporting the edge of the stock layer on the wire of the forming table as well as means for leading water to the vicinity of the deckle rail.
  • a typical deckle rail of a forming table in a paper machine according to the invention further comprises openings or gaps in the inner surface of the deckle rail facing the wire for leading water between the deckle rail and the stock layer in order to lubricate this space and/or in the lower surface of the deckle rail for leading water directly between the deckle rail and the wire in order to seal the gap between the deckle rail and the wire with water.
  • deckle rails there are at least two deckle rails, one of which is typically in the machine direction on both sides of the stock layer arranged on the wire so that the stock layer can be supported on both sides.
  • deckle rails there can be for example 1, 2, 3, 4, 5, 6, 7, 9 or 12 deckle rails on both sides of the wire.
  • supporting the stock layer can also be meant limiting the stock layer.
  • the deckle rail according to one embodiment of the invention can be made of plate, in which has been arranged openings or gaps by boring or otherwise. Openings arranged in the inner side of the deckle rail facing the wire for feeding lubricating water can have a diameter of for example 1 - 5 mm. When using elongated gaps the height of the gaps can be for example 1 - 2 mm. Openings arranged in the lower surface of the deckle rail for feeding sealing water can have a diameter of for example 3 - 10 mm. When using elongated gaps the height of the gaps can be for example 2 - 8 mm.
  • the inner side of the deckle rail facing the wire and the lower surface according to the invention can typically be of a porous material, the structure of which comprises a large number of small openings.
  • a porous material When using a porous material the water flow is distributed particularly evenly on the entire surface area of the porous material.
  • the surface of the porous material is easily kept clean and lubrication and sealing function particularly well.
  • the deckle rail can be made of ceramics, metal or plastic, for example.
  • the deckle rail is long, extending almost from the head box almost to the dry line.
  • the deckle rail or a combination of deckle rail elements can regarding its length be for example 30-100 % of the length of the forming table, advantageously 50-99 % of the length of the forming table.
  • An arrangement according to the invention can for example start immediately at the end of the forming table or at a distance of about 1-50 cm therefrom. The arrangement can likewise end at the dry line or in the vicinity thereof.
  • the inner surface of the deckle rail is kept clean and the surface friction low with the aid of the lubricating water. Consequently the stock layer hardly attempts to stick to the surface of the deckle rail.
  • the deckle rail according to the invention can be formed by one long element or it can be formed by several shorter elements connected to each other. Connecting the elements to each other can be performed by any per se known method to someone skilled in the art.
  • the function of the deckle rail according to the invention can vary in different locations, for example the amount of lubricating water to be fed can differ according to need in different parts of the forming table.
  • An advantageous deckle rail according to the invention is substantially parallel or as parallel as possible with the travel direction of the wire. Thus, the formation of edge waves can be minimised.
  • the invention also relates to a method in a paper machine.
  • stock is fed on the wire of the forming table of the paper machine to form a stock layer and the edge of the stock layer is supported by at least one deckle rail placed on the wire.
  • water is brought inside the deckle rail and the space between the deckle rail and stock layer is lubricated by leading water from inside the deckle rail between the deckle rail and the stock layer, and/or the gap between the deckle rail and the wire is sealed by leading water from inside the deckle rail between the deckle rail and the wire.
  • the lubricating water is led through the inner edge of the deckle rail facing the wire directly between the deckle rail and the stock layer, whereby the advantages described above and below are attained.
  • the sealing water is led through the lower edge of the deckle rail facing the wire directly between the deckle rail and the wire.
  • water from the end of the deckle rail is fed substantially in the machine direction in order to support the edge of the stock layer arranged on the wire.
  • the invention also relates to a paper machine comprising a forming table which is characterised by an apparatus according to an embodiment of the invention in connection with the forming table,
  • the means for bending the edges of the wire upwards are lacking from the forming table of such a paper machine, that is as the arrangement described above is used, there is no need to bend the edges of the wire upwards.
  • the forming table there can be means for bending the edges of the wire upwards and the edges of the wire can be bent upwards, if it is considered necessary.
  • Figures 2a and 2b show the basic features of hydrodynamic edge support according to the first embodiment of the invention.
  • an arrangement is shown according to an embodiment of the invention as seen from above.
  • the arrangement comprises a head box 1, a wire section 6, a dewatering area 7 and a deckle rail 8 according to an embodiment of the invention.
  • a section of the arrangement in figure 2a is shown as seen from the end, and in particular the deckle rail 8 and the wire 5 have been depicted therein.
  • FIGS 2a and 2b it is shown a basic feature of typical hydrodynamic edge support according to the invention, that is that the support does not include fabric edge curler, that is raising the wire from the table, but is based on an element such as the deckle rail.
  • the deckle rail shown in figure 2a is long extending to such a distance from the head box, that a significant part of the dewatering taking place on the forming table has been effected and there is a filtered layer of paper or board stock on the wire.
  • FIG. 3 shows a deckle rail according to a second embodiment of the invention and the rail/laminated structure thereof as well as the use of sealing water for sealing.
  • the deckle rail 8 functions as a channel for lubricating water (indicated by arrows 9) and the gap between the deckle rail 8 and the wire 5 is sealed by sealing water.
  • stock 10, which can be paper or board stock, is schematically shown in the figure. Sealing is achieved in the fashion of a hydrodynamic sealing by bringing underneath the deckle rail 8 water having a smaller pressure loss and therefore the leakage flow towards the stock layer 10.
  • the sealing water is brought in the manner shown in Figure 3 through suitable gaps from inside the actual deckle rail 8.
  • the lower surface of deckle rail 8 has lamellas 11. By using lamellas 11 of different heights, the gap between the deckle rail 8 and the wire 5 can be altered and thus suitable pressure and flow conditions can be achieved.
  • Figures 4a and 4b show a deckle rail 8 according to a third embodiment of the invention and an example of how the surface of the deckle rail 8 is kept clean with sealing water 12 according to the invention and surface friction low in relation to the non-lubricated flow. Consequently, the stock layer 10 hardly attempts to stick to the surface of the deckle rail 8.
  • the deckle rail 8 functions as a channel to sealing water (shown schematically by arrow 12).
  • Figures 4a and 4b describe the situation in the last section of the deckle rail 8, in which for sealing the gap between the lower surface of the deckle rail 8 and the wire 5 a filtered layer 13 formed on the surface of the wire 5 and the flow resistance thereof can be used. Additionally the figures show the stock 10 on the filtered layer 13.
  • the feeding openings for sealing water are arranged on the inner surface 14 of the deckle rail 8, whereby the lubricating water 12 is efficiently fed directly between the deckle rail 8 and stock layer 10.
  • figures 4a and 4b also lubricating water layer 16 and the lamellas 11 on the lower surface of the deckle rail 8 are shown.
  • FIG 4b yet another alternative embodiment has been shown, in which the gap between the deckle rail 8 and the wire 5 has been increased relative to the thickness of the filtered layer 13.
  • the inner surface 14b of the deckle rail is of a porous material, the structure of which comprises a large number of small openings. While using a porous material the feeding of lubricating water 12 is distributed particularly evenly and the inner surface 14b of the deckle rail is kept very clean.
  • a deckle rail 8 and a suction box 17 for dewatering according to a fourth embodiment of the invention are shown in figure 5.
  • suction box 17 ends at the inner line of the deckle rail 8, so that dewatering does not take place from underneath the deckle rail 8, whereby the amount of sealing water can more closely be controlled and it easily remains low.
  • dewatering extends often outside the line defined by the deckle rail.
  • Figures 6a and 6b show an example according to a fifth embodiment of the invention of how the transport of water to the deckle rail 8 can be arranged.
  • water is transported to the deckle rail 8 by a tube 18a, which has branches 18b.
  • the tube 18a has a bypass manifold, from which water flows along hoses 18c to the deckle rail 8.
  • Figures 7a and 7b show the feeding of sealing water 19 at the end of the deckle rail 8 according to the sixth embodiment of the invention.
  • Sealing water 19 is fed substantially in the machine direction and according to opportunity at machine speed for supporting the edge of the stock layer 10 on the wire 5.
  • a raised deckle rail 8 according to Figure 7b is particularly well suited to a situation where the filtered layer 13 on the wire 5 is significant.
  • the lower edge of the deckle rail 8 ends at a point, where sealing water 19 is fed.
  • the upper edge of the deckle rail 8 continues further forward from the feeding point of sealing water 19, which solution can be called a raised deckle rail.
  • the thickness of the filtered layer grows in the machine direction at the same time as the stock layer becomes thinner.

Landscapes

  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP05717281A 2004-03-25 2005-03-17 Apparatus and method for a paper machine Not-in-force EP1740766B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20040454A FI115473B (sv) 2004-03-25 2004-03-25 Anordning och förfarande i pappersmaskin samt pappersmaskin
PCT/FI2005/000156 WO2005093154A1 (en) 2004-03-25 2005-03-17 Apparatus and method in a paper machine and a paper machine

Publications (2)

Publication Number Publication Date
EP1740766A1 EP1740766A1 (en) 2007-01-10
EP1740766B1 true EP1740766B1 (en) 2007-09-26

Family

ID=32039472

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05717281A Not-in-force EP1740766B1 (en) 2004-03-25 2005-03-17 Apparatus and method for a paper machine

Country Status (6)

Country Link
US (1) US20070267162A1 (sv)
EP (1) EP1740766B1 (sv)
AT (1) ATE374281T1 (sv)
DE (1) DE602005002646T2 (sv)
FI (1) FI115473B (sv)
WO (1) WO2005093154A1 (sv)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000497A1 (de) 2009-01-30 2010-08-05 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn
DE102009000502A1 (de) 2009-01-30 2010-08-05 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn
WO2011086231A1 (en) * 2010-01-15 2011-07-21 Metso Paper, Inc. Device for a web forming section of a fiber web machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120205B (sv) * 2007-03-28 2009-07-31 Vaahto Oy Förfarande och anordning vid en pappers- eller kartongmaskin för begränsning av massaströmningen från en inloppslåda
AT505931B8 (de) * 2007-11-19 2009-06-15 Andritz Ag Maschf Blattbildungsverfahren und nasspartie zur herstellung einer faserstoffbahn
US8236139B1 (en) * 2008-06-30 2012-08-07 International Paper Company Apparatus for improving basis weight uniformity with deckle wave control
CN110016830B (zh) * 2019-04-16 2023-06-20 华南理工大学 一种斜网成型器用的非接触式密封装置及方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI30095A (fi) * 1958-12-10 Valmet Oy Tapa syöttää paperilietettä perälaatikosta viiralle ja perälaatikko sen suorittamista varten
US2737088A (en) * 1952-04-22 1956-03-06 Millspaugh Ltd Paper-making machines
US3563854A (en) * 1966-08-06 1971-02-16 Voith Gmbh J M Sealing arrangement for a breast box of a papermaking machine
US3607624A (en) 1969-08-22 1971-09-21 Nekoosa Edwards Paper Co Inc Self-cleaning deckle rail for papermaking machines
SU590390A1 (ru) * 1976-02-09 1978-01-30 Центральный Научно-Исследовательский И Проектно-Конструкторский Институт По Проектированию Оборудования Для Целлюлозно-Бумажной Промышленности Форматна линейка дл бумагоделательной машины
US5045154A (en) * 1990-06-28 1991-09-03 Baluha Mark R Conveyor edge product containing device for paper making machinery
US5298127A (en) * 1992-10-23 1994-03-29 Westvaco Corporation Paper machine deckle support and flushing means
JPH07310297A (ja) * 1994-05-16 1995-11-28 Ishikawajima Harima Heavy Ind Co Ltd 抄紙機すき網部における無デッケル装置
DE19615503C2 (de) * 1996-04-19 1998-10-29 Voith Sulzer Papiermasch Gmbh Vorrichtung zum seitlichen Abdichten eines keilförmigen Spaltes in einer Doppelsiebpapiermaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000497A1 (de) 2009-01-30 2010-08-05 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn
DE102009000502A1 (de) 2009-01-30 2010-08-05 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer Faserstoffbahn
WO2011086231A1 (en) * 2010-01-15 2011-07-21 Metso Paper, Inc. Device for a web forming section of a fiber web machine
CN102713056A (zh) * 2010-01-15 2012-10-03 美卓造纸机械公司 用于纤维幅材机的幅材成形部的装置
EP2524083A1 (en) * 2010-01-15 2012-11-21 Metso Paper, Inc. Device for a web forming section of a fiber web machine
EP2524083A4 (en) * 2010-01-15 2013-05-29 Metso Paper Inc DEVICE FOR A FILM FORMING SECTION OF A FIBER FILM MACHINE

Also Published As

Publication number Publication date
FI20040454A0 (sv) 2004-03-25
DE602005002646T2 (de) 2008-07-17
WO2005093154A1 (en) 2005-10-06
DE602005002646D1 (de) 2007-11-08
US20070267162A1 (en) 2007-11-22
EP1740766A1 (en) 2007-01-10
FI20040454A (sv) 2005-03-21
FI115473B (sv) 2005-05-13
ATE374281T1 (de) 2007-10-15

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