EP2607548B1 - Runnability component for the drying section of a paper machine and method for drying a paper web - Google Patents

Runnability component for the drying section of a paper machine and method for drying a paper web Download PDF

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Publication number
EP2607548B1
EP2607548B1 EP12198076.7A EP12198076A EP2607548B1 EP 2607548 B1 EP2607548 B1 EP 2607548B1 EP 12198076 A EP12198076 A EP 12198076A EP 2607548 B1 EP2607548 B1 EP 2607548B1
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EP
European Patent Office
Prior art keywords
runnability component
suction
entry side
runnability
drying
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
EP12198076.7A
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German (de)
English (en)
French (fr)
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EP2607548A1 (en
Inventor
Kimmo Kaasinen
Nenad Milosavljevic
Kalle Muhonen
Jari-Pekka Pihajoki
Pekka Saarikivi
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
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Valmet Technologies Oy
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Publication of EP2607548A1 publication Critical patent/EP2607548A1/en
Application granted granted Critical
Publication of EP2607548B1 publication Critical patent/EP2607548B1/en
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Classifications

    • 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
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems
    • 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
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices

Definitions

  • the invention relates to a runnability component and a method for drying a paper web according to the preambles of the enclosed independent claims.
  • the web to be dried is conveyed supported by one or two wires in contact with a plurality of heated drying cylinders.
  • the paper web runs supported by a drying wire through a drying cylinder group so that the drying wire presses the web against the heated cylinder surfaces of the drying cylinders.
  • the drying cylinders are arranged outside the wire loop, and turn rolls are arranged inside the loop.
  • a pocket space is formed, which is defined by the wire and two adjacent drying cylinders and the turn roll situated between the drying cylinders at a different level.
  • An opening nip, or opening gap is formed on the entry side of the pocket space on an area where the drying wire separates from the first drying cylinder and, correspondingly, a closing nip, or a closing gap, is formed on the entry side of the pocket space when the wire runs to the turn roll.
  • an opening nip i.e. an opening gap
  • a closing nip i.e. a closing gap
  • Runnability problems occur, when the paper web has a tendency to detach, at certain points, from the contact with the drying wire.
  • Problematic points are especially the above described opening nips, i.e. points where the web and the wire disengage from the drying cylinder surface. Up to that point, the web has been travelling between the wire and the cylinder, and when the wire detaches from the cylinder, the web tends to follow the cylinder surface and thereby to disengage itself from the wire.
  • Similar problems occur at closing nips, where the web and the wire are brought into contact with the cylinder surface. At that point, the web tends to disengage from the wire due to an overpressure formed in the nip.
  • Runnability components are arranged in the pocket space between the succeeding drying cylinders and the turn roll.
  • Runnability components are used to create suitable underpressure in the pocket space, which promotes the keeping of the web in contact with the wire and improves the runnability of the dryer section of a paper machine.
  • Blow boxes are typically used in connection with grooved and drilled vacuum turn rolls, where the air is sucked into the roll through holes in the roll shell.
  • the suction is created by using a vacuum forming device, such as a fan or the like, which is arranged in connection with the interior of the roll.
  • the underpressure inside the vacuum turn roll is typically about 2000 - 2500 Pa.
  • suction boxes are typically used with so-called passive turn rolls, which have cut-outs in the roll shell.
  • Suction box which is arranged in the pocket space at the portion of the turn roll free from the wire, is arranged to suck air through the cut-outs of the turn roll.
  • the open area of the passive roll is relatively large, typically around 4 - 10, more typically 6 - 8 %.
  • the interior of the passive roll has normally no direct connection with the vacuum forming devices.
  • EP 1194641 discloses a method and apparatus in the drying section of a paper machine or the like.
  • An object of this invention is to minimise or even totally eliminate the disadvantages existing in the prior art.
  • An object is also to provide a runnability component with which a good underpressure can be created to the pocket space and which can be used together with different types of turn rolls.
  • a further object of the invention is to provide a runnability component enabling good control of the different underpressure zones in the pocket space.
  • Another object of the invention is to provide an alternative method for creating the required underpressure in the pocket space, especially suitable for rebuild applications.
  • the runnability component according to the present invention for a drying section of a paper machine is defined in claim 1 and comprises
  • the method according to the present invention for drying a paper web or the like in a drying section of a paper machine is defined in claim 10 and comprises
  • the underpressure in the pocket space can be enhanced by sucking air from the area between the lower surface of the runnability component and the turn roll by first suction means arranged to the lower surface of the runnability component, which also comprises a blowing element on the entry side for creating the underpressure. Furthermore, it has been found out that the underpressure in the pocket space can be more accurately, efficiently and easily controlled for each operational situation by adjusting the size of the suction holes or width of the suction gap, which forms the first suction element. The air is sucked from the interior of the turn roll through the cut-outs on the roll shell, thus creating at least a part of the necessary underpressure in the turn roll to stabilise the turning path of the wire and the web over the turn roll surface.
  • the invention enables use of runnability components with blowing elements also in connection with turn rolls with high open shell area without extensive increase in used air volumes and energy consumption.
  • the present invention combines the good runnability and sealing of the pocket space towards the wire on the entry side of the runnability component that are traditionally achieved with a blow-box with a use of a passive turn roll, while providing good control of the underpressure in the pocket space due to the adjustable first suction element.
  • the runnability component is arranged in a pocket space, which is defined by the first and second drying cylinder and a turn roll between them.
  • the drying cylinders are parallel, i.e. their longitudinal axes are parallel with each other, and they are arranged at a distance from each other.
  • the adjacent drying cylinders are arranged horizontally on the same level and the turn roll is arranged between the two adjacent drying cylinders so that the longitudinal axis of the turn roll is substantially parallel with the longitudinal axes of the drying cylinders, but located on a different level in the vertical direction than the axes of the drying cylinders.
  • the turn roll is thus arranged on a higher or lower level than the drying cylinders, typically on a lower level.
  • the turn roll is placed between the drying cylinders so that its surface does not touch the surfaces of the drying cylinders, i.e. is free from contact with the drying cylinder surfaces.
  • the box-like runnability component, the drying cylinders and the turn rolls are elongated in the cross direction of the paper machine or the like, and extend substantially over the entire width of the web run. Therefore the pocket space defined by them is also elongated in the cross direction of the paper machine.
  • the ends of the pocket space are typically sealed, for example by means of end plates according to prior art, such as gap plates.
  • the vertical end plates are arranged in machine direction, on both ends of the pocket space.
  • the pocket space may be divided, in machine cross direction at its centre point, by an imaginary vertical level having the width of the web run into an entry side and an exit side.
  • the pocket space On the entry side, i.e. between the first drying cylinder and the turn roll, and on the exit side, i.e. between the turn roll and the second drying cylinder, the pocket space is delimited by the wire, and therefore, during the operation of the paper machine, also by the web path formed by the wire and the web.
  • the lower surface of the runnability component means the surface of the runnability component, which is located nearest to the turn roll, and which is arranged substantially towards the turn roll.
  • a higher underpressure means a lower absolute pressure.
  • a lower underpressure means a higher absolute pressure.
  • An underpressure means a pressure, which is lower than the normal atmospheric pressure ca. 1 bar, i.e. 100 kPa.
  • the runnability component comprises a first blowing element, which is arranged in connection with the entry side surface of the runnability component to blow air upwards.
  • the first blowing element on the entry side is arranged at the opening nip between the wire and the cylinder, for blowing air away from the gap between the wire and the runnability component.
  • the air jet discharging from the first blowing element maintains a negative pressure in the space between the runnability component and the web, and creates a negative pressure space at the opening nip on the entry side.
  • the first blowing element may be a blow nozzle or a blowing gap, extending from the first end towards the second end of the runnability component, preferably to the second end of the runnability component.
  • the blow nozzle diameter or gap width of the first blowing element is typically 1 - 3 mm, preferably 1.5 - 2.5 mm.
  • the nozzle diameter or gap width may be 0.1 mm - 0.5 mm.
  • the runnability component comprises also a first sealing element, which is arranged in connection with the entry side surface of the runnability component, beneath the first blowing element.
  • the first sealing element is arranged at a short distance from the opening nip between the wire and the cylinder, to project from the surface of the runnability component towards the wire and dividing the entry side surface into a first region and a second region.
  • the first sealing element divides thus the negative pressure space on the entry side into a first region of an intensified negative pressure confined to the location of the opening nip and into a second region of a lower negative pressure, i.e. lower underpressure, at the lower part of the pocket space on the entry side, near the closing nip of the entry side.
  • the first sealing element may be a mechanical sealing element, such as a sealing strip or a labyrinth sealing, such as single-chambered labyrinth sealing or multi-chambered labyrinth sealing.
  • the material of the mechanical sealing element may be, for example, Teflon, plastic, rubber, composite or metal, such as steel or aluminium. A requirement for the material is a sufficient rigidity, with which the free flow of air may be prevented.
  • the first sealing element is a mechanical sealing element, which is made of Teflon or of material comprising carbon fibres.
  • the lower surface of the runnability component is provided with a first suction element.
  • the first suction element removes air from the pocket space, from the space between the lower surface of the runnability component and the turn roll.
  • the first suction element is also used for creating a underpressure to the turn roll, as the suction of the first suction element creates an air flow through the open areas of the turn roll surface from the inside of the turn roll to the space between lower surface of the runnability component and the turn roll.
  • the first suction element is connected to a suction channel, arranged inside the runnabilty component, as described later in the application.
  • the first suction element is formed by at least one suction gap or by at least one row of suction holes, extending from the first end of the runnability component towards the second end, preferably to the second end, of the runnability component.
  • the first suction element may also comprise a plurality of adjacent suction gaps or rows of suction holes.
  • the first suction element may preferably comprise 2 - 4 adjacent rows of suction holes or adjacent suction gaps.
  • the suction holes may have a diameter of 15 - 50 mm, preferably 20 - 40 mm, and the distance between two adjacent holes in a row is typically 50 - 500 mm, preferably 150 - 350 mm.
  • the width of the gap is 2 - 10 mm, typically 2 - 4 mm, preferably 2 - 3 mm.
  • the form of the suction holes may be selected freely, for example they may be circular or oval-shaped.
  • the suction through the lower surface of the runnability component is controlled by adjusting the suction of the first suction element according to the requirements of one or several of the process parameters, such as web speed, web tension or weight of the paper web which is produced. It is possible to adjust the suction of the first suction element by adjusting the size of the suction holes or the width of the suction gap with adjustment means.
  • the runnability component comprises means for adjusting the size of the suction holes or the width of the suction gap of the first suction element.
  • the adjustment means may be, for example, a movable hole plate, which is arranged on top of the suction hole row in the cross direction of the paper machine. When the holes of the hole plate and the suction holes completely overlap, the suction is as the strongest. When the hole plate is moved, the overlap of the holes of the hole plate and the suction holes decrease, and the suction through the suction holes is reduced.
  • the runnability component further comprises a second suction element, which is arranged on the entry side surface of the runnability component, beneath the first sealing element, the second suction element being formed by at least one suction gap or by at least one row of suction holes, extending from the first end of the runnability component towards the second end of the runnability component, preferably to the second end of the runnability component.
  • the second suction element is thus arranged to remove air by suction from the negative pressure space on the entry side of the runnability component.
  • the second suction element may be connected to a suction channel, which is arranged inside the runnability component, as described later in the application.
  • the second suction element may also comprise a plurality of adjacent suction gaps or rows of suction holes.
  • the second suction element may preferably comprise 2 - 4 adjacent rows of suction holes or adjacent suction gaps.
  • the suction holes may have a diameter of 15 - 50 mm, preferably 20 - 40 mm, and the distance between two adjacent holes in a row is typically 50 - 500 mm, preferably 150 - 350 mm.
  • the width of the gap is 2 - 10 mm, typically 2 - 4 mm, preferably 2 - 3 mm.
  • the form of the suction holes may be selected freely, for example they may be circular or oval-shaped.
  • the second suction element comprises means for adjusting suction through the second suction element.
  • the suction effect of the second suction element is adjusted for controlling the suction from the negative pressure space through the entry side surface of the runnability component according to the requirements of the process parameters, such as web speed, web tension or weight of the paper web which is produced.
  • the second suction element may be attached to a connection provided with a damper with which the direct suction from the negative pressure space between the entry side of the runnability component and the wire may be adjusted. It is also possible to adjust the suction of the second suction element by adjusting the size of the suction holes or the width of the suction gap with adjustment means.
  • the runnability component comprises second means for adjusting the size of the suction holes or the width of the suction gap of the second suction element.
  • the second adjustment means may be, for example, a movable hole plate, which is arranged on top of the suction hole row in the cross direction of the paper machine. When the holes of the hole plate and the suction holes completely overlap, the suction is as the strongest. When the hole plate is moved, the overlap of the holes of the hole plate and the suction holes decrease, and the suction through the suction holes is reduced.
  • the first and/or second suction element may be connected to an external suction device or vacuum air system. It is possible to connect the suction element(s) to existing suction air systems intended for creating an underpressure to the pocket space or for the turn roll. This is advantageous when existing paper machine constructions are rebuilt, as no new suction systems need to be built, which saves time, costs and usually also space.
  • the suction of the first and/or second suction means may be adjusted according to the process parameters and/or process situation.
  • the first and/or second suction means may be connected to the external suction device or vacuum air system with a connection, which is provided with a regulating means for regulating the air flow, such as valve or a throttle.
  • the regulating means may be automatically adjustable or they may be adjustable manually.
  • the runnability component comprises at least one second sealing element, preferably a plurality of second sealing elements, arranged in connection with the lower part of the runnability component, preferably with the lower surface of the runnability component.
  • the second sealing element(s) may be arranged to extend outwards from the surface of the runnability component.
  • the second sealing element may be a mechanical sealing element or a sealing blow nozzle, preferably a mechanical sealing element.
  • the at least one second sealing element is arranged to seal the gap between the runnability component and the turn roll, in order to intensify the suction from the turn roll to the runnability component and from the space between the lower surface of the runnability component and the turn roll.
  • the second sealing element also helps to guide the air flow, which moves the exit side surface of the turn roll, in the rotational direction of the roll, away from the contact with the surface of the turn roll.
  • the second sealing element is a sealing blow nozzle
  • it is provided on the exit side surface of the runnability component, i.e. on the side of the opening nip from the turn roll.
  • the control of the underpressure in the pocket space between the drying cylinders and the turn roll may be improved with the second sealing element, which is an exit side sealing blow nozzle with which air is ejected out of the pocket space and/or the entry of the air into the pocket space via the gap between the exit side surface of the runnability component and the second drying cylinder is prevented.
  • the second sealing element When the second sealing element is a mechanical sealing element, the second sealing element extends outwards from the lower part, preferably lower surface, of the runnability component, preferably towards the turn roll.
  • the second sealing element is arranged to the lower surface of the runnability component on the exit side.
  • the mechanical second sealing element is arranged at at least one, preferably at both lower corners of the runnability component, extending towards the surface of the turn roll.
  • the mechanical second sealing element(s) serve(s) as a concrete physical obstacle(s) for the entry of air into the space between the runnability component and the turn roll. Thus, only a minute amount of air possibly enters into the said space.
  • the second mechanical sealing element may be a mechanical sealing element, such as a sealing strip or a labyrinth sealing, such as single-chambered labyrinth sealing or multi-chambered labyrinth sealing.
  • the material of the mechanical sealing element may be, for example, Teflon, plastic, rubber, composite or metal, such as steel or aluminium. A requirement for the material is a sufficient rigidity, with which the free flow of air may be prevented.
  • the second sealing element is a mechanical sealing element, which is made of Teflon or of material comprising carbon fibres.
  • the first and second sealing elements may be similar to each other or they may be different from each other.
  • the first and/or second sealing element is a mechanical sealing element, which is provided with means for adjusting the distance of the sealing element(s) to the turn roll or the drying cylinder.
  • the length of the sealing element extending outwardly from the surface of the runnability component may be adjusted with the adjusting means. For example, the distance between the first drying cylinder surface and the first sealing element may be adjusted according to the needs of the process situation, and air may be leaked to the pocket space or to the intensified negative pressure space at the opening nip on the entry side, if need be.
  • the distance between the second sealing element(s) and the turn roll may be adjusted and the air leaked to the area between the lower surface of the runnability component and the turn roll.
  • the first and/or second sealing element(s) create(s) such an effective sealing that the underpressure in the pocket space or at the opening nip is significantly enhanced.
  • the location of the second sealing element may then be adjusted further away from the turn roll, whereby a gap between the second sealing element and the turn roll is formed or increased. From this gap air may be allowed to leak to the pocket space or to the space between the lower surface of the runnability component and the turn roll from the opening nip on the exit side.
  • the first and second mechanical sealing elements are preferably elongated in the cross direction of the paper machine or the like and extend substantially over the entire width of the web run.
  • the first and/or second sealing element are mechanical sealing elements which are formed of at least two parts, preferably of several parts, in the lateral direction, i.e. cross direction, of the machine. Thus their mounting, transportation and storage is easier.
  • the runnability component may comprise a by-pass channel leading from a first region on the entry side to the second region on the entry side of the runnability component.
  • the by-pass channel enables a more precise control of the underpressure difference between the first and second region in the negative pressure space at the opening nip on the entry side. This improves also the overall pressure balance in the pocket space, whereby the operation of the turn roll may be considerably intensified and the control of the web may be enhanced with low energy consumption.
  • the by-pass channel allows air to be transferred between the first and second pressure region, which makes it possible to control the underpressure by adjusting the flow, for example to balance the pressure differences between the first and second pressure region in a desired manner.
  • a valve, a throttle or other device or means adjusting the air flow in the by-pass channel is arranged in the by-pass channel.
  • the by-pass channel may therefore be considered as a controlled active leak channel.
  • the by-pass channel is preferably elongated in the cross direction of the paper machine or the like and extends substantially over the entire width of the web run.
  • the runnability component may comprise a by-pass channel leading from the entry side of the runnability component to the exit side of the runnability component or to the upper surface of the runnability component.
  • by-pass channel may be used for balancing the pressure conditions in the first and/or second region on the negative pressure space on the entry side. If the underpressure on the entry side is too high the by-pass channel leading to the exit side or to surroundings may be opened, which leads reduced underpressure on the entry side.
  • a second blowing element is arranged in connection with the entry side surface, beneath the first sealing element.
  • the second blowing element may be a blow nozzle or a blowing gap, arranged on the first underpressure region.
  • the second blowing element extends from the first end towards the second end of the runnability component, preferably to the second end of the runnability component.
  • the second blowing element may be arranged to blow upwards, against the moving direction of the wire.
  • the goal is to intensify the underpressure level especially in the closing nip on the entry side and generally in the negative pressure region on the entry side, which makes the prevention of the wire bending more accurate and easy.
  • the second blowing element creates an air cushion which prevents the pumping/pulsating effect, otherwise typical for suction.
  • the blow nozzle diameter or gap width of the second blowing element is typically around 2 - 3 mm, and the blow speed 10 - 50 m/s, preferably 20 - 40 m/s.
  • the air which is ejected from the second blowing element may be led to a second suction element, arranged above the second blowing element. By means of the second suction element the air from the second blowing element is led to the suction channel inside the runnability component.
  • the second blowing element is arranged to blow into the by-pass channel extending from the entry side of the runnability component, especially into a by-pass channel leading from the entry side of the runnability component to the exit side of the runnability component or to the upper surface of the runnability component.
  • the runnability component preferably comprises a suction channel extending from the first end to the second end of the runnability component, and a blow channel extending from the second end to the first end of the runnability component.
  • the suction channel and blow channel are arranged inside the runnability component, inside the space, which is defined by the outer walls, i.e. surfaces, of the runnability component.
  • the blow channel is arranged at the upper part of the runnability component and the suction channel is arranged at the lower part of the runnability component, beneath the blow channel.
  • the runnability component comprises a tapering suction channel extending from the first end to the second end of the runnability component and a tapering blow channel extending from the second end to the first end of the runnability component.
  • Tapering suction and blow channels are advantageous as they enable the keeping of the pressure on even level along the length of the channels, in cross direction of the paper machine, and they minimise the pressure losses in the channels between the first and the second end of the runnability component.
  • the runnability component comprises an inclined division wall extending from the first end to the second end and dividing the inner volume of the runnability component into tapering suction channel and tapering blow channel.
  • the suction channel and the blow channel may be connected to adjustment means for adjusting the air flows to and/or from the runnability components.
  • the air flows are preferably controlled independently from each other, i.e. the suction in the suction channel and the blow in the blow channel of the runnability component are controlled independently from each other.
  • the runnability component comprises a tail threading zone.
  • the tail threading zone may be located, with respect to the web run, on the tending side and/or on the driving side, in the area of the first end and/or the second end of the runnability component.
  • the suction force in the tail threading zone may be controlled into one value and after the tail threading, i.e. in a normal running situation with a wide web run, to a second value.
  • the tail threading zone is defined by a dividing wall arranged inside the runnability component, dividing the suction channel it a tail threading zone and normal operation zone.
  • the dividing wall is normally vertical and it is arranged perpendicular to the length axis of the runnability component, i.e. the dividing wall is vertical and arranged parallel with the machine direction and with direction of web movement.
  • the adjustment of suction force between the tail threading zone and the normal operation zone may be achieved by appropriate control means.
  • the tail threading zone may be connected to a separate and individual suction means, which are controlled independently from the suction devices or the like that create the suction to the normal operation zone of the suction channel.
  • the control of the suction force at the tail threading zone and at the normal operation zone is achieved by using an integrated control means.
  • the integrated control means comprise a first and a second coaxial pipe with different diameter.
  • the first pipe is in contact the suction element of the tail threading zone and the second pipe is in contact with the suction element of the normal operation zone.
  • Both the first and the second pipe of the integrated control means are in contact with the suction device or vacuum air system.
  • a damper is arranged to the second pipe, so that the air flow through it may be restricted or totally terminated.
  • the suction When the damper is open, the suction is evenly divided to both the first and the second pipe, and the suction through suction element on the tail threading zone is equal to the suction through the suction element on the normal operation zone.
  • the damper When the damper is partially or wholly closing the second pipe, the suction is mainly or only occurring through the first pipe, i.e. mainly or only through suction element on the tail threading zone.
  • the cross section of the first pipe is circular and cross section of the second pipe is angular, preferably rectangular.
  • the turn roll used in connection with the invention may be a perforated turn roll, a grooved turn roll or a turn roll provided with both perforations and grooves, known per se.
  • the turn roll has an open area of at least 4 %, preferably 4 - 10 %, more preferably 6 - 8 %. This means that the surface of the turn roll comprises a large amount of cut-outs, such as perforations.
  • the turn roll is typically so-called passive turn roll, which means that the turn roll is free of internal suction devices. In other words, there are no internal suction devices or suction connections to the turn roll but the air is sucked from the turn roll, through the cut-outs on its surface, by external suction means, elements or devices, arranged in the runnability component.
  • the runnability component comprises a distribution chamber, which is arranged on the entry side surface of the runnability component.
  • the distribution chamber comprises a front plate, and it extends from the first end of the runnability component towards the second end of the runnability component, preferably to the second end of the runnability component.
  • the front plate may be attached on the entry side surface of the runnability component by welding, or by using attachment means, such as bolts, rivets, or the like.
  • the distribution chamber is preferably formed beneath the first sealing element, on the area between the opening nip of the first drying cylinder and the closing nip of the turn roll.
  • the front plate comprises at least one row of leak holes, preferably a plurality of parallel rows of leak holes.
  • the diameter of a single leak hole may be 15 - 50 mm, preferably 20 - 40 mm and the distance between the adjacent leak holes in a row is typically 150 - 350 mm, preferably 200 - 300 mm.
  • the web bending at and after the first drying cylinder may be controlled by distributing leak air by the distribution chamber arranged on the entry side surface of the runnability component.
  • the web bending at the opening nip of the first drying cylinder increases the negative pressure in the space between the web and the runnability component.
  • the increased negative pressure in its turn increases the web bending, thus leading to a vicious circle.
  • This negative phenomenon may be counteracted by distributing a small amount of leak air through the holes in the front plate of the distribution chamber.
  • the control of the web bending is clearly improved and the runnability of the web increased.
  • a transversal flow may be arranged to the distribution chamber by bringing the leak air into the distribution chamber from the ends of the chamber.
  • Regulating means such as a damper or the like, may be arranged on the end(s) of the distribution chamber to control the flow to the distribution chamber.
  • FIG. 1 shows a schematic general view of a pocket space 9 between two drying cylinders 1, 2 and one turn roll 3 in the drying section of a paper machine.
  • the pocket space 9 is delimited by a first drying cylinder 1, a second drying cylinder 2, a turn roll 3 and a web run 5a, 5b. Described more in detail, the pocket space 9 is delimited, on its entry side 9a, by a web run 5a between the first drying cylinder 1 and the turn roll 3, and on the exit side 9b of the pocket space, by a web run 5b between the turn roll 3 and the second drying cylinder 2.
  • the location of the turn roll in a horizontal direction x and in a longitudinal direction L of the paper machine is between the drying cylinders 1, 2, but in a vertical direction y lower than said cylinders 1, 2.
  • the directions of rotation of the cylinders 1, 2 are shown by arrows R. It is to be understood, that the above-presented arrangement is repeated by its substantial parts in the drying section of a paper or a board machine.
  • Figure 2 shows an arrangement according to a first embodiment of the present invention.
  • a runnability component 10 is arranged in connection with a pocket space between the drying cylinders 1, 2 and the turn roll 3 of a paper machine.
  • the entry side 10a of the runnability component 10 is provided with a first blowing element 11, such as a blow nozzle.
  • the first blowing element 11 blows air upwards, as indicated with arrow 13, against the travel direction of the paper web, which is guided from the first drying cylinder 1 to the turn roll 3, in order to create an intensified first negative pressure space 91 on the entry side 10a.
  • the first blowing element 11 ejects air away from the pocket space and prevents the air entailed by the web from entering into the pocket space via the gap between the first drying cylinder 1 and the entry side 10a of the runnability component.
  • a blow channel 12, which communicates with the first blowing element 11, is arranged inside the upper part of the runnability component 10.
  • the first sealing element 20 is arranged beneath the first blowing element 11 and it divides the surface of the entry side 10a into a first region and a second region. At the same time the first sealing element 20 divides the negative pressure space on the entry side of the pocket space into an intensified first negative pressure space 91 and a second negative pressure space 92.
  • the lower surface of the runnability component 10 is provided with a first suction element.
  • the first suction element comprises three parallel rows 31, 31', 31" of suction holes, through which the air is sucked from the space 93 between the turn roll 3 and the lower surface of the runnability component 10.
  • a suction channel 32 is arranged inside the lower part of the runnability component 10. The suction created by the suction channel 32 removes also air from the interior of the turn roll 3, through cut-outs or perforations on the surface of the turn roll 3. The air flows are indicated with arrows.
  • Second sealing elements 19, 19' such as sealing strips are arranged in connection with the lower part of the runnability component 10.
  • the purpose of the second sealing elements 19, 19' is to intensify the suction from the suction space 93 between the lower surface of the runnability component and the turn roll and prevent leakage of air to the suction space 93.
  • the second sealing element 19' guides also the air flow 16 so that it does not enter the suction space 93 but is guided after the opening nip 8b of the turning suction roll 3 on the exit side away from the pocket space in the direction of the web run 5b.
  • Figure 3 shows an arrangement according to a second embodiment of the present invention.
  • a runnability component 10 is arranged in connection with a pocket space between the drying cylinders 1, 2 and the turn roll 3 of a paper machine.
  • the structure of the runnability component 10 corresponds generally to that what is presented in Figure 2 , except that the lower surface of the runnability component 10 is provided with a first suction element, which comprises two parallel suction gaps 31, 31', through which the air is sucked from the suction space 93 between the turn roll 3 and the lower surface of the runnability component 10.
  • the runnability component 10 comprises one second sealing element 19, such as sealing strip, which is arranged in connection with the lower part on the entry side 10a of the runnability component 10.
  • Another second sealing element which is an exit side blow nozzle 15, is arranged on the exit side 10b of the runnability component 10.
  • the exit side blow nozzle 15 blows air in the travelling direction of the web run 5b according to arrow 14, and thereby ejects air away from the pocket space and prevents the air from entering into the pocket space via the gap between the exit side 10b of the runnability component 10 and the second drying cylinder 2.
  • the exit side blow nozzle 15 is connected to the blow channel 12 arranged inside the runnability component 10.
  • FIG 4 shows an arrangement according to a third embodiment of the present invention.
  • a runnability component 10 is arranged in connection with a pocket space between the drying cylinders 1, 2 and the turn roll 3 of a paper machine.
  • the structure of the runnability component 10 corresponds generally to that what is presented in Figure 2 , except that the lower surface of the runnability component 10 is provided with a first suction element, which comprises two parallel rows 31, 31' of suction holes, through which the air is sucked from the suction space 93 between the turn roll 3 and the lower surface of the runnability component 10.
  • a second suction element 33 is arranged on the entry side 10a of the runnability component 10, beneath the first sealing element 20. The second suction element removes air from the second negative pressure space 92, and thus intensifies the overall underpressure in the pocket space.
  • the second suction element 33 is connected to the suction channel 32 arranged inside the lower part of the runnability component 10.
  • Figure 5 shows an arrangement according to a fourth embodiment of the present invention.
  • a runnability component 10 is arranged in connection with a pocket space between the drying cylinders 1, 2 and the turn roll 3 of a paper machine.
  • the structure of the runnability component 10 corresponds generally to that what is presented in Figure 2 .
  • the entry side 10a of the runnability component 10 is provided with a by-pass channel 22, which is extending between the first negative pressure space 91 and the second negative pressure space 92.
  • the by-pass channel 22 may be used to regulate, for example, to balance, the underpressures of or the pressure difference between the negative pressure spaces 91, 92 in a controlled and desired manner.
  • Figure 6 shows an arrangement according to a fifth embodiment of the present invention.
  • a runnability component 10 is arranged in connection with a pocket space between the drying cylinders 1, 2 and the turn roll 3 of a paper machine.
  • the runnability component 10 comprises a by-pass channel 25 leading from the entry side 10a of the runnability component 10 to the exit side 10b of the runnability component 10.
  • the by-pass channel 25 may be used for balancing the pressure conditions in the second negative pressure space 92 on the entry side 10a.
  • a second blowing element is arranged to blow into the by-pass channel 25.
  • Figure 7 shows an arrangement according to a sixth embodiment of the present invention.
  • the runnability component 10 in Figure 7 corresponds to that presented in Figure 2 .
  • a distribution chamber 4 is arranged on the entry side 10a of the runnability component 10.
  • the distribution chamber 4 has a front plate, which is attached on the entry side surface of the runnability component 10 beneath the first sealing element 20.
  • the front plate comprises parallel rows 16, 16' of leak holes.
  • the web bending at the second negative pressure space 92 is controlled by distributing leak air from the distribution chamber 4 through the rows 16, 16' of the leak holes.
  • the leak air is supplied to the distribution chamber 4 from the ends of the chamber 4, whereby a transversal flow is created.
  • Regulating damper (not shown) can be arranged on the end of the distribution chamber 4 to control the inflow to the distribution chamber.
  • Figure 8 shows an arrangement according to seventh embodiment of the present invention.
  • Runnability component 10 is presented without the entry side cover plate and without tending side end plate.
  • the interior of the runnability component comprises a tapering suction channel 32 and a tapering blow channel 12.
  • the suction channel inlet 17 extends from the first end 10' of the runnability component 10 on tending side to the second end 10" on the driving side, through the whole runnability component 10.
  • the blow channel 12 extends from the second end 10" to the first end 10' of the runnability component 10.
  • An inclined division wall 21 is arranged inside of the runnability component 10 for dividing its inner volume into the tapering suction channel 32 and tapering blow channel 12.
  • the diameter of suction and blow channels 32, 12 are uniformly decreasing from the channel inlets 17, 18 onwards. This counteracts the pressure decrease in the channels 32, 12.
  • Figure 8 shows also a tail threading zone 42, which is arranged on the first end 10' of the runnability component 10.
  • the tail threading zone 42 is defined by a dividing wall 40 arranged inside the runnability component 10.
  • the wall 40 divides the suction channel 32 in a tail threading zone and a normal operation zone.
  • the wall 40 is normally arranged perpendicular to the length axis of the runnability component 10.
  • the suction between the tail threading zone 42 and the normal operation zone can be changed by using control means integrated to the suction channel inlet 17.
  • control means comprise a first circular pipe element 43 and a second rectangular pipe element 44.
  • the second pipe element 44 is arranged inside the first pipe element 43 and coaxially with it.
  • the pipe elements 43, 44 have different diameter.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP12198076.7A 2011-12-20 2012-12-19 Runnability component for the drying section of a paper machine and method for drying a paper web Not-in-force EP2607548B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20116291A FI20116291A (fi) 2011-12-20 2011-12-20 Ajettavuuskomponentti, järjestelmä ja menetelmä paperin kuivaamiseksi

Publications (2)

Publication Number Publication Date
EP2607548A1 EP2607548A1 (en) 2013-06-26
EP2607548B1 true EP2607548B1 (en) 2014-07-16

Family

ID=47520759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12198076.7A Not-in-force EP2607548B1 (en) 2011-12-20 2012-12-19 Runnability component for the drying section of a paper machine and method for drying a paper web

Country Status (4)

Country Link
EP (1) EP2607548B1 (zh)
CN (1) CN103174050B (zh)
CA (1) CA2799114C (zh)
FI (1) FI20116291A (zh)

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Publication number Priority date Publication date Assignee Title
FI128229B (fi) * 2015-05-04 2020-01-15 Valmet Technologies Inc Jälkiasennussarja, ajettavuuskomponentti ja menetelmä imulaatikon modifioimiseksi
FI11634U1 (fi) 2017-03-09 2017-04-27 Valmet Technologies Oy Ajettavuuskomponentti ja järjestely kuiturainakoneen kuivatusosaa varten
FI129277B (en) * 2020-10-26 2021-11-15 Valmet Technologies Oy Runnability component of the drying section
FI20225998A1 (fi) * 2022-11-04 2024-05-05 Valmet Technologies Oy Menetelmä ja järjestelmä alipainelaitteiston säätämiseksi kuiturainakoneella
CN117284850B (zh) * 2023-11-27 2024-02-23 江苏西奥医用材料有限公司 一种用于医用透析纸的卷收平整装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4314475A1 (de) * 1993-05-03 1993-12-23 Voith Gmbh J M Anordnung zum Führen einer zu trocknenden Bahn
FI110625B (fi) * 1999-02-22 2003-02-28 Metso Paper Inc Puhalluslaite paperikoneessa tai vastaavassa

Also Published As

Publication number Publication date
FI20116291A (fi) 2013-06-21
CN103174050A (zh) 2013-06-26
CA2799114C (en) 2015-08-11
EP2607548A1 (en) 2013-06-26
CA2799114A1 (en) 2013-06-20
CN103174050B (zh) 2015-08-05

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