EP3717694B1 - Method and device for treating a fibrous material web in a long nip pressing unit - Google Patents

Method and device for treating a fibrous material web in a long nip pressing unit Download PDF

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Publication number
EP3717694B1
EP3717694B1 EP19707727.4A EP19707727A EP3717694B1 EP 3717694 B1 EP3717694 B1 EP 3717694B1 EP 19707727 A EP19707727 A EP 19707727A EP 3717694 B1 EP3717694 B1 EP 3717694B1
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EP
European Patent Office
Prior art keywords
press
transfer
transfer area
roll
area
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.)
Active
Application number
EP19707727.4A
Other languages
German (de)
French (fr)
Other versions
EP3717694A1 (en
Inventor
Andreas Anzel
Robert Meitner
Paul Richards
Wolfgang Plienegger
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.)
Andritz AG
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Andritz AG
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Publication date
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Priority to PL19707727T priority Critical patent/PL3717694T3/en
Publication of EP3717694A1 publication Critical patent/EP3717694A1/en
Application granted granted Critical
Publication of EP3717694B1 publication Critical patent/EP3717694B1/en
Active 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
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • 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
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F7/08—Felts
    • D21F7/12—Drying
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/24—Arrangements of devices using drying processes not involving heating

Definitions

  • the invention relates to a method for treating a fibrous web in a paper or tissue machine with a long-nip press unit.
  • This long-nip press unit consists of a shoe press roll with a rotating press cover and a counter roll, the fibrous web is dewatered in the extended press nip between the counter roll and the press cover and the fibrous web after the extended press nip on the rotating press cover of the press roll to a transfer covering, which the Fiber web takes over, is guided.
  • the invention also relates to a press arrangement with which the method according to the invention is carried out.
  • the mechanical dewatering can be considerably improved by this upstream pressing step, which is preferably carried out with a long-nip press unit, in particular a shoe press.
  • the effort for thermal drying is reduced, which leads to energy savings.
  • the fibrous web in the press nip of the upstream press step is transferred to an impermeable belt that also runs through the press nip and subsequently guided on this belt to a subsequent drying cylinder (Yankee cylinder).
  • the WO 2016/186 562 A1 discloses a method with the following web routing: transferring the fibrous web to a belt in the press nip of the upstream press step, guiding the fibrous web and the belt to a structured, permeable covering, transferring the fibrous web in a 5 mm - 40 mm long transfer nip in the machine direction between a first transfer roller and a second transfer roller (suction roller) from the belt to the structured, permeable covering, guiding the fibrous web of the structured, permeable covering to a drying cylinder.
  • the one in the EP 1 075 567 B1 as well as in the EP 0 854 229 B1 The methods described each disclose a closed web guide of the fibrous web between sheet formation and drying cylinder (Yankee cylinder).
  • the fibrous web is dewatered in an upstream press nip, the fibrous web being guided by the smooth roller unsupported via a free pull from the smooth roller to an embossing belt.
  • the fibrous web is used for dewatering in a long-nip press unit, such as a shoe press a felt passed through an extended press nip, which is formed by a shoe press roll with a rotating press cover and by a counter roll. After the extended press nip, the felt is separated from the fibrous web as quickly as possible. The fibrous web is then either continued on a covering, which is also passed through the extended press nip, on the jacket of the shoe press roll of the long-nip press unit, or on the counter roll.
  • a long-nip press unit such as a shoe press a felt passed through an extended press nip, which is formed by a shoe press roll with a rotating press cover and by a counter roll.
  • the AT 508 331 B1 discloses, for example, a method in which the fibrous web is dewatered in an extended press nip formed by a shoe press roll and a counter roll and is guided on the rotating press cover of the shoe press roll from the extended press nip to a transfer area in which the fibrous web is transferred from the press cover to a roll or to a transfer covering is passed.
  • the transfer covering wraps around the press cover or the transfer is supported by a suction roll.
  • the disclosed options for removing the fibrous web from a clothing guided through the press nip or from a roller include unsupported removal via a free pull, supported removal via another roller, or supported removal with the aid of a further clothing and a vacuum roller.
  • An unsupported (open) transfer of a fibrous web with a low sheet weight i.e. an oven-dry (oven-dry) sheet weight in the long-nip press unit of less than 50 g / m 2 , usually less than 35 g / m 2 and usually less than 25 g / m 2 , is very problematic because of the low wet strength of the fibrous web and is very prone to breaks and production losses.
  • a fibrous web with a low sheet weight is therefore a supported one (closed) transfer obvious.
  • supported, closed transfers are designed as a press nip between two rollers - one of which can also be vacuumed.
  • the nip length between two rolls is ( WO 2016/186 562 A1 ) in a range greater than / equal to 5 mm - 40 mm.
  • relevant forces are transmitted via relevant effective sounds in the transfer nip (press nip).
  • possibilities are to be found to carry out the transfer in a clearly defined area, which is particularly important at higher relative speeds in the transfer area.
  • the object of the present invention is to disclose a method for the assisted, closed transfer of a fibrous web in a long-nip press unit, in which the fibrous web is transferred from a press jacket in a clearly defined area to a further covering and thus an optimal transfer of the fibrous web without Injuries to the web is enabled.
  • a construction of a press and transfer arrangement for a paper or tissue machine is to be disclosed, which has a compact construction.
  • the fibrous web is guided to a transfer area after the extended press nip on the rotating press cover of the press roll.
  • the rotating press jacket not only fulfills its function as a press element, but also serves as a means for Further transport of the fibrous web after mechanical dewatering.
  • the fibrous web adheres to the flexible press cover after pressing.
  • the fibrous web is transferred from the press cover to a transfer covering in the transfer area. According to the invention, this is done with the aid of a stationary transfer device.
  • a stationary transfer device is understood to mean a non-rotating transfer device.
  • the transfer covering thus picks up the fibrous web in the transfer area, the rear side of the transfer covering being guided over and supported by a stationary transfer device.
  • the fixed transfer device In contrast to the prior art, in which the transfer to the transfer covering is supported by a rotating suction roll, the fixed transfer device enables a very short and precisely defined transfer area to be realized. So far, it has been assumed that for a reliable transfer of the fibrous web to the transfer covering, the transfer area, that is to say the transfer area, must be designed to be as long as possible. However, the inventors have recognized that the shortest possible transfer area can bring considerable advantages. The inventors have also recognized that for a reliable transfer, the transfer area must be precisely defined; this can hardly be achieved by rotating rollers.
  • Reliable rail handover is thus ensured by handover in a clearly defined area.
  • An extended transfer area for example by wrapping the press jacket around the press jacket before or afterwards, should be avoided.
  • the area of the transfer of the fibrous web - ie the Contact length between the press jacket and the transfer cover - take place in a clearly defined area.
  • Permeable machine coverings which can be structured or unstructured, e.g. screens commonly used in paper production, preferably structured dryer fabric coverings, as are customary in TAD (through air drying) applications, can be used as transfer coverings.
  • suction is applied to the transfer device.
  • the stationary transfer device can be designed, for example, as a slot suction device.
  • the running surface of such transfer devices is made of a low-wear and low-friction material - such as ceramic.
  • the running surface of the stationary transfer device guides the transfer clothing to the transfer zone (transfer area), with preferably no lubrication taking place, since this would lead to the transfer clothing being moistened immediately in front of the transfer zone.
  • Permeable transfer coverings offer the advantage that the fibrous web transfer from the press jacket to the transfer covering is supported by the suction of the stationary transfer device and thus by the suction of the fibrous web through the transfer covering.
  • the press cover of the shoe press roll does not form a rigid surface, such as the surface of a roll, it is advantageous to take measures to stabilize the rotating press cover. It is therefore advantageous to place the press cover of the shoe press roll under pneumatic overpressure, the pneumatic overpressure generally being less than 250 mbar, typically ⁇ 100 mbar. This stabilization ensures that the press jacket runs smoothly. This also has a positive effect on the Service life of the press jacket and the concentricity properties of the press jacket.
  • the fibrous web is preferably guided through the extended press nip on a felt.
  • the felt absorbs moisture from the fibrous web in the extended press nip. To avoid re-moistening of the fibrous web, it makes sense if the felt is separated from the fibrous web immediately after the extended press nip.
  • the press jacket is supported by support elements before and after the transfer area on the inside of the press jacket. In this way, the press jacket is additionally stabilized in the transfer area. Bars, for example, can be used as support elements.
  • the contact surface of a support element that is in contact with the inside of the press jacket typically has a curvature that corresponds to the curvature of the jacket surface or also a correspondingly smaller curvature. A hydrostatic and / or hydrodynamic lubrication of the contact surface of the support element to reduce the friction between the press jacket and support element is advantageous.
  • the support elements press between 0 mm and 20 mm radially outward from the press shell of the press roll.
  • the radial pressing out of the support elements against the press cover of the shoe roll improves the stabilization of the circumferential press cover in the area of the transfer zone, which enables an improved transfer of the fibrous web from the press cover to the transfer covering.
  • a radial pushing out of 0 mm means that the support elements are just touching the press jacket, which is under air pressure, and there is no free gap between the support element and press jacket.
  • a radial pushing out of 20 mm radially outwards in this sense means that, starting from a straight contact with the press cover (0 mm position), the support element is moved 20 mm radially outward, the center of the shoe roll forming the reference point.
  • the angle ⁇ between the support element located in front of the transfer area and the transfer area, viewed from the press roll axis, is less than 15 ° and the angle ⁇ between the support element located after the transfer area and the transfer area is less than 30 °.
  • the imaginary line of contact between the support element and the press jacket or, alternatively, the symmetry line of the support element is used for the support elements.
  • the imaginary line of contact between the stationary transfer device and the press cover is used for the transfer area. The press jacket is not supported in the area between the support elements.
  • the upright transfer device and the transfer covering running over it dips radially into the press jacket of the press roll in the transfer area between 0 and 20 mm.
  • Radial immersion of 0 mm means that the upright transfer device and the transfer cover running over it touch the press cover, which is under air pressure, and there is no free gap between the transfer cover and press cover.
  • Radial immersion of 20 mm radially inwards means in this sense that, starting from just touching the press cover (0 mm position), the transfer device is moved 20 mm radially inwards, with the center of the shoe roll (axis of rotation) forming the reference point.
  • the transfer device is immersed in the one under pneumatic pressure Press cover of the shoe roll free, which means that no mechanical support, such as a stop, a shoe or a counter-pressing element, etc., is provided in the transfer area on the side of the press cover opposite the transfer device.
  • no mechanical support such as a stop, a shoe or a counter-pressing element, etc.
  • the radial depth of immersion of the stationary transfer device in the press shell of the press roll is set by a device outside the press roll.
  • the stationary transfer device can be attached to the frame on a rotatable lever arm, with radial immersion in the press shell of the shoe roll being possible, depending on the pivot point of the lever arm - with the choice of the center point of the shoe roll as a reference.
  • the transfer of the fibrous web from the press cover of the shoe roll to the transfer covering takes place within a transfer area of less than 10 mm, preferably within less than 5 mm, ideally along a line.
  • the contact length between the press jacket and the transfer cover is therefore very short compared to the prior art.
  • the length of the transfer area can be assessed using an imprint with a pressure-sensitive film, for example with a Fujifilm (Ultra Extreme Low Pressure 5 LW).
  • the pressure-sensitive film is inserted in the transfer area with the press and transfer arrangement standing. Then the stationary transfer device together with the transfer cover is brought into the operating position against the press jacket, which is under pneumatic pressure.
  • the pressure-sensitive film changes color according to the touch of the components - standing transfer device, transfer cover, Fujifilm and press cover - whereby a coloration indicates contact or the coloration indicates the transfer area represents.
  • the forces present in the transfer area are typically ⁇ 4 kN / m, preferably ⁇ 2 kN / m and ideally ⁇ 1 kN / m.
  • the transfer covering already runs onto the stationary transfer device before the fibrous web is taken over from the press cover of the press roll and is guided through it. This ensures that the transfer covering does not wrap around the press cover of the shoe roll in front of the transfer area. This also ensures that the transfer covering only comes into contact with the fibrous web in the transfer area.
  • the stationary transfer device is designed as a slot suction device, whereby the suction of the transfer covering takes place through the slot between a first and a second suction slot edge, and the slot suction device has a curved area in front of the first inlet-side suction slot edge and the arc length of the curved area up to first suction slot edge is, for example, less than 30 mm, preferably less than 15 mm.
  • the contact of the stationary transfer device with the transfer covering, the fibrous web and the press cover is in particular in the curved area in front of the first inlet-side suction slot edge, so that the transfer area is also in the curved area in front of the first inlet-side suction slot edge.
  • This embodiment allows in particular the clear definition of the transfer area, the transfer area being shorter than 10 mm, preferably shorter than 5 mm, ideally a line.
  • the transfer cover does not touch the press cover until it is in the transfer area, the transfer cover not wrapping the press cover before or afterwards.
  • the angle ⁇ is between that guided over the stationary transfer device into the transfer area Transfer covering and the tangent to the press cover in the transfer area greater than zero degrees, which means that the transfer covering, fibrous web and press cover only come into contact in the transfer area.
  • the angle ⁇ between the transfer cover leading out of the transfer area and the tangent to the press cover in the transfer area is greater than zero degrees, so that the transfer cover does not wrap around the press cover after the transfer area and the transfer cover, fibrous web and press cover only come into contact in the transfer area.
  • the transfer covering moves in the transfer area at a lower relative speed than the press cover; the fibrous web is creped when it is transferred from the press cover to the transfer covering.
  • the fibrous web, together with the transfer covering is guided via a (further) suction device after the transfer from the press cover of the press roll to the transfer covering for further fixation of the fibrous web on the transfer covering.
  • This suction device can be designed, for example, as a suction box or "molding box”. In this fixing step, the structure of the transfer covering is also impressed on the fibrous web.
  • the conditioning of the transfer covering is of particular importance.
  • the transfer covering takes over the fibrous web in the transfer area and then transfers the fibrous web to a drying unit, for example one Drying cylinder or is passed over a TAD (through air drying) drum.
  • a drying unit for example one Drying cylinder or is passed over a TAD (through air drying) drum.
  • the transfer clothing should be conditioned.
  • Vacuum boxes or air knives can be used for the subsequent dewatering of the transfer covering. It is conceivable that a hot fluid, e.g. hot air, hot exhaust air from a drying unit, steam etc. flows through the transfer covering for further dewatering. In order to avoid renewed moistening of the transfer clothing in front of the transfer area after the transfer clothing has been drained, it is possible to dispense with doctor lubrication of the doctored guide rollers for guiding the transfer clothing.
  • an interface control mixture e.g. a release chemical
  • Applying an interface control mixture, e.g. a release chemical, to the surface of the transfer fabric before it passes through the transfer area can be beneficial to the process.
  • the application can take place, for example, through a spray bar which sprays the interface regulation mixture onto the transfer fabric. With this process step, the strength of the surface adhesion of the fibrous web on the transfer fabric can be regulated well.
  • FIG. 1 shows a tissue machine 2 with the press arrangement according to the invention.
  • the pulp suspension is fed to the forming unit via a headbox 22; it emerges from the headbox 22 between a breast roll 24 and a forming roll 23.
  • the breast roll 24 is wrapped in an outer covering 25.
  • the fiber suspension is dewatered to such an extent that a fiber web 1 is formed on the covering 26.
  • the covering 26 is preferably a felt which conveys the fibrous web 1 to a shoe press roll (press roll) 4.
  • the press arrangement according to the invention consists of a long-nip press unit 3, which has a press roller 4 with a rotating press jacket 5 and a counter roller 6. An extended press nip 7 is formed between the press roll 4 and the counter roll 6.
  • the press arrangement according to the invention now works in the following way:
  • the fibrous web 1 is guided on the felt 26 through the extended press nip 7.
  • the felt 26 absorbs moisture from the fibrous web 1.
  • the felt 26 is separated from the fibrous web 1 immediately after the extended press nip 7, so that rewetting of the fibrous web is avoided.
  • the fibrous web 1 After the extended press nip 7, the fibrous web 1 no longer runs on the felt 26 but on the press jacket 5 of the press roll 4.
  • the press jacket 5 transfers the fibrous web 1 to a transfer covering 9 in a transfer area 8.
  • the transfer of fibrous web to the transfer covering 9 is supported by the transfer device 10 with suction.
  • the transfer covering 9 is structured and permeable in the present example.
  • a further web treatment step of the fibrous web 1, namely creping, takes place in the transfer area 8.
  • the surface of the transfer covering 9 moves somewhat more slowly (lower relative speed) through the transfer area 8 than the press cover 5, so the fibrous web 1 is somewhat compressed or creped when it is transferred to the transfer covering 9.
  • thermal drying takes place on a Yankee cylinder 27, from which the dry fibrous web 1 is scraped off with the aid of a scraper, for example.
  • the conditioning of the transfer covering 9 should take place in such a way that there is no or only a very slight moistening of the transfer covering 9 as a result of the conditioning process. Therefore, the conditioning can be done, for example, with compressed air or a compressed air sword be performed. In the case of conditioning with water, it must be ensured that the transfer covering 9 is dried or sucked dry before it takes over the fibrous web 1 again.
  • the fibrous web 1 is fixed on the transfer covering 9 after the transfer of the fibrous web 1 from the press jacket 5 to the transfer covering 9.
  • the fixation can take place by guiding the fibrous web 1 lying on the transfer covering 9 over a vacuum box 14, the vacuum acting on the vacuum box 14 sucking the fibrous web 1 onto the transfer covering 9.
  • Figure 2 shows a detailed view of the transfer area of the fibrous web 1 to the transfer covering 9.
  • the fibrous web 1 lying on the press jacket 5 is transferred to the transfer covering 9 in the transfer area 8.
  • This transfer is supported by the evacuated transfer device 10. It can be seen that the press jacket 5 is not supported in the transfer area 8. This means that no support elements are provided in the transfer area 8 on the side 15 of the press jacket 5 opposite the fibrous web 1.
  • a first support element 12 for the press cover 5 is provided in the press roll 4 in front of the transfer area 8.
  • the angle ⁇ viewed from the press roll axis (press roll center) 19 between the support element 12 located in front of the transfer area 8 and the transfer area 8 is here less than 15 °, for example 6 °.
  • a second support element 13 is provided in the press roll 4, on which the press cover 5 is supported.
  • the angle ⁇ between the support element 13 and the transfer area 8 is less than 30 ° here.
  • the angle ⁇ between the transfer cover 9 guided over the stationary transfer device 10 into the transfer area 8 and the tangent 20 to the press cover 5 in the transfer area 8 greater than zero degrees, as a result of which the transfer covering 9, fibrous web 1 and press cover 5 only come into contact in the transfer area 8.
  • the angle ⁇ between the transfer cover 9 guided out of the transfer area 8 and the tangent 21 to the press cover 5 in the transfer area 8 is greater than zero degrees, so that the transfer cover 9 does not wrap around the press cover 5 after the transfer area 8 and the transfer cover 9 makes contact with the fibrous web 1 and press jacket 5 is only given in the transfer area 8.
  • the radial depth of immersion of the stationary transfer device 10 in the press jacket 5 of the press roll 4 is set by the setting device 11 outside the press roll 4.
  • the stationary transfer device 10 can be attached to the frame on a rotatable lever arm 29, with radial immersion in the press jacket 5 being possible according to the pivot point 30 of the lever arm - with the selection of the center 19 of the press roller 4 as a reference.
  • the adjusting device 11 has an adjusting screw 28 by means of which the immersion depth of the transfer device 10 can be adjusted.
  • the transfer area 8 is off Figure 2 shown in detail.
  • the transfer device 10 is designed as a slot suction device.
  • the suction slit 16 is used to suction the transfer covering 9 between a first 17 and a second suction slit edge 31.
  • the slotted suction device 10 has a curved region 18 in front of the first suction slit edge 17 on the inlet side.
  • the arc length of the curved region 18 up to the first suction slot edge 17 is, for example, smaller 30 mm, preferably less than 15 mm.
  • the contact of the stationary transfer device 10 with the transfer covering 9, the fibrous web 1 and the press cover 5 is here in the curved area 18 in front of the first inlet-side suction slot edge 17, whereby the transfer area 8 is also in the curved area 18 in front of the first inlet-side suction slot edge 17.
  • the suction slot 16 of the transfer device 10 is already outside the transfer area 8, that is, in the area of the suction slot 16, the press jacket 5 is no longer touched by the transfer covering 9.
  • the transfer covering 9 then runs over the run-out area 32 of the transfer device 10.
  • the transfer device 10 is shown.
  • the suction slot 16 is 15 mm wide here.
  • the transfer covering 9 preferably runs onto the transfer device 10 in the curved area 18 in front of the first suction slot edge 17.
  • the curved area 18 is 12 mm long here.
  • FIG Figure 5 shows a further possible embodiment of the transfer device 10.
  • the outlet area 32 of the transfer device is in contrast to FIG Figure 4 running downhill.
  • FIG. 6 shows a Fujifilm imprint 33 (Ultra Extreme Low Pressure 5 LW) of the transfer area 8 of a transfer arrangement designed according to the invention.
  • the transfer device 10 standing and swiveled away, the pressure-sensitive Fujifilm is inserted into the gap between the press jacket 5, which is under pneumatic pressure, and the transfer covering 9. Then the stationary transfer device 10 together with the transfer covering 9 is pivoted in the operating position against the press jacket 5, which is under pneumatic pressure.
  • transfer cover 9, Fujifilm and press cover 5 - the pressure-sensitive film changes color, a discoloration indicating a contact or the discoloration representing the transfer area 8.
  • the shown Fujifilm imprint 33 shows a transfer area 8 with a length of less than 5 mm in the running direction of the fibrous web 1, within which the fibrous web 1 is transferred from the press cover 5 of the press roll 4 to the transfer covering 9.
  • the length of the contact between the transfer covering 1 and the press jacket 5 normal to the running direction (transverse to the machine running direction) of the fibrous web 1 is 900 mm in this case, corresponding to the width of the transfer covering of 900 mm in this case.
  • FIG 7 shows a detail of the Fujifilm imprint 33 (Ultra Extreme Low Pressure 5 LW) of the in Figure 6 holistically represented impression.
  • a scale is shown for better quantification.
  • the scale points in the running direction of the fibrous web 1, the scale unit being [cm]. Since the discoloration represents the transfer area 8, it can be clearly seen that in the shown section of the Fujifilm imprint 33 there is a transfer area 8 with a length of less than 5 mm in the running direction of the fibrous web 1.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Behandlung einer Faserstoffbahn in einer Papier- oder Tissuemaschine mit einer Langnip-Presseinheit. Diese Langnip-Presseinheit besteht aus einer Schuhpresswalze mit einem rotierenden Pressmantel und einer Gegenwalze, wobei die Faserstoffbahn im verlängerten Pressspalt zwischen der Gegenwalze und dem Pressmantel entwässert wird und wobei die Faserstoffbahn nach dem verlängerten Pressspalt auf dem rotierenden Pressmantel der Presswalze zu einer Transferbespannung, die die Faserstoffbahn übernimmt, geführt wird. Die Erfindung betrifft auch eine Pressanordnung mit der das erfindungsgemäße Verfahren durchgeführt wird.The invention relates to a method for treating a fibrous web in a paper or tissue machine with a long-nip press unit. This long-nip press unit consists of a shoe press roll with a rotating press cover and a counter roll, the fibrous web is dewatered in the extended press nip between the counter roll and the press cover and the fibrous web after the extended press nip on the rotating press cover of the press roll to a transfer covering, which the Fiber web takes over, is guided. The invention also relates to a press arrangement with which the method according to the invention is carried out.

In konventionellen Verfahren zur Papier- und Tissueherstellung erfolgt die mechanische Entwässerung einer Faserstoffbahn vor der thermischen Trocknung durch eine direkte Anpressung der Faserstoffbahn gegen einen Trockenzylinder (Yankee-Zylinder). Ein derartiges Herstellungsverfahren ist in der DE 102 33 920 A1 beschrieben. Bei diesen Papier- bzw. Tissuemaschinen ist jedoch die mechanische Pressung bzw. die erzielbare Linienlast limitiert, da gegen den Yankee-Trockenzylinder gepresst wird. Durch einen vorgelagerten Pressenschritt, wie er beispielsweise in der EP 1 075 567 B1 beschrieben wird, erfolgt die mechanische Entwässerung in einer vom Yankee-Zylinder unabhängigen Presseinheit. Hier können optimale Pressbedingungen eingestellt werden, da man nicht mehr gegen den Trockenzylinder presst und somit nicht durch die Belastungsgrenzen des Trockenzylinders limitiert wird. Die mechanische Entwässerung kann durch diesen vorgelagerten Pressschritt, der vorzugsweise mit einer Langnip-Presseinheit, insbesondere einer Schuhpresse, durchgeführt wird, erheblich verbessert werden. Der Aufwand für die thermische Trocknung wird reduziert, was zu Energieeinsparungen führt. Hinsichtlich der Bahnführung wird beispielsweise in der EP 1 075 567 B1 die Faserstoffbahn im Pressnip des vorgelagerten Pressenschritts an einen ebenso durch den Pressnip laufenden impermeablen Belt übergeben und in weiterer Folge auf diesem Belt bis zu einem nachfolgenden Trockenzylinder (Yankee-Zylinder) geführt. Die WO 2016/186 562 A1 offenbart ein Verfahren mit folgender Bahnführung: Übergabe der Faserstoffbahn auf einen Belt im Pressnip des vorgelagerten Pressenschritts, Führung der Faserstoffbahn und des Belts zu einer strukturierten, permeablen Bespannung, Transfer der Faserstoffbahn in einem in Maschinenrichtung 5 mm - 40 mm langen Transfernip zwischen einer ersten Transferwalze und einer zweiten Transferwalze (Saugwalze) von dem Belt auf die strukturierte, permeable Bespannung, Führung der Faserstoffbahn der strukturierten, permeablen Bespannung zu einem Trockenzylinder.In conventional processes for paper and tissue production, the mechanical dewatering of a fibrous web takes place prior to thermal drying by pressing the fibrous web directly against a drying cylinder (Yankee cylinder). Such a manufacturing method is in DE 102 33 920 A1 described. In these paper or tissue machines, however, the mechanical pressure or the achievable line load is limited because the pressure is applied against the Yankee drying cylinder. By means of an upstream press step, as it is, for example, in the EP 1 075 567 B1 is described, the mechanical dewatering takes place in a press unit independent of the Yankee cylinder. Optimum press conditions can be set here, since you no longer press against the drying cylinder and are therefore not limited by the load limits of the drying cylinder. The mechanical dewatering can be considerably improved by this upstream pressing step, which is preferably carried out with a long-nip press unit, in particular a shoe press. The effort for thermal drying is reduced, which leads to energy savings. With regard to the path guidance, for example, in the EP 1 075 567 B1 the fibrous web in the press nip of the upstream press step is transferred to an impermeable belt that also runs through the press nip and subsequently guided on this belt to a subsequent drying cylinder (Yankee cylinder). The WO 2016/186 562 A1 discloses a method with the following web routing: transferring the fibrous web to a belt in the press nip of the upstream press step, guiding the fibrous web and the belt to a structured, permeable covering, transferring the fibrous web in a 5 mm - 40 mm long transfer nip in the machine direction between a first transfer roller and a second transfer roller (suction roller) from the belt to the structured, permeable covering, guiding the fibrous web of the structured, permeable covering to a drying cylinder.

Aus der EP 0 854 229 B1 ist hingegen bekannt, dass nach Bildung der Faserstoffbahn auf einem Oberfilz, in der vorgelagerten Presse eine erste Entwässerung zwischen dem Oberfilz und einem Unterfilz erfolgt und schließlich die Faserstoffbahn in einer durch eine Anpresswalze und einen Trockenzylinder gebildeten Hauptpresse vom Oberfilz an einen Trockenzylinder übergeben wird.From the EP 0 854 229 B1 however, it is known that after the formation of the fibrous web on an upper felt, a first dewatering between the upper felt and a lower felt takes place in the upstream press and finally the fibrous web is transferred from the upper felt to a drying cylinder in a main press formed by a pressure roller and a drying cylinder.

Die in der EP 1 075 567 B1 als auch in der EP 0 854 229 B1 beschriebenen Verfahren offenbaren jeweils eine geschlossene Bahnführung der Faserstoffbahn zwischen Blattbildung und Trockenzylinder (Yankee-Zylinder). In der EP 1 314 817 B1 wird hingegen die Faserstoffbahn in einem vorgelagerten Pressnip entwässert, wobei die Faserstoffbahn von der glatten Walze ungestützt über einen freien Zug von der glatten Walze zu einem Prägeband geführt wird.The one in the EP 1 075 567 B1 as well as in the EP 0 854 229 B1 The methods described each disclose a closed web guide of the fibrous web between sheet formation and drying cylinder (Yankee cylinder). In the EP 1 314 817 B1 on the other hand, the fibrous web is dewatered in an upstream press nip, the fibrous web being guided by the smooth roller unsupported via a free pull from the smooth roller to an embossing belt.

Zur Entwässerung in einer Langnip-Presseinheit, wie beispielsweise einer Schuhpresse, wird die Faserstoffbahn auf einem Filz durch einen verlängerten Pressspalt geführt, der durch eine Schuhpresswalze mit einem rotierenden Pressmantel und durch eine Gegenwalze gebildet wird. Nach dem verlängerten Pressspalt wird der Filz möglichst schnell von der Faserstoffbahn getrennt. Die Faserstoffbahn wird dann entweder auf einer Bespannung, die ebenfalls durch den verlängerten Pressspalt geführt wird, auf dem Mantel der Schuhpresswalze der Langnip-Presseneinheit oder auf der Gegenwalze weitergeführt.The fibrous web is used for dewatering in a long-nip press unit, such as a shoe press a felt passed through an extended press nip, which is formed by a shoe press roll with a rotating press cover and by a counter roll. After the extended press nip, the felt is separated from the fibrous web as quickly as possible. The fibrous web is then either continued on a covering, which is also passed through the extended press nip, on the jacket of the shoe press roll of the long-nip press unit, or on the counter roll.

Die AT 508 331 B1 offenbart beispielsweise ein Verfahren in dem die Faserstoffbahn in einem von einer Schuhpresswalze und einer Gegenwalze gebildeten verlängerten Pressenspalt entwässert wird und auf dem rotierenden Pressmantel der Schuhpresswalze vom verlängerten Pressenspalt zu einem Transferbereich geführt wird, in dem die Faserstoffbahn vom Pressmantel auf eine Walze oder auf eine Transferbespannung übergeben wird. Die Transferbespannung umschlingt dabei den Pressmantel bzw. wird der Transfer durch eine Saugwalze unterstützt.The AT 508 331 B1 discloses, for example, a method in which the fibrous web is dewatered in an extended press nip formed by a shoe press roll and a counter roll and is guided on the rotating press cover of the shoe press roll from the extended press nip to a transfer area in which the fibrous web is transferred from the press cover to a roll or to a transfer covering is passed. The transfer covering wraps around the press cover or the transfer is supported by a suction roll.

Die offenbarten Abnahmemöglichkeiten der Faserstoffbahn von einer durch den Pressspalt geführten Bespannung oder von einer Walze umfassen die ungestützte Abnahme über einen freien Zug, die gestützte Abnahme über eine weitere Walze, oder die gestützte Abnahme unter Zuhilfenahme einer weiteren Bespannung und einer besaugten Walze.The disclosed options for removing the fibrous web from a clothing guided through the press nip or from a roller include unsupported removal via a free pull, supported removal via another roller, or supported removal with the aid of a further clothing and a vacuum roller.

Ein ungestützter (offener) Transfer einer Faserstoffbahn mit einem niedrigen Blattgewicht, d.h. einem otro (ofentrocken) Blattgewicht in der Langnip-Presseinheit von niedriger als 50 g/m2, meist niedriger als 35 g/m2 und im Regelfall niedriger als 25 g/m2, ist wegen der geringen Nassfestigkeit der Faserstoffbahn sehr problematisch und sehr anfällig für Abrisse und Produktionsausfälle. Für eine Faserstoffbahn mit einem niedrigen Blattgewicht ist daher ein gestützter (geschlossener) Transfer naheliegend. Gestützte, geschlossene Transfers sind im Stand der Technik als Pressnip zwischen zwei Walzen - von der eine auch besaugt sein kann - ausgeführt. Dabei werden typischerweise im Transfernip Kräfte von 4 kN/m bis 15 kN/m - bevorzugt 4 kN/m bis 8 kN/m - übertragen. Die Niplänge zwischen zwei Walzen liegt gemäß Stand der Technik ( WO 2016/186 562 A1 ) in einem Bereich größer/gleich 5 mm - 40 mm. Somit werden im Stand der Technik im Transfernip (Pressnip) relevante Kräfte über relevante Wirklängen übertragen. Um den Transfer der Faserstoffbahn weiter zu verbessern und das Risiko einer Verletzung der Bahn weiter zu minimieren, sollen Möglichkeiten gefunden werden, den Transfer in einem klar definierten Bereich durchzuführen, was insbesondere bei höheren Relativgeschwindigkeiten im Transferbereich wichtig ist.An unsupported (open) transfer of a fibrous web with a low sheet weight, i.e. an oven-dry (oven-dry) sheet weight in the long-nip press unit of less than 50 g / m 2 , usually less than 35 g / m 2 and usually less than 25 g / m 2 , is very problematic because of the low wet strength of the fibrous web and is very prone to breaks and production losses. For a fibrous web with a low sheet weight is therefore a supported one (closed) transfer obvious. In the prior art, supported, closed transfers are designed as a press nip between two rollers - one of which can also be vacuumed. Forces of 4 kN / m to 15 kN / m - preferably 4 kN / m to 8 kN / m - are typically transferred in the transfer nip. According to the state of the art, the nip length between two rolls is ( WO 2016/186 562 A1 ) in a range greater than / equal to 5 mm - 40 mm. Thus, in the prior art, relevant forces are transmitted via relevant effective sounds in the transfer nip (press nip). In order to further improve the transfer of the fibrous web and further minimize the risk of damaging the web, possibilities are to be found to carry out the transfer in a clearly defined area, which is particularly important at higher relative speeds in the transfer area.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zum gestützten, geschlossenen Transfer einer Faserstoffbahn in einer Langnip-Presseinheit zu offenbaren, bei dem die Faserstoffbahn von einem Pressmantel in einem klar definierten Bereich an eine weitere Bespannung übergeben wird und so eine optimale Übergabe der Faserstoffbahn ohne Verletzungen der Bahn ermöglicht wird. Außerdem soll ein Aufbau einer Pressen- und Transferanordnung für eine Papier- oder Tissuemaschine offenbart werden, die einen kompakten Aufbau aufweist.The object of the present invention is to disclose a method for the assisted, closed transfer of a fibrous web in a long-nip press unit, in which the fibrous web is transferred from a press jacket in a clearly defined area to a further covering and thus an optimal transfer of the fibrous web without Injuries to the web is enabled. In addition, a construction of a press and transfer arrangement for a paper or tissue machine is to be disclosed, which has a compact construction.

Gelöst wird diese Aufgabe mit einem Verfahren gemäß Patentanspruch 1 und einer Vorrichtung gemäß Patentanspruch 12.This object is achieved with a method according to claim 1 and a device according to claim 12.

Im erfindungsgemäßen Verfahren wird die Faserstoffbahn nach dem verlängerten Pressspalt auf dem rotierenden Pressmantel der Presswalze zu einem Transferbereich geführt. Der rotierende Pressmantel erfüllt also nicht nur seine Funktion als Presselement, sondern dient gleichzeitig als Mittel zum Weitertransport der Faserstoffbahn nach der mechanischen Entwässerung. Die Faserstoffbahn haftet nach der Pressung am flexiblen Pressmantel. Die Faserstoffbahn wird im Transferbereich vom Pressmantel auf eine Transferbespannung übergeben. Dies erfolgt erfindungsgemäß mit Hilfe einer feststehenden Transfervorrichtung. Im Sinne der Erfindung wird unter einer feststehenden Transfervorrichtung eine nicht rotierende Transfervorrichtung verstanden.In the method according to the invention, the fibrous web is guided to a transfer area after the extended press nip on the rotating press cover of the press roll. The rotating press jacket not only fulfills its function as a press element, but also serves as a means for Further transport of the fibrous web after mechanical dewatering. The fibrous web adheres to the flexible press cover after pressing. The fibrous web is transferred from the press cover to a transfer covering in the transfer area. According to the invention, this is done with the aid of a stationary transfer device. In the context of the invention, a stationary transfer device is understood to mean a non-rotating transfer device.

Die Transferbespannung nimmt also im Transferbereich die Faserstoffbahn auf, wobei dabei die Rückseite der Transferbespannung über eine stehende Transfervorrichtung geführt und durch diese gestützt wird.The transfer covering thus picks up the fibrous web in the transfer area, the rear side of the transfer covering being guided over and supported by a stationary transfer device.

Im Gegensatz zum Stand der Technik, bei dem der Transfer auf die Transferbespannung durch eine rotierende Saugwalze unterstützt wird, kann durch die feststehende Transfervorrichtung ein sehr kurzer und genau definierter Übergabebereich realisiert werden. Bisher ist man davon ausgegangen, dass für eine zuverlässige Übergabe der Faserstoffbahn auf die Transferbespannung der Transferbereich, also der Übergabebereich, möglichst lang ausgebildet sein muss. Die Erfinder haben jedoch erkannt, dass gerade ein möglichst kurzer Übergabebereich erhebliche Vorteile bringen kann. Die Erfinder haben weiters erkannt, dass für eine zuverlässige Übergabe, der Transferbereich genau definiert sein muss, dies lässt sich durch rotieren Walzen kaum realisieren.In contrast to the prior art, in which the transfer to the transfer covering is supported by a rotating suction roll, the fixed transfer device enables a very short and precisely defined transfer area to be realized. So far, it has been assumed that for a reliable transfer of the fibrous web to the transfer covering, the transfer area, that is to say the transfer area, must be designed to be as long as possible. However, the inventors have recognized that the shortest possible transfer area can bring considerable advantages. The inventors have also recognized that for a reliable transfer, the transfer area must be precisely defined; this can hardly be achieved by rotating rollers.

Eine zuverlässige Bahnübergabe wird somit durch eine Übergabe in einem klar definierten Bereich sichergestellt. Ein verlängerter Transferbereich, etwa durch eine Vor- oder Nachumschlingung des Pressmantels durch die Transferbespannung, soll vermieden werden. Ebenso soll der Bereich der Übergabe der Faserstoffbahn - d.h. die Kontaktlänge zwischen Pressmantel und Transferbespannung - in einem klar definierten Bereich erfolgen.Reliable rail handover is thus ensured by handover in a clearly defined area. An extended transfer area, for example by wrapping the press jacket around the press jacket before or afterwards, should be avoided. Likewise, the area of the transfer of the fibrous web - ie the Contact length between the press jacket and the transfer cover - take place in a clearly defined area.

Als Transferbespannung können permeable Maschinenbespannungen verwendet werde, die strukturiert oder unstrukturiert sein können, z.B. in der Papierproduktion gebräuchliche Siebe, bevorzugt strukturierte Trockensiebbespannungen, wie sie in TAD (through air drying) Anwendungen üblich sind.Permeable machine coverings, which can be structured or unstructured, e.g. screens commonly used in paper production, preferably structured dryer fabric coverings, as are customary in TAD (through air drying) applications, can be used as transfer coverings.

In einer bevorzugten Ausführung ist die Transfervorrichtung besaugt. Die feststehende Transfervorrichtung kann beispielsweise als Schlitzsauger ausgeführt sein. Idealerweise ist die Lauffläche solcher Transfervorrichtungen aus einem verschleiß- und reibungsarmen Material - wie z.B. Keramik - gefertigt. Die Lauffläche der stehenden Transfervorrichtung führt die Transferbespannung zur Transferzone (Transferbereich), wobei bevorzugt keine Schmierung erfolgt, da dies zu einer Befeuchtung der Transferbespannung unmittelbar vor der Transferzone führen würde.In a preferred embodiment, suction is applied to the transfer device. The stationary transfer device can be designed, for example, as a slot suction device. Ideally, the running surface of such transfer devices is made of a low-wear and low-friction material - such as ceramic. The running surface of the stationary transfer device guides the transfer clothing to the transfer zone (transfer area), with preferably no lubrication taking place, since this would lead to the transfer clothing being moistened immediately in front of the transfer zone.

Permeable Transferbespannungen bieten den Vorteil, dass der Faserstoffbahntransfer vom Pressmantel auf die Transferbespannung durch die Besaugung der stehenden Transfervorrichtung und somit durch die Ansaugung der Faserstoffbahn durch die Transferbespannung hindurch, unterstützt wird.Permeable transfer coverings offer the advantage that the fibrous web transfer from the press jacket to the transfer covering is supported by the suction of the stationary transfer device and thus by the suction of the fibrous web through the transfer covering.

Da der Pressmantel der Schuhpresswalze keine starre Oberfläche bildet, wie beispielsweise die Oberfläche einer Walze, ist es vorteilhaft, Maßnahmen zur Stabilisierung des rotierenden Pressmantels zu setzen. So ist es vorteilhaft, den Pressmantel der Schuhpresswalze unter pneumatischen Überdruck zu setzen, wobei im Regelfall der pneumatische Überdruck kleiner 250 mbar, typischerweise < 100 mbar ist. Durch diese Stabilisierung kann ein gleichmäßiger Lauf des Pressmantels sichergestellt werden. Dies wirkt sich auch positiv auf die Lebensdauer des Pressmantels und auf die Rundlaufeigenschaften des Pressmantels aus.Since the press cover of the shoe press roll does not form a rigid surface, such as the surface of a roll, it is advantageous to take measures to stabilize the rotating press cover. It is therefore advantageous to place the press cover of the shoe press roll under pneumatic overpressure, the pneumatic overpressure generally being less than 250 mbar, typically <100 mbar. This stabilization ensures that the press jacket runs smoothly. This also has a positive effect on the Service life of the press jacket and the concentricity properties of the press jacket.

Vorzugsweise wird die Faserstoffbahn auf einem Filz durch den verlängerten Pressspalt geführt. Der Filz nimmt dabei im verlängerten Pressspalt die Feuchtigkeit von der Faserstoffbahn auf. Zur Vermeidung einer Rückbefeuchtung der Faserstoffbahn ist es sinnvoll, wenn der Filz unmittelbar nach dem verlängerten Pressspalt von der Faserstoffbahn getrennt wird.The fibrous web is preferably guided through the extended press nip on a felt. The felt absorbs moisture from the fibrous web in the extended press nip. To avoid re-moistening of the fibrous web, it makes sense if the felt is separated from the fibrous web immediately after the extended press nip.

In einer bevorzugten Ausführung ist der Pressmantel vor und nach dem Transferbereich auf der Innenseite des Pressmantels durch Stützelemente gestützt. So wird der Pressmantel im Transferbereich zusätzlich stabilisiert. Als Stützelemente können beispielsweise Leisten verwendet werden. Die mit der Innenseite des Pressmantels in Kontakt stehende Kontaktfläche eines Stützelements hat typischerweise eine der Krümmung der Mantelfläche entsprechende oder auch entsprechend kleinere Krümmung. Eine hydrostatische und / oder hydrodynamische Schmierung der Kontaktfläche des Stützelements zu Verminderung der Reibung zwischen Pressmantel und Stützelement ist vorteilhaft.In a preferred embodiment, the press jacket is supported by support elements before and after the transfer area on the inside of the press jacket. In this way, the press jacket is additionally stabilized in the transfer area. Bars, for example, can be used as support elements. The contact surface of a support element that is in contact with the inside of the press jacket typically has a curvature that corresponds to the curvature of the jacket surface or also a correspondingly smaller curvature. A hydrostatic and / or hydrodynamic lubrication of the contact surface of the support element to reduce the friction between the press jacket and support element is advantageous.

In einer bevorzugten Ausführung drücken die Stützelemente zwischen 0 mm und 20 mm radial nach außen aus dem Pressmantel der Presswalze. Durch das radiale Herausdrücken der Stützelemente gegen den Pressmantel der Schuhwalze wird eine verbesserte Stabilisierung des umlaufenden Pressmantels im Bereich der Transferzone erzielt, wodurch eine verbesserte Übergabe der Faserstoffbahn vom Pressmantel auf die Transferbespannung ermöglicht wird. Dabei bedeutet ein radiales Herausdrücken von 0 mm, das die Stützelemente den unter Luftdruck stehenden Pressmantel gerade berühren und kein freier Spalt zwischen Stützelement und Pressmantel gegeben ist. Ein radiales Herausdrücken von 20 mm radial nach außen bedeutet in diesem Sinn, dass ausgehend von einem gerade Berühren des Pressmantels (0 mm Position) das Stützelement 20 mm radial nach außen bewegt wird, wobei der Mittelpunkt der Schuhwalze den Referenzpunkt bildet.In a preferred embodiment, the support elements press between 0 mm and 20 mm radially outward from the press shell of the press roll. The radial pressing out of the support elements against the press cover of the shoe roll improves the stabilization of the circumferential press cover in the area of the transfer zone, which enables an improved transfer of the fibrous web from the press cover to the transfer covering. A radial pushing out of 0 mm means that the support elements are just touching the press jacket, which is under air pressure, and there is no free gap between the support element and press jacket. A radial pushing out of 20 mm radially outwards in this sense means that, starting from a straight contact with the press cover (0 mm position), the support element is moved 20 mm radially outward, the center of the shoe roll forming the reference point.

In einer bevorzugten Ausführung beträgt der Winkel α von der Presswalzenachse aus betrachtet zwischen dem vor dem Transferbereich liegenden Stützelement und dem Transferbereich weniger als 15° und der Winkel β zwischen dem nach dem Transferbereich liegenden Stützelement und dem Transferbereich weniger als 30°. Zur Winkelbestimmung wird für die Stützelemente die imaginäre Berührlinie zwischen Stützelement und Pressmantel oder alternativ die Symmetrielinie des Stützelements herangezogen. Zur Winkelbestimmung wird für den Transferbereich die imaginäre Berührlinie zwischen der stehenden Transfervorrichtung und dem Pressmantel herangezogen. Im Bereich zwischen den Stützelementen ist der Pressmantel nicht unterstützt.In a preferred embodiment, the angle α between the support element located in front of the transfer area and the transfer area, viewed from the press roll axis, is less than 15 ° and the angle β between the support element located after the transfer area and the transfer area is less than 30 °. To determine the angle, the imaginary line of contact between the support element and the press jacket or, alternatively, the symmetry line of the support element is used for the support elements. To determine the angle, the imaginary line of contact between the stationary transfer device and the press cover is used for the transfer area. The press jacket is not supported in the area between the support elements.

In einer bevorzugten Ausführungsform taucht die stehende Transfervorrichtung und die darüber laufende Transferbespannung im Transferbereich zwischen 0 und 20 mm radial in den Pressmantel der Presswalze ein. Dabei bedeutet ein radiales Eintauchen von 0 mm, das die stehende Transfervorrichtung und die darüber laufende Transferbespannung den unter Luftdruck stehenden Pressmantel berühren und kein freier Spalt zwischen Transferbespannung und Pressmantel gegeben ist. Ein radiales Eintauchen von 20 mm radial nach innen bedeutet in diesem Sinn, dass ausgehend von einem gerade Berühren des Pressmantels (0 mm Position) die Transfervorrichtung 20 mm radial nach innen bewegt wird, wobei der Mittelpunkt der Schuhwalze (Rotationsachse) den Referenzpunkt bildet.In a preferred embodiment, the upright transfer device and the transfer covering running over it dips radially into the press jacket of the press roll in the transfer area between 0 and 20 mm. Radial immersion of 0 mm means that the upright transfer device and the transfer cover running over it touch the press cover, which is under air pressure, and there is no free gap between the transfer cover and press cover. Radial immersion of 20 mm radially inwards means in this sense that, starting from just touching the press cover (0 mm position), the transfer device is moved 20 mm radially inwards, with the center of the shoe roll (axis of rotation) forming the reference point.

In einer bevorzugten Ausführung erfolgt das Eintauchen der Transfervorrichtung in den unter pneumatischem Druck stehenden Pressmantel der Schuhwalze frei, was bedeutet, dass im Transferbereich auf der der Transfervorrichtung gegenüberliegenden Seite des Pressmantels keine mechanische Unterstützung, wie z.B. ein Anschlag, ein Schuh oder ein Gegenpresselement, etc. vorgesehen ist. Dadurch lassen sich im Transferbereich die vorliegenden Kräfte deutlich niedriger als im Stand der Technik gezeigt halten.In a preferred embodiment, the transfer device is immersed in the one under pneumatic pressure Press cover of the shoe roll free, which means that no mechanical support, such as a stop, a shoe or a counter-pressing element, etc., is provided in the transfer area on the side of the press cover opposite the transfer device. As a result, the forces present in the transfer area can be kept significantly lower than shown in the prior art.

In einer bevorzugten Ausführung wird die radiale Eintauchtiefe der stehenden Transfervorrichtung in den Pressmantel der Presswalze durch eine Vorrichtung außerhalb der Presswalze eingestellt. So kann die stehende Transfervorrichtung auf einem drehbaren Hebelarm an der Stuhlung befestigt sein, wobei entsprechend dem Drehpunkt des Hebelarms ein - mit der Wahl des Mittelpunkts der Schuhwalze als Referenz - radiales Eintauchen in den Pressmantel der Schuhwalze möglich wird.In a preferred embodiment, the radial depth of immersion of the stationary transfer device in the press shell of the press roll is set by a device outside the press roll. The stationary transfer device can be attached to the frame on a rotatable lever arm, with radial immersion in the press shell of the shoe roll being possible, depending on the pivot point of the lever arm - with the choice of the center point of the shoe roll as a reference.

In einer weiteren bevorzugten Ausführungsform der Erfindung erfolgt die Übergabe der Faserstoffbahn vom Pressmantel der Schuhwalze auf die Transferbespannung innerhalb eines Transferbereichs von weniger als 10 mm, bevorzugt innerhalb von weniger als 5 mm, idealerweise entlang einer Linie. Die Kontaktlänge zwischen Pressmantel und Transferbespannung ist somit im Vergleich zum Stand der Technik sehr kurz. Die Beurteilung der Länge des Transferbereichs kann über einen Abdruck mit einem druckempfindlichen Film, z.B. mit einem Fujifilm (Ultra Extreme Low Pressure 5 L W), erfolgen. Dazu wird bei stehender Pressen- und Transferanordnung der druckempfindliche Film im Transferbereich eingelegt. Danach wird die stehende Transfervorrichtung samt Transferbespannung in Betriebsposition gegen den unter pneumatischem Druck stehenden Pressmantel gebracht. Entsprechend der Berührung der Komponenten - stehende Transfervorrichtung, Transferbespannung, Fujifilm und Pressmantel - verfärbt sich der druckempfindliche Film, wobei eine Verfärbung einen Kontakt anzeigt, bzw. die Verfärbung den Transferbereich repräsentiert. Die im Transferbereich vorliegenden Kräfte sind typischerweise < 4 kN/m, bevorzugt < 2 kN/m und idealerweise < 1 kN/m.In a further preferred embodiment of the invention, the transfer of the fibrous web from the press cover of the shoe roll to the transfer covering takes place within a transfer area of less than 10 mm, preferably within less than 5 mm, ideally along a line. The contact length between the press jacket and the transfer cover is therefore very short compared to the prior art. The length of the transfer area can be assessed using an imprint with a pressure-sensitive film, for example with a Fujifilm (Ultra Extreme Low Pressure 5 LW). For this purpose, the pressure-sensitive film is inserted in the transfer area with the press and transfer arrangement standing. Then the stationary transfer device together with the transfer cover is brought into the operating position against the press jacket, which is under pneumatic pressure. The pressure-sensitive film changes color according to the touch of the components - standing transfer device, transfer cover, Fujifilm and press cover - whereby a coloration indicates contact or the coloration indicates the transfer area represents. The forces present in the transfer area are typically <4 kN / m, preferably <2 kN / m and ideally <1 kN / m.

In einer bevorzugten Ausführung läuft die Transferbespannung bereits vor der Übernahme der Faserstoffbahn vom Pressmantel der Presswalze auf die stehende Transfervorrichtung auf und wird durch diese geführt. So ist sichergestellt, dass die Transferbespannung nicht den Pressmantel der Schuhwalze vor dem Transferbereich vorumschlingt. Dadurch ist weiters sichergestellt, dass die Transferbespannung erst im Transferbereich mit der Faserstoffbahn in Kontakt kommt.In a preferred embodiment, the transfer covering already runs onto the stationary transfer device before the fibrous web is taken over from the press cover of the press roll and is guided through it. This ensures that the transfer covering does not wrap around the press cover of the shoe roll in front of the transfer area. This also ensures that the transfer covering only comes into contact with the fibrous web in the transfer area.

In einer bevorzugten Ausführung ist die feststehende Transfervorrichtung als Schlitzsauger ausgeführt, wobei durch den Schlitz die Besaugung der Transferbespannung zwischen einer ersten und einer zweiten Saugschlitzkante erfolgt, und wobei der Schlitzsauger einen gekrümmten Bereich vor der ersten einlaufseitigen Saugschlitzkante aufweist und die Bogenlänge des gekrümmten Bereichs bis zur ersten Saugschlitzkante beispielsweise kleiner 30 mm, bevorzugt kleiner 15 mm ist. Der Kontakt der feststehenden Transvorrichtung mit der Transferbespannung, der Faserstoffbahn und dem Pressmantel liegt insbesondere im gekrümmten Bereich vor der ersten einlaufseitigen Saugschlitzkante, womit der Transferbereich ebenso im gekrümmten Bereich vor der ersten einlaufseitigen Saugschlitzkante liegt. Diese Ausführung erlaubt insbesondere die klare Definition des Transferbereichs, wobei der Transferbereich kürzer als 10 mm, bevorzugt kürzer als 5 mm, idealerweise eine Linie ist.In a preferred embodiment, the stationary transfer device is designed as a slot suction device, whereby the suction of the transfer covering takes place through the slot between a first and a second suction slot edge, and the slot suction device has a curved area in front of the first inlet-side suction slot edge and the arc length of the curved area up to first suction slot edge is, for example, less than 30 mm, preferably less than 15 mm. The contact of the stationary transfer device with the transfer covering, the fibrous web and the press cover is in particular in the curved area in front of the first inlet-side suction slot edge, so that the transfer area is also in the curved area in front of the first inlet-side suction slot edge. This embodiment allows in particular the clear definition of the transfer area, the transfer area being shorter than 10 mm, preferably shorter than 5 mm, ideally a line.

In einer bevorzugten Ausführung berührt die Transferbespannung den Pressmantel erst im Transferbereich, wobei keine Vor- oder Nachumschlingung des Pressmantels durch die Transferbespannung erfolgt. In diesem Sinne ist der Winkel γ zwischen der über die stehende Transfervorrichtung in den Transferbereich geführten Transferbespannung und der Tangente an den Pressmantel im Transferbereich größer Null Grad, wodurch erst im Transferbereich ein Kontakt von Transferbespannung, Faserstoffbahn und Pressmantel erfolgt. Ebenso ist der Winkel δ zwischen der aus dem Transferbereich geführten Transferbespannung und der Tangente an den Pressmantel im Transferbereich größer Null Grad, sodass die Transferbespannung den Pressmantel nach dem Transferbereich nicht umschlingt und ein Kontakt der Transferbespannung, Faserstoffbahn und Pressmantel nur im Transferbereich gegeben ist.In a preferred embodiment, the transfer cover does not touch the press cover until it is in the transfer area, the transfer cover not wrapping the press cover before or afterwards. In this sense, the angle γ is between that guided over the stationary transfer device into the transfer area Transfer covering and the tangent to the press cover in the transfer area greater than zero degrees, which means that the transfer covering, fibrous web and press cover only come into contact in the transfer area. Likewise, the angle δ between the transfer cover leading out of the transfer area and the tangent to the press cover in the transfer area is greater than zero degrees, so that the transfer cover does not wrap around the press cover after the transfer area and the transfer cover, fibrous web and press cover only come into contact in the transfer area.

Wenn die Übergabe der Faserstoffbahn vom Pressmantel auf die Transferbespannung mit einer Geschwindigkeitsdifferenz zwischen Pressmantel und Transferbespannung durchgeführt wird, kann gleichzeitig ein weiterer Behandlungsschritt der Faserstoffbahn realisiert werden. In einer bevorzugten Ausführung bewegt sich die Transferbespannung im Transferbereich mit einer geringeren Relativgeschwindigkeit als der Pressmantel, es kommt zu einer Kreppung der Faserstoffbahn bei der Übergabe vom Pressmantel zur Transferbespannung.If the transfer of the fibrous web from the press cover to the transfer covering is carried out with a speed difference between the press cover and the transfer covering, a further treatment step of the fibrous web can be implemented at the same time. In a preferred embodiment, the transfer covering moves in the transfer area at a lower relative speed than the press cover; the fibrous web is creped when it is transferred from the press cover to the transfer covering.

In einer bevorzugten Ausführung wird die Faserstoffbahn zusammen mit der Transferbespannung nach der Übergabe von dem Pressmantel der Presswalze auf die Transferbespannung zur weiteren Fixierung der Faserstoffbahn auf der Transferbespannung über eine (weitere) Saugvorrichtung geführt. Diese Saugvorrichtung kann beispielsweise als Saugkasten oder "Moulding Box" ausgeführt sein. In diesem Schritt der Fixierung wird auch die Struktur der Transferbespannung der Faserstoffbahn aufgeprägt.In a preferred embodiment, the fibrous web, together with the transfer covering, is guided via a (further) suction device after the transfer from the press cover of the press roll to the transfer covering for further fixation of the fibrous web on the transfer covering. This suction device can be designed, for example, as a suction box or "molding box". In this fixing step, the structure of the transfer covering is also impressed on the fibrous web.

Der Konditionierung der Transferbespannung kommt eine besondere Bedeutung zu. Die Transferbespannung übernimmt die Faserstoffbahn im Transferbereich und übergibt die Faserstoffbahn nachfolgend an eine Trockeneinheit, z.B. einen Trockenzylinder oder wird über eine TAD (through air drying) Trommel geführt.The conditioning of the transfer covering is of particular importance. The transfer covering takes over the fibrous web in the transfer area and then transfers the fibrous web to a drying unit, for example one Drying cylinder or is passed over a TAD (through air drying) drum.

Nach Abgabe der Faserstoffbahn an die nachfolgende Einheit sollte die Transferbespannung konditioniert werden.After the fibrous web has been handed over to the following unit, the transfer clothing should be conditioned.

Traditionell werden dazu "flooded nip showers" oder Hochdruckdüsen verwendet. Zur nachfolgenden Entwässerung der Transferbespannung können Vakuumboxen oder Luftmesser (Druckluftschwert) eingesetzt werden. Es ist vorstellbar, dass zur weiteren Entwässerung der Transferbespannung diese mit einem heißen Fluid, z.B. Heißluft, heiße Abluft einer Trocknungseinheit, Dampf etc. durchströmt wird. Um nach einer erfolgten Entwässerung der Transferbespannung eine erneute Befeuchtung der Transferbespannung vor dem Transferbereich zu vermeiden, kann auf eine Schaberschmierung der beschaberten Leitwalzen zur Führung der Transferbespannung verzichtet werden.Traditionally, "flooded nip showers" or high pressure nozzles are used for this. Vacuum boxes or air knives (compressed air sword) can be used for the subsequent dewatering of the transfer covering. It is conceivable that a hot fluid, e.g. hot air, hot exhaust air from a drying unit, steam etc. flows through the transfer covering for further dewatering. In order to avoid renewed moistening of the transfer clothing in front of the transfer area after the transfer clothing has been drained, it is possible to dispense with doctor lubrication of the doctored guide rollers for guiding the transfer clothing.

Die Applizierung eines Grenzflächenregulierungsgemisches, z.B. einer Release Chemikalie, auf die Oberfläche der Transferbespannung, bevor sie den Transferbereich durchläuft, kann günstig für das Verfahren sein. Die Applizierung kann beispielsweise durch einen Spritzbalken erfolgen, der das Grenzflächenregulierungsgemisch auf die Transferbespannung sprüht. Durch diesen Verfahrensschritt kann die Stärke der Oberflächenhaftung der Faserstoffbahn auf der Transferbespannung gut reguliert werden.Applying an interface control mixture, e.g. a release chemical, to the surface of the transfer fabric before it passes through the transfer area can be beneficial to the process. The application can take place, for example, through a spray bar which sprays the interface regulation mixture onto the transfer fabric. With this process step, the strength of the surface adhesion of the fibrous web on the transfer fabric can be regulated well.

Im Folgenden wird die Erfindung anhand von Zeichnungen beschrieben. Es zeigen:

  • Fig. 1 eine Tissuemaschine mit der erfindungsgemäßen Press- und Transferanordnung;
  • Fig. 2 eine Detailansicht der erfindungsgemäßen Transferanordnung;
  • Fig. 3 eine Detailansicht des Transferbereiches;
  • Fig. 4 eine Detailansicht einer erfindungsgemäßen feststehenden Transfervorrichtung über die die Transferbespannung geführt wird;
  • Fig. 5 eine weitere Ausführungsform der feststehenden Transfervorrichtung;
  • Fig. 6 eine Ansicht eines Fujifilm-Abdrucks (Ultra Extreme Low Pressure 5 L W) des Transferbereichs einer erfindungsgemäß ausgeführten Transferanordnung mit einer 900 mm breiten Transferbespannung;
  • Fig. 7 eine Detailansicht eines Fujifilm-Abdrucks (Ultra Extreme Low Pressure 5 L W) des Transferbereichs einer erfindungsgemäß ausgeführten Transferanordnung;
The invention is described below with reference to drawings. Show it:
  • Fig. 1 a tissue machine with the press and transfer arrangement according to the invention;
  • Fig. 2 a detailed view of the transfer arrangement according to the invention;
  • Fig. 3 a detailed view of the transfer area;
  • Fig. 4 a detailed view of a stationary transfer device according to the invention over which the transfer covering is guided;
  • Fig. 5 a further embodiment of the fixed transfer device;
  • Fig. 6 a view of a Fujifilm print (Ultra Extreme Low Pressure 5 LW) of the transfer area of a transfer arrangement designed according to the invention with a 900 mm wide transfer covering;
  • Fig. 7 a detailed view of a Fujifilm print (Ultra Extreme Low Pressure 5 LW) of the transfer area of a transfer arrangement designed according to the invention;

Gleiche Bezugszeichen in den einzelnen Figuren bezeichnen gleiche Bauteile.The same reference symbols in the individual figures denote the same components.

In Fig. 1 ist eine Tissuemaschine 2 mit der erfindungsgemäßen Pressanordnung dargestellt.In Fig. 1 shows a tissue machine 2 with the press arrangement according to the invention.

Über einen Stoffauflauf 22 wird die Faserstoffsuspension der Formiereinheit zugeführt, sie tritt dabei zwischen einer Brustwalze 24 und einer Formierwalze 23 aus dem Stoffauflauf 22 aus. Die Brustwalze 24 ist von einer äußeren Bespannung 25 umschlungen. In der Formiereinheit wird die Faserstoffsuspension soweit entwässert, dass sich eine Faserstoffbahn 1 auf der Bespannung 26 bildet. Die Bespannung 26 ist vorzugsweise ein Filz, welcher die Faserstoffbahn 1 zu einer Schuhpresswalze (Presswalze) 4 befördert.The pulp suspension is fed to the forming unit via a headbox 22; it emerges from the headbox 22 between a breast roll 24 and a forming roll 23. The breast roll 24 is wrapped in an outer covering 25. In the forming unit, the fiber suspension is dewatered to such an extent that a fiber web 1 is formed on the covering 26. The covering 26 is preferably a felt which conveys the fibrous web 1 to a shoe press roll (press roll) 4.

Die erfindungsgemäße Pressanordnung besteht aus einer Langnip-Presseinheit 3, die eine Presswalze 4 mit einem umlaufenden Pressmantel 5 und eine Gegenwalze 6 aufweist. Zwischen der Presswalze 4 und der Gegenwalze 6 ist ein verlängerter Pressspalt 7 ausgebildet.The press arrangement according to the invention consists of a long-nip press unit 3, which has a press roller 4 with a rotating press jacket 5 and a counter roller 6. An extended press nip 7 is formed between the press roll 4 and the counter roll 6.

Die erfindungsgemäße Pressanordnung funktioniert nun auf folgende Weise:
Die Faserstoffbahn 1 wird auf dem Filz 26 durch den verlängerten Pressspalt 7 geführt. Im verlängerten Pressspalt 7 nimmt der Filz 26 Feuchtigkeit von der Faserstoffbahn 1 auf. Der Filz 26 wird unmittelbar nach dem verlängerten Pressspalt 7 von der Faserstoffbahn 1 getrennt, damit eine Rückbefeuchtung der Faserstoffbahn vermieden wird.The press arrangement according to the invention now works in the following way:
The fibrous web 1 is guided on the felt 26 through the extended press nip 7. In the extended press nip 7, the felt 26 absorbs moisture from the fibrous web 1. The felt 26 is separated from the fibrous web 1 immediately after the extended press nip 7, so that rewetting of the fibrous web is avoided.

Nach dem verlängerten Pressspalt 7 läuft die Faserstoffbahn 1 nicht mehr am Filz 26 sondern am Pressmantel 5 der Presswalze 4 weiter. Der Pressmantel 5 übergibt in einem Transferbereich 8 die Faserstoffbahn 1 auf eine Transferbespannung 9. Der Faserstoffbahntransfer auf die Transferbespannung 9 wird durch die besaugte Transfervorrichtung 10 unterstützt. Die Transferbespannung 9 ist im vorliegenden Beispiel strukturiert und permeabel.After the extended press nip 7, the fibrous web 1 no longer runs on the felt 26 but on the press jacket 5 of the press roll 4. The press jacket 5 transfers the fibrous web 1 to a transfer covering 9 in a transfer area 8. The transfer of fibrous web to the transfer covering 9 is supported by the transfer device 10 with suction. The transfer covering 9 is structured and permeable in the present example.

Im Transferbereich 8 erfolgt im vorliegenden Beispiel ein weiterer Bahnbehandlungsschritt der Faserstoffbahn 1, nämlich eine Kreppung. Dafür bewegt sich die Oberfläche der Transferbespannung 9 etwas langsamer (geringere Relativgeschwindigkeit) durch den Transferbereich 8 als der Pressmantel 5, somit wird die Faserstoffbahn 1 bei der Übergabe auf die Transferbespannung 9 etwas gestaucht bzw. gekreppt.In the present example, a further web treatment step of the fibrous web 1, namely creping, takes place in the transfer area 8. For this, the surface of the transfer covering 9 moves somewhat more slowly (lower relative speed) through the transfer area 8 than the press cover 5, so the fibrous web 1 is somewhat compressed or creped when it is transferred to the transfer covering 9.

Im Anschluss an die mechanische Entwässerung in der Langnip-Presseinheit 3 erfolgt die thermische Trocknung auf einem Yankee-Zylinder 27, von dem die trockene Faserstoffbahn 1 beispielsweise mit Hilfe eines Schabers abgeschabt wird.Following the mechanical dewatering in the long-nip press unit 3, thermal drying takes place on a Yankee cylinder 27, from which the dry fibrous web 1 is scraped off with the aid of a scraper, for example.

Die Konditionierung der Transferbespannung 9 sollte derart erfolgen, dass es zu keiner bzw. nur zu einer sehr geringen Befeuchtung der Transferbespannung 9 durch den Konditionierungsvorgang kommt. Daher kann die Konditionierung beispielsweise mit Druckluft oder einem Druckluftschwert durchgeführt werden. Bei einer Konditionierung mit Wasser muss gewährleistet sein, dass die Transferbespannung 9 getrocknet bzw. trocken gesaugt wird, bevor sie wieder die Faserstoffbahn 1 übernimmt.The conditioning of the transfer covering 9 should take place in such a way that there is no or only a very slight moistening of the transfer covering 9 as a result of the conditioning process. Therefore, the conditioning can be done, for example, with compressed air or a compressed air sword be performed. In the case of conditioning with water, it must be ensured that the transfer covering 9 is dried or sucked dry before it takes over the fibrous web 1 again.

Zur weiteren Fixierung der Faserstoffbahn 1 auf der Transferbespannung 9 ist es vorteilhaft, wenn nach dem Transfer der Faserstoffbahn 1 vom Pressmantel 5 auf die Transferbespannung 9 eine Fixierung der Faserstoffbahn 1 an der Transferbespannung 9 erfolgt. Die Fixierung kann durch ein Führen der auf der Transferbespannung 9 liegenden Faserstoffbahn 1 über einen Vakuumkasten 14 erfolgen, wobei das am Vakuumkasten 14 wirkende Vakuum die Faserstoffbahn 1 an die Transferbespannung 9 ansaugt.To further fix the fibrous web 1 on the transfer covering 9, it is advantageous if the fibrous web 1 is fixed on the transfer covering 9 after the transfer of the fibrous web 1 from the press jacket 5 to the transfer covering 9. The fixation can take place by guiding the fibrous web 1 lying on the transfer covering 9 over a vacuum box 14, the vacuum acting on the vacuum box 14 sucking the fibrous web 1 onto the transfer covering 9.

Figur 2 zeigt eine Detailansicht des Übergabebereichs der Faserstoffbahn 1 auf die Transferbespannung 9. Die auf dem Pressmantel 5 liegende Faserstoffbahn 1 wird im Transferbereich 8 auf die Transferbespannung 9 übergeben. Diese Übergabe wird durch die besaugte Transfervorrichtung 10 unterstützt. Man erkennt, dass der Pressmantel 5 im Transferbereich 8 nicht unterstützt ist. Das heißt, dass im Transferbereich 8 auf der der Faserstoffbahn 1 gegenüberliegenden Seite 15 des Pressmantels 5 keine Stützelemente vorgesehen sind. Vor dem Transferbereich 8 ist in der Presswalze 4 ein erstes Stützelement 12 für den Pressmantel 5 vorgesehen. Der Winkel α von der Presswalzenachse (Presswalzenzenzrum) 19 aus betrachtet zwischen dem vor dem Transferbereich 8 liegenden Stützelement 12 und dem Transferbereich 8 beträgt hier weniger als 15°, beispielsweise 6°. Figure 2 shows a detailed view of the transfer area of the fibrous web 1 to the transfer covering 9. The fibrous web 1 lying on the press jacket 5 is transferred to the transfer covering 9 in the transfer area 8. This transfer is supported by the evacuated transfer device 10. It can be seen that the press jacket 5 is not supported in the transfer area 8. This means that no support elements are provided in the transfer area 8 on the side 15 of the press jacket 5 opposite the fibrous web 1. A first support element 12 for the press cover 5 is provided in the press roll 4 in front of the transfer area 8. The angle α viewed from the press roll axis (press roll center) 19 between the support element 12 located in front of the transfer area 8 and the transfer area 8 is here less than 15 °, for example 6 °.

Nach dem Transferbereich 8 ist in der Presswalze 4 ein zweites Stützelement 13 vorgesehen, auf welchem der Pressmantel 5 abgestützt ist. Der Winkel β zwischen dem Stützelement 13 und dem Transferbereich 8 beträgt hier weniger als 30°.After the transfer area 8, a second support element 13 is provided in the press roll 4, on which the press cover 5 is supported. The angle β between the support element 13 and the transfer area 8 is less than 30 ° here.

Im Transferbereich 8 gibt es keine Vor- oder Nachumschlingung des Pressmantels 5 durch die Transferbespannung 9. In diesem Sinne ist der Winkel γ zwischen der über die stehende Transfervorrichtung 10 in den Transferbereich 8 geführten Transferbespannung 9 und der Tangente 20 an den Pressmantel 5 im Transferbereich 8 größer Null Grad, wodurch erst im Transferbereich 8 ein Kontakt von Transferbespannung 9, Faserstoffbahn 1 und Pressmantel 5 erfolgt. Ebenso ist der Winkel δ zwischen der aus dem Transferbereich 8 geführten Transferbespannung 9 und der Tangente 21 an den Pressmantel 5 im Transferbereich 8 größer Null Grad, sodass die Transferbespannung 9 den Pressmantel 5 nach dem Transferbereich 8 nicht umschlingt und ein Kontakt der Transferbespannung 9, Faserstoffbahn 1 und Pressmantel 5 nur im Transferbereich 8 gegeben ist.In the transfer area 8 there is no pre- or post-wrapping of the press cover 5 by the transfer cover 9. In this sense, the angle γ between the transfer cover 9 guided over the stationary transfer device 10 into the transfer area 8 and the tangent 20 to the press cover 5 in the transfer area 8 greater than zero degrees, as a result of which the transfer covering 9, fibrous web 1 and press cover 5 only come into contact in the transfer area 8. Likewise, the angle δ between the transfer cover 9 guided out of the transfer area 8 and the tangent 21 to the press cover 5 in the transfer area 8 is greater than zero degrees, so that the transfer cover 9 does not wrap around the press cover 5 after the transfer area 8 and the transfer cover 9 makes contact with the fibrous web 1 and press jacket 5 is only given in the transfer area 8.

Die radiale Eintauchtiefe der stehenden Transfervorrichtung 10 in den Pressmantel 5 der Presswalze 4 wird durch die Einstellvorrichtung 11 außerhalb der Presswalze 4 eingestellt. So kann die stehende Transfervorrichtung 10 auf einem drehbaren Hebelarm 29 an der Stuhlung befestigt sein, wobei entsprechend dem Drehpunkt 30 des Hebelarms ein - mit der Wahl des Mittelpunkts 19 der Presswalze 4 als Referenz - radiales Eintauchen in den Pressmantel 5 möglich wird. Die Einstellvorrichtung 11 weist eine Einstellschraube 28 auf, über die die Eintauchtiefe der Transfervorrichtung 10 einstellbar ist.The radial depth of immersion of the stationary transfer device 10 in the press jacket 5 of the press roll 4 is set by the setting device 11 outside the press roll 4. For example, the stationary transfer device 10 can be attached to the frame on a rotatable lever arm 29, with radial immersion in the press jacket 5 being possible according to the pivot point 30 of the lever arm - with the selection of the center 19 of the press roller 4 as a reference. The adjusting device 11 has an adjusting screw 28 by means of which the immersion depth of the transfer device 10 can be adjusted.

In Figur 3 ist der Transferbereich 8 aus Figur 2 im Detail dargestellt. Man erkennt, dass die Transfervorrichtung 10 als Schlitzsauger ausgeführt ist. Durch den Saugschlitz 16 erfolgt die Besaugung der Transferbespannung 9 zwischen einer ersten 17 und einer zweiten Saugschlitzkante 31. Der Schlitzsauger 10 weist einen gekrümmten Bereich 18 vor der ersten einlaufseitigen Saugschlitzkante 17 auf. Die Bogenlänge des gekrümmten Bereichs 18 bis zur ersten Saugschlitzkante 17 ist beispielsweise kleiner 30 mm, bevorzugt kleiner 15 mm. Der Kontakt der feststehenden Transfervorrichtung 10 mit der Transferbespannung 9, der Faserstoffbahn 1 und dem Pressmantel 5 liegt hier im gekrümmten Bereich 18 vor der ersten einlaufseitigen Saugschlitzkante 17, womit der Transferbereich 8 ebenso im gekrümmten Bereich 18 vor der ersten einlaufseitigen Saugschlitzkante 17 liegt. Im vorliegenden Beispiel liegt der Saugschlitz 16 der Transfervorrichtung 10 bereits außerhalb des Transferbereiches 8, das heißt, im Bereich des Saugschlitzes 16 wird der Pressmantel 5 nicht mehr von der Transferbespannung 9 berührt. Die Transferbespannung 9 läuft danach über den Auslaufbereich 32 der Transfervorrichtung 10.In Figure 3 the transfer area 8 is off Figure 2 shown in detail. It can be seen that the transfer device 10 is designed as a slot suction device. The suction slit 16 is used to suction the transfer covering 9 between a first 17 and a second suction slit edge 31. The slotted suction device 10 has a curved region 18 in front of the first suction slit edge 17 on the inlet side. The arc length of the curved region 18 up to the first suction slot edge 17 is, for example, smaller 30 mm, preferably less than 15 mm. The contact of the stationary transfer device 10 with the transfer covering 9, the fibrous web 1 and the press cover 5 is here in the curved area 18 in front of the first inlet-side suction slot edge 17, whereby the transfer area 8 is also in the curved area 18 in front of the first inlet-side suction slot edge 17. In the present example, the suction slot 16 of the transfer device 10 is already outside the transfer area 8, that is, in the area of the suction slot 16, the press jacket 5 is no longer touched by the transfer covering 9. The transfer covering 9 then runs over the run-out area 32 of the transfer device 10.

In Figur 4 ist die Transfervorrichtung 10 dargestellt. Der Saugschlitz 16 ist hier 15 mm breit. Die Transferbespannung 9 läuft vorzugsweise im gekrümmten Bereich 18 vor der ersten Saugschlitzkannte 17 auf die Transfervorrichtung 10 auf. Der gekrümmte Bereich 18 ist hier 12 mm lang.In Figure 4 the transfer device 10 is shown. The suction slot 16 is 15 mm wide here. The transfer covering 9 preferably runs onto the transfer device 10 in the curved area 18 in front of the first suction slot edge 17. The curved area 18 is 12 mm long here.

Figur 5 zeigt eine weitere mögliche Ausführungsform der Transfervorrichtung 10. Der Auslaufbereich 32 der Transfervorrichtung ist hier im Gegensatz zu Figur 4 abfallend ausgeführt. Figure 5 shows a further possible embodiment of the transfer device 10. The outlet area 32 of the transfer device is in contrast to FIG Figure 4 running downhill.

Figur 6 zeigt einen Fujifilm-Abdruck 33 (Ultra Extreme Low Pressure 5 L W) des Transferbereichs 8 einer erfindungsgemäß ausgeführten Transferanordnung. Dazu wird bei stehender und abgeschwenkter Transfervorrichtung 10 der druckempfindliche Fujifilm in den Spalt zwischen dem unter pneumatischem Druck stehenden Pressmantel 5 und der Transferbespannung 9 eingelegt. Dann wird die feststehende Transfervorrichtung 10 samt Transferbespannung 9 in Betriebsposition gegen den unter pneumatischem Druck stehenden Pressmantel 5 geschwenkt. Entsprechend der Berührung der Komponenten - stehende Transfervorrichtung 10, Transferbespannung 9, Fujifilm und Pressmantel 5 - verfärbt sich der druckempfindliche Film, wobei eine Verfärbung einen Kontakt anzeigt, bzw. die Verfärbung den Transferbereich 8 repräsentiert. Der gezeigte Fujifilmabdruck 33 zeigt einen Transferbereich 8 mit einer Länge von weniger als 5 mm in Laufrichtung der Faserstoffbahn 1, innerhalb derer die Faserstoffbahn 1 vom Pressmantel 5 der Presswalze 4 auf die Transferbespannung 9 übergeben wird. Die Länge des Kontakts der Transferbespannung 1 und des Pressmantels 5 normal zur Laufrichtung (quer zur Maschinenlaufrichtung) der Faserstoffbahn 1 ist in diesem Fall 900 mm, entsprechend der in diesem Fall vorliegenden Breite der Transferbespannung von 900 mm. Figure 6 shows a Fujifilm imprint 33 (Ultra Extreme Low Pressure 5 LW) of the transfer area 8 of a transfer arrangement designed according to the invention. For this purpose, with the transfer device 10 standing and swiveled away, the pressure-sensitive Fujifilm is inserted into the gap between the press jacket 5, which is under pneumatic pressure, and the transfer covering 9. Then the stationary transfer device 10 together with the transfer covering 9 is pivoted in the operating position against the press jacket 5, which is under pneumatic pressure. Depending on the contact of the components - standing transfer device 10, transfer cover 9, Fujifilm and press cover 5 - the pressure-sensitive film changes color, a discoloration indicating a contact or the discoloration representing the transfer area 8. The shown Fujifilm imprint 33 shows a transfer area 8 with a length of less than 5 mm in the running direction of the fibrous web 1, within which the fibrous web 1 is transferred from the press cover 5 of the press roll 4 to the transfer covering 9. The length of the contact between the transfer covering 1 and the press jacket 5 normal to the running direction (transverse to the machine running direction) of the fibrous web 1 is 900 mm in this case, corresponding to the width of the transfer covering of 900 mm in this case.

Figur 7 zeigt einen Detailausschnitt des Fujifilm-Abdrucks 33 (Ultra Extreme Low Pressure 5 L W) des in Figur 6 ganzheitlich dargestellten Abdrucks. Zur besseren Quantifizierung ist eine Skala dargestellt. Die Skala zeigt in Laufrichtung der Faserstoffbahn 1, wobei die Skaleneinheit [cm] ist. Da die Verfärbung den Transferbereich 8 repräsentiert, ist gut erkennbar, dass im gezeigten Ausschnitt des Fujifilm-Abdrucks 33 ein Transferbereich 8 mit einer Länge von weniger als 5 mm in Laufrichtung der Faserstoffbahn 1 gegeben ist. Figure 7 shows a detail of the Fujifilm imprint 33 (Ultra Extreme Low Pressure 5 LW) of the in Figure 6 holistically represented impression. A scale is shown for better quantification. The scale points in the running direction of the fibrous web 1, the scale unit being [cm]. Since the discoloration represents the transfer area 8, it can be clearly seen that in the shown section of the Fujifilm imprint 33 there is a transfer area 8 with a length of less than 5 mm in the running direction of the fibrous web 1.

Claims (20)

  1. Method for treating a pulp web (1) in a paper or tissue machine (2) in an extended-nip press unit (3) with a press roll (4), which is designed as a shoe roll and which has a rotating press belt (5) and a backing roll (6), where the pulp web (1) is dewatered in an extended press nip (7) between the press belt (5) of the press roll (4) and the backing roll (6), where the pulp web (1) is brought to a transfer area (8) on the rotating press belt (5) of the press roll (4) after the extended press nip (7), and where the pulp web (1) is passed on from the press belt (5) to a transfer fabric (9) in the transfer area (8), characterized in that the transfer fabric (9) is guided over a stationary transfer device (10) in the transfer area (8).
  2. Method according to claim 1, characterized in that suction is applied to the transfer device (10) in the transfer area (8) in such a way as to support transfer of the pulp web (1) to the transfer fabric (9).
  3. Method according to claim 1 or 2, characterized in that the transfer device (10) is inserted radially inwards into the press belt (5) of the press roll (4) by between 0 and 20 mm in the transfer area (8).
  4. Method according to claim 3, characterized in that the radial depth of insertion of the transfer device (10) into the press belt (5) of the press roll (4) in the transfer area (8) is set by means of a device (11) outside the press roll (4).
  5. Method according to one of claims 1 to 4, characterized in that the pulp web (1) is transferred from the press belt (5) to a structured transfer fabric (9) in the transfer area (8).
  6. Method according to one of claims 1 to 5, characterized in that the pulp web (1) is transferred from the press belt (5) to a permeable transfer fabric (9) in the transfer area (8).
  7. Method according to one of claims 1 to 6, characterized in that the pulp web (1) is transferred to the transfer fabric (9), viewed in running direction of the pulp web (1), in the transfer area (8) within less than 10 mm, preferably within less than 5 mm, ideally along one line.
  8. Method according to one of claims 1 to 7, characterized in that the transfer fabric (9) has a lower speed than the press belt (5) when the pulp web (1) is transferred from the press belt (5) to the transfer fabric (9).
  9. Method according to one of claims 1 to 8, characterized in that the press belt (5) of the press roll (4) is supported by supporting elements (12, 13) on the side (15) opposite the pulp web (1) before and after the transfer area (8).
  10. Method according to claim 9, characterized in that the supporting elements (12, 13) arranged before and after the transfer area (8) on the side (15) of the press belt (5) opposite the pulp web (1) press radially outwards out of the press belt (5) of the press roll (4) by between 0 and 20 mm.
  11. Method according to one of claims 1 to 10, characterized in that the pulp web (1) is guided onto the transfer fabric (9) via a suction device (14) to secure it on the transfer fabric (9) after transfer from the press belt (5) of the press roll (4).
  12. Press arrangement for treating a pulp web (1) in a paper or tissue machine (2) in an extended-nip press unit (3), in which the pulp web (1) is guided through an extended press nip (7) in the extended-nip press unit (3), where the extended-nip press unit (3) has a press roll (4) with revolving press belt (5) designed as a shoe press roll, and a backing roll (6), where the pulp web (1) is guided on the rotating press belt (5) of the press roll (4) to a transfer fabric (9), which receives the pulp web (1) in a transfer area (8) after the extended press nip (7) of the extended-nip press unit (3), characterized in that the transfer fabric (9) is guided over a stationary transfer device (10) in the transfer area (8).
  13. Press arrangement according to claim 12, characterized in that the side (15) of the press belt (5) of the press roll (4) opposite the pulp web (1) is not supported in the transfer area (8).
  14. Press arrangement according to claim 13, characterized in that supporting elements (12, 13) that are lubricated hydrostatically and/or hydrodynamically are provided inside the press belt (5) before and after the transfer area (8).
  15. Press arrangement according to one of claims 12 to 14, characterized in that the stationary transfer device (10) in the transfer area (8) is a slotted suction device (10).
  16. Press arrangement according to claim 15, characterized in that the slotted suction device (10) has a curved area (18) in front of an inlet side suction slot edge (17).
  17. Press arrangement according to one of claims 12 to 16, characterized in that the transfer fabric (9) runs onto the transfer device (10) before transfer of the pulp web (1) from the press belt (5) of the press roll (4).
  18. Press arrangement according to claim 14, characterized in that the angle (α) between the supporting element (12) in front of the transfer area (8) and the transfer area (8), viewed from the centre of the press roll (19), is less than 15° and in that the angle (β) between the transfer area (8) and the supporting element (13) after the transfer area (8) is less than 30°.
  19. Press arrangement according to one of claims 12 to 18, characterized in that the angle (γ) between the transfer fabric (9) guided into the transfer area (8) and the tangent (20) to the press belt (5) is greater than zero degrees in the transfer area (8) so that the transfer fabric (9) is not wrapped round the press belt (5) in front of the transfer area (8) .
  20. Press arrangement according to one of claims 12 to 19, characterized in that the angle (δ) between the transfer fabric (9) carried out of the transfer area (8) and the tangent (21) to the press belt (5) in the transfer area (8) is greater than zero degrees so that the transfer fabric (9) is not wrapped round the press belt (5) after the transfer area (8).
EP19707727.4A 2018-03-01 2019-02-19 Method and device for treating a fibrous material web in a long nip pressing unit Active EP3717694B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19707727T PL3717694T3 (en) 2018-03-01 2019-02-19 Method and device for treating a fibrous material web in a long nip pressing unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50177/2018A AT520319B1 (en) 2018-03-01 2018-03-01 METHOD AND DEVICE FOR TREATING A FIBROUS WEB IN A LANGNIP PRESS UNIT
PCT/EP2019/054041 WO2019166271A1 (en) 2018-03-01 2019-02-19 Method and device for treating a fibrous material web in a long nip pressing unit

Publications (2)

Publication Number Publication Date
EP3717694A1 EP3717694A1 (en) 2020-10-07
EP3717694B1 true EP3717694B1 (en) 2021-06-23

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EP19707727.4A Active EP3717694B1 (en) 2018-03-01 2019-02-19 Method and device for treating a fibrous material web in a long nip pressing unit

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US (1) US11414816B2 (en)
EP (1) EP3717694B1 (en)
CN (1) CN111868327B (en)
AT (1) AT520319B1 (en)
BR (1) BR112020013630A2 (en)
CA (1) CA3091525C (en)
ES (1) ES2883776T3 (en)
MX (1) MX2020008840A (en)
PL (1) PL3717694T3 (en)
WO (1) WO2019166271A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT522784B1 (en) * 2020-02-25 2021-02-15 Andritz Ag Maschf DEVICE AND METHOD FOR MANUFACTURING A FIBER WEB
CN115235215A (en) * 2021-02-10 2022-10-25 王婧怡 Textile cloth drying equipment

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DE3815278A1 (en) * 1988-05-05 1989-11-16 Voith Gmbh J M PRESS RELEASE OF A MACHINE FOR THE PRODUCTION OF A FIBROUS MATERIAL SHEET, IN PARTICULAR PAPER SHEET
US5171389A (en) * 1991-11-08 1992-12-15 Albany International Corp. Spiral construction of grooved long nip press
US5741402A (en) * 1996-09-03 1998-04-21 The Procter & Gamble Company Vacuum apparatus having plurality of vacuum sections for controlling the rate of application of vacuum pressure in a through air drying papermaking process
DE19654198A1 (en) 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Machine for the production of a fibrous web
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SE511702C2 (en) 1998-03-20 1999-11-08 Valmet Karlstad Ab Paper machine and method for making tissue paper
FI104644B (en) * 1998-08-17 2000-03-15 Valmet Corp Method and apparatus in a paper machine for transferring a web from a molding portion to a pressing portion
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DE10233920A1 (en) 2002-07-25 2004-02-12 Voith Paper Patent Gmbh Papermaking machine dewaters tissue paper or web of fibrous hygiene web material in conjunction with a dewatering belt with reversible water take-up
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DE102008043997A1 (en) * 2008-11-24 2010-05-27 Voith Patent Gmbh Machine for producing and / or treating a fibrous web
AT508331B1 (en) 2009-05-19 2011-05-15 Andritz Ag Maschf METHOD AND DEVICE FOR TREATING A FIBROUS CAR TRACK IN A LANGNIP PRESS UNIT
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AT518060B1 (en) * 2016-07-07 2017-07-15 Klaus Ing Bartelmuss Apparatus for cleaning a felt belt in a plant for producing a paper tape

Also Published As

Publication number Publication date
PL3717694T3 (en) 2021-11-15
MX2020008840A (en) 2020-10-05
WO2019166271A1 (en) 2019-09-06
BR112020013630A2 (en) 2021-01-12
AT520319B1 (en) 2019-03-15
CA3091525A1 (en) 2019-09-06
ES2883776T3 (en) 2021-12-09
US20210087746A1 (en) 2021-03-25
AT520319A4 (en) 2019-03-15
CN111868327A (en) 2020-10-30
CA3091525C (en) 2023-09-12
CN111868327B (en) 2022-11-04
US11414816B2 (en) 2022-08-16
EP3717694A1 (en) 2020-10-07

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