EP1903142A1 - Système pour élargir une bande fibreuse, procédé de controller le transfert de la bande directrice et machine pour la fabrication d'une bande fibreuse - Google Patents

Système pour élargir une bande fibreuse, procédé de controller le transfert de la bande directrice et machine pour la fabrication d'une bande fibreuse Download PDF

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Publication number
EP1903142A1
EP1903142A1 EP07111929A EP07111929A EP1903142A1 EP 1903142 A1 EP1903142 A1 EP 1903142A1 EP 07111929 A EP07111929 A EP 07111929A EP 07111929 A EP07111929 A EP 07111929A EP 1903142 A1 EP1903142 A1 EP 1903142A1
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EP
European Patent Office
Prior art keywords
web
width
transfer
machine
residual
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Granted
Application number
EP07111929A
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German (de)
English (en)
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EP1903142B1 (fr
Inventor
Klaus Meier
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1903142A1 publication Critical patent/EP1903142A1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the invention relates to a system for spreading a fibrous web, in detail with the features of the preamble of claim 1; Further, a method for controlling the Koch Industries- or edge strip transfer and a machine for producing fibrous webs with such a system.
  • Machines for producing fibrous webs are known in a large number of designs. These include a so-called wet part, which is followed by a dry part. In this case, the fibrous web passes along its Faserstoffbahn arrangementsweges at least one fibrous web treatment device.
  • a transfer strip is separated from the fibrous web and passed through subsequent management and / or treatment facilities, the transfer strip gradually to the full fibrous web width is broadened.
  • This type of web presentation is standard both for paper and board making machines with at least one headbox, one wet end, one dryer section and possibly several subsequent processing lots.
  • transfer strip which is also referred to as edge strip
  • various facilities are previously known. These are for example in the form of so-called Stenderabtschvorraumen, water jet cutting devices, laser cutting devices and so on.
  • the residual strip or the residual web produced by the separating process is discharged at the separating point or behind it into a collecting device, in particular in the form of a chest below the paper machine.
  • a collecting device in particular in the form of a chest below the paper machine.
  • the transfer strips are forced by vacuum into the desired position, so that they continue on the guide elements were-the, while the residual web usually slides down.
  • This consists of several individual vacuum reduction zones, which are separately controllable, whereby the effective width of the entire vacuum zone is changeable transversely to the web running direction.
  • a device for detecting a tear of a web and thus the required Wiederüberstructs is off EP 1 640 497 A2 previously known.
  • the device for detecting the tear-off is intended and designed to respond to the demolition of the transfer strip or the material web during the transfer of the material web, in particular during the enlargement of the width of the transfer strip. Failures during web threading, especially during broad travel, can thus be automatically detected and quickly detected, and a restart of the web transfer and spreading can be initiated.
  • the invention is therefore based on the object to dominate the entrainment of the residual web edge errors with certainty and unnecessary downtime and restart times, which lead to production losses to avoid. Furthermore, a railway overpass after a successful shutdown with high security can be done without errors, with the detection of web breaks as soon as possible a restart should be executable.
  • a system for spreading a fibrous web in a machine for producing fibrous webs, in particular paper, board or tissue webs comprises at least one separating device, which is movable transversely to the machine direction and the fibrous web in at least two partial webs, a first so-called edge or transfer strip and a second track, the so-called residual track, divided. The latter is continued to a collecting and / or conditioning device.
  • a stabilization device for stabilizing the residual web is provided for controlling the transfer operation and the possibly resulting edge fault on the transfer strip, which is arranged at least between the starting position of the separating device and the end position of the separating device viewed transversely to the machine direction.
  • machine direction and “transverse to the machine direction” relate essentially to the fibrous web running direction.
  • the machine direction describes the extent of the machine for producing a fibrous web, in which the system according to the invention is integrated, in the direction of the individual to be passed treatment facilities and thus the direction in which the fibrous web passes first as a pulp suspension and later as a fibrous web, the machine.
  • Transverse to the machine direction means so across the Pulp web running direction and generally corresponds to the width direction of the machine for the production of fibrous webs.
  • the solution according to the invention makes it possible to guide the residual web safely even at high machine speeds to the collecting and / or conditioning device and thus to avoid unwanted entrainment in any direction.
  • the fibrous web, in particular the transfer strip can thus be safely routed to the next treatment unit and unwanted stoppages caused by an undesirable entrainment of residual web components are avoided. Overall, this leads to a reduction in downtime and thus production downtime.
  • the separation of the fibrous web into the at least two partial webs takes place with a separating device comprising at least one separating element.
  • a separating device comprising at least one separating element.
  • a separating element is sufficient.
  • the one separating element is characterized by a starting position relative to the fibrous web, which is disposed away from the lateral fibrous web edge at a lateral distance which corresponds to the desired initial marginal strip width.
  • the separating element is preferably arranged on the guide side of the machine for producing fibrous webs for the purpose of easy accessibility, and the movement of the separating element into the end position, which corresponds at least to the fibrous web width, takes place in the direction of the drive side, i. the side of the machine on which the drive units are arranged.
  • the initial position can simultaneously correspond to the storage position of the separating element.
  • the initial position is freely adjustable for maintenance and an adaptation to changing boundary conditions and the actual storage position is located outside the fibrous web width on the leader page.
  • the transfer strip not at the edge but within the width of the fibrous web, ie substantially in the middle or slightly offset.
  • at least two separating elements are provided, the initial positions within the fibrous web width in the width direction are either immediately adjacent to each other or spaced apart from each other at a distance corresponding to the desired Togethersüber KunststoffstMailbreite.
  • the separating elements move from this initial position respectively in the direction of the fibrous web edges, while the fibrous web continues to run and thus produce a central transfer strip, which preferably increases uniformly in both directions, provided that the separating elements are at the same speed in the direction of the drive side and in the direction of the leader the machine moves.
  • This solution has the advantage that due to the two-sided widening at the same speeds of the individual separating elements and fiber web throughput speeds of the transfer strip can be driven much faster on the full fibrous web width.
  • the resulting two residual webs are smaller in terms of their maximum extent in the width direction of the machine and the necessary stabilizing devices can also be designed with a smaller size and lower power.
  • this solution can also be used in installation situations with little space.
  • the choice of the separation system used is not limited.
  • a separation device or separating elements the known systems can be used.
  • a so-called hydrojet i. a separating element in the form of a movable nozzle, which generates a directed against the fibrous web fluid jet, preferably water jet, which separates the fibrous web used.
  • This can be operated with fresh water or with fluid from other process cycles of the machine for the production of fibrous webs.
  • Other possibilities are the use of mechanical systems, such as knives or blades or non-contact devices, such as lasers.
  • these spatially close to each other but also be arranged spatially separated from each other.
  • the separation into marginal and residual strips with closed guidance of the fibrous web on an endlessly circulating belt or felt or corresponding transfer without possibility of removal of the residual web already take place well before the effective range of the stabilizing device.
  • the machine with a wet part and a dry part already in the wet part or at the beginning of the dry part.
  • the stabilization device has an effective region which extends over at least a partial region of the fibrous web web width, preferably the theoretically maximum residual breadth, which corresponds to the travel width of the severing device. This makes it possible to support the entire residual web width when guided in the collecting and / or processing device.
  • the stabilizing device can also extend over the entire fibrous web width, wherein the effective range should then be adjustable in any case.
  • the effective range of the stabilizing device is preferably infinitely adjustable, in particular adaptable to the width of the residual web.
  • the stabilization device comprises at least one stabilizing element, which can be designed in many forms.
  • a so-called foil plate is provided, this is formed by a plate-shaped or wider strip-shaped element which extends transversely to the fibrous web running direction across the width of the machine and against the guide direction of the residual web is considered at this at an angle.
  • a gap is formed, in which by drag air, a negative pressure is generated, which sucks the residual web in this area against the foil plate.
  • the effective range is determined here by the foil width transversely to the machine direction.
  • a deactivation can take place in the simplest case by pivoting the entire foil plate, wherein the pivoting preferably takes place about an axis transverse to the machine or fibrous web running direction to the effect that, for example, the angle of attack relative to the residual web is completely changed ge.
  • this can be divided into several subzones.
  • the foil plate can also consist of a plurality of individual Foilplattenettin which are arranged side by side transversely to the fibrous web running direction, wherein, if necessary, in each case to reduce the stabilization zone width swings out of the individual sub-zones forming Foilplatten shame.
  • the foil plate or the individual foil plate elements can also be displaced counter to the machine direction.
  • the suction device in order to increase the suction effect of the foil plate, it is also possible to associate a suction device which additionally or optionally sucks the intermediate space formed between the residual web and the foil plate.
  • the suction device can be characterized by at least one suction zone whose width is either fixed or preferably adjustable to adapt to the residual web width, or a plurality of juxtaposed Operaaugzonen be characterized.
  • the suction device has a multiplicity of suction zones arranged juxtaposed transversely to the fibrous web running direction, which are preferably, but not necessarily, characterized by the same dimensions, in particular in width, and individually and / or in groups and / or jointly controllable.
  • the corresponding zones are assigned means for controlling, in particular valve devices.
  • a further second embodiment consists in the use of a suction device which is considered stationary, i. fixed unit may be carried out with a stationary support surface or as a suction roll, which is a stationary suction zone forming means over which an air-permeable belt is guided to form a support surface acts.
  • the arrangement of the suction zone is carried out such that it describes a part of the guide path of the residual web.
  • the design as a suction roll has the advantage that the jacket can move and thereby also entrainment of the residual web.
  • the suction zones in both embodiments - suctioned foil plate and suction device - can be designed such that they are variably adjustable with respect to the size of the acting negative pressure and also at least one adjustability across the width and thus adjustability of the effective range is given.
  • the adjustability across the width can be made stepless or in stages, also over the entire width or sectionally.
  • the suction zones are divided into sections. The subdivision can be done arbitrarily.
  • sections of the same size, in particular width and length are provided in the machine direction.
  • Each individual section can be either individually controllable and / or a plurality or all are controlled together.
  • the suction power can be varied locally within a section.
  • the sections can also be activated or deactivated individually or in groups.
  • Another particularly advantageous embodiment consists in the execution of the stabilization device as injector.
  • a fluid is applied to the residual web or directed such that the fluid emerges at least substantially parallel to the fibrous web surface of the residual web as a propulsion jet or propellant jet curtain and entrains them due to the resulting forces.
  • At least one directional component is oriented such that it is aligned parallel to the desired fibrous web guiding direction.
  • the stabilization device comprises at least one injector element with a specific effective width, preferably a plurality of individual injector elements arranged side by side transversely to the fibrous web running direction, the individual area of action of which overlaps one another.
  • the injector effect is generated by a fluid jet or curtain.
  • a fluid jet or curtain As fluids find gas, water, steam or preferably air, which is present anyway, use.
  • a propulsion jet is generated. This can be adjusted by a valve, preferably a fine regulating valve, with regard to its parameters, in particular outlet velocity, outlet cross section, jet length, outlet geometry of the jet e.t.c.
  • the fluid jet preferably runs parallel, or slightly different, from the remaining web travel direction.
  • the effective width is preferably adjustable, in particular so that this changes synchronously with the spreading of the separating element, i. becomes narrower with enlargement of the transfer strip.
  • the individual injector elements can also be controlled individually or in groups or together or a combination of these options optionally or optionally.
  • the arrangement of the system in machines for the production of fibrous webs preferably takes place in the transition region between the wet part and the dry part.
  • the separation into the partial webs can already take place in the wet part, but due to the closed in the transfer area fibrous web guide on support belts only in the dry zone, especially in the first decrease zone on a drying cylinder actually separated.
  • the separation can take place immediately before the transition to the dry part or already in the press section of the wet section.
  • the inventive method for controlling the transfer or edge strip transfer in a machine for producing fibrous webs, in particular paper, board or tissue webs is characterized in that after a subdivision of the fibrous web into a Koch Kunststoff- or edge strip and a residual web guide the residual web is supported by a stabilizing device and thus forced in the direction of the collecting device. This prevents unwanted residual web entrainment.
  • FIG. 1a shows, in a schematically simplified representation, a detail of a dry part of a machine 2 for producing a fibrous web, in particular a paper, board or tissue web, by way of example a particularly advantageous arrangement of a system 3 according to the invention for spreading the fibrous web 4. This is used in particular when starting the machine and / or during the transfer of a so-called Kochlite- or edge strip after a successful pulp web tear used.
  • the drying section comprises a device 1 for drying a paper, board, tissue or other fibrous web.
  • It can be provided between two drying cylinders 7.1 and 7.2 and arranged between these drying cylinders guide roller 6.1 a guide 8, which forms a vacuum reduction zone 9 on the opposite side of the fibrous side of the support band in the area running from the drying cylinder 7.1 fibrous web.
  • a so-called holding zone 10 connects, in which the fibrous web 4 is guided together with the air-permeable support belt 5 to the guide roller 6.1.
  • the negative pressure decrease zone 9 and the holding zone 10 opposite side walls of the guide 8 are perforated, that is with openings provided and the respective opposite inner spaces of the guide 8 are connected to a vacuum source or are set under negative pressure.
  • the holding zone 10 can be dispensed with the opening of a side wall under certain circumstances.
  • a system 3 for spreading the fibrous web 4 which has a separating device 13 movable transversely to the machine direction and thus transversely to the fibrous web running direction, comprising at least one separating element 14, by means of which the fibrous web 4 is formed into at least two partial webs of the transfer or edge strip 4.1 and a second partial web in the form of the residual web 4.2 - is divided, wherein the separating device 13, in particular the separating element 14, at least between a so-called start and end position is movable, the initial position A, as in the width scheme according to 2, characterized by a position of the separating element 14 relative to the fibrous web 4, in which a transfer or edge strip 4.1 of predefined size, in particular predefined width b 4.1 , can be produced upon exposure of the separating element 14 to the fibrous web 4.
  • the end position E describes the position of the separating element 14 by the method transverse to the fibrous web running direction by the position opposite the fibrous web in the region of the lateral end or outside, ie next to the Fibrous web 4.
  • the system 3 further comprises a stabilizing device 15, which leads to the stabilization and support of the separated fibrous web parts in the form of the non-transferable residual web 4.2 onward into a pulper or other collecting means 16 for fibrous web waste.
  • the stabilization device 15 closes in the machine direction, that is viewed in the fibrous web running direction, to the separator 13, that is, is arranged behind this.
  • separating device 13 and stabilizing device 15 can be combined to form a structural unit depending on the design and transfer location or, as shown in Figure 1, spatially separated, ie viewed in the machine direction spaced from each other.
  • the stabilization device 15 in this case comprises at least one stabilizing element 17, which can be embodied in various ways and serves as a guide device 18 for the separated part of the fibrous web, which passes into the pulper.
  • the stabilizing device 15 is characterized by an effective width W 15 , which serves to support the separated part, in particular the residual web 4.2 considered over the fibrous web width b.
  • FIG. 1a The embodiment of a drying apparatus illustrated in FIG. 1a in the machine 2 for producing fibrous webs adjoins a wet part 19, which comprises a press section 20, wherein the individual presses can be designed differently, depending on the press system used. Different combinations are conceivable.
  • press units can be connected in series, these may be press rolls forming presses or so-called shoe presses characterized in the web direction by an extended press nip by forming one of the press rolls as a shoe press roll.
  • the single stabilizing element 17 can be designed in various ways. Possible embodiments are shown by way of example in FIGS. 3a to 3d and will be explained there.
  • FIG. 1 a clearly illustrates, by way of example, an embodiment with an injector device 21.
  • the injector effect is based on at least one fluid jet F, which consists of gas, water, steam, but preferably air.
  • the generated driving jet can be adjusted.
  • the fluid jet application direction can deviate from the remaining web travel direction. It is crucial that the direction-determining direction component of the effective direction of the motive jet is directed in the desired direction of the residual web 4.2.
  • FIG. 1 b illustrates, on the basis of a view AA in a view from above, the width diagram for the mode of operation of the system 3 according to the invention.
  • the drying cylinders 7. 1 and 7. 2 can be seen in a view from above and the guide roller 6.1.
  • the reproduction of the suction roll 51 has been omitted in this schematic representation.
  • the support band 5 is not shown.
  • Stabilizer 15, which would be obscured by this view, is schematically shown schematically simplified by means of a broken line.
  • the theoretically possible effective width W 15m here corresponds to the width of the residual web 4.2.
  • the arrangement of the separating device 13, in particular of the separating element 14 takes place before the inlet of the fibrous web 4 in the drying cylinder 7.1.
  • the fibrous web 4 Before the separating device, the fibrous web 4 has a width b 4 .
  • the start position which corresponds to the exposure position of the separating element 14 for generating a transfer or edge strip 4.1 relative to the fibrous web width b 4 of the fibrous web 4, is denoted by A and.
  • the separator 13, in particular the separating element 14 can only be moved.
  • the storage is then preferably outside the theoretical fibrous web width b 4 and is denoted by A 0 .
  • the separator 13 is moved to the start position.
  • the action of the separating device 13 on the fibrous web 4 is then carried out directly by contacting a separating element 14 with this or indirectly via the separating element, in particular by contacting a discharged via the separating element 14 separating medium, such as fluid jets or laser.
  • a separating element 14 separating medium
  • the other possibility is to store the separator 13 at A and only the separator 14 depending on the design, for example as a knife relative to the fibrous web 4 in the To move active position, in particular to pivot. In laser or fluid jets, the separator 13 is then activated only.
  • the starting position A relative to the machine width is b M is determined by the desired or predefined width b 4.1 for the edge or transfer strip 4.1.
  • the orientation of the separating device 13 takes place with respect to the fibrous web 4, conceivable is also an orientation relative to a fixed point on the machine 2, in particular the frame.
  • the resulting from the action of the separating element 14 residual strip, ie the residual web is designated 4.2.
  • Whose width b 4.2 corresponds to the difference of the total fibrous web width b 4 with the width b 4.1 of the edge or transfer strip 4.1.
  • the separating device 13 can be moved transversely to the fibrous web running direction or transversely to the machine direction.
  • the movability is preferably carried out by the operator side FS to the drive side TS of the engine 2 from A to E.
  • the end position E1 corresponds to the reaching of the fibrous web width b. 4
  • the separating device 13 is moved beyond b 4 , for example to E0. There it remains or is again moved towards the guide side FS, but without affecting the fibrous web 4 in the storage position.
  • the mobility between A and E is illustrated by an arrow.
  • FIG. 1b further illustrates the continuation of the transfer or edge strip 4.1 through the apparatus 1 for drying the fibrous web 4.
  • the stabilizing device 15 extends here over the residual web width b 4.2 . However, this can also extend over the entire width b 4 of the fibrous web 4, but in its effective width W 15 , this is then preferably to the width b 4.2 of the residual web 4.2, which decreases with changing width ⁇ b 4.1 of the Kochlite- or edge strip , customizable.
  • FIG. 1c illustrates, schematically in simplified form, the arrangement of the stabilization device 15 on the basis of a view BB according to FIG. 1a.
  • the arrangement and illustration of the scraper device 12 according to FIG. 1a has been omitted here.
  • This stabilization device 15 extends here at least over the width b 4.2 of the residual web 4.2, here even beyond.
  • the effective width W 15 of the stabilizing device 15 is preferably variably adjustable, here with ⁇ W 15 specified and decreases with enlargement of the transfer or edge strip 4.1.
  • FIG. 2 illustrates a schematically simplified representation of a possible advantageous embodiment and arrangement of the stabilization device 15 according to FIG. 1c.
  • FIG. 2 illustrates a view B according to FIG. 1a. Visible is the drying cylinder 7.1 and the fibrous web 4, in particular the two already subdivided subregions in the sub-webs 4.1 and 4.2, wherein 4.1 denotes the Kochlite- or edge strips and 4.2 the area, which is transferred as a residual strip in a collecting device 16.
  • the edge strip 4.1 Since the fibrous web 4 must be transferred again at the beginning, that is, after a startup at the start of the machine or after a successful paper web break, the edge strip 4.1 is first transferred to form the transfer or edge strip 4.1 and the web 4.1 is successively enlarged over its width ,
  • the change in the web width ⁇ b 4.1 causes a corresponding change in the web width ⁇ b 4.2 , that is, both result in the sum always the entire fibrous web width, so that decreases at magnification of 4.1 4.2.
  • the stabilizing device 15 is preferably effective only at the area of the fibrous web 4, which is to be guided into the collecting device, that is, the residual web 4.2.
  • the stabilizing device 15 is arranged downstream of the drying cylinder 7.1 in the fibrous web running direction and, based on the desired web continuation of the transfer or edge strip 4.1 and the further increasing transferred web width .DELTA.b 4.1 viewed in the axial direction over the machine length spaced from this, in particular the support belt 5, arranged , The stabilization device 15 is arranged downstream of the vacuum reduction zone 9 in the fibrous web direction.
  • the stabilizing device 15 is immediately downstream of the scraper unit 12, which becomes effective on the outer circumference of the drying cylinder 7.1, ie, free of intermediate spaces.
  • scraper blade and stabilizing device 15 on the same support element or the same support unit 53 stored.
  • the scraper blade allows a deflection of the running direction of the residual web 4.2 in the direction of the collecting device 16, which is held by the stabilizing device 15 in this direction.
  • the theoretically possible effective width W 15m extends over the entire fibrous web width b 4 , but preferably this is adapted to the width ⁇ b 4.2 of the residual web 4.2, so that the stabilizing device 15 is actually effective only in the presence of the residual web 4.2.
  • the stabilizing device 15 causes a force on the residual web 4.2, so that it is deflected by the actual guideway safely into the collecting device 16 is passed.
  • the stabilization device 15 can be designed differently.
  • this comprises at least one injector element 23, preferably a multiplicity of individual injector elements embodied as nozzles 22.1 to 22.n, which generate in their entirety the propulsion jet or the propulsion jet strip generated via the fibrous web width b 4.2 of the residual web 4.2.
  • the individual nozzles 22 are aligned transversely to the fibrous web running direction and arranged side by side.
  • the injector device 21 comprises, in addition to the injector elements 23, at least one connection for coupling to a fluid supply or supply system 24.
  • FIG. 2 also illustrates a device 25 for transferring the transfer or edge strip 4.1. This is arranged on the driver's side FS and is used in the region of the transfer or edge strip width b 4.1 with the smallest width of the safe transfer of this against the support belt. 5
  • FIGS. 3a to 3b Possible embodiments of the stabilization device 15 as an injector device 21 are reproduced by way of example in FIGS. 3a to 3b, via which a fluid jet F or a fluid jet belt F is generated and deployed in the guide direction, preferably parallel to the desired guide direction of the residual web 4.2, or via a corresponding deflection device this direction is steered.
  • FIGS. 3 a and 3 b show only schematic simplified views of the outlet cross sections A 22 of the nozzles 22.
  • the fluid jet may also be oriented differently from the preferred direction parallel to the desired residual web guide direction, in which case, however, at least the direction-determining direction component should be oriented parallel to the desired residual web running direction.
  • the fluid used is water, a liquid-gas mixture, a gas, steam or preferably air. If the injector device 21 is designed such that it comprises an outlet opening 26 in the form of a central outlet slot according to FIG. 3a, this is preferably designed over the machine width b m and thus transversely to the fibrous web running direction with regard to its effective width W 21-max, such that it has the maximum width b 4 of the fibrous web 4, but at least the maximum width b 4.2 of the residual web 4.2 corresponds.
  • the outlet slot 26 is connected to a device for controlling the flow or throughput in the form of valve devices 28 so that in this case, depending on a change in the size of the outlet slot, remaining conditions at the changing outlet slot cross-section ⁇ A 26 can be maintained.
  • equal pressure conditions apply, regardless of whether the residual web 4.2 is wider or narrower.
  • a valve device 28 is further provided, which allows influencing the flow rate of the fluid F.
  • a plurality of individual nozzles 22.1 to 22.n. be arranged here until 22.8 over a theoretical maximum width of the effective range W 15 over the machine width of the machine 2.
  • the individual nozzles can preferably be in a plane according to I or with a slight offset be arranged to each other in the web running direction according to II or forming a network, in which case a nozzle network would be conceivable.
  • FIGS. 3b1-I and 3b1-11 The nozzles shown therein can be controlled individually.
  • each of the nozzles 22 coupled to the fluid supply system 24 via a central supply line 29, between the latter and the individual nozzle 22.1 to 2.n adjusting devices, in particular in the form of at least one valve means 28.1 to 28.n are provided. Furthermore, a direct coupling of the individual nozzles 22.1 to 22.n with the fluid supply system 24 is possible. Other versions are conceivable.
  • the figure 3b1-II illustrates an example with a central supply to all. However, it is also conceivable to address the individual nozzles individually. In this embodiment, theoretically, it is also possible to influence the outlet cross sections A 22 of the nozzles.
  • the individual nozzles 22 can be actuated sectionally, that is to say over a partial region of the effective region 15, here designated W 21-1 to W 21-n , each nozzle 22.1 to 22.6 in each section 30.1 to 30.n, here 30.3 can alone or else all nozzles 22.1 to 22.6 of a section 30.1 to 30.n are controlled jointly.
  • the individual sections 30.1 to 30.3 can be subdivided into subsections 31.1 to 31.3. Each of these subsections 31.1 to 31.3 of a section 30.1 to 30.3 can here be controlled individually via the valve devices 28.1 to 28.3; furthermore, the entire section 30.1 to 30.3 can be actuated separately via the valve devices 32.1 to 32.3.
  • the individual nozzles 22.1 to 22.6 of a section 30.1 to 30.3 can still be controlled separately, the effective area W 15 , which corresponds to the effective area W 21 of the injector device 21, can be influenced both transversely to the residual web 4.2 and in the guide direction. This can be particularly advantageous if the longest possible support of the residual web 4.2 is desired.
  • Each section 30.1 to 30.3 preferably has a central chamber which can be connected to the individual nozzles 22.1 to 22.n, here 22.6 and via which the nozzles 22.1 to 22.6 of a section 30.1 to 30.3 are acted upon.
  • these are further subdivided, in particular in sub-chambers, or else is coupled with sub-chambers, so that the sub-chambers, which are each connected to a part of the nozzles 22.1, 22.2, for example, via mechanical measures, such as slides, can be locked and thus the With these coupled nozzles 22.1, 22.2 are not charged with fluid.
  • the nozzles 22.1 to 22.6 are formed by outlet openings in the wall regions of the chambers.
  • the chambers are connected to a central supply line for the fluid, wherein via respective valve means these individual supply chambers, which form sections in the effective range, are individually switched off.
  • FIG. 3b3 illustrates a schematic representation of an embodiment with a high subdivision rate of the injector device 21 transversely to the residual web movement direction.
  • the device 21 comprises a plurality of sections 30.1 to 30.8, which are individually controllable, each section comprises at least two nozzles 22.1, 22.2.
  • the individual sections 30.1 to 30.8 can also be controlled in groups. Preferably as many sections are provided transversely to the fibrous web running direction. The greater the subdivision into individual sections, the more sensitive the effect of the stabilization device can be adjusted. Furthermore, it is thereby possible that the effective width is reduced approximately synchronously during spreading of the separating element and thus the extension of the residual web.
  • the individual sections are characterized by size ranges preferably in the range between 200 to 500 mm.
  • valve devices are activated and deactivated via the valve devices, but also the fluid jet output via these, in particular with regard to the parameters of the propulsion jet, such as outlet velocity, outlet volumetric flow etc.
  • the valve devices are preferably designed as fine adjustment valves.
  • FIGS. 3 a and 3 b merely illustrate possibilities of designing the stabilizing devices 15. Modifications are possible, in particular with respect to the possibility of configuring the nozzles 22, the outlet cross sections, the outlet cross section geometries and the control.
  • FIGS. 3c and 3d illustrate further embodiments for stabilizing devices 15.
  • FIG. 3c1 illustrates a design of a stabilization device 15 which has at least one foil plate 33 extending over the residual web width, which extends over preferably the entire theoretical maximum effective width W 15max . This is preferably also arranged on the support unit 53 for the scraper device 12 and is made slightly inclined relative to the desired residual web travel direction. As a result of drag air, a negative pressure is formed between the residual web 4.2 and the foil plate 33, in particular the surface 34 of the foil plate 33 facing the residual web 4.2. A deactivation of the mode of action takes place by pivoting away, indicated here by a double arrow.
  • the foil plate 33 can extend as a rigid element over the entire width b 4 of the fibrous web 4 or at least the theoretically maximum possible width b 4.2 of the residual web 4.2. However, it is also conceivable to form these from a plurality of partial plates, which extend side by side transversely to the residual web running direction, wherein the individual partial plates can be deactivated by pivoting. According to a particularly advantageous further development in FIG. 3c2, the foil plate 33 is additionally evacuated. For this purpose, a suction device 35 is assigned. This can form a suction zone 36 over the effective width W 15 or be characterized by a plurality of juxtaposed Operaaugzonen 36.1 to 36.n, which are individually and / or in groups or jointly controllable. With regard to the possibilities of controlling the suction zones, reference is made to the comments on FIG. 3d in order to avoid repetition.
  • Figure 3d1 illustrates an embodiment of the stabilizing element 15 in the form of a so-called open roll 37, which may be additionally or optionally evacuated.
  • this has a stationary suction zone 38.
  • the suction zone 38 is directed towards the guide direction of the residual web 4.2 and extends over a part of this over the outer circumference of the open roller 37, which comprises an air-permeable, for example, perforated jacket 39.
  • a stationary suction element with a curved support surface can also be provided.
  • suction zones 36 and 38 there are a variety of possibilities.
  • the statements on the controllability according to Figure 3a to 3b apply analogously also for the suction zones 36, 38.
  • the individual suction zone 36 and 38 may be formed over the entire effective width. In this case, the suction zone can be successively influenced by covering or reducing in size.
  • each suction zone 36 or 38 is subdivided into individual suction zone sections 40.1 to 40.n. These extend next to each other over each part of the effective range W 15th According to FIG. 3d2, the sections can be controlled individually via corresponding actuators 41.1 to 41.n or additionally or optionally in groups according to FIG. 3d3.
  • a device 43 for controlling the system 3 for spreading a fibrous material web is shown schematically in simplified form.
  • This device comprises a device 44 for detecting at least one, a web tear at least indirectly characterizing size, means 46 for detecting the fibrous web width of the partial web 4.1 at a position 2, which is disposed behind the separation point of the pulp webs, a means 45 for detecting a width of the Residual web 4.2 in the area of the stabilization device 15 at least indirectly characterizing size, preferably for direct detection, a control device 47, which processes the variables and actuators 48 for controlling the separator 13 and 49 of the stabilizing device 15 for setting the effective width W 15th
  • the device for detecting a residual web width 4.2 at least indirectly characterizing size may be a device for detecting the fibrous web width of the residual web 4.2 or the width of the Koch Kunststoff- or edge strip 4.1 before entering the stabilizer 15 act, in which case the inertia of the control is taken into account, especially in high-performance machines of particular importance.
  • sensors are used as detection devices, which are designed as optical sensors and send a cover when covered by the fibrous web a corresponding signal.
  • a manipulated variable for controlling the adjusting devices 48 and 49 are output, in particular for activating the separating device 13 and for setting the effective range W 15 and the actuating devices driven, that is, depending on the design of the stabilizing device as injector or suction device with leadership function, for example Suction roll or curved vacuum cleaner, issued.
  • the individual nozzles or the individual sections are then controlled in a corresponding manner.
  • the method is reproduced on the basis of a signal flow diagram in FIG. Accordingly, after detecting a web break by the device 44 within the machine, in particular in the dry part, a signal to the controller 47 is passed, in which a manipulated variable for driving, in particular activation of the separator 14 is generated. This is output to the adjusting device 48 and the separator 14 is activated, so that the fibrous web 4 is divided into at least two partial webs 4.1 and 4.2. At the same time, at least one variable which at least indirectly characterizes the width of the residual web 4.2 in the region of the stabilization device 15 is determined via a detection device 45.
  • the effective range is determined at the stabilizer 15 and a manipulated variable Y15 for controlling the actuator 49 to Setting the effective range, in particular the effective width W 15 generated at the stabilization device and output. If the transfer or edge strip 4.1 has the full fibrous web width at a position 2 which lies behind the introduction of the residual web 4.2 into the receiving device 16, the stabilizing device 15 can be deactivated. A deactivation depending on the reaching of the end position of the separating element 14 taking into account the fibrous web speed is also conceivable.
  • the detection devices are preferably sensors, in particular optical sensors.
  • the solution according to the invention is preferably used in a device for drying fibrous webs, the stabilizing unit being arranged immediately after the first drying cylinder.
  • the arrangement is carried out below the axis of rotation of the drying cylinder in the export area of the fibrous web 4 and behind the vacuum reduction zone to the support belt. 5
  • FIG. 6 illustrates an advantageous further development of an embodiment with a further second injector device 52 arranged downstream of the scraper device 12 and the stabilization device 15.
  • This comprises at least one spray tube 55 which extends over the entire machine width and preferably has only one zone with a feed line, so that the Effect over the entire fibrous web width, in particular residual web width 4.2 is ensured without considerable additional effort with certainty.
  • the second injector device 54 is arranged below the scraper-carrying body, ie the carrying unit 53. This prevents by the directed delivery of a fluid jet, that the residual web 4.2 and / or the entire fibrous web are entrained with the stabilizing device 15. The arrangement takes place in the shadow of the scraper unit 12.
  • the exit beam is aligned at least parallel to the desired residual web guiding direction or at a slight angle relative thereto.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
EP07111929A 2006-09-22 2007-07-06 Système pour élargir une bande fibreuse, procédé de controller le transfert de la bande directrice et machine pour la fabrication d'une bande fibreuse Not-in-force EP1903142B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006044930A DE102006044930A1 (de) 2006-09-22 2006-09-22 System zum Breitfahren einer Faserstoffbahn, Verfahren zur Steuerung der Überführ- bzw. Randstreifenüberführung und Maschine zur Herstellung einer Faserstoffbahn

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EP1903142A1 true EP1903142A1 (fr) 2008-03-26
EP1903142B1 EP1903142B1 (fr) 2011-04-27

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EP (1) EP1903142B1 (fr)
CN (1) CN101148838B (fr)
AT (1) ATE507347T1 (fr)
DE (2) DE102006044930A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP2058433A3 (fr) * 2007-11-10 2010-05-05 Andritz Küsters GmbH Dispositif de transfert d'une bande de matériau flexible, en particulier une bande de papier ou de carton

Families Citing this family (6)

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Publication number Priority date Publication date Assignee Title
DE102008040032A1 (de) * 2008-06-30 2009-12-31 Voith Patent Gmbh Leistenanordnung für eine Maschine zur Herstellung einer Faserstoffbahn
US20100213305A1 (en) * 2009-02-26 2010-08-26 Andritz Inc. Apparatus and method for stabilizing a moving web
CN101967768B (zh) * 2010-11-01 2013-06-26 东莞理文造纸厂有限公司 一种造纸机控制方法
CN102517957A (zh) * 2011-12-19 2012-06-27 中冶美利纸业股份有限公司 回头辊纸张裁切装置
CN110835793B (zh) * 2019-12-03 2021-01-26 滕州永喜无纺布有限公司 一种条卷机的扩幅装置
DE102019134691A1 (de) * 2019-12-17 2020-11-19 Voith Patent Gmbh Vorrichtung und Verfahren zum Überführen einer Faserstoffbahn

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DE3314726A1 (de) * 1982-04-27 1983-10-27 Valmet Oy, 00130 Helsinki Verfahren und vorrichtung zum schneiden des endfuehrungsbandes einer papierbahn
DE10315703A1 (de) * 2003-04-07 2004-10-21 Voith Paper Patent Gmbh Wasserstrahlschneiden
EP1640497A2 (fr) * 2004-09-27 2006-03-29 Voith Paper Patent GmbH Dispositif et procédé de surveillance de rupture de bande pendant le transfert d'une bande de matériau, en particulier pendant l'élargissement d'une bande d'enfilement découpée dans ladite bande
DE102004048157A1 (de) * 2004-10-02 2006-04-06 Voith Paper Patent Gmbh Trocknungsvorrichtung

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DE3314726A1 (de) * 1982-04-27 1983-10-27 Valmet Oy, 00130 Helsinki Verfahren und vorrichtung zum schneiden des endfuehrungsbandes einer papierbahn
DE10315703A1 (de) * 2003-04-07 2004-10-21 Voith Paper Patent Gmbh Wasserstrahlschneiden
EP1640497A2 (fr) * 2004-09-27 2006-03-29 Voith Paper Patent GmbH Dispositif et procédé de surveillance de rupture de bande pendant le transfert d'une bande de matériau, en particulier pendant l'élargissement d'une bande d'enfilement découpée dans ladite bande
DE102004048157A1 (de) * 2004-10-02 2006-04-06 Voith Paper Patent Gmbh Trocknungsvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2058433A3 (fr) * 2007-11-10 2010-05-05 Andritz Küsters GmbH Dispositif de transfert d'une bande de matériau flexible, en particulier une bande de papier ou de carton

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DE102006044930A1 (de) 2008-04-03
CN101148838B (zh) 2012-11-21
DE502007007045D1 (de) 2011-06-09
ATE507347T1 (de) 2011-05-15
CN101148838A (zh) 2008-03-26
EP1903142B1 (fr) 2011-04-27

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