EP1903142B1 - System for widening a fibre web, method for controlling the transfer of a web tail and machine for producing a sheet of fibrous material - Google Patents

Abstract

One or more stabilization units (15), stabilize the web remaining (4.2), between the initial position (A) and the end position (E) of the cutter unit, seen across the machine direction. Cutter and stabilizer (15) are arranged separately in succession along the machine. The operating width of the stabilizer extends across the entire width of the remaining web, corresponding with the operational width of the cutter between start and end positions. It alternatively extends over the entire web width. The stabilizer operational width is adjustable. At least one cutter is included, its initial position (A) corresponding with the desired width of the transfer- or edge strip (4.1) at the side of the web. A dual cutting arrangement is described. The stabilizer has adjacent, individually-controlled components, disposed across the machine. The stabilizer includes film panels adjustable through an angle in relation to the direction of travel of the web remaining. They are swung by an adjuster unit. A suction unit and suction zone are associated with each film panel. In variant designs, the stabilizer comprises suction rollers, or injectors producing flow. Various controls and adjustments control the application, magnitude and/or direction of the suction and flow. The flow is provided by a fluid jet, the fluid being e.g. water, gas, gas fluid mixture, steam or air. The cutter is a fluid jet. It is alternatively a blade. A unit (25) supports strip transfer. Further mechanical details are provided. The equipment forms part of a papermaking machine with a wet section, drying section and system for controlling web width as described. The cutter is in the wet section or at the start of the drying section, and the stabilizer is in the drying section. An independent claim IS INCLUDED FOR the corresponding method of manufacture.

Description

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 Überführ- or edge strip transfer and a machine for producing fibrous webs with such a system.

Machines for producing fibrous webs, in particular in the form of paper, board or tissue 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 Faserstoffbahnführungsweges at least one fibrous web treatment device. When starting the machine at the start of production and when restarting after a successful shutdown of the machine for the production and / or treatment of a fibrous web usually 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. For the formation or separation of the so-called 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 Streifenabschlagvorrichtungen, 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. At high machine speeds, the requirements for ensuring an accurate web guide are very high. The transfer strips are forced by vacuum into the desired position, so that they are continued on the guide elements, while the residual web generally slides downwards.

In order to ensure an exact web guide for the transfer or edge strip even at very high machine speeds, a variety of measures are known. These are in the pamphlets EP 1 640 497 A2 and DE 10 2004 048 157 A1 described.

According to DE 10 2004 048 157 A1 The device for drying a paper web in which the fibrous web is guided meandering alternately via guide rolls and heated drying cylinders together with an air-permeable support belt, a guide device which has a vacuum reduction zone in the region of the running away from the drying cylinder fibrous web, on the opposite side of the fibrous web Support band is formed. 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.

The document DE 103 15 703 A1 discloses a method and apparatus for cutting a paper, board, tissue or other fibrous web in a machine for making and / or finishing the same with at least one jet of water, the fibrous web being guided by an air-permeable, endlessly circulating wire. In this case, wear and contamination of the screen are to be reduced by the fact that the fibrous web is lifted in the region of the impinging on them water jet with the aid of a pressurized fluid from the screen.

The document DE 33 14 726 A1 describes a method and apparatus for cutting an end guide web of a paper web in an unsupported train. In this case, in the region of the cutting device, a support surface adapted in the direction of the plane of the passing web is provided for stabilizing the path of the web during the cutting process.

A device for detecting a tear of a web and thus the required Wiederüberführens is off EP 1 640 497 A2 previously known. The device for detecting the tear is intended and designed to respond during the transfer of the material web, in particular during the increase in the width of the transfer strip, on a demolition of the transfer strip or the material web. 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 described solutions, in particular the last one, serve for the detection of breaks and the new presentation of the transfer or edge strip. However, problems caused by an unpredictable entrainment of the residual strip are thus not controllable; in particular, in the case of fast-running machines when the fibrous web is being extended, the residual web sometimes entrains the first stabilizer roll. As a result, there is a margin error, with the further transport of the train to the complete loss of track to the next Drying cylinders can lead. This usually also leads to longer downtimes and thus production downtime.

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.

The solution according to the invention is characterized by the features of claims 1, 31 and 34. Advantageous embodiments are given in the subclaims.

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. According to the invention, a stabilization device for stabilizing the residual web is provided for controlling the transfer operation and thus 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.

The terms "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. Depending on the desired starting position of the Überführ- or edge strip fundamentally at least two options are distinguished. This includes the lateral position of the edge strip, i. the edge strip is formed by a lateral end portion of the fibrous web. In this case, 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. In this case, 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. Preferably, however, 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.

Another possibility is to produce the transfer strip not at the edge but within the width of the fibrous web, ie substantially in the middle or slightly offset. In this case, 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 Anfangsüberführstreifenbreite. 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. Thus, this solution can also be used in installation situations with little space.

The choice of the separation system used is not limited. As a separation device or separating elements, the known systems can be used. In the simplest case, 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.

1. a) einander überlappen oder aber
2. b) räumlich getrennt voneinander

vorgesehen werden.For the arrangement of separator and stabilizer to each other a plurality of possibilities. These are connected in series in the system in terms of their functional arrangement. It can depending on the desired possibility of leadership to catch or Processing device considered the effective ranges of separating element and stabilizer in the machine direction

1. a) overlap one another or else
2. b) spatially separated from each other

be provided.

In the case a), a stabilization and deflection of the running direction of the residual web of the fibrous web takes place already during the separation in the separating region. However, this design makes high demands on the continuation of the edge strip and the resulting fibrous web.

In spatially successively connected arrangement, these spatially close to each other, but also be arranged spatially separated from each other. In this case, 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. In this case, for example in embodiments of 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. In order to be independent of the travel width of the separating device, and furthermore to support only the actual residual web, the stabilizing device can also extend over the entire fibrous web width, wherein the effective range should then be adjustable in any case. In order to always ensure full support of the residual web, the effective range of the stabilizing device is preferably infinitely adjustable, in particular adaptable to the width of the residual web.

There are a number of possibilities for the design of the stabilization device. This comprises at least one stabilizing element, which can be designed in many forms. In the simplest case, 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. In this case, in the guide direction of the residual web between this and the foil plate, 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. In order to achieve only partial activation or deactivation of the effect of the foil plate, this can be divided into several subzones. According to a particularly advantageous embodiment, the foil plate can also consist of a plurality of individual Foilplattenelementen 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 Foilplattenelemente. Furthermore, the foil plate or the individual foil plate elements can also be displaced counter to the machine direction.

According to a further development, 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 Teilaugzonen be characterized. To realize a nearly stepless adjustment, the suction device has a plurality of transversely juxtaposed to the fibrous web running direction suction zones, 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. For this purpose, 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. In the latter case, the suction zones are divided into sections. The subdivision can be done arbitrarily. Preferably, 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. Preferably, the suction power can be varied locally within a section. The sections can also be activated or deactivated individually or in groups. Depending on the design of the section width and the activability, in particular controllability of the individual zones, a nearly optimal adaptation to the changing width of the residual web can thus also be made over a certain machine width. Also, such devices can be used regardless of the type of Überführstreifenerzeugung - as a central strip or edge strips - since the central zones can be easily deactivated. Furthermore, an independence of the applicability of such facilities in terms of the fibrous web width is given within certain limits.

Another particularly advantageous embodiment consists in the execution of the stabilization device as injector. In this case, 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.

In this case, 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. As fluids find gas, water, steam or preferably air, which is present anyway, use. In this case, 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.

On the concrete constructive implementation of the possibilities of individual or group-wise control of the individual suction or injector zones will not be discussed in detail. Decisive is the realization of the basic principle of almost continuous adjustment of the effective width of the stabilizing element to the width of the residual web, which inevitably changes with the width increase of the transfer strip, in particular reduced.

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. In this case, 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. Other possibilities are conceivable. Thus, 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, cardboard or tissue webs, is characterized in that after a subdivision of the fibrous web into a Überführ- 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.

Figur 1a

verdeutlicht in schematisiert vereinfachter Darstellung anhand eines Ausschnittes aus einer Maschine zur Herstellung von Faserstoffbahnen, insbesondere den Übergang zwischen Nassteil und Trockenteil, insbesondere einer Pressenpartie zu einer Trockenpartie die Anordnung eines erfindungsgemäßen Systems zum Breitfahren einer Faserstoffbahn;

Figur 1b

verdeutlicht anhand einer Ausführung gemäß Figur 1, insbesondere einer Ansicht A-A das Breitenschema für den Wirkbereich der Trenneinrichtung des erfindungsgemäßen Systems;

Figur 1c

verdeutlicht anhand einer Ansicht B gemäß Figur 1a das Breitenschema für den Wirkbereich der Trenneinrichtung des erfindungsgemäßen Systems;

Figur 2

verdeutlichte eine vorteilhafte Ausführung gemäß Figur 1c;

Figuren 3a bis 3b

verdeutlichen beispielhaft Ausführungen einer Injektoreinrichtung;

Figur 3c

verdeutlicht eine Ausführung einer Stabilisierungseinrichtung, umfassend eine Foilplatte;

Figur 3d

verdeutlicht eine Ausführung einer Stabilisierungseinrichtung, umfassend eine Saugwalze;

Figur 4

verdeutlicht eine Steuervorrichtung zur Steuerung des Systems zum Breitfahren der Faserstoffbahn;

Figur 5

verdeutlicht anhand eines Signalflussbildes ein Verfahren zur Steuerung der Breitführung einer Faserstoffbahn;

Figur 6

verdeutlicht eine Ausführung mit einem der Stabilisierungseinrichtungnachgeordneten Spritzrohr.

The stabilizer effective area is preferably adjustable depending on the width of the residual web, so that only the area actually to be stabilized is supported. If a web break is detected, a separating device for subdividing the fibrous web into at least two partial webs - a transfer or edge strip and a residual web is activated, wherein at least one of the width of the resulting residual web at least indirectly characterizing size is detected and determines the residual web width in the stabilizer and depending on this, the effective width of the stabilization device is set. Upon detection of reaching the full web width by the transfer strip, the stabilizer, if not already done, is deactivated. With this method, it is thus possible to react very quickly to web breaks and to achieve a reliable trouble-free re-launching of the fibrous web in a short time.
The solution according to the invention is explained below with reference to figures. The following is shown in detail:

FIG. 1a

illustrates in a schematic simplified representation of a section of a machine for the production of fibrous webs, in particular the transition between wet and dry part, in particular a press section to a dryer section, the arrangement of a system according to the invention for spreading a fibrous web;

FIG. 1b

illustrated by an embodiment according to FIG. 1 , in particular a view AA the width scheme for the effective range of the separator of the system according to the invention;

Figure 1c

illustrated by a view B according to FIG. 1a the width scheme for the effective range of the separator of the system according to the invention;

FIG. 2

clarified an advantageous embodiment according to Figure 1c ;

FIGS. 3a to 3b

exemplify embodiments of an injector;

Figure 3c

illustrates an embodiment of a stabilization device comprising a foil plate;

3d figure

illustrates an embodiment of a stabilizing device comprising a suction roll;

FIG. 4

illustrates a control device for controlling the system for spreading the fibrous web;

FIG. 5

illustrates a method for controlling the width guidance of a fibrous web on the basis of a signal flow diagram;

FIG. 6

illustrates an embodiment with a stabilizer downstream spray tube.

Maschinenrichtung

Arbeitsrichtung beziehungsweise Durchlaufrichtung der Faserstoffbahn bzw. Länge der Maschine

Triebseite

Seite der Maschine, an welcher die Antriebsaggregate angeordnet sind

Führerseite

Zugangsseite

Wirkbreite

Wirkungsbereich in Breitenrichtung der Maschine, d.h. quer zur Faserstoffbahnlaufrichtung

Before explaining the figures, the following definitions are prefixed:

machine direction

Working direction or direction of passage of the fibrous web or length of the machine

drive side

Side of the machine on which the drive units are arranged

tender side

access page

effective width

Effective range in the width direction of the machine, ie transversely to the fibrous web running direction

The FIG. 1a illustrates in a schematic simplified representation of a section of a dry part of a machine 2 for producing a fibrous web, in particular a paper, board, or tissue web, for example, a particularly advantageous arrangement of a system according to the invention 3 for spreading the fibrous web 4. This comes in particular when starting the machine and / or in the transfer of a so-called Überführ- or edge strip after a successful pulp web tear for use. The drying section comprises a device 1 for drying a paper, board, tissue or other fibrous web. In this, the fibrous web 4 with an air-permeable support belt 5, in particular drying wire meandering alternately via guide rollers 6, here exemplified 6.1 to 6.3 and heated drying cylinder 7, here example 7.1 to 7.3, out, the fibrous web 4 with the drying cylinders 7 in direct contact occurs. 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. At the vacuum reduction zone 9, 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. For this purpose, 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. In the holding zone 10 can be dispensed with the opening of a side wall under certain circumstances. When transferring the fibrous web 4, in which first a so-called insertion strip or edge strip of the fibrous web 4 is to be continued on the support belt 5, an adaptation of the vacuum reduction zone 9 to the width of the lead-in strip is very important. This is to prevent parts or all of the remaining fibrous web 4, which continues on the drying cylinder, here the drying cylinder 7.1, and which is employed by a cleaning device 11, in particular a doctoring device 12, whose effective area is set at an angle to the outer circumference of the drying cylinder 7.1. be removed, get to the support band 5 and thus endanger the transfer process. However, in fast-running machines for the production and / or finishing of fibrous webs 4, the fibrous web 4, in particular of the transfer strip 4.1 on the support belt 5, often still entrains the first guide roller 6.1. The result is a margin error, which tears during further transport of the fibrous web 4 and can lead to complete fibrous web loss. According to the invention, a system 3 for spreading the fibrous web 4 is provided, 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 FIG. 2 is characterized by a position of the separating element 14 relative to the fibrous web 4, in which a transfer or edge strip 4.1 predefined size, in particular predefined width b _4.1 , 14 can be generated upon exposure of the separating element 14 on the fibrous web. 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. In this case, separating device 13 and stabilizing device 15 can be summarized depending on the design and transfer location to a structural unit or are, as in FIG. 1 shown, 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.

The in the FIG. 1a illustrated embodiment of a drying device joins in the machine 2 for the production of fibrous webs to a wet part 19, which includes a press section 20, wherein the individual presses can be designed differently, depending on the press system used. Different combinations are conceivable. Several 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. At the end of the press section 19, the removal and transfer of the fibrous web 4 and the fibrous web parts 4.1 and 4.2, which are guided on an endless circulating belt 50, which is guided by corresponding drive and guide rollers 52, and to the support belt 5 of the dryer section by means For example, a Saugabnahmewalze 51 are passed.

The single stabilizing element 17 can be designed in various ways. Possible embodiments are exemplary in the FIGS. 3a to 3d reproduced and will be explained there. FIG. 1a illustrates an example of a highly schematic embodiment with an injector 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. 1b illustrated by a view AA in a view from above the width scheme for the operation of the system according to the invention 3. Visible are the drying cylinders 7.1 and 7.2 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. Furthermore, to illustrate the fibrous web 4, 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. 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. In this, 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 . When desired generation of a transfer or edge strip 4.1, 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. 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. For gradual, preferably uniform widening of the transfer or edge strip 4.1 up to complete web width b ₄ , 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. Here, the end position E1 corresponds to the reaching of the fibrous web width b. ₄ Preferably, however, 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 clarifies the continuation of the transfer or edge strip 4.1 through the device 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 Δ b _{4.1 of} the Überführ- or edge strip , customizable.

Figure 1c illustrated schematically simplified by a view BB according to FIG. 1a the arrangement of the stabilizing device 15. On the arrangement and representation of the scraper 12 according to FIG. 1a was 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 ΔW 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 Figure 1c , The 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 Überführ- or edge strips and 4.2 the area, which is transferred as a residual strip in a collecting device 16. 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 Δb _4.1 causes a corresponding change in the web width Δb _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. This is intended to prevent this partial web from being able to wind around the drying cylinder 7.1 and, moreover, in particular when the residual web width b _{4.2 is} reduced, this region is removed in the vacuum reduction zone 9 and carried onward. 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. Preferably, 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. According to a particularly advantageous embodiment, 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 Δ 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. In embodiments as an injector device 21, 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. For this purpose, 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 further illustrates a device 25 for transferring the Überführ- 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

Possible embodiments of the stabilization device 15 as injector device 21 are exemplary in the FIGS. 3a to 3b reproduced, via which a fluid jet F or a fluid jet belt F in the guide direction, preferably parallel to the desired guide direction of the residual web 4.2, is generated and discharged or is directed via a corresponding deflection in this direction. The FIGS. 3a and 3b illustrate only schematic simplified views of the outlet cross sections A _{22 of} the nozzles 22nd

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 has an outlet opening 26 in the form of a central outlet slot according to FIG FIG. 3a this is preferably over the machine width b _m and thus transverse to the fibrous web running direction with respect to its effective width W _21-max designed such that it corresponds to 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. The adaptation to the fibrous web width, in particular the changing width .DELTA.b _{4.2 of} the residual web 4.2, takes place by closing or reducing the size of the central exit slit 26 in the width direction, for example via a slide element 27, which reduces the exit opening 26 in accordance with its position. Furthermore, 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 ΔA ₂₆ can be maintained. In particular over the residual web width b _4.2 equal pressure conditions apply, regardless of whether the residual web 4.2 is wider or narrower.

To control the action of the propulsion jet, it is controlled as a function of a section A ₂₂ of the nozzle 22, the velocity of the fluid and the exit gap geometry. Preferably, a valve device 28 is further provided, which allows influencing the flow rate of the fluid F.

It can according to FIG. 3b1 , 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. These individual possibilities are theoretically in the Figure 3b1-I and 3b1-11 played. The nozzles shown therein can be controlled individually. In this case, as in Figure 3b1-I reproduced, each of the nozzles 22 coupled to the fluid supply system 24 via a central supply line 29, wherein 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 exemplifies a version with central feed 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.

According to FIG. 3b2 For example, the individual nozzles 22 can be actuated sectionally, that is to say over a partial area of the effective area 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 be used 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. If in addition, but not shown here, 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. In addition, can 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. In the simplest case, the nozzles 22.1 to 22.6 are formed by outlet openings in the wall regions of the chambers. Preferably, 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 high subdivision rate of the injector 21 transverse to the residual web movement direction. As a result, the size of the effective range W ₁₅ , corresponding to W ₂₁ , can be controlled very sensitively. 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.

In particular, in the FIGS. 3a and 3b As shown, it is possible to adjust the effective range W ₁₅ to the actual required residual web widths, the adjustment being as accurate as possible. Not only the individual sections, subsections or even individual nozzles 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.

The FIGS. 3a and 3b Only modifications of the design of the stabilizing devices 15 are illustrated here. Modifications are possible, in particular with respect to the possibility of designing the nozzles 22, the outlet cross sections, the outlet cross section geometries and the control.

The Figures 3c and 3d clarify further explanations for stabilizers 15. Figure 3c1 illustrates an embodiment of a stabilizer 15, which has at least one over the residual web width extending foil plate 33 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 Figure 3c2 are, the foil plate 33 additionally sucked. 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 Teilaugzonen 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 is on the comments too 3d figure directed 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. In this case, this has a stationary suction zone 38. This is also arranged behind the scraper. 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.

By analogy with the suction roll, which is rotatable, a stationary suction element with a curved support surface can also be provided.

With regard to the control of the suction zones 36 and 38 there are a variety of possibilities. The explanations to the controllability according to Figure 3a to 3b By analogy, this also applies to the suction zones 36, 38. The individual suction zone 36 or 38 can be formed over the entire effective width. In this case, the suction zone can be successively influenced by covering or reducing in size.

Preferably, 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 The sections can according to Figure 3d2 individually controlled via corresponding actuators 41.1 to 41.n or additionally or optionally in groups according to Figure 3d3 ,

According to FIG. 4 schematically shows a simplified device 43 for controlling the system 3 for spreading a fibrous web. 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 In 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 Überführ- 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. Furthermore, it is conceivable to detect the actual size of the width of the pulp web 4.2 at a certain distance before entering the effective range W _{18 of} the stabilizing element 15 and to deduce the actual size taking into account the belt speed of the machine running speed. Any possibility is conceivable. In the simplest case 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. Depending on the detected variables, 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. In this case, either the individual nozzles or the individual sections are then controlled in a corresponding manner.

The method is based on a signal flow diagram in FIG. 5 played. 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. It can be determined either directly or across the width of the transfer or edge strip 4.1 at a position 1, ie before separation from the residual web or the position of the separating element 14. From the present in the stabilization region of the device 15 width of the residual web 4.2, 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 development of an embodiment with a scraper device 12 and the stabilizing device 15 downstream further second injector 54. This includes 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 on the entire fibrous web width, in particular residual web width 4.2 without significant additional effort is guaranteed 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.

LIST OF REFERENCE NUMBERS

1

Device for drying

2

Machine for the production of fibrous webs

3

System for spreading a fibrous web

4

Fibrous web

4.1 1

first partial web, transfer or edge strip

4.2

residual web

5

breathable support band

6

guide roll

7

drying cylinders

8th

guide

9

Vacuum pick-up zone

10

holding zone

11

cleaning device

12

scraper unit

13

separator

14

separating element

15

stabilizing device

16

catcher

17

stabilizing element

18

guide means

19

wet part

20

press section

21

injector

22

jet

22.122.n

jet

23

injector element

24

Fluid supply or supply system

25

Device for transferring the transfer or edge strip

26

Outlet opening, slot

27

slide element

28.1 to 28.n

valve means

29

supply line

30.1 to 30.3

sections

31.1 to 31.3

subsection

32

valve means

33

Foilplatte

34

Foilfläche

35

suction

36

suction zone

37

suction roll

38

suction zone

39

coat

40.1 -40.n

sections

41.1 - 41.n

actuators

42.1-42.3

valve devices

43

control device

44

Device for recording

45

Device for recording

46

Device for recording

47

control device

48

setting device

49

setting device

50

tape

51

suction roll

52

guide roll

53

support unit

54

second injector unit

55

spray wand

Claims (36)

1. System (3) for widening fibrous webs in machines (2) for producing fibrous webs (4), in particular paper, board or tissue webs, comprising at least one dividing device (13), which can be moved transversely with respect to the machine direction between a starting position (A) and an end position (E), to subdivide the fibrous web (4) into at least two part webs (4.1, 4.2), specifically into a first part web (4.1) in the form of a guide path, such as a transfer strip or web tail for transfer to further fibrous web handling devices, and into a second, remaining web (4.2) to be led onward to a collecting and/or preparation device (16),
   characterized in that
   at least one stabilizing device (15) is provided in order to deflect the remaining web (4.2) away from the actual guide path and to lead it onward to the collecting and/or preparation device and to stabilize the remaining web (4.2) between the starting position (A) and the end position (E) of the individual dividing device (13), viewed transversely with respect to the machine direction.
2. System (3) according to Claim 1, characterized in that
   the dividing device (13) and the stabilizing device (15) are arranged one after the other in the machine direction.
3. System (3) according to either of Claims 1 and 2,
   characterized in that
   the dividing device (13) and the stabilizing device (15) are arranged physically separately from each other in the machine direction.
4. System (3) according to one of Claims 1 to 3,
   characterized in that
   the effective width (W₁₅) of the stabilizing device (15) extends over part, preferably the whole, of the remaining web width (4.2) which corresponds to the width of the travel of the dividing device (13) between starting position (A) and end position (E).
5. System (3) according to Claim 4, characterized in that
   the stabilizing device (15) extends over the entire width (b₄) of the fibrous web (4).
6. System (3) according to one of Claims 1 to 5,
   characterized in that
   the effective width (W₁₅) of the stabilizing device (15) transversely with respect to the machine direction can be adjusted variably.
7. System (3) according to one of Claims 1 to 6,
   characterized in that
   the dividing device (13) comprises at least one dividing element (14), the starting position (A) of which is arranged at a distance from the lateral edge of the fibrous web (4) which corresponds to the desired width of the transfer strip or web tail (4.1).
8. System (3) according to one of Claims 1 to 6,
   characterized in that
   the dividing device (13) comprises at least two dividing elements (14), the starting positions (A) of which are arranged adjacent to one another or at a distance from one another and in each case at a distance from the lateral edge of the fibrous web (4).
9. System (3) according to one of Claims 1 to 8,
   characterized in that
   the stabilizing device (15) comprises at least one stabilizing element (17) or a plurality of stabilizing elements (17) arranged adjacent to one another transversely with respect to the machine direction.
10. System (3) according to Claim 9, characterized in that
    the individual stabilizing elements (17) can be actuated individually.
11. System (3) according to one of Claims 1 to 10,
    characterized in that
    the stabilizing device (15) comprises at least one stationary foil plate (33) or a plurality of foil plates (33) arranged beside one another transversely with respect to the machine direction which, viewed in the remaining web guide direction, can be set at a angle to the remaining web guide direction and counter to the latter.
12. System (3) according to Claim 11, characterized in that
    the foil plate (33) is assigned a device for pivoting the foil plate (33).
13. System (3) according to Claim 11 or 12,
    characterized in that
    the stabilizing device (15) comprises a suction device (35), comprising at least one suction zone (36) for applying suction, assigned to the foil plate (33).
14. System (3) according to one of Claims 1 to 10,
    characterized in that
    the stabilizing device (15) comprises at least one roll (37) to which suction can be applied, comprising at least one stationary suction zone (38) which is formed along the desired guide direction for the remaining web (4.2) and for a perforated shell (19) that can be moved with respect to the said roll.
15. System (3) according to Claim 13 or 14,
    characterized in that
    the width of the suction zone (36, 38) transversely with respect to the machine direction can be adjusted variably.
16. System (3) according to Claim 15, characterized in that
    the size, in particular width, of the individual suction zone (36, 38) can be adjusted continuously.
17. System (3) according to one of Claims 13 to 16,
    characterized in that
    the suction zone (36, 38) comprises a plurality of suction zone sections (40.1 to 40.n) formed beside one another transversely with respect to the machine direction, which can be activated and deactivated individually and/or in groups and/or jointly.
18. System (3) according to one of Claims 13 to 17,
    characterized in that
    the suction zone (36, 38) and/or the suction zone sections (40.1 to 40.n) is/are assigned at least one device for the application of a negative pressure, and the magnitude of the negative pressure in the suction zone (36, 38) or the suction zone sections (40.1 to 40.n) is adjustable.
19. System (3) according to one of Claims 1 to 10,
    characterized in that
    the stabilizing device (15) comprises an injector device (21) for the application of a fluid (F) to produce a propulsion jet having at least one directional component parallel to the guidance of the remaining web (4.2).
20. System (3) according to Claim 19, characterized in that
    the injector device (21) comprises at least one injector element (23) or a plurality of individual injector elements (23), to which at least one device for controlling and/or regulating the variables describing the fluid jet is assigned.
21. System (3) according to either of Claims 19 and 20, characterized in that
    the effective width (W₂₁) of the injector device (21) can be adjusted continuously over the machine width.
22. System (3) according to one of Claims 19 to 21,
    characterized in that
    the injector device (21) has at least two sections (30.1 to 30.3) arranged adjacent to one another transversely with respect to the machine direction, comprising one injector element (23) or a plurality of injector elements (23), which can be connected and disconnected and/or controlled individually and/or in groups.
23. System (3) according to Claim 22, characterized in that
    the individual injector elements (23) of a section (30.1 to 30.3) can be actuated individually or in groups.
24. System (3) according to one of Claims 20 to 23,
    characterized in that
    the injector elements (23) are implemented as nozzles (22).
25. System (3) according to one of Claims 19 to 24,
    characterized in that
    the fluid used is a liquid, in particular water, a gas, a gas-fluid mixture, steam or air.
26. System (3) according to one of Claims 1 to 25,
    characterized in that
    the dividing device (13) is implemented as a fluid jet cutting device comprising at least one nozzle.
27. System (3) according to one of Claims 1 to 25,
    characterized in that
    the dividing device (13) comprises at least one mechanical dividing element (14) in the form of a knife.
28. System (3) according to one of Claims 1 to 27,
    characterized in that
    a device (25) is provided to assist the transfer of the transfer strip (4.1).
29. System (3) according to Claim 28, characterized in that
    the device (25) for assisting the transfer of the transfer strip (4.1) and the stabilizing device (15) for the remaining web (4.2) are arranged on a supporting element (53).
30. System (3) according to one of Claims 1 to 29,
    characterized in that
    an injector device (54) for the output of a fluid jet to guide the remaining web (4.2) is arranged downstream of the stabilizing device (15).
31. Machine (2) for producing fibrous webs, in particular paper, board or tissue webs, comprising at least one wet end (19) and a dry end (1), and a system (3) for widening a fibrous web (4) according to one of Claims 1 to 30.
32. Machine (2) according to Claim 31, characterized in that
    the dividing device (13) is arranged at the wet end (19) or at the start of the dry end (1), and the stabilizing device (15) at the dry end (1).
33. Machine according to Claim 31 or 32, characterized in that
    the dry end (1) has a first drying cylinder (7.1), and the dividing device (13) is arranged upstream of the first drying cylinder (7.1), and the stabilizing device (15) is arranged downstream of the web pickup on the first drying cylinder (7.1) with an offset to the onward leading web direction of the transfer strip (4.1).
34. Method for controlling the transfer of the transfer strip or web tail in a machine (2) for producing fibrous webs (4), in particular paper, board or tissue webs, wherein, following subdivision of the fibrous web (4) into a guide path such as a transfer strip or web tail (4.1) and a remaining web (4.2), the remaining web (4.2) is deflected away from the actual guide path and supported by a stabilizing device (15).
35. Method according to Claim 34, characterized in that
    the stabilizing device active range is adjusted as a function of the width of the remaining web (4.2).
36. Method according to either of Claims 34 and 35,
    characterized in that
    in a machine (2) for producing a fibrous web (4) having a system (3) according to one of Claims 1 to 29, a web break is detected and a dividing device (13) for subdividing the fibrous web (4) into at least two part webs - a transfer strip or web tail (4.1) and a remaining web (4.2) - is activated, at least one variable at least indirectly characterizing the width of the remaining web (4.2) that is produced is registered, and the remaining web width (4.2) in the region of the stabilizing device (15) is determined and, as a function of the latter, the effective width of the stabilizing device (15) is adjusted and, upon detecting that the transfer strip (4.1) has reached the web width, the stabilizing device is deactivated.

Images