EP1640497A2 - 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 - Google Patents

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 Download PDF

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Publication number
EP1640497A2
EP1640497A2 EP05108369A EP05108369A EP1640497A2 EP 1640497 A2 EP1640497 A2 EP 1640497A2 EP 05108369 A EP05108369 A EP 05108369A EP 05108369 A EP05108369 A EP 05108369A EP 1640497 A2 EP1640497 A2 EP 1640497A2
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EP
European Patent Office
Prior art keywords
material web
pressure
machine
web
transfer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05108369A
Other languages
German (de)
English (en)
Other versions
EP1640497A3 (fr
Inventor
Tobias Wanke
Uwe Joos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Voith Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1640497A2 publication Critical patent/EP1640497A2/fr
Publication of EP1640497A3 publication Critical patent/EP1640497A3/fr
Withdrawn legal-status Critical Current

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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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • 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 machine for producing or / and treating a material web, in particular made of paper or cardboard, in which the material web can be guided by means of at least one material web guiding device of a material web forming section or material web input section along a material web guide path to pass at least one material web treatment device, with a device for Forming a transfer strip of the material web and transfer of the transfer strip through the machine, wherein the material web is thereby along the web path can be transferred, that formed by the means for forming and transfer of the transfer strip a leading transfer strip of the web and passed through the machine and the width of the transfer strip on the full web width is increased (so-called "widening"), and with means for detecting a tear the material web.
  • the invention further relates to a method for monitoring the transfer of a web of paper or cardboard along a material web guide path of a machine for producing or / and treatment of the web, wherein the transfer of the web takes place in that a leading transfer strip of the web passed through the machine and the Width of the transfer strip is increased to the full web width (so-called "broad driving").
  • the so-called web threading in a machine for producing or / and treating a material web, especially a material web of paper or cardboard, is usually carried out by means of at least one transfer strip, which is separated from the web and then passed through subsequent guiding and / or treatment facilities.
  • This type of web presentation is standard in both paper or board making machines with at least one headbox each, a wet end (in particular wire section and / or press section), a dryer section, possibly one or more processing sections (such as coating section) and offline.
  • Treatment of an otherwise produced material web provided paper or board processing machines, such as so-called coating machines.
  • various devices are known. Thus, so-called stripping devices, water jet cutting devices, laser cutting devices, etc. are used.
  • a so-called "rubber jack” is usually used, which cuts a strip into the paper web (or cardboard or tissue web) on a wire of the wire section, which then cuts through the further sections of the machine, in particular at least one press section and at least one dryer section and optionally at least one treatment section is performed.
  • a so-called top cutter is used in place of the rubber collar.
  • the device for detecting a tear in the material web is provided and designed for transferring the material web, in particular during the enlargement of the width of the transfer strip, to a tear of the transfer strip or the material web to address.
  • the method mentioned at the outset it is proposed according to the invention that, during the enlargement of the width of the transfer strip, an inspection of the transfer strip or of the material web be monitored.
  • failures during web threading, especially during spreading can be automated and thus quickly recognized, and a restart of the web threading and spreading can be initiated quickly and automatically.
  • the transfer times that occur when the machine is operating can be reduced, resulting in a greater degree of productivity.
  • Automated monitoring and, where appropriate, the initiation of suitable reaction measures is also advantageous insofar as damage to machine components as a result of a web break can be avoided, in particular by initiating a web break in the event of a web break.
  • it is also thought that the detection of a web break automatically initiates all the necessary reaction measures in order to be able to transfer the web again.
  • vacuum breaker shutters can be closed, the blanket cutter or, in general, a transferred strip forming device driven to strip position, fan speeds lowered, to name but a few examples.
  • the railway transfer can be faster and more successful.
  • the initiation of appropriate measures (rail cutting and preparing the new railway overpass) by hand by the operator can be omitted.
  • the means for detecting a tear of the web is adapted to respond based on at least one of the width of the transfer strip directly or indirectly representing detection amount to a demolition of the transfer strip or the web. Based on the method according to the invention can accordingly be provided that is monitored on the basis of at least one of the width of the transfer strip directly or indirectly repesent Schlierenden detection size on a demolition of the transfer strip or the material web.
  • the width of the transfer strip at a given position along the material web guide path is a measure of the progress of spreading.
  • the width of the transfer strip at a reference position of the transfer strip width at the location of formation of the transfer strip must correspond to a previous time dependent on the web travel speed. If one sees by appropriate control of the Gautschknechts or generally the means for forming the transfer strip, that during spreading of the transfer strip is continuously wider, so must also apply elsewhere along the material web guide path, as long as the web performance is done properly and in particular no web break occurs.
  • the means for detecting a tear may include an optical detection arrangement for detecting a web break or for providing the detection amount. Based on the method according to the invention, it is proposed that the monitoring be based on an optical detection, in particular an optical detection of the width of the transfer strip. Further, the means for detecting a tear may include a temperature detecting arrangement to detect a web break or to provide the detection amount. Based on the method according to the invention, it is proposed that the monitoring takes place on the basis of a detection of temperature values.
  • the device for detecting a tear has a pressure detection arrangement or pressure change detection arrangement in order to detect a web break or to provide pressure values as the detection variable.
  • the monitoring takes place on the basis of a detection of pressure values or pressure change values or a pressure change.
  • At least one separate pressure detection arrangement or pressure change detection arrangement can be provided to detect a web break in each section immediately and thus very quickly reacting or for the web break detection To provide pressure values as a detection quantity.
  • the pressure-sensing arrangement or pressure-change detection arrangement is designed and arranged to detect at least one momentary operating pressure at least one acting on the material web or the transfer strip vacuum device. It is, for example, thought of a so-called suction roll, which serves for material web guide and possibly web deflection.
  • the pressure detection arrangement or pressure change detection arrangement can be designed and arranged to detect at least one instantaneous operating pressure of at least one overpressure device acting on the material web or the transfer strip.
  • a so-called Airturn is used, which serves for non-contact web guidance and possibly web deflection.
  • At least one instantaneous operating pressure of at least one vacuum device or overpressure device acting on the material web or the transfer strip is detected.
  • vacuum device or overpressure device in question is provided anyway, as part of the material web guiding device on the leadership of Material web or the transfer strip at least cooperate.
  • the vacuum device may comprise at least one suction roll and / or at least one suction box or / and at least one vacuum conveyor belt.
  • the overpressure device may comprise at least one blower roll and / or at least one blow box or / and at least one airlock.
  • At least one pressure sensor of the pressure detection arrangement is arranged to / a suction box or blow box.
  • the pressure sensor is preferably arranged in a suction box associated with the suction roll.
  • the suction box comprises a transfer suction zone assigned to the transfer strip and an operating suction zone associated with the transfer line suction zone of the full material web width, which is connected or connectable to a vacuum source via the transfer suction zone
  • the pressure sensor is preferably arranged in the operating suction zone.
  • at least one can be provided by a valve flap or the like closable connection opening or connecting line, for purely inserting the narrow threading of the Transfer strip is closed in order to suck this with sufficient negative pressure can.
  • this connection opening or connection line is then opened in order to be able to monitor the proper broadening of the transfer strip or the material web via the operating pressure.
  • the machine may advantageously have an evaluation unit which is designed to compare detected pressure values or dependent thereon successive values with each other and / or at least one predetermined reference value and then, if at least one demolition condition is met, output a tear-off signal. Based on the tear-off signal, the addressed reaction measures can then be initiated and the demolition signaled to the operating personnel. Based on the method according to the invention, it is proposed that detected pressure values or dependent values dependent thereon be compared with one another and / or with at least one predetermined reference value in order to determine the fulfillment or non-fulfillment of at least one demolition condition.
  • the evaluation unit is designed to compare the size of successively recorded pressure values or corresponding consequential values with each other for checking a demolition condition, wherein the demolition condition is met when the values deviate from a predetermined desired course .
  • a demolition condition successively recorded pressure values or corresponding corresponding values be compared with each other and that the demolition condition be determined to be satisfied if the values deviate from a predetermined desired course.
  • the demolition condition is satisfied when, in the case of a vacuum device, a pressure value assigned at a later time is greater than or equal to an earlier time assigned pressure value or in the case of a pressure device, a pressure value assigned to a later time is less than or equal to a pressure value associated with an earlier time.
  • the demolition condition be determined to be satisfied if, in the case of a vacuum device, a pressure value assigned to a later time is greater than or equal to a pressure value associated with an earlier time, or in the case of an overpressure device assigned to a later time Pressure value is less than or equal to a previously assigned to a pressure value.
  • This design of the evaluation unit or of the method is then expedient and reliable if the pressure values or subsequent values compared with one another are assigned to points in time which have a certain minimum time interval relative to the path speed and the speed of broadening of the transfer strip or the material web, so that in the event of a successful, proper course, it is always ensured that the operating pressure decreases (in the case of a vacuum device) or increases (in the case of a pressure device), which applies accordingly in the case of a processing of subsequent values derived from the pressure values. If, on the other hand, an evaluation of pressure values or subsequent values which are closer together in terms of time is provided, this could lead to the detection of a break, due to possibly occurring smaller pressure fluctuations, although such has actually not occurred.
  • a tolerance range expressed, for example, by a threshold value In order to avoid such error detection, one can also include in the comparison a tolerance range expressed, for example, by a threshold value.
  • a tolerance range expressed, for example, by a threshold value.
  • the demolition condition is satisfied if, in the case of a vacuum device, a pressure value associated with a later point in time adjusts a pressure value associated with an earlier point in time by a predetermined threshold value exceeds or in the case of an overpressure device, a pressure value assigned to a later time falls below a predetermined threshold value by a pressure value associated with an earlier time.
  • the demolition condition be determined to be satisfied if, in the case of a vacuum device, a pressure value associated with a later time exceeds a previously assigned pressure value by a predetermined threshold or, in the case of an overpressure device, a later time associated pressure value falls below a predetermined threshold value below an associated pressure value.
  • the evaluation unit is designed to compare detected pressure values or dependent values of these values with a predefined reference value in order to check a widening finished condition which is satisfied when the pressure value reaches a threshold value corresponding to the reference value.
  • a predefined reference value it is proposed that detected pressure values or dependent values dependent thereon be compared with a predetermined reference value in order to determine the fulfillment or non-fulfillment of a widening ready condition which is then determined to be satisfied if the Pressure value reaches a threshold value corresponding to the reference value.
  • the device for detecting a tear of the material web can then be switched to a normal operation monitoring mode, in which monitoring for the occurrence of a web break can then take place in a conventional manner.
  • the machine can be expediently designed to automatically initiate at least one reaction measure in order to detect a break in the material web, in order to prevent damage to the machine as a consequence of the break and / or to prepare a new transfer of the material web.
  • a reaction measure one or more of the following measures may be provided: initiation of a Bruabschlag, moving machine components into a waiting or safety state, control of the overpressure or vacuum device for re-transferring the web, driving the means for forming and transfer of the transfer strip for the re-transfer of the material web.
  • the invention further provides, according to the first aspect, a device for carrying out the method according to the invention, for example for providing a machine according to the invention, for example by equipping or retrofitting a machine as mentioned above.
  • the invention further provides a machine for producing and / or treating a web of material, in particular paper or cardboard, in which the web of material, mediated by at least one web guiding device, is provided by a material web forming section or web web input section along a web guide path is feasible to pass at least one material web treatment device, comprising means for detecting a tear of the material web based on a detected operating pressure of a suction device having a suction box.
  • At least one pressure sensor for detecting the operating pressure is arranged in the suction box. It has been found that a pressure sensor arranged at this point can respond particularly reliably to pressure changes as a result of a web break. The same applies to a web tear detection in connection with the spreading of the material web according to the first aspect of the invention. Furthermore, on the basis of the pressure detected here, a diagnosis of components of the vacuum device or of an associated vacuum source (for example a valve arrangement) can be carried out particularly reliably. Erroneous detection of a tear and misdiagnosis concerning such components are thus avoided. If the suction box has a transfer suction zone assigned to the transfer strip and an operating suction zone associated with or connected to the transfer line suction zone at a vacuum source, it is preferred that the pressure sensor is arranged in the operating suction zone.
  • the evaluation unit can be constructed on the basis of an electronic computer unit, in particular a microprocessor arrangement, on which an evaluation program runs, which has the comparison of the values and the checking of the different conditions providing software functionalities.
  • Concerning the values to be compared it should be noted that it is not necessarily necessary to process original pressure readings, but that can also be processed from these derived values or data, the "following values" mentioned above, for checking for the demolition conditions and the widening finished condition.
  • Fig. 1 is a side view schematically shows a section of a dryer section of a generally designated 10 papermaking machine or paper processing machine.
  • a drying section within a paper machine fulfills the function of extracting moisture from a manufactured or processed material web, i. h. to dry this.
  • this is done by contact drying, whereby a material web 12 to be supplied from the left in the drawing is dried by direct contact with a plurality of drying cylinders 14 on the one hand and an endless drying felt 16 circulating the drying cylinders 14 on the other hand.
  • two dry felts 16 are shown in their complete circulation path, each of the dryer felts 16 each circulating a group of drying cylinders 14.
  • each dryer felt 16 in the region of the drying cylinder 14 is wavy up and down, wherein the dryer felt 16 is deflected at the wave crest of a drying cylinder 14 and is deflected in the trough by a suction roll of a respective vacuum device 18.
  • the dryer felt 16 is returned via several guide rollers 20 back to the first drying cylinder 14 of the group.
  • each Group of drying cylinders 14 at least one vacuum device 18 equipped with a device for detecting a web break, which will be described later in more detail.
  • the web 12 For drying the web 12, it is introduced into the system of drying rollers 14 and vacuum devices 18 so as to be guided on the drying cylinders 14 between the dryer felt 16 and the surface of the drying roller 14 while circulating the vacuum devices on the outside of the dryer felt 16.
  • the transfer strip is generally automatically cut out of the web of material directly prior to threading the web using a suitable means, such as a so-called gutter.
  • a suitable means such as a so-called gutter.
  • a transverse to the direction of the web slidable cutting device such as a water jet or laser cutting device, a circular blade or the like or a so-called Stenderabtschvoriques include.
  • the material web moves in the direction of travel. It will be described below by the Using a Gautschknechts assumed in a papermaking machine. The crumb is initially in a strip position and intersects a narrow foremost portion of constant width as a threading portion or ribbon which is fed through the machine by suitable means of guidance.
  • the Gautschknecht moves uniformly in the direction of the opposite edge of the web and thus cuts the transfer strip with preferably uniformly increasing width until it reaches the full width of the web and the cutting of the transfer strip is completed.
  • the web continues to move and threads into the paper machine.
  • FIGS. 2 and 3 An intended for use in a paper machine according to the present embodiment, serving as a vacuum deflecting vacuum device 18 with means for detecting a web break is explained in more detail below with reference to FIGS. 2 and 3. It comprises a suction roll 22, on which the material web 12 is deflected, and a suction box 24.
  • the suction box 24 is connected via a connecting line 26 to a vacuum source, not shown, in order to generate a negative pressure in the suction box 24 can.
  • the suction box 24 is adjacent to the suction roll 22 and has these facing openings 28. Through these openings 28 and through holes 30 in the shell of the suction roll 22, a vacuum built up in the suction box 24 can continue into the interior of the suction roll 22, so that a negative pressure can also be built up in the suction roll 22.
  • a valve 34 and a partition wall 36 is further indicated.
  • the partition wall 36 divides the interior of the suction box 24 into a Koch211gzone 38 and a Radiosaugzone 40, wherein the Koch211saugzone 38 and the Radiosaugzone 40 are connected to each other by the valve 34 or separable from each other.
  • the width of the transfer suction zone 38 measured in the material web transverse direction corresponds approximately to the width of the leading threading section of the transfer strip of the material web.
  • the front threading section of the transfer strip is followed by another section in which the width of the transfer strip continuously increases until the transfer strip finally reaches the full width of the actual material web and at this point merges integrally into the actual material web or is connected thereto.
  • the operating state of the paper machine, in which the continuously widening transfer strip is transported, is referred to as "spreading" of the material web.
  • the valve 34 is open and in both the für Industriessaugzone 38 and in the Radiosaugzone 40 and in the suction roll 22 builds up a roughly uniform negative pressure. The sucked air counteracts this build-up of negative pressure, which is sucked through those boreholes 30 or those openings 32 which are not yet covered by the transfer strip.
  • the self-adjusting pressure in the suction box 24 thus depends on the number of not covered by the transfer strip openings 30 and 32 at a constant suction power of the vacuum source. This number decreases continuously as the width of the transfer strip increases, so that the airflow entering the suction box 24 from the outside and counteracting the evacuation of the suction box 24 also decreases. As the width of the transfer strip increases, the pressure within the suction box 24 thus drops until it reaches a minimum value after the material web has been fully extended.
  • the decreasing with the width of the transfer strip operating pressure p in the suction box 24 is schematically illustrated in the diagram of FIG.
  • the material web tear-off detection device of the present invention utilizes the previously described flow of pressure within the suction box 24 during spreading of the web transfer strip to monitor proper widening and, in particular, to detect the occurrence of breakage of the transfer strip.
  • a pressure sensor 42 is arranged in the suction box 24, which detects the pressure in the suction box 24.
  • the pressure sensor 42 as shown in Fig. 2, arranged in the suction box 24 close behind the partition wall 36.
  • the arrangement of the pressure sensor 42 in the suction box 24 is advantageous because in the suction box 24, the flow cross section is relatively large and thus pressure fluctuations are relatively low.
  • the pressure sensor 42 is connected to a PI converter (pressure-current converter, not shown), which is the size of the measured pressure representing a current signal to an electronic control unit (not shown).
  • the electronic control unit can also be supplied with a position signal which indicates the movement position of the rubber bushing transversely to the running direction of the material web. From the speed of the material web as well as the distance from the rubber jack to the monitoring negative pressure device, a current target web width of the transfer strip at the monitoring vacuum device can then be determined in the electronic control unit or in an upstream computing unit in order to be available to the control unit.
  • the control unit is configured to decide, in a manner to be described later, based on the instantaneous current value communicated to it by the PI converter, as well as possibly also the instantaneous desired web width, whether a tear in the material web, in particular their flyer, present or not.
  • the electronic control unit is further arranged and implemented in the paper machine so that it can initiate certain actions in response to web break in the event of web break detection.
  • the electronic control unit is connected to a knock-off device which abuts the material web in a demolition upstream of the break point in order to avoid damage to the machine by winding operations and to prepare the web for a new threading.
  • the electronic control unit is further adapted to detect the successful completion of the widening and to output a corresponding widening ready signal.
  • the paper machine can be automatically switched to a normal operating mode in which, for example, a normal operation monitoring mode for detecting a tear of the web is turned on, in which the tear of the web is detected, for example, in a conventional manner can.
  • a normal operation monitoring mode for detecting a tear of the web is turned on, in which the tear of the web is detected, for example, in a conventional manner can.
  • the graph shows the course of the measured by the pressure sensor 42 pressure p in the period starting shortly before the start of the spreading t 1 (just before the opening of the valve 34) to a point shortly after the complete spreading of the web.
  • the valve 34 is opened, as a result of which the operating suction zone 40 is now also connected to the connecting line 26 and air is sucked out of the operating suction zone 40. Therefore, the measured pressure p decreases shortly after the time t 1 of the opening of the valve 34 quickly and reaches shortly thereafter at a time t 2 a pressure p 2, which corresponds to the presence of a transfer strip of minimum width.
  • a pressure p 2 which corresponds to the presence of a transfer strip of minimum width.
  • the pressure p reaches its minimum value p 3 at the time t 3 , when the width of the transfer strip becomes maximum and reaches the width of the actual material web. After complete widening of the material web, ie for times t> t 3 , the pressure p remains essentially constant, since the number of holes covered by the material web 30 or 32 then no longer changes.
  • the pressure curve shown in FIG. 4 corresponds to a desired pressure profile during the proper widening of the material web.
  • the electronic control unit recognizes the occurrence of a web break during widening because at least one pressure value measured at a specific time deviates significantly from the pressure profile shown in FIG. 4.
  • the accuracy and reliability of the demolition detection depends on the knowledge of operating parameters as well as on temporal fluctuations of the operating parameters. These operating parameters include, in particular, the position of the valve 34 (throttle valve angle) and the power of the vacuum source connected to the suction box.
  • the desired print run shown in FIG. 4 is stored in a memory of the electronic control unit and / or can be calculated by the control device on the basis of the current desired web width and on the basis of operating parameters of the paper machine, in particular the suction power of the vacuum source ,
  • the desired pressure curve of the electronic control unit will advantageously be available for a multiplicity of times in order to be able to provide the most continuous possible web break monitoring.
  • the desired pressure values of the desired pressure profile that are available to the electronic control unit are then compared with the actual pressure values measured by the pressure sensor 42, and the demolition of the material web is detected precisely when the actual pressure at a given instant in time reaches the corresponding setpoint pressure.
  • the size of the threshold may be set depending on the size of possible pressure fluctuations in the suction box 24 so that a random pressure increase z. B. due to short-term fluctuations in the suction power of the vacuum source or due to a local short-term lifting of the web, does not lead to the detection of a web break.
  • the successful complete widening can be detected by the fact that for measured times t> t 3 the measured pressure is equal to a pressure p 3 up to a threshold value, ie a widening ready signal can be output if the difference between the measured actual pressure and the target pressure p 3 falls below the threshold value.
  • the pressure p 3 corresponds to a minimum pressure at full marburgerer web, which also sets during the normal operating mode.
  • the pressure p 3 should be close to a minimum pressure p min , which corresponds to the best possible evacuation of the suction box 24 and the suction roll 22 by the vacuum source.
  • the pressure is p 3, however, be greater than the minimum achievable pressure p min since the web of material 30 and 32 cover the openings hardly fully dense mostly certain (especially when using a narrower web of material) and in the vacuum device leakages occur.
  • the electronic control device compares the measured pressure values do not directly target pressure values of the nominal pressure gradient, but compares two different times t 4 and t 5 received pressure values p 4 and p 5 with each other.
  • the pressure value p 5 recorded at the later time t 5 must then be smaller than the pressure value p 4 recorded at the time t 4 in accordance with the curve shown in FIG. 4 . If this is not the case, then the control device closes on a demolition of the transfer strip.
  • This embodiment variant has the advantage that it manages without specification or calculation of desired pressure values and recognizes a web break using the simple demolition condition that a pressure value recorded at a later point in time is not smaller than a pressure value recorded at an earlier point in time.
  • a third embodiment variant for detecting a breakaway of the transfer strip during the widening is conceivable, in which the demolition is carried out on the basis of the comparison of two pressure values p 6 , p 7 recorded at a short time interval (at t 6 , t 7 ).
  • the use of a demolition condition according to the second embodiment is in principle applicable, it could, however, in temporally closely spaced pressure measurements due to random Pressure fluctuations within the suction box 24 come to a false triggering a tear signal.
  • the target pressure values p 6 and p 7 are also relatively close to each other, and their difference may be in the order of magnitude of random pressure fluctuations.
  • a Bruabrisssignal is only generated when the measured at time t 7 pressure p 7 exceeds the previously measured time t 6 pressure p 6 at least by a predetermined threshold s, so if p 7 (t 7 )> p 6 (t 6 ) + s.
  • a reliable demolition detection is also possible in the evaluation of tightly consecutive pressure measurements.
  • the aforementioned three variants for detecting a material web break in the region of the profile strip can be combined as desired with one another in order to provide the most optimal possible tamping detection. It is considered to be particularly preferred if the electronic control unit continuously receives pressure values of the pressure sensor 42 (or the current values of the PI converter representing the pressure values) and the electronic control unit continuously sends the currently received pressure values to a deviation from that shown in FIG Target pressure profile monitored. Further, a combination of the first and the third embodiment may be configured such that the threshold value s used for the demolition condition according to the third embodiment is adjusted in response to the measured pressure to provide a variable threshold s (p) corresponding to the changing slope the pressure curve or a variable Fluctuationsamplitude of the pressure in response to the pressure takes into account.
  • a combination of the above-described three variants can also be used expediently in the assessment of a successfully completed latitude test for generating the latitude-finished signal.
  • a widening-ready condition can be used which indicates the successful widening when the tearing conditions according to the embodiment variants 1 and 2 have not been triggered and the pressure p reaches a target pressure value p 3 (third embodiment variant).
  • the method according to the invention can also be applied to other sections of the paper machine, for example to the press section, the pre-and / or post-dryer section, to a coater, a calender, a reel etc.

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  • Controlling Sheets Or Webs (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Paper (AREA)
EP05108369A 2004-09-27 2005-09-13 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 Withdrawn EP1640497A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004046795A DE102004046795A1 (de) 2004-09-27 2004-09-27 Einrichtung und Verfahren zur Überwachung des Überführens einer Materialbahn und speziell der Verbreiterung der Breite eines Überführstreifens auf einen Abriss des Überführstreifens oder der Materialbahn

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Publication Number Publication Date
EP1640497A2 true EP1640497A2 (fr) 2006-03-29
EP1640497A3 EP1640497A3 (fr) 2006-06-28

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EP05108369A Withdrawn EP1640497A3 (fr) 2004-09-27 2005-09-13 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

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US (2) US7473335B2 (fr)
EP (1) EP1640497A3 (fr)
DE (1) DE102004046795A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1903142A1 (fr) * 2006-09-22 2008-03-26 Voith Patent GmbH Système pour élargir une bande fibreuse, procédé de controller le transfert de la bande directrice et machine pour la fabrication d'une bande fibreuse

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US7473335B2 (en) 2009-01-06
EP1640497A3 (fr) 2006-06-28
US20060070713A1 (en) 2006-04-06

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