EP3665112B1 - Unwinding station - Google Patents

Unwinding station Download PDF

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Publication number
EP3665112B1
EP3665112B1 EP18750432.9A EP18750432A EP3665112B1 EP 3665112 B1 EP3665112 B1 EP 3665112B1 EP 18750432 A EP18750432 A EP 18750432A EP 3665112 B1 EP3665112 B1 EP 3665112B1
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EP
European Patent Office
Prior art keywords
unwinding device
web
primary
unwinding
material web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18750432.9A
Other languages
German (de)
French (fr)
Other versions
EP3665112A1 (en
Inventor
Ralf-Harald Preising
Matthias Wohlfahrt
Ewald Wetschenbacher
Herbert Illenberger
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP3665112A1 publication Critical patent/EP3665112A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
    • B65H19/181—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll
    • B65H19/1815—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll the replacement web being stationary prior to splicing contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1805—Flying splicing, i.e. the expiring web moving during splicing contact
    • B65H19/181—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll
    • B65H19/1821—Flying splicing, i.e. the expiring web moving during splicing contact taking place on the replacement roll the replacement web being accelerated or running prior to splicing contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/10—Changing the web roll in unwinding mechanisms or in connection with unwinding operations
    • B65H19/18—Attaching, e.g. pasting, the replacement web to the expiring web
    • B65H19/1857—Support arrangement of web rolls
    • B65H19/1863—Support arrangement of web rolls with translatory or arcuated movement of the roll supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
    • B65H23/08—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on web roll being unwound
    • B65H23/085—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle acting on web roll being unwound and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/412—Roll
    • B65H2301/4128—Multiple rolls
    • B65H2301/41284—Multiple rolls involving juxtaposed lanes wound around a common axis
    • B65H2301/412845—Multiple rolls involving juxtaposed lanes wound around a common axis and spliced to each other, e.g. for serial unwinding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/413—Supporting web roll
    • B65H2301/4134—Both ends type arrangement
    • B65H2301/41342—Both ends type arrangement shaft transversing the roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/413—Supporting web roll
    • B65H2301/4135—Movable supporting means
    • B65H2301/41352—Movable supporting means moving on linear path (including linear slot arrangement)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/417—Handling or changing web rolls
    • B65H2301/4171—Handling web roll
    • B65H2301/4173—Handling web roll by central portion, e.g. gripping central portion
    • B65H2301/41734—Handling web roll by central portion, e.g. gripping central portion involving rail
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/44—Moving, forwarding, guiding material
    • B65H2301/446—Assisting moving, forwarding or guiding of material
    • B65H2301/4462—Assisting moving, forwarding or guiding of material by jogging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/461—Processing webs in splicing process
    • B65H2301/4615—Processing webs in splicing process after splicing
    • B65H2301/4617—Processing webs in splicing process after splicing cutting webs in splicing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/46—Splicing
    • B65H2301/463—Splicing splicing means, i.e. means by which a web end is bound to another web end
    • B65H2301/4633—Glue
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/90—Machine drive
    • B65H2403/94—Other features of machine drive
    • B65H2403/942—Bidirectional powered handling device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/84—Paper-making machines

Definitions

  • the invention relates to a method for unwinding a material web, in particular a paper or cardboard web, with a choice of position of the material web for a subsequent machine unit for processing the material web, with an unwinding station which has a primary unwinding device with a winding roller drive, at least one secondary unwinding device as well as a gluing and separating device, wherein the wound roll is first unwound in the primary unwinding device and then further unwound after its transfer in a secondary unwinding device and a new wound roll is inserted into the primary unwinding device and the gluing and separating device removes the material web when the roll is changed connects the secondary unwinding device to the material web of the new winding roll and cuts through the material web running from the secondary unwinding device to the splice.
  • Unwind stations of the type discussed here are known. They are used for the continuous unwinding of a material web from a winding roll and are arranged upstream of a machine for processing the material web, for example a coating machine or a calender.
  • WO-A1-2009/135805 describes a method for unwinding a web of material.
  • a known unwinding station includes a primary and a secondary unwinding device, which serve to guide a winding roll.
  • a full winding roll is first guided by the primary unwind device during the unwinding of the material web. From a desired diameter of the wound roll, it is transferred from the primary to the secondary unwinding device.
  • pivoting arms that can be pivoted about an axis are used, which act on both sides of the winding roll and transfer it to the secondary unwinding device by means of a pivoting movement.
  • an additional, pivotable auxiliary drive is provided, which drives the winding roll during this transfer.
  • a new, full winding roll is then fed to the primary unwinding device and the material web wound up on it is connected to the winding roll running off the secondary unwinding device before this is fully settled.
  • a gluing device is provided for this purpose, which often has a gluing roller pivotable about an axis, via which the material web running off the secondary unwinding device is guided to the subsequent material web processing machine—seen in the running direction of the material web.
  • the adhesive roller is pivoted and pressed against the winding roll guided by the primary unwinding device.
  • the material web running off the secondary unwinding device is cut off by means of a cutting device.
  • the upper side of the material web on the winding roll can point either upwards or downwards when it is fed to the subsequent machine unit.
  • the object of the invention is therefore to reduce the effort required for the optional position of the material web during unwinding.
  • the object was achieved in that the single secondary unwinding device is arranged between the primary unwinding device and the following machine unit, the primary unwinding device (3) is driven in a direction of rotation corresponding to the position in order to change the position of the material web (1) to be unwound and the connection between the material webs takes place when the new winding roll is intended to be unwound with the top side of the web pointing downwards when the new winding roll of the primary unwinding device is stationary or at a rotational speed of the new winding roll of the primary unwinding device which is between 0 and 4 m/s.
  • the primary unwinding device is driven in a direction of rotation corresponding to the position in order to change the position of the material web to be unwound.
  • the purpose of the web tensioning process is to prevent the drop in web tension or at least to limit it in terms of time and/or intensity.
  • a web tensioning device in the form of a tensioning roller can be pressed into the run of the material web after the primary unwinding device and/or a web tensioning device in the form of a blowing element can direct blown air into the run of the material web.
  • the winding roll of the primary unwinding device is briefly driven in the opposite direction.
  • a drive of the secondary unwinding device should drive the winding roll counter to the unwinding direction in order to wind up the web end that remains there.
  • the single secondary unwinding device is arranged between the primary unwinding device and the machine unit that follows in the direction of web travel, and that the primary unwinding device can be driven in a direction of rotation corresponding to the position in order to change the position of the material web to be unwound.
  • the secondary unwinding station should also have a drive.
  • the production of a connection between the webs of material is also facilitated if the primary unwinding device is stationary and the secondary unwinding device is mounted so that it can be displaced towards the primary unwinding device for the purpose of taking over a wound roll.
  • This web tensioning device should preferably be designed as a blower element, in particular as a blower box or blower tube and/or as a tensioning roller.
  • the following machine unit is a smoothing device or a coating machine or, in particular, a rotary cutting machine.
  • the attached drawing shows the Figures 1 to 6 a schematic side view of the unwinding station and the process of unwinding.
  • the unwinding station described below can be used in particular in connection with a rotary cutting machine or the like as the downstream machine unit 2 .
  • the unwinding station has a primary unwinding device 3 with a winding roll drive, only one secondary unwinding device 4 with a winding roll drive and a gluing and separating device 5.
  • the working position of the secondary unwinding device 4 is between the primary unwinding device 3 and the machine unit 2 following in the direction of web travel 9, i.e. the winder.
  • the processing begins in the primary unwinding device 3, which the full winding roll 7 is fed.
  • a winding roll 7 is wound onto the spool, which can have a diameter of, for example, 3500 mm and more.
  • the primary unwinding device 3 and the secondary unwinding device 5 are connected to one another via a guide device which comprises two running rails 8 running parallel to one another and horizontally.
  • the secondary unwinding device 4 is together with its drive for the purpose of taking over the already mostly unwound winding roll 7 along the guide device slidably back and forth from its working position to the primary unwinding device 3 .
  • the spools which are provided with bearing journals at their ends, are each mounted in a receiving fork of the secondary unwinding device 4 .
  • figure 2 shows the unwinding station after the winding roll 7 has been taken over by the secondary unwinding station 4 and figure 3 after subsequent acceptance of a new, full winding roll 7 by the primary unwinding station 3.
  • the full winding roll 7 can be transported to the primary unwinding device 3 without having to overcome an otherwise usual second secondary unwinding device 4.
  • the direction of rotation of the winding roll 7 in the primary 3 and thus also the secondary unwinding device 4 can be selected such that the upper side of the material web 1 points downwards or upwards when it is fed to the subsequent machine unit 2 .
  • the upper side of the material web 1 always refers to the winding roll 7.
  • the position of the material web 1 in the following machine unit 2 is particularly important when both sides of the web have different material properties and the position of the side during further processing, especially in the following machine unit 2 is important.
  • unwinding in the clockwise direction means that the upper side of the material web 1 points downwards when it reaches the following machine unit 2.
  • unwinding counterclockwise the top of the material web 1 points upwards.
  • the diameter of the winding roll 7 and thus the extent of the unwinding are detected by a distance sensor.
  • the gluing and separating device 5 separates the material web 1 coming from the secondary unwinding device 4 in front of the connection point.
  • the drive of the secondary unwinding device 4 then briefly drives the winding roller 7 in the opposite direction to the unwinding direction.
  • the well-known gluing and separating device 5 responsible for connecting the web ends is located below the primary unwinding device 3 and can be adjusted in order to adapt to changing diameters of full winding rolls 8 .
  • the gluing and separating device 5 of the unwinding station comprises a gluing carriage that holds the gluing roller.
  • a cutting device is also attached to the gluing carriage, which has a cut-off knife, preferably provided with serrations.
  • figure 5 shows the case in which the current or intended unwinding direction of the new, full wound roll 7 at the connection point corresponds to the running direction of the material web 1 running off the secondary unwinding device 4.
  • the material webs can be connected at a rotational speed of the new winding roll 7 of the primary unwinding device 3 of between 0 and 4 m/s.
  • a web tensioning device 6 can also be activated.
  • the web tensioning device 6 is located between the new winding roll 7 of the primary unwinding device 3 and a deflection roller 10 following in the direction of web travel 9.
  • a tension roller can be pressed into the course of the material web 1 as the web tensioning device 6 and/or a blowing element can direct blown air into the course of the material web 1 .
  • connection between the material webs 1 should take place when the new winding roll 7 is stationary or at a rotational speed of the new winding roll 7 of the primary unwinding device 3, which is between 0 and 1 m/s.
  • the two winding roll drives are arranged on different sides of the machine. Specifically, the larger drive of the primary unwinding device 3 for the full winding roll 7 is on the machine side and the smaller drive for the mostly unwound winding roll 7 of the secondary unwinding device 4 is on the driver's side of the machine, which is accessible to the operator.
  • the drive of the secondary unwinding device 4 remains coupled to the winding roll 7 after the takeover until the end of the unwinding, ie the unwinding station manages with two drives.
  • the larger drive of the primary unwinding device 3 is fixed and only the smaller drive is displaceable, which simplifies the construction.
  • the web tension is controlled throughout the process, which counteracts winding errors.

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  • Replacement Of Web Rolls (AREA)
  • Vehicle Body Suspensions (AREA)
  • Axle Suspensions And Sidecars For Cycles (AREA)
  • Packaging Of Special Articles (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Abwickeln einer Materialbahn, insbesondere Papier- oder Kartonbahn, mit wahlweiser Lage der Materialbahn für eine nachfolgende Maschineneinheit zur Bearbeitung der Materialbahn, mit einer Abrollstation, die eine Primär-Abrolleinrichtung mit einem Wickelrollen-Antrieb, zumindest eine Sekundär-Abrolleinrichtung sowie eine Klebe- und Trennvorrichtung umfasst, wobei die Wickelrolle zuerst in der Primär-Abrolleinrichtung und nach ihrer Überführung in einer Sekundär-Abrolleinrichtung weiter abgewickelt und eine neue Wickelrolle in die Primär-Abrolleinrichtung eingelegt wird und die Klebe- und Trennvorrichtung bei einem Rollenwechsel die Materialbahn der Sekundär-Abrolleinrichtung mit der Materialbahn der neuen Wickelrolle verbindet und die von der Sekundär-Abrolleinrichtung zur Klebstelle laufende Materialbahn durchtrennt. Abrollstationen der hier angesprochenen Art sind bekannt. Sie dienen zum kontinuierlichen Abwickeln einer Materialbahn von einer Wickelrolle und werden einer Maschine zur Bearbeitung der Materialbahn, beispielsweise einer Streichmaschine oder einem Kalander, vorgeordnet. WO-A1-2009/135805 beschreibt ein Verfahren zum Abwickeln einer Materialbahn.The invention relates to a method for unwinding a material web, in particular a paper or cardboard web, with a choice of position of the material web for a subsequent machine unit for processing the material web, with an unwinding station which has a primary unwinding device with a winding roller drive, at least one secondary unwinding device as well as a gluing and separating device, wherein the wound roll is first unwound in the primary unwinding device and then further unwound after its transfer in a secondary unwinding device and a new wound roll is inserted into the primary unwinding device and the gluing and separating device removes the material web when the roll is changed connects the secondary unwinding device to the material web of the new winding roll and cuts through the material web running from the secondary unwinding device to the splice. Unwind stations of the type discussed here are known. They are used for the continuous unwinding of a material web from a winding roll and are arranged upstream of a machine for processing the material web, for example a coating machine or a calender. WO-A1-2009/135805 describes a method for unwinding a web of material.

Eine bekannte Abrollstation umfasst eine Primär- und eine Sekundär-Abrolleinrichtung, die zum Führen einer Wickelrolle dienen. Eine volle Wickelrolle wird zunächst von der Primär-Abrolleinrichtung während des Abwickelns der Materialbahn geführt. Ab einem gewünschten Durchmesser der Wickelrolle wird diese von der Primär- zu der Sekundär-Abrolleinrichtung überführt. Hierzu werden zum Beispiel um eine Achse schwenkbare Schwenkarme eingesetzt, die auf beiden Seiten der Wickelrolle angreifen und diese mittels einer Schwenkbewegung an die Sekundär-Abrolleinrichtung überführen.A known unwinding station includes a primary and a secondary unwinding device, which serve to guide a winding roll. A full winding roll is first guided by the primary unwind device during the unwinding of the material web. From a desired diameter of the wound roll, it is transferred from the primary to the secondary unwinding device. For this purpose, for example, pivoting arms that can be pivoted about an axis are used, which act on both sides of the winding roll and transfer it to the secondary unwinding device by means of a pivoting movement.

Weiterhin ist ein zusätzlicher, verschwenkbarer Hilfsantrieb vorgesehen, der die Wickelrolle während dieser Überführung antreibt.Furthermore, an additional, pivotable auxiliary drive is provided, which drives the winding roll during this transfer.

Anschließend wird der Primär-Abrolleinrichtung eine neue, volle Wickelrolle zugeführt und die darauf aufgewickelte Materialbahn mit der von der Sekundär-Abrolleinrichtung geführten Wickelrolle ablaufenden Materialbahn verbunden, bevor diese vollständig abgewickelt ist. Hierfür ist eine Klebevorrichtung vorgesehen, die oft eine um eine Achse schwenkbare Klebewalze aufweist, über die die von der Sekundär-Abrolleinrichtung geführten Wickelrolle ablaufende Materialbahn zu der - in Laufrichtung der Materialbahn gesehen - nachfolgenden Materialbahn-Bearbeitungsmaschine geführt wird. Zum Verbinden der beiden Materialbahnen miteinander wird die Klebewalze verschwenkt und an die von der Primär-Abrolleinrichtung geführte Wickelrolle gepresst. Gleichzeitig wird die von der Sekundär-Abrolleinrichtung geführten Wickelrolle ablaufende Materialbahn mittels einer Schneideinrichtung abgetrennt.A new, full winding roll is then fed to the primary unwinding device and the material web wound up on it is connected to the winding roll running off the secondary unwinding device before this is fully settled. A gluing device is provided for this purpose, which often has a gluing roller pivotable about an axis, via which the material web running off the secondary unwinding device is guided to the subsequent material web processing machine—seen in the running direction of the material web. To connect the two webs of material to one another, the adhesive roller is pivoted and pressed against the winding roll guided by the primary unwinding device. At the same time, the material web running off the secondary unwinding device is cut off by means of a cutting device.

Hierbei muss meist berücksichtigt werden, dass die Oberseite der auf der Wickelrolle befindlichen Materialbahn bei Zuführung zur nachfolgenden Maschineneinheit wahlweise nach oben oder unten zeigen kann.Here, it must usually be taken into account that the upper side of the material web on the winding roll can point either upwards or downwards when it is fed to the subsequent machine unit.

Dementsprechend befindet sich beidseitig der Primär-Abrolleinrichtung je eine Sekundär-Abrolleinrichtung, was relativ aufwendig ist. Hinzu kommt, dass die neue, volle Wickelrolle über eine Sekundär-Abrolleinrichtung hinweg zur Primär-Abrolleinrichtung transportiert werden muss. Allein durch das hohe Gewicht der vollen Wickelrolle ist dies problematisch.Accordingly, there is a secondary unwinding device on each side of the primary unwinding device, which is relatively expensive. In addition, the new, full winding roll has to be transported via a secondary unwinding device to the primary unwinding device. This is problematic simply because of the high weight of the full winding roll.

Die Aufgabe der Erfindung ist es daher den Aufwand für die wahlweise Lage der Materialbahn bei der Abrollung zu reduzieren.The object of the invention is therefore to reduce the effort required for the optional position of the material web during unwinding.

Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass die einzige Sekundär-Abrolleinrichtung zwischen der Primär-Abrolleinrichtung und der folgenden Maschineneinheit angeordnet ist, die Primär-Abrolleinrichtung (3) zum Wehsel der Lage der abzuwickelnden Materialbahn (1) in eine der Lage entsprechende Rotationsrichtung angetrieben wird und die Verbindung zwischen den Materialbahnen bei einer beabsichtigen Abrollung der neuen Wickelrolle mit nach unten weisenden Bahnoberseite bei Stillstand der neuen Wickelrolle der Primär-Abrolleinrichtung oder bei einer Rotationsgeschwindigkeit der neuen Wickelrolle der Primär-Abrolleinrichtung erfolgt, die zwischen 0 und 4 m/s liegt.According to the invention, the object was achieved in that the single secondary unwinding device is arranged between the primary unwinding device and the following machine unit, the primary unwinding device (3) is driven in a direction of rotation corresponding to the position in order to change the position of the material web (1) to be unwound and the connection between the material webs takes place when the new winding roll is intended to be unwound with the top side of the web pointing downwards when the new winding roll of the primary unwinding device is stationary or at a rotational speed of the new winding roll of the primary unwinding device which is between 0 and 4 m/s.

Hierbei wird die Primär-Abrolleinrichtung zum Wechsel der Lage der abzuwickelnden Materialbahn in eine der Lage entsprechende Rotationsrichtung angetrieben.In this case, the primary unwinding device is driven in a direction of rotation corresponding to the position in order to change the position of the material web to be unwound.

Dies bedeutet, dass die Verbindung des Bahnendes der Sekundär-Abrolleinrichtung mit der vollen Wickelrolle der Primär-Abrolleinrichtung unabhängig von der aktuellen bzw. beabsichtigten Rotationsrichtung der Primär-Abrolleinrichtung erfolgt.This means that the web end of the secondary unwinding device is connected to the full winding roll of the primary unwinding device independently of the current or intended direction of rotation of the primary unwinding device.

Unabhängig von der Bahnlaufrichtung der zu verbindenden Materialbahnen ist es für einen sicheren Rollenwechsel von Vorteil, wenn die Verbindung zwischen den Materialbahnen bei Stillstand der neuen Wickelrolle der Primär-Abrolleinrichtung oder bei einer Rotationsgeschwindigkeit der neuen Wickelrolle der Primär-Abrolleinrichtung erfolgt, die zwischen 0 und 4 m/s, vorzugsweise zwischen 0 und 1 m/s liegt.Irrespective of the direction of travel of the material webs to be connected, it is advantageous for a reliable roll change if the connection between the material webs takes place when the new winding roll of the primary unwinding device is stationary or at a rotational speed of the new winding roll of the primary unwinding device that is between 0 and 4 m/s, preferably between 0 and 1 m/s.

Wenn am Verbindungspunkt die Bahnlaufrichtung der von der Sekundär-Abrolleinrichtung kommenden Materialbahn entgegengesetzt zur aktuellen Bahnlaufrichtung der vollen Wickelrolle der Primär-Abrolleinrichtung, d.h. die Abrollung der neuen Wickelrolle mit nach unten weisenden Bahnoberseite beabsichtigt ist, so führt dies zu einem Abfall der Bahnspannung.If at the connection point the direction of travel of the material web coming from the secondary unwinding device is opposite to the current direction of travel of the full winding roll of the primary unwinding device, i.e. the intention is to unwind the new winding roll with the top side of the web pointing downwards, this leads to a drop in web tension.

Daher sollte bei einer beabsichtigen Abrollung der neuen Wickelrolle mit nach unten weisenden Bahnoberseite ein Bahnspannverfahren eingeleitet werden. Da sich die Sekundär-Abrolleinrichtung immer zwischen der Primär-Abrolleinrichtung und der nachfolgenden Maschine zur Bearbeitung der Materialbahn befindet, führt das Abwickeln von der neuen Wickelrolle in der Form, dass die Oberseite bei der Wickelrolle anschließend nach unten weist, zu der bereits erwähnten entgegengesetzten Richtung beim Verbinden mit dem Bahnende der Sekundär-Abrolleinrichtung.Therefore, if the new winding roll is intended to be unwound with the upper side of the web pointing downwards, a web tensioning procedure should be initiated. Since the secondary unwinding device is always located between the primary unwinding device and the subsequent machine for processing the material web, unwinding from the new winding roll in the form that the top of the winding roll then points downwards leads to the opposite direction already mentioned when connecting to the tail of the secondary unwinder.

Durch das Bahnspannverfahren soll der Abfall der Bahnspannung verhindert oder zumindest hinsichtlich Zeitdauer und/oder Intensität begrenzt werden.The purpose of the web tensioning process is to prevent the drop in web tension or at least to limit it in terms of time and/or intensity.

Zur Erhöhung der Bahnspannung kann nach der Primär-Abrolleinrichtung eine Bahnspanneinrichtung in Form einer Spannwalze in den Lauf der Materialbahn gedrückt werden und/oder eine Bahnspanneinrichtung in Form eines Blaselementes Blasluft in den Lauf der Materialbahn richten.To increase the web tension, a web tensioning device in the form of a tensioning roller can be pressed into the run of the material web after the primary unwinding device and/or a web tensioning device in the form of a blowing element can direct blown air into the run of the material web.

Davon unabhängig oder ergänzend ist es ebenso vorteilhaft, wenn zur Erhöhung der Bahnspannung die Wickelrolle der Primär-Abrolleinrichtung kurzzeitig in entgegengesetzter Richtung angetrieben wird.Regardless of or in addition to this, it is also advantageous if, in order to increase the web tension, the winding roll of the primary unwinding device is briefly driven in the opposite direction.

Zum Abschluss der Übergabe sollte nach dem Durchtrennen der Materialbahn ein Antrieb der Sekundär-Abrolleinrichtung die Wickelrolle zum Aufwickeln des dort verbleibenden Bahnendes entgegen der Abrollrichtung antreiben.At the end of the transfer, after the material web has been severed, a drive of the secondary unwinding device should drive the winding roll counter to the unwinding direction in order to wind up the web end that remains there.

Bezüglich der Abrollstation ist wesentlich, dass die einzige Sekundär-Abrolleinrichtung zwischen der Primär-Abrolleinrichtung und der in Bahnlaufrichtung folgenden Maschineneinheit angeordnet ist und die Primär-Abrolleinrichtung zum Wechsel der Lage der abzuwickelnden Materialbahn in eine der Lage entsprechende Rotationsrichtung antreibbar ist.With regard to the unwinding station, it is essential that the single secondary unwinding device is arranged between the primary unwinding device and the machine unit that follows in the direction of web travel, and that the primary unwinding device can be driven in a direction of rotation corresponding to the position in order to change the position of the material web to be unwound.

Zur Unterstützung des Abwickelns sollte hierbei auch die Sekundär-Abrollstation einen Antrieb besitzen.To support the unwinding, the secondary unwinding station should also have a drive.

Die Herstellung einer Verbindung zwischen den Materialbahnen wird außerdem erleichtert, wenn die Primär-Abrolleinrichtung feststeht und die Sekundär Abrolleinrichtung zwecks Übernahme einer Wickelrolle zur Primär-Abrolleinrichtung hin verschiebbar gelagert ist.The production of a connection between the webs of material is also facilitated if the primary unwinding device is stationary and the secondary unwinding device is mounted so that it can be displaced towards the primary unwinding device for the purpose of taking over a wound roll.

In Fällen mit Bahnspannungsverlust, insbesondere bei nach unten weisender Oberseite der Materialbahn ist es von Vorteil, wenn der Materialbahn nach der Primär-Abrolleinrichtung wenigstens eine Bahnspanneinrichtung zugeordnet ist.In cases where there is a loss of web tension, in particular when the upper side of the material web is pointing downwards, it is advantageous if at least one web tensioning device is assigned to the material web after the primary unwinding device.

Diese Bahnspanneinrichtung sollte vorzugsweise als Blaselement, insbesondere als Blaskasten oder Blasrohr und/oder als Spannwalze ausgebildet sein.This web tensioning device should preferably be designed as a blower element, in particular as a blower box or blower tube and/or as a tensioning roller.

Besondere Vorteile ergeben sich, wenn die nachfolgende Maschineneinheit eine Glättvorrichtung oder eine Streichmaschine oder insbesondere eine Rollschneidmaschine ist.There are particular advantages if the following machine unit is a smoothing device or a coating machine or, in particular, a rotary cutting machine.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.

In der beigefügten Zeichnung zeigen die Figuren 1 bis 6 eine schematische Seitenansicht der Abrollstation sowie den Ablauf des Abwickelns.The attached drawing shows the Figures 1 to 6 a schematic side view of the unwinding station and the process of unwinding.

Die im Folgenden beschriebene Abrollstation ist insbesondere im Zusammenhang mit einer Rollenschneidmaschine oder dergleichen als nachfolgende Maschineneinheit 2 einsetzbar.The unwinding station described below can be used in particular in connection with a rotary cutting machine or the like as the downstream machine unit 2 .

In der Abrollstation werden auf Tamboure zu Wickelrollen 7 aufgewickelte Materialbahnen 1 miteinander verbunden, also endlos gemacht, so dass ein kontinuierlicher Verarbeitungsbetrieb in einer der Abrollstation - in Laufrichtung 9 der Materialbahn 1 gesehen - nachgeordneten Rollenschneidmaschine möglich ist.In the unwinding station, webs of material 1 wound on reels 7 are connected to one another, ie made endless, so that continuous processing operation in one of the unwinding station—seen in the running direction 9 of the material web 1—is possible.

Hierzu besitzt die Abrollstation eine Primär-Abrolleinrichtung 3 mit einem Wickelrollen-Antrieb, nur eine Sekundär-Abrolleinrichtung 4 mit einem Wickelrollen-Antrieb sowie eine Klebe- und Trennvorrichtung 5. Dabei befindet sich die Arbeitsposition der Sekundär-Abrolleinrichtung 4 zwischen der Primär-Abrolleinrichtung 3 und der in Bahnlaufrichtung 9 nachfolgenden Maschineneinheit 2, d.h. der Rollenschneidmaschine.For this purpose, the unwinding station has a primary unwinding device 3 with a winding roll drive, only one secondary unwinding device 4 with a winding roll drive and a gluing and separating device 5. The working position of the secondary unwinding device 4 is between the primary unwinding device 3 and the machine unit 2 following in the direction of web travel 9, i.e. the winder.

Wie in Figur 1 zu erkennen, beginnt die Abwicklung in der Primär-Abrolleinrichtung 3, der die volle Wickelrolle 7 zugeführt wird. Auf dem Tambour ist dabei eine Wickelrolle 7 aufgewickelt, die einen Durchmesser von beispielsweise 3500 mm und darüber aufweisen kann.As in figure 1 to recognize, the processing begins in the primary unwinding device 3, which the full winding roll 7 is fed. A winding roll 7 is wound onto the spool, which can have a diameter of, for example, 3500 mm and more.

Die Primär-Abrolleinrichtung 3 und die Sekundär-Abrolleinrichtung 5 sind über eine Führungseinrichtung miteinander verbunden, welche zwei parallel zueinander und horizontal verlaufende Laufschienen 8 umfasst.The primary unwinding device 3 and the secondary unwinding device 5 are connected to one another via a guide device which comprises two running rails 8 running parallel to one another and horizontally.

Während die Primär-Abrolleinrichtung 3 mit Vorteil in Bahnlaufrichtung feststeht, ist die Sekundär-Abrolleinrichtung 4 gemeinsam mit ihrem Antrieb zwecks Übernahme der bereits überwiegend abgewickelten Wickelrolle 7 entlang der Führungseinrichtung von ihrer Arbeitsposition zur Primär-Abrolleinrichtung 3 hin und wieder zurück verschiebbar gelagert.While the primary unwinding device 3 is advantageously fixed in the direction of web travel, the secondary unwinding device 4 is together with its drive for the purpose of taking over the already mostly unwound winding roll 7 along the guide device slidably back and forth from its working position to the primary unwinding device 3 .

Dabei werden die an ihren Enden mit Lagerzapfen versehenen Tamboure in je einer Aufnahmegabel der Sekundär-Abrolleinrichtung 4 gelagert.The spools, which are provided with bearing journals at their ends, are each mounted in a receiving fork of the secondary unwinding device 4 .

Figur 2 zeigt die Abrollstation nach Übernahme der Wickelrolle 7 durch die Sekundär-Abrollstation 4 und Figur 3 nach anschließender Übernahme einer neuen, vollen Wickelrolle 7 durch die Primär-Abrollstation 3. Die volle Wickelrolle 7 kann dabei ohne eine sonst übliche zweite Sekundär-Abrolleinrichtung 4 überwinden zu müssen zur Primär-Abrolleinrichtung 3 transportiert werden. figure 2 shows the unwinding station after the winding roll 7 has been taken over by the secondary unwinding station 4 and figure 3 after subsequent acceptance of a new, full winding roll 7 by the primary unwinding station 3. The full winding roll 7 can be transported to the primary unwinding device 3 without having to overcome an otherwise usual second secondary unwinding device 4.

Dabei kann die Rotationsrichtung der Wickelrolle 7 in der Primär- 3 und damit auch der Sekundär-Abrolleinrichtung 4 so gewählt werden, dass die Oberseite der Materialbahn 1 bei Zuführung zur nachfolgenden Maschineneinheit 2 nach unten oder nach oben weist. Die Oberseite der Materialbahn 1 bezieht sich hierbei immer auf die Wickelrolle 7. Die Lage der Materialbahn 1 bei der nachfolgenden Maschineneinheit 2 ist insbesondere dann wichtig, wenn beide Bahnseiten unterschiedliche Materialeigenschaften aufweisen und die Lage der Seite bei der weiteren Verarbeitung, insbesondere in der nachfolgenden Maschineneinheit 2 von Bedeutung ist.The direction of rotation of the winding roll 7 in the primary 3 and thus also the secondary unwinding device 4 can be selected such that the upper side of the material web 1 points downwards or upwards when it is fed to the subsequent machine unit 2 . The upper side of the material web 1 always refers to the winding roll 7. The position of the material web 1 in the following machine unit 2 is particularly important when both sides of the web have different material properties and the position of the side during further processing, especially in the following machine unit 2 is important.

Im Unterschied zu bekannten Lösungen wird dies hier bei nur einer Sekundär-Abrolleinrichtung 4 ermöglicht, was den Aufwand erheblich reduziert.In contrast to known solutions, this is made possible here with only one secondary unwinding device 4, which considerably reduces the effort.

Befindet sich die nachfolgende Maschineneinheit 2, wie in den Figuren dargestellt, links der Sekundär-Abrolleinrichtung 4, so führt eine Abwicklung im Uhrzeigersinn (gestrichelt dargestellt) dazu, dass die Oberseite der Materialbahn 1 beim Erreichen der nachfolgenden Maschineneinheit 2 nach unten zeigt. Bei der Abwicklung entgegen dem Uhrzeigersinn weist die Oberseite der Materialbahn 1 nach oben.If the following machine unit 2 is located to the left of the secondary unwinding device 4, as shown in the figures, unwinding in the clockwise direction (shown in dashed lines) means that the upper side of the material web 1 points downwards when it reaches the following machine unit 2. When unwinding counterclockwise, the top of the material web 1 points upwards.

Der Durchmesser der Wickelrolle 7 und damit der Umfang der Abrollung werden von einem Abstandssensor erfasst.The diameter of the winding roll 7 and thus the extent of the unwinding are detected by a distance sensor.

Erreichen die Abrollung und damit der Durchmesser der Wickelrolle 7 gemäß Figur 3 einen vorgegebenen Wert, so wird, wie in Figur 4 zu erkennen, die von der Sekundär-Abrolleinrichtung 4 kommende Materialbahn 1 über die Klebe- und Trennvorrichtung 5 mit der Materialbahn 1 der neuen, vollen Wickelrolle 7 der Primär-Abrolleinrichtung 3 in Verbindung gebracht und verklebt.Reach the unrolling and thus the diameter of the winding roll 7 according to figure 3 a predetermined value, as in figure 4 to recognize that the web of material 1 coming from the secondary unwinding device 4 is connected and glued via the gluing and separating device 5 to the web of material 1 of the new, full winding roll 7 of the primary unwinding device 3 .

Darüber hinaus trennt die Klebe- und Trennvorrichtung 5 die von der Sekundär-Abrolleinrichtung 4 kommende Materialbahn 1 vor der Verbindungsstelle.In addition, the gluing and separating device 5 separates the material web 1 coming from the secondary unwinding device 4 in front of the connection point.

Zum Einwickeln der nach dem Abtrennen des ablaufenden Bahnendes überhängenden Papierfahne treibt der Antrieb der Sekundär-Abrolleinrichtung 4 die Wickelrolle 7 dann kurzzeitig entgegen der Abrollrichtung an.In order to wrap the overhanging paper web after the trailing tail has been cut off, the drive of the secondary unwinding device 4 then briefly drives the winding roller 7 in the opposite direction to the unwinding direction.

Die bekannte und für das Verbinden der Bahnenden verantwortliche Klebe- und Trennvorrichtung 5 befindet sich unterhalb der Primär-Abrolleinrichtung 3 und ist zwecks Anpassung an sich ändernde Durchmesser voller Wickelrollen 8 verstellbar.The well-known gluing and separating device 5 responsible for connecting the web ends is located below the primary unwinding device 3 and can be adjusted in order to adapt to changing diameters of full winding rolls 8 .

Die Klebe- und Trennvorrichtung 5 der Abrollstation umfasst einen Klebewagen, der die Klebewalze hält.The gluing and separating device 5 of the unwinding station comprises a gluing carriage that holds the gluing roller.

An dem Klebewagen ist auch eine Schneideinrichtung angebracht, die ein vorzugsweise mit Zacken versehenes Abschlagmesser aufweist.A cutting device is also attached to the gluing carriage, which has a cut-off knife, preferably provided with serrations.

Figur 5 zeigt den Fall, dass die aktuelle oder beabsichtigte Abrollrichtung der neuen, vollen Wickelrolle 7 an der Verbindungsstelle mit der Laufrichtung der von der Sekundärabrolleinrichtung 4 ablaufenden Materialbahn 1 übereinstimmt. figure 5 shows the case in which the current or intended unwinding direction of the new, full wound roll 7 at the connection point corresponds to the running direction of the material web 1 running off the secondary unwinding device 4.

Da hier nicht mit Problemen hinsichtlich der Bahnspannung gerechnet werden muss, kann die Verbindung zwischen den Materialbahnen bei einer Rotationsgeschwindigkeit der neuen Wickelrolle 7 der Primär-Abrolleinrichtung 3 erfolgen, die zwischen 0 und 4 m/s liegt.Since there are no web tension problems, the material webs can be connected at a rotational speed of the new winding roll 7 of the primary unwinding device 3 of between 0 and 4 m/s.

Im Fall einer beabsichtigen Abrollung der neuen Wickelrolle 7 mit nach unten weisender Bahnoberseite ist allerdings mit einem Abfall der Bahnspannung zu rechnen. Daher sollte, wie in Figur 6 angedeutet, ein Bahnspannverfahren eingeleitet werden.If the new winding roll 7 is intended to be unwound with the top side of the web pointing downwards, however, a drop in web tension is to be expected. Therefore, as in figure 6 indicated, a web tensioning process to be initiated.

So ist es zur Erhöhung der Bahnspannung möglich, die Wickelrolle 7 der Primär-Abrolleinrichtung 3 kurzzeitig in entgegengesetzter Richtung anzutreiben.In order to increase the web tension, it is possible to drive the winding roll 7 of the primary unwinding device 3 briefly in the opposite direction.

Alternativ oder ergänzend kann gemäß Figur 6 allerdings auch eine Bahnspanneinrichtung 6 aktiviert werden. Die Bahnspanneinrichtung 6 befindet sich zwischen der neuen Wickelrolle 7 der Primär-Abrolleinrichtung 3 und einer in Bahnlaufrichtung 9 folgenden Umlenkwalze 10.Alternatively or additionally, according to figure 6 However, a web tensioning device 6 can also be activated. The web tensioning device 6 is located between the new winding roll 7 of the primary unwinding device 3 and a deflection roller 10 following in the direction of web travel 9.

Als Bahnspanneinrichtung 6 kann insbesondere eine Spannwalze in den Lauf der Materialbahn 1 gedrückt werden und/oder ein Blaselement Blasluft in den Lauf der Materialbahn 1 richten.In particular, a tension roller can be pressed into the course of the material web 1 as the web tensioning device 6 and/or a blowing element can direct blown air into the course of the material web 1 .

Um die Bahnspannungsprobleme insbesondere bei nach unten weisender Bahnoberseite zu minimieren, sollte die Verbindung zwischen den Materialbahnen 1 bei Stillstand der neuen Wickelrolle 7 oder bei einer Rotationsgeschwindigkeit der neuen Wickelrolle 7 der Primär-Abrolleinrichtung 3 erfolgen, die zwischen 0 und 1 m/s liegt.In order to minimize web tension problems, in particular when the upper side of the web points downwards, the connection between the material webs 1 should take place when the new winding roll 7 is stationary or at a rotational speed of the new winding roll 7 of the primary unwinding device 3, which is between 0 and 1 m/s.

Um die Übergabe der bereits überwiegend abgewickelten Wickelrolle 7 an die Sekundär-Abrolleinrichtung 4 zu vereinfachen, sind die beiden Wickelrollen-Antriebe auf unterschiedlichen Seiten der Maschine angeordnet. Konkret befindet sich der größere Antrieb der Primär-Abrolleinrichtung 3 für die volle Wickelrolle 7 auf der Maschinenseite und der kleinere Antrieb für die überwiegend abgewickelte Wickelrolle 7 der Sekundär-Abrolleinrichtung 4 auf der, für den Bediener zugänglichen Führerseite der Maschine.In order to simplify the transfer of the winding roll 7, which has already been largely unwound, to the secondary unwinding device 4, the two winding roll drives are arranged on different sides of the machine. Specifically, the larger drive of the primary unwinding device 3 for the full winding roll 7 is on the machine side and the smaller drive for the mostly unwound winding roll 7 of the secondary unwinding device 4 is on the driver's side of the machine, which is accessible to the operator.

Wesentlich ist dabei, dass der Antrieb der Sekundär-Abrolleinrichtung 4 nach der Übernahme bis zum Ende der Abwicklung mit der Wickelrolle 7 gekoppelt bleibt, d.h. die Abrollstation mit zwei Antrieben auskommt. Außerdem ist der größere Antrieb der Primär-Abrolleinrichtung 3 feststehend und nur der kleinere Antrieb verschiebbar, was die Konstruktion vereinfacht.It is essential that the drive of the secondary unwinding device 4 remains coupled to the winding roll 7 after the takeover until the end of the unwinding, ie the unwinding station manages with two drives. In addition, the larger drive of the primary unwinding device 3 is fixed and only the smaller drive is displaceable, which simplifies the construction.

Während des gesamten Prozesses wird der Bahnzug geregelt, was Wickelfehlern entgegenwirkt.The web tension is controlled throughout the process, which counteracts winding errors.

Claims (8)

  1. Method for unwinding a material web (1), in particular a paper or board web, with optional positioning of the material web (1) for a subsequent machine unit (2) for processing the material web (1), having an unwinding station which comprises a primary unwinding device (3) with a wound reel drive, at least one secondary unwinding device (4) and a gluing and separating device (5), wherein the wound reel (7) is first unwound in the primary unwinding device (3) and after its transfer is further unwound in a secondary unwinding device (4) and a new wound reel (7) is inserted into the primary unwinding device (3) and the gluing and cutting device (5) connects the material web (1) of the secondary unwinding device (4) to the material web (1) of the new wound reel (7) during a roll change and cuts the material web (1) running from the secondary unwinding device (4) to the splicing point, characterized in that the single secondary unwinding device (4) is arranged between the primary unwinding device (3) and the following machine unit (2), to change the position of the material web (1) the primary unwinding device (3) is driven to be unwound in a direction of rotation corresponding to the position, and the splice between the material webs (1) is made, in the case of an intended unwinding of the new wound reel (7) with the material web top side pointing downwards, when the new wound reel (7) of the primary unwinding device (3) is at a standstill or at a speed of rotation of the new wound reel (7) of the primary unwinding device (3) which is between 0 and 4 m/s.
  2. Method according to claim 1, characterized in that after the material web (1) has been cut, a drive of the secondary unwinding device (4) drives the wound reel (7) for winding up the web end remaining there against the unwinding direction.
  3. Method according to claim 1 or 2, characterized in that the connection between the material webs (1) is made when the new wound reel (7) of the primary unwinding device (3) is at a standstill.
  4. Method according to claim 1 or 2, characterized in that the connection between the material webs (1) takes place at a rotational speed of the new wound reel (7) of the primary unwinding device (3) which is between 0 and 4 m/s, preferably between 0 and 1 m/s.
  5. method according to one of the preceding claims, characterized in that a web tensioning method is initiated in the event of an intended unwinding of the new wound reel (7) with the top of the web facing downwards.
  6. Method according to claim 5, characterized in that, downstream of the primary unwinding device (3), a web tensioning device (6) in the form of a tensioning roll is pressed into the run of the material web (1) in order to increase the web tension.
  7. Method according to claim 5, characterized in that, downstream of the primary unwinding device (1), a web tensioning device (6) in the form of a blower element directs blown air into the run of the material web (1) in order to increase the web tension.
  8. Method according to claim 5, characterized in that the wound roll (7) of the primary unwinding device (3) is briefly driven in the opposite direction to increase the web tension.
EP18750432.9A 2017-08-11 2018-08-06 Unwinding station Active EP3665112B1 (en)

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DE102019111470B4 (en) * 2019-05-03 2022-06-02 Voith Patent Gmbh unwind station
DE102019111592A1 (en) * 2019-05-06 2020-11-12 Voith Patent Gmbh Material web processing

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GB685363A (en) * 1948-06-04 1953-01-07 Hoe & Co R Improvements in web printing machines
DE1250709B (en) * 1961-07-08 1967-09-21
US3971524A (en) * 1971-06-16 1976-07-27 Bayerische Berg-, Hutten- Und Salzwerke Ag Device for connecting an expiring first web of a web-shaped material with the beginning of a second web of a web shaped material
JPH03288759A (en) * 1990-04-04 1991-12-18 Sumitomo Metal Ind Ltd Winding-back control for coil-shaped extremely low tension sheet
JP2002274714A (en) * 2001-03-16 2002-09-25 Ishikawajima Harima Heavy Ind Co Ltd Tape position detector for frame changing of unwinder
FI121007B (en) * 2007-10-12 2010-06-15 Metso Paper Inc Method and arrangement in connection with a machine for unrolling a fiber web
DE102008022697A1 (en) * 2008-05-07 2009-12-10 Windmöller & Hölscher Kg Device and method for unwinding web-like material and web-processing machine
DE102012013459A1 (en) * 2012-07-04 2014-01-09 Windmöller & Hölscher Kg Device for unwinding sheet material
CN103738535B (en) * 2013-12-31 2016-04-06 北京航天东方科技发展有限公司 Automatic change film device in automatic filling clipper
CN204078994U (en) * 2014-09-23 2015-01-07 广东梅雁吉祥实业投资股份有限公司 A kind of new type auto film feeding mechanism
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CN110997533B (en) 2022-02-25
CN110997533A (en) 2020-04-10

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