EP2161130B1 - Transfer device - Google Patents

Transfer device Download PDF

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Publication number
EP2161130B1
EP2161130B1 EP09010151.0A EP09010151A EP2161130B1 EP 2161130 B1 EP2161130 B1 EP 2161130B1 EP 09010151 A EP09010151 A EP 09010151A EP 2161130 B1 EP2161130 B1 EP 2161130B1
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EP
European Patent Office
Prior art keywords
film
transfer
guide apparatus
web
roller
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Active
Application number
EP09010151.0A
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German (de)
French (fr)
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EP2161130A2 (en
EP2161130A3 (en
Inventor
Ulrike Dr. Plaia
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.)
Leonhard Kurz Stiftung and Co KG
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Leonhard Kurz Stiftung and Co KG
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Priority to PL09010151T priority Critical patent/PL2161130T3/en
Publication of EP2161130A2 publication Critical patent/EP2161130A2/en
Publication of EP2161130A3 publication Critical patent/EP2161130A3/en
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Publication of EP2161130B1 publication Critical patent/EP2161130B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F16/00—Transfer printing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F19/00—Apparatus or machines for carrying out printing operations combined with other operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2219/00—Printing presses using a heated printing foil
    • B41P2219/20—Arrangements for moving, supporting or positioning the printing foil
    • B41P2219/22—Guiding or tensioning the printing foil

Definitions

  • the invention relates to a device for transferring the transfer layer of a transfer film to an at least partially coated with an adhesive substrate.
  • Such a film transfer method and a sheet-fed rotary printing press by means of which this method is carried out, is described, for example, in US Pat EP 1 815 982 A2 described.
  • a first printing unit of the sheet-fed rotary printing machine is used to initially provide a printed sheet with a two-dimensional or imaging adhesive pattern.
  • a subsequent second printing unit is used to guide the signature together with the transfer sheet under pressure through a transfer nip.
  • the transfer nip is formed by a press roll and an impression cylinder. By means of the press roll, the printed sheet lying on the impression cylinder is brought into contact with the film material.
  • the downwardly lying transfer layer of the transfer film adheres in the areas provided with adhesive on the sheet, but not in the non-adhesive areas of the sheet.
  • the transfer layer of the transfer film remains in the regions of the printing sheet provided with the adhesive on the printing sheet and is pulled off the carrier foil of the transfer foil, whereas in the regions not provided with the adhesive, the transfer layer remains on the carrier foil.
  • the web tension in the area of the transfer gap is controlled by the film winding and film processing, which is designed for this purpose with individual drives or a drive-brake combination. Furthermore, the web tension can be changed by changing the wrap angle of the film web on the press roller of the transfer unit. Web tension changes are corrected by a "dancer".
  • the EP 1 790 601 A2 concerns the regulation of the web tension of a web.
  • a regulation is made on the web tension in order to keep it within an advantageous range for a processing quality of the web.
  • the material web is guided by means of two drive rollers via a measured value controller, and the measured values thus obtained are used to control the other drives.
  • the DE 20 2004 003 746 U1 describes a hot embossing apparatus in which a hot stamping film is moved outside the embossing phase at a speed slower than the printing speed.
  • the hot embossing device in this case has a supply roll, from which the film is withdrawn by means of a deduction device, wherein the deduction device is driven by a drive motor.
  • the film is then formed by an embossing cylinder on a counter-pressure cylinder Transfer gap supplied, and on both sides of the transfer nip a dancer unit is arranged, in which the dancer roll is adjustable by means of a servo motor. Subsequently, the film is removed via a further withdrawal unit and wound on an empty spool by means of an auxiliary motor.
  • the drawing units move the film at different speeds during the embossing phase and outside the embossing phase.
  • the expansion of the hot stamping foil is to be compensated by the heating during hot stamping.
  • the dancer rollers are controlled differently by the servomotors to realize said different speeds and to compensate for the elongation of the hot stamping foil by heating after passing through the nip.
  • the invention has for its object to achieve a safe and accurate transfer of a cold foil to a substrate.
  • a device for transferring the transfer layer of a transfer film to a substrate coated at least partially with an adhesive which has a transfer unit comprising a film transfer cylinder and an impression cylinder, which form a transfer nip for transferring the transfer layer of the transfer film to the adhesive coated with the adhesive Areas of the substrate, a Folienaufwickler for winding the transfer film on a film collecting roll and having a first and a second film guide means disposed on both sides of the transfer nip in the film web of the transfer film and each having at least one provided to provide a drive torque of the same roller over the the transfer film is guided, wherein the first film guiding device is arranged in the film web between a film supply roll and the transfer nip and the second film guiding device is arranged in the film web between the transfer nip and the film winder.
  • the invention achieves the advantage that the speed of the transfer film as well as the web tension of the transfer film in the area of the transfer nip can be adjusted more accurately and more quickly and thus the transfer of the transfer layer of a cold foil can be considerably improved.
  • the film speed and the web tension of the transfer film can be adjusted reliably and precisely, even when using different substrates or with clocked operation.
  • the driven rollers of the first and second film guiding devices are advantageous to arrange so that the web length of the transfer film between transfer nip and the nearest driven roller of the first and / or second film guide device is less than 50 cm, preferably less than 30 cm. Furthermore, the arrangement of the driven rollers is preferably selected so that the web length of the transfer film between the closest driven rollers of the first film guiding device under the second film guiding device is less than 80 cm, preferably less than 60 cm.
  • a further improvement of the transfer result is achieved in that the first and / or the second film guiding device has a variably adjustable spreader roller and / or a banana roller over which the transfer film is guided.
  • the variably adjustable spreader roller and / or the banana roller is arranged in the film web of the transfer film between the film supply roller and the at least one driven roller of the first film guide device or the at least one driven roller of the second film guide device and the film winder.
  • Spreader rollers and banana rollers are rollers in which the diameter of the roller is not constant over the length of the roller or having a curved or bendable axis, whereby the web tension and the web length along the width of the film web by the adjustment of the diameter or the adjustment of the curvature can be changed.
  • variably adjustable spreader rollers are used, the curvature of which can be changed mechanically, electrically or pneumatically.
  • the spreader rollers or banana rollers are also laterally adjustable horizontally.
  • these rollers are mounted horizontally movable and provided with a corresponding adjustment, which allows a laterally horizontal adjustment of the rollers and a fixation of the horizontal offset.
  • the device further comprises a control device for controlling the driven rollers of the first and second film guiding device.
  • this control device is not coupled with the control of the printing system.
  • the control device it is also possible for the control device to actuate the variably adjustable spreader roll or spreader rolls of the first and second film guiding device.
  • the control device controls the web tension applied in the region of the transfer nip by controlling the driven rollers of the film guiding device.
  • it preferably controls the Drive speed and / or the drive torque of the driven rollers of the film guide devices, for example by sending appropriate control signals to the drive means which drive the driven rollers of the film guide means.
  • the control device can control the contact pressure of the driven rollers for this purpose.
  • the control device can calculate the actual value of the web tension from the torques of the drive devices, which drive the at least one driven roller of the first film guide device and the at least one driven roller of the second film guide device.
  • control device calculates the actual value of the web tension from the drive speeds of the drive devices which drive the at least one driven roller of the first film guide device and the at least one driven roller of the second film guide device. Furthermore, it is also possible for the control device to detect the actual value of the web tension or of the web speed by means of the one or more encoders which detect the web tension or the web speed as the measured variable. By means of the actual values of the web tension and / or the web speed of the transfer film in the region of the transfer nip detected by one or more of the methods described above, the control device controls the actual value to a predetermined target value by the above-described activation of the driven rollers of the two film guiding devices. Value.
  • the adjustment of the web speed takes place here by a corresponding change in the drive speed of the driven rollers of the first and second film guiding device.
  • the Einreglung the web tension in the region of the transfer nip takes place here by changing the drive speed of the driven rollers such that by a different drive speed or a different torque, the web tension is increased or decreased.
  • the first and / or second film guide device is attached to the outside of the housing of the transfer unit.
  • the first and the second film guiding device are preferably additional modules which are subsequently attached to the printing system and improve the transfer process without interfering with the control of the printing system. This provides a particularly cost-effective and flexible way to improve the transfer of a cold foil in a printing system.
  • Fig. 1 shows parts of a printing system 1, which may be a sheet-fed rotary printing press or a web-fed printing press.
  • the printing system 1 has a plurality of printing units, of which in Fig. 1 three printing units 11, 12 and 13 are indicated.
  • the printing unit 11 is used as a commissioned work, which is the substrate to be printed in the printing system 1, for example, the signatures or the paper web, with a flat patterned adhesive pattern provides.
  • the printing unit 11 may be, for example, an offset printing unit comprising, for example, an inking unit, a blanket cylinder and an impression cylinder.
  • the thus provided with a patterned adhesive coating substrate is fed to the printing unit 12 in the printing system 1.
  • the printing unit 12 is used as a transfer unit for transferring the transfer layer of a cold foil to the substrate.
  • a printing cylinder 21 which is used as a film transfer cylinder, and a counter-pressure cylinder 22 is shown.
  • the film transfer cylinder 21 and the impression cylinder 22 form a transfer nip, which is used to transfer the transfer layer of a transfer film 4 on the coated with the adhesive areas of the in Fig. 1 indicated substrate 5 is used.
  • the printing system 1 further comprises a film unwinder 23, a film winder 24, a dancer roller 29, a film guide device 31, a film guide device 32 and a control device 33.
  • the film unwinder 23 unwinds the transfer film 4 from a film supply roll 25.
  • the film unwinder 23 has for this purpose a corresponding rotary drive 26, which drives the film supply roll 25.
  • the Folienaufwickler 24 winds the embossed transfer film 4 on the film collection roller 27 and also has a rotary drive 28, which drives the film collecting roller 27.
  • the rotary actuators 26 and 28 are synchronized with each other by the printing system 1 and controlled in synchronism with the drive speed of the transfer cylinder 21. Further, it is also possible to dispense with the rotary drive 26 or to replace the rotary drive 26 by a braking device.
  • the film guiding devices 31 and 32 are, as in FIG Fig. 1 indicated, attached to the outside of the housing of the transfer unit 12.
  • the film guide device 31 has a spreader roll 36, a counterpressure roll 34 and a press roll 35.
  • the film guiding device 32 has a press roll 38, a counterpressure roll 37, a spreader roll 39 and a guide roll 40.
  • the press rollers 35 and 38 are each driven by an associated drive device, which is controlled by the control device 33, as shown in FIG Fig. 1 is indicated.
  • the transfer film 4 is unwound from the film unwinder 23 from the film supply roll 25 and fed via the dancer roller 29 of the film guide device 31.
  • the transfer film 4 is first passed over the spreader roller 36 and then over the press roller 35.
  • the film guiding device 31, in addition to the spreader roll 36 to have a further spreader roll or a banana roll over which the transfer film is guided.
  • the film guiding device 31 it is also possible for the film guiding device 31 to have not only a driven press roll but a plurality of driven rolls over which the transfer film 4 is guided.
  • the transfer film 4 passes through the transfer nip formed by the transfer cylinder 21 and the impression cylinder 22 and is thereby pressed by the transfer cylinder 21 and the impression cylinder 22 with a predefined force against the also guided through the transfer nip substrate 5.
  • the transfer layer of the transfer film 4 adheres to the substrate.
  • these areas of the transfer layer of the transfer film 4 thus remain on the substrate 5 and are thus removed from the carrier film of the transfer film 4.
  • the transfer layer of the transfer film 4 remains on the carrier film of the transfer film and is transported away with this.
  • the transfer film 4 passes through the film guiding device 32 and is guided there over the press roll 38 and the spreader roll 39 and then wound up by the rewinder 24 onto the film collecting roll 27. It is advantageous if the transfer film 4 after passing through the film guide device 32 via a (in Fig. 1 not shown) dancer roll is performed so as to compensate for any Bruzugschwankept.
  • the control device 33 includes one or more processors, a memory device and peripheral modules, which enable the actuation of the drives of the film guiding devices 31 and 32. Furthermore, the control device 33 comprises a control program which, in cooperation with the hardware components described above, performs the functions of the control device 33 described below:
  • the control device 33 controls the drives of the press rolls 35 and 38 so as to control the web tension and / or web speed present in the region of the transfer nip.
  • the control device 33 detects the web tension of the transfer film in the region of the transfer nip and / or the web speed of the transfer film in the region of the transfer nip by appropriate encoders, for example measuring rollers, which are mechanically coupled to an inductive, capacitive or optical rotary encoder.
  • control device 33 calculates the actual values of the web tension or the web speed based on the drive speed or the drive torque of the press rollers 35 and 38 or the drive devices which drive these rollers.
  • the control device 33 uses the actual values thus determined by means of transducers or by calculation as input parameters of a control algorithm which adjusts these actual works to predetermined desired values by controlling the rollers 38 and 35.
  • control device 33 changes the drive speed of the press rolls 35 and 38 such that the web train speeds of the film guide devices 31 and 32 are slightly different and the web tension in the area of the transfer nip increases or decreases. Furthermore, it is also possible that the control device 33 does not control the drive speed, but the drive torque, by means of which the press rollers 35 and 38 are driven.
  • the film guide means 31 and 32 as close as possible to the transfer nip are arranged and so the web length between the closest driven rollers of the film guide means 31 and 32 is as small as possible 80 cm, preferably smaller than 60 cm.
  • the spreader rolls 36 and 39 are preferably mechanically, pneumatically or electrically adjustable spreader rolls, wherein the spreader roll 39 can also be dispensed with.
  • the curvature of the spreader roll 36 is adjusted by an operator, but preferably by the control device 33, so that the transfer film 4 enters the press nip between the press roll 34 and the counterpressure roll 35 with a web tension that is as uniform as possible over its width.
  • the bearing points of the spreader roller 36 are mounted horizontally adjustable, so that diagonal trains of the transfer film can be corrected by not given parallelism of front guide rollers. This correction is also preferably controlled by the control device 33.
  • the incoming in the press nip between the press roller 35 and the platen 34 transfer sheet 4 by an optical sensor, such as a camera, detected and then by means of a control loop, the curvature of the spreader roller 36 and the Position whose bearing points adjusted so that the film tension over the width of the transfer film 4 is constant and the transfer film enters the press nip without diagonal pull.
  • an optical sensor such as a camera
  • the spreader roller 39 of the film guide device 32 can be configured and controlled.
  • a variably adjustable spreader roll and a banana roll can be used.

Description

Die Erfindung betrifft eine Vorrichtung zum Transfer der Übertragungslage einer Transferfolie auf ein zumindest partiell mit einem Kleber beschichtetes Substrat.The invention relates to a device for transferring the transfer layer of a transfer film to an at least partially coated with an adhesive substrate.

Es ist bekannt, dekorative Schichten auf Druckbögen mittels eines Folientransferverfahrens herzustellen, bei dem in einem ersten Schritt mittels eines Druckwerks auf den Druckbogen ein Klebstoffmuster aufgetragen wird und sodann in einem Transferwerk die Übertragungslage einer Transferfolie auf die mit dem Kleber beschichteten Bereiche des Druckbogens transferiert wird. Die hierzu verwenden Transferfolien werden üblicherweise als Kaltfolien bezeichnet.It is known to produce decorative layers on signatures by means of a film transfer process, in which in a first step a print pattern is applied to the printing sheet, and then the transfer layer of a transfer film is transferred to the areas of the printed sheet coated with the adhesive in a transfer unit. The transfer films used for this purpose are usually referred to as cold foils.

Ein derartiges Folientransferverfahren und eine Bogenrotationsdruckmaschine, mittels der dieses Verfahren durchgeführt wird, wird beispielsweise in der EP 1 815 982 A2 beschrieben. Hier wird ein erstes Druckwerk der Bogenrotationsdruckmaschine dazu verwendet, einen Druckbogen zunächst mit einem flächigen oder bildgebenden Klebstoffmuster zu versehen. Ein nachfolgendes zweites Druckwerk wird dazu verwendet, um dem Druckbogen gemeinsam mit der Transferfolie unter Pressung durch einen Transferspalt zu führen. Der Transferspalt wird von einer Presswalze und einem Gegendruckzylinder gebildet. Mittels der Presswalze wird der auf dem Gegendruckzylinder aufliegende Druckbogen mit dem Folienmaterial in Verbindung gebracht. Dabei haftet die nach unten liegende Transferlage der Transferfolie in den mit Klebstoff versehenen Bereichen auf dem Druckbogen an, nicht jedoch in den nicht mit Klebstoff versehenen Bereichen des Druckbogens. Beim Abführen des Druckbogens aus dem Transferspalt verbleibt die Transferlage der Transferfolie in den mit dem Klebstoff versehenen Bereichen des Druckbogens auf dem Druckbogen und wird von der Trägerfolie der Transferfolie abgezogen, wohingegen in den nicht mit dem Klebstoff versehenen Bereichen die Transferlage auf der Trägerfolie verbleibt.Such a film transfer method and a sheet-fed rotary printing press, by means of which this method is carried out, is described, for example, in US Pat EP 1 815 982 A2 described. Here, a first printing unit of the sheet-fed rotary printing machine is used to initially provide a printed sheet with a two-dimensional or imaging adhesive pattern. A subsequent second printing unit is used to guide the signature together with the transfer sheet under pressure through a transfer nip. The transfer nip is formed by a press roll and an impression cylinder. By means of the press roll, the printed sheet lying on the impression cylinder is brought into contact with the film material. In this case, the downwardly lying transfer layer of the transfer film adheres in the areas provided with adhesive on the sheet, but not in the non-adhesive areas of the sheet. When the printing sheet is removed from the transfer nip, the transfer layer of the transfer film remains in the regions of the printing sheet provided with the adhesive on the printing sheet and is pulled off the carrier foil of the transfer foil, whereas in the regions not provided with the adhesive, the transfer layer remains on the carrier foil.

Um die Bogenrotationsdruckmaschine flexibel auf unterschiedliche Bedruckstoffe, beispielsweise aus Papier oder Karton, einstellen zu können, wird hierbei vorgeschlagen, die Bahnzugkraft im Bereich des Transferspalts zu verändern. Die Bahnzugsspannung wird hierbei über die Folienaufwicklung und Folienabwicklung gesteuert, die hierzu mit einzelnen Antrieben oder einer Antriebs-Brems-Kombination ausgeführt ist. Weiterhin kann die Bahnzugspannung durch eine Veränderung des Umschlingungswinkels der Folienbahn an der Presswalze des Transferwerks verändert werden. Bahnspannungsänderungen werden durch einen "Tänzer" korrigiert.In order to be able to adjust the sheet-fed rotary printing press flexibly to different substrates, for example of paper or cardboard, In this case, it is proposed to change the web tension in the area of the transfer gap. The web tension is controlled by the film winding and film processing, which is designed for this purpose with individual drives or a drive-brake combination. Furthermore, the web tension can be changed by changing the wrap angle of the film web on the press roller of the transfer unit. Web tension changes are corrected by a "dancer".

Es hat sich jedoch gezeigt, dass es bei dieser Vorgehensweise nur schwer möglich ist, einen gleichmäßigen Einzug der Kaltfolie ohne Faltenbildung in den Transferspalt zum Transfer der Kaltfolienschichten auf das Substrat zu erzielen.However, it has been found that it is difficult with this approach to achieve a uniform collection of cold foil without wrinkling in the transfer nip for transferring the cold foil layers on the substrate.

Die EP 1 790 601 A2 betrifft die Regelung der Bahnspannung einer Warenbahn. Hierbei erfolgt eine Regelung auf die Bahnspannung, um diese innerhalb eines für eine Bearbeitungsqualität der Warenbahn vorteilhaften Bereiches zu halten. Die Warenbahn wird mithilfe zweier Antriebswalzen über einen Messwertregler geführt, und die so gewonnenen Messwerte werden genutzt, um die anderen Antriebe zu regeln.The EP 1 790 601 A2 concerns the regulation of the web tension of a web. In this case, a regulation is made on the web tension in order to keep it within an advantageous range for a processing quality of the web. The material web is guided by means of two drive rollers via a measured value controller, and the measured values thus obtained are used to control the other drives.

Die DE 20 2004 003 746 U1 beschreibt eine Heißprägevorrichtung, bei der eine Heißprägefolie außerhalb der Prägephase mit einer geringeren Geschwindigkeit als der Druckgeschwindigkeit bewegt wird. Die Heißprägevorrichtung weist hierbei eine Vorratsrolle auf, von der die Folie mittels einer Abzugeinrichtung abgezogen wird, wobei die Abzugeinrichtung durch einen Antriebsmotor angetrieben wird. Die Folie wird sodann einem von einem Prägezylinder an einem Gegendruckzylinder gebildeten Transferspalt zugeführt, und beidseitig des Transferspaltes ist jeweils eine Tänzereinheit angeordnet, bei der die Tänzerrolle mittels eines Servomotors verstellbar ist. Anschließend wird die Folie über eine weitere Abzugseinheit abgezogen und auf eine Leerspule mittels eines Hilfsmotors aufgespult. Es wird ausgeführt, dass die Abzugseinheiten die Folie in der Prägephase und außerhalb der Prägephase mit unterschiedlichen Geschwindigkeiten bewegen. Hierdurch soll die Ausdehnung der Heißprägefolie durch die Erwärmung beim Heißprägen ausgeglichen werden. Ferner werden die Tänzerrollen durch die Servomotoren unterschiedlich gesteuert, um die genannten unterschiedlichen Geschwindigkeiten zu realisieren und die Verlängerung der Heißprägefolie durch Erwärmen nach Durchlaufen des Druckspaltes auszugleichen.The DE 20 2004 003 746 U1 describes a hot embossing apparatus in which a hot stamping film is moved outside the embossing phase at a speed slower than the printing speed. The hot embossing device in this case has a supply roll, from which the film is withdrawn by means of a deduction device, wherein the deduction device is driven by a drive motor. The film is then formed by an embossing cylinder on a counter-pressure cylinder Transfer gap supplied, and on both sides of the transfer nip a dancer unit is arranged, in which the dancer roll is adjustable by means of a servo motor. Subsequently, the film is removed via a further withdrawal unit and wound on an empty spool by means of an auxiliary motor. It is stated that the drawing units move the film at different speeds during the embossing phase and outside the embossing phase. As a result, the expansion of the hot stamping foil is to be compensated by the heating during hot stamping. Further, the dancer rollers are controlled differently by the servomotors to realize said different speeds and to compensate for the elongation of the hot stamping foil by heating after passing through the nip.

Der Erfindung liegt die Aufgabe zugrunde, einen sicheren und exakten Transfer einer Kaltfolie auf ein Substrat zu erzielen.The invention has for its object to achieve a safe and accurate transfer of a cold foil to a substrate.

Diese Aufgabe wird durch eine Vorrichtung zum Transfer der Übertragungslage einer Transferfolie auf ein zumindest partiell mit einem Kleber beschichtetes Substrat gelöst, welche ein Transferwerk umfassend einen Folientransferzylinder und einen Gegendruckzylinder aufweist, die einen Transferspalt ausbilden zur Übertragung der Übertragungslage der Transferfolie auf die mit dem Kleber beschichteten Bereiche des Substrats, einen Folienaufwickler zur Aufwicklung der Transferfolie auf eine Foliensammelrolle aufweist und eine erste und eine zweite Folienführungseinrichtung aufweist, die beidseits des Transferspaltes in der Folienbahn der Transferfolie angeordnet sind und die jeweils zumindest eine unter Bereitstellung eines Antriebsmoments derselben angetriebene Walze aufweisen, über die die Transferfolie geführt wird, wobei die erste Folienführungseinrichtung in der Folienbahn zwischen einer Folienvorratsrolle und dem Transferspalt und die zweite Folienführungseinrichtung in der Folienbahn zwischen dem Transferspalt und dem Folienaufwickler angeordnet ist.This object is achieved by a device for transferring the transfer layer of a transfer film to a substrate coated at least partially with an adhesive, which has a transfer unit comprising a film transfer cylinder and an impression cylinder, which form a transfer nip for transferring the transfer layer of the transfer film to the adhesive coated with the adhesive Areas of the substrate, a Folienaufwickler for winding the transfer film on a film collecting roll and having a first and a second film guide means disposed on both sides of the transfer nip in the film web of the transfer film and each having at least one provided to provide a drive torque of the same roller over the the transfer film is guided, wherein the first film guiding device is arranged in the film web between a film supply roll and the transfer nip and the second film guiding device is arranged in the film web between the transfer nip and the film winder.

Durch die Erfindung wird der Vorteil erzielt, dass die Geschwindigkeit der Transferfolie sowie die Bahnzugspannung der Transferfolie im Bereich des Transferspaltes genauer und schneller eingeregelt werden kann und damit der Transfer der Übertragungslage einer Kaltfolie erheblich verbessert werden kann. Durch die Ansteuerung der beiden benachbart zum Transferspalt angetriebenen Walzen der Folienführungseinrichtungen kann die Foliengeschwindigkeit und die Bahnzugspannung der Transferfolie sicher und exakt eingeregelt werden, auch bei Verwendung unterschiedlicher Bedruckstoffe oder bei getaktetem Betrieb.The invention achieves the advantage that the speed of the transfer film as well as the web tension of the transfer film in the area of the transfer nip can be adjusted more accurately and more quickly and thus the transfer of the transfer layer of a cold foil can be considerably improved. By controlling the two rollers of the film guiding devices, which are driven adjacent to the transfer nip, the film speed and the web tension of the transfer film can be adjusted reliably and precisely, even when using different substrates or with clocked operation.

Als besonders vorteilhaft hat es sich hierbei erwiesen, die angetriebenen Walzen der Folienführungseinrichtung, welche zur Regelung der Bahngeschwindigkeit und der Bahnzugspannung der Transferfolie im Transferspalt verwendet werden, möglichst nahe am Transferspalt anzuordnen. Untersuchungen haben überraschend gezeigt, dass die Bahnlänge zwischen den angetriebenen Walzen und dem Transferspalt einen erheblichen Einfluss auf das Transferergebnis hat. So verringert sich beispielsweise der Einfluss, der das mechanische Verziehen der Folie auf das Transferergebnis hat, erheblich, wenn die angetriebenen Walzen der Folienführungseinrichtungen möglichst nahe am Transferspalt angeordnet sind. Vorteilhaft ist es, die angetriebenen Walzen der ersten und zweiten Folienführungseinrichtungen so anzuordnen, dass die Bahnlänge der Transferfolie zwischen Transferspalt und der nächstgelegenen angetriebenen Walze der ersten und/oder zweiten Folienführungseinrichtung kleiner als 50 cm, vorzugsweise kleiner als 30 cm ist. Weiter wird die Anordnung der angetriebenen Walzen vorzugsweise so gewählt, dass die Bahnlänge der Transferfolie zwischen den sich am nächsten liegenden angetriebenen Walzen der ersten Folienführungseinrichtung unter der zweiten Folienführungseinrichtung kleiner als 80 cm, vorzugsweise kleiner als 60 cm ist.It has proved to be particularly advantageous in this case to arrange the driven rollers of the film guiding device, which are used to control the web speed and the web tension of the transfer film in the transfer nip, as close as possible to the transfer nip. Investigations have surprisingly shown that the web length between the driven rollers and the transfer nip has a considerable influence on the transfer result. Thus, for example, the influence which the mechanical distortion of the film has on the transfer result is considerably reduced if the driven rollers of the film guiding devices are arranged as close as possible to the transfer nip. It is advantageous to arrange the driven rollers of the first and second film guiding devices so that the web length of the transfer film between transfer nip and the nearest driven roller of the first and / or second film guide device is less than 50 cm, preferably less than 30 cm. Furthermore, the arrangement of the driven rollers is preferably selected so that the web length of the transfer film between the closest driven rollers of the first film guiding device under the second film guiding device is less than 80 cm, preferably less than 60 cm.

Eine weitere Verbesserung des Transferergebnisses wird dadurch erzielt, dass die erste und/oder die zweite Folienführungseinrichtung eine variabel einstellbare Breitstreckwalze und/oder eine Bananenwalze aufweist, über die die Transferfolie geführt wird. Die variabel einstellbare Breitstreckwalze und/oder die Bananenwalze wird in der Folienbahn der Transferfolie zwischen Folienvorratswalze und der mindestens einen angetriebenen Walze der ersten Folienführungseinrichtung bzw. der mindestens einen angetriebenen Walze der zweiten Folienführungseinrichtung und dem Folienaufwickler angeordnet. Durch diese Maßnahme wird erzielt, dass die Transferfolie möglichst gleichmäßig und ohne Falten in den Transferspalt zum Transfer der Übertragungslage eingezogen wird. Durch die Verwendung dieser Walzen wird die Folienspannung über die Breite der Walzen so geregelt, dass die Folienspannung einen gleichmäßigen Verlauf über die Breite der Folie besitzt. Weiter können hierdurch Schrägzüge aufgrund von einer nicht durchgehenden Planparallelität vorgehender Umlenkwalzen korrigiert werden. Dies wird insbesondere durch eine horizontale Verstellmöglichkeit dieser Walzen erzielt.A further improvement of the transfer result is achieved in that the first and / or the second film guiding device has a variably adjustable spreader roller and / or a banana roller over which the transfer film is guided. The variably adjustable spreader roller and / or the banana roller is arranged in the film web of the transfer film between the film supply roller and the at least one driven roller of the first film guide device or the at least one driven roller of the second film guide device and the film winder. By this measure it is achieved that the transfer film is fed as evenly as possible and without wrinkles in the transfer nip for transfer of the transfer layer. By using these rollers, the film tension over the width of the rollers is controlled so that the film tension has a uniform course across the width of the film. Furthermore, this makes it possible to correct diagonal pulls due to a non-continuous plane parallelism of preceding guide rollers. This is achieved in particular by a horizontal adjustment of these rollers.

Unter Breitstreckwalzen und Bananenwalzen werden Walzen verstanden, bei denen der Durchmesser der Walze über die Länge der Walze nicht konstant ist oder die eine gekrümmte oder krümmbare Achse aufweisen, wodurch die Bahnzugspannung und die Bahnlänge entlang der Breite der Folienbahn durch die Einstellung des Durchmessers bzw. die Einstellung der Krümmung verändert werden kann. Vorzugsweise werden hierbei variabel einstellbare Breitstreckwalzen verwendet, deren Krümmung mechanisch, elektrisch oder pneumatisch verändert werden kann. Vorzugsweise sind die Breitstreckwalzen oder Bananenwalzen auch noch seitlich horizontal verstellbar. Vorzugsweise sind diese Walzen hierbei horizontal beweglich gelagert und mit einer entsprechenden Verstelleinrichtung versehen, die eine seitlich horizontale Verstellung der Walzen sowie eine Fixierung des horizontalen Versatzes ermöglicht. Durch diese Maßnahmen kann eine nicht gegebene Planparallelität vorgehender Umlenkwalzen korrigiert werden und ein gleichmäßiger Zug der Folienspannung über die Breite der Transferfolie im Transferspalt eingeregelt werden.Spreader rollers and banana rollers are rollers in which the diameter of the roller is not constant over the length of the roller or having a curved or bendable axis, whereby the web tension and the web length along the width of the film web by the adjustment of the diameter or the adjustment of the curvature can be changed. Preferably variably adjustable spreader rollers are used, the curvature of which can be changed mechanically, electrically or pneumatically. Preferably, the spreader rollers or banana rollers are also laterally adjustable horizontally. Preferably, these rollers are mounted horizontally movable and provided with a corresponding adjustment, which allows a laterally horizontal adjustment of the rollers and a fixation of the horizontal offset. By means of these measures, it is possible to correct a non-given plane parallelism of preceding deflection rollers and to regulate a uniform tension of the film tension across the width of the transfer film in the transfer nip.

Gemäss einer bevorzugten Ausführungsform der Erfindung weist die Vorrichtung weiter eine Steuereinrichtung zur Ansteuerung der angetriebenen Walzen der ersten und zweiten Folienführungseinrichtung auf. Vorzugsweise ist diese Steuereinrichtung hierbei nicht mit der Steuerung des Drucksystems gekoppelt. Eine derartige Kopplung und ein Austausch von Daten mit der Steuerung des Drucksystems ist jedoch möglich. Weiter ist es auch möglich, dass die Steuereinrichtung die variabel einstellbare Breitstreckwalze oder Breitstreckwalzen der ersten und zweiten Folienführungseinrichtung ansteuert.According to a preferred embodiment of the invention, the device further comprises a control device for controlling the driven rollers of the first and second film guiding device. Preferably, this control device is not coupled with the control of the printing system. However, such coupling and exchange of data with the control of the printing system is possible. Furthermore, it is also possible for the control device to actuate the variably adjustable spreader roll or spreader rolls of the first and second film guiding device.

Die Steuereinrichtung regelt hierbei die im Bereich des Übertragungsspaltes anliegende Bahnzugspannung durch Ansteuerung der angetriebenen Walzen der Folienführungseinrichtung. Hierzu steuert sie vorzugsweise die Antriebsgeschwindigkeit und/oder das Antriebsmoment der angetriebenen Walzen der Folienführungseinrichtungen, beispielsweise indem sie entsprechende Steuersignale an die Antriebseinrichtungen sendet, die die angetriebenen Walzen der Folienführungseinrichtungen antreiben. Weiter ist es auch möglich, dass die Steuereinrichtung hierzu den Anpressdruck der angetriebenen Walzen steuert. Die Steuereinrichtung kann hierbei den Ist-Wert der Bahnzugspannung aus den Drehmomenten der Antriebseinrichtungen berechnen, welche die mindestens eine angetriebene Walze der ersten Folienführungseinrichtung und die mindestens eine angetriebene Walze der zweiten Folienführungseinrichtung antreiben. Vorteilhaft ist es weiter, dass die Steuereinrichtung den Ist-Wert der Bahnzugspannung aus den Antriebsgeschwindigkeiten der Antriebseinrichtungen berechnet, welche die mindestens eine angetriebene Walze der ersten Folienführungseinrichtung und die mindestens eine angetriebene Walze der zweiten Folienführungseinrichtung antreiben. Weiter ist es auch möglich, dass die Steuereinrichtung den Ist-Wert der Bahnzugspannung oder der Bahngeschwindigkeit mittels der ein oder mehreren Messgeber erfasst, die als Messgröße die Bahnzugspannung oder die Bahngeschwindigkeit erfassen. Mittels der durch ein oder mehrere der oben beschriebenen Verfahren erfassten Ist-Werte der Bahnzugspannung und/oder der Bahngeschwindigkeit der Transferfolie im Bereich des Transferspaltes regelt die Steuereinrichtung durch die oben beschriebene Ansteuerung der angetriebenen Walzen der beiden Folienführungseinrichtungen den Ist-Wert auf einen vorgegebenen Soll-Wert ein. Die Einregelung der Bahngeschwindigkeit erfolgt hierbei durch entsprechende Veränderung der Antriebsgeschwindigkeit der angetriebenen Walzen der ersten und zweiten Folienführungseinrichtung. Die Einreglung der Bahnzugspannung im Bereich des Transferspaltes erfolgt hierbei durch Veränderung der Antriebsgeschwindigkeit der angetriebenen Walzen derart, dass durch eine unterschiedliche Antriebsgeschwindigkeit oder ein unterschiedliches Drehmoment die Bahnzugspannung erhöht oder verringert wird.In this case, the control device controls the web tension applied in the region of the transfer nip by controlling the driven rollers of the film guiding device. For this purpose, it preferably controls the Drive speed and / or the drive torque of the driven rollers of the film guide devices, for example by sending appropriate control signals to the drive means which drive the driven rollers of the film guide means. Furthermore, it is also possible for the control device to control the contact pressure of the driven rollers for this purpose. In this case, the control device can calculate the actual value of the web tension from the torques of the drive devices, which drive the at least one driven roller of the first film guide device and the at least one driven roller of the second film guide device. It is furthermore advantageous that the control device calculates the actual value of the web tension from the drive speeds of the drive devices which drive the at least one driven roller of the first film guide device and the at least one driven roller of the second film guide device. Furthermore, it is also possible for the control device to detect the actual value of the web tension or of the web speed by means of the one or more encoders which detect the web tension or the web speed as the measured variable. By means of the actual values of the web tension and / or the web speed of the transfer film in the region of the transfer nip detected by one or more of the methods described above, the control device controls the actual value to a predetermined target value by the above-described activation of the driven rollers of the two film guiding devices. Value. The adjustment of the web speed takes place here by a corresponding change in the drive speed of the driven rollers of the first and second film guiding device. The Einreglung the web tension in the region of the transfer nip takes place here by changing the drive speed of the driven rollers such that by a different drive speed or a different torque, the web tension is increased or decreased.

Gemäß eines bevorzugten Ausführungsbeispiels ist die erste und/oder zweite Folienführungseinrichtung an der Außenseite des Gehäuses des Transferwerks befestigt. Bei der ersten und der zweiten Folienführungseinrichtung handelt es sich vorzugsweise um nachträglich an dem Drucksystem befestigte Zusatzmodule, die den Transferprozess verbessern, ohne in die Steuerung des Drucksystems einzugreifen. Hierdurch wird eine besonders kostengünstige und flexible Möglichkeit geschaffen, den Transfer einer Kaltfolie in einem Drucksystem zu verbessern.According to a preferred embodiment, the first and / or second film guide device is attached to the outside of the housing of the transfer unit. The first and the second film guiding device are preferably additional modules which are subsequently attached to the printing system and improve the transfer process without interfering with the control of the printing system. This provides a particularly cost-effective and flexible way to improve the transfer of a cold foil in a printing system.

Im Folgenden wird die Erfindung anhand von mehreren Ausführungsbeispielen beispielhaft erläutert.

Fig. 1
zeigt ein Drucksystem mit einer erfindungsgemäßen Vorrichtung.
In the following, the invention will be explained by way of example with reference to several exemplary embodiments.
Fig. 1
shows a printing system with a device according to the invention.

Fig. 1 zeigt Teile eines Drucksystems 1, bei dem es sich um eine Bogenrotationsdruckmaschine oder um eine Rollendruckmaschine handeln kann. Das Drucksystems 1 weist mehrere Druckwerke auf, von denen in Fig. 1 drei Druckwerke 11, 12 und 13 angedeutet sind. Fig. 1 shows parts of a printing system 1, which may be a sheet-fed rotary printing press or a web-fed printing press. The printing system 1 has a plurality of printing units, of which in Fig. 1 three printing units 11, 12 and 13 are indicated.

Das Druckwerk 11 wird als Auftragswerk eingesetzt, welches das in dem Drucksystem 1 zu bedruckende Substrat, beispielsweise die Druckbögen oder die Papierbahn, mit einem flächigen musterförmigen Klebstoffmuster versieht. Bei dem Druckwerk 11 kann es sich beispielsweise um ein Offset-Druckwerk handeln, umfassend beispielsweise ein Farbwerk, einen Drucktuchzylinder und einen Gegendruckzylinder.The printing unit 11 is used as a commissioned work, which is the substrate to be printed in the printing system 1, for example, the signatures or the paper web, with a flat patterned adhesive pattern provides. The printing unit 11 may be, for example, an offset printing unit comprising, for example, an inking unit, a blanket cylinder and an impression cylinder.

Das so mit einem musterförmigen Klebstoffauftrag versehene Substrat wird in dem Drucksystem 1 dem Druckwerk 12 zugeführt. Das Druckwerk 12 wird als Transferwerk zur Transferierung der Übertragungslage einer Kaltfolie auf das Substrat verwendet.The thus provided with a patterned adhesive coating substrate is fed to the printing unit 12 in the printing system 1. The printing unit 12 is used as a transfer unit for transferring the transfer layer of a cold foil to the substrate.

Von den Komponenten des Druckwerks 12 sind in Fig. 1 ein Druckzylinder 21, der als Folientransferzylinder verwendet wird, sowie ein Gegendruckzylinder 22 gezeigt. Wie in Fig. 1 angedeutet, bilden der Folientransferzylinder 21 und der Gegendruckzylinder 22 einen Transferspalt aus, der zur Übertragung der Übertragungslage einer Transferfolie 4 auf die mit dem Kleber beschichteten Bereiche des in Fig. 1 angedeuteten Substrats 5 dient.Of the components of the printing unit 12 are in Fig. 1 a printing cylinder 21, which is used as a film transfer cylinder, and a counter-pressure cylinder 22 is shown. As in Fig. 1 indicated, the film transfer cylinder 21 and the impression cylinder 22 form a transfer nip, which is used to transfer the transfer layer of a transfer film 4 on the coated with the adhesive areas of the in Fig. 1 indicated substrate 5 is used.

Das Drucksystem 1 weist weiter einen Folienabwickler 23, einen Folienaufwickler 24, eine Tänzerwalze 29, eine Folienführungseinrichtung 31, eine Folienführungseinrichtung 32 und eine Steuereinrichtung 33 auf.The printing system 1 further comprises a film unwinder 23, a film winder 24, a dancer roller 29, a film guide device 31, a film guide device 32 and a control device 33.

Der Folienabwickler 23 wickelt die Transferfolie 4 von einer Folienvorratsrolle 25 ab. Der Folienabwickler 23 verfügt hierzu über einen entsprechenden Drehantrieb 26, welcher die Folienvorratsrolle 25 antreibt. Der Folienaufwickler 24 wickelt die abgeprägte Transferfolie 4 auf die Foliensammelrolle 27 auf und verfügt ebenfalls über einen Drehantrieb 28, welcher die Foliensammelrolle 27 antreibt. Die Drehantriebe 26 und 28 werden von dem Drucksystem 1 entsprechend miteinander synchronisiert und synchronisiert mit der Antriebsgeschwindigkeit des Transferzylinders 21 gesteuert. Weiter ist es auch möglich, auf den Drehantrieb 26 zu verzichten oder den Drehantrieb 26 durch eine Bremsvorrichtung zu ersetzen.The film unwinder 23 unwinds the transfer film 4 from a film supply roll 25. The film unwinder 23 has for this purpose a corresponding rotary drive 26, which drives the film supply roll 25. The Folienaufwickler 24 winds the embossed transfer film 4 on the film collection roller 27 and also has a rotary drive 28, which drives the film collecting roller 27. The rotary actuators 26 and 28 are synchronized with each other by the printing system 1 and controlled in synchronism with the drive speed of the transfer cylinder 21. Further, it is also possible to dispense with the rotary drive 26 or to replace the rotary drive 26 by a braking device.

Die Folienführungseinrichtungen 31 und 32 sind, wie in Fig. 1 angedeutet, an der Außenseite des Gehäuses des Transferwerks 12 befestigt. Die Folienführungseinrichtung 31 weist eine Breitstreckwalze 36, eine Gegendruckwalze 34 und eine Presswalze 35 auf. Die Folienführungseinrichtung 32 weist eine Presswalze 38, eine Gegendruckwalze 37, eine Breitstreckwalze 39 und eine Leitwalze 40 auf. Die Presswalzen 35 und 38 werden jeweils von einer zugeordneten Antriebseinrichtung angetrieben, die von der Steuereinrichtung 33 angesteuert ist, wie dies in Fig. 1 angedeutet ist.The film guiding devices 31 and 32 are, as in FIG Fig. 1 indicated, attached to the outside of the housing of the transfer unit 12. The film guide device 31 has a spreader roll 36, a counterpressure roll 34 and a press roll 35. The film guiding device 32 has a press roll 38, a counterpressure roll 37, a spreader roll 39 and a guide roll 40. The press rollers 35 and 38 are each driven by an associated drive device, which is controlled by the control device 33, as shown in FIG Fig. 1 is indicated.

Die Transferfolie 4 wird von dem Folienabwickler 23 von der Folienvorratsrolle 25 abgewickelt und über die Tänzerrolle 29 der Folienführungseinrichtung 31 zugeführt. In der Folienführungseinrichtung 31 wird die Transferfolie 4 zuerst über die Breitstreckwalze 36 und sodann über die Presswalze 35 geführt. Es ist hierbei auch möglich, dass die Folienführungseinrichtung 31 neben der Breitstreckwalze 36 noch eine weitere Breitstreckwalze oder eine Bananenwalze aufweist, über die die Transferfolie geführt wird. Weiter ist es auch möglich, dass die Folienführungseinrichtung 31 nicht nur über eine angetriebene Presswalze, sondern über mehrere angetriebene Walzen verfügt, über die die Transferfolie 4 geführt wird.The transfer film 4 is unwound from the film unwinder 23 from the film supply roll 25 and fed via the dancer roller 29 of the film guide device 31. In the film guiding device 31, the transfer film 4 is first passed over the spreader roller 36 and then over the press roller 35. In this case, it is also possible for the film guiding device 31, in addition to the spreader roll 36, to have a further spreader roll or a banana roll over which the transfer film is guided. Furthermore, it is also possible for the film guiding device 31 to have not only a driven press roll but a plurality of driven rolls over which the transfer film 4 is guided.

Sodann durchläuft die Transferfolie 4 den von dem Transferzylinder 21 und dem Gegendruckzylinder 22 gebildeten Transferspalt und wird hierbei von dem Transferzylinder 21 und dem Gegendruckzylinder 22 mit einer vordefinierten Kraft gegen das ebenfalls durch den Transferspalt geführte Substrat 5 gepresst. In den Bereichen, in denen das Substrat mit dem Kleber beschichtet ist, haftet die Übertragungslage der Transferfolie 4 auf dem Substrat an. Beim Auslaufen aus dem Transferspalt verbleiben somit diese Bereiche der Transferlage der Transferfolie 4 auf dem Substrat 5 und werden so von der Trägerfolie der Transferfolie 4 abgelöst. In den übrigen Bereichen verbleibt die Übertragungslage der Transferfolie 4 auf der Trägerfolie der Transferfolie und wird mit dieser abtransportiert.Then, the transfer film 4 passes through the transfer nip formed by the transfer cylinder 21 and the impression cylinder 22 and is thereby pressed by the transfer cylinder 21 and the impression cylinder 22 with a predefined force against the also guided through the transfer nip substrate 5. In the regions in which the substrate is coated with the adhesive, the transfer layer of the transfer film 4 adheres to the substrate. When leaving the transfer nip, these areas of the transfer layer of the transfer film 4 thus remain on the substrate 5 and are thus removed from the carrier film of the transfer film 4. In the other areas, the transfer layer of the transfer film 4 remains on the carrier film of the transfer film and is transported away with this.

Im Weiteren durchläuft die Transferfolie 4 die Folienführungseinrichtung 32 und wird dort über die Presswalze 38 und die Breitstreckwalze 39 geführt und sodann von dem Aufwickler 24 auf die Foliensammelrolle 27 aufgespult. Hierbei ist es vorteilhaft, wenn die Transferfolie 4 nach Durchlauf der Folienführungseinrichtung 32 über eine (in Fig. 1 nicht gezeigte) Tänzerrolle geführt wird, um so eventuell auftretende Bahnzugschwankungen auszugleichen.In addition, the transfer film 4 passes through the film guiding device 32 and is guided there over the press roll 38 and the spreader roll 39 and then wound up by the rewinder 24 onto the film collecting roll 27. It is advantageous if the transfer film 4 after passing through the film guide device 32 via a (in Fig. 1 not shown) dancer roll is performed so as to compensate for any Bahnzugschwankungen.

Die Steuereinrichtung 33 umfasst ein oder mehrere Prozessoren, eine Speichereinrichtung sowie periphere Baugruppen, welche die Ansteuerung der Antriebe der Folienführungseinrichtungen 31 und 32 ermöglichen. Weiter umfasst die Steuereinrichtung 33 ein Steuerprogramm, welches in Zusammenwirken mit den oben beschriebenen Hardware-Komponenten die im Folgenden beschriebenen Funktionen der Steuereinrichtung 33 durchführt:
Die Steuereinrichtung 33 steuert die Antriebe der Presswalzen 35 und 38 an, um so die im Bereich des Übertragungsspaltes anliegende Bahnzugspannung und/oder Bahngeschwindigkeit zu regeln. Hierzu erfasst die Steuereinrichtung 33 die Bahnzugspannung der Transferfolie im Bereich des Transferspaltes und/oder die Bahngeschwindigkeit der Transferfolie im Bereich des Transferspaltes durch entsprechende Messgeber, beispielsweise Messwalzen, welche mit einem induktiven, kapazitiven oder optischen Drehwertgeber mechanisch gekoppelt sind. Weiter ist es auch möglich, dass die Steuereinrichtung 33 die Ist-Werte der Bahnzugspannung oder der Bahngeschwindigkeit basierend auf der Antriebsgeschwindigkeit oder dem Antriebsmoment der Presswalzen 35 und 38 bzw. der Antriebseinrichtungen berechnet, die diese Walzen antreiben. Die Steuereinrichtung 33 verwendet die so mittels Messwertgeber oder durch Berechnung ermittelten Ist-Werte als Eingangsparameter eines Regelalgorithmus, welche diese Ist-Werke durch Ansteuerung der Walzen 38 und 35 auf vorgegebene Soll-Werte einregelt.The control device 33 includes one or more processors, a memory device and peripheral modules, which enable the actuation of the drives of the film guiding devices 31 and 32. Furthermore, the control device 33 comprises a control program which, in cooperation with the hardware components described above, performs the functions of the control device 33 described below:
The control device 33 controls the drives of the press rolls 35 and 38 so as to control the web tension and / or web speed present in the region of the transfer nip. For this purpose, the control device 33 detects the web tension of the transfer film in the region of the transfer nip and / or the web speed of the transfer film in the region of the transfer nip by appropriate encoders, for example measuring rollers, which are mechanically coupled to an inductive, capacitive or optical rotary encoder. Furthermore, it is also possible for the control device 33 to calculate the actual values of the web tension or the web speed based on the drive speed or the drive torque of the press rollers 35 and 38 or the drive devices which drive these rollers. The control device 33 uses the actual values thus determined by means of transducers or by calculation as input parameters of a control algorithm which adjusts these actual works to predetermined desired values by controlling the rollers 38 and 35.

Zur Regelung der Bahnzugspannung der Transferfolie im Transferspalt verändert hierbei die Steuereinrichtung 33 die Antriebsgeschwindigkeit der Presswalzen 35 und 38 derart, dass sich die Bahnzuggeschwindigkeiten der Folienführungseinrichtungen 31 und 32 leicht unterscheidet und sich so die Bahnzugspannung im Bereich des Transferspaltes erhöht oder verringert. Im Weiteren ist es auch möglich, dass die Steuereinrichtung 33 nicht die Antriebsgeschwindigkeit, sondern das Antriebesmoment steuert, mittels dem die Presswalzen 35 und 38 angetrieben werden.In order to control the web tension of the transfer film in the transfer nip, the control device 33 changes the drive speed of the press rolls 35 and 38 such that the web train speeds of the film guide devices 31 and 32 are slightly different and the web tension in the area of the transfer nip increases or decreases. Furthermore, it is also possible that the control device 33 does not control the drive speed, but the drive torque, by means of which the press rollers 35 and 38 are driven.

Wie in Fig. 1 angedeutet, ist hier besonders vorteilhaft, wenn die Folienführungseinrichtungen 31 und 32 möglichst nahe zum Transferspalt angeordnet sind und so die Bahnlänge zwischen den sich am nächsten liegenden angetriebenen Walzen der Folienführungseinrichtungen 31 und 32 möglichst kleiner als 80 cm, vorzugsweise kleiner als 60 cm ist.As in Fig. 1 indicated, is particularly advantageous if the film guide means 31 and 32 as close as possible to the transfer nip are arranged and so the web length between the closest driven rollers of the film guide means 31 and 32 is as small as possible 80 cm, preferably smaller than 60 cm.

Die Breitstreckwalzen 36 und 39 sind vorzugsweise mechanisch, pneumatisch oder elektrisch verstellbare Breitstreckwalzen, wobei auf die Breitstreckwalze 39 auch verzichtet werden kann. Die Krümmung der Breitstreckwalze 36 wird von einem Bediener, vorzugsweise jedoch von der Steuereinrichtung 33 so eingestellt, dass die Transferfolie 4 mit einer über ihre Breite möglichst gleichmäßigen Bahnzugspannung in dem Pressspalt zwischen Presswalze 34 und der Gegendruckwalze 35 einläuft. Weiter sind die Lagerpunkte der Breitstreckwalze 36 horizontal verstellbar gelagert, so dass Schrägzüge der Transferfolie durch nicht gegebene Planparallelität vorgehender Umlenkwalzen korrigiert werden können. Auch diese Korrektur erfolgt vorzugsweise gesteuert durch die Steuereinrichtung 33. Hierzu wird die in den Pressspalt zwischen der Presswalze 35 und der Gegendruckwalze 34 einlaufende Transferfolie 4 durch einen optischen Sensor, beispielsweise eine Kamera, erfasst und sodann mittels eines Regelkreises die Krümmung der Breitstreckwalze 36 sowie die Position deren Lagerpunkte so eingestellt, dass die Folienspannung über die Breite der Transferfolie 4 konstant ist und die Transferfolie ohne Schrägzug in den Pressspalt einläuft.The spreader rolls 36 and 39 are preferably mechanically, pneumatically or electrically adjustable spreader rolls, wherein the spreader roll 39 can also be dispensed with. The curvature of the spreader roll 36 is adjusted by an operator, but preferably by the control device 33, so that the transfer film 4 enters the press nip between the press roll 34 and the counterpressure roll 35 with a web tension that is as uniform as possible over its width. Next, the bearing points of the spreader roller 36 are mounted horizontally adjustable, so that diagonal trains of the transfer film can be corrected by not given parallelism of front guide rollers. This correction is also preferably controlled by the control device 33. For this purpose, the incoming in the press nip between the press roller 35 and the platen 34 transfer sheet 4 by an optical sensor, such as a camera, detected and then by means of a control loop, the curvature of the spreader roller 36 and the Position whose bearing points adjusted so that the film tension over the width of the transfer film 4 is constant and the transfer film enters the press nip without diagonal pull.

Entsprechend kann die Breitstreckwalze 39 der Folienführungseinrichtung 32 ausgestaltet und gesteuert werden. Anstelle einer variabel einstellbaren Breitstreckwalze kann auch eine Bananenwalze eingesetzt werden.Accordingly, the spreader roller 39 of the film guide device 32 can be configured and controlled. Instead of a variably adjustable spreader roll and a banana roll can be used.

Claims (16)

  1. Device (1) for the cold transfer of the transmission layer of a transfer film (4) to a substrate (5) which is at least partially coated with an adhesive, wherein the device (1) has a transfer mechanism (12) comprising a film transfer cylinder (21) and a counterpressure cylinder (22), which form a transfer gap for transmitting the transmission layer of the transfer film to the regions of the substrate that are coated with the adhesive, and the device (1) has a film winder (24) for winding the transfer film (4) onto a film collecting roll (27),
    wherein the device (1) has a first and a second film guide apparatus (31, 32), which are arranged on both sides of the transfer gap in the film web of the transfer film (4), wherein the first film guide apparatus (31) is arranged in the film web between a film supply roll (25) and the transfer gap and the second film guide apparatus (32) is arranged in the film web between the transfer gap and the film winder (24), characterised in that
    the first and the second film guide apparatus (31, 32) each have at least one roller (35, 38) driven by provision of a drive torque thereof, via which roller (35, 38) the transfer film is guided.
  2. Device (1) according to claim 1,
    characterised in that
    the device (1) has a control apparatus (33) for controlling the driven rollers (35, 38) of the first film guide apparatus (31) and the second film guide apparatus (32).
  3. Device (1) according to claim 2,
    characterised in that
    the control apparatus (33) is designed in such a way that it regulates the web tension which is applied in the region of the transfer gap by controlling the driven rollers (35, 38) of the first film guide apparatus (31) and the second film guide apparatus (32).
  4. Device (1) according to claim 2 or 3,
    characterised in that
    the control apparatus (33) controls the drive speed and/or the drive torque of the driven rollers (35, 38).
  5. Device (1) according to one of claims 2 to 4,
    characterised in that
    the control apparatus (33) controls the contact pressure of the driven rollers (35, 38).
  6. Device (1) according to one of claims 2 to 5,
    characterised in that
    the control apparatus (33) is designed in such a way that it calculates the actual value of the web tension from the torques of the drive apparatus which drive the at least one driven roller (35) of the first film guide apparatus (31) and the at least one driven roller (38) of the second film guide apparatus (32).
  7. Device (1) according to one of claims 2 to 6,
    characterised in that
    the control apparatus (33) is designed in such a way that it calculates the actual value of the web tension from the drive speeds of the drive apparatus which drive the at least one driven roller (35) of the first film guide apparatus (31) and the at least one driven roller (38) of the second film guide apparatus (32).
  8. Device (1) according to one of claims 2 to 7,
    characterised in that
    the device (1) has one or more measuring transmitters which detect the web tension or the web speed as a measured variable, the one or more measuring transmitters are connected to the control apparatus (33) and the control apparatus (33) is designed in such a way that it regulates the web tension in the region of the transmission gap by means of the measurements detected by the one or more measuring transmitters.
  9. Device (1) according to one of the preceding claims,
    characterised in that
    the web length of the transfer film (4) between the transfer gap and the nearest driven roller (35, 38) of the first and/or second guide apparatus (31, 32) is less than 50 cm.
  10. Device (1) according to one of the preceding claims,
    characterised in that
    the web length of the transfer film (4) between the nearest driven roller (35, 38) of the first guide apparatus (31) and the second guide apparatus (32) is less than 80 cm.
  11. Device (1) according to one of the preceding claims,
    characterised in that
    the first film guide apparatus (31) and/or the second film guide apparatus (32) has a variably adjustable spreader roller (36, 39) via which the transfer film (4) is guided.
  12. Device (1) according to claim 11,
    characterised in that
    the variably adjustable spreader roller (36, 39) is arranged in the film web of the transfer film (4) between the film supply roll (25) and the at least one driven roller (35) of the first film guide apparatus (31) or between the at least one driven roller (38) of the second film guide apparatus (32) and the film winder (24).
  13. Device (1) according to one of the preceding claims,
    characterised in that
    the first and/or the second film guide apparatus (31, 32) have a banana roller via which the transfer film (4) is guided.
  14. Device (1) according to claim 13,
    characterised in that
    the banana roller is arranged in the film web of the transfer film (4) between the film supply roll (25) and the at least one driven roller (34) of the first film guide apparatus (31) or between the at least one driven roller (38) of the second film guide apparatus (32) and the film winder (24).
  15. Device (1) according to one of claims 11 to 14,
    characterised in that
    the spreader roller and/or the banana roller is horizontally displaceably mounted.
  16. Device (1) according to one of the preceding claims,
    characterised in that
    the first and/or second film guide apparatus (31, 32) are fastened on the outer side of the housing of the transfer mechanism (12).
EP09010151.0A 2008-09-04 2009-08-06 Transfer device Active EP2161130B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09010151T PL2161130T3 (en) 2008-09-04 2009-08-06 Transfer device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008045682A DE102008045682A1 (en) 2008-09-04 2008-09-04 transfer device

Publications (3)

Publication Number Publication Date
EP2161130A2 EP2161130A2 (en) 2010-03-10
EP2161130A3 EP2161130A3 (en) 2011-04-13
EP2161130B1 true EP2161130B1 (en) 2018-09-19

Family

ID=41402213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09010151.0A Active EP2161130B1 (en) 2008-09-04 2009-08-06 Transfer device

Country Status (3)

Country Link
EP (1) EP2161130B1 (en)
DE (1) DE102008045682A1 (en)
PL (1) PL2161130T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103029425B (en) 2011-10-07 2015-07-29 小森公司 Film transfer equipment
EP3251846B1 (en) * 2016-05-30 2019-08-07 Vinnovation Holding B.V. Device for handling foil for use in a printing process
CN112223900A (en) * 2020-10-16 2021-01-15 开平市祥艺彩印有限公司 Multifunctional printing device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2430298A1 (en) * 1974-06-24 1976-08-05 Wittler & Co H Transverse stretching roll - with curved rigid shaft and arrangement for increasing the load bearing capacity thereof
DE202004003746U1 (en) * 2004-03-10 2004-05-19 m-tech AG Device for transferring regions of material of hot stamping foil onto printing material has cylinders and support guides for foil formed as separate active dancers movable in different directions to compensate for different properties
DE102005056802A1 (en) * 2005-11-29 2007-05-31 Bosch Rexroth Ag Regulation of the web tension of a web
DE102006056896A1 (en) 2005-12-27 2007-06-28 Man Roland Druckmaschinen Ag Transfer of images/text from a carrier film to printed sheets, in a sheet-fed rotary printing press, varies the film draw tension at the transfer gap in the coating cycle according to film quality

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102008045682A1 (en) 2010-03-11
EP2161130A2 (en) 2010-03-10
EP2161130A3 (en) 2011-04-13
PL2161130T3 (en) 2019-02-28

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