EP3455073B1 - Procédé et dispositif pour imprimer une bande de matière à imprimer à l'intérieur d'une presse rotative - Google Patents

Procédé et dispositif pour imprimer une bande de matière à imprimer à l'intérieur d'une presse rotative Download PDF

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Publication number
EP3455073B1
EP3455073B1 EP17719569.0A EP17719569A EP3455073B1 EP 3455073 B1 EP3455073 B1 EP 3455073B1 EP 17719569 A EP17719569 A EP 17719569A EP 3455073 B1 EP3455073 B1 EP 3455073B1
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EP
European Patent Office
Prior art keywords
printing
web
length
roller
print
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
EP17719569.0A
Other languages
German (de)
English (en)
Other versions
EP3455073A1 (fr
Inventor
Mario FRANKENBERG
Rainer Ehrenberg
Frank Westhof
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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Publication of EP3455073A1 publication Critical patent/EP3455073A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders

Definitions

  • the invention relates to a method and a device for printing a web of printing material within a rotary printing press.
  • Rotary printing machines in which a print motif is repeatedly applied to a substrate web, print motifs are applied by a printing roller.
  • the web of printing material runs on an impression cylinder.
  • the peripheral speeds of the printing roller and the impression cylinder are the same.
  • Print length is the distance between two identical points within two consecutive print motifs. These can be the register points, for example.
  • the position of the print on the unwound material web is corrected by correcting the web tension by means of a web tension-controlled feeder in front of the printing roller in such a way that the print material web is stretched to a constant print length by, depending on the measured print length, the material with a higher or lower web tension is influenced in its elongation in order to be able to feed a printing material web to the printing roller, which has both a constant repeat length that corresponds to the print length of the new print and the position of the new print.
  • the U.S. 3,559,568 describes a method for adapting the print length to a target print length, the printed print length being measured and, in the event of a deviation, the printed print length being adapted in order to reduce the deviation.
  • the measurement therefore takes place behind the printing unit and is not compared with a motif that has already been printed on the back.
  • the US 2006/0016359 A1 deals with the problem that a printed roll changes an actual length during storage. These changes are modeled and the print length is varied according to this model. The print lengths are also measured and compared to the target print length. The print length is therefore adjusted based on the predictive model.
  • the DE 195 47 074 A1 deals with the printing of a tubular packaging material. In order to achieve register accuracy when printing the back, markings are printed with a non-visible UV ink, which are used to adjust the register. Register marks are therefore necessary. Thus, the DE 195 47 074 A1 a method according to the preamble of claim 1 and a corresponding printing machine for performing the same.
  • the disadvantages of this method are that the influence on the correction of the repeat length is limited by changing the web tension.
  • the web tension must not be arbitrarily low in order to shorten the repeat length, as a minimum web tension is always required. to drive the material web safely through the machine.
  • the web tension must not be arbitrarily high in order to achieve an extension of the repeat catch, since web tension that is too high can permanently change the printing material by causing permanent plastic deformation if the material-typical yield point is exceeded.
  • the object of the present invention is therefore to propose a method and a device for printing a printing material web within a rotary printing press, with which the disadvantages described above can be avoided.
  • a print motif is applied to the printing material with at least one printing roller, the printing roller rotating at a peripheral speed, a printing length being measured by means of at least one measuring device arranged within the rotary printing machine and the peripheral speed of the at least one printing roller being changed if the measured print length deviates from a target print length.
  • the core idea of the invention is therefore to measure the printing length on the printing material and to change the circumferential speed of the printing roller to match if this measured printing length deviates from a target printing length.
  • the printing length can now be changed, in which case the circumferential speed of the impression cylinder is not changed or at least not changed to the same extent. So it can come to different circumferential speeds of the printing roller and the impression cylinder.
  • the relationship here is that if the speed of the format cylinder drives is lower than the web speed, longer formats are printed and if the speed of the format cylinder drives is higher than the web speed, shorter formats are printed.
  • Part of the invention is that the printing substrate web is no longer impressed with any changed web tensions, as was the case in the prior art. This is achieved, for example, in that the printing substrate web is now moved with a constant tensile force. In other words, the web tensions of the substrate web remain unaffected.
  • the method according to the invention makes it possible for the first time to comprehensively adjust the printing length in the case of rigid materials such as paper or metal films.
  • the measurement of the printing length is carried out before the printing substrate web reaches the printing roller.
  • the circumferential speed of the printing roller can even be set individually for each of these printing motifs in the case of existing print motifs on the back.
  • the appropriate point in time at which the peripheral speed of the printing roller is to be changed in order to change the printing lengths appropriately can be used.
  • a measured print length and the consequently changed print length of the print roller form a new target print length with which the print lengths of the subsequent print motifs are compared.
  • the printing of a web of printing material is provided within a multicolor rotary printing machine.
  • the problem arises that the circumferential speeds of the individual printing rollers are changed in such a way that the individual, multicolored print motifs are printed in correct register in order to avoid waste.
  • a preferred solution to this problem is in WO 2014/020083 A2 disclosed.
  • the single figure shows a side view of a printing press according to the invention.
  • This printing press 1 includes a printing unit 2 which has a central impression cylinder 3.
  • the impression cylinder 3 is rotatably mounted in a machine frame, not shown.
  • Consoles which represent the supports for the inking units 4 are also not shown.
  • the inking units 4 only the printing rollers 5 and the inking rollers, for example anilox rollers 6, are shown.
  • the printing substrate web 7 is made available in the printing machine on a reel 8 which is rotatably clamped in an unwinding station 9.
  • the unwound printing material web 7 is guided over several guide rollers 10 from the unwinding station 9 to the pressure roller 11, with which the printing material web 7 can be applied to the impression cylinder.
  • the web path between the unwinding station 9 and the pressure roller is viewed as the feed path 12 of the printing substrate web 7.
  • the web of printing material 7 After the web of printing material 7 has passed through the printing unit 2, it is fed to the drying box 15. There it is guided past dryers (not shown) and / or other devices which serve to harden the printing ink via numerous guide rollers 18. After leaving the drying box, the web 7 is fed to the winding station 16, where it is further processed into a roll 17. The web 7 is always guided between the printing unit 2 and the winding station 16 in such a way that its unprinted side rests on the guide rollers 18.
  • measurements are now made with a sensor, for example a register sensor.
  • the print length is determined - preferably for each print motif.
  • This measured value is transmitted to the computing and control unit 22 via the data line 21.
  • the computing and control unit 22 now compares the measured print length with a target print length, which preferably corresponds to the previously measured print length. If the measured print length deviates from the target print length, the computing and control unit sends control commands via the control line 23 to the drive M of the printing roller 5 The control command or commands lead to a change in the peripheral speed of the printing roller 5, which depends on the size of the deviation described above.
  • the print length resulting from the newly set circumferential speed is now stored as the new set print length in the computing and control unit 22.
  • a further change in the circumferential speed of the printing roller 5 can now be omitted if the measured printing length corresponds to this target value.
  • the Adjustment of the further printing rollers 5, which follow the printing material web 7 in the transport direction T of the first printing roller, is preferably carried out according to the WO 2014/020083 A2 disclosed method.
  • the Figure 2 shows a further embodiment of the invention which is no longer covered by the claims.
  • the sensor 20 is now arranged behind the inking units 4 in the transport direction of the printing substrate web 7. This means that the printing substrate web 7 has already been printed. However, it is not necessary that the sensor is also arranged behind the drying box 15. Rather, it can also be provided in front of the drying box 15.
  • the sensor 20 now monitors the printing length of the printing substrate web 7 printed in the printing press 1 and compares this with a value for the target printing length, which can be specified for the computing and control unit. This target printing length can be the circumference of the printing rollers 5 directly.
  • the computing and control device sends a control command to the motor M of the print roller 5 in order to change the peripheral speed.
  • the target print length is preferably not changed. In this way it is possible to always obtain the same printing length even in the case of web tension variations within the printing substrate web 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (5)

  1. Procédé d'impression d'une bande de substrat (7) à l'intérieur d'une machine d'impression rotative (1),
    dans lequel
    • avec au moins un rouleau d'impression (5), un motif d'impression est appliqué sur la bande de substrat (7), dans lequel le rouleau d'impression (5) tourne avec une vitesse périphérique,
    • au moyen d'au moins un dispositif de mesure (20), disposé à l'intérieur de la machine d'impression rotative (1), une longueur d'impression est mesurée et dans lequel la mesure de la longueur d'impression est effectuée avant que la bande de substrat (7) n'atteigne le rouleau d'impression (5), dans lequel, avec le dispositif de mesure (20), la longueur d'impression d'un motif d'impression se trouvant déjà à l'arrière de la bande de substrat (7) est mesurée, caractérisé en ce que la vitesse périphérique de l'au moins un rouleau d'impression (5) est modifiée lorsque la longueur d'impression mesurée s'écarte d'une longueur d'impression de consigne, dans lequel les contraintes de la bande de substrat (7) restent inchangées.
  2. Procédé selon la revendication précédente,
    caractérisé en ce que
    la vitesse périphérique du rouleau d'impression (5) est réglée de façon à ce que l'impression ait lieu avec la longueur d'impression mesurée.
  3. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    la longueur d'impression mesurée selon laquelle la vitesse d'impression du rouleau d'impression (5) est réglée est enregistrée en tant que longueur d'impression de consigne.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    en fonction de la distance entre le dispositif de mesure (20) et le rouleau d'impression (5) le long de la trajectoire de la bande de substrat (7), le moment adapté auquel la vitesse périphérique du rouleau d'impression (5) est modifiée, est déterminé.
  5. Machine d'impression (1) pour l'impression d'une bande de substrat (7), dans laquelle la machine d'impression (1) est prévue et conçue pour exécuter le procédé selon l'une des revendications 1 à 4.
EP17719569.0A 2016-05-11 2017-04-25 Procédé et dispositif pour imprimer une bande de matière à imprimer à l'intérieur d'une presse rotative Active EP3455073B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016208132 2016-05-11
PCT/EP2017/059717 WO2017194299A1 (fr) 2016-05-11 2017-04-25 Procédé et dispositif pour imprimer une bande de matière à imprimer à l'intérieur d'une presse rotative

Publications (2)

Publication Number Publication Date
EP3455073A1 EP3455073A1 (fr) 2019-03-20
EP3455073B1 true EP3455073B1 (fr) 2021-02-24

Family

ID=58632982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17719569.0A Active EP3455073B1 (fr) 2016-05-11 2017-04-25 Procédé et dispositif pour imprimer une bande de matière à imprimer à l'intérieur d'une presse rotative

Country Status (3)

Country Link
EP (1) EP3455073B1 (fr)
ES (1) ES2864766T3 (fr)
WO (1) WO2017194299A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021118031A1 (de) * 2021-07-13 2023-01-19 Koenig & Bauer Ag Bearbeitungsmaschine sowie Verfahren zur Einstellung einer Bearbeitungslänge eines Formgebungsaggregats einer Bearbeitungsmaschine
CN114523756A (zh) * 2022-02-09 2022-05-24 福建琦峰科技有限公司 一种满足套色稳定的印刷图案长度控制方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3559568A (en) * 1969-01-14 1971-02-02 Armstrong Cork Co Method of controlling pattern repeat length
CN101415555B (zh) * 2004-07-10 2011-07-13 克劳佩塑料制品有限公司 印刷的可伸展材料中印刷重复长度变化的校正方法

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP3455073A1 (fr) 2019-03-20
ES2864766T3 (es) 2021-10-14
WO2017194299A1 (fr) 2017-11-16

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