EP1700694A2 - Method of embossing for corrugated cardboard in a sheet-fed printing press and associated device - Google Patents

Abstract

The method involves transferring UV color coated image producing layers from a back-up film of a transfer foil (5) onto a printing sheet. The transfer foil is passed via a common gap along with the sheet under the pressure of a counter-pressure cylinder. The image producing layers are adhered to the sheet in a section provided with an adhesive, where the section is lifted by the back-up film after the exit of the sheet from the gap. An independent claim is also included for a device for implementing a method for coating a corrugated board.

Description

The invention relates to a method for carrying out in a device for transfer of imaging layers from a carrier film to printed sheet according to the preamble of patent claim 1.

It is known to produce metallic layers on printed sheets by means of a film transfer process. So is in the EP 0 569 520 B1 a printing material and a printing apparatus using this material are described. In this case, a sheet-processing machine is shown, which has a feeder and a boom, wherein printing units and a coating module are arranged between the two units. In at least one of the printing units, an adhesive pattern is applied by means of the planographic printing process. This adhesive pattern is applied in a cold printing process and has a specific imaging subject. In the printing unit following the coating module with a counter-pressure cylinder and a press roller, a film guide is provided. This is designed in such a way that a film strip or a transfer film is guided through the transfer nip of the coating module between the impression cylinder and the press roll from a film supply roll. The film strip is rewound on the outlet side after leaving the coating module. The transfer film has a carrier layer on which imaging layers such as metallic layers, for example of aluminum, can be applied. Between the metallic layer and the carrier film, a separating layer is provided, which ensures that the metallic layer can be removed from the carrier layer.

When printing sheets are transported through the printing unit, each sheet is given an adhesive pattern. Thereafter, the sheet is passed through the coating module, being brought by means of the press roller on the impression cylinder resting sheet with the film material in combination. At the same time, the metal layer lying down is narrow Connect to the adhesive areas on the sheet. After further transporting the printing sheet, the metallic layer adheres only in the area provided with the adhesive pattern. The carrier film is thus removed from the metallic layer in the region of the adhesive pattern. The used in this way transfer film is wound up again. The print sheet is laid out in the coated state.
The method according to the known prior art is not applicable to sensitive substrates, such as corrugated board, since it requires a so-called calendering, which takes place in a workstation after the film application.

The object of the invention is therefore to provide a method and an associated device, by means of which the transfer of an imaging layer, e.g. a metallization, even on sensitive sheets safely, economically and accurately can be done.

The solution to this problem results in a method according to the features of claim 1 and in a device according to the features of claim 3.

Advantageously, a printed sheet of corrugated board is coated after a pre-coating by means of a cold foil stamping process.

An associated apparatus for coating corrugated cardboard has a flexible reference to the press roll. This can be designed in such a way that a specific compressibility with regard to the uneven or inconsistent surface structure of the corrugated cardboard is given. The device can also be used to coat different types of substrates with uneven surface textures.

The device can also be advantageously used in order to improve the use of the film by dividing the transfer film into one or more partial film webs of lesser width. In combination with the above-mentioned method, it is thus also possible to use different types of film side by side.

To ensure the efficiency of the coating process can be provided to control the film feed such that the transfer film is then stopped when no transmission of the imaging or metallization takes place.
Advantageously, a control of the transfer film can be carried out such that, when passing through a cylinder channel receiving the grippers of the sheet-guiding impression cylinder, the film feed is stopped, wherein the press roll then passes in a sliding manner under the transfer film.

To improve the gloss effect, the image-forming layer can be applied by means of so-called UV negative-pressure ink. The UV negative pressure ink is applied by means of the printing unit for the adhesive in a corresponding manner via an offset printing plate.

Advantageously, it is also possible to provide a plurality of coating modules behind one another within a sheet-processing machine. Thus, the application of different imaging coatings or metallization layers within a subject can take place one after the other. In this case, it is possible to transmit the imaging layers next to one another using a single adhesive pattern with all image-pattern elements. It is also possible to provide a first adhesive pattern in a first coating module with a first image-forming coating or metallization layer and, in the following, to apply another, the first enclosing adhesive pattern and to provide it with another image-forming coating or metallization layer.

In the following the invention is illustrated in more detail with reference to figures.

Figur 1

eine grundsätzliche Darstellung einer Druckmaschine mit einem Auftragwerk und einem Beschichtungsmodul,

Figur 2

den Aufbau eines Beschichtungsmodules mit einer Folientransfereinrichtung,

Figur 3

eine Presswalze in detaillierter Darstellung, und

Figur 4

eine Auftrageinrichtung für Kleber oder eine Vorbeschichtung.

Showing:

FIG. 1

a basic representation of a printing press with an applicator and a coating module,

FIG. 2

the construction of a coating module with a film transfer device,

FIG. 3

a press roll in more detail, and

FIG. 4

an applicator for adhesive or a pre-coating.

• Ein zu beschichtender Druckbogen wird in einem ersten Arbeitschritt mit einem bildgebenden Klebstoffmuster versehen. Der Auftrag des Klebers erfolgt im einer als Auftragwerk 1 konfigurierten Vorrichtung, z.B. einem konventionellen Druckwerk einer Offsetdruckmaschine über dort vorhandene Farb- und Feuchtwerke 11, eine Druckplatte auf einem Plattenzylinder 12, einen Drucktuch- oder Gummizylinder 13 und einen Gegendruckzylinder 4.
• Danach wird in einem zweiten Schritt gemeinsam mit einem Druckbogen eine Transferfolie 5 durch einen Transferspalt 6 geführt, wobei die Transferfolie 5 im Transferspalt 6 gegen den Druckbogen gepresst wird. Hierzu wird ein Beschichtungsmodul 2 verwendet, das einem Druckwerk oder einem Lackmodul oder einer Basiseinheit oder einer andersartigen Verarbeitungsstation einer Bogenoffsetdruckmaschine entsprechen kann.
• Der Transferspalt 6 im Beschichtungsmodul 2 wird durch eine Presswalze 3 und einen Gegendruckzylinder 4 gebildet.
  Hierbei kann die Presswalze 3 einem Drucktuchzylinder und der Gegendruckzylinder 4 einem Gegendruckzylinder eines an sich bekannten Offsetdruckwerkes entsprechen.
  Weiterhin kann die Presswalze 3 einem Formzylinder und der Gegendruckzylinder 4 einem Gegendruckzylinder eines Lackmodules einer Bogendruckmaschine entsprechen.
• Weiterhin kann dem Beschichtungsmodul 2 nachgeschaltet ein so genanntes Kalandrierwerk vorgesehen werden, wenn der beschichtete Druckbogen zur Steigerung der Haftung der Beschichtung bzw. zur Steigerung von Glätte und Glanz des Druckbogen unter erhöhtem Druck überwalzt werden soll.

FIG. 1 shows a sheet-processing machine, here a printing press, which consists of at least two printing units. The two printing units are used for the following purposes:

• A sheet to be coated is provided in a first step with an adhesive imaging pattern. The application of the adhesive takes place in a device configured as an applicator 1, for example, a conventional printing unit of an offset printing press on there existing inking and dampening 11, a printing plate on a plate cylinder 12, a blanket or blanket cylinder 13 and a counter-pressure cylinder. 4
• Thereafter, in a second step, together with a printing sheet, a transfer film 5 is guided through a transfer nip 6, wherein the transfer film 5 is pressed in the transfer nip 6 against the printing sheet. For this purpose, a coating module 2 is used which can correspond to a printing unit or a lacquer module or a base unit or another type of processing station of a sheet-fed offset printing press.
• The transfer nip 6 in the coating module 2 is formed by a press roll 3 and an impression cylinder 4.
  Here, the press roller 3 a blanket cylinder and the impression cylinder 4 correspond to a counter-pressure cylinder of a known offset printing unit.
  Furthermore, the press roller 3 a forme cylinder and the impression cylinder 4 a counter-pressure cylinder of a paint module of a sheet-fed press correspond.
• Furthermore, the coating module 2 downstream of a so-called calendering be provided when the coated sheet to increase the adhesion of the coating or to increase the smoothness and gloss of the sheet is to be rolled under increased pressure.

Within the coating module 2 used for the film transfer, a web guide for transfer films 5 is shown.
For processing in question transfer sheets 5 are constructed in multiple layers. They have a carrier layer on which an imaging layer is applied by means of a release layer. The separating layer serves to facilitate lifting of the imaging layer from the carrier layer. The image-forming layer may be, for example, a metallized layer or a glossy layer or a texture layer or a colored layer or a layer containing one or more image patterns.

The film supply roll 8 is assigned to the coating module 2 on the sheet feed side. The film supply roll 8 has a rotary drive 7. The rotary drive 7 is required for the continuous controlled feeding of the transfer film 5 to the coating module 2 and is therefore controllable.
Furthermore, in the field of film feed and removal guide devices 14, such as deflection or tensioning rollers, pneumatically actuated conducting means, baffles o. Ä. Provided. Thus, the film web of the transfer film 5 can always be performed flat without distortion and held in the same voltage against the press roller 3. The guide devices 14 may also contain aids for introducing the transfer film 5. In this case, automatic retraction aids for the film web of the transfer film 5 can be used.
In this way, the film feed in the area of the coating unit 2 surrounding Verschutzungen 15 is simplified. The protective function of the Verschutzungen 15 is maintained at the same time completely.

In this case, the transfer film 5 can be guided around the press roll 3, wherein the transfer film 5 can be fed and discharged in an advantageous manner from one side of the coating module 2 to the press nip 6.
In a further embodiment, the transfer film 5 can also be fed in and out substantially tangentially on the press roll 3 or wrap it around the press nip 6 only in a small circumferential angle. For this purpose, the transfer film 5 is supplied from one side of the coating module 2 and discharged to the opposite side of the coating module 2.

On the outlet side of the printing unit, a film collection roller 9 is shown. On the film collecting roll 9, the used film material is wound up again. Again, a rotary drive 7 is provided for the optimized production, which is controllable. In essence, the transfer film 5 could also be moved by the rotary drive 7 on the outlet side and kept taut on the inlet side by means of a brake.

For the transfer process of the imaging eg wear layer of the transfer sheet 5 on the sheet in the transfer nip 6 between the press roll 3 and the impression cylinder 4 is essential that the surface of the press roll 3 so the blanket cylinder or forme cylinder is equipped by means of a compressible, damping element.
The press roll 3 is therefore provided with a press fabric 10 or as a roll with a corresponding coating. The press fabric 10 or press coating can be performed, for example, as a plastic coating, comparable to a blanket or blanket. The surface of the press fabric 10 or press coating is preferably very smooth. It can also be formed from antiadhesive substances or structures. Here, for example, a relatively hard structure in the form of very fine spherical caps comes into question. A press fabric 10 is held on the press roll 3 in a cylinder channel on jigs.
The press fabric 10 may be equipped to improve the transmission properties in the transfer nip 6 with a targeted elasticity. This may optionally act in a compressible intermediate layer. This compressibility is preferably similar to or less than in conventional blankets or printing cloths that can be used at this point also.
The mentioned compressibility can be produced by means of a conventional compressible printing blanket. Furthermore, combined fabrics made of a hard blanket and a soft pad can be used.
Furthermore, a limited pressing surface can be provided directly on the press roll 3 or on the press fabric 10. This can be worked out of the surface of the press fabric 10 or it can be additionally attached as a partial surface of the material of the press fabric 10 on the press roller 3.

To ensure the cost-effectiveness of the coating process, it is provided that the film advance of the transfer film 5 from the film supply roll 8 to the transfer nip 6 and the film collection roll 9 is controllable so that as far as possible the transfer film 5 is stopped when no transfer of the imaging layer should take place :
For this purpose, a control of the transfer film 5 can be made such that the film feed is stopped when passing through a gripper of the sheet-guiding counter-pressure cylinder 4 receiving cylinder channel. The grippers hold the printed sheet on the impression cylinder 4. The press roll 3 has a corresponding cylinder channel, in which the fabric is held. In the region of the corresponding cylinder channels no pressing of the transfer film 5 takes place between the press roll 3 (blanket cylinder) and the impression cylinder 4. The press roll 3 then slidably passes under the transfer film 5, while the transfer film 5 is tensioned freely between the press roll 3 and impression cylinder 4. This state continues until at the so-called pressure beginning of the cylinder channel ends and the transfer film 5 is again clamped between the press roller 3 and the impression cylinder 4, including a sheet. Then, the transfer sheet 5 is further transported. The timing of the film feed can begin or suspend slightly earlier than pretend the channel edges of the cylinder channel according to a necessary acceleration or braking of the film supply roll 8 or film collecting 9. In reaction-fast timing systems via so-called dancer rollers 18, as they are shown by way of example in FIG. 1, the control of the rotary drives 7 of the film supply rolls is 8 or film collecting roll 9 may not be necessary. By means of the dancer rollers 18, the necessary film tension is also maintained.

A further improvement of the film utilization of the type described results from the fact that the transfer film 5 is divided into one or more Teilfolienbahnen lesser width. Thus, with appropriate control by means of the device or devices for timing the film feed each of the sub-film webs, the utilization of the transfer film 5 can be improved even in zonally different lengths coating areas within a sheet. For this purpose, each partial film web is conveyed only exactly in the area where the imaging surface layer is to be applied. In the areas not to be coated, each partial film web can be stopped independently of the other partial film webs, whereby no unnecessary film consumption arises.

Furthermore, to improve the coating process provided in the area of the adhesive application and in the area of the film order dryer 16 provided. Thus, in particular by means of UV drying, the imagewise applied adhesive layer can be predried by means of a first dryer 16 (intermediate dryer I) so that the wear layer of the transfer film 5 adheres better. Furthermore, the adhesive effect of the applied wear layer on the printed sheet can be improved by the action of a second dryer 16 (intermediate dryer II) by additionally accelerating the drying of the adhesive.

Finally, the quality of the coating can be controlled by means of an inspection or monitoring device 17 after the foil application. For this purpose, the inspection device 17 is directed to a sheet-guiding surface of the coating module 2 after the transfer nip 6 and optionally sealed off from the dryer 16 or on a sheet-guiding surface of the coating module 2 downstream further sheet leading module. The coated sheet passing there can thus be checked for completeness and quality of the coating. As poorly recognized printed sheets can be marked or rejected in a sorter as waste.

The subject matter of the invention is a process for coating a transfer film 5 in a transfer nip 6 of a sheet-processing offset printing machine or flexographic printing machine or varnishing machine in conjunction with the processing of corrugated cardboard.

• erstes Druckwerk - wird als Auftragwerk 1 für den Kleberauftrag geschaltet,
• zweites Druckwerk - wird als Beschichtungsmodul 2 zur Applikation von Beschichtungen von einer Transferfolie geschaltet

The use of the printing press is as follows:

• first printing unit - is switched as application unit 1 for the adhesive application,
• second printing unit - is switched as a coating module 2 for applying coatings of a transfer film

Other printing and coating plants can be used for printing and finishing the corrugated board. In this case lacquer modules, e.g. by means of painting in the printing unit, or printing units the coating module 2 and the applicator 1 for the adhesive be preceded.

Such a module is shown in FIG. In this case, no application or coating device is shown on the press roller 3, which corresponds to the forme cylinder of a paint module. For this purpose, a device according to Figure 4 come into question.

After the coating module 2, it is also possible to arrange sheet inspection systems and devices for discharging defective printed sheets (sheet diverter, double delivery).

• Vorbeschichtung der Wellpappe z.B. mit Deckweiß, Iriodinlacke o.ä. in partiellen Bereichen oder aber vollflächig. Dies dient als Grundlage für nachfolgende Druck- und Beschichtungsvorgänge und die relativ minderwertige Außenseite der Wellpappe kann so verbessert werden
• Drucken mit einer oder mehreren Farben (z.B. auch Rückseitendruck und Wendung (oder Lackieren im Druckwerk)
• Inkjet-Einrichtung zur Kennzeichnung von Druckbogen bereits vor dem Druck-oder Beschichtungsvorgang im Anlagebereich; hierzu kann eine Trocknereinrichtung mit IR- oder UV-Strahler vorgesehen sein, um die aufgetragenen Kennzeichnungen vor der Zufuhr zur Druckmaschine zu härten
• Inkjet-Einrichtung zur Kennzeichnung der Transferfolie 5 bereits vor dem Einlauf in den Druck- oder Beschichtungsvorgang; auch hierzu kann eine Trocknereinrichtung zur Härtung der Kennzeichnung auf der Transferfolie vor der Applikation der bildgebenden Schichten zu ermöglichen
• Bildmäßiger Kleberauftrag über Offsetdruckwerk, Lackmodul oder Inline-Beschichtungseinrichtungen an Druckwerken
• Applikation einer Folienbeschichtung im Transferverfahren von einer Transferfolie 5 im Transferspalt 6 zwischen Gegendruckzylinder 4 und Presswalze 3 z.B. Gummi-/Drucktuchzylinder oder Formzylinder
• Drucken eines Sujets mit einer oder mehreren Farben über die zuvor aufgebrachte bildmässige Folienbeschichtung
• Zusätzlicher Informationseintrag bzw. Oberflächenveredelung mittels Inkjet-Systemen nach dem Druck- oder Beschichtungsvorgang innerhalb eines Druckwerkes, z.B. direkt nach dem Druckspalt, oder auch auf Bogen führenden Elementen im Auslagebereich
• Zusätzlicher Informationseintrag oder Kennzeichnung bzw. Oberflächenveredelung mittels Nummerier-Einrichtungen nach dem Druck- oder Beschichtungsvorgang innerhalb eines Druckwerkes, oder auch auf Bogen führenden Elementen im Auslagebereich
• Anwendung von Trocknersystemen für
  • → Zwischentrocknung der Vorbeschichtung,
  • → und/oder Vortrocknung des Klebers,
  • → und/oder Nachtrocknung der Folienbeschichtung,
  • → und/oder Nach-/Zwischentrocknung der Drucke,
  • → und/oder Nach-/Zwischentrocknung der kombinierten Beschichtung,
  • → und/oder Nach-/Zwischentrocknung der zusätzlichen Veredelungen.
• Auslage der Bogen mit ggf. verlängerter Trockenstrecke und spezieller Bogenführung in Bezug auf die beschädigungsfreie Auslage sowie Möglichkeiten zum automatischen Stäpelwechsel, da bei dem relativ dicken Bedruckstoff Wellpappe stets ein schnelles Stapelwachstum vorliegt.
• Vorteilhaft ist eine integrierte Anwendung einer Bogeninspektion im Druckwerk oder Lackmodul; damit kombiniert kann eine sogenannte Bogenweiche oder ein Doppelbogenausleger für Makulaturbogen eingesetzt werden. Ebenso kann eine Markierung der Makulaturbogen über ein Streifeneinschussgerät erfolgen.

A method for inline processing of corrugated cardboard which can be carried out with the devices described can include the following steps:

• Pre-coating the corrugated board eg with opaque white, iriodin varnish or similar in partial areas or over the entire surface. This serves as the basis for subsequent printing and coating operations, and the relatively inferior outer surface of the corrugated board can thus be improved
• Printing with one or more colors (eg also backside printing and turning (or varnishing in the printing unit)
• Inkjet device for marking printed sheets before the printing or coating process in the investment area; For this purpose, a drying device with IR or UV lamps can be provided in order to harden the applied markings before feeding them to the printing press
• Inkjet device for marking the transfer film 5 before entering the printing or coating process; For this purpose, a drying device for curing the marking on the transfer film before the application of the imaging layers to allow
• Imagewise adhesive application via offset printing unit, coating module or inline coating equipment on printing units
• Application of a film coating in the transfer process of a transfer film 5 in the transfer nip 6 between impression cylinder 4 and press roller 3, for example, rubber / blanket cylinder or forme cylinder
• Printing a subject with one or more colors over the previously applied imagewise film coating
• Additional information entry or surface refinement by means of inkjet systems after the printing or coating process within a printing unit, for example, directly after the printing nip, or on sheet leading elements in the display area
• Additional information entry or marking or surface refinement by means of numbering devices after the printing or coating process within a printing unit, or even on sheet leading elements in the display area
• Application of drying systems for
  • → intermediate drying of the pre-coating,
  • → and / or predrying the adhesive,
  • → and / or after-drying of the film coating,
  • → and / or post / intermediate drying of the prints,
  • → and / or post / intermediate drying of the combined coating,
  • → and / or post / intermediate drying of the additional finishing.
• Delivery of the sheets with possibly extended drying section and special bowing in relation to the damage-free delivery and possibilities for the automatic change of stacks, since the relatively thick substrate corrugated board always has a fast stack growth.
• Advantageous is an integrated application of a sheet inspection in the printing unit or paint module; combined with this, a so-called curved switch or a double-sheet delivery for waste paper can be used. Likewise, a marking of the spoiling sheet can be made via a strip injection device.

In the sheet-processing printing machine for printing and coating corrugated cardboard, a paint module or an in-line coating device according to FIG. 4 can be used for the precoating.

It may be advantageous that such an in-line coating device can be combined with a chambered doctor blade 20, an anilox roller 21 and possibly an intermediate roller 22 (rubber roller) with a plate cylinder or a blanket cylinder or a forme cylinder at different points of a printing press. FIG. 4 shows a version in which the coating takes place via a forme cylinder 13 in a paint module.
In this case, by means of such a device both adhesive and a pre-coating (primer) and a final coating (gloss, protective, drying coating) can be applied in a very flexible embodiment.

• Auftragwerk 1
• Beschichtungsmodul 2
• Druckwerk
• Lackmodul
• Beschichtungseinrichtung
• Trockner
• Inkjet-Druckeinrichtung
• ggf. weiterer Inline-Bearbeitungsstationen

sind je nach Bearbeitungsprozeß beliebig innerhalb einer Bogen verarbeitenden Maschine kombinierbar.The combination of the aforementioned elements

• Contractor 1
• Coating module 2
• printing unit
• coating module
• coater
• dryer
• Inkjet printing device
• possibly further inline processing stations

Depending on the machining process can be combined as desired within a sheet-processing machine.

Here are some examples of possible combinations of elements in different configurations:

Configuration A:

• I. Contractor 1
• II. Coating module 2
• III. Printing / -e
• IV. Paint module / -e
• V. Boom with dryer / drying section

Configuration B:

• I. Contractor 1
• II. Intermediate dryer
• III. Coating module 2
• IV. Intermediate dryer
• V. Printing unit / -e
• VI. Coating module / -e
• VII. Boom with dryer / drying line

Configuration C:

• I. Coating unit / paint module
• II. Intermediate dryer
• III. Contractor 1
• IV. Coating module 2
• V. Printing unit / -e
• VI. Coating module / -e
• VII. Boom with dryer / drying line

Configuration D:

• I. Coating unit / paint module
• II. Intermediate dryer
• III. Printing / -e
• IV. Intermediate dryer
• V. Contractor 1
• VI. Coating module 2
• VII. Intermediate dryer
• VIII. Printing unit / s
• IX. Coating module / -e
• X. inspection system
• XI. Dryer / drying line
• XII. Boom with discharge

Configuration E:

• I. Inkjet printing unit
• II. Contractor 1
• III. Coating module 2
• IV. Printing unit / s
• V. Inkjet printing unit
• VI. Coating module / -e
• VII. Inspection System
• VIII. Drying section
• IX. boom

• anwendbare Druckverfahren:
  • alle konventionellen Druckverfahren
  • oder Verfahren mit UV-trocknenden Druckfarben
  • oder Mischverfahren z.B. mit Hybrite-Druckfarben und
• anwendbare Lackierungen:
  • konventionell wasserbasierende Lackierung
  • oder Lackierung mit UV-trocknenden Lacken.

The process technology described can be used in many ways in the production of corrugated board products. Here are

• applicable printing methods:
  • all conventional printing processes
  • or methods with UV-drying inks
  • or mixing process eg with Hybrite printing inks and
• Applicable coatings:
  • Conventional water-based coating
  • or varnishing with UV-drying varnishes.

The pressure in the applicator 1 for the adhesive or in the coating module 2 and in downstream, printing offset printing units or paint modules, which is set between the respective impression cylinder 4 and the press roller 3 and the respective rubber, blanket or form cylinders, respectively identical to each other and is for example 0.1 mm.
In particular, no so-called calendering unit with an additional and possibly even increased pressure is required after the coating of a transfer film 5.
In the event that after the coating of a transfer sheet 5 is not to be printed, the offset printing units run after the coating module 2 without Druckanstellung the rubber / blanket cylinder or forme cylinders against the impression cylinders 4 or they are as a sheet guiding cylinder with the lowest pressure (kiss-print ).

The characteristics of a rubber blanket used in the coating module 2 or a press fabric 10 to be used on the press roll 3 are explained below in more detail in accordance with FIG. 3.
The press roller 3, like the counter-pressure cylinder 4, has a cylinder channel 19. In the cylinder channel 19 clamping devices for fixing the press fabric 10 are provided. Such clamping devices are of Plattenzylindem or rubber or blanket cylinders, for example, in sheet-fed offset printing ago.

• Pressbespannung 10 als Gummituch mit kompressibler Zwischenschicht mit ähnlicher oder geringerer Dicke wie bei konventionellen Gummitüchern
• Drucktuch bzw. Pressbespannung 10 kombiniert aus einer Deckschicht, einer Schaumstoffzwischenlage und einer dimensionsstabilen Trägerschicht
• Pressbespannung 10 kombiniert aus flexiblem Gummituch mit diesem unterlegter Schaumstoffunterlage
• Pressbespannung 10 kombiniert aus Oberteil eines Gummituches mit diesem unterlegter Schaumstoffunterlage
• Pressbespannung 10 kombiniert aus einem geteilten Gummituch mit weicher Deckschicht und dieser unterlegter dimensionsstabiler Unterlage.

As press covers 10, the following elements can be used as single or combination elements:

• Press fabric 10 as a blanket with a compressible intermediate layer of similar or lesser thickness as conventional rubber blankets
• Blanket or press fabric 10 combined of a cover layer, a foam interlayer and a dimensionally stable support layer
• Pressing fabric 10 combined of flexible rubber blanket with this underlayed foam pad
• Pressing fabric 10 combined from upper part of a rubber blanket with this underlayed foam pad
• Press fabric 10 combined from a divided blanket with a soft cover layer and this underlaid dimensionally stable backing.

The surface of the press fabric 10 forms a press roll surface 20. The press roll surface 20 should be smooth and have the lowest possible adhesion to the transfer film 5 to be processed. This ensures that the layer transfer is optimal even for the smallest details and, on the other hand, the least possible friction between the press roll surface 20 and the transfer film 5 can be effective when the film feed is pulsed.

Such fabrics can be tensioned on the press roll 3 in the region within the cylinder channel.

• dass Inline-Beschichtung von einer Transferfolie auf Wellpappe mit vielfältigen Weiterverarbeitungsmöglichkeiten besteht und
• dass sich ein breites Anwendungsspektrum für das beschriebene Beschichtungsmodul 2 ergibt.

Advantages of the described method or of the method steps and combinations for the production of corrugated cardboard products are in particular

• that inline coating consists of a transfer film on corrugated board with a variety of processing options, and
• that results in a broad range of applications for the described coating module 2.

In contrast, hot stamping or Folienkaschiermaschinen work with increased Druckbeistellung, whereby the sensitive corrugated cardboard is deformed or deformed. The quality of the finished printed product is correspondingly poor.

LIST OF REFERENCE NUMBERS

1

commissioned

2

coating module

3

press roll

4

Impression cylinder

5

Transfer foil / foil web

6

transfer nip

7

roller drive

8th

Film supply roll

9

Foil composite role

10

Press covering

11

Inking / dampening unit

12

plate cylinder

13

Blanket / rubber / form cylinder

14

Folienleiteinrichtung

15

Printing plant security

16

dryer

17

Inspection device / monitoring system

18

dancer roll

19

cylinder gap

20

Press roll surface

21

chambered doctor blade

22

anilox roller

23

intermediate roll

Claims (20)

Process for coating corrugated cardboard in a sheet-processing machine, in particular a sheet-fed rotary printing machine,
characterized, in that , using a transfer film (5) formed from image-forming layers and a carrier film, the image-forming layers are transferred from the carrier film to corrugated cardboard sheets by - That at least with an applicator (1) for an imagewise coating of a sheet with an adhesive takes place, and in that by means of a coating module (2) the image-forming layers are transferred from the carrier film to the printed sheet, wherein in the coating module (2) an impression cylinder (4) and a press roller (3) form a common transfer gap (6), - Wherein the transfer film (5) through the transfer nip (6) is feasible, such that it is placed with the coated side on the guided on the impression cylinder (4) sheet and fed under pressure together with the sheet through the transfer nip (6) . - In which the imaging layer (s) after the exit of the printing sheet from the transfer nip (6) in the region of the adhesive provided with imagewise areas adheres to the printing sheet and is lifted from the carrier film. Method according to claim 1,
characterized,
is provided that the printing sheet in a coating work before the coating by means of the transfer foil (5) with a base layer. Method according to claim 1 or 2,
characterized,
that the printing sheet is provided with a label before or after the coating by means of the transfer foil (5). Method according to claim 2,
characterized,
in that the printed sheet is provided with a mark in the inkjet process during feeding to the sheet-processing machine in a sheet feeding device. Method according to claim 2,
characterized,
in that the printed sheet is provided with a marking or an imaging coating in the inkjet process during transport to a delivery of the sheet-processing machine in a sheet guiding device. Method according to claims 1 to 5,
characterized,
that the printed sheet is provided in one or more printing units after the coating by means of the transfer film (5) with a single- or multi-color printed image. Method according to claims 1 to 6,
characterized,
is provided that the printing sheet in a coating station on the coating by means of the transfer foil (5) with a covering layer. Method according to claims 1 to 7,
characterized,
pressing the printing sheet by means of drying means prior to, between or after the pre-coating by means of the transfer foil (5) and the further coating or printing works, is intermediate or final drying. Apparatus for carrying out a method according to claim 1 for the transfer of imaging layers from a carrier film to printed sheets at least with an applicator unit (1) for an imagewise coating of a printed sheet with an adhesive and with a coating module (2) for transferring the imaging layers from the carrier film to the printing sheet, the coating module (2) containing an impression cylinder (4) and a press roller (3) forming a common transfer nip (6), and wherein furthermore the carrier film can be guided around the press roll (3) such that it is placed with the coated side on the print sheet guided on the impression cylinder (4) and under pressure together with the print sheet through the transfer nip (6) between press roll (3 ) and counter-pressure cylinder (4) is guided and wherein the image-forming layers after the exit of the printing sheet from the transfer nip (6) in the region of the adhesive provided with imagewise areas adheres to the printing sheet and is lifted from the carrier film,
characterized,
in that on the press roll (3) a compressible press fabric (10) is provided which adapts to the surface of a corrugated cardboard. Device according to claim 9,
characterized,
that the press fabric (10) contains one or more surface-combinable elements which can be tensioned together on the press roll (3). Device according to claim 9 or 10,
characterized,
that the press fabric (10) is a blanket or includes parts of a blanket. Device according to claim 11,
characterized,
in that the press fabric (10) contains a layer of open or closed-cell foam as the compressible element. Device according to one of the preceding claims,
characterized,
that the sheet-processing machine for inkjet printing contains facilities. Device according to claim 13,
characterized,
in that a device for inkjet printing is assigned to the sheet feed to the sheet to be fed. Device according to one of the preceding claims,
characterized,
in that a device for inkjet printing is assigned to the coating module (2) for marking the transfer film (5) to be supplied to the transfer nip (6). Device according to one of the preceding claims,
characterized,
in that an apparatus for inkjet printing is assigned to the coating module (2) or a sheet transport device or the sheet delivery for marking coated printed sheets. Device according to one of claims 13 to 16,
characterized,
that one or more drying devices are arranged with IR or UV lamps for curing or drying the applied by means of inkjet printing in the coating module (2) or a sheet transport device or the sheet delivery on a printed sheet marks are or are. Device according to one of the preceding claims,
characterized,
in that one or more numbering devices are assigned to the coating module (2) or to a sheet transport device or to the sheet delivery for marking coated printed sheets. Device according to one of the preceding claims,
characterized,
that the sheet-processing machine is an offset press. Device according to one of the preceding claims,
characterized,
that the sheet-processing machine is a flexographic printing machine.

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