EP1940624B1 - Method and printing machine for the production of packaging and promotional materials - Google Patents

Description

The invention relates to a method and an apparatus for producing coated packaging and advertising means, including the transfer of image-forming layers from a carrier film to printed sheets according to the preamble of patent claims 1 and 9.

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, wherein by means of the press roller on the Counterpressure cylinder resting sheet is brought into contact with the film material. In this case, the downwardly lying metallic layer enters into a close connection with the areas provided with adhesive on the printed 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.

It is known to use such coating modules, for example in printing units of printing presses. A disadvantage of the known devices is that they can not be used flexibly. Furthermore, the surface design is often inhomogeneous due to the differently shaped surface properties of the different layers.

From the GB 2 259 888 A a device for film transfer printing is known. In it stickers are applied by hot foil transfer on a sticker carrier. The stickers can be printed with license plates or data. In another workstation lamination of the stickers from a laminate roll is provided.

From the WO 20051049322 A1 For example, a method and apparatus for combination pressure is known. Therein, a device for cold foil transfer is preceded or arranged by means for embossing or structuring. In this device, the printing substrate is deformed before coating by means of the transfer film or after the coating.

From the WO 95/031337 A1 an image transfer method is known in which applied to web-like material, an adhesive image and this subordinate a coating on the adhesive image is made. Furthermore, a variable coating substrate is provided.

The object of the invention is therefore to provide a method and a device by means of which the transfer of an imaging layer, e.g. a metallization layer, can be done on a sheet safely, economically and accurately, the device should be manageable for an extended range of applications for generating variable surface properties.

The solution to this problem results in a method according to the features of claim 1 and a device according to the features of claim 9.

According to the invention, an integrated print image design of film image components and printed image components is combined. To support the effect, a varnish layer of clear or translucent or colored varnish is applied to the printed sheet.
As a result, the printed image is protected and supported in a special way in its gloss effect. The drying is advantageously very fast, so that the further processing is not delayed.

According to the invention, a printing press becomes more flexible in its application in that a film transfer module is integrated. The film transfer module can be part of a workstation, run as a separate workstation, as an integrated workstation, or as a workable workstation.

Advantageously, the film transfer module can be arranged at different locations within a printing press depending on the application.

Therefore, it is also advantageously possible to provide a plurality of coating modules within a sheet-processing machine in a row. 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 image-forming 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 passing coating or metallization layer and superimposing in the following another, to apply the first enclosing adhesive pattern and to provide it with another imaging coating or metallization layer.
Furthermore, the film transfer module in a sheet-fed printing machine can also be arranged downstream of a device for the use of a sheet, so that an image-wise coating of the film transfer takes place on a sheet backside after previous front side printing

To improve the coating properties, the image-forming layer can be applied by means of what is known as UV negative-pressure ink, by means of a printing unit for the adhesive in e.g. is applied over an offset printing plate.

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

Figur 1

eine grundsätzliche Darstellung einer Druckmaschine mit einer Folientransfereinrichtung und

Figuren 2 bis 5

Konfigurationen zur Integration von Folientransfermodulen in einer Druckmaschine.

• In Figur 1 ist eine Bogen verarbeitende Maschine, hier eine Druckmaschine, gezeigt, die aus einem oder mehreren Druckwerken besteht, die für folgende Zwecke eingesetzt werden:
  • Ein zu beschichtender Druckbogen wird in einem ersten Arbeitschritt in einem Auftragwerk 1 (Druckwerk, Lackmodul, o. ä.) mit einem bildgebenden Klebstoffmuster versehen. Z. B. wird in einem Druckwerk einer Offsefdruckmaschine über Farb- und Feuchtwerke 11, eine Druckplatte auf einem Plattenzylinder 12, einen Drucktuch- oder Gummizylinder 13 ein Druckbogen an einem Gegendruckzylinder 4 bedruckt.
    Auftragwerke sind auch als Flexodruckeinheit oder Lackierwerk konfiguriert einsetzbar (siehe Ausführungsform in Fig. 4). Der Kleber kann mittels eines Dosiersystems 21 über eine Rasterwalze 22 und eine Übertragwalze 23 auf einen Formzylinder 24 übertragen werden, der hierzu eine Hochdruckplatte zur Erzeugung des bildgebenden Kleberauftrages trägt.
  • In einem zweiten Schritt wird in einem Beschichtungsmodul 2 gemeinsam mit dem Druckbogen eine Transferfolie 5 durch einen Transferspalt 6 geführt, wobei die Transferfolie 5 im Transferspalt 6 gegen den Druckbogen gepresst wird. Das Beschichtungsmodul 2 kann einem Druckwerk, einem Lackmodut, einer Basiseinheit oder einer andersartigen Verarbeitungsstation einer Bogenoffsetdruckmaschine entsprechen oder in diese integriert sein.
    Der Transferspalt 6 im Beschichtungsmoful 2 wird durch eine Presswalze 3 und einen Gegendruckzylinder 4 gebildet.
    Die Presswalze 3 kann der Drucktuchzylinder 13 eines Offsetdruckwerkes oder der Formzylinder eines Lackmodules einer Bogendruckmaschine sein. Der jeweilige Gegendruckzylinder 4 wird in der entsprechenden Verarbeitungsstation entsprechend bereitgestellt.
    Die Presswalze 3 ist mit einer Pressbespannung 10 oder als Wälze mit einer entsprechenden Beschichtung versehen. Die Pressbespannung 10 bzw. Pressbeschichtung kann beispielsweise als Kunststoffüberzug, vergleichbar einem Gummituch bzw. Drucktuch, ausgeführt sein. Die Oberfläche der Pressbespannung 10 bzw. Pressbeschichtung ist vorzugsweise sehr glatt. Sie kann auch aus antiadhäsiven Stoffen oder Strukturen gebildet sein.

Showing:

FIG. 1

a basic illustration of a printing machine with a film transfer device and

FIGS. 2 to 5

Configurations for the integration of film transfer modules in a printing machine.

• In FIG. 1 is a sheet-processing machine, here a printing press, shown, which consists of one or more printing units, which are used for the following purposes:
  • A sheet to be coated is provided in a first step in an applicator 1 (printing unit, paint module, o. Ä.) With an imaging adhesive pattern. For example, in a printing unit of an Offsefdruckmaschine on inking and dampening 11, a printing plate on a plate cylinder 12, a blanket or blanket cylinder 13, a sheet printed on a impression cylinder 4.
    Applicators can also be configured as a flexographic printing unit or coating unit (see embodiment in FIG Fig. 4 ). The adhesive can be transferred by means of a dosing system 21 via an anilox roller 22 and a transfer roller 23 to a forme cylinder 24, which carries for this purpose a high-pressure plate for generating the imaging adhesive application.
  • In a second step, a transfer film 5 is guided through a transfer nip 6 in a coating module 2 together with the printing sheet, wherein the transfer film 5 is pressed in the transfer nip 6 against the printing sheet. The coating module 2 may correspond to or be integrated in a printing unit, a lacquer module, a base unit or another type of processing station of a sheetfed offset printing press.
    The transfer nip 6 in the coating moful 2 is formed by a press roll 3 and an impression cylinder 4.
    The press roller 3 may be the blanket cylinder 13 of an offset printing unit or the forme cylinder of a lacquer module of a sheet-fed press. The respective impression cylinder 4 is provided accordingly in the corresponding processing station.
    The press roll 3 is provided with a press fabric 10 or as a roller with a corresponding coating. The press fabric 10 or Press coating can for example be designed 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.

• 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 Druckbogens unter erhöhtem Druck überwalzt werden soll.
• Weiterhin können dem Beschichtungsmodul 2 nachgeschaltet weitere Druckwerke einer Bogenoffsetdruckmaschine vorgesehen werden, wenn der beschichtete Druckbogen zum Bedrucken mit einem ein- oder mehrfarbigen Bild inline weiterverarbeitet werden soll.
• Weiterhin kann dem Beschichtungsmodul 2 nachgeschaltet ein so genanntes Lackiermodul vorgesehen werden, wenn der beschichtete Druckbogen zur Verbesserung der Haftung der Beschichtung, zum Schutz der Beschichtung, zur beschleunigten Trocknung und / oder zur Steigerung von Glätte und Glanz des Druckbogens mit einem entsprechenden Überzug versehen werden soll.

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 wad 3.

• 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.
• Furthermore, further printing units of a sheet-fed offset printing machine can be provided downstream of the coating module 2 if the coated printing sheet is to be further processed inline for printing with a single- or multi-color image.
• Furthermore, downstream of the coating module 2, a so-called painting module can be provided if the coated printing sheet is to be provided with a suitable coating to improve the adhesion of the coating, to protect the coating, to accelerate drying and / or to increase the smoothness and gloss of the printed sheet ,

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 imaging layer may, for example, be 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 transfer film 5 is assigned on a film supply roll 8 to the coating module 2 on the sheet feed side. The film supply roll 8 has a rotary drive 7, which is required for the continuous controlled feeding of the transfer film 5 to the coating module 2.

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 transfer film 5 can be guided around the press roll 3 (see dashed line illustration). The film web 5 can hereby be guided closely parallel to one another depending on the space conditions on one side of the coating module 2 in the feeding and discharging strand.

The transfer film 5 can also be passed substantially tangentially past the press roll 3 or can be passed through the press nip 6 only in a small circumferential angle, being fed from one side of the coating module 2 and discharged to the opposite side.

On the outlet side of the printing unit, a film collecting roller 9 is shown, on which the used sheet material is wound up. Again, a controllable rotary drive 7 is provided.

To improve the efficiency 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 controlled so that as far as possible the transfer film 5 is stopped when no transfer of the imaging layer should take place :

In reaction-fast timing systems via so-called dancer rollers 18, as exemplified in FIG. 1 are the control of the rotary actuators 7 of the film supply rolls 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.

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.

According to the invention, there are various possibilities for carrying out said image-wise coatings by means of an imaging or metallization layer within the working unit or printing units at different positions in a printing press.

Furthermore, an embodiment of an integrated film transfer module for use in a sheet-processing machine is possible. In this case, the coating module 2 can be embodied integrated in the structural unit of the commissioned work 1.

A sheet leading impression cylinder 4 has to transport sheets one or more gripper fields with associated pressure surfaces and a corresponding one to multiple extent. At the impression cylinder 4, an applicator 1 is arranged. The impression cylinder 4 is further a coating module 2, which has a press roll 3, which forms a transfer nip 6 with the impression cylinder 4. The transfer nip 6 is arranged downstream of the coating gap of the applicator 1 on the impression cylinder 4 in the sheet running direction.

In this way, an integrated film transfer module is formed, which has two workstations, which are used for the following steps. The printing material is guided in such a film transfer module in a very advantageous manner by all the necessary cleavage points in a single gripper closure, while it rests on a single impression cylinder 4.

The coating module 2 or integrated film transfer module is substantially suitable for printing a printed sheet before printing with an imaging layer, e.g. to provide a metallization layer. Within the coating module 2 or integrated film transfer module receiving sheet processing machine, for. B. a sheetfed offset printing press, the coating module 2 or integrated film transfer module but can also be placed at any other location within the machine. This is to enable the desired imaging layers, e.g. Metallization layers, both before, as well as after and between the application of printing ink layers can be done.

With the help of the device described high-quality packaging or advertising should be able to be effectively refined.

In principle, the arrangement of the coating module 2 or of the integrated film transfer module makes it possible to attach a film pattern of metal foil or effect foil to a printed sheet.

Depending on the quality of the printing material, it may be useful or necessary that the substrate is precoated to adapt the surface of the quality requirements of the finishing. For this purpose, the first printing unit or the applicator unit 1 and the coating module 2 or the integrated film transfer module is preceded by one or more coating modules L, which allow a primer layer to be applied to the printing sheet.

When applying the Fölienmusters then a conventional adhesive, similar to an offset printing ink can be used. Likewise, a UV adhesive can be used. In both cases, a predrying of the adhesive layer can take place.

When the film pattern is applied by the transfer films 5, it can be heated by means of appropriate devices in order to facilitate the solution of the imaging layer or metallization layer of the film carrier and thus to improve the transfer of the film pattern.

After applying the film pattern, a colored image can be printed on the film image. For this purpose, conventional offset printing inks or so-called film colors or so-called UV printing inks can be used in the corresponding printing units. The drying effect and the adhesion of the conventional printing inks on the film image is relatively poor, since they dry to a large extent by so-called knocking off. Film inks are generally oxidative curing inks that adhere better but also require a relatively long drying time. UV inks are used to achieve rapid drying using a UV dryer.

Depending on the type of ink used to make the colored image on the film image, it may be necessary to add a drying process for further processing of the print sheets. It is important here that the printed sheet has a certain inhomogeneity due to the virtually glued-on film image. It therefore requires a good dosage of drying energy.

Effectively, a not yet dried printed sheet carrying a film image and a color image can be prevented from being damaged or stained by applying a paint film. It is possible here to use dispersion varnishes, so-called primers in combination with dispersion varnishes or so-called UV varnishes. On the one hand, by means of such fast-drying lacquer layers, a print sheet provided with a coating of film image and printed image can be well protected, with the adhesive and printing ink layers can cure completely under the varnish layer. On the other hand, the surface of such a sheet is thereby additionally refined. The surface receives in addition to a uniform appearance and a very desirable gloss effect. In addition, the surface of the film image is protected against oxidative influences

The paints used are transparent or translucent and can be clear or colored. By means of appropriate color-lacquer combinations, eg. B. from conventional printing ink or using a so-called primer and a UV varnish, the surface of the sheet can also be provided with areas of different gloss.

1. a. Vorbeschichtung (mit Ausgleichs- oder Schutzmedium, ggf. in Abstimmung mit den Klebäreigenschaften)
2. b. Kleberauftrag (mit konventionellem oder UV-Kleber)
3. c. Ggf. Vortrocknung des Klebers
4. d. Folienauftrag (ggf. unter Anwärmung der Transferfolie)
5. e. Ggf. Nachtrocknung des Klebers
6. f. Ein oder mehrfarbiges Drucken eine Farbbildes unter Einschluss der Bereiche des Folienauftrages (mit konventioneller Offsetdruckfarbe oder Folienfarbe oder UV-Druckfarbe)
7. g. Ggf. Zwischentrocknung des gedruckten Farbbildes
8. h. Auftragen einer Glanz- bzw. Schutzschicht aus durchsichtigem Lack (mit einem Dispersionslack oder einem Primer in Kombination mit Dispersionslack oder einem UV-Lack)
9. i. Ggf. Endtrocknung des fertig beschichteten Druckbogens

The following production sequences can be specified from the described process steps:

1. a. Pre-coating (with leveling or protective medium, possibly in coordination with the adhesive properties)
2. b. Glue application (with conventional or UV glue)
3. c. Possibly. Predrying the glue
4. d. Foil application (if necessary under heating of the transfer foil)
5. e. Possibly. Post-drying of the adhesive
6. f. One or more color printing of a color image including the areas of the film application (with conventional offset printing ink or film ink or UV printing ink)
7. G. Possibly. Intermediate drying of the printed color image
8. H. Application of a gloss or protective layer of transparent lacquer (with a dispersion lacquer or a primer in combination with dispersion lacquer or a UV lacquer)
9. i. Possibly. Final drying of the finished coated printing sheet

• I. Auf einem einfachen, nicht glatten Bedruckstoff wird in einem Lackmodul eine Ausgleichsmasse aufgetragen, die die Oberfläche glatt und widerstandsfähig macht. In Verbindung mit dem nachfolgend aufgetragenen Kleber für das Folienbild ergeben sich besonders haftfeste Bereiche für die Metallisierungsschicht. Der Druckbogen wird nach Auftragen des Folienbildes mit einem mehrfarbigen Druckbild aus Folienfarbe bedruckt. Dies gilt insbesondere für Druckbogen mit einem hohen Flächenanteil des Folienbildes. Das Farbbild trocknet oxidativ und wird nicht geschützt. Es weist einen guten Glanz auf, ist aber relativ rau beim Berühren.
• II. Auf einem glatten Bedruckstoff wird ein Drucksujet eines UV-Klebers für das Folienbild aufgetragen, das zwischengetrocknet werden kann. Auf das Klebersujet wird eine Folien- oder Metallisierungsschicht übertragen und ggf. erneut zwischengetrocknet. Der Druckbogen wird nach dem Auftragen des Folienbildes mit einem ein- oder mehrfarbigen Druckbild aus UV-Druckfarbe bedruckt. Dies gilt für Druckbogen mit einem niedrigen bis hohen Flächenanteil des Folienbildes. Das Farbbild wird mittels eines UV-Trockners fertig getrocknet, wird aber in der Oberfläche nicht geschützt. Der Druckbogen weist einen guten Glanz auf und zeigt bei Berührung eine sehr gute Glätte.
• III. Auf einem glatten Bedruckstoff wird ein Drucksujet eines konventionellen Klebers für das Folienbild aufgetragen, auf das eine Folien- oder Metallisierungsschicht übertragen wird. Der Druckbogen wird danach mit einem ein- oder mehrfarbigen Druckbild aus konventioneller Offsetdruckfarbe bedruckt (Druckbogen mit niedrigem bis hohem Folienanteil). Das Farbbild wird ggf. mittels eines Trockners getrocknet. Auf den Druckbogen wird eine Schicht eines nicht sichtbaren Primers zur Haftvermittlung aufgetragen und danach mittels einer Schicht aus UV-Lack geschützt. Danach kann eine Endtrocknung erfolgen. Der Druckbogen weist einen sehr guten Glanz auf und ist beim Berühren sehr glatt auf. Die Glanzeffekte der Folienbereiche werden leicht gedämpft und so einem optisch ansprechenden Ausgleichseffekt unterworfen. Der Druckbogen ist sofort trocken und weiterverarbeitbar.
• IV: Auf einem glatten Bedruckstoff wird ein Drucksujet eines UV-Klebers für das Folienbild aufgetragen, auf das eine Folien- oder Metallisierungsschicht übertragen wird. Der Druckbogen wird danach mit einem einoder mehrfarbigen Druckbild aus UV-Druckfarbe bedruckt (Druckbogen mit niedrigem bis hohem Folienanteil). Das Farbbild wird ggf. mittels eines UV-Trockners getrocknet und mittels einer Schicht aus UV-Lack geschützt. Danach kann eine Endtrocknung erfolgen. Der Druckbogen weist einen sehr guten Glanz auf und ist beim Berühren sehr glatt auf. Die Glanzwirkung der Folienbereich, insbesondere auch von Effektfolien mit irisierenden oder brechenden Effekten, wird unterstützt und deren Wirkung deutlich hervorgehoben. Der Druckbogen ist sofort trocken und weiterverarbeitbar.

As possible product variants from the named production steps, some variants are described in more detail below.

• I. On a simple, not smooth substrate a leveling compound is applied in a paint module, which makes the surface smooth and resistant. In conjunction with the subsequently applied adhesive for the film image resulting in particularly adherent areas for the metallization. The printed sheet is printed after applying the film image with a multi-color printed image of film color. This applies in particular to printed sheets with a high areal proportion of the film image. The color image dries oxidatively and is not protected. It has a good gloss, but is relatively rough when touched.
• II. On a smooth substrate, a Drucksujet a UV adhesive for the film image is applied, which can be dried between. A film or metallization layer is transferred to the adhesive substrate and, if necessary, inter-dried again. The printed sheet is printed after applying the film image with a single or multi-color printed image of UV ink. This applies to printed sheets with a low to high area proportion of the film image. The color image is finished by means of a UV dryer, but is not protected in the surface. The printing sheet has a good gloss and shows a very good smoothness when touched.
• III. On a smooth substrate a Drucksujet of a conventional adhesive for the film image is applied to a film or metallization layer is transferred. The printed sheet is then printed with a single- or multi-color printed image from conventional offset printing ink (sheet with low to high film content). The color image is optionally dried by means of a dryer. A layer of an invisible primer is applied to the printing sheet for adhesion promotion and then protected by means of a layer of UV varnish. Thereafter, a final drying can take place. The sheet has a very good gloss and is very smooth when touched. The gloss effects of the film areas are slightly dampened and so on subjected to visually appealing balancing effect. The printed sheet is immediately dry and processable.
• IV: On a smooth substrate a Drucksujet a UV adhesive for the film image is applied to which a film or metallization layer is transferred. The sheet is then printed with a single or multi-color printed image of UV ink (sheet with low to high film content). The color image is optionally dried by means of a UV dryer and protected by means of a layer of UV varnish. Thereafter, a final drying can take place. The sheet has a very good gloss and is very smooth when touched. The gloss effect of the film area, in particular of effect films with iridescent or refractive effects, is supported and their effect clearly highlighted. The printed sheet is immediately dry and processable.

In the FIGS. 2 to 5 various combinations of the assignment of coating modules 2 and applicators 1 to a printing press for carrying out the described production method for packaging means or advertising means are shown schematically.

The printing presses shown may be preceded by one or more paint modules L in all the configurations shown according to an investor AN provided film transfer modules or printing units D, in order to allow the application of a leveling layer, primer layer or a different kind of pre-coating of printed sheets

In all configurations shown, the printing units D'can be followed by one or more coating modules L in front of a delivery AU. This makes it possible to apply a single-layer or multi-layer transparent and thereby clear, glossy or colored cover layer. Between such paint modules L, an intermediate dryer can be arranged.

FIG. 2 basically shows a conventional configuration. A sheet feeder AN of the sheet-fed printing machine is initially followed by an applicator 1 and then a coating module 2. The coating module 2 is again followed by printing units D of the sheet-fed printing machine. A bow boom AU completes the configuration.

By means of this configuration, therefore, an imagewise coating with metallized film can take place on the empty printed sheet. Thereafter, a multicolored printed image can be applied over this coating.

Likewise, by means of the coating module 2, a full-surface coating with metallized film can be produced, which can subsequently be overprinted in the printing units D.

It is indicated that a coating module 2 can also be subordinated to the printing units D in front of the sheet delivery AU, wherein the printing unit D upstream of the coating module 2 can serve as a commissioning unit 1.

By means of this arrangement, for example, a subsequent lamination or the support of a metallized image-wise coating without overprinting possible. For this, the color print should be dried beforehand.

FIG. 3 shows a similar configuration as FIG. 3 , Here, the sheet feeder AN downstream of two film transfer modules as integrated coating modules IM. In this case, both a coating module 2 and an associated application unit 1 are arranged within a work unit (see also FIG Fig. 2 ). Thus, according to a previously mentioned method example, the image-wise application of two different, next to each other, but possibly cross-over coatings are made. The arrangement of an integrated coating module IM is particularly useful if at least two film transfer modules are to be arranged directly one after the other.

In FIG. 4 is shown a flexible variants for a printing press with further improved features of the further processing of signatures. The film transfer module is designed here as an attachment module AM. Such a top module AM is preferably designed as a transportable unit and can be on a standardized substructure UB a printing unit D of the printing press are placed. For this purpose coupling mechanisms are necessary, which can be represented in many ways. A substructure UB normally includes a frame in which a sheet transport drum and an impression cylinder 4 are associated with each other. Optionally, a printing blanket cylinder 13 of an offset printing unit or a forme cylinder 20 of a lacquer module can each be assigned to the counterpressure cylinder 4 on the substructure. The blanket cylinder 13 or forme cylinder 20 can be used in conjunction with the coating module 2 as a press roller 3, wherein a corresponding fabric 10 is to be attached. Corresponding clamping devices are available on both cylinder types.

In FIG. 5 is an advanced version shown. The printing press shown has, after two printing units D connected to the sheet feeder AN, a so-called turning device W. Turning devices W serve to invert a single-sided printed or coated printed sheet during sheet-fed operation of a sheet-fed printing press, so that its previous underside becomes the upper side, which can subsequently be printed or coated.

In the configuration shown, the applicator 1 and a coating module 2 adjoin the turning device W. Thereafter, if necessary, several further printing units D are provided up to the sheet delivery AU.

With such a printing press, each printed sheet can first be printed on its reverse side in one or two colors, then turned over, then image-coated with a metallized layer and subsequently printed again in multiple colors. An application example of this are greeting cards with jewelery inserts made of metal foil on the image page.

The configurations shown are given by way of example. In the context of the modularization of the film transfer modules, as has been described in detail above, the skilled person can easily find further applications.

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 / blanket cylinder

14

Folienleiteinrichtung

15

Printing plant security

16

dryer

17

Inspection device / monitoring system

18

dancer roll

19

cylinder gap

20

form cylinder

21

applicator roll

22

dosing

D

printing unit

W

turning device

AT

sheet feeder

AU

sheet delivery

UB

substructure

IN THE

Integrated film transfer module

AT THE

plug-in module

L

coating module

Claims (11)

1. A method for generating imaging layers from a transfer foil (5), wherein in a foil transfer module at least by means of one application unit (1) a pictorial coating of the print sheets with an adhesive takes place and by means of a coating module (2) the application of a foil image subject to transferring at least parts of the imaging layers from the transfer foil (5) onto the print sheet takes place in the following,
   characterized in that a print image is generated on a print sheet subject to the inclusion of a foil image in a sheet-fed offset printing press having multiple printing couples (D) for generating a colour print in that following the application of the foil image a printing-over of the print sheet with a monochrome or polychrome print image by means of printing inks subject to the inclusion of the image regions of the foil image takes place and that following the application of the print image single or multiple coating of the combined foil and print image by means of a transparent or translucent coating takes place, wherein for printing the print sheets with the monochrome or polychrome print image a conventional offset printing ink or an oxidatively drying foil ink or a UV-printing ink is used and wherein for coating the print sheet with a single or multiple layer coating a dispersion varnish or a combination of an adhesion-promoting primer and a UV-varnish or a UV-varnish is used.
2. The method according to Claim 1, characterized in that prior to the application of the foil image a single or multiple layer pre-coating of the print sheet takes place in one or multiple varnish modules arranged upstream of the foil transfer module.
3. The method according to Claim 2, characterized in that for the single or multiple layer pre-coating of the print sheet a medium is used, the adhesive strength of which is matched with respect to the adhesive or which is increased through the adhesive.
4. The method according to Claim 1 to 3, characterized in that for printing the print sheet carrying a foil image a monochrome or polychrome print image is applied by means of conventional offset printing ink or foil printing ink and thereafter for coating the print sheet with a single or multiple layer coating a dispersion varnish is applied over the entire area or part area.
5. The method according to Claim 1 to 3, characterized in that for printing a print sheet carrying a foil image a monochrome or polychrome print image is applied by means of conventional offset printing ink or foil printing ink and thereafter for coating the print sheet with a single or multiple-layer coating an adhesion-promoting primer is initially applied over the entire area or part area and thereafter a UV-varnish is applied over the entire area or part area.
6. The method according to Claim 1 to 3, characterized in that for printing the print sheet carrying a foil image a monochrome or polychrome print image is applied by means of UV-printing ink and thereafter for coating the print sheet with a single or multiple layer coating a UV-varnish is applied over the entire area or part area.
7. The method according to Claim 6, characterized in that for the pictorial coating of the print sheets a UV-adhesive is used prior to the transferring of the foil image.
8. The method according to Claim 1 to 7, characterized in that following the pictorial coating of the print sheets with an adhesive and/or following the transfer of the foil image and/or after the application of printing inks and/or after the application of the single or multiple layer coating, drying takes place.
9. A sheet-fed offset printing press having multiple printing couples (D) for generating a colour print, with a device for carrying out the method according to Claim 1 with a foil transfer module for transferring imaging layers from a transfer foil (5) onto print sheets at least with one application unit (1) for a pictorial coating of the print sheets with an adhesive and with a coating module (2) for transferring the imaging layers from the substrate foil onto the print sheet in a transfer nip (6) between an impression cylinder (4) and a press roll (3), wherein the substrate foil with the coated side contacting the print sheet can be guided jointly with the latter through the transfer nip (6) and in the process the imaging layers can be pictorially transferred onto the print sheets, characterized in that in the sheet-fed offset printing press the foil transfer module comprises a coating module (2) as a structural unit and a device for feeding a fresh foil web from a supply and for disposing consumed foil web, as well as means for guiding the foil web to the transfer nip (6) to and away from the transfer nip (6), in that the coating module (2) is assigned an application unit (1) and in that assigned to the first or last printing couple (D) provided in the sheet-fed offset printing press one or multiple varnish modules (L) are arranged downstream and in that the foil transfer module is arranged upstream or in between the printing couples (D).
10. The sheet-fed offset printing press according to Claim 9, characterized in that the foil transfer module is embodied as an integrated working unit, wherein an application unit (1) each assigned to the coating module (2) is arranged within each working unit.
11. The sheet-fed offset printing press according to Claim 9 or 10, characterized in that before and/or after the foil transfer module and/or after the printing couples (D) and/or after the varnish modules (L) dryers are arranged.

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