EP1803563B1 - Method for cold film embossing - Google Patents

Description

The invention relates to an apparatus and a method for transfer of imaging layers from a carrier film to printed sheets according to the preamble of claims 1, 6 and 16; which from the document WO 2005/100025 are known.

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.
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.

The object of the invention is therefore to provide 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. In particular, a partial film application is to be made possible.

The solution of this problem results in a device according to the features of patent claims 1 and 6 and in a method according to the features of claim 16.

Advantageously, the device is characterized in that a press roller has a pressing surface which occupies a partial area of the total area of a printed sheet.

Advantageously, such press surfaces are designed as tensionable segments or as cut-out rubber blankets or as passably produced, preferably photopolymer high-pressure plates or as detachable, for example under magnetic action, attachable pressing segments.

• Ein so genanntes gestripptes Gummituch, bei dem die druckende Oberfläche bis auf die wirksame Fläche entfernt wurde
• eine polymere Schneidplatte z.B. aus der Klischeeherstellung mittels eines Flachbettplotters, ggf. auch mit einem Trägermaterial aus Aluminium oder Polyester
• eine Fotopolymerplatte z.B. aus einer Belichtung ggf. mit Aluminiumblech/folie als Trägermaterial.
• Verwendbar ist auch ein Gummituch, das auf einem Metallträger aufgebracht ist; ein solches Gummituch kann ggf. eine dämpfende Zwischenschicht aufweisen und mit einer dünnen, aber harten und glatten Deckschicht versehen sein.

Different working materials can be used for this purpose. Can be used

• A so-called stripped rubber blanket with the printing surface removed to the effective area
• a polymeric cutting plate, for example, from the cliché production by means of a Flachbettplotters, possibly also with a substrate made of aluminum or polyester
• a photopolymer plate, for example, from an exposure optionally with aluminum sheet / foil as a carrier material.
• Also usable is a blanket which is applied to a metal support; Such a blanket may optionally have a cushioning intermediate layer and be provided with a thin but hard and smooth cover layer.

As a substructure of the corresponding partial pressing fabric is provided, a pad with or without damping effect, e.g. to use a vacuum blanket.

As clamping systems arise a clamping spindle as in a blanket cylinder known or so-called combination spar rails for printing blankets or printing plates, as are known from the blanket cylinders or the form of cylinders. Depending on the structure, the surface of the press cylinder elevator is also suitable for profiled embossing.

This results in an extended range of applications for the process of cold foil stamping. The makeready shortening is achieved by prepared press cylinder lifts. In addition, register automation can be introduced.

As a solution, add the press cylinder to a register system, e.g. is executed via register pins. The press cylinder should be adjustable e.g. in the manner of a register system for automatic printing plate tension. The side and circumferential register can be adjustable as in a forme cylinder. In addition, the press cylinder elevator can be provided with register punches.

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 The aforementioned methods can be used side by side so also different types of films.

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 counter-pressure cylinder, the film feed is stopped, wherein the press roller 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.

Showing:

FIG. 1

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

FIG. 2

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

FIG. 3

a press roll of a coating module and

FIG. 4

a detail of the press roll.

• Ein Druckbogen wird zunächst mit einem flächigen oder bildgebenden Klebstoffmuster versehen (Druckwerk als Auftragwerk 1).
• Im Folgedruckwerk wird der Druckbogen gemeinsam mit einer Transferfolie 5 unter Pressung durch einen Transferspalt 6 geführt, (Beschichtungswerk 2).

FIG. 1 shows parts of a sheet-fed rotary printing press, which contains two printing units and is used for the following purposes:

• A printed sheet is first provided with a two-dimensional or imaging adhesive pattern (printing unit as commissioned work 1).
• In the following printing unit, the printed sheet is guided together with a transfer film 5 under pressure through a transfer nip 6 (coating unit 2).

The applicator 1 may be a per se known offset printing unit with an inking unit 11, a plate cylinder 12 and a blanket cylinder 13. The blanket cylinder 13 cooperates with a counter-pressure cylinder 4.

The coating unit 2 can also be formed by an offset printing unit. The transfer nip 6 in the coating unit 2 is formed by a press roll 3 and an impression cylinder 4. The press roller 3 may correspond to the blanket cylinder. The press roll 3 may also correspond to the forme cylinder of a paint module. Within the coating unit 2 used for the film transfer, a web guide 14 for transfer films is shown. The transfer film 5 is thereby switched on and executed by protective devices 15 of the coating unit 2.

Alternatively, as shown in the context of applicator 1, an integrated in the applicator 1 film transfer device may be provided, whereby an integrated film application module is created. In this case, a press roll 3 'is assigned downstream of a printing gap between a blanket or forme cylinder 13 and the impression cylinder 4 on a counter-pressure cylinder 4. Thus, a film web 5 'of a transfer film after the coating of the printing material by means of the applicator 1 to a transfer gap formed as mentioned above 6' fed and also be discharged directly again. The cold foil stamping takes place in a single integrated foil application module FA, as in FIG. 1 indicated.

As in FIG. 1 schematically shown in the order unit 1, can be arranged in an integrated film application module FA and a contractor in a compact design within the coating module. For this purpose, an adhesive application device 1 'associated with the impression cylinder 4 and the transfer gap, which would be provided here between the blanket cylinder 13 and the impression cylinder 3, be arranged upstream. The transfer film would be guided here around the blanket cylinder 13 or approximately tangentially past it through the designated printing nip.
Such an adhesive applicator device 1 'may consist of a compact forme cylinder for supporting a printing form for the adhesive and an applicator of a chamber doctor blade and an anilox roller for supplying the adhesive. In this case, on the same counter-pressure cylinder 4, in turn, the adhesive application is first carried out on the printing substrate and the film application is carried out immediately thereafter.

The film supply roll 8 is assigned to the coating unit 2 on the sheet feed side. The film supply roll 8 has a rotary drive 7 for the continuous controlled feeding of the transfer film to the coating unit 2. In the film feed deflection or tension rollers for guiding the transfer film 5 may be provided in a substantially constant tension against the press roller 3. On the downstream side of the printing unit, a film collecting roller 9 is provided for the used sheet material. One Rotary drive 7 on the film collection roller 9 is always advantageous. It can even be provided that the transfer film 5 is conveyed on the outlet side by means of the rotary drive 7 and held taut on the inlet side by means of a brake.

The press roll 3 (as a blanket cylinder or forme cylinder or separate press roll) carries on its surface a compressible or damping, e.g. also provided with a compressible intermediate layer element. The press roll 3 is provided with a press fabric 10, for example, as a plastic coating, comparable to a blanket or blanket, which can be held in a cylinder channel on jigs.

To ensure the efficiency of the coating process can be provided, the film feed of the transfer film 5 from the film supply roll 8 to the transfer nip 6 and the film collection roller 9 is gradually controlled, the transfer film 5 is then stopped, if no transfer of imaging or covering layers should take place.
The associated device preferably includes a corresponding feed control for the transfer sheet 5, which ensures that at least the lying in the region of the press roller 3 and the impression cylinder 4 part of the film web is stationary as long as the cylinder channel passes.

A further improvement of the film utilization of the type described results when 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, dryer 16 can be provided in the film application module thus formed from the applicator 1 and the coating unit 2, by means of which the adhesive application or the entire film coating can be dried. Here, for example, UV dryers come into question.

Furthermore, the film application module may include a monitoring device 17 for scanning the sheet surface. The monitoring device 17 enables the evaluation of image contents of the coating and the detection of defects in the film coating. Such a monitoring device can also be provided in conjunction with the printing press, in which the film application module is integrated. Then it can be arranged for example in the sheet delivery of the printing press or a last printing unit.

According to Fig. 2 For example, the coating module may be provided with means for conditioning the transfer film in order to improve the layer transfer and the coating result. In this case, the film web 5 can be influenced by means of the film guiding device 14.

In a particular embodiment of the invention, a contoured or segmented pressing surface 21 should be provided as the surface of the press roll 3. For this purpose, instead of a whole-area pressing surface 20, a segmented pressing surface 21 limited to one or more regions to be coated is used on the pressing roller 3.
The segmented pressing surface 21 may be formed as an isolated surface element, as an annular, narrow surface element encircling the press roll 3, as a surface line following a limited peripheral portion covering over the width of the press roll 3 reaching surface element or in the form of several such surface elements.

For this purpose, a cut-out printing blanket, an imageable plastic high-pressure mold or a pressure pad 22, which may preferably be releasably fastened, optionally stickable or magnetically attachable, can be used to support the segmented pressing surface 21. A provided on its underside with a magnetic adhesive surface Andrucksegment 22 may for example be placed directly on the surface of the press roll 3. On the other hand, a magnetic film can also be clamped onto the surface of the press roll 3, to which then a contact pressure segment 22 with a magnetically adhering rear side can be placed for affixing or positioning the segmented press surface 21 is. The surface and the internal structure of the Andrucksegmentes 22 should correspond to the information described above in terms of elasticity and smoothness. Here, a compressible pad 23 may be provided which carries a preferably smooth relatively firm functional layer 24.

The function of this limited segmented pressing surface 21 is that - as in the passage of the cylinder channel 19 - the entrapment of the transfer film 5 is given only if the segmented pressing surface 21, the transfer film 5 touching the transfer nip 6 passes. In other words, the pressing surface 21 should only act on the transfer film 5, where actually imaging layers are to be transferred from the transfer film 5 to the printing sheet.

1. I. Zunächst kann zur Ausführung einer Folientaktung die Transferfolie 5 in sehr vorteilhafter Weise auch dann im Vorschub angehalten werden, wenn der zu beschichtende Bereich irgendwo innerhalb des Bildbereiches des Druckbogens liegt und noch nicht den Bereich der segmentierten Pressfläche 21 erreicht hat oder der Bereich der segmentierten Pressfläche 21 schon vor dem Ende des zu beschichtenden Bogenbereiches endet. Die Transferfolie 5 muss also nur dann transportiert werden, wenn die segmentierte Pressfläche 21 innerhalb des Transferspaltes 6 zwischen Presswalze 3 und Gegendruckzylinder 4 im Eingriff ist. So kann die Ausnutzung der Transferfolie 5 zwischen den zu beschichtenden Druckbogen fast vollständig erfolgen.
   Der Folientransport wird hierbei beim Einsatz einer ringförmigen Pressfläche 21 nur beim Kanaldurchlauf angehalten.
   Beim Einsatz von Pressflächen 21 in Form einzelner oder mehrerer, zylinderbreiter, über Teilumfänge reichender Segmente kann der Folienvorschub zusätzlich während freier Flächen am Umfang der Presswalze 3 angehalten werden.
2. II. Eine weitere Verbesserung der Folienausnutzung der beschriebenen Art ergibt sich dadurch, dass die Transferfolie 5 in eine oder mehrere Teilfolienbahnen geringerer Breite aufgeteilt wird. Die ist insbesondere in Verbindung mit der segmentierten Pressfläche 21 von großem Vorteil. Bei einer segmentierten Pressfläche 21 kann die Transferfolie 5 auf die Breite der Pressfläche 21 beschränkt eingesetzt werden. Die Einsparung beim Folienverbrauch ist bedeutend. Die Folienführung im Transferspalt 6 wird durch eine vollflächige Auflage einer schmalen Bahn der Transferfolie 5 auf der segmentierten Pressfläche 21 - zumindest im Transferspalt 6 - deutlich verbessert.
   Damit kann bei entsprechender Steuerung mit Hilfe der Einrichtung bzw.
   Einrichtungen zur Taktung des Folienvorschubes jeder der Teilfolienbahnen, die Ausnutzung der Transferfolie 5 auch bei zonal unterschiedlich langen Beschichtungsbereichen innerhalb eines Bogens verbessert werden.
   Dazu wird jede Teilfolienbahn nur genau in dem Bereich weitergefördert, wo die bildgebende Oberflächenschicht aufzutragen ist. In den nicht zu beschichtenden Bereichen kann jede Teilfolienbahn unabhängig von den anderen Teilfolienbahnen stillgesetzt werden, wobei damit kein unnötiger Folienverbrauch entsteht.

Thus, two effects can be achieved in the coating module:

1. I. First, to carry out a film timing, the transfer film 5 can be stopped in advance in a very advantageous manner, even if the area to be coated lies somewhere within the image area of the signature and has not yet reached the area of the segmented press area 21 or the segmented area Pressing surface 21 ends before the end of the arch area to be coated. The transfer film 5 therefore only has to be transported if the segmented pressing surface 21 is in engagement within the transfer nip 6 between the press roll 3 and the impression cylinder 4. Thus, the utilization of the transfer film 5 between the sheets to be coated can be almost complete.
   The film transport is in this case stopped when using an annular pressing surface 21 only in the channel passage.
   When using pressing surfaces 21 in the form of single or multiple, cylinder-wide, sub-segments reaching segments of the film feed can be additionally stopped during free areas on the circumference of the press roll 3.
2. II. 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. This is particularly advantageous in connection with the segmented pressing surface 21. In a segmented pressing surface 21, the transfer film 5 can be used limited to the width of the pressing surface 21. The savings in film consumption is significant. The film guide in the transfer nip 6 is significantly improved by a full-surface support of a narrow web of transfer film 5 on the segmented pressing surface 21 - at least in the transfer nip 6.
   Thus, with appropriate control by means of the device or
   Means for timing the film feed of each of the partial film webs, the utilization of the transfer film 5 are 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.

In combination with the above-mentioned method, it is thus also possible to use different types of film side by side. This allows surfaces of different film color or different smoothness or texture to be created.

• ein so genanntes gestripptes Gummituch, d.h. ein Drucktuch bei dem die druckende Oberfläche aus Gummi bis auf die beim Prägen zur Wirkung zu bringende Fläche entfernt wurde
• eine so genannte polymere Schneidplatte, die z.B. aus der Klischeeherstellung für Flexodruckanwendungen stammt und mittels eines Flachbettplotters herstellbar ist; ggf. kann diese auch mit einem Trägermaterial aus Aluminium oder Polyester ausgerüstet sein
• eine Fotopolymerplatte, die z.B. für den Flexodruck Anwendung findet und deren Oberflächenkonturierung mittels eines Belichtungs- und Auswaschvorganges herstellbar ist; ggf. ist auch diese mit einem Aluminiumblech bzw. einer Aluminiumfolie als Trägermaterial versehen.
• Verwendbar ist auch ein Gummituch mit einem Metallträger, das sich wie ein gestripptes Gummi- bzw. Drucktuch vorbereiten und einsetzen lässt.

For the construction of the partial press fabric, different working materials known per se can be used. Can be used

• a so-called stripped rubber blanket, ie a blanket in which the rubber printing surface was removed except for the area to be impacted during embossing
• a so-called polymeric cutting plate, for example, from the cliché production for flexographic printing applications and can be produced by means of a flatbed plotter; if necessary, this can also be equipped with a carrier material made of aluminum or polyester
• a photopolymer plate, which is used for example for flexographic printing and whose surface contouring can be produced by means of an exposure and Auswaschvorganges; if necessary, this is also provided with an aluminum sheet or an aluminum foil as a carrier material.
• It is also possible to use a rubber blanket with a metal carrier that can be prepared and used like a stripped rubber or blanket.

As a substructure of the corresponding partial pressing fabric is provided, a pad with or without damping effect, e.g. to use a vacuum blanket. A substructure is only suitable for press fabrications that do not contain rigid metal layers.

As clamping systems arise a clamping spindle as in a blanket cylinder known or so-called combination clamping rails for blankets or printing plates, as known from the blanket cylinders or the form of cylinders. Depending on the structure, the surface of the press cylinder elevator is also suitable for profiled embossing.

This results in an extended range of applications for the process of cold foil stamping. The makeready shortening is achieved by prepared press cylinder lifts. In addition, register automation can be introduced.

To solve is added that the press roller 3 may be performed with a register system, for example via register pins or register stops. Correspondingly, the press fabric 10 or the support of the press fabric 10 may be provided with register punches corresponding thereto. Thus, the press fabric 10 itself or on a carrier at any time register exactly on the press roller 3 can be clamped and the position of the press segments is always accurately determined.

The tensioning of the press fabric 10 or of the press fabric 10 carrying press segments on the press roll 3 can take place by means of an automatic feed and tensioning device. Then it becomes possible to prepare the press fabric 10 outside of the coating unit 2 and to automatically clamp it during other set-up operations.

The press roller 3 should also be adjustable. This can e.g. in the manner of a register system for automatic printing plate tension. For this purpose, a so-called page register and a circumferential register of the press roller 3 is comparable as in a plate cylinder or forme cylinder adjustable. Likewise, the counter-pressure cylinder for positioning the sheet can be registered relative to the pressing roller 3 carrying the pressing segments. Furthermore, registration of the printed sheets itself by means of sheet transport drums arranged between the printing units is possible both in the circumferential direction as well as in the lateral direction as well as in the diagonal direction.

Using the above elements, a very simple and fast handling of the device of the film application module is possible.

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

Press area

21

segmented pressing surface

22

Andrucksegment

23

document

24

functional position

Claims (21)

1. A device for the transfer of imaging layers from a substrate foil 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 sheets in a transfer nip (6) between an impression cylinder (4) and a press roller (3), wherein the substrate foil can be guided with the coated side contacting the print sheet jointly with the latter through the transfer gap (6) and in the process the imaging layers can be pictorially transferred onto the print sheet, and with a device for feeding the transfer foil (5) to the coating unit (2) and for discharging from the coating unit (2) with a drive for moving the transfer foil in working direction, wherein the foil feed of the transfer foil (5) is controllable by means of a device for the foil guidance in such a manner that the transport of the transfer foil (5) is stopped in particular when in the transfer nip (6) of the coating unit (2) no transfer of an imaging layer onto a print sheet takes place, and wherein the press roller (3) is provided with a covering (10),
   characterized in
   that the press covering (10) contains arrangement for the accurately fitting fastening on the press roller (3) or
   that the press covering (10) or a carrier of the press covering (10) comprises one or multiple register punchings.
2. The device according to claim 1,
   characterized in
   that a control in conjunction with a foil guide of the transfer foil (5) is provided in such a manner that at least when during the passing through of a gripper of the sheet guiding impression cylinder (4) receiving cylinder channel (19) of the press roller (3) the foil feed is stopped, wherein the press roller (3) slidingly runs through subject to further contacting of the transfer foil (5).
3. The device according to claim 1 or 2,
   characterized in
   that as surface of the press cylinder (3) an elevated press area (21) which is contoured in the outline is provided, wherein the press area (20, 21) is limited to the region to be maximally coated.
4. The device according to claim 1 to 3,
   characterized in
   that on the surface of the press roller (3) a cutout blanket or a plastic high-pressure forme processed according to the contoured press area (13) to be coated is arranged in an accurately fitting manner with respect to the area of the print sheet to be coated.
5. The device according to claim 4,
   characterized in
   that on the surface of the press roller (3) or on the covering (10) of the press roller (3) a pressure segment (22) which is contoured according to the area to be coated, that can be glued on or otherwise fastened, preferably releasably, such as for example a magnetically held pressure segment (22) for forming a segmented press area (21) is provided.
6. The device for the transfer of imaging layers from a substrate foil 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 sheets in a transfer nip (6) between an impression cylinder (4) and a press roller (3), wherein the substrate foil with the coated side contacting the print sheets 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 sheet, and with a device for feeding the transfer foil (5) to the coating module (2) and for discharging from the coating module (2) with a drive for moving the transfer foil in working direction, wherein the transfer foil (5) is divided into one or multiple part foil webs of a smaller width and the part foil webs are fed to the transfer nip (6) positioned or next to one another, and wherein the press roller (3) is provided with a covering (10),
   characterized in
   that the press covering (10) includes arrangements for the accurately fitting fastening on the press roller (3) or
   that the press covering (10) or a carrier of the press covering (10) comprises one or multiple register punchings.
7. The device according to claim 6,
   characterized in
   that the part foil webs are provided with imaging layers which are different from one another, wherein layers of different colour and/or different gloss and/or different surface structure can be generated.
8. The device according to claim 6 or 7,
   characterized in
   that as surface of the press cylinder (3) an elevated press area (21) which is contoured in the outline is provided, wherein the press area (20, 21) is limited to the region to be maximally coated.
9. The device according to claim 6 to 8,
   characterized in
   that on the surface of the press roller (3) a cutout printing blanket or a plastic high-pressure forme processed according to the press area (13) contoured according to the region to be processed is arranged accurately fittingly with respect to the area of the print sheet to be coated.
10. The device according to claim 9,
    characterized in
    that on the surface of the press roller (3) or on the covering (10) of the press roller (3) a pressure segment (22) which is contoured according to the region to be coated, can be glued on or which is to be fastened otherwise, preferably releasably, such as for example magnetically held pressure segment (22) for forming a segmented press area (21) is provided.
11. The device according to claim 1 to 10,
    characterized in
    that the press roller (3) includes a device for the positioning of the position of the press covering (10) relative to the impression cylinder (4) cooperating with the latter.
12. The device according to claim 11,
    characterized in
    that the press roller (3) includes a register device for positioning the position of the press covering (10) on the press roller (3) in conjunction with the register punching.
13. The device according to claim 12,
    characterized in
    that the register device is provided in conjunction with clamping devices for the press covering (10) or a carrier for the press covering (10).
14. The device according to claim 1 to 13,
    characterized in
    that on the press roller (3) an automatic clamping device for the register-appropriate clamping of the press covering (10) or of the carrier for the press covering (10) is provided.
15. The device according to claim 14,
    characterized in
    that the automatic clamping device for the register-appropriate clamping of the press covering (10) or of the carrier for the press covering (10) on the press roller (3) is rendered effective in conjunction with the register device or the register punching.
16. A method for the coating of print sheets in a sheet-processing machine, in particular a sheet-fed rotary printing press subject to using a transfer foil (5) formed of imaging layers and a substrate foil for the transfer of imaging layers from the substrate foil onto the print sheets in that

    - at least with one application unit (1) a pictorial coating of a print sheet with an adhesive takes place, and

    - in a coating module (2) a transfer foil (5) is inserted, in the imaging layers of which on the substrate foil image elements are arranged in such a manner that their image side is adheringly arranged on the substrate foil,

    - in that by means of a coating module (2) a transferring of the imaging layers or image elements from the substrate foil onto the print sheet takes place, wherein in the coating module (2) an impression cylinder (4) and a press roller (3) form a common transfer nip (6),

    - wherein the transfer foil (5) can be guided through the transfer nip (6) in such a manner that it is guided through the transfer nip (6) with the coated side placed onto the print sheet guided on the impression cylinder (4) and under pressure jointly with the print sheet,

    - wherein the imaging layer/s or image elements following the exit of the print sheet from the transfer gap (6) in the region of the pictorial regions provided with adhesive surface-conformingly adheres to the print sheet and is lifted off the substrate foil,

    - in that the transfer foil (5) in the transfer nip (6) is pressed against the print sheet only in the region of the pictorial coating/s and

    - in that the press covering (10) or a carrier of the press covering (10) is clamped register-accurately onto the press roller (3).
17. The method according to claim 16,
    characterized in
    that on the press roller (3) one or multiple pressure segments (22) are attached, which have a press area (21), the area of which is matched to the area extent of the pictorial coatings and in that transfer foil (5), seen axially to the press roller (3), is fed to the transfer nip (6) merely in the region of axial portions provided with press areas (21).
18. The method according to claim 17,
    characterized in
    that the transfer foil (5) is fed to the transfer nip (6) in the form of part foil webs in the axial portions in which there is occupancy with press areas (21).
19. The method according to claim 16,
    characterized in
    that on the press roller (3) one or multiple pressure segments (22) are attached, which comprise a press area (21), the area of which is matched to the area extension of the pictorial coatings, and in that transfer foil (5), seen in circumferential direction to the press roller (3), is merely fed to the transfer nip (6) in the region of circumferential portions provided with press areas (21).
20. The method according to claim 19,
    characterized in
    that the transfer foil (5) is fed to the transfer nip (6) by steps in the axial portions in which there is occupancy with press areas (21).
21. The method according to claim 16 to 20,
    characterized in
    that the print sheet in one or multiple printing units after the coating by means of the transfer foil (5) is provided with a monochrome or polychrome print image.

Images