EP1737659B1 - Pad for embossing device - Google Patents

Abstract

For transferring an image-forming layer from a transfer foil a printing sheet, an adhesive layer is first applied to the sheet to be printed. The transfer foil provided with the image-forming layer is guided past the printing sheet under pressure, in a coating module (2), such that the image-forming layer adheres to the adhesive and an image is created. The present invention provides a foil transfer device that includes a substrate on the press cylinder that has a reduced adhesiveness relative to the transfer foil.

Description

The invention relates to a device for transferring imaging layers from a carrier film to printing 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. 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 are not flexible and that the consumption of transfer film is expensive.

From the US 5,565,054 A For this purpose, a film printing method and a film printing device is known. The film printing device has a press nip, which is formed by a pressure roller and a counter-pressure roller. A film web is guided in the press nip of the pressure roller with an elastic and flat surface.

Furthermore, from the US 2003/0015111 A1 a fabric for printing machines known to avoid the smearing of ink. The fabric is arranged on sheet transport drums of a sheet-fed press whose surface comes into contact with the freshly printed side of printed sheets. The surface of the fabric is structured, can have glass-spherical structures and can be treated antistatic or ink-repellent.

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 can be done safely, economically and accurately, the device should be easy to handle.

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

Advantageously, a timing method is used to guide the transfer sheet, wherein the transfer sheet is separated during a clocking step by pneumatic means from the press roll.

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.
In a further embodiment, the surface of the press roll may be provided with an elevated pressing surface contoured in outline, which is limited to the area to be coated. This is a cut blanket, a plastic printing form or a stickable Andrucksegment suitable. Thereby, the feed of the transfer film can be stopped in a very advantageous manner, even if the area to be coated is within the image area of the sheet.
A further improvement of the film utilization results from the fact that the transfer film is divided into one or more Teilfolienbahnen smaller width. In combination with the above-mentioned method, it is thus also possible to use different types of film side by side.

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

Figur 1

eine grundsätzliche Darstellung einer Druckmaschine mit einer Folientransfereinrichtung,

Figur 2

den Aufbau einer Presswalze in einer Folientransfereinrichtung und

Figur 3

den Aufbau einer Pressbespannung.

Showing:

FIG. 1

a basic representation of a printing press with a film transfer device,

FIG. 2

the construction of a press roll in a film transfer device and

FIG. 3

the structure of a press fabric.

• 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. Gleichfalls sind hier Auftragwerke in Form von Flexodruckeinheiten oder Lakkierwerken einsetzbar.
• 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 Druckbogens unter erhöhtem Druck überwalzt werden soll.

In FIG. 1 is a sheet-processing machine, here a printing press, shown, 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 machine 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. Likewise are here commissioned works in the form of flexographic printing units or lacquering plants used.
• 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 form cylinder and the impression cylinder 4 correspond to a counter-pressure cylinder of a paint module of a sheet-fed press.
• Furthermore, downstream of the coating module 2, a so-called calendering unit can be provided if the coated printing sheet is to be rolled under increased pressure to increase the adhesion of the coating 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 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 advantageously be fed and discharged from the press nip 6 only from one side of the coating module 2 (see dashed representation). The film web may differ from the illustration to Fig. 1 and depending on the space conditions on the one side of the coating module 2 advantageously in the feeding strand and the laxative strand are guided closely parallel to each other.
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 on the inlet side by means of a Brake be held tight. A film control is possible in this context with dancer roller 18 mentioned later.

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 or less than in conventional blankets or blankets, which can also be used at this point.
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.

• Hierzu kann eine Steuerung der Transferfolie 5 derart erfolgen, dass beim Durchlaufen eines Greifer des bogenführenden Gegendruckzylinders 4 aufnehmenden Zylinderkanales der Folienvorschub angehalten wird. Die Greifer halten den Druckbogen auf dem Gegendruckzylinder 4. Die Presswalze 3 weist einen dazu korrespondierenden Zylinderkanal 19 (siehe Fig. 3) auf, in dem eine Pressbespannung 10 gehaltert ist. Im Bereich der korrespondierenden Zylinderkanäle erfolgt keine Pressung der Transferfolie 5 zwischen der Presswalze 3 (Drucktuchzylinder) und dem Gegendruckzylinder 4. Die Presswalze 3 läuft dann an der Transferfolie 5 gleitend weiter, während die Transferfolie 5 zwischen Presswalze 3 und Gegendruckzylinder 4 frei liegend gespannt ist. Dieser Zustand dauert an bis am so genannten Druckanfang der Zylinderkanal 19 endet und die Transferfolie 5 erneut zwischen der Presswalze 3 und dem Gegendruckzylinder 4 unter Einschluss eines Druckbogens eingeklemmt wird. Dann wird die Transferfolie 5 weiter transportiert. Die Taktung des Folienvorschubes kann entsprechend einer notwendigen Beschleunigung bzw. Bremsung der Folienvorratsrolle 8 bzw. Foliensammelrolle 9 etwas früher beginnen bzw. aussetzen als dies die Kanalkanten des Zylinderkanals vorgeben. Bei reaktionsschnellen Taktungssystemen über so genannte Tänzerwalzen 18, wie sie beispielhaft in Figur 1 eingezeichnet sind, ist die Steuerung der Drehantriebe 7 der Folienvorratsrollen 8 bzw. Foliensammelrolle 9 ggf. nicht erforderlich. Mittels der Tänzerwalzen 18 wird ebenfalls die notwendige Folienspannung aufrecht erhalten.

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 to the film collection roll 9 is controllable such that as far as possible, the transfer sheet 5 is then stopped, if 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 sheet on the impression cylinder 4. The press roll 3 has a corresponding cylinder channel 19 (see Fig. 3 ), in which a press fabric 10 is held. In the region of the corresponding cylinder channels, there is no pressing of the transfer film 5 between the press roll 3 (blanket cylinder) and the impression cylinder 4. The press roll 3 then continues to slide on the transfer film 5, while the transfer film 5 is stretched freely between the press roll 3 and impression cylinder 4. This state continues until at the so-called pressure start of the cylinder channel 19 ends and the transfer sheet 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 exemplified in FIG. 1 are shown, the control of the rotary actuators 7 of the film supply rolls 8 and 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 an arc. 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 not to be coated Each section of film web can be shut down independently of the other sub-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.

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-releasing segment 22, which may preferably be adhesively fastened or may be adhesively attached or magnetically attached, may be used to support the segmented pressing surface 21. A pressure pad 22 provided with a magnetic adhesive surface on its underside may e.g. be placed directly on the surface of the press roller 3. On the other hand, a magnetic film can be clamped onto the surface of the press roller 3, to which then a contact pressure segment 22 with a magnetically adhering rear side can be placed for attaching or positioning the segmented press surface 21. The surface and the internal structure of the Andrucksegmentes 22 should correspond to the information described above with respect to elasticity and smoothness. Here, a compressible blanket 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.

However, the associated device fundamentally includes a corresponding feed control for the transfer film 5, which ensures that at least the film piece lying between the press roller 3 and the impression cylinder 4 is stationary as long as the cylinder channel 19 passes through.

In order to improve the coating process, it is provided to bring the film to a standstill in areas where no stripping takes place, such that the press roll 3 passes empty under the transfer film 5. This can be done, for example, when the so-called cylinder channel 19 passes through or when using a segmented pressing surface 21 passes through a non-pressing area. To shut down the transfer film 5, it is necessary the Transfer film 5 opposite to the surface of the blanket cylinder or the press roller 3 to solve or equip the surface of the press roller 3 antiadhesive ..

In an appropriate device for this purpose, an arrangement of blowing devices can be provided in the region of the press roll 3. When the film web is stopped, a thin layer of air can be formed under the film web on the press roll 3 by means of a blast of compressed air in the gap of the inlet or outlet of the film web. This allows the press roll to continue while the film web is stationary. For this purpose, in turn, the aforementioned dancer rollers 18 in function, which compensate for the film run.

In the FIGS. 2 and 3 is a section through a press roll 3 or by the press fabric 10 and the reference on the surface of the press roll 3 shown. The press roll 3 is provided with a press fabric 10, for example as a plastic coating, comparable to a blanket or blanket. The press fabric 10 is held in a cylinder channel 19 at clamping devices.
The press fabric 10 is 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 or less than in conventional blankets or blankets, which can also be used at this point.

A different kind of 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. Preferably, a press fabric 10 is made of a blanket having a relatively thin, hard surface, which consists of a plastic coating as a functional layer 24. This functional layer 24 is provided with a compressible substructure consisting of a compact elastic material or of closed-cell or open-cell foam. Only below should the force-transmitting layer, for example a fabric layer, be arranged. Thus, with high flexibility of the surface is nevertheless a very high strength of the blanket or press fabric 10 achieved. This has the particular advantage that the adaptation of the transfer film 5 to the respective substrate surface or the applied adhesive succeeds particularly well.

It should be added that the surface of the press fabric 10, for example, the plastic coating 14, should be very smooth. The plastic coating 14 has a low surface roughness with a surface roughness in the range of 1 micron or smaller.
The material of the press fabric 10 further preferably has the lowest possible adhesion to the material of the carrier film of the transfer film 5.

Although the surfaces of blankets are very smooth, they are still ink-receptive and in this way, for example, the transfer film adheres to rubber blankets conventional style rather. This leads to damage when transferring the imaging layer to the printed sheet.

By means of the plastic surface of the press fabric 10, which has a low adhesion to the transfer sheet 5, a clean transfer of the imaging layer is made possible on the sheet, since the transfer sheet 5 fixed by the press fabric 10 per se only against the sheet and by means of adhesion to the Gluing is performed on the sheet. Then the synchronization of the film web is tuned, so that no shifts in the splice can occur.

By a, as described, elastic construction of the press fabric 10, a very flexible transfer nip 6 is generated. Furthermore, an enlargement of the transfer nip 6 in the direction of a relatively flat extension is generated by a diameter, for example, of the impression cylinder 2 that is twice the diameter of the press roller 3. In this case, to produce an optimum transfer pressure in the transfer nip 6, a slightly higher pressure provision can be selected between the press roller 3 and the impression cylinder 4 than is necessary in a conventional printing process. For example, you can Additional values of 0.10 mm to 0.14 mm are used in comparison to a standard value of 0.1 mm.

On the other hand, with a smaller compressibility of the press fabric 10, a narrower and thus also a smaller transfer surface with a higher surface pressure is achieved. In this way, the optimum transfer pressure in the transfer nip 6 can be achieved by means of a normal or even slightly greater pressure provision between the press roller 3 and the impression cylinder 4.

Through all these measures, on the one hand, a wide pressure surface in the transfer nip 6 and, on the other hand, a secure mobility between the surface of the press roll 3 pressing the transfer film 5 and the press fabric 10 and the reverse side of the transfer film 5 resting on the impression cylinder 4 or the printed sheet are made possible , With these means, the transfer of even the finest patterns from the imaging layer to the printing sheet is ensured.

In a variant of the device can be moved differently. If the film transport takes place around the press roll 3, adhesion of the film web 5 to the press roll 3 results. This can be the case with the use of an offset printing unit described above. The adhesion could cause the film web 5 to tear. Therefore, the surface of the press roller 3 is to be provided with a special surface. For this purpose, a friction or adhesive blanket can be provided. Instead of a normal blanket but also a so-called Perldrucktuch can be used to minimize the friction between the surface of the press roll 3 and the film web 5. Perlage blankets are already known for other applications and have on their surface very fine glass balls to reduce the contact surface with the adjacent element. On the one hand the contact rubbing on the other hand, a static charge is avoided. With a Perldrucktuch can be worked for certain film qualities even when wrapping the press roll 3 without Blasluftunterstützung.

Depending on the doping of the Perltuchoberfläche in which many small glass spheres correspond to a more or less smooth surface and a few larger glass spheres correspond to a structured surface, on the one hand, a transfer of fine patterns can be guaranteed or even desired structural effects on the surface of the film coating can be generated.

On the basis of the present embodiments, it is possible to transfer different types of coatings in the transfer process from a transfer film 5 to different substrate materials.

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

Color / Feuchwerk

12

plate cylinder

13

Blanket cylinder

14

guide

15

Verschutzung

16

UV dryer

17

monitoring system

18

dancer roll

19

cylinder gap

20

Press area

21

segmented pressing surface

22

Andrucksegment

23

Blanket support

24

functional position

Claims (11)

1. A device for the transfer of imaging layers from a substrate foil on to print sheets at least with a transfer foil (5) formed of the substrate foil and the imaging layers with an application system (1) for image-based coating of a print sheet with an adhesive and with a coating module (2) for transferring the imaging layers from the transfer foil on to the print sheet, wherein the coating module (2) includes an impression cylinder (4) and a press roll (3) forming a common transfer gap (6), and wherein in addition the substrate foil can be guided round about the press roll (3) or approximately tangentially passed the press roll (3) in such a manner that with the coated side it is placed on to the print sheet guided on the impression cylinder (4) and under pressure jointly with the print sheet is jointly guided through the transfer gap (6) between press roll (3) and impression cylinder (4) and wherein the imaging layers following the exit of the print sheet from the transfer gap (6) in the region of the image-based regions provided with adhesive, adheres to the print sheet and is lifted off the substrate foil, characterized in that the press roll (3) is provided with a transfer foil (5) formed of the substrate foil and the imaging layers, which has a very fine texture and/or comprises a material for reducing or eliminating the adhesion of the surface of the cover (10) relative to the substrate foil.
2. The device according to Claim 1, characterized in that the cover (10) comprises a surface with elevations of spherical surface-like texture.
3. The device according to Claim 2, characterized in that the cover (10) comprises a surface of a multiplicity of densely packed small glass balls substantially located at the same height.
4. The device according to Claim 4, characterized in that a control is provided in conjunction with the rotary drive (7) of the transfer foil (5) or in the foil guide in such a manner that upon the passage of a cylinder channel (11) accommodating grippers of the sheet-guiding impression cylinder (4) the foil feed is stopped while the press roll (3) subject to continued contact with the transfer foil (5) passes through in a sliding manner.
5. The device according to Claim 4, characterized in that as surface of the press roll (3) an elevated press area (21) contoured in outline is provided, wherein the press area (21) is limited to the maximum region to be coated.
6. The device according to any one or a plurality of the preceding claims, characterized in that the cover is a press clothing (10) having a surface with a basic texture of a multiplicity of densely packed small glass bowls substantially located at the same height and which are evenly or unevenly distributed within the basic texture of additional surface elements deviating in height from the basic texture.
7. The device according to Claim 13, characterized in that the surface of the deviating additional surface elements in the surface of the press clothing (10) has the texture of the elements in the basic texture or a texture which is of the same type or not of the same type deviating from said basic texture.
8. The device according to Claim 1, characterized in that the press roll (3) is provided with a smooth cover (10) of low compressibility and that the surface of the cover (10) at least in the region of the contact with the transfer foil (5) has minimal adhesion relative to the substrate foil.
9. The device according to Claim 1 to 8, characterized in that the cover (10) consists of a function layer with a material of low surface tension, wherein its surface is smoothed and the cover has a compressible substructure (23).
10. The device according to Claim 1 to 9, characterized in that the cover (10) as surface element fully covering the entire cylindrical surface region of the press roll of the coating system (2) is detachably mountable on to the press roll (3).
11. The device according to Claim 1 to 9, characterized in that the cover (10) as a surface element covering a part area of the cylindrical surface region of the press roll (3) of the coating module (2) can be detachably positionably attached to the press roll (3) or a clothing carried by the press roll (3).

Images