EP1803563A2 - Method for cold film embossing - Google Patents

Abstract

An applicator unit (1) coats a printing sheet with an adhesive for image purpose. A coating module transfers an image-forming layer from a transfer film (5) onto the printing sheet. A transfer film feeding device feeds the transfer film to the coating module. A film guiding device (14) controls the advance of the transfer film such that the transport of the transfer film is stopped when the image-forming layer is not transferred onto the printing sheet in a transfer nip of a coating unit (2). An independent claim is included for method for coating printing sheet.

Description

The invention relates to a device and a method for transferring imaging layers from a carrier foil to printed sheets according to the preamble of claims 1 and 18.

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 to this problem results in a device according to the features of claim 1 and in a method according to the features of claim 18th

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 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.

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 impression cylinder, the film feed is stopped, wherein the press roll then passes in a sliding manner under the transfer film.

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

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

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

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 indicated in FIG.

As shown schematically in FIG. 1 in the applicator 1, an applicator can also be arranged in a compact design within the coating module in an integrated film application module FA. 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. For this purpose, the press roll 3 can be provided with a press fabric 10, for example as a plastic cover, comparable to a blanket or blanket, which is held in a cylinder channel on clamping devices.

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 an arc.

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, the coating module can 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, for example, a cut-out printing blanket, an imageable plastic high-pressure mold or a pressure-releasing segment 22, which can preferably be adhesively fastened or magnetically attached to a smooth base, the segmented pressing surface 21 can be used to support it. 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.

• 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.
• 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:

• 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 pressing area 21 or the area of 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.
• 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 (23)

Device for transferring image-forming layers from a carrier film to printing sheets at least with an applicator (1) for image-wise coating the printed sheets with an adhesive and with a coating module (2) for transferring the image-forming layers from the carrier film to the printing sheet in a transfer nip (6 ) between a counter-pressure cylinder (4) and a press roller (3), wherein the carrier film with the coated side in contact with the printing sheet together with this through the transfer nip (6) is feasible and while the image-forming layers are imagewise transferable to the printed sheet, and with a device for feeding the transfer film (5) to the coating unit (2) and for discharging it from the coating unit (2) with a drive for moving the transfer film in the working direction,
characterized,
that the foil feeding the transfer foil (5) is controllable by means of a device for foil guidance, that the transport of the transfer film (5) is stopped when there is in the transfer nip (6) of the coating work (2) no transfer of an imaging layer on a printing sheet. Device according to claim 2,
characterized,
in that a control in connection with a film guide of the transfer film (5) is provided such that the film feed is stopped, at least when passing through a gripper of the sheet-guiding impression cylinder (4) receiving cylinder channel (19) of the press roll (3), wherein the press roll (3 ) passes under further contact of the transfer film (5) sliding. Apparatus according to claim 1 or 2,
characterized,
in that a raised, contoured pressing surface (21) is provided as the surface of the pressing cylinder (3), wherein the pressing surface (20, 21) is limited to the maximum area to be coated. Apparatus according to claim 1 to 3,
characterized,
in that on the surface of the press roll (3) a cut-out printing blanket or a plastic high-pressure mold processed in accordance with a pressing surface (13) contoured according to the area to be coated is arranged in an appropriate manner to the surface of the printed sheet to be coated. Device according to claim 4,
characterized,
in that on the surface of the press roll (3) or on a covering (10) of the press roll (3) a press-on segment (22) contoured, stickable or otherwise, preferably detachably fastened, such as magnetically supported press-on segment (22) corresponding to the area to be coated, for forming a segmented press surface (21) is provided. Device for transferring image-forming layers from a carrier film to printing sheets at least with an applicator (1) for image-wise coating the printed sheets with an adhesive and with a coating module (2) for transferring the image-forming layers from the carrier film to the printing sheet in a transfer nip (6 ) between a counter-pressure cylinder (4) and a press roller (3), wherein the carrier film with the coated side in contact with the printing sheet together with this through the transfer nip (6) is feasible and while the image-forming layers are imagewise transferable to the printed sheet, and with a device for feeding the transfer film (5) to the coating module (2) and for discharging it from the coating module (2) with a drive for moving the transfer film in the working direction,
characterized,
in that the transfer film (5) is divided into one or more sub-film webs of lesser width and that the sub-film webs are positioned or fed side by side to the transfer nip (6). Device according to claim 6,
characterized,
in that the partial film webs are provided with mutually different imaging layers, wherein layers of different color and / or different gloss and / or different surface structure can be produced. Apparatus according to claim 6 or 7,
characterized,
in that a raised, contoured pressing surface (21) is provided as the surface of the pressing cylinder (3), wherein the pressing surface (20, 21) is limited to the maximum area to be coated. Apparatus according to claims 6 to 8,
characterized,
in that on the surface of the press roll (3) a cut-out printing blanket or a plastic high-pressure mold processed in accordance with a pressing surface (13) contoured according to the area to be coated is arranged in an appropriate manner to the surface of the printed sheet to be coated. Device according to claim 9,
characterized,
in that on the surface of the press roll (3) or on a covering (10) of the press roll (3) a press-on segment (22) contoured, stickable or otherwise, preferably releasably fastened, such as magnetically supported press-on segment (22) to form a segmented area Pressing surface (21) is provided. Apparatus according to claims 1 to 10,
characterized,
in that the press fabric (10) contains arrangements for precise fastening on the press roll (3). Apparatus according to claims 1 to 10,
characterized,
that the press fabric (10) or a carrier of the press fabric (10) having one or more register punchings. Apparatus according to claim 1 to 12,
characterized,
in that the press roll (3) contains a device for positioning the position of the press fabric (10) relative to the counterpressure cylinder (4) cooperating therewith. Device according to claim 12,
characterized,
in that the press roll (3) contains register means for positioning the position of the press fabric (10) on the press roll (3) in conjunction with the register punches. Device according to claim 14,
characterized,
in that the register device is provided in connection with clamping devices for the press fabric (10) or a support for the press fabric (10). Device according to claims 11 to 15,
characterized,
in that on the press roll (3) an automatic tensioning device for register-oriented clamping of the press fabric (10) or the support for the press fabric (10) is provided. Device according to claim 16,
characterized,
in that the automatic tensioning device for register-oriented clamping of the press fabric (10) or of the support for the press fabric (10) on the press roll (3) is brought into action in conjunction with the register device or the register punches. Process for coating printed sheets in a sheet-processing machine, in particular a sheet-fed rotary printing press using a transfer film (5) formed from imaging layers and a carrier film for transferring image-forming layers from the carrier film to the printed sheets, characterized - That at least with an applicator (1) an imagewise coating of a sheet with an adhesive takes place, and in that in a coating module (2) a transfer film (5) is used, in the image-forming layers of which image elements (21) are arranged on the carrier film such that their image side is adhesively arranged on the carrier film, in that, by means of a coating module (2), the imaging layers or image elements (21) are transferred from the carrier film to the printed sheet, wherein in the coating module (2) an impression cylinder (4) and a press roll (3) have a common transfer gap (6 ) form, - Wherein the transfer film (5) through the transfer nip (6) is feasible, such that it is placed with the coated side on the guided on the impression cylinder (4) sheet and fed under pressure together with the sheet through the transfer nip (6) . - wherein the image-forming layer (s) or image elements 821) after the exit of the printing sheet from the transfer nip (6) in the region of the adhesive provided with imagewise areas adheres to the printed sheet and is lifted from the carrier sheet, and - That the transfer film (5) in the transfer nip (6) only in the field of pictorial Coating / -en is pressed against the sheet. Method according to claim 18,
characterized,
in that one or more pressure segments (22) having a pressing surface (21), the surface of which is adapted to the areal extent of the imagewise coatings, and the transfer film (5), viewed axially relative to the pressing roller (3), are mounted on the pressing roller (3) , Only in the range of provided with pressing surfaces (21) axle sections the transfer nip (6) is supplied. Method according to claim 19,
characterized,
in that the transfer film (5) in the form of partial film webs in the axle sections is fed to the transfer nip (6) in which there is an occupancy with pressing surfaces (21). Method according to claim 18,
characterized,
in that one or more pressure segments (22) having a pressing surface (21), the surface of which is adapted to the surface area of the image-wise coatings, are applied to the press roller (3), and in that the transfer film (5) extends circumferentially to the press roller (3). seen, only in the range of provided with pressing surfaces (21) peripheral portions of the transfer nip (6) is supplied. Method according to claim 21,
characterized,
that the transfer foil (5) is gradually supplied to the transfer gap (6) in the axial sections in which an occupancy of pressing surfaces (21) is present. Method according to claims 18 to 22,
characterized,
that the printed sheet is provided in one or more printing units after the coating by means of the transfer film (5) with a single- or multi-color printed image.

Images