EP2106346B1 - Multi-color printing machine having a foil transfer device - Google Patents

Abstract

In a method for transferring layers from a carrier foil onto printed sheets, an imaging or covering layer is to be transferred from the carrier foil onto the printed sheet in an adhering manner in a sheet processing machine. A more flexible production method is provided in a sheet offset printing machine. To this end, each printed sheet is provided on at least one printed or unprinted first side with a foil coating. Each printed sheet is further turned before or after the coating in the sheet processing machine, and at least printed or coated on the side opposite of the foil coating, and provided with a film coating in a further coating device (2).

Description

The invention relates to a method and a device for transferring imaging or covering 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 a sheet-fed machine with a feeder and a boom, printing units and a coating unit are arranged. In at least one printing unit, an adhesive pattern is applied as a printed matter in the planographic printing process. In the coating unit after the printing unit, a counter-pressure cylinder, a pressure roller and a film guide are provided. Therein, a foil strip is guided through the transfer nip of the coating unit between impression cylinder and press roll from a film supply roll and wound up again on the exit side after leaving the coating unit. The transfer film contains a carrier film on which functional layers of various types, such as metallic layers, for example of aluminum, or plastic layers can be applied. Between functional layer and carrier film, a separating layer is provided, by means of which the functional layer can be removed from the carrier layer.

After a printing sheet is provided with a two-dimensional adhesive application or an adhesive pattern, it is passed through the coating unit, wherein by means of the pressure roller, the pressure sheet resting on the impression cylinder is brought into contact with the film material. The down-facing functional layer engages tightly with the adhesive-provided areas on the signature. Thereafter, the functional layer adheres only in the area provided with adhesive pattern or even full-surface adhesive areas on, wherein the carrier film, the functional layer is removed in the region of the adhesive pattern. The print sheet is laid out in the coated state.

A disadvantage of the described procedures is that they are not flexible to use, require extensive know-how on the complex processes and are difficult to handle.

From the WO 2005/100024 A1 is a printing machine with embossing known. In a coating module here, a film layer can be transferred to a sheet. The coating module is part of a film transfer module, which can be arranged at various locations in a sheet-fed press. In this case, the sheet-fed printing press may also include a turning device for everting printed sheets. It can be provided that printed on one side of the sheet, the sheet is then turned and then coated by means of a film transfer module with a wear layer of a transfer film.

Furthermore, from the EP 1 700 692 A2 a production method for an embossing device in a sheet-fed printing machine and apparatus for its implementation known. The production of printed sheets in a coating module for the transfer of imaging layers from a transfer film to a substrate should be made more flexible. For this purpose, various processing devices are connected to the coating module in a sheet-processing machine. In this case, a pre-coating of the transfer film may also be provided, so that the pre-coating is transferred to the print sheet simultaneously with the wear layer during film transfer.

The object of the invention is therefore to provide a method according to the preamble of claim 1, by means of which a flexible coating of printed sheets can be simple, safe, economical and accurate, with the method and device should be easy to handle.

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

Advantageously, a method is proposed in the application for coating or multiple coating of one or both sides to be printed sheet used a sheet-fed rotary printing press and the coating is carried out in the cold foil stamping process.

It can be advantageously by the combination of coating units such. As paint modules, a device for perfecting and coating modules for a one- or two-sided film application are possible.

As procedures are provided

1. 1. A one- or two-sided coating of a printing substrate by a film application by means of a cold foil transfer process is used for the production of any printed products.
2. 2. In inline printing or coating, by means of a sheet-fed rotary printing press and a cold foil embossing application for the production of composite packaging with one or more coating modules within a printing press, the processing of foil, paper with aluminum-evaporated lamination or aluminum-coated papers or the application of another Foil layer are made.
3. 3. In combination of process steps for inline printing, inline coating and inline coating is within a single sheet-fed rotary printing press with coating modules and one or more cold foil stamping devices, the production of printed products by processing film or paper of different qualities, the application of a further film layer even after a pre-coating possible. Also with this product properties, optically or tactile effective pre-coating and application of a decorative film can be combined.
4. 4. In the cold foil embossing application, an integration of the cold foil embossing process for general application for double-sided printing or coating may possibly be suitable due to the combination of printing, sheet application, film application opposite side, if necessary printing and painting.
5. 5. The processing of aluminum-laminated substrates is another possible solution, with a cold foil embossing application can be made possible in a sheet-fed or flexographic printing machine.
6. 6. The device includes a coating module for the cold foil transfer process before and / or after a turning device within a sheet-fed press and complements the described process engineering in an advantageous manner.

1. A) Schöndruck, d.h. einseitiger Druck bzw. Beschichtung, mit nachfolgender Folienapplikation, darauf folgend ein oder mehrere Farbdrucke, ein Lacküberzug und eine Inline-Weiterverarbeitung durch Stanzen, Prägen, Rillen, Perforieren o. ä.
2. B) Schön- und Widerdruck, d.h. beidseitiger Druck bzw. Beschichtung, mit nachfolgender Folienapplikation, darauf jeweils folgend ein oder mehrere Farbdrucke, ein Lacküberzug und schließlich noch eine Inline-Weiterverarbeitung durch Stanzen, Prägen, Rillen, Perforieren o. ä. oder auch ein reiner Druckbetrieb ohne Folienapplikation.
3. C) Schöndruck, d.h. einseitiger Druck bzw. Beschichtung, mit nachfolgender Folienapplikation.
4. D) Schöndruck ohne Folienapplikation.
5. E) Einsatz des Kaltfolientransfermoduls mit einer entsprechend gestalteten Hochdruckform zur gleichzeitigen Durchführung eines Weiterverarbeitungsvorgangs wie Stanzen, Prägen, o. ä.
6. F) Anordnung der Wendeeinrichtung für den Schön- und Widerdruck an beliebiger Position in der Druckmaschine
7. G) Anordnung eines Nummerierwerkes in Verbindung mit dem Folientransfermodul

In a perfecting press, which has additional units for painting, stamping, embossing or other types of further processing, so different operations can be performed:

1. A) Perfecting, ie one-sided printing or coating, with subsequent application of film, following one or more color prints, a lacquer coating and an inline finishing by punching, embossing, grooves, perforation o. Ä.
2. B) perfecting, ie double-sided printing or coating, with subsequent application of film, then each one or more color prints, a lacquer coating and finally an inline finishing by punching, embossing, grooves, perforation or the like pure printing operation without foil application.
3. C) Perfecting, ie one-sided printing or coating, with subsequent film application.
4. D) Perfecting without foil application.
5. E) Use of the cold foil transfer module with a correspondingly designed high-pressure mold for simultaneously carrying out a further processing operation such as stamping, embossing, or the like.
6. F) Arrangement of the turning device for the perfecting at any position in the printing press
7. G) Arrangement of a numbering unit in conjunction with the film transfer module

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

Figur 1

eine Darstellung einer Bogenrotationsdruckmaschine mit einer Fo- lientransfermodul und

Figur 2 bis 5

Konfigurationen einer Bogendruckmaschine mit einem Folien- transfermodul.

Showing:

FIG. 1

a representation of a sheet-fed rotary printing machine with a Filientransfermodul and

FIGS. 2 to 5

Configurations of a sheet-fed press with a film transfer module.

In FIG. 1 is a sheet-processing machine, here a printing press, shown, which consists of at least two printing units.
A sheet to be coated is provided in a first step in the applicator 1 with an imaging adhesive pattern. For this purpose, a printing unit of an offset printing press with inking and dampening units 11, a printing plate on a plate cylinder 12, a blanket or blanket cylinder 13 and a counter-pressure cylinder 4 can be used. Likewise, applicators can be used in the form of flexographic printing or painting units. The adhesive can also be applied in two applicators 1, to improve its effect on different substrates.
In the second step, a transfer film 5 is guided under pressure through a transfer nip 6 together with the printing sheet. A film transfer module 2 used for this purpose may be a printing unit, a paint module, a base unit or another type of processing station of a sheet-fed offset printing press.
The transfer nip 6 in the film transfer module 2 is formed by a transfer cylinder 3 and an impression cylinder 4. The transfer cylinder 3 may correspond to a blanket or form cylinder of a known offset printing unit or paint module of a sheetfed offset printing press. Within the film transfer module 2, a web guide for transfer films 5 is shown.

A film supply roll 8 is assigned to the film transfer module 2 on the page of sheet feeding. 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 film transfer 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 guided flat without distortions and held in the same voltage with respect to the transfer cylinder 3.

The transfer film 5 can be guided around the transfer cylinder 3, wherein the transfer film 5 advantageously only from one side of the film transfer module 2 from the press nip 6 and can be discharged (see dashed line illustration). In a further embodiment, the transfer film 5 can also be fed in and out substantially tangentially on the transfer cylinder 3 or wrap it around only in a small circumferential angle to the press nip 6. For this purpose, the transfer film 5 is supplied from one side of the film transfer module 2 and discharged to the opposite side of the film transfer module 2. On the outlet side of the printing unit, a film collection roller 9 is shown, by means of which used sheet material is wound up. Again, a rotary drive 7 is provided, which is controllable.

Furthermore, it is provided in the area of the adhesive application and the film transfer dryer 16 provided. Thus, e.g. by UV drying, the adhesive layer by means of a first dryer 16 (intermediate dryer I) are pre-dried, so that the wear layer of the transfer film 5 better adheres. 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 final drying of the adhesive.

For the transfer process of imaging e.g. Wear layer of the transfer sheet 5 on the printing sheet in the transfer nip 6 between the transfer cylinder 3 and the impression cylinder 4, the surface of the transfer cylinder 3 is provided with compressible, damping elements as press fabric 10.

As in Fig. 1 the cold foil application can also be embodied in an integrated film transfer module FA. Here, the film feeder is additionally integrated into the same printing unit, here the applicator 1, so that adhesive application and film transfer take place in two successive work columns on the same impression cylinder 4.
For this purpose, an additional application unit 1 'may be arranged upstream of the blanket cylinder 13 on the first impression cylinder 4. Then, the blanket cylinder 13 acts as a press roller and the film web 5 'is guided by this through the transfer nip.

Alternatively, an additional press roller 3 'may be arranged downstream of the blanket cylinder 13 on the impression cylinder 4. The rubber cylinder 13 then applies the adhesive as usual and an additional transfer nip 6 'is formed by the press roll 3', through which the transfer film 5 'is guided for transferring the film coating against the printing material. Here, a cleaning device R 'may additionally be arranged in order to remove impurities (glitter) of the transfer film 5'.

With the described device, it is already possible to imagewise coat a printing material on one side or to seal it over its entire surface. For this purpose, the device for the film transfer in a printing units of a sheet-fed printing machine downstream printing or coating plant is arranged. With such an arrangement, furthermore, the surface of the fresh print can be protected.
For other applications, within the sheet-fed rotary printing press of the first device for the film transfer, a second such device can be arranged downstream, so that a double lamination of a sheet is possible.
Furthermore, a configuration can be provided which provides a first film transfer module in front of the first color or coating transfer printing unit and a second film transfer module after the last color transferring printing unit. Thus, a first coating can be applied directly to the substrate and a second coating can be applied over the printed image.

Using a device described above for carrying out the cold foil stamping method, it is also possible to carry out processes in the use of which it is possible to coat or even coat multiple print products to be coated on one or both sides within a sheet-fed rotary printing press.

It can be advantageously by the combination of coating units such. As paint modules, a device for sheet turning and coating modules for a single or double-sided film application. By means of the methods and devices according to the invention, the production of effect and functional application can also be made possible in connection with a printability of the printing material on both sides.

In FIGS. 2 and 3 For this machine configurations are shown schematically, which allow example corresponding operations.

In the FIGS. 2 and 3 D printing units are provided for processing viscous printing inks. Instead of the printing units D can also be optionally used paint modules for processing liquid coatings or coating media. Printing units D can also be used to apply a coating of liquid coating media.

In FIG. 2 a first variant of such a configuration is shown. The illustrated printing machine has after two to the sheet feeder AN subsequent printing units D or paint modules or a combination of printing units and paint modules to a so-called turning device W. Turning devices W serve to invert a single-sided printed or coated printed sheet during sheet-fed operation of a sheet-fed printing press, so that its previous underside becomes the upper side, which can subsequently be printed or coated.

In the configuration shown, the applicator 1 and a coating module 2 adjoin the turning device W, which can also be arranged as an integrated film transfer module FA within a printing unit. Thereafter, if necessary, several further printing units D are provided up to the sheet delivery AU.

With such a printing press, each printed sheet can be printed on one or two colors of its back side or printed and coated, then turned, then coated with a laminating or imagewise executed film layer and subsequently printed again in multiple colors.

In FIG. 3 a second variant of such a configuration is shown. The printing press shown is then provided with a one- or two-part film transfer module 1, 2, followed by one or more printing units D and subsequently a so-called reversing device W is provided, which serves to a one-sided sheet-coated printing sheet evert so that its previous bottom can be subsequently printed or coated.
In the configuration shown, several further printing units D are provided following the turning device W to the sheet delivery AU if necessary.

In FIGS. 4 and 5 configurations are shown for sheet-fed rotary printing presses with eight printing units D, 1, 2 and two turning devices W. Here, two printing units D, 1, 2 are provided in each case to the sheet feeder AN, then followed by a turning device W, then following again two printing units D, 1, 2 and close to 4 printing units D to the sheet delivery AU.

In principle, the two first printing units can be used for the cold foil transfer, so that in the first turning device W after the second printing unit D everted the sheet and then printed back six-color or multicolor printed and otherwise processed.

In FIG. 4 Here, the second printing unit is designed as a commissioning unit 1 and the third printing unit as a coating module 2. Here, in the first printing unit D, which may also be formed as a paint module, a pre-coating, a first printed image or an embossing o. Ä. Further processing can be performed. After the cold foil transfer by means of applicator 1 and coating module 2, a further coating, overprinting or processing can be provided, so that after a turn in the second turning device W, the printed sheet can then be printed four-color from its back.

In FIG. 5 In this case, the third printing unit is designed as an application unit 1 and the fourth printing unit as a coating module 2. These are here as integrated cold foil transfer module FA shown. Here, in the first two printing units D, which can optionally be designed as a paint module, a pre-coating, a first two-color print image or in combination embossing o. Ä. Further processing are performed. After the cold foil transfer by means of applicator 1 and coating module 2, a turn of the sheet in the second turning device W take place, whereupon the sheet can then be printed in four colors from its back or printed multi-colored and otherwise coated or processed.

With such a printing press, each printed sheet can be printed on its back one or two colors, then turned, then coated with a laminating layer and subsequently printed again in multiple colors.

Furthermore, in such machines further production possibilities arise by providing printed sheets with optical or tactile patterns, which are underlaid and visible or palpable by the film coating, or also by applying optical or tactile surface patterns over the film itself. These coating operations can again be done on one side or both sides on unprinted or printed surfaces.

To improve the function, it is provided that at least the counter-pressure cylinder 4, which is arranged in a printing unit D downstream of a turning device W, is provided with a special counterpressure surface. In this case, the already coated side of the sheet coincides with the cylinder surface and so-called greasing effects can occur.
To counter this, the surface of the impression cylinder 4 may be provided with a finishing coating, so that an acceptance of coating materials is prevented by the press sheet. The coating may also have a structuring for this purpose. Likewise, finishing coating and structuring can be combined.

As an alternative to the direct arrangement on the surface of the impression cylinder 4, it is also possible to provide a so-called counterpressure plate which carries the finishing and / or structured coating. The back pressure plate is then removably disposed on the impression cylinder 4.

Of course, several or all counter-pressure cylinders 4 in the printing units D, which are arranged after a turning device W, be provided with such a coating or pressure plate.

In this case, a double-sided film application in inline and / or offline operation is to be made possible in order to improve the properties of the printed products, with a cold foil embossing application in a sheet-fed or flexographic printing machine can be made possible.

The device includes a coating module for the cold foil transfer method before and / or after a turning device within a sheet-fed printing machine and complements the described process engineering in an advantageous manner.

LIST OF REFERENCE NUMBERS

1

commissioned

2

coating plant

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

rubber cylinder

14

guide

15

Printing plant security

16

dryer

17

inspection device

18

dancer roll

1'

commissioned

3 '

press roll

5 '

Transfer foil / foil web

6 '

transfer nip

R '

cleaning device

D

printing unit

AT

investor

AU

boom

FA

Foil transfer module

W

turning device

Claims (7)

1. A method for the transfer of imaging or covering layers of a substrate foil on print sheets in a sheet-processing machine, more preferably a sheet-processing rotary printing press, at least with an application system (1) for imaging or areal coating of a print sheet with an adhesive and with at least one coating system (2) for the transferring of imaging or covering layers from the substrate foil onto the printing sheet, wherein in a coating system (2) a transfer gap (6) is formed and the substrate foil along the surface of a pressure roller (3) and with the coated side is placed on to a printing sheet and under pressure can be jointly with the latter guided through the transfer gap (6) so that the imaging and covering layers are adhesively transferred from the substrate foil to the printing sheet in regions provided with adhesive, that each printing sheet on at least one printed or coated or unprinted or uncoated first page in a transfer gap (6) is provided with a foil coating from the substrate foil (5), that each printing sheet before or after the coating is reversed in the sheet-processing machine and that each printing sheet is at least printed and/or coated on the side opposite to the foil coating and/or in a further coating system (2) is provided with a foil coating, characterized in that the printing sheet on a side to be coated with a foil coating from a substrate foil (5) in a transfer gap (6) is provided with a pre-coating comprising a visible or tactual pattern, wherein the adhesive application is performed subject to the inclusion of the areal components of the pre-coating and that the pre-coating is performed in a printing system or varnish module or by means of inkjet printing heads, wherein the printing sheet on a side to be coated from a foil coating from a substrate foil (5) in a transfer gap (6) are provided with a visually or tactually effective pre-coating, wherein the pre-coating is carried out on to the imaging side of the substrate foil (5) in such a manner that the pre-coating together with the imaging layer of the substrate foil (5) is transferred on to the printing sheets in the transfer gap (6).
2. The method according to Claim 1, characterized in that printing sheets are at least printed on a first side, in that the printing sheets are reversed in the sheet processing machine and in that the printing sheets are provided with a foil coating from a substrate foil (5) on the side located opposite the printed side in a transfer gap (6).
3. The method according to Claim 1, characterized in that printing sheets on a first side are provided with a foil coating from the substrate foil (5) in a transfer gap (6), in that the printing sheets are reversed in the sheet-processing machine and in that the printing sheets are at least printed on the side located opposite the foil coating.
4. The method according to Claim 1, characterized in that printing sheets on a first side are provided with a foil coating from the substrate foil (5) in a transfer gap (6), in that the printing sheets are reversed in the sheet-processing machine and in that the printing sheets are provided with a further foil coating in a further transfer gap (6) on the site located opposite the foil coating.
5. The method according to Claim 4, characterized in that printing sheets on a first unprinted and coated or printed and coated side are provided with a foil coating in a transfer gap (6), in that the printing sheets are reversed in the sheet-processing machine and in that the printing sheets are provided with an additional foil coating at least in a further transfer gap (6) on the unprinted and coated or printed and coated side located opposite the foil coating.
6. The method according to Claim 1, characterized in that printing sheets on a first side are provided with a foil coating from the substrate foil (5) in a transfer gap (6) on to which a coating or a printing image is optionally applied, in that the printing sheets are reversed in the sheet-processing machine and in that the printing sheets on the side located opposite the foil coating are provided with a further foil coating in a further transfer gap (6) onto which foil coating a coating or a printing image is optionally applied.
7. The method according to Claim 6, characterized in that printing sheets on a first unprinted and coated or printed and coated side are provided with a foil coating from the substrate foil (5) in a transfer gap, in that the printing sheets are reversed in the sheet-processing machine and in that the printing sheets on the unprinted and coated or printed and coated side located opposite the foil coating are provided with a further foil coating at least in a further transfer gap (6).

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