EP2004409A1

EP2004409A1 - Printing press having an embossing device

Info

Publication number: EP2004409A1
Application number: EP07723350A
Authority: EP
Inventors: Jürgen Schölzig
Original assignee: Manroland AG
Current assignee: Manroland AG
Priority date: 2006-04-01
Filing date: 2007-03-17
Publication date: 2008-12-24
Also published as: DE102006015249A1; JP2009532225A; WO2007115641A1; CN101415557A

Abstract

The possible applications of the film supply in a coating module for transferring image-providing layers from a transfer film onto a printing material are to be widened. For this purpose, the film supply is assigned a coating device for applying layers or information or useful elements on the transfer film. The additional layers are transferred onto the printing material in the coating module together with the use layer of the transfer film. Here, the transfer film is preferably guided approximately tangentially past a press roll.

Description

Printing machine with embossing device

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. Thus, EP 0 569 520 B1 describes a printing material and a printing device using this material. In this case, a sheet-processing machine is shown, which has a feeder and a boom, wherein printing units and a Beschichtungsmo- 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 transporting sheets through the printing unit, each sheet is provided with an adhesive pattern. Thereafter, the sheet is passed through the confining module, wherein by means of the press roller, the pressure sheet resting on the counter-pressure cylinder is brought into contact with the sheet material. In this case, the downwardly lying metallic layer enters into a close connection with the areas provided with adhesive on the printed sheet. After further transporting the printing sheet, the metallic layer adheres only in the area provided with the adhesive pattern. The carrier film is thus removed from the metallic layer in the region of the adhesive pattern. The used in this way transfer film is wound up again. The print sheet is laid out in the coated state.

It is known to use such coating modules, for example in printing units of printing presses. A disadvantage of the known devices is that they can not be used flexibly.

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.

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

According to the invention, a printing press becomes more flexible in its application in that a film transfer module is integrated. The film transfer module can be implemented as part of a print engine, as a separate workstation, as an integrated workstation, or as a workstation that can be moved. The application is carried out in conjunction with various printing processes.

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

Therefore, it is also advantageously possible to provide a plurality of coating modules within a sheet-processing machine in a row.

Thus, the application of various imaging coatings or

Metallization layers within a subject take place successively. In this case, it is possible to transmit the imaging layers next to one another using a single adhesive pattern with all the 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. hen and superimposed in the following another, apply the first enclosing adhesive pattern and provided with a different imaging coating or metallization.

Furthermore, the film transfer module in a sheet-fed printing machine can also be arranged downstream of a device for the use of a sheet, so that an image-wise coating of the film transfer takes place on a sheet backside after previous front side printing

To improve the coating properties, the imaging layer can be applied by means of so-called UV negative pressure ink, by means of a

Printing unit for the adhesive in e.g. is applied over an offset printing plate.

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

Showing:

Figure 1 is a basic illustration of a printing machine with a film transfer device and

Figure 2 shows the structure of a coating module with a film transfer device and

Figures 3 to 6 configurations for the integration of film transfer modules in a printing press.

FIG. 1 shows a sheet-processing machine, here a printing press, which consists of at least two printing units.

A printing sheet to be coated is provided with an image-forming adhesive pattern in an applicator 1. The application of the adhesive takes place in offset printing by means of dyeing and dampening units 11, a printing plate on a plate cylinder 12, a blanket or blanket cylinder 13 and a counter-pressure cylinder 4. Likewise here are applicators in the form of flexographic printing or painting used. A variant of such an embodiment is shown in Fig. 4. The adhesive is transferred there by means of a dosing system 21 via an anilox roller 22 and a transfer roller 23 to a forme cylinder 24. This carries in this case a high pressure plate for generating the imaging adhesive application.

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 against the printing sheet in the transfer nip 6, thereby transferring an image-forming layer to the printing sheet in the region of the adhesive image. The transfer nip 6 in the laminating module 2 is formed by a press roll 3 and an impression cylinder 4.

Within the coating module 2 used for the film transfer, a web guide for transfer films 5 is shown. A film supply roll 8 is assigned to the coating module 2 on the side of the sheet feed. 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, guide devices 14 are provided in the region of the film feed and removal, so that the transfer film 5 can be guided without distortions and held in the same tension against the press roller 3. In this way, the film feed in the area of the coating unit 2 surrounding Verschutzungen 15 is simplified.

The transfer film 5 is substantially tangentially past the press roll 3 or this only in a small circumferential angle to the press nip 6 and be removed. 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 collecting roller 9 is shown, which rewinds the used film material. Again, a rotary drive 7 is provided, which is controllable. 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 Pressbespan- 10 or press coating is preferably very smooth.

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 image-wise 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 onto a sheet-guiding surface of the coating module 2 after the transfer nip 6 and, if necessary, sealed off from the dryer 16 or onto a sheet-guiding surface of a further sheet guiding the further coating module 2. 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.

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

FIG. 2 shows a basic embodiment for this purpose, which represents an integrated film transfer module for film transfer for use in a sheet-processing machine, for example a printing press. in this connection In contrast to the embodiment according to FIG. 1, the coating module 2 is embodied integrated in the structural unit.

The film transfer module is equipped as follows: - A sheet leading impression cylinder 4 can have one or more gripper fields with associated pressure surfaces and a corresponding one to multiple extent to transport sheets.

- The impression cylinder 4 is assigned in the quadrant A an applicator 1. The applicator 1 has a forme cylinder 20, an applicator roller 21 and a metering system 22. By means of the applicator 1 can have a on the

Form cylinder 20 spanned printing form imagewise coatings are applied to the impression cylinder held on 4 sheets.

- The counter-pressure cylinder 4 is assigned in the quadrant B a integrated in the film transfer module coating module 2. According to the embodiment of FIG. 1, the coating module 2 likewise serves for film transfer and has a transfer cylinder in the form of a press roll 3 which forms a transfer nip 6 with the impression cylinder 4. Furthermore, a film supply roll 8, a film collecting roll 9 and possibly web guides for a film web of transfer film 5 guided around or tangentially past the pressure roller 21 are provided.

In this way, an integrated film transfer module is formed, which has two workstations, which are used for the following steps:

- A sheet to be coated is provided in the first workstation (applicator 1) in the nip between the forme cylinder 20 and counter-pressure cylinder 4 by means of a printing plate and the metering system 22 via the applicator roller 21 on the forme cylinder 20 generated adhesive pattern.

Then, the printing sheet in the following work station (coating module 2) is guided together with the transfer film 5 through the transfer nip 6 between a cylinder equipped as a press roller 3 and the impression cylinder 4, the transfer film 5 being pressed against the signature in the transfer nip 6. By pressing is in the range of adhesive pattern of Transfer the transfer sheet 5 an imaging layer on the sheet. The film web of the transfer film 5 is hereby unrolled in the direction of the rotational movement of the counter-pressure cylinder 4 from the film supply roll 8, around the press roll 3 around or approximately tangentially past it and rolled onto the film collection roll 9.

Such a device can be used in a paint module of a sheet-fed printing press, which already has all the necessary elements in its basic design. For the said application, a chamber doctor blade system can be used instead of feeding the paint for the adhesive metering via the anilox roller and the forme cylinder, e.g. be used by means of a recessed blanket or a Flexod jerk form on the substrate.

The coating module 2 is essentially suitable for forming a printed sheet before printing with an imaging layer, e.g. to provide a metallization layer. Within the sheet processing machine receiving the coating module 2, however, the coating module 2 can also be placed at any other location within the machine. This is to enable the desired imaging layers, e.g. Metallisierungs- layers, both before, as well as after and between the application of ink layers can be done. Advantageously, the coating module is designed as a transportable unit.

According to the mentioned embodiment, it is also possible to provide a plurality of coating modules 2 within a sheet-processing machine in succession.

Various combinations of the assignment of coating modules 2 and applicators 1 to a printing press are shown schematically in FIGS. 3 to 6.

FIG. 3 basically shows a conventional configuration. A sheet feeder AN of the sheet-fed printing machine is first an applicator 1 and then a Subordinate coating module 2. The coating module 2 is again followed by printing units D of the sheet-fed printing machine. A bow boom AU completes the configuration.

By means of this configuration, therefore, an imagewise coating with metallized film can take place on the empty printed sheet. Thereafter, a multicolored printed image can be applied over this coating. Likewise, by means of the coating module 2, a full-surface coating with metallized film can be produced, which can subsequently be overprinted in the printing units D. It is indicated that a coating module 2 can also be subordinated to the printing units D in front of the sheet delivery AU, wherein the printing unit D upstream of the coating module 2 can serve as a commissioning unit 1. By means of this arrangement, for example, a subsequent lamination or the support of a metallized image-wise coating without overprinting possible. For this, the color print should be dried beforehand.

FIG. 4 shows a comparable configuration to FIG. 3. In this case, two film transfer modules are arranged downstream of the sheet feeder AN as integrated coating modules IM. In this case, both a coating module 2 and an associated application unit 1 are arranged within a working unit (see also FIG. 2). Thus, according to a previously mentioned method example, the image-wise application of two different, next to each other, but possibly cross-over coatings are made. The arrangement of an integrated coating module IM is particularly useful if at least two film transfer modules are to be arranged directly one after the other.

FIG. 5 shows a flexible variant for a printing machine with further improved characteristics of the further processing of signatures. The film transfer module is designed here as an add-on module AM. Such an attachment module AM is preferably designed as a transportable unit and can be placed on a standardized substructure UB of a printing unit D of the printing press. For this purpose coupling mechanisms are necessary, which can be represented in many ways. A substructure UB usually contains one Frame in which a sheet transport drum and an impression cylinder 4 are associated with each other. Optionally, a printing blanket cylinder 13 of an offset printing unit or a forme cylinder 20 of a lacquer module can each be assigned to the impression cylinder 4 on the substructure. The printing blanket cylinder 13 or forme cylinder 20 can be used in conjunction with the coating module 2 as a press roller 3, wherein a corresponding clothing 10 is to be attached. Corresponding clamping devices are available on both cylinder types.

FIG. 6 shows a further developed variant. The printing press shown has, after two printing units D connected to the sheet feeder AN, a so-called turning device W. Turning devices W serve to invert a single-sided printed or coated printed sheet during sheet-fed operation of a sheet-fed printing press, so that its previous underside becomes the upper side, which can subsequently be printed or coated.

In the configuration shown, the applicator 1 and a coating module 2 adjoin the turning device W. After that, several further printing units D are provided as far as the sheet extractor AU.

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

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

Described is therefore a sheet-fed rotary printing machine with offset, gravure, flexographic printing units or inking units, which are available as off-line or in-line Combination of the printing process with a unit for cold foil application is connected.

The adhesive is applied in an upstream printing unit or coating module by means of conventional offset technique via a dyeing and / or dampening unit, a FIe xodruckwerk as an inking unit, possibly with associated dampening unit or a gravure printing unit. As machine configurations are conceivable:

A) Sheet-fed rotary printing press: 1.) Waterless offset with zoneless short inking unit

2.) Combination short inking unit / conventional offset inking unit with or without dampening unit

3.) Waterless offset with conventional offset inking unit 1., 2. and 3.) in combination with inline-foiler

The advantages are: faster setup, more stable production conditions without dampening solution

B) Sheet gravure: in conjunction with inline-foiler

Combination offset (UV and conv. Offset colors) / gravure

C) Central-cylinder sheet-fed press, e.g. System satellite printing unit with inline-foiler integration

Print, apply, print

D) Offset printing units with foil application and sheet gravure printing are also possible.

E) Pure gravure printing machine with integrated cold foil application. F) Coating by means of cold foil application, the foil being preprinted (gravure printing process).

G) Substrates can be pre-structured (1-4) and then finished (cold foil) or a direct embossing in the foil area takes place after application (including punching).

LIST OF REFERENCE NUMBERS

1 applicator

2 coating module

3 press roll

4 impression cylinders

5 transfer foil / foil web

6 transfer gap

7 roller drive

8 foil supply roll

9 foil collecting roll

10 press clothing

11 inking / dampening unit

12 plate cylinders

13 blanket / blanket cylinder

14 film guide

15 print protection

16 dryers

17 Inspection device / monitoring system

18 dancer roller

19 cylinder channel

20 form cylinder

21 applicator roll

22 dosing system

D printing unit

W turning device

AN sheet feeder

AU sheet delivery

UB substructure

IM integrated film transfer module

AM attachment module

Claims

claims

1. A device for transferring image-forming layers from a carrier film, which together form a transfer film (5), on printed sheets at least with an applicator unit (1) for a pictorial coating of the

Printing sheet with an adhesive and with a coating module (2) for transferring the imaging layers from the carrier film to the printing sheet in a transfer nip (6) between an impression cylinder (4) and a press roller (3), the carrier film having the coated side in contact with the sheet together with this by the

Transfer gap (6) is feasible and thereby the image-forming layers are imagewise transferable to the sheet, characterized in that the coating module (2) as a unit with a device for guiding a film web of the transfer film (5) to the transfer nip (6) out and from the transfer nip (6) away and that the coating module (2) is assignable to an applicator (1), such that within the coating module (2) receiving sheet processing machine, the coating module (2) can be placed anywhere on the machine, wherein the machine is a printing machine after the printing process of waterless offset or gravure printing or a printing machine after satellite construction.

2. Apparatus according to claim 1, characterized in that the sheet-processing machine is a printing press with a plurality of printing units (D) for generating a colored imprint and that the coating module (2) upstream of the printing units (D), interposed or downstream.

3. Device according to claim 1 or 2, characterized in that the coating module (2) as a film transfer module in the manner of transportable to a printing unit (D) couplable unit is formed.

4. Apparatus according to claim 1 to 3, characterized in that a coating module (2) for full-surface coating within a sheet-processing machine is arranged downstream of several printing units for generating a multi-colored imprint and that by means of the coating module (2) a lamination is performed.

5. Apparatus according to claim 1 to 3, characterized in that a coating module (2) for full-surface coating within a sheet-processing machine is arranged upstream of several printing units for generating a multi-color imprint and that by means of

Coating modules (2) a lamination is made.

6. Apparatus according to claim 1 to 3, characterized in that within a sheet processing machine a plurality of printing units (D) are arranged one behind the other, that between at least two of the printing units (D) a turning device (W) for everting printed sheets for the forward and Rear side pressure is arranged, and that the turning device is arranged downstream of a coating module (2).

7. The device according to claim 1 to 3, characterized in that a plurality of coating modules (2) are arranged directly behind one another within a sheet-processing machine.

8. The device according to claim 7, characterized in that at least the first coating module (2) adjoining ßenden coating modules (2) are designed as integrated work units.

9. Apparatus according to claim 1 to 8, characterized in that a coating module (2) is part of a printing unit (D).

10. The device according to claim 1 to 8, characterized in that a coating module (2) part with printing units (D) is combined by the method of dry offset.

11. The device according to claim 1 to 8, characterized in that a coating module (2) part with printing units (D) is combined by the method of gravure printing.

12. The device according to claim 1 to 8, characterized in that a coating module (2) is part of a paint module.

13. The apparatus of claim 1 to 8, characterized in that a coating module (2) is part of a printing unit in satellite construction, in which the transfer cylinder is associated with a central counter-pressure cylinders in addition to other cylinders.

14. The device according to claim 1 to 8, characterized in that a coating module (2) is part of a further processing unit.