DE102004061952A1 - Method for laminating - Google Patents

Abstract

To transfer a coating from a carrier film to a printed sheet, an image-wise adhesive application is applied to the printed sheet. In a coating unit (2), the carrier film with the coating is then guided past the printed sheet with the coating under contact pressure within a printing press, so that the coating adheres to the adhesive. To increase the flexibility is provided inter alia, to transfer by means of such a device a full or partial area protective layer on a sheet.

Description

The The invention relates to a method and a device for transfer of imaging layers of a carrier sheet on printed sheet the preamble of 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, between two units printing units and a coating unit are arranged. 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 unit with a counter-pressure cylinder and a pressing cylinder 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 unit between the impression cylinder and the press cylinder from a supply roll of film. The foil strip is rewound on the outlet side after leaving the coating unit. 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.

At the Transport of press sheets through the printing unit will print each sheet provided with an adhesive pattern. Thereafter, the sheet is through led the coating plant, wherein by means of the pressing cylinder resting on the impression cylinder Sheet is associated with the film material. there the down-facing metallic layer is in close contact with the areas provided with adhesive on the sheet.

To the further transport of the printed sheet adheres to the metallic Layer only in the area provided with the adhesive pattern at. The carrier foil So the metallic layer is in the range of adhesive pattern taken. The used in this way transfer film will be back wound. The print sheet is laid out in the coated state.

So far In another context, the protection of printed sheets against surface damage known. For this purpose, painting or powdering used, the elaborate Facilities in the machine require the arch but only imperfectly protect.

Farther is known for surface coatings apply special laminates, e.g. Lacquer in a UV process. Again, this results in difficult processes, so that the coating always problematic to handle and the coating result often imperfect is.

task The invention is therefore to provide a device by means of which a protective coating can be safe, economical and accurate, the device should be easy to handle.

The solution This object is achieved in a method according to the features of claim 1 and a device according to the features of the claim 5th

In Advantageously, by means of the described coating method from a transfer film a clear protective layer on a finished Sheet applied in the manner of a lamination. The procedure is economical, because it is executable in a printing unit and so can be integrated inline into a printing process.

to Securing the efficiency of the coating process can be provided to control the film feed such that the Transfer film is then stopped, if no transfer of the protective layer he follows.

In Advantageously, a control of the transfer film such take place that when passing through a gripper of the sheet-guiding Impression cylinder receiving cylinder channels of the film feed is stopped, the press cylinder then under the transfer film passes through.

In a further embodiment may as the surface of the pressing cylinder a increased, contoured pressing surface in outline be provided, which limits to the area to be coated is. Therefore is a cut out blanket, a plastic printing form or a glued Andrucksegment suitable. This allows the feed the transfer film can be stopped in a very advantageous manner can if the area to be coated within the image area of the sheet lies.

A Further improvement of the film utilization results from the fact that the transfer film in one or more Teilfolienbahnen lesser Width is divided.

Besides that is in both cases mentioned above Partial coating of a printed sheet possible.

In Combination with the aforementioned method can also be different Foil types are used side by side. This will allow that surfaces produced different film color or different smoothness become.

to Improvement of the gloss effect, the imaging layer by means so-called UV negative pressure paint can be applied. The UV negative pressure ink is by means of the printing unit for the adhesive in a similar manner via an offset printing plate applied.

Within the sheet processing machine receiving the coating unit the coating unit can advantageously at any Place the machine to be placed. This will be for the case A printing press with multiple printing units allows imaging coatings or metallization layers both before, after and as well can be applied between the application of ink layers.

In Advantageously, this is the coating unit as a coating module formed in the manner of a portable unit.

advantageously, it is also possible several coating plants within one sheet processing Provide machine in a row. Thus, the application of various Coatings or metallization layers within a subject take place in succession. It is also possible a first adhesive pattern in a first coating unit with a first imaging To provide coating and metallization and overlaying to apply another, the first enclosing adhesive pattern below and with another coating or metallization layer Mistake.

in the Below, the invention is illustrated in more detail with reference to figures.

there shows:

1 a basic representation of a printing machine with a film transfer device.

• – Ein Druckbogen wird zunächst mit einem bildgebenden oder vollflächigen Klebstoffmuster versehen (Auftragwerk 1).
• – Danach wird im Folgedruckwerk gemeinsam mit einem Druckbogen eine Transferfolie 5 durch einen Transferspalt 6 geführt, wobei die Transferfolie 5 im Transferspalt 6 gegen den Druckbogen gepresst wird (Beschichtungswerk 2).

In 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 printed sheet is first provided with an imaging or full-surface adhesive pattern (Auftragwerk 1 ).
• - Thereafter, in the follow-on printing unit together with a sheet a transfer film 5 through a transfer gap 6 guided, with the transfer film 5 in the transfer gap 6 pressed against the sheet (coating 2 ).

The transfer gap 6 in the coating plant 2 is through a press cylinder 3 and an impression cylinder 4 educated. These may correspond to the blanket cylinder and the impression cylinder of an offset printing unit.

Furthermore, downstream of a so-called calendering be provided. Within the coating plant used for the film transfer 2 a web guide for transfer films is shown.

The transfer foils 5 are multi-layered. They have a carrier layer on which an imaging layer or functional layer is applied by means of a separating layer. The separating layer serves to facilitate the lifting of the functional layer from the carrier layer. The functional layer may be a transparent glossy layer or a transparent textured layer or a colored layer.

The foil supply roll 8th is the coating plant 2 assigned on the side of the sheet feeder. The foil supply roll 8th has a rotary drive 7 on. The rotary drive 7 is used for continuous controlled feeding of the transfer film to the coating unit 2 needed and is therefore controllable. Furthermore, a deflecting or tensioning roller is provided in the region of the film feed. Thus, the film web of the transfer film is always in the same voltage relative to the press cylinder 3 held. On the downstream side of the printing unit is a film collecting roll 9 shown. On the foil collecting roll 9 the used foil material is rewound. Here, too, is a rotary drive for the optimized production 7 provide that is controllable. In essence, the transfer film could 5 also by the rotary drive 7 moved on the drain side and held on the inlet side by means of a brake punishment.

The transfer process of a transparent protective layer on the printing paper takes place in the transfer nip 6 between the press cylinder 3 and the impression cylinder. The press cylinder 3 may be a blanket cylinder of an offset printing unit. The press cylinder 3 can also be the form cylinder of a paint module. It is essential that the surface of the pressing cylinder 3 Thus, the blanket cylinder or forme cylinder is equipped by means of a compressible, damping element.

Furthermore, directly on the press cylinder 3 or on the press cover a limited Be provided pressing surface. This can be worked out of the surface of the press fabric or it can be used as a partial surface of the material of the press fabric additionally on the press cylinder 3 be attached.

through Such a device is provided a printed sheet to be provided with a transparent protective layer. The coating process takes place in the manner described above and serve the full-surface or part of the area Sealing a printed surface. The method can be used as Laminating be designated within a printing press. The protective layer can be visible, invisible, clear, colorless or colored be. Likewise, textured layers can be applied.

The Protective layer can be applied directly to the color print or a varnished Color print to be applied.

It can Also, several layers of different quality are superimposed over each other.

protective coatings of this kind can inline while in a simple way a printing process or offline for post-refinement are applied.

To ensure the efficiency of the coating process is provided that the film feed the transfer film from the film supply roll 8th to the transfer gap 6 and to the foil collecting roll 9 is controllable so that as far as possible the transfer film 5 is then stopped if no transmission of the imaging layer is to take place:
For this purpose, a control of the transfer film 5 such that when passing through a gripper of the sheet-guiding impression cylinder 4 receiving cylinder channels of the film feed is stopped. The grippers hold the signature on the impression cylinder 4 , Also the press cylinder 3 has a cylinder channel. In the area of the cylinder channel there is no pressing of the transfer foil 5 between the press cylinder 3 (Blanket cylinder) and the impression cylinder 4 , The press cylinder 3 then runs under the transfer film 5 sliding through while the transfer film 5 between press and impression cylinder 4 is free to stretch. After the channel passage, the transfer film 5 transported further. For reaction-fast timing systems via so-called dancer rollers 18 as exemplified in 1 are a control of the rotary actuators 7 the film supply rolls 8th or film collecting roll 9 may not be necessary.

In a further embodiment, as the surface of the pressing cylinder 3 be provided a contoured pressing surface. For this purpose, instead of an all-over plastic layer, a pressing area on the pressing cylinder is limited to the area to be coated 3 used. For this purpose, for example, a cut-out printing blanket, an imageable plastic printing form or a pressure pad which can preferably be releasably fastened to a smooth base, possibly stickable or magnetically attachable, can be used to support the limited pressing surface.

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.

To improve the gloss effect, the protective layer can be applied by means of an adhesive reacting to ultraviolet radiation. Here, so-called UV negative pressure ink by means of the applicator 1 applied to the adhesive in a corresponding manner via an offset printing plate. This results in improved smoothness and thus gloss effect of resting on the sheet protective layer. To carry out the UV technology is a UV dryer 15 either after the order work 1 to provide predrying of the adhesive application. On the other hand, even after the transfer of the imaging layer in the coating plant 2 a protective layer penetrating UV dryer 15 for example, on the impression cylinder 4 of the coating plant 2 to be ordered.

In combination of known methods, the transfer of a first adhesive pattern in a first applicator can also 1 done and in a first coating plant 2 be provided with an imaging metallization. Overlaying this can be done in a following order 1 another, the first enclosing or overlapping adhesive pattern applied and in a second coating plant 2 be provided with the protective layer. In this way, for example, first an image pattern of a silver-colored layer and then a full-surface protective layer can be produced in a coating pass.

Based on the present embodiments, it is possible various coatings in the transfer process of a transfer film 5 to transfer to different substrate materials. The detailed embodiments of the invention are not limited to the possibilities given here, but may be interpreted beyond the skill of the art.

1

commissioned

2

coating plant

3

press cylinder

4

Impression cylinder

5

Transfer film / sheet

6

transfer nip

7

roller drive

8th

Film supply roll

9

Foil composite role

10

Press covering

15

UV dryer

16

monitoring system

18

dancer roll

Claims (9)

Method for transferring functional layers from a carrier film to printed sheets in a device having at least one applicator unit ( 1 ) for coating a printed sheet with an adhesive and with a coating unit ( 2 ) for transferring a functional layer from the carrier film to the printing sheet, wherein the coating unit ( 2 ) an impression cylinder ( 4 ) and a pressing cylinder ( 3 ) containing a transfer nip ( 6 ), and further wherein the carrier film on the pressing cylinder ( 3 ) is guided past, so that they with the coated side on the on the impression cylinder ( 4 ) guided printed sheet and under pressure together with the sheet through the transfer nip ( 6 ) is guided, so that the functional layer after the exit of the sheet from the transfer nip ( 6 ) is lifted in the adhesive areas provided on the sheet adhering to the carrier film, characterized in that a fully or partially adhesive layer is applied after printing on a printed sheet and that of a carrier film a full or partial protective layer in the transfer nip ( 6 ) is adhesively transferred to the sheet by means of the adhesive layer. Method according to claim 1, characterized in that that a full-surface or partial protective layer on a printed sheet after the application of the last coat of paint is applied. Method according to claim 1, characterized in that that a full-surface or partial protective layer on a printed and varnished sheet after the order of the last Paint layer is applied. A method according to claim 1 to 3, characterized in that the protective layer is transparent, visible or invisible. Method according to Claims 1 to 3, characterized that stained the protective layer or textured. A method according to claim 1 to 5, characterized in that the protective layer of a divided into one or more partial film webs of lesser width carrier film in one or more sub-areas next to each other in the transfer nip ( 6 ) is transmitted. Method according to Claims 1 to 6, characterized that the protective layer of the Teilfolienbahnen with different from each other Properties are provided, with layers of different color and / or different gloss and / or different surface structure can be generated. Method according to Claims 1 to 7, characterized that the protective layer on a printed sheet in an arc Processing machine, in particular a printing machine with several Printed matter, transferred and that the coating process upstream of the printing units, is interposed or subordinate. Method according to Claims 1 to 8, characterized that a protective layer multilayered on a printed sheet in several coating processes applied sequentially within a sheet processing machine becomes.