DE102005060588A1 - Foil supplying e.g. for cold foil embossing, transfers layers on printed sheet transparency according to work order with coating printed with adhesive and coating work - Google Patents

Abstract

The foil supply transfers layers on a printed sheet transparency according to a work order with a coating printed with an adhesive and a coating work (2). The coating work (2) contains an impression cylinder (4) and a press roll (3), which forms a common transfer gap (6). The transparency is conductible around the press roll (3), in such a manner that together with the coated side presented on the printed sheet with the impression cylinder (4) and under pressure with the printed sheet a transfer gap (6) is provided between the press roll and the impression cylinder (4). The layers after removal of the printed sheet and removal from the transfer gap (6) are removed from the transparency. The press roll has a smooth cover (10) and a mechanism is provided to reduce or abolition the adhesion of the surface of the cover opposite the transparency (5). An air film is provided to the transfer gap (6) for the production of an air layer between transfer foil (5) and surface of the printed sheet. An independent claim is included for a method.

Description

The The invention relates to a method and a device for transfer Imaging layers of a carrier sheet on printed sheet after the preamble of the claims 1, 7 and 10.

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 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 unit between the impression cylinder and the press roll 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 press roller resting on the impression cylinder Sheet is associated with the film material. there The downwardly lying metallic layer is a close connec tion with the adhesive areas on the sheet. After further transporting the sheet, the metallic adheres 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.

It is known such coating units, for example in printing units of printing presses. A disadvantage of the known devices is that they are not flexible and that the consumption on transfer film is expensive.

task The invention is therefore to provide a device by means of which the carryover an imaging layer e.g. a metallization layer sure can be economical and accurate, the device simple should be manageable.

The solution This object is achieved in devices according to the features of claims 1 and 7, as well as in a method according to the features of claim 10.

Favorable Way becomes a guide the transfer film uses a timing method in which the transfer film while a Taktungsschritt with pneumatic means separated from the press roll becomes.

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 transmission of the imaging or metallization takes place.

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 roll then under the transfer film passes through.

Farther The film transport can be stopped if auxiliary functions like washing or set-up procedures on the press are.

In In another embodiment, as the surface of the press roll an increased, in Outline contoured pressing surface 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 in a very advantageous manner then stopped can be, 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. In combination with the aforementioned method can so different types of films are used side by side.

Within the the coating plant on When the sheet-processing machine is being used, the coating unit can advantageously be placed anywhere on the machine. In this way, in the case of a printing press having a plurality of printing units, it is possible for imaging coatings or metallization layers to be applied both before, as well as after and also between the application of printing ink layers.

advantageously, it is also possible several coating plants within one sheet processing Provide machine in a row. Thus, the application of various imaging coatings or metallization layers within of a subject in succession.

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

there shows:

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

2 the structure of printing unit with a film transfer device and a film timing,

3 the construction of a printing unit with a simplified film transfer device and film timing, and.

4 the structure of a press roll.

• – Ein Druckbogen wird zunächst mit einem bildgebenden 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 adhesive pattern (applicator 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 roll 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 is applied by means of a release layer. The separating layer serves to facilitate lifting of the imaging layer from the carrier layer. The image-forming layer may be, for example, a metallized layer or a glossy layer or a texture layer or a colored layer or a layer containing one or more image patterns.

The 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 roller 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 kept taut on the inlet side by means of a brake.

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

The press roll 3 can be provided with a press fabric, for example as a plastic coating, comparable to a blanket or blanket. The press fabric 10 is in a cylinder channel 11 held on clamping devices, as in 4 is shown. Here is the press roll 3 as a rubber cylinder 13 educated.

The press fabric 10 is to improve the transmission properties in the transfer nip 6 equipped with a targeted elasticity. This may optionally act in a compressible intermediate layer. This compressibility is preferably similar or less than in conventional blankets or blankets, which can also be used at this point.

The mentioned compressibility can by means of of a conventional compressible blanket. Furthermore, combined fabrics made of a hard blanket and a soft pad can be used.

Furthermore, can directly on the press roller 3 or on the press fabric 10 be provided a limited pressing surface. This may be from the surface of the press fabric 10 be worked out or it can be used as a partial surface of the material of the press fabric 10 additionally on the press roller 3 be attached.

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 roll 3 has a cylinder channel 11 on. In the area of the cylinder channel there is no pressing of the transfer foil 5 between the press roll 3 (Blanket cylinder) and the impression cylinder 4 because both cylinders have this cylinder channel 11 exhibit. The press roll 3 then runs under the transfer film 5 sliding through while the transfer film 5 between press roll 3 and impression cylinder 4 is free to stretch. This condition continues until at the so-called pressure beginning of the cylinder channel 11 ends and the transfer film 5 again between the press roll 3 and the impression cylinder 4 is trapped under inclusion of a printed sheet. Then the transfer film 5 transported further. The timing of the film feed can according to a necessary acceleration or braking of the film supply roll 8th or film collecting roll 9 Start or suspend a little earlier than the channel edges of the cylinder channel 11 pretend. For reaction-fast timing systems via so-called dancer rollers 18 as exemplified in 1 are the control of the rotary actuators 7 the film supply rolls 8th or film collecting roll 9 may not be necessary.

However, the associated device basically includes a corresponding feed control for the transfer film 5 that ensures that at least that between the press roll 3 and the impression cylinder 4 lying film piece is stationary, as long as the cylinder channel 11 passes.

In a further embodiment may be used as the surface of the press roll 3 be provided a contoured pressing surface. For this purpose, instead of a whole-area plastic layer is a limited to the area to be coated pressing surface on the press roller 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.

The function of this limited pressing surface is that as in the passage of the cylinder channel 11 the entrapment of the transfer film 5 only given if the pressing surface is the transfer film 5 touching the transfer gap 6 passes.

A further improvement of the film utilization of the type described results from the fact that the transfer film 5 is divided into one or more Teilfolienbahnen lesser width. Thus, with appropriate control by means of the device or devices for timing the film feed each of the partial film webs, the utilization of the transfer film 5 be improved even with 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.

To improve the coating process, it is provided to bring the film to a standstill in areas where no stripping takes place, such that the press roll 3 empty under the film web 5 passes. This can take place, for example, when the so-called cylinder channel passes through or when a non-pressing region passes through when using a press segment. To stop the film, it is necessary the film relative to the surface of the blanket cylinder 4 or the press roll 5 to solve.

A corresponding device is in 2 shown. This is in the coating plant 2 an arrangement of blowing devices is provided. Each at the inlet of the film web 5 , if necessary in front of a deflection roller, and at the outlet of the film web 5 , if necessary after another deflection roller, is a Blasluftleiste 17 intended. When stopping the film web 5 First, a compressed air surge at the Blasluftleisten 17 in the gap of the inlet or outlet of the film web 5 opposite the press roll 3 brought in. The compressed air surge causes a - possibly thin - air layer between the film web 5 and the surface of the press roll 3 forms. This allows the film web 5 on the press roller 5 slip or float. So can the press roll 3 without risk of damage to the film web 5 continue to rotate while the film web 5 stationary.

In the arrangement of the coating plant 2 is shown that so-called dancer rolls 18 are provided. dancer rolls 18 can in the area of the film supply roll 8th and / or the film collection roll 9 be used. They allow, in addition to a web tension control, that the film web 5 from the film supply roll 8th can be continuously processed while resting at the coating site. This can during further transport of the film web 5 the required film material can be fed again very quickly.

In a simplified form of the coating device according to 3 becomes the film web 5 via an additional pressure roller 14 on the printing cylinder 4 pressed, the pressure point as a transfer gap 6 ' the coating gap for the adhesive between a blanket cylinder 13 and the impression cylinder 4 is subordinate. The pressure roller 14 is by means of known devices against the impression cylinder 4 on and off.

The representation after 3 also shows an integrated embodiment of a film applicator, wherein applicator 1 and coating plant 2 are arranged within a single printing unit. The commissioned work 1 is formed here by the existing printing unit, while the coating plant 2 by the assignment of the pressure roller 14 to the impression cylinder 4 of the printing unit is formed.

The pressure roller formed in this way 14 can easily by means of their facilities for on and off during the time of a continuous cylinder channel or in the range of uncoated parts of the sheet from the impression cylinder 4 be lifted off. At the same time, the film web 5 as described earlier for this case already be shut down. In this case, a ventilation of the film web 5 at the pressure roller 14 not mandatory.

Of the Foil consumption is minimized especially when auxiliary functions on the printing machine, e.g. a washing function to be performed have to. This can be the case with blanket washing or inking unit washing be.

• 1. Die Foliensammelrolle 9 und die Folienvorratsrolle 8 werden über den jeweiligen Rollenantrieb 7 mittels einer Lageregelung in Stillstand gebracht. Es erfolgt keine Folienaufrollung oder -abrollung.
• 2. Die Tänzerwalzen 18 werden festgesetzt, d.h. es erfolgt keine Bahnspannungsregelung.
• 3. Die Folienvorratsrolle 8 oder die Foliensammelrolle 9 wird über die Lageregelung freigeschaltet, um einen bestimmten Bereich der Folienbahn z.B. von 10 mm freizugeben. Der entsprechende Rollenantrieb 7 wird wieder festgesetzt. Damit wird die Folienbahn um die Presswalze 3 bzw. den Drucktuchzylinder herum frei und kann auf dessen Oberfläche schweben.
• 4. Zeitgleich wird Luft über die beiden Blasstangen am Folienein- und -auslauf zum Drucktuchzylinder bzw. zur Presswalze eingeblasen und die Bahn wird zum Schweben gebracht.

To do this, proceed as follows:

• 1. The foil collecting roll 9 and the film supply roll 8th be about the respective roller drive 7 brought to a standstill by means of a position control. There is no Folienaufrollung or -abrollung.
• 2. The dancer rollers 18 are fixed, ie there is no web tension control.
• 3. The foil supply roll 8th or the foil collecting roll 9 is released via the position control to release a certain area of the film web, for example, of 10 mm. The corresponding roller drive 7 will be fixed again. This turns the film web around the press roll 3 or the blanket cylinder around and can float on its surface.
• 4. At the same time, air is blown in via the two blower rods at the film inlet and outlet to the blanket cylinder or to the press roller and the web is levitated.

These Type of shutdown of the film transport is especially at Auxiliary functions of the printing machine used. Here come in Question inking unit washing, rubber cylinder washing, impression cylinder washing or working on paper transport.

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 roll

4

Impression cylinder

5

Transfer film / sheet

6

transfer nip

7

roller drive

8th

Film supply roll

9

Foil composite role

10

Press covering

11

cylinder gap

12

plate cylinder

13

Blanket cylinder

14

pressure roller

15

UV dryer

16

monitoring system

17

Blasluftleiste

18

dancer roll

6 '

transfer nip

Claims (13)

Device for transfer of image-forming layers from a carrier foil to printed sheets at least with an applicator ( 1 ) for an imagewise coating of a printed sheet with an adhesive and with a coating unit ( 2 ) to over carrying the image-forming layers of the carrier film on the printing sheet, wherein the coating plant ( 2 ) an impression cylinder ( 4 ) and a press roll ( 3 ), which has a common transfer gap ( 6 ), and further wherein the carrier film around the press roll ( 3 ) is feasible, such that it 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 ) between press roll ( 3 ) and impression cylinder ( 4 ) and wherein the image-forming layers after the exit of the printing sheet from the transfer nip ( 6 ) is adhered to the printed sheet in the region of the adhesive image-forming regions and is lifted off the carrier film, characterized in that the press roll ( 3 ) with a smooth cover ( 10 ) and that means for reducing or eliminating the adhesion of the surface of the cover to the carrier film ( 5 ) having. Apparatus according to claim 1, characterized in that the transfer gap ( 6 ) pneumatic means for producing an air layer between transfer film ( 5 ) and surface of the press roll ( 3 ) assigned. Apparatus according to claim 1 and 2, characterized in that the film feed by means of a device for film guidance is controllable such that the transfer film ( 5 ) is stopped when in the transfer gap ( 6 ) of the coating plant ( 2 ) no transfer of an imaging layer to a printed sheet takes place and that the pneumatic means the transfer gap between transfer film ( 5 ) and surface of the press roll ( 3 ) apply blowing air. Apparatus according to claim 3, characterized in that a controller in conjunction with the rotary drive ( 7 ) of the transfer film ( 5 ) is provided such that when passing through a gripper of the sheet-guiding counter-pressure cylinder ( 4 ) receiving cylinder channel ( 11 ) the film feed is stopped, wherein the press roll ( 3 ) with further contact of the transfer film ( 5 ) passes through. Apparatus according to claim 3, characterized in that as the surface of the press roll ( 3 ) an elevated, contoured pressing surface ( 13 ) is provided, wherein the pressing surface ( 13 ) is limited to the maximum area to be coated. Apparatus according to claim 1 to 5, characterized in that the transfer film ( 5 ) is divided into one or more partial film webs of lesser width and that the partial film webs next to each other the transfer nip ( 6 ). Device for transfer of image-forming layers from a carrier foil to printed sheets at least with an applicator ( 1 ) for an imagewise coating of the printed sheets with an adhesive and with a coating unit ( 2 ) for transferring the imaging layers from the carrier film to the printing sheet in a transfer nip between a counterpressure and a pressure roller, wherein the carrier film with the coated side in engagement with the printed sheet is feasible together with this through the transfer nip and imagewise on the imaging layers the print sheet can be transferred, and with a device for feeding the transfer film to the coating unit ( 2 ) and for removal from the coating plant ( 2 ) with egg nem drive for moving the transfer film in the working direction, characterized in that the transfer film ( 5 ) around a pressure gap between the blanket cylinder ( 3 ) and impression cylinder ( 2 ) and the surface of the impression cylinder ( 2 ) associated pressure roller is guided, which with the impression cylinder the transfer nip ( 6 ), wherein the adhesive application to the printing sheet in the nip between blanket cylinder ( 3 ) and impression cylinder ( 2 ) he follows. Apparatus according to claim 7, characterized in that the pressure roller opposite the impression cylinder ( 2 ) is switched on and off. Apparatus according to claim 8, characterized in that the pressure roller in the working cycle of the sheet-processing machine to the impression cylinder ( 2 ) is switched on and off. Method for saving film in a device for transferring image-forming layers from a carrier film to printing sheets at least with an applicator ( 1 ) for an imagewise or areal coating of a printed sheet with an adhesive and with a coating unit ( 2 ) for transferring the image-forming layers from the carrier film to the printing sheet, wherein the coating unit ( 2 ) an impression cylinder ( 4 ) and a press roll ( 3 ), which has a common transfer gap ( 6 ), and further wherein the carrier film around the press roll ( 3 ) is feasible, such that it 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 ) between press roll ( 3 ) and impression cylinder ( 4 ) and wherein the image-forming layers after the exit of the printing sheet from the transfer nip ( 6 ) in the region of the areas provided with adhesive on the printing sheet adhering to the carrier sheet is lifted, characterized in that while reducing the web tension of the carrier film ( 5 ) between the surface of the film web ( 5 ) leading press roll ( 3 ) and the carrier film ( 5 ) an air layer is introduced and that the transport of the carrier film ( 5 ) with simultaneously rotating press roll ( 3 ) is shut down. A method according to claim 10, characterized in that the transport of the carrier film ( 5 ) is stopped while carrying out auxiliary functions on the printing press. A method according to claim 11, characterized in that the transport of the carrier film ( 5 ) is stopped during the execution of washing operations for an inking unit or a blanket cylinder or an impression cylinder of the printing press. A method according to claim 11, characterized in that the transport of the carrier film ( 5 ) is shut down while performing paper feed setup operations on the press.