EP1769914A2 - Film transfer device - Google Patents

Abstract

A foil transmission device (100) has an application system (50) for zone-wise application of adhesive onto a flat material, especially leaf-shaped or strip-type printing material and a transmission system (10) for transmitting a layer by an interface onto a support foil under pressure, on a flat material. The transmission foil supply roller (21) and the transmission foil counter roll (27) are positioned above the transmission system or the application system (50), relative to one another so the maximum periphery of the transmission foil supply roller and counter roll (27) overlap.

Description

The present invention relates to a film transfer device for transferring a transfer layer adhering to a carrier film by means of a release layer under the action of pressure on at least area-wise coated with an adhesive sheet material according to the preamble of patent claim 1.

Generic film transfer devices are used in the refinement of printed products, for example, to produce gloss effects. The machines can be subdivided into hot stamping foil machines and cold foil transfer devices. In the latter case, the transfer layer is transferred to the sheet material only under pressure, but not additionally under the action of heat. As a rule, in the case of cold foil transfer devices with a printing unit, which is arranged upstream of the transfer device, adhesive is printed, so that a "printed image" of adhesive remains on the flat material, to which the transfer layer adheres in the film transfer mechanism. Due to the high accuracy of the adhesive application in the printing unit, for example, extremely detailed metallization layers can be transferred to the flat material, for example in the form of texts. Other applications are films of any color, pre-embossed films, etc.

The problem with the film transfer technology is the relatively high space requirement of the film transfer stations.

Therefore, it is an object of the present invention to provide a printing finishing unit which has a smaller footprint than the prior art. This object is achieved with a film transfer device for transferring a by means of a release layer adhering to a carrier film transfer layer under pressure on at least partially coated with an adhesive sheet material with the characterizing features of claim 1. Further features and advantageous embodiments of the device according to the invention will become apparent from the dependent claims and the description below.

The film transfer device according to the invention is characterized in that both the transfer film supply roll and the transfer film waste roll are both located above the same plant, in this case the transfer system or the application system. In this case they should be placed to each other so that the maximum extent of the transfer sheet supply roll and the transfer sheet waste roll overlap. In this way, the space required for the corresponding supply rolls and waste rolls can be minimized. Under transmission system is here a work of the film transfer device to understand, in which a transfer layer to be transferred from a carrier film to a sheet material, d. H. Substrate, is transferred. An application system here is a system in which an adhesive is applied to the substrate, i. on the sheet material, is transmitted. This adhesive can be particularly preferably transferred by means of a printing form partially on the sheet material.

In an advantageous embodiment, it is provided that the transfer film supply roll and the transfer film waste roll are arranged one above the other. In particular, this reduces the lateral extent of the system of transfer sheet supply roll and transfer roll waste roll. Also, this can reduce the incidence of forces that would laterally impact the system, i. it is possible to reduce torsional forces which would act on the transmission system or the application system.

In a further advantageous embodiment it is provided that the transfer film supply roll and the transfer film waste roll are rotatably mounted in the housing of the film transfer device above the transfer system and the application system. This avoids the need to install fixed connections between an extra module and the housing of the transmission system or the application system.

In order to facilitate a retrofitting of a printing press to a film transfer device, it is provided that the carrier film on the outside of the housing runs. Thus, no consideration has to be given to the arrangement of elements inside the housing of a transmission system or an application system. In particular, it is easily possible to use a printing unit of a printing press as the transmission system or the application system.

In order to ensure safe work on and with the film transfer device, it is advantageously provided that the carrier film is covered by a pivotable upper and lower film protection. By allowing the pivoting while maintaining a certain security and working on the carrier film can be achieved.

The application of different transfer layers, in particular color-different transfer layers on the same substrate, d. H. to the same sheet material can be achieved in an inventive development in that a plurality of narrow-gauge supply rolls and / or waste film rolls are each arranged side by side above the transmission system and / or the application system.

In an advantageous embodiment of the invention, it is provided that in order to save spent film, a film buffer system or a film saving device is provided between the transfer film supply roll and the transfer film waste roll. As a result, a timing of the film feed to the transfer nip can be made possible in a simple manner.

Thus, advantageously, acceleration processes of the transfer sheet supply roll and transfer roll waste roll can be intercepted, so that uniform operation of the printing finishing unit is possible.

The film saving device is therefore advantageous because typically only a portion of the sheet material is printed and in between the same speed must move along moving film web, so that the unused film material would be wasted. With a corresponding film saving device this can be prevented.

The printing finishing unit according to the invention is characterized in a favorable further development in that the application system has a printing nip with the same printing cylinder for the area-wise application of adhesive to the flat material. For a very compact design of the printing finishing unit is possible, if only by the lack of second impression cylinder, which would otherwise be assigned to the application system for the adhesive or the transfer cylinder. As a result, the cost of such a printing finishing unit can be reduced. Advantageously, the application system for the adhesive is a printing unit, a coating unit or a modular coating system. Such application systems are present in printing presses either in the case of a printing unit anyway or at least in the case of coating unit or modular coating system (also known as "modular coating system" or MCS) common, so that a corresponding application system can be easily converted into an application system for adhesive can.

In a further advantageous development of the device according to the invention, the transfer cylinder and / or application cylinder can be configured as being detachable from the impression cylinder. As a result, the print finishing unit that is part of a printing press can be turned on or off as needed. If required, the dispensing system can still be used for other purposes, such as the application of normal printing ink, paint, spot colors or other finishing processes with the transfer cylinder off and Druckveredelungseinheit switched off.

Fig. 1:

Schnittansichten durch verschiedene Ausführungsform der erfindungemäßen Druckveredelungseinheit,

Fig. 1a:

wobei die Vorratsrolle und die Abfallrolle nebeneinander oberhalb des Übertragungssystems angeordnet sind,

Fig. 1b:

wobei die Folienvorratsrolle und die Folienabfallsrolle übereinander angeordnet sind,

Fig. 1c:

wobei die Folienvorratsrolle und die Folienabfallsrolle übereinander oberhalb des Auftragssystems angeordnet sind,

Fig. 1d:

wobei die Folienvorratsrolle und die Folienabfallrolle übereinander oberhalb einer gemeinsamen Einheit aus Übertragungssystem und Auftragssystem angeordnet sind;

Fig. 2:

eine maßstabsungetreue Detailansicht der Folienübertragung gemäß Fig. 1d.

A preferred embodiment of the device according to the invention will be described in more detail below with reference to the drawings. In a schematic representation:

Fig. 1:

Sectional views through various embodiments of the inventive pressure refining unit,

Fig. 1a:

wherein the supply roll and the waste roll are arranged side by side above the transfer system,

Fig. 1b:

wherein the film supply roll and the film waste roll are arranged one above the other,

Fig. 1c:

wherein the film supply roll and the film waste roll are arranged one above the other above the application system,

Fig. 1d:

wherein the film supply roll and the film waste roll are arranged one above the other above a common unit of transfer system and application system;

Fig. 2:

a true to scale detail view of the film transmission of FIG. 1d.

The printing finishing unit 100 according to the invention shown in FIGS. 1 and 2 is shown only schematically here. Other required for operation elements such as storage, drives, control, etc., which are not relevant to the invention are shown only schematically or not at all, as they would be obvious to the skilled person alone and would hamper the understanding of the invention.

As shown in Fig. 2 true to scale in detail, in the application system 50 adhesive 2 by means of a job cylinder 51 which rotates in the direction indicated by the arrow, imagewise printed on a sheet material 1. Compared to the thickness of the printing substrate 1 and the diameter of the cylinder 15, the sheet material 1, the adhesive layer 2 and the transfer layer 3 on the sheet material 1 is only very thin. The transfer layer 3, which was previously bonded to the carrier film 5 via a separating layer 6, now adheres to this imagewise applied adhesive layer 2. The layer structure of the carrier film 5, separating layer 6 and transfer layer 3 is shown by way of example true to scale in front of and behind the transfer cylinder. The carrier film 5 is the entire surface over its entire length with a corresponding Separating layer 6 and transfer layer 3 coated. Depending on the transmission, the transmission layer is missing in the transmitted areas.

The application cylinder 51 belongs to an application system 50, such as a normal printing unit of a printing press, e.g. a sheet-fed offset printing press. However, it is clear that the invention also applies to web-processing printing machines application. As an alternative to a conventional printing unit 50, it could also be a coating unit 50 or a modular coating system 50 (MCS). The application system 50 creates an inverse adhesive image on the applicator cylinder 51 similar to ordinary offset printing. For this purpose, the order system 50 is controlled by a controller 40, which is also in communication with the transmission system 10 and controls this and advantageously with a higher-level control of the printing press.

About the application system 50, the film supply roll 21 and the film waste roll 27 are arranged one above the other and rotatably mounted in the housing. Incidentally, a plurality of narrow-gauge film supply rolls 21 and film waste rolls 27 can also be arranged next to one another above the application system 50. In order to save space, as shown in FIG. 1, the film supply roll 21 and the film waste roll 27 should be placed relative to each other so that the maximum circumference 21 ', 27' of the film supply roll 21 and the film waste roll 27 overlap. This is possible insofar as only one of the rollers 21, 27 can be full. Film supply roll 21 and film waste roll 27 are driven by drives, not shown, which are controlled by the controller 40.

The film guide of the transfer film 5 extends on the outside of the housing, but is covered by a pivotable upper and lower film protection 11, 12. In addition, a foil box 13 is disposed between the film supply roll 21 and the film waste roll 27. In this film box 13 dancers, not shown, are arranged, which regulate the web tension. In addition, 13 additional drives for the film 5 may be arranged in the film box, and a film storage, with which the film 5 are moved independently of the movement of the film supply roll 21 and the film waste roll 27 can, and a saving device for film 5, and sensors for monitoring the film surface, the film transfer, etc., and a lifting device for the transfer cylinder, so that the film 5 can be turned off by the printing cylinder 15.

While in particular the method according to FIG. 1d is described by FIG. 2, corresponding alternative embodiments of the device according to the invention are shown in FIGS. 1a-1c. For these figures, the above applies in principle as for Fig. 2; In contrast to FIGS. 2 and 1d, however, here the transmission system 10 and the application system 50 are each spatially separated from one another and are in contact with different pressure cylinders 15. For example, the application system 50 may be a first printing unit of a printing press, and the transfer system 10 may be a second subsequent printing unit of a printing press. FIGS. 1a and 1b show embodiments in which both the transfer film supply roll 21 and the transfer film waste 27 are arranged above the transfer system 10. In Fig. 1a, the two film rolls 21 and 27 are arranged side by side and in Fig. 1b, the two rollers 21, 27 are arranged one above the other or half of the transmission system 10. The guide of the carrier foil 5 via corresponding guide rollers is designed so that the carrier foil 5 is passed through a transfer gap 16 for the purpose of transferring a transfer layer 3. This transfer nip 16 is formed by a transfer cylinder 30 and a printing cylinder 15.

A further alternative embodiment is shown in FIG. 1c, whereby the same applies here as stated above. The two film rolls 21, 27 are arranged one above the other and provided above the application system 50 in the case shown here. Alternatively, of course, an arrangement of roles next to each other would be possible here. The carrier film 5 is guided by corresponding guide rollers from the transfer film supply roll 21 to the transfer nip 16 and then by further guide rollers for transfer film waste roll 27. For better security, the transfer film 5 is not openly guided by a corresponding upper and lower film protection 11, 12. To increase security, it is also provided here that the carrier film 5 extends at least in places below a tread area of the printing press. One not controlled contact of the carrier film 5 during operation can thus be avoided.

By the embodiments described here, a large space requirement for the transfer film supply roll 21 and the transfer film waste roll 27 can be avoided in each case. This is ensured, on the one hand, by the overlap of the maximum peripheries of the transfer sheet supply roll 21 and the transfer sheet waste roll 27, and this is particularly true for the arrangements shown in Figs. 1b, 1c and 1d, with Fig. 1d a preferred case in which no extra application system 50 is physically separate from the factory in which the transfer of the transfer layer 3 is to take place.

LIST OF REFERENCE NUMBERS

1

flat material

2

adhesive

3

transfer layer

5

support film

6

Interface

10

transmission system

11

Upper foil protection

12

lower foil protection

13

foil box

15

pressure cylinder

16

transfer nip

21

Film supply roll

21 '

maximum extent of the film supply roll

27

Film waste roll

27 '

maximum extent of the film waste roll

30

transfer cylinder

40

control

50

application system

51

application cylinder

52

nip

100

Print finishing unit

Claims (11)

Film transfer device (100) with an application system (50) for the areal application of adhesive (2) on flat material (1), in particular sheet-like or web-shaped substrates (1) and a transmission system (10) for transmitting a separation layer (6) on a Carrier film (5) adhering transfer layer (3) under pressure on the sheet material (1), such that the transfer layer (3) only on the adhesive coated with (2) areas on the sheet material (1),
wherein the film transfer device (100) comprises a printing cylinder (15) and a transfer cylinder (30) forming a common transfer nip (16), and wherein
a transfer film supply roll (21) is provided in front of the transfer nip (16) for storing the carrier film (5) and after the transfer nip (16) a transfer film waste roll (27) is provided for winding the carrier film (5),
characterized in that
the transfer sheet supply roll (21) and the transfer sheet waste roll (27) are both disposed above the transfer system (10) or the application system (50) and placed with respect to each other such that the maximum circumference (21 ', 27') of the transfer sheet supply roll (21) and the transfer sheet waste roll (27) overlap. Film transfer device (100) according to claim 1,
characterized in that
the transfer sheet supply roll (21) and the transfer sheet waste roll (27) are arranged above each other. Film transfer device (100) according to one of claims 1 or 2,
characterized in that
the transfer sheet supply roll (21) and transfer roll waste roll (27) are rotatably mounted in the housing of the film transfer device above the transfer system or the application system (50). Film transfer device (100) according to claims 1 and 3,
characterized in that
the carrier film (5) extends on the outside of the housing. Film transfer device (100) according to claim 4,
characterized in that
the carrier film (5) is covered by a pivotable upper and lower film protection (11, 12). Film transfer device (100) according to one of claims 1 to 5,
characterized in that
a plurality of narrow-gauge film supply rolls (21) and / or film waste rolls (27) are each arranged next to one another above the transfer system (10) and / or the application system (50). Film transfer device (100) according to one of claims 1 to 6,
characterized in that
a film buffer system (13) is disposed between the transfer sheet supply roll (21) and the transfer sheet waste roll (27). Film transfer device (100) according to one of claims 1 to 7,
characterized in that
the film transfer device (100) has a film-saving device (13). A film transfer device (100) according to claim 1 or claim 1 and any one of claims 2 to 8,
characterized in that
in that the transfer cylinder (30) of the transfer system (10) forms a transfer nip with the same printing cylinder (15) as the application cylinder (51) of the application system (50) has a nip (52) for the adhesive application (2). A film transfer device (100) according to claim 9,
characterized in that
the transfer cylinder (30) and / or application cylinder (51) of the pressure cylinder (15) is configured Abstellbar. Film transfer device (100) according to the preamble of claim 1 or one of the preceding claims,
characterized in that
at least one printing unit, a coating unit or a modular coating system is arranged as an order system (50) and / or as a transmission system (10).

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