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DE-102014009632-B4 - Foil transfer device

DE102014009632B4DE 102014009632 B4DE102014009632 B4DE 102014009632B4DE-102014009632-B4

Abstract

A foil transfer device comprising a counter-pressure cylinder (7) for transporting the substrate (2) and a pressure cylinder (6) for pressing the foil web (8) against the substrate (2) on the counter-pressure cylinder (7) in a transfer gap (4) formed by the pressure cylinder (6) and the counter-pressure cylinder (7), wherein a blowing device (15) blows into a discharge gusset (14) of the transfer gap (4) and a deflecting element (13) for deflecting the foil web (8) is provided, which is arranged such that the foil web (8) has a web section extending freely from the pressure cylinder (6) to the deflecting element (13), characterized in that the blowing device (15) is arranged on the same side of the foil web (8) as the counter-pressure cylinder (7).

Inventors

  • Alexander Weber
  • Oliver Wühler
  • Jürgen Bäcker
  • Hansjörg Klein
  • Jörg Dümmel

Assignees

  • HEIDELBERGER DRUCKMASCHINEN INTELLECTUAL PROPERTY AG & CO. KG

Dates

Publication Date
20260513
Application Date
20140627
Priority Date
20130717

Claims (10)

  1. A foil transfer device comprising a counter-pressure cylinder (7) for transporting the substrate (2) and a pressure cylinder (6) for pressing the foil web (8) against the substrate (2) on the counter-pressure cylinder (7) in a transfer gap (4) formed by the pressure cylinder (6) and the counter-pressure cylinder (7), wherein a blowing device (15) blows into a discharge gusset (14) of the transfer gap (4) and a deflecting element (13) for deflecting the foil web (8) is provided, which is arranged such that the foil web (8) has a web section extending freely from the pressure cylinder (6) to the deflecting element (13), characterized in that the blowing device (15) is arranged on the same side of the foil web (8) as the counter-pressure cylinder (7).
  2. Foil transfer device according to Claim 1 , characterized in that the blowing device (15) is arranged between the film web (8) and the counter-pressure cylinder (7).
  3. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing device (15) forms an air squeegee for peeling the film web (8) from the substrate (2).
  4. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing direction of the blowing device (15) is aligned with the substrate (2) on the counter-pressure cylinder (7).
  5. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing device (15) is designed to be adjustable in angle with respect to its blowing direction.
  6. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing air ejected from the blowing device (15) is tempered.
  7. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing air ejected from the blowing device (15) is ionized.
  8. Foil transfer device according to Claim 1 or 2 , characterized in that the blowing device (15) has first blowing openings (16) and second blowing openings (17) oriented transversely relative to the first blowing openings (16).
  9. Foil transfer device according to Claim 8 , characterized in that the second blow openings (17) blow onto the film web (8) within the section of the film web extending freely from the pressure cylinder (6) to the deflecting element (13).
  10. Foil transfer device according to Claim 9 , characterized in that in the film transport direction (3) of the film web (8) a further blowing device (18) is arranged after the deflecting element (13) and blows onto the film web (8).

Description

The present invention relates to a foil transfer device for transferring foil onto a substrate. Lamination uses a multi-layered film web, from which a film layer is transferred to the substrate in a transfer gap. The transfer gap is formed by a counter-pressure cylinder and a pressure cylinder, which the film web wraps around. Within the transfer gap, the pressure cylinder presses the film web against the substrate, which is transported on the counter-pressure cylinder. In DE102006004094A1 A device is described in which a blowing device is arranged on the inlet side of the transfer gap – the so-called inlet gusset – which blows air between the film web and the counter-pressure cylinder. On the outlet side of the transfer gap – the so-called outlet gusset – a support plate pressurized with blowing air is arranged, which is located between the film web and the pressure cylinder and thus on the opposite side of the film web than the counter-pressure cylinder. In EP1676702A1 A device is described in which a compressed air bar is arranged on the exit side of the transfer gap, introducing a burst of compressed air between the film web and the pressure cylinder. The compressed air bar is located on the same side of the film web as the pressure cylinder and on the opposite side from the counter-pressure cylinder. In DE 295 17 315 U1 A foil transfer device is described in which an air squeegee is directed at the transfer foil exiting the transfer gap. The air squeegee is directed at the transfer film within a web section, with which web section the transfer film wraps around the pressure cylinder, so that the web section is not a freely extending web section. With foil transfer machines, a common problem is the so-called "following" of the foil web on the substrate. This occurs when the foil web adheres to the substrate as it leaves the transfer gap, impairing the quality of the transferred foil layer. Previously, the web tension of the foil web was increased as a countermeasure, but this led to other problems, such as transverse waves in the foil web. The invention is based on the objective of creating a further foil transfer device. This problem is solved by a foil transfer device having the features of claim 1. The foil transfer device according to the invention comprises a counter-pressure cylinder for transporting the substrate and a pressure cylinder for pressing the foil web against the substrate on the counter-pressure cylinder in a transfer gap formed jointly by the pressure cylinder and the counter-pressure cylinder. A blowing device blows into a slit after the transfer gap and is arranged on the same side of the foil web as the counter-pressure cylinder. Furthermore, the foil transfer device according to the invention comprises a deflecting element for deflecting the foil web, which is arranged such that the foil web has a section extending freely from the pressure cylinder to the deflecting element. The advantage of this process is that the blowing unit assists in separating the film web from the substrate, thus preventing any impairment of the transfer quality. Therefore, increasing the web tension as a measure against trailing is no longer necessary. The consequential problems that would otherwise arise from increased web tension, such as transverse web waves, are avoided. Constructively and functionally advantageous further developments of the invention result from the following description of an exemplary embodiment and the associated drawing, which shows: 1 a foil transfer device of a printing press and 2 a blowing device of the foil transfer device made of 1 . 1 Figure 1 shows a section of a printing press 1 for planographic offset printing on sheets 2, which can also be referred to as the substrate. The section shows a foil transfer device 3 for laminating the sheets 2 in a transfer gap 4. The sheets 2 are printed in one or more printing units of the printing press 1, which are arranged upstream and/or downstream of the foil transfer device 3 in the sheet transport direction 5 and are not shown in the drawing. The transfer gap 4 is formed by a pressure cylinder 6 and a counter-pressure cylinder 7. In the transfer gap 4, a film layer from a multi-layer film web 8 or pieces of the film layer are transferred onto the surface. The foil transfer device 3 transfers the foil layer onto a sheet 2 that is printed with adhesive or partially coated during lamination. The foil web 8 is a composite foil and comprises, in addition to the foil layer to be transferred (transfer layer), a carrier film (backing layer) and, optionally, a release layer between them, which improves the separation of the foil layer from the backing layer. The pressure cylinder 6 is enclosed by the foil web 8 and presses the foil web 8 against the sheet 2, which is transported by the counter-pressure cylinder 7. The counter-pressure cylinder 7 holds the sheet 2 at its leading edge by means of clamping or suction grippers. The foil layer