EP2285720B1 - Embossing machine comprising a film web guide device - Google Patents

Description

The invention relates to a flat embossing machine with a film web guiding device for a plurality of film webs, which are guided by unwinding rollers on a stamping plate of a flatbed press according to the preamble of claim 1. With such flat embossing printing machines, such as in the EP 0 858 888 Particularly high embossing performances can be carried out in the best quality and also for demanding embossing tasks. On the other hand, these flat embossing machines also place particularly high demands on the guidance and precise preference of the thin and very sensitive embossed foil webs, with layer thicknesses of, for example, only 12-20 μm (0.02 mm). Several film webs of different types (with different web widths, preferred lengths and with different detachment forces after embossing) must at the same time be smoothly guided and conveyed smoothly. The film guide must be perfectly flat and properly positioned without distortion, hull formation, wrinkles and dislocations. And the rapid, intermittent preference in a short time must be performed optimally gentle, in order to achieve high performance and quality. Such a flat embossing machine and film web guide is for example from the EP 1 593 503 known. This film web guide has for gentle, better adjustment of the tension in the film webs on a wide, flat suctioned brake and guide wall in front of the embossing table, with an adjustable negative pressure in the braking and guide wall, the tension of the film webs running over it can be regulated. This allows a Film web guide, which does not require contact with guide elements on the sensitive preshaped side (image side) of the film webs and it allows very good stamping qualities with color film webs.

With these known film web guides, however, it is not possible for demanding image stamping tasks, in particular for hologram embossing with image security features, eg for banknotes, ID cards or banknotes, with multiple image film webs over the entire embossing table for all embossing film webs optimal, error-free positioning of the image marks and thus also the embossed images to reach. For this, each individual image film web in the preferred direction X and in the transverse direction Y would have to be able to be optimally adjusted separately while the machine is running. This is with the known film web guide after EP 1 593 503 , which is considered the closest prior art, but not possible.

It is therefore an object of the present invention to provide a better film web guide for flat embossing machines with an optimal image positioning in the X and Y direction for all image film webs over the entire embossing, which also allows the optimal setting of the film tension in each individual image film web while the machine is running, especially for hologram embossing.

This object is achieved according to the invention by a flat embossing machine having a film web guiding device with a plurality of individual, controllable guide paths for the individual image film webs as film clamping devices in front of the embossing plate according to claim 1.

The dependent claims relate to advantageous developments of the invention with further improvements in the film web guidance and positioning of the individual image film webs and thus also the machine performance and image quality.

Fig. 1

eine Seitenansicht einer erfindungsgemässen Flachprägedruckmaschine mit einer Folienbahnführungseinrichtung mit mehreren einzelnen Führungsbahnen je mit steuerbaren Unterdruckquellen als Folienspanneinrichtungen für die einzelnen Bildfolienbahnen,

Fig. 2

ein Beispiel einer Folienbahnführungseinrichtung mit Führungsbahnen und zugeordneten Funktionselementen,

Fig. 3

eine Frontansicht auf die einzelnen symmetrischen Führungsbahnen,

Fig. 4

einen Querschnitt durch eine Führungsbahn mit Saugkanälen mit verschiedenen Zonen für Folienbahnen unterschiedlicher Breite,

Fig. 5

im Querschnitt ein Beispiel einer Führungsbahn mit Saugkanälen mit zwei Zonen,

Fig. 6

eine Aufsicht auf die Führungsbahn von Fig. 5 mit Absaugöffnungen,

Fig. 7

ein weiteres Beispiel einer Führungsbahn mit Absaugöffnungen,

Fig. 8

ein Beispiel mit mehreren einzelnen Führungsbahnen und Bildfolienbahnen,

Fig. 9

ein Beispiel mit einzelnen Führungsbahnen für Bildfolienbahnen und einer zusätzlichen kurzen Brems- und Führungswand für Farbfolienbahnen,

Fig. 10a, b

den einzelnen Führungsbahnen zugeordnete einstellbare Seitenführungselemente,

Fig. 11

ein Beispiel von zusammen einstellbaren Seitenführungselementen,

Fig. 12

eine Steuerung des zeitlichen Geschwindigkeitsverlaufs des Folienvorzugs mit erhöhter Haftung beim Prägeprozess,

Fig. 13

ein Beispiel mit steuerbaren Unterdruckquellen und Vakuumschaltventilen.

In the following the invention with reference to examples and figures will be further explained. Show it:

Fig. 1

3 a side view of a flat embossing printing machine according to the invention with a film web guiding device with a plurality of individual guide webs each with controllable negative pressure sources as film clamping devices for the individual image film webs,

Fig. 2

an example of a film web guide device with guideways and associated functional elements,

Fig. 3

a front view of the individual symmetrical guideways,

Fig. 4

a cross section through a guide track with suction channels with different zones for film webs of different widths,

Fig. 5

in cross-section an example of a guideway with suction channels with two zones,

Fig. 6

a view of the guideway of Fig. 5 with suction openings,

Fig. 7

another example of a guideway with suction openings,

Fig. 8

an example with several individual guideways and image foil webs,

Fig. 9

an example with individual guideways for image film webs and an additional short braking and guiding wall for color foil webs,

Fig. 10a, b

adjustable side guide elements associated with the individual guideways,

Fig. 11

an example of jointly adjustable side guide elements,

Fig. 12

a control of the temporal speed profile of the film preferred with increased adhesion during the embossing process,

Fig. 13

an example with controllable vacuum sources and vacuum switching valves.

Fig. 1 and 2 show a flat embossing printing machine 1 according to the invention with a film web guide device 2 with several film webs 6.1- 6.4, which are guided by unwinding 7.1- 7.4 on a stamping plate 3 with Cliches 28 and a counter-pressure plate as embossing 8 on a flat bed press 4. At the embossing 8 film images are impressed on a flat material 5, 5.1, 5.2. The film web guide has for each film web after the embossing plate Folienvorzugseinrichtungen 9.1- 9.4 and before the embossing plate 3 individual, adjustable in the transverse direction Y to the preferred direction X, long, centrally symmetric trained guideways 11.1 - 11.4 as film clamping devices. The individual guideways contain suction channels 16, 17 and have a smooth, low-friction surface 12 with suction openings 14, which are connected to controllable negative pressure sources 13.1 - 13.4 for independent adjustment of negative pressure pi and braking force zfi at each individual guideway 11i. In this case, each image film web 6i each image mark sensor 15i on or between the film advancing device 9i and the guide rail 11i and adjustable, two-sided side guide elements 30 are assigned to low-friction deflecting 31, 32 directly in front of the guideways 11i and after the embossing plate 3, with which side guide elements 30, the image film webs 6i centered on the guideways 11i are feasible. In this way, each individual image film web can be optimally adjusted to the image marks in the X and Y directions while the machine is running, and image position errors can thereby be minimized.

The optimum adjustment and positioning of each image film web 6i in the transverse direction Y is effected by adjusting the side guide elements 30 on low-friction deflecting elements 31, 32 directly in front of the guide tracks 11i and after the embossing point 8. This centered guidance of the image film webs 6i on the correctly positioned, symmetrical long guide tracks 11 i until close to the embossing 8 prevents lateral deviations. The positioning of the image film webs in the X direction, ie the exact alignment of the image marks 27 By means of the image mark sensors 15i in the error-free desired position is achieved by control and adjustment of the negative pressure pi in the guideways 11i. Error-free positioning in the X and Y directions can only be achieved by independently adjusting each individual film web 6i while the machine is running.

The image mark sensors 15i can preferably be arranged on the film advance devices 9i, in the center of the embossing plate 3 (on the cliché) or at the end of the guide paths 11i.

For embossing, all image film webs at the embossment point 8 must have a certain optimum tensile stress z, which corresponds to a corresponding elongation ee of e.g. ee = 0.6% corresponds. This elongation is effected over an embossing table length of e.g. 100 cm an extension of the film webs by 6 mm. Taking into account this extension, the cliches 28 are positioned on the embossing plate with optimum elongation ee or tensile stress z. If the tensile stresses zi (and thus the strains eei) in the individual image film webs 6i deviate from the nominal value, correspondingly large image position errors occur. For an error-free image positioning, therefore, all image film webs 6i must have the optimum tensile stress zi. The tensile stress zi for a film web 6i is composed of tensile stress zai in front of the guide track plus braking force or tensile stress zfi exerted by the guide track 11i: zi = zai + zfi. Since the tensile stresses zai in front of the guideways 11i are very different, only by appropriate control of the tensile stresses zfi at each individual guideway 11i can the optimum value zi be achieved for all image foil webs 6i.

The film webs are fed from unwinding rolls 7 via a film store 20 (FIG. Fig. 1 ) guided to the guideways 11. As a film storage preferably vacuum loop memory 20, in particular horizontal vacuum double-loop memory used with negative pressure control, which eg from the EP 0 858 888 are known. In the film store 20, a first tensile stress za is exerted on the film webs for optimal guidance to the guideways 11. These tensile stresses za vary in time and are very different for different film webs 6i (zai), depending on the type and width of film, loop length in the memory and Type of intermittent preference.

With the inventive film web guide after Fig. 1 It is achieved that over the entire length of the film web guide from the unwinding rollers 7 via the vacuum loop storage 20 and the guide tracks 11 to the embossment 8 no guide elements on the embossing page 6a of the film webs are present, ie that the sensitive embossing page 6a nowhere contacted and worn.

A well metered control of the braking force zfi on the film webs 11i and thus the optimum voltage zi at the embossing point 8 is achieved by a smooth, low-friction, abrasion-resistant surface 12 with constant coefficients of friction of the long guideways. For this purpose, the surfaces 12 preferably have a minimum electrical conductivity, so that no electrostatic charging of the guideways 11 and the film webs 6 can arise.

Suitable surfaces 12 may consist, for example, of a layer of fluoropolymer plastic or of hard anodized aluminum with intercalated fluoropolymer (eg PTFE), for example in a layer thickness of, for example, 20-50 μm. These have relatively low and constant friction coefficients of, for example, 0.1-0.2.

Preferably, these surfaces 12 exhibit as small differences as possible between static friction and sliding friction coefficients of the film webs of e.g. not more than 10 - 20% on the generation of uniform tensile stresses zfi.

Fig. 2 shows in more detail another example of a guide device 2 with four image film webs 6.1- 6.4 and with associated vacuum sources 13.1-13.4, which are designed here as controllable vacuum regulator 22.1- 22.4 and connected to a central suction fan 23. The suction fan provides a constant negative pressure (of eg 20 kPa), which is reduced by the vacuum regulators to the required negative pressures pi at each guide track 11i (eg 5-10 kPa) to produce the optimum tensile stresses zfi with zi = zai + zfi in each image sheet.

As a further advantageous embodiment, film web tension sensors 40i can be arranged after the guideways 11i for determining the foil tensions, whereby the control of the vacuum sources 13i can be carried out as regulation to an adjustable desired value of the foil tension zi or the foil stretching ee.

As Fig. 2 illustrated, the film web guide according to the invention can be used both in sheet-embossing machines and in roll machines. The flat material 5 to be embossed consists of sheets 5.1, which are conveyed by a feeder 71 to a boom 72 or endless webs 5.2 in reel machines, which are conveyed from a unwinding roll to a take-up reel (as in eg EP 0 858 888 describe).

Fig. 3 shows a front view of individual guideways 11.1 -11.5, which have a width b and a length L (with L> b). The five image film webs 6.1-6.5 here have different film widths b1: the film web 6.3 a relative small film web width b1.2 and the remaining film webs a relatively large film web width b.1.1.

For optimum film guidance and adjustment of the tensile stresses zfi or zi, the adjustable and replaceable symmetrical guide tracks 11i reach close to the embossing point 8 and are preferably as long as possible with a length L of e.g. 50-100 cm and with a ratio of length to width L / b in a range between 5 and 15. The width b of the guideways is for example 5 to 10 cm.

The Fig. 4 and 5 show in cross section examples of guideways with suction channels, which are particularly suitable for different film web widths b1. Fig. 4 shows a guideway with suction channels, which form a central zone with a suction channel 16 and two symmetrical edge zones with the suction channels 17.1 and 17.2. In accordance with the film web width b1, only the zones covered by the film web can be connected to the vacuum source 13i and evacuated. So a very even pressure distribution (pi) can be achieved.

Fig. 5 shows an example of a guideway with a central suction channel 16 and with two subsequent, mutually connected lateral suction channels 17, which are connected via a faulty air switching valve 18 with the vacuum source 13i. Uncovered zones will not be evacuated here. A narrower film web 6.2 with width b.1.2 covers the suction channel 16 and a wider film web 6.1 with b1.1 also covers the suction channels 17th

Fig. 6 shows a plan view of the guideway of Fig. 5 with a few, relatively small suction openings 14 with a diameter of eg 1-2 mm, which are arranged at large intervals symmetrically to the central axis. The very small areal proportion of the suction openings is preferably in a range of, for example 0.5 - 3%. This makes it possible to generate easily adjustable, defined braking forces and tensile stresses zfi. The surface 12 with suction openings 14 may also consist of an air-permeable microporous layer, for example, analogous to the air cushion support surface 37 of Fig. 10a , which is sucked instead of ventilated.

Fig. 7 shows a further example with a symmetrical arrangement of suction openings 14, which are divisible into different zones, analogous to Fig. 4 ,

Fig. 8 shows an example with eight narrow guideways 11.1-11.8 with suppression p1-p8 for eight image film webs 6.1- 6.8 for correspondingly high Bildprägeleistungen.

Fig. 9 shows an example of a film web guide in the image film webs 61, 6.2 are combined with color film webs 6.11, 6.12. For this purpose, a short and wide braking and guiding wall 10 can additionally be arranged as a film tensioning device for the simultaneous embossing of color film webs 6.11, 6.12 and a plurality of image film webs 6.1, 6.2. This allows a very wide range of application of the embossing machine from pure color foil stamping to pure image foil stamping.

Such a brake and guide wall is in Fig. 2 shown and also from the EP 1 593 503 known. However, this is not suitable for several image film webs, since their tensile stresses zi can not be individually regulated and adjusted while the machine is running.

The 10 and 11 show examples of transversely adjustable Y side two side guide elements 30 on low-friction deflecting elements 31, 32, with which the image film webs 6i in the Y direction exactly to the optimum Picture mark positions can be set. For fixed deflection elements, the film webs on the deflecting elements in the Y direction must be very easy, as frictionless as possible, can be moved. For this purpose, the deflection elements 31, 32 may be formed as air cushion bearing surfaces 37 and, for example, consist of an air-permeable microporous layer which is ventilated.

The Fig. 10a, b show in side and front view an example of a virtually frictionless deflection element 31, which is formed as a curved air cushion support surface 37. First, the guide track 11i is correctly positioned when the machine is stationary, and the distance of the two-sided side guide elements 30, which are here mounted displaceably on the deflecting element (db1), is set to the film width b1. Then both side guide elements 30 can be adjusted together with the deflection element (with the machine running) in the Y direction to the optimum image mark position (± Y).

Fig. 11 shows another example where the two side guide members 30 are adjustable to the film width b1 (db1) attached to a connecting element 34. They are so displaced together in the transverse direction Y and adjustable. This setting (± Y) can for example be transmitted via a flexible shaft 36 to a control panel and with a setting thread 35 manually or by servo motor (actuator) can be performed.

After advancing the film webs 6i in the next embossing position and the standstill of the film webs for the embossing step, a slight slipping may occur. To prevent this, the film webs can be pressed against the guideways 11 i stronger on this just before the standstill by increased negative pressure pi and slipping of the film webs at a standstill can thus be prevented.

For illustration to this shows Fig. 12 schematically the time course v (t) of the film web speed when advancing to the next embossing position: First, there is a quick preference with high constant acceleration and subsequent deceleration a1 (of eg 10 - 30 m / s ² ) until shortly before the image mark (time t1) , Then, at reduced speed v2 (of, for example, 5 cm / s), the detection of the image mark (27) by the image mark sensors 15i takes place at time t2. From time t3, the image film webs 6i are decelerated with much lower delay a2 (eg 2 m / s ² ) and shortly before standstill (at time t4) the negative pressure pi in the guideways 11i is rapidly increased and thus the film webs 6i become stronger pressed the guideways, so that slipping at standstill is prevented.

Fig. 13 shows an example for generating this rapid increase of the negative pressure pi by means of additional fast-switching vacuum valves 24.1 - 24.4, which are connected to the vacuum sources 13.1-13.4, with the central suction fan 23 and with the guideways 11.1-11.4. At time t4 ( Fig. 12 ), shortly before the film webs 6i stop, the vacuum valves 24i are opened rapidly (in msec) and the higher negative pressure p0 of the central suction fan 23 is passed directly to the guide tracks 11i. After the embossing process is switched back to the lower regulated negative pressure pi of the individual negative pressure sources 13.1-13.4.

1

Flachprägedruckmaschine, Flachbett-Prägedruckmaschine

2

Folienbahnführungseinrichtung

3

Prägeplatte, Clicheplatte

4

Flachbettpresse

5

Flachmaterial

5.1

Bogen

5.2

Endlosbahn

6.1, 6.2

Bildfolienbahnen

6.11, 6.12

Farbfolienbahnen

6, 6i

Folienbahnen, Prägefolienbahnen

6a

Prägeschichtseite von 6

7, 7i

Abwickelrollen

8

Gegendruckplatte, Prägestelle

9i

Folienvorzugseinrichtungen

10

Brems- und Führungswand

11, 11i

Führungsbahnen für 6

12

Oberflächen von 11

13, 13i

Unterdruckquellen für 11

14

Absaugöffnungen in 12

15, 15i

Bildmarkensensoren

16

zentraler Saugkanal in 11

17

seitliche Saugkanäle

18

Fehlluft-Schaltventil

20

Vakuumschlaufenspeicher, Folienspeicher

22i

Vakuumregler

23

zentrales Sauggebläse

24i

Vakuumschaltventile

27

Bildmarken auf 6

28

Cliches

29

Folienabzugsvorrichtung

30

Seitenführungselemente

31, 32

reibungsarme Umlenkelemente, Auflageflächen

34

einstellbare Verbindung von 30

35

Einstellvorrichtung für 30

36

flexible Welle

37

Luftpolster-Auflagefläche, Luftpolster-Achsen

40i

Folienbahn-Spannungssensoren

71

Anleger

72

Ausleger

L

Länge von 11

b

Breite von 11

b1

Folienbahnbreite

db 1

Einstellen von b1

ee

Foliendehnungen an 8

za, zai

Zugspannungen vor 11

zf, zfi

Bremskräfte, Zugspannungen von 11

z, zi

Folienspannungen, Zugspannungen an Prägestelle 8, z = za + zf

p, pi

Unterdruck in 11

p0

Unterdruck in 23

v

Folienbahngeschwindigkeit

a

Beschleunigung

t

Zeit

X

Vorzugsrichtung von 6

Y

Querrichtung

The following terms are used in this description:

1

Flat embossing machine, flatbed embossing machine

2

Sheet guide device

3

Embossing plate, cliche plate

4

Flatbed Press

5

flat material

5.1

bow

5.2

continuous web

6.1, 6.2

Picture film webs

6.11, 6.12

Color film webs

6, 6i

Foil webs, embossed foil webs

6a

Preprint page of 6

7, 7i

unwinding

8th

Counterpressure plate, embossing point

9i

Foil advance facilities

10

Brake and guide wall

11, 11i

Guideways for 6

12

Surfaces of 11

13, 13i

Vacuum sources for 11

14

Suction openings in 12

15, 15i

Figurative mark sensors

16

central suction channel in 11

17

lateral suction channels

18

Faulty air switching valve

20

Vacuum loop storage, film storage

22i

vacuum regulator

23

central suction fan

24i

Vacuum switching valves

27

Picture marks on 6

28

Cliches

29

Film takeaway

30

Side guides

31, 32

low-friction deflecting elements, bearing surfaces

34

adjustable connection of 30

35

Adjustment device for 30

36

flexible shaft

37

Air cushion support surface, air cushion axles

40i

Sheet-voltage sensors

71

investor

72

boom

L

Length of 11

b

Width of 11

b1

Sheet width

db 1

Set b1

ee

Film extensions to 8

za, zai

Tensile stresses before 11

zf, zfi

Braking forces, tensile stresses of 11

z, zi

Film tensions, tensile stresses on embossing 8, z = za + zf

p, pi

Negative pressure in 11

p0

Negative pressure in 23

v

Film web speed

a

acceleration

t

Time

X

Preferred direction of 6

Y

transversely

Claims (19)

1. Flat bed embossing machine with a foil web guiding device (2) for several foil webs (6), which from unwinding rolls (7) are conducted over a tool plate (3) on a flat bed press (4), with a foil tensioning device ahead of the tool plate and with foil drawing devices (9) for every foil web after the tool plate, characterised in that

   - directly ahead of the tool plate (3) several individually adjustable in transverse direction (Y) to the drawing direction (X), long, central symmetrically configured web guides (11.1, 11.2, 11.3) are provided as foil tensioning devices,

   - with a smooth, low-friction surface (12)

   - and with suction openings (14) in the surfaces, which are connected with controllable negative pressure sources (13.1, 13.2, 13.3) for the independent setting of negative pressure (pi) and braking force (zi) on every individual web guide (11.1, 11.2, 11.3),

   - wherein to every picture foil web (6i) a print mark sensor (15i) is assigned between the foil drawing device (9i) and the web guide (11i)

   - and lateral guiding elements (30) settable on both sides on low-friction deflecting elements (31, 32) directly ahead of the web guides and behind the tool plate (3) are assigned,

   wherein said lateral guiding elements (30) can guide the foil webs (6i) centered on the web guides.
2. Flat bed embossing machine according to claim 1, characterised in that the surface (12) of the web guides comprise fluoride polymer plastic material or consists of hard anodised aluminium with embedded fluoride polymer (e.g., PTFE).
3. Flat bed embossing machine according to claim 1, characterised in that the surfaces (12) of the web guides comprise a minimum electrical conductivity, so that no electro-static charging of the foil webs can take place.
4. Flat bed embossing machine according to claim 1, characterised in that the difference between the static friction - and the sliding friction coefficient of the foil webs on the surface (12) of the web guides amounts to a maximum of 10 - 20%.
5. Flat bed embossing machine according to claim 1, characterised in that the length L of the web guides (11) amounts to between 50 and 100 cm.
6. Flat bed embossing machine according to claim 1, characterised in that the ratio of length to width L/b of the web guides is situated within a range of between 5 and 15.
7. Flat bed embossing machine according to claim 1, characterised in that the suction openings (14) comprise a diameter of 1 - 3 mm and/or a surface proportion of the suction openings of 0.5 - 3%.
8. Flat bed embossing machine according to claim 1, characterised in that the print mark sensors (15i) are arranged on the foil drawing devices (9i), in the centre of the tool plate (3) or at the end of the web guides (11i).
9. Flat bed embossing machine according to claim 1, characterised in that the deflecting elements (31, 32) ahead of the web guides and after the tool plate are designed as air cushion supporting surfaces (37).
10. Flat bed embossing machine according to claim 1, characterised in that the suction channels (16, 17) in the web guides (11) form a central zone and symmetrical edge zones.
11. Flat bed embossing machine according to claim 10, characterised in that the web guides comprise a central suction channel (16) and two adjoining lateral suction channels (17) connected together, which through a leakage air control valve (18) are connected with the negative pressure sources (13i).
12. Flat bed embossing machine according to claim 1, characterised in that over the whole length of the foil web guiding from the unwinding rolls (7) up to the tool plate (3) there are no guiding elements on the image layer side (6a) of the foil webs.
13. Flat bed embossing machine according to claim 1, characterised by a vacuum loop store (20) ahead of the web guides (11).
14. Flat bed embossing machine according to claim 1, characterised in that the lateral guiding elements (30) are connected together, that their spacing is adjustable to the width of the foil web foil (b1) and that they are adjustable together in transverse direction (Y).
15. Flat bed embossing machine according to claim 1, characterised in that the controllable negative pressure sources (13i) are designed as controllable vacuum controllers (22i), which are connected with a central suction fan (23).
16. Flat bed embossing machine according to claim 15, characterised in that every controllable negative pressure source (13i) is connected with a rapid switching vacuum valve (24i), which also comprises a connection to the central suction fan (23).
17. Flat bed embossing machine according to claim 1, characterised by a controlling of the foil drawing, with which the picture foil webs (6i) after the detection of the print marks (27) by the print mark sensors (15i) are slowly braked and wherein shortly before the standstill of the picture foil webs the negative pressure (pi) in the web guides (11i) is rapidly increased.
18. Flat bed embossing machine according to claim 1, characterised in that after the web guides (11i) foil web tension sensors (40i) are arranged for determining the foil tensions and wherein the control of the negative pressure sources (13i) can be executed as a controlling to a settable desired value of the foil tension (zi) or of the foil strain (ee).
19. Flat bed embossing machine according to claim 1, characterised in that under the web guides (11i) additionally a short and wide braking - and guiding wall (10) is arranged as foil tensioning device for the simultaneous embossing with several picture foil webs (6.1, 6.2) and with dye foil webs (6.11, 6.12).

Images