EP1593503A2 - Foil guiding device for a flat foil printing machine - Google Patents

Abstract

The flat film embossing machine (1) draws film webs (6) from rolls (7), to be carried over a flat embossing table (3). A brake and guide wall (10) is in front of the embossing station, and film advance units (9) are after it. The wall has a carrier surface layer (11) to support an air permeable fabric laying layer (12) together with a flat underpressure chamber (17) and an adjustable underpressure source (13). The action forces the film against the wall and brakes its movement to give a controlled passage through the embossing station.

Description

The invention relates to a film web guide for a flat embossing machine with film webs, which are guided by unwinding rollers on an embossing table according to the preamble of claim 1. With such flat embossing machines particularly high embossing performances in the best quality and for particularly demanding embossing tasks such as relief embossing can be performed. 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 of the film webs depending on the embossing order) at the same time smoothly smoothly guided and promoted. The film guide must be perfectly smooth and accurately positioned without distortion, hull formation, wrinkles and dislocations flat. And the quick, intermittent advantage over the entire embossing table in a short time must be performed optimally gentle, in order to achieve high performance and quality. Such a flat embossing printing press and film web guide is known, for example, from EP 0 858 888. The film web guide has before the embossing table to a tensioning roller, in which necessarily two deflection rollers on the embossing layer side of the film webs are required, which can affect the sensitive embossing layer. Moreover, the tensile stresses for several film webs are limited and relatively complex individually adjustable here. The necessary set-up and changeover times for several film webs are still relatively high.

It is therefore an object of the present invention to provide a simpler and improved gentle film web guide for flat embossing machines, which also allows optimal adjustment of the individual tensile stresses of several film webs, which facilitates the setup and retooling of multiple film webs and which also no contact with guide elements on the sensitive preshaped side (image side) of the film webs required.
This object is achieved according to the invention by a film web guide for a flat embossing printing machine with at least one flat braking and guide wall as film tensioning device in front of the embossing table according to claim 1.
The dependent claims relate to advantageous developments of the invention with further improvements of the film web guide and thus also the machine performance as well as with respect to the shortening of set-up and changeover times.

Fig. 1

schematisch eine erfindungsgemässe Folienbahnführung in einer Flachprägedruckmaschine mit flachen Brems- und Führungswänden als Folienspanneinrichtung,

Fig. 2a

im Querschnitt eine Brems- und Führungswand mit einer festen Trägerschicht mit Absaugöffnungen, einer luftdurchlässigen Auflageschicht, einer flachen Unterdruckkammer und einer Unterdruckquelle,

Fig. 2b

eine Trägerschicht mit Schlitzen in Längsrichtung,

Fig. 3

ein weiteres Beispiel einer Brems- und Führungswand im Längsschnitt,

Fig. 4

eine Brems- und Führungswand mit luftundurchlässigen Abdeckungen unter den Folienbahnen,

Fig. 5

perspektivisch eine Einschubkassette für einen Vakuumschlaufenspeicher,

Fig. 6

im Grundriss eine Einschubkassette mit Seitenwänden und Abschlusswänden,

Fig. 7a, b

eine belüftete Umlenkstange mit Seitenführungselementen,

Fig. 8

einen Folienvorzug in Querrichtung, welcher aus der Längsrichtung umgelenkt ist,

Fig. 9

einen Folienvorzug in Längsrichtung, welcher aus der Querrichtung umgelenkt ist.

In the following the invention will be further explained by means of examples and figures, in which:

Fig. 1

1 schematically shows a film web guide according to the invention in a flat embossing printing press with flat braking and guide walls as film tensioning device,

Fig. 2a

a brake and guide wall in cross-section with a solid support layer with suction openings, an air-permeable support layer, a flat vacuum chamber and a vacuum source,

Fig. 2b

a carrier layer with slots in the longitudinal direction,

Fig. 3

another example of a braking and guiding wall in longitudinal section,

Fig. 4

a braking and guiding wall with air-impermeable covers under the film webs,

Fig. 5

in perspective a slide-in cassette for a vacuum loop store,

Fig. 6

in outline a slide-in cassette with side walls and end walls,

Fig. 7a, b

a ventilated deflecting bar with side guiding elements,

Fig. 8

a film advantage in the transverse direction, which is deflected from the longitudinal direction,

Fig. 9

a film advantage in the longitudinal direction, which is deflected from the transverse direction.

Fig. 1 shows an inventive film web guide 2 for a flat embossing machine 1 with a flatbed press 4, wherein film webs 6 of unwinding rollers. 7 be led to an embossing table 3 for embossing flat material 5. Das Sheet 5 may consist of paper sheets or paper webs from rolls. The sheet is moved in the machine longitudinal direction X. In addition, you can also film webs in the transverse direction Y are drawn onto the embossing table 3 (Fig. 8). The film web guide 2 has a film tensioning device in front of the embossing table and Film feed devices 9.1, 9.2 for several film webs 6.1, 6.2 after the Embossing table 3 on. Between the unwinding rollers 7 and the embossing table 3 is at least a flat brake and guide wall 10 is provided as a film tensioning device, over which the film webs 6 are guided. This brake and Guide walls 10 have a solid support layer 11 which a support and Guide surface forms, with suction openings 14 and a lying on the Carrier layer 11 fixed, cloth-like, air-permeable support layer 12 and a associated, adjustable negative pressure source 13, wherein in a flat vacuum chamber 17 a negative pressure dp is generated. So the film webs are easy on pressed the support layer and thus guided and braked adjustable. The flat brake and guide walls 10 may also be slightly bent and thus additionally result in a deflection of the film webs 6 (in FIG Brake and guide wall 10.1 a slight bend in the direction of embossing point. 3 exhibit). The structure and operation of the brake and guide walls 10th are further explained to Figs. 2-4.

Preferably, a braking and guide wall 10.1 is arranged directly in front of the embossing table 3 with which for each film web 6.1, 6.2 individually set an optimal tension for the embossing process, so that in particular all film webs 6 again solved properly after embossing of the embossed sheet 5 and can be dissipated. The required release stresses depend on the type and dimension of the film webs and the embossing process (different embossing surfaces and embossing, eg relief embossing).
Thanks to the space-saving, flat design of the inventive brake and guide walls 10.1 additional unwinding 7.3 can be mounted here for additional film webs 6.3 or even for simple smaller embossing orders (which do not require a film storage) directly in front of this braking and guide wall 10.1, which here particularly quickly and easily can be set up. Also, a film roll change is quickly possible by the new film web is simply glued to the brake and guide wall 10.1 to the old.

On the long path of the film web guide 2 from the unwinding rollers 7 to the Embossing table 3 can also be arranged more than one braking and guiding wall 10 become. In the example of Fig. 1 is an additional brake and guide wall 10.2 mounted shortly after a film storage 20. The foil stores are here as Vacuum loop storage, especially as a horizontal vacuum double-loop storage 20 formed and in the film web feed, i. in front of the embossing table 3, arranged. By the vacuum loop memory 20 is a first tension Z1 generated in the film webs 6.

For the brake and guide wall 10.2, a vacuum blower 21 of the loop memory 20 can be used here as a vacuum source 13. The negative pressure dp2 in a vacuum chamber 17 can be additionally adjusted, for example by means of a variable throttle point 19. The usually relatively moderate additional tensile stress Z2, which is generated by this braking and guide wall 10.2, is adjusted so that a properly stretched film web guide is achieved until the next brake and guide wall 10.1. The additional tensile stresses Z3 (see FIG. 4) on the braking and guide wall 10.1 can be set individually for each film web 6.1, 6.2, 6.3 in such a way that optimum positioning on the embossment 3 and proper detachment of the film webs 6 from the embossed flat material 5 is achieved after embossing.
In the example of FIG. 1, the film web guide has a film removal device 29 downstream of the film feed devices 9.1, 9.2 for the lateral removal of the distinct film webs 6.1, 6.2. This in turn free much space, which can be used for additional unwinding.
The adjustment of the braking forces or the tensile stresses in the film webs on the vacuum loop memory (Z1) and on the braking and guide walls (Z2, Z3) can be coordinated so that the detachment of the film webs from the embossed sheet 5 after embossing and the film web guide over the whole length is flawless and optimized.

At the embossing table 3 is here in the film webs a total tension
Z = Z1 + Z2 + Z3 generated. Due to the forced, precisely positioned and very rapid film preference by means of the film feed devices 9.1, 9.2, a tensile stress Z4 is generated, which must correspond to at least the total tensile stress Z. The stress of the pronounced film webs on the film feed devices 9 with deflecting rollers, which must necessarily also touch the stamping page 6a of the film webs, is substantially higher than on the flat braking and guide walls 10, where no guide elements and no contact on the stamping page 6a are required. In the example of FIG. 1, the embossing page 6a is not contacted all the way from the unwinding rollers 7 to the embossing table 3.
The required negative pressure dp at the large-area brake and guide walls 10 is correspondingly relatively small and is for example 500 - 2000 Pa and the generated total tensile stress Z in the very thin film webs 6 is for example as possible less than 5 N / cm film web width.

For better film web guidance in particularly demanding embossing tasks (e.g. for relief embossing) with a correspondingly high required tensile stress Z, the positioned film webs 6 on the embossing table 3 before stamping by short Reversing the film feed devices 9 partially relaxed, then embossed and then pulled away again with full tensile stress Z. and thereby detached from the embossed sheet 5 with high tension become. For this purpose, the film feed devices 9 can be used e.g. by 2 - 5 mm backwards drive and thereby reduce the tensile stress Z during the embossing.

Figs. 2a and 2b illustrate the structure and operation of the brake and Fig. 2a shows in cross section a brake and guide wall 10th with a solid support layer 11 (which forms a support and guide surface) with Suction openings 14 and a flat vacuum chamber 17, in which a Vacuum dp is generated by means of an adjustable vacuum source 13. On the Carrier layer 11 is a cloth-like, air-permeable support layer 12 is attached and fixed, e.g. clamped all around. The overlay layer is mainly in tangential direction 18 permeable to air, so that the negative pressure dp under a over ongoing film web 6 balanced or uniform over the surface is distributed. The film webs are thus uniform and relatively low Pressed contact pressure on the large-scale support layer 12, thereby braked and uniform and constant in the preferred direction or direction of movement v of Led film webs. The overlay layer 12 consists of a non-electrostatic rechargeable soft material, so no electrostatic friction forces can arise between the film web and support layer. The overlay layer 12 can be made of natural fibers such as cotton (with a minimal electrical Conductivity) and as a nonwoven fabric or as a textile structure such as tissue, Knitted or crocheted or as felt and with intermediate spaces, so that a desired tangential air permeability (18) is generated. With this Pad layer 12 can achieve a substantially constant coefficient of friction be, with static friction and sliding friction barely differ.

The layer thicknesses of this overlay layer 12 may be e.g. 0.3-1 mm; ever depending on the type and geometry of the wings and the overlay layer whose thickness also more, e.g. to 3 mm. This overlay can be easily interchangeable be attached to the carrier layer 11 and thus to adapt to the nature of Film webs also be easily replaced.

FIG. 2b shows a plan view of an example of a preferably metallic carrier layer 11 with suction openings 14, which has an open surface portion of preferably 30 - 60% of the entire surface of the braking and guiding wall 10 form and which has an average diameter of e.g. 1 - 5 mm. Fig. 2b shows an advantageous embodiment of the carrier layer 11 as a slot wall with Slits which extend parallel to the preferred direction v of the film webs 6 and which allow a particularly good leadership. The slot width as well as the Distance between the slots may e.g. 1 - 3 mm and the slot length e.g. 10 - 30 mm. Other forms of the suction openings 14 are possible, e.g. as a perforated plate with a small hole diameter, so that the film webs 6 in essentially flat over it.

Fig. 3 shows an example of a braking and guide wall 10 in section along the Film movement direction v with a length L, which is at least 20 cm, preferably rather more, e.g. 30 - 50 cm. Fig. 3 also illustrates the very flat Construction of the brake and guide walls 10 along the film web 6, whereby in Compared to previous clamping and guiding devices much less Space is needed, which is e.g. for additional unwinding rolls (7.3 in Fig. 1) Creates space.

Fig. 4 shows an example of a braking and guiding wall 10 with three running over it Film webs 6.1, 6.2, 6.3 and with air-impermeable covers 15.1, 15.2 under a part of the film webs, so that only the uncovered part L1, L2, L3 of length L is exhausted and corresponding proportional braking forces or tensile stresses Z3.1, Z3.2, Z3.3 are generated in the film webs. In this example will be less with the cover 15.1, with 15.2 stronger and lower the film web 6.3 not covered. The desired optimum braking force or Tensile Zi can thus here for each foil web individually - and practically between 0 and 100% - very easy to set.

Between the film webs 6.1, 6.2, 6.3 also airtight covers 16 can be attached to here to avoid a pressure drop or a pressure loss and to set an optimal uniform distribution of the negative pressure dp at the brake and guide wall 10.
The air-impermeable covers 15 and 16 can for example be cut very easily from paper sheets and fixed to the front edge 10a of the brake and guide wall.

The brake and guide walls, i. the carrier layers 11 with the support layers 12, are preferably formed easily replaceable or insertable. So they can be easily removed, the covers 15, 16 on it new set and the layers 11 and 12 are used again, without the film webs to move or to set up new ones. That is possible because of the Brake and guide walls 10 no pulleys on the Prägeschichtseite 6a the film webs are present and needed.

Figs. 5 and 6 show examples of drawer cassettes 22 for vacuum loop storage 20, which are shown in Fig. 1. Fig. 5 shows a perspective Representation and Fig. 6 in plan a division with partitions and End walls of a slide-in cassette 22. A film web guide 2 with brake and Guide walls 10 and combined with vacuum loops 20 enables a particularly good film web guidance and conveying. To the film web guide with optimal tensile stresses to further improve and around the Removal and changeover times can be significantly reduced, removable Insertion cassettes 22 are inserted into the vacuum loop memories 20. At Frame bars 25 here adjustable partitions 23 are fixed so that the desired film webs are separated. The intermediate walls 23 are closed at the bottom by end walls 24, which separated, not aspirated Chambers 26 between and adjacent to the film webs 6.1, 6.2 in the film loop storage 20 are formed. Thus, on the one hand, a pressure loss between the Film webs avoided and on the other hand, the film webs a uniform, optimally adjustable suction force Z1 exerted in the vacuum loop storage. With these slide-in cassettes 22, the optimal setting and conversion of the Partitions are carried out very quickly without removing the film webs 6 to have (only the film loops are from the vacuum loop storage pulled out). The film webs do not need to be re-set up.

The inventive braking and guide walls 10 in flatbed embossing machines and the drawer cassettes 22 in the vacuum loop memories 20 allow much shorter set-up and changeover times, improved Film web guidance, higher embossing performances and an extended range of Embossing tasks. With ventilated deflection rods can be further improvements be achieved.

FIGS. 7a, 7b show a deflecting element 27 for deflecting the film webs 6 in FIG Form of a standing ventilated deflection bar 30, which is an air cushion under the Sheets 6 generated so that they are deflected with minimal friction. With side guide elements 32, the film web on the air cushion can be very be exactly guided and stabilized. This results in comparison to previous ones Deflection elements 27, e.g. in the form of roller axes, minimal frictional forces and a better guidance of the film web. Advantageously, such ventilated deflection rods 30, as shown in Fig. 1, e.g. in front of a rear brake wall 10.1, before and after the embossing point 3, at the entrance of the vacuum loop memory 20 and also at Foil preference in the transverse direction Y (see FIG. 8) to be arranged on the embossing point 3. In principle, all deflecting elements can be designed as ventilated deflection rods become. The side guide members 32 may be e.g. as slip-on elements (clips) be made of Delrin and simply attached to the standing Umlenkstange 30 and also moved and adjusted. The vented deflection rods 30 can e.g. from a slightly positive pressure ventilated tube with a microporous Layer 31 exist which a finely distributed air cushion under the film web. 6 generated. This air cushion must be generated only in the deflection 34.

The inventive film web guide with braking and guide walls 10 and with ventilated deflection rods or air cushion axes 30 also allows the Film web guide by means of ventilated 90 ° -Umlenkstangen 33 from the machine direction X in the transverse direction Y or vice versa from the transverse direction Y in the Redirecting the longitudinal direction X, as shown in Fig. 8 and 9 is shown. Slide benefits with Unwinding rollers in the longitudinal direction X and in the transverse direction Y are known and e.g. in EP 0 858 888.

Fig. 8 shows an example with a film advantage 6y in the transverse direction Y with a Brake wall 10y in the transverse direction Y and with ventilated deflection rods 30 with Side guide elements 32 before and after the embossing 3. This is especially advantageous because the film web 6y after the embossing of the machine in the longitudinal direction X moving sheet 5 must be replaced transversely to and should not be moved. The unwinding roll 7 and the vacuum loop stores 20 form here a film preference in the longitudinal direction X. By means of a vented 90 ° deflecting rod 33, however, (single) film webs 6 in the Transverse direction Y (as film web 6y) are deflected (while other film webs 6 are continued simultaneously in the longitudinal direction of the embossing point 3). Thus, here no additional unwinding rollers 7 and no vacuum loop storage 20 needed in the transverse direction. The 90 ° deflection rods 33 are in an angle of 45 ° to the X and Y direction.

As shown in Fig. 9, conversely, film advantages in the transverse direction Y with unwinding rollers 7y and loop memories 20y in the transverse direction by means of a vented 90 ° -Umlenkstange 33 are deflected in the longitudinal direction X. In order to can also have a separate unwinding with unwinding 7y and loop memories 20y and braking walls 10y placed in the transverse direction next to the machine which is not limited by the chain run of the machine. The example of Fig. 9 further shows a splice device 35, which between the unwinding rollers 7 and the vacuum loop memory 10 is arranged (Fig. 1). With a Such a splice station can be connected to an outgoing film web a new film web attached, e.g. by gluing, welding or Connect with adhesive tape.

1

Flachprägedruckmaschine, Flachbett-Prägedruckmaschine

2

Folienbahnführung

3

Prägetisch, Prägestelle

4

Flachbettpresse

5

Flachmaterial

6

Folienbahnen

6a

Prägeschichtseite von 6

7

Abwickelrollen

9

Folienvorschubeinrichtung

10

Brems- und Führungswand

10a

Vorderkante von 10

11

Trägerschicht, Trag- und Führungsfläche

12

tuchartige, luftdurchlässige Auflageschicht

13

Unterdruckquelle, Sauggebläse

14

Absaugöffnungen

15

Abdeckungen unter 6

16

Abdeckungen zwischen 6

17

flache Unterdruckkammern

18

tangentiale Richtung zu 12

19

Drosselstelle

20

Vakuumschlaufenspeicher, Folienspeicher

21

Vakuumquelle, Sauggebläse

22

Einschubkassette

23

Zwischenwände

24

Abschlusswände

25

Rahmenstangen

26

abgetrennte Kammern

27

Umlenkelemente

29

Folienabzugsvorrichtung

30

belüftete Umlenkstangen, Luftpolsterachsen

31

mikroporöse Schicht

32

Seitenführungselemente (Clips)

33

90°-Umlenkstange

34

Umlenkbereich

35

Spleisseinrichtung

L

Länge von 10

L1, L2, L3

offene Teillängen

Z

Bremskräfte, Zugspannungen

dp

Unterdruck in 10

v

Vorzugsrichtung von 6

X

Längsrichtung, Maschinenlaufrichtung

Y

Querrichtung

The following terms are used in this description:

1

Flat embossing machine, flatbed embossing machine

2

Sheet guide

3

Embossing table, embossing point

4

Flatbed Press

5

flat material

6

film webs

6a

Preprint page of 6

7

unwinding

9

Sheet feeder

10

Brake and guide wall

10a

Leading edge of 10

11

Carrier layer, supporting and guiding surface

12

cloth-like, air-permeable coating layer

13

Vacuum source, suction fan

14

suction

15

Covers under 6

16

Covers between 6

17

flat vacuum chambers

18

tangential direction to 12

19

restriction

20

Vacuum loop storage, film storage

21

Vacuum source, suction fan

22

plug-in unit

23

partitions

24

end walls

25

frame bars

26

separated chambers

27

deflecting

29

Film takeaway

30

ventilated deflection rods, air cushion axles

31

microporous layer

32

Side guide elements (clips)

33

90 ° -Umlenkstange

34

deflection

35

splicing

L

Length of 10

L1, L2, L3

open part lengths

Z

Braking forces, tensile stresses

dp

Negative pressure in 10

v

Preferred direction of 6

X

Longitudinal direction, machine direction

Y

transversely

Claims (25)

Film web guide (2) for a flat embossing machine (1) with film webs (6), which are guided by unwinding rollers (7) via an embossing table (3), with a film tensioning device in front of the embossing table and with film feed devices (9) for several film webs after the embossing table, characterized in that between the unwinding rollers (7) and the embossing table (3) at least one flat braking and guide wall (10) is provided as a film tensioning device, over which the film webs (6) are guided and which a solid support layer (11) with suction (14) and a lying on the carrier layer (11) fixed, cloth-like, air-permeable support layer (12) and an associated, adjustable vacuum source (13). Film web guide according to claim 1, characterized in that a braking and guide wall (10.1) is arranged directly in front of the embossing table (3). Film web guide according to claim 2, characterized in that additional unwinding rollers (7.3) are arranged directly in front of the braking and guide wall (10.1) in front of the embossing table. Film web guide according to claim 1, characterized in that more than one brake and guide wall is provided, wherein an additional brake and guide wall (10.2) is arranged shortly after a film storage (20). Film web guide according to claim 1, characterized in that the length L of the braking and guide wall (10) is at least 20 cm. Film web guide according to claim 1, characterized by a metallic carrier layer (11) with suction openings (14) which have an average diameter of 2 - 5 mm and a surface portion of the suction openings of 30 - 60%. Film web guide according to claim 1, characterized in that the carrier layer (11) is formed as a slot wall with slots in the preferred direction (v) of the film webs and with a slot width of 1 - 3 mm. Film web guide according to claim 1, characterized in that the support layer (12) is not electrostatically chargeable and in the tangential direction (18) is permeable to air. Film web guide according to claim 1, characterized in that the support layer (12) has a layer thickness of 0.3 - 3 mm and is interchangeably mounted on the carrier layer (11). Film web guide according to claim 1, characterized in that on the brake and guide wall (10) air-impermeable covers (15.1, 15.2) over part of the length L under the film webs (6.1, 6.2) for individual adjustment of the braking forces (Z3.1 , Z3.2) are provided or that air-impermeable covers (16) between the film webs (6.1, 6.2, 6.3) are provided. Film web guide according to claim 1, characterized in that over the entire length of the film guide to the embossing table (3) no guide elements on the embossing layer side (6a) of the film webs are present. Film web guide according to claim 1, characterized in that the braking and guide wall (10) is designed to be insertable or replaceable. Film web guide according to claim 1, characterized by a vacuum accumulator (20) in front of the embossing table (3). Film web guide according to claim 13, characterized by a vacuum double-loop memory (20) and an overlying brake and guide wall (10.2) with a common vacuum blower (21). Film web guide according to claim 1, characterized by a vacuum accumulator (20) with a removable slide-in cassette (22) with adjustable partitions (23) and lower end walls (24), which form not extracted chambers (26) between the film webs (6.1, 6.2) , Film web guide according to claim 1, characterized by a film removal device (29) downstream of the film feed devices (9) for the lateral removal of the distinct film webs (6.1, 6.2). Film web guide according to claim 1, characterized by adjustable, coordinated braking forces and tensile stresses (Z1, Z2, Z3) in the film webs (6) on the vacuum belt store (Z1) and on the brake and guide walls (Z2, Z3). Film web guide according to claim 1, characterized in that the positioned film webs (6) on the embossing table (3) before embossing by reversing the film feed devices (9) partially relaxed, then embossed and then pulled back with full tension (Z). Film web guide according to claim 1, characterized in that ventilated deflection rods (30) are provided with or without lateral guide elements (32). Film web guide according to claim 1, characterized in that in addition a film advantage (6y) in the transverse direction (Y) with a braking and guide wall (10y) is provided in the transverse direction. Film web guide according to claim 1, characterized in that a film advantage (6y) is provided in the transverse direction (Y) with a vacuum loop memory (20y) in the transverse direction. Film web guide according to claim 1, characterized by a film advantage (6y) in the transverse direction (Y), which is deflected by a ventilated 90 ° deflecting rod (33) in the longitudinal direction (X). Film web guide according to claim 1, characterized by a film advantage (6) with a vacuum loop store (20) in the longitudinal direction (X), which is deflected by means of a ventilated 90 ° -Umlenkstange (33) in the transverse direction (Y). Film web guide according to claim 1, characterized in that a splicing device (35) is arranged between the unwinding rolls (7) and a vacuum loop store (20). Flat embossing machine with a film web guide (2) and with at least one brake and guide wall (10) according to one of preceding claims.

Images