EP3196021A1 - Hot foil stamping device - Google Patents

Abstract

The invention relates to a device (100) for hot foil stamping on substrates (1000) with a heated embossing cylinder (1), an impression cylinder (2) and a device (3) for providing embossing film (1001), wherein the stamping foil (1001) is guided by the device (3) for providing tangential to the embossing cylinder (1) and to the counter embossing cylinder (2) between them. According to the invention, the device (3) for providing stamping foil (1001) downstream of the embossing cylinder (1) and the countermolding cylinder (2) has an adjustable guide element (4) on which the stamping foil (1001) is guided. Such a device for hot foil stamping advantageously makes it possible to optimize the stamping quality.

Description

The invention relates to a device for hot foil stamping according to the preamble of claim 1.

State of the art

One of the known types of finishing in the printing industry is, inter alia, the other so-called hot foil stamping.

Mirror-smooth surface elements in gold, silver, copper, aluminum and other metallic colors can be transferred to the substrate in hot foil stamping. A carrier film is coated with the coloring layer and a hot-melt adhesive (adhesive layer). Under pressure and heat, the image can be transferred with a heated cliché (high-pressure mold). Suitable machines are either rotary processing stations in printing machines or flat bed punching and embossing machines. Hot foil stamping is primarily used in a wide range of sheetfed and roll products, such as packaging for cosmetics, confectionery and beverages, as well as for high quality brochures.

In the DE 10 2009 019 590 A1 a rotary hot foil stamping station is described and shown in its FIG.

Adhesion forces prevail in the embossing gap between embossing cylinder and counter embossing cylinder when the film is released from the printing substrate. Contrary to these adhesion forces, the foil must be loosened after embossing. The difficulty is that the embossing motif retains a sharp edge and does not "fray", ie that it has a high edge sharpness.

task

Object of the present invention is to provide a device for hot foil stamping, which allows optimization of the embossing quality.

This object is achieved by a device for hot foil stamping with the features of claim 1.

The device according to the invention is used for hot foil stamping on sheet-shaped or web-shaped substrates with a heated embossing cylinder, a cooperating with this impression cylinder and a device for providing embossing film. The embossing foil is thereby guided by the device for providing tangential to the embossing cylinder and tangentially to the counter embossing cylinder between these two, that is, without wrapping with only or partial wrap in an angular range of the embossing cylinder or the counter-embossing cylinder. According to the invention, the means for providing embossing foil downstream and spaced from the embossing cylinder and the countermolding cylinder at least one adjustable guide element, for. B. adjustable guide rollers or an adjustable guide roller on which the stamping foil is guided. The guide element could thus also be referred to as deflecting element. It can be z. B. either a continuous guide roller or more juxtaposed on a rotary axis guide rollers are used. The guide element is arranged on the side of the device for providing embossing film relative to the transport plane of the substrates. Preferably, both are arranged above the transport plane of the substrates. To adjust the guide element, an adjustment is provided. As a result, the dwell time of the stamping foils on the printing material can be advantageously adjusted and thus the stamping quality can be optimized. In a particularly advantageous embodiment, the adjustment of the position of the guide element causes a change in the take-off angle α between the substrate and the embossing film.

In a particularly advantageous and therefore preferred embodiment of the device according to the invention, the guide element is designed to pivot about an axis of rotation for carrying out the adjustment movement. Alternatively, the guide element along be designed to be displaceable in a linear axis, for example horizontally, vertically or transversely, in each case for carrying out the adjusting movement.

It is particularly advantageous if the device for providing embossing foil has an actuator, in particular an electric motor, for example a servomotor, for carrying out the adjusting movement. Alternatively, the adjustment can be done manually by a machine operator.

It is advantageous if the actuator can be controlled by a control unit and is controlled by it, for example, depending on a processing speed. In an advantageous embodiment, job-dependent setting data, that is to say setting data relating to the position of the guide element, can be stored in a memory of the control unit, so that the setting data can be recalled quickly in the case of a repeat job.

Also, speed-dependent adjustment data of the guide element can be stored in a memory of the control unit and retrievable.

The invention described and the described advantageous developments of the invention are also in combination with each other - as far as is technically feasible - advantageous developments of the invention.

With regard to further advantages and constructive and functional advantageous embodiments of the invention, reference is made to the dependent claims and the description of exemplary embodiments with reference to the accompanying figures.

embodiment

The invention will be explained in more detail with reference to attached figures. Corresponding elements and components are provided in the figures with the same reference numerals. In favor of a better clarity of the figures was waived a true to scale representation.

Fig. 1 a - c

eine erfindungsgemäße Vorrichtung zum Heißfolienprägen mit unterschiedlichem Abzugswinkel der Folie

Fig. 2

eine Variante der Vorrichtung zum Heißfolienprägen mit motorischer Verstellung

Fig. 3

eine Variante der Vorrichtung zum Heißfolienprägen mit alternativer Verstellung

Fig. 4

Varianten des Leitelements

It show in a schematic representation

Fig. 1 a - c

an inventive device for hot foil stamping with different deduction angle of the film

Fig. 2

a variant of the device for hot foil stamping with motorized adjustment

Fig. 3

a variant of the device for hot foil stamping with alternative adjustment

Fig. 4

Variants of the guide element

In the figures, a device for hot foil stamping 100, a so-called hot foil stampers, is shown. By means of a device 3 for providing embossing foil 1001, the embossing foil 1001 is transported through the embossing gap between the cylinders 1, 2 through the embossing cylinder 1 and an embossing cylinder 1 cooperating therewith. The printing substrate 1000 is also transported through the embossing gap between the cylinders 1, 2 in the transporting direction T therethrough. At least on the material-expiring side of the embossing gap of the substrate 1000 is guided tangentially to embossing cylinder 1 and 2 impression cylinder. In the embossing gap, color and / or metal particles are transferred from the embossing foil 1001 to the printing substrate 1000. The embossing cylinder 1 can wear an embossing cliché (not shown) and have a heater for heating this embossing cliché (not shown).
The device 3 for providing embossing foil 1001 has an adjusting unit 10 for carrying out an adjusting movement v, v ', v "of the guide rollers 4 or of the guide roller 4.

In the Figures 1a, 1b and 1c gives the device 3 for providing embossing foils 1001 different deduction angle α, wherein the deduction angle α between the guide rollers 4 and guide roller 4 along ongoing embossing film 1001 and the transport plane of the printing material 1000 is. The change in the take-off angle α is achieved in that guide rollers 4 and a guide roller 4 of the device 3 for providing embossing foil, which guides the embossing foil 1001, by means of a rotating shaft 6 about a rotation axis 5 with a lever 7 designed as a pivot lever is designed to be pivotable. The pivoting adjustment v changes the position of the contact point of the guide rollers 4 and the guide roller 4 with the stamping foil 1001, thus changing the deduction angle α and the contact area k of substrate 1000 and stamping 1001. By changing these parameters, the embossing quality can be influenced and optimized.

As in FIG. 2 indicated, the means 3 for providing embossing foil 1001 of the hot foil stamping machine 100 can have an electric motor 8, which serves for the adjusting movement v of the guide rollers 4 or the guide roller 4. The electric motor 8 is controlled by a control unit 9, in which also setting data can be stored.

In FIG. 2 is also the device 11 for transporting the printing material 1000 indicated.

In the in FIG. 3 The embodiment of the adjusting unit 10 of the guide rollers 4 and the guide roller 4 has been modified: Instead of the pivoting movement v either a vertical adjustment v 'or a horizontal adjustment v' of the guide rollers 4 and the guide roller 4 is provided.

In FIG. 4 Alternative embodiments of the guide element 4 are shown.

LIST OF REFERENCE NUMBERS

1

embossing cylinders

2

Against embossing cylinders

3

Device for providing embossing foil

4

Guide element, z. B. guide rollers / guide roller

5

axis of rotation

6

rotary shaft

7

rotating arm

8th

electric motor

9

control unit

10

Adjustment unit of the guide rollers / guide roller

11

Device for transporting the printing material

100

Hot foil embosser

1000

substrate

1001

stamping foil

k

Contact area of substrate and stamping foil

v

adjustment

v '

alternative adjustment movement

v "

alternative adjustment movement

T

transport direction

α

peel angle

Claims (8)

Device (100) for hot foil stamping on flat substrates (1000) with a heated embossing cylinder (1), an impression cylinder (2), a device (11) for transporting the printing material (1000) and a device (3) for providing embossing film (1001 )
wherein the embossing foil (1001) is guided by the device (3) for providing tangential to the embossing cylinder (1) and to the counter embossing cylinder (2) between them,
characterized,
that the means (3) for providing embossing sheet (1001) downstream from the embossing cylinder (1) and the counter-impression cylinder (2) at least one adjustable guide element (4), on which the embossing foil (1001) is guided, and
that the adjustment (v, v '; v ") of the position of the guide element (4) a change of the trigger angle (α) between the printing material (1000) and the embossing foil (1001) effected. Hot foil stamping apparatus according to claim 1,
characterized,
that the guiding element (4) about an axis of rotation (5) is made pivotable. Hot foil stamping apparatus according to claim 1,
characterized,
that the guiding element (4) along a linear axis displaceable (v ', v') is executed. Hot foil stamping device according to one of the preceding claims,
characterized,
that the means (3) for providing embossing film (1001) having an actuator (8), in particular an electric motor, for execution of the adjustment movement (v, v ', v "). Hot foil stamping apparatus according to claim 4,
characterized,
that the actuator (8) by a control unit (9) is controllable. Hot foil stamping apparatus according to claim 5,
characterized,
that job-dependent setting data of the guide element (4) can be stored in a memory of the control unit (9). A hot foil stamping apparatus according to claim 5 or 6,
characterized,
that speed-dependent setting data of the guide element (4) are stored in a memory of the control unit (9) and can be called up. Hot foil stamping device according to one of the preceding claims,
characterized,
that the guide element (4) is designed as a guide roller, guide roller or round brush or as a fixed profile part, namely as baffle, guide brush, Leitkissen or air cushion roller.

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