AT523951A1 - PROCEDURE FOR ENGRAVING AN INTAGLIO GRAPHIC PLATE - Google Patents

Abstract

In a method for engraving an intaglio intaglio printing plate (1), in which a depth profile (2) of the intaglio intaglio printing plate (1) is produced by engraving at least one engraved layer (4, 5, 6, 7), it is proposed that at least one area the depth profile (2) of the intaglio intaglio printing plate (1) is provided with a micro-corrugation (9, 10) to produce an ink retention topography, the micro-corrugation (9, 10) being created by engraving essentially parallel lines with a predetermined first line spacing (11) is produced.

Description

1

The invention relates to a method for engraving an intaglio

Intaglio printing plate according to the preamble of patent claim 1.

Methods for producing an intaglio intaglio printing plate are known, the intaglio intaglio printing plate being engraved directly by means of a laser or graver. Engraving methods that use direct ablation by means of a laser are also referred to as Direct Laser Engraving (DLE). The surface of the intaglio printing plate blank is scanned in several layers by the laser in order to remove the surface layer by layer. This means that complex three-dimensional depth profiles can also be produced for intaglio intaglio printing. Here, several two-dimensional engraving layers are generated from a three-dimensional depth profile, which one after the other

be removed.

The disadvantage of this is that if, after the intaglio printing ink has been applied to the intaglio intaglio printing plate, the latter is wiped off in order to remove excess intaglio printing ink, intaglio printing ink is also unintentionally removed from the three-dimensional depth profile. This leads to one

Loss of quality of the print result.

The object of the invention is therefore to provide a method of the type mentioned above, with which the disadvantages mentioned can be avoided, with which an intaglio intaglio printing plate for a high-quality

Intaglio printing can be easily produced. According to the invention, this is achieved by the features of patent claim 1.

This has the advantage that, due to the micro-corrugation, the intaglio printing ink is held better during the wiping step in engraving sections running in the wiping direction. From a topographical point of view, the micro-corrugation during wiping avoids excessive ink removal from, in particular larger, connected areas, for example from a depression, of the intaglio intaglio printing plate. Thus, the color application of lines lengthwise and crosswise to the wiping direction is more similar, because engraving lines or

Engraved areas along the wiping direction use less intaglio ink

2

is wiped out. Due to the particularly planar micro-corrugation in the depth profile or over the engraved areas, no individual separating webs or further additional design elements have to be arranged in order to obtain the ink-retaining topography. By engraving the microcorrugation using substantially parallel lines with a predetermined first line spacing, good ink retention on the intaglio intaglio printing plate during

wiping step can be produced easily and without additional design effort.

There is also an intaglio intaglio printing plate with a micro-corrugation

trained color retention topography provided.

The object of the invention is therefore to specify an intaglio intaglio printing plate of the type mentioned at the outset, with which the disadvantages mentioned can be avoided and with which the quality of the intaglio intaglio printing can be improved

can. According to the invention, this is achieved by the features of patent claim 7 .

The advantages of the intaglio intaglio printing plate correspond to the advantages of the

procedure.

It is also a method for printing a security feature with the

Intaglio intaglio printing plate provided.

The object of the invention is therefore to specify a method of the type mentioned with which the disadvantages mentioned can be avoided

which the quality of intaglio intaglio printing can be improved. According to the invention, this is achieved by the features of patent claim 8. The advantages of the method correspond to the advantages mentioned above.

The dependent claims relate to further advantageous configurations of the invention.

Express reference is hereby made to the wording of the claims, whereby the claims at this point by reference in the description

are included and are deemed to have been reproduced verbatim.

3

The invention will be described with reference to the accompanying drawings, in which only preferred embodiments are shown by way of example,

described in more detail. It shows:

1 shows a schematic representation of a first preferred embodiment

an intaglio intaglio printing plate in side view;

2 shows a schematic representation of a depth profile with a micro-corrugation according to a first preferred embodiment of an intaglio

intaglio printing plate in side view;

3 shows a schematic representation of a second preferred embodiment

an intaglio intaglio printing plate in side view;

4 shows a schematic representation of a depth profile with two micro-corrugations according to a second preferred embodiment of an intaglio

intaglio printing plate in side view;

Fig. 5 shows a schematic representation of a first laser engraving path in

side view;

6 shows a schematic representation of a depth profile of a third preferred one

Embodiment of an intaglio intaglio printing plate in side view;

Fig. 7 shows a schematic representation of a second laser engraving path in

side view;

8 shows a schematic representation of a depth profile of a fourth preferred

Embodiment of an intaglio intaglio printing plate in side view; 9 shows a preferred embodiment of a multi-tonal printed image in plan view;

10 shows a schematic representation of a depth profile of a fifth preferred embodiment of an intaglio intaglio printing plate with colored pigments

different size in side view and

11 shows a schematic representation of a depth profile of a sixth

preferred embodiment of an intaglio intaglio printing plate with dipolar and

neutral color pigments.

1 to 11 show at least parts of a preferred embodiment of an intaglio intaglio printing plate 1 with an ink retention topography designed as a micro-corrugation 9,10.

There is also a method for engraving an intaglio intaglio printing plate 1, wherein a depth profile 2 of the intaglio intaglio printing plate 1 is generated by engraving at least one engraving layer 4, 5, 6,7, wherein at least one region of the depth profile 2 of the intaglio intaglio printing plate 1 is used for generating a color-retaining topography is provided with a micro-corrugation 9, 10, the micro-corrugation 9, 10 being provided by engraving of substantially parallel lines with

a predetermined first line spacing 11 is provided.

Furthermore, a method for printing a security feature with an intaglio intaglio printing plate 1 is provided, wherein in an inking step an intaglio printing ink is applied to the intaglio intaglio printing plate 1, wherein in a wiping step excess intaglio printing ink is wiped off the intaglio intaglio printing plate 1 along a wiping direction and wherein in a printing step, the intaglio ink from the intaglio intaglio printing plate 1

is transferred to the object to be printed.

This has the advantage that, due to the micro-corrugation 9, 10, the intaglio printing ink is held better during the wiping step in engraving sections running in the wiping direction. From a topographical point of view, the micro-corrugations 9, 10 prevent excessive ink removal from, in particular larger, connected areas, for example from a depression, of the intaglio intaglio printing plate 1 when wiping. Thus, the inking of lines along and across the wiping direction is more similar because less intaglio printing ink is wiped out of engraved stretches or engraved areas along the wiping direction. Due to the particularly flat micro-corrugation 9, 10 in the depth profile or over the engraved areas, there is no need for individual separating webs

or other additional design elements can be arranged around the

5

to obtain color retention topography. By engraving the microcorrugation 9, 10 by means of essentially parallel lines with a predetermined first line spacing 11, good ink retention on the intaglio intaglio printing plate 1 during the wiping step can be achieved easily and without additional design effort

getting produced.

Intaglio intaglio printing is a printing process for printing with an engraved intaglio intaglio printing plate 1, in which the shape of the engraving is not only applied as a color to the sheets to be printed, but there is also a lasting and often tactile plastic deformation of the printed sheets , which is why intaglio intaglio printing is often used as a security feature for security documents such as banknotes, stamps or

securities is used.

In particular, provision can be made for the intaglio intaglio printing plate 1 to be used to produce a security document, since this reliably applies high-quality security features to the security document

can become.

The finished engraved intaglio intaglio printing plate 1 has in particular a three-dimensional depth profile 2 which is opposite during the printing process

applied to the sheets to be printed.

In particular, it can be provided that a substantially flat intaglio intaglio printing plate 1 is engraved. Such flat intaglio intaglio printing plates 1

are particularly flexible in use.

Provision can preferably be made for a depth profile 2 of the intaglio intaglio printing plate 1 to be produced by engraving a plurality of engraved layers 4, 5, 6, 7, the engraved layers being formed using a predetermined desired depth profile 16

4, 5, 6, 7 can be determined.

The engraved layers 4, 5, 6, 7 are preferably produced in such a way that a plurality of substantially parallel engraved sections are engraved in an overlapping manner, as a result of which a smooth surface is removed in the engraved layer 4, 5, 6, 7 overall.

Provision can be made particularly preferably for continuous engraving sections

are generated, so continuous lines are removed and no point grid is generated. The overlapping engraving paths are exemplified in FIG. 5, resulting in a smooth surface created by the engraving layer

arises, as shown in Fig. 6 by way of example.

Particularly preferably it can be provided that the engraving by means of a

Laser beam takes place.

For this purpose it can be particularly preferred that a printing plate consisting of metal, in particular brass, is engraved directly by the laser beam. In this context, directly engraved means that a so-called master made of a less stable material such as plastic is not first engraved and the final intaglio intaglio printing plate 1 is molded from this master, but rather the intaglio intaglio printing plate 1 intended for printing is engraved directly by the laser beam. As a result, a processing step in the production of the intaglio intaglio printing plate 1 can be omitted, and the errors associated therewith can also be avoided. Brass offers the advantage that it is both easy to work with and at the same time can withstand the high mechanical loads of the intaglio

intaglio printing has grown.

Provision can preferably be made for a pulsed laser to be used as the laser. Such pulsed lasers do not emit the laser beam continuously, but rather in the form of periodically recurring short pulses, the instantaneous output power of the laser during the pulse being a multiple of the time-averaged output power of the laser. This allows a targeted removal of material from the intaglio intaglio printing plate 1 without being unduly large

thermal stress on the intaglio intaglio printing plate 1 can be achieved.

Provision can be made particularly preferably for an ultra-short-pulse laser to be used as the laser. Pulsed lasers whose pulse duration is in the picosecond, femtosecond or attosecond range are referred to as ultra-short pulse lasers. Such an ultra-short pulse laser can have a pulse duration of a few picoseconds, for example. Due to this short pulse duration and the high output power during a pulse of the ultrashort pulse laser, it comes in

Essentially to a selective removal of material of the intaglio

7725

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Intaglio printing plate 1 without adjacent areas being melted or vaporized. This eliminates the formation of burrs around the removed areas of the intaglio intaglio printing plate 1, which means that there is no need for a complex post-treatment of the intaglio intaglio printing plate 1, which has a negative effect on the quality of the engraving, for example using chemicals or polishing. By using an ultra-short pulse laser, the flanks of the removed areas are advantageously made much steeper. In addition, there is a stable laser operation, since the laser continuously emits pulses whose impingement on the intaglio intaglio printing plate 1 depending on

Template is regulated.

Alternatively, it can be provided that a continuous laser is used as the laser

is used.

Furthermore, it can alternatively be provided that the engraving layers 4, 5, 6, 7 and

the micro-corrugation 9, 10 can be engraved using a graver.

Provision can also preferably be made for the laser beam to be moved in parallel lines over the engraved area in order to remove an engraved layer 4, 5, 6, 7, with the movement speed of the laser beam in each additional line being kept approximately constant after an initial acceleration area up to a final deceleration area , and that the impingement of the laser beam on the engraving area is regulated by means of a shutter element. The impact of the laser beam on an engraving area can be regulated by means of the shutter element depending on a template. This also allows a targeted engraving of the intaglio intaglio printing plate 1 depending on the template

take place at a constant speed of movement of the laser beam.

The intaglio intaglio printing plate 1 has an ink retention topography in the form of microcorrugations 9, 10, at least in regions. The ink retaining topography is a topography of the intaglio intaglio printing plate 1, which is intended to prevent intaglio printing ink at the

wiping step is removed.

The micro-corrugation 9, 10 is particularly in the depth profile 2 of the intaglio

8th

Intaglio printing plate arranged. The micro-corrugation 9, 10 can also be referred to as micro-topography. The microcorrugation 9, 10 can preferably be present in the form of grooves arranged at a distance from one another. Those grooves

may preferably be substantially parallel to each other.

The micro-corrugation 9, 10 can be produced by engraving your own micro-corrugation layers 3, 8. The microcorrugation layers 3, 8 are similar to the other engraving layers, with one or more parameters being changed in such a way that a microcorrugation 9, 10 is produced instead of a smooth surface

This is illustrated in FIGS. 7 and 8 by way of example.

Particularly preferably, it can be provided that the engraving takes place by means of a laser beam, and that for engraving the micro-corrugation 9, 10 the first line spacing 11 and the diameter of the laser beam are selected such that the micro-corrugation 9, 10 is created. The first line spacing 11 is the distance between the centers of the individual engraving sections in the respective microcorrugated layer 3, 8.

For this purpose, it can be provided that for engraving the microcorrugation 9, 10 the first line spacing 11 of the laser beam is selected to be larger than in the other engraved layers 4, 5, 6, 7, as a result of which the microcorrugation 9, 10 is produced in a particularly simple manner

can be.

However, it can also be provided that for engraving the microcorrugation 9, 10 the first line spacing 11 of the laser beam is selected to be the same as for the other engraved layers 4, 5, 6, 7 and the diameter of the laser is changed

will.

For this purpose, it can further be provided that for engraving the microcorrugation 9, 10 the diameter of the laser beam is selected to be larger than for the other engraved layers 4, 5, 6, 7. The first line spacing can be 11

be adjusted.

Alternatively, provision can be made for the diameter of the laser beam to engrave the microcorrugation 9, 10 to be smaller than for the other engraving layers 4, 5, 6, 7

is chosen.

However, it can also be provided that for engraving the microcorrugation 9, 10 the diameter of the laser beam is chosen to be the same as for the other engraving layers 4, 5, 6, 7 and the laser power and/or the first line spacing 11

be adjusted.

It can preferably also be provided that the at least one engraving layer 4, 5, 6, 7 is produced by engraving essentially parallel lines with a predetermined second line spacing 12, and that the second

Line spacing 12 is smaller than the first line spacing 11.

Provision can preferably be made for the second line spacing 12 to be constant

is held.

Furthermore, it can also be provided that the first line spacing 11 is constant

is held.

In order to engrave smooth surfaces, it can be provided that the second line spacing 12 corresponds approximately to half the laser diameter, so that the superimposition of the individual ablation profiles results in a smooth surface, as shown in FIG. 6 by way of example. A superimposition of individual

Gaussian profiles or a laser engraving path is shown in FIG. 5 by way of example.

Depending on the laser power, the laser diameter can preferably be 15 μm to 40 μm, in particular 18 μm to 38 μm, particularly preferably 20 μm to 35 μm.

be.

The distance between the engraving sections can preferably be 10 μm, whereby the ratio of the distance to the laser diameter is 0.5 to about 0.33

amounts to.

For the engraving of the microcorrugation 9, 10, the distance between the engraving sections is particularly preferably increased, in particular with the same laser power, so that the individual ablation profiles overlap less. The ratio of distance to diameter is therefore increased, which is shown by way of example in Figs. 7 and 8

is illustrated.

The ratio of the distance between the engraving sections to the laser diameter can

10

preferably at least 0.75, in particular at least 1, particularly preferred

at least 1.5.

It can preferably be provided that with a distance between the engraving sections of 25 μm to 50 μm, the height of the microcorrugation 9, 10 is in the range from 2 μm to 7

to for a microcorrugation layer 3,8 is achieved.

It can also be provided that with an increase in laser power and a distance between the engraving sections of 60 to 100 to a height of

microcorrugations 9, 10 in the range 8 µm to 16 µm.

The height of the micro-corrugation 9, 10 is assumed to be the difference between the highest and lowest points of the micro-corrugation 9, 10, i.e. the difference between elevations and valleys within the micro-corrugation 9, 10. The height of the micro-corrugation 9, 10 is determined on the one hand by the laser power and on the other hand through

determines the distance between the engraving sections.

In order to produce an even higher micro-corrugation 9, 10, provision can be made in a particularly preferred manner for the micro-corrugated layers 3, 8 to be engraved several times. This is already engraved in the existing micro-corrugation 9, 10 with the same micro-corrugation layer 3, 8 for the micro-corrugation 9, 10, whereby the height

the micro-corrugation 9, 10 can be increased.

Provision can furthermore preferably be made for essentially the entire surface of the depth profile 2 to be provided with the micro-corrugation 9 , 10 . As a result, particularly good ink retention of the intaglio printing ink on the intaglio intaglio printing plate 1 can be achieved during the wiping step. Here, the entire depth profile 2 is provided with a micro-corrugation 9.10, whereby the

quality of the intaglio intaglio printing is further increased.

In particular, it can be provided that the micro-corrugation 9.10 is engraved last. As a result, the micro-corrugation 9.10 is not later due to the engraving

Engraving layers 4, 5, 6, 7 affected.

Particularly preferably, it can be provided that based on the to be engraved

Depth profile 2 each depth is assigned an engraving layer 4, 5, 6, 7, the

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Engraving layer of a first depth is engraved after the engraving layer of a second depth, the second depth being deeper than the first depth. Particularly preferably, the sequence of the engraved layers 4, 5, 6, 7 can be chosen such that the engraved layers 4, 5, 6, 7 are engraved in descending order of their depth. The advantage here is that when the sequence of engraved layers 4, 5, 6, 7 is reversed, the staircase effect is reduced, since the last layer is the widest and thus at least slightly overlaps the preceding layers. With such a

Conversely, the microcorrugation 9, 10 can be produced particularly easily.

The depth of an engraving layer 4, 5, 6, 7 is determined by the side to be engraved

the intaglio intaglio printing plate 1 seen.

In Fig. 1, the gravure layers 4, 5, 6 and the micro-corrugated layer 3 for generating a depth profile 2 of a first embodiment are shown as an example. In FIG. 1, and later also in FIG. 3, the desired depth profile 16 is represented by the solid line. The planes of the gravure layers 4, 5, 6 and the microcorrugation layer 3 are represented by dashed or dotted lines. The size of the area of the individual levels within the target depth profile 16 also represents the size of the respective gravure layers 4, 5, 6 or microcorrugation layer 3. The third gravure layer 6 represents the deepest gravure layer. The second gravure layer 5 is the gravure layer which the third gravure layer 6 is arranged. The first gravure layer 4 is the gravure layer that is arranged above the second gravure layer 5 and is therefore less deep than the gravure layer 5 . The microcorrugation layer 3 is the engraving layer, by means of which the microcorrugation 9

is produced.

Provision can preferably be made for this that first the third engraved layer 6, then the second engraved layer 5, then the first engraved layer 4 and finally the microcorrugated layer 3 is engraved. This allows the staircase effect

reduced and the micro-corrugations 9 are clearly formed.

FIG. 2 shows an example of a depth profile 2 with a micro-corrugation 9, which is produced by means of the sequence of the engraved layers 4, 5, 6 according to FIG

would.

12

In Fig. 3, the gravure layers 4, 5, 6, 7 and several microcorrugated layers 3, 8 for generating a depth profile 2 of a second preferred embodiment are shown as an example. In comparison to the first preferred embodiment, an additional fourth gravure layer 7 appears, which lies deeper than the third gravure layer 6, as well as two different micro-corrugated layers 3, 8, a first micro-corrugated layer 3 and a second micro-corrugated layer 8. The first micro-corrugated layer 3 is included greater than

the second microcorrugation layer 8.

The depth profile 2 resulting from these gravure layers 4, 5, 6, 7 and microcorrugated layers 3, 8 is shown in FIG. 4 as an example. Because of the two different micro-corrugation layers 3, 8, two different micro-corrugations 9, 10 were also produced. The first micro-corrugation 9 was created solely by the first micro-corrugation layer 3 . The second microcorrugation 10 has been engraved by both microcorrugation layers 3, 8 and is therefore more pronounced than

the first micro-corrugation 9.

An intaglio intaglio printing plate 1 usually already has a predetermined wiping direction during its planning and manufacture. The wiping direction is the direction in which the intaglio intaglio printing plate 1 is wiped off, in particular with a squeegee, after the intaglio printing ink has been applied. In particular, the head and foot of the intaglio intaglio printing plate 1 are specified, the

wiping direction runs along this direction.

It can preferably be provided that the micro-corrugation 9, 10 is not engraved parallel to the specified wiping direction. This results in good color retention.

Particularly preferably, it can be provided that the micro-corrugation 9, 10 is engraved at an angle to the specified wiping direction. The micro-corrugation 9, 10 runs

therefore preferably also not perpendicular to the wiping direction.

In particular, it can be provided that the micro-corrugation 9, 10 in one

Angular range runs to the wiping direction of at least 45 °.

It can preferably be provided that the micro-corrugation 9, 10 in one

13

Angular range runs to the wiping direction of a maximum of 87 °.

As a result, good ink retention of the intaglio printing ink on the intaglio intaglio printing plate 1 can be achieved in the depth profile 2 during the wiping step. It has been shown that this improves the quality of the intaglio

Intaglio printing is significantly improved.

Provision can particularly preferably be made for the intaglio intaglio printing plate 1 to be set to a prescribable electric potential before the wiping step and to be kept at the electric potential during the wiping step, which is shown in FIG. 11 by way of example. Here, the intaglio intaglio printing plate 1 is set to a negative potential V−. Dipole-like pigments, whose dipoles are indicated by +/- in FIG. 11, are therefore drawn more firmly to the microcorrugation 9, 10 of the intaglio intaglio printing plate 1 and are pushed or removed less strongly from the depth profile 2 during the wiping step

as pigments and other color components marked with n.

It is provided here that the intaglio printing ink contains color pigments which either have a permanent dipole moment or in which a dipole moment can be induced by an electrostatic field. The intaglio intaglio printing plate 1 preferably consists of metal and is set to an electrical potential V- before or after the inking step, but in any case before the wiping step. As a result, the pigment dipoles align themselves in the resulting electrostatic field and are attracted by the intaglio intaglio printing plate 1. Increased ink retention on the intaglio intaglio printing plate 1 is thereby achieved during the wiping step. By engraving a micro-corrugation 9, 10, in particular by the protruding elements, for example tips, of the micro-corrugation 9, 10, a locally higher field strength is achieved, whereby the attraction in particular on the tips of the micro-corrugation 9, 10 is higher than on the planum of the intaglio intaglio printing plate 1 is Before the printing process, the intaglio intaglio printing plate 1 is grounded to

reset potential.

The advantage here is that a multi-tonality of the intaglio printing simply over

the electrostatic properties of the pigments can be controlled. It can

14

thereby a local variation of the hue can be generated and it can further

dynamic effects can also be created.

This results in a synergy effect, since the field effects are locally increased by the peak effect of the unevenness of the microcorrugation 9, 10,

whereby a particularly good color retention is made possible.

Provision can furthermore preferably be made for the intaglio intaglio printing plate 1 to be magnetized before the wiping step via a predeterminable external magnetic field

will.

It is provided here that the intaglio intaglio printing plate 1 contains color pigments with hard or soft magnetic properties. In particular, the intaglio intaglio printing plate 1 consists of a metal with ferromagnetic properties and is magnetized by an external magnetic field before the wiping step. The colored pigments are magnetostatically attracted to the intaglio intaglio printing plate 1 and are therefore less easily removed during the wiping step. Here, too, a locally higher field strength is achieved at the tips of the micro-corrugations 9, 10, as a result of which the attraction in particular on the tips of the micro-corrugations 9, 10 is higher than on the planum of the intaglio intaglio printing plate 1. Before the printing process, the magnetic field of the intaglio intaglio printing plate 1 is reset to transfer the color from the

To facilitate intaglio intaglio printing plate 1 on the object to be printed.

The advantage here is that a multitonality of the intaglio printing can be easily controlled via the magnetostatic properties of the pigments. In this way, a local variation of the hue can be generated and it can also

dynamic effects can also be created.

There is also a synergy effect here, since the field effects are locally increased by the peak effect of the unevenness of the microcorrugation 9, 10.

whereby a particularly good color retention is made possible.

Provision can be made for the electric and/or magnetic field not to be reset before the printing process, ie no grounding applied or none

degaussing is performed. Here, the dipole pigments during the

15

Printing process oriented according to the field direction. If pigments are used, which have a different color impression depending on the orientation

have, a local variation of the hue can be achieved.

It can also be particularly preferred that an intaglio printing ink with pigments of different colors is used for printing the security feature

Color and different size is used.

It can be provided in particular that the intaglio printing ink is not a powder ground to a uniform size, but rather pigments of different types

shape and size.

In FIG. 9, a multi-tonal printed image 13 is shown as an example, with an intaglio printing ink having two different pigments of different sizes

has been used.

10 shows an example of an arrangement of pigments of different sizes in a depth profile 2 of an intaglio intaglio printing plate 1. Large pigments 14 can be held back particularly well in a partial area with a deeply formed microcorrugation 10. Higher concentrations of small pigments 15 with isolated large pigments 14 can also be arranged between and next to the large pigments 14 in a further partial area. This creates a multi-tonality in the finished printed image, which can be influenced in a targeted manner by means of one or more micro-corrugations 9, 10. Here, the large pigments 14, for example, pigments of a first color and the small

Pigments 15 can be pigments of a second color, for example.

Adapted to the size of different pigments, preferably micro-corrugations 9, 10 can be engraved with different heights. The shape, in particular the height of a micro-corrugation 9, 10 and the spacing of the individual corrugations from one another can essentially correspond to the size of a pigment

be adjusted.

It can also be provided that two or more than two micro-corrugations 9, 10

are arranged next to each other with different heights.

Dynamic effects can also be created when using pigment flakes

a color variation can be generated via thin film interference.

The different

Pigments are particularly well retained during the wiping step.

Claims (11)

17 GIBLER&POTH PATENT ATTORNEYS PATENT CLAIMS 1. A method for engraving an intaglio intaglio printing plate (1), wherein a depth profile (2) of the intaglio intaglio printing plate (1) is generated by engraving at least one engraving layer (4, 5, 6, 7), characterized in that at least one area of the depth profile (2) of the intaglio intaglio printing plate (1) for generating an ink retention topography with a micro-corrugation (9, 10) is provided, wherein the micro-corrugation (9, 10) by engraving of essentially parallel lines with a predetermined first line spacing (11) is generated. 2. The method according to claim 1, characterized in that the engraving takes place by means of a laser beam, and that for engraving the microcorrugation (9, 10) of the first line spacing (11) and the diameter of the Laser beams are chosen in such a way that the microcorrugation (9, 10) is created. 3. The method according to claim 1 or 2, characterized in that the at least one engraving layer (4, 5, 6, 7) is produced by engraving essentially parallel lines with a predetermined second line spacing (12), and that the second line spacing ( 12) is smaller than the first line spacing (11). 4. The method according to any one of claims 1 to 3, characterized in that the micro-corrugation (9, 10) is not parallel to a predetermined wiping direction is engraved. 5. The method according to any one of claims 1 to 4, characterized in that substantially the entire surface of the depth profile (2) with the Microcorrugation (9, 10) is provided. 18 6. The method according to any one of claims 1 to 5, characterized in that an engraved layer (4, 5, 6, 7) is assigned to each depth based on the depth profile (2) to be engraved, the engraved layer (4, 5, 6, 7 ) is engraved a first depth after the engraving layer (4, 5, 6, 7) a second depth, wherein the second depth is deeper than the first depth. 7. Intaglio intaglio printing plate (1) with a micro-corrugation (9, 10) designed color retention topography, produced in particular by a A method according to any one of claims 1 to 6. 8. A method for printing a security feature with an intaglio intaglio printing plate (1) according to claim 7, wherein in an inking step an intaglio printing ink is applied to the intaglio intaglio printing plate (1), wherein in a wiping step excess intaglio printing ink is wiped off the intaglio intaglio printing plate (1) along a wiping direction and wherein in a printing step the intaglio printing ink is removed from the intaglio intaglio printing plate(1) is transferred to the object to be printed. 9. The method according to claim 8, characterized in that the intaglio intaglio printing plate (1) is set to a prescribable electric potential before the wiping step and to the electric potential during the wiping step is held. 10. The method according to claim 8, characterized in that the intaglio intaglio printing plate (1) before the wiping step via a predeterminable external magnetic field is magnetized. 11. The method according to any one of claims 8 to 10, characterized in that an intaglio printing ink with pigments (14, 15) of different colors and different sizes is used to print the security feature will.