Device and method for rotary blind embossing of a substrate and die

Abstract

The invention relates to a device (1) for the rotary blind embossing of a substrate (3), wherein the device (1) comprises a work station (1a) which comprises a magnetic embossing roller (2a) and a counter-pressure roller (2b), wherein at least one matrix (4a) is magnetically arranged on the magnetic embossing roller (2a) and at least one patrix (4b) is arranged on the counter-pressure roller (2b), wherein the at least one matrix (4a) is multi-layered and has at least one first metal layer (8) made of a ferromagnetic material, wherein the at least one matrix (4a) has a film (7) on the side facing the magnetic embossing roller (2a).

Description

The invention relates to a device for the rotary blind embossing of a substrate, a die and a method for the rotary blind embossing of a substrate.For the refinement of substrates, such as, for example, packaging, blind embossing is common. In this case, a specific pattern, motif or writing is produced in the substrate by means of a die and a patrix. In the case of embossing, the pattern, motif or writing is embossed, deepened into the substrate in the case of embossing. Typically, the blind embossing takes place either as stroke embossing or as cylinder embossing, which is also referred to as rotary blind embossing. In rotary blind embossing, the substrate to be embossed is guided between an embossing roller and a counter-pressure roller and embossed into the substrate with corresponding shapes, so-called matrices and male embossings, depressions and / or elevations. For this purpose, the embossing roller is equipped with so-called dies and the counter-pressure roller with so-called male dies. Depending on the motif to be embossed, the matrices and male dies are interchangeably mounted or fastened on the respective rollers. The male mold forms the so-called male mold (male mold) and the female mold forms the corresponding female mold (female mold). The die on the embossing cylinder and the punch on the impression cylinder must be arranged in register with one another, so that in the overlap region, i.e. the region in which the die strikes the punch, are positioned substantially in register with one another. The accurate positioning in register is important on the one hand for the embossing quality and on the other hand in order to avoid damage to the dies and / or male dies.For example, a rotational blind embossing method and a device are known from DE 102018102638 A1. Magnetic rollers are used on which the matrices and male matrices are positioned magnetically. The use of magnetic matrices and male tools offers the substantial advantage that they can be replaced in a simple manner, no residues, such as adhesive, remain on the roller and short changeover times can be achieved in comparison with screwing or gluing female tools and / or male tools. The alignment of the magnetic matrices and male matrices is effected with an adjustment aid, a so-called window plate. The window panel has webs and window regions in which the matrices and / or male matrices are later positioned. This window sheet is initially placed on the respective roller and held on the roller by means of a magnet. The dies and / or male dies, which have a steel underside, are then positioned on the magnet rollers in the window regions. The underside of the dies and / or male dies is then attracted to the magnet in the magnet roll and held on the surface of the roll. However, the disadvantage of this is that as the operating time increases, the matrices and / or the male matrices move in the longitudinal direction on the roller. This has the result that the embossing on the substrate can no longer be formed in register with a print. However, it can also result in the die no longer being congruent in the overlap region or being arranged in register with the male die. This inevitably leads to damage to the die and / or punch and thus likewise to deterioration of the embossing result.The object of the invention is to provide an improved method and an improved device for blind embossing of a substrate, in particular wherein the registration or positional stability of the die magnetically fastened on the embossing roller is improved. It is a further object of the invention to provide an improved die for use in a blind embossing apparatus.This object is achieved by a device for the rotary blind embossing of a substrate, wherein the device comprises a work station which comprises a magnetic embossing roller and a counter-pressure roller, wherein at least one die is arranged magnetically on the magnetic embossing roller and at least one punch is arranged on the counter-pressure roller, wherein the at least one die is of multilayer design and has at least one first metal layer made of a ferromagnetic material. It is essential here that the at least one die has a film on the side facing the magnetic embossing roller.This object is further achieved by a die, in particular for use in a device according to one of claims 1 to 21, wherein the die is of multi-layered design and has at least one first metal layer made of a ferromagnetic material. It is essential here that the die has a film on its underside.This object is also achieved by a method for rotary blind embossing of a substrate using a device according to one of claims 1 to 21, wherein the method comprises the following steps, in particular in the following sequence: a) providing a substrate; b) arranging at least one die, in particular according to one of claims 22 to 34, on a magnetic embossing roll; c) arranging at least one male die on a counter-pressure roll; d) blind embossing of the substrate by means of the at least one die and the at least one male die.It has been shown here that, by means of the device for rotary blind embossing of a substrate and the die and the method for rotary blind embossing of a substrate, the holding force of the die on the magnetic embossing roller, in particular in the case of tangential loading, is up to 50% higher or more than 50% higher than in the case of conventional dies known from the prior art, which are fastened to the embossing roller by means of magnetic force. This holding force, which is higher by approximately 50%, ensures that the at least one die on the embossing roller retains its position during the machining period or retains it for a longer time during the machining period than conventional dies. This significantly reduces maintenance work. Furthermore, this also ensures that the embossing quality is constantly high over the machining cycle. At the same time, the positional stability and / or register stability of the die on the magnetic embossing roller ensures that the at least one punch is not damaged. This also ensures a constant embossing quality. Furthermore, the advantage is offered that the at least one die can nevertheless be released comparatively easily from the magnetic embossing roller by lifting the latter radially from the magnetic embossing roller. Due to this solution, the device can be easily re-fitted and the dies can be changed accordingly for a new embossing series without leaving adhesive residues on the embossing roll or having to loosen screws or other fastening means. The changeover times are thus also correspondingly reduced.In this case, blind embossing is understood to mean, in particular, relief embossing without the use of an ink, in particular a printing ink, and / or without the use of a transfer film, in particular a hot embossing film or cold embossing film. Preferably, a pattern, motif or writing is embossed into the substrate, wherein in particular in the case of an embossing the pattern, motif or writing is raised and / or in the case of an embossing the pattern, motif or writing is embossed deep into the substrate.A die is understood here in particular to mean an embossing tool which has the corresponding relief shape as elevations and / or depressions, wherein the die preferably has the relief shape of the relief embossing to be achieved in a mirrored arrangement, i.e. in a non-directly readable arrangement.A male die is understood here in particular to mean an embossing tool which has the corresponding relief shape as elevations and / or depressions, wherein the male die preferably has the relief shape of the relief embossing to be achieved in a non-mirrored arrangement, i.e. in a readable arrangement.The die and the male die fit together in particular in such a way that the relief embossing is produced in readable form in the substrate. Preferably, for this purpose, the die acts on the substrate from the top side and the punch acts on the substrate from the bottom side, wherein the top side of the substrate represents the viewing side in the later form of use of the substrate.The die and the punch can in particular also be arranged in a manner reversed from the arrangement described above, if, for example, a transparent substrate is to be viewed from the underside of the substrate in the later form of use.Register or register or register accuracy or register accuracy is to be understood in particular as meaning an accuracy of position of two or more elements and / or layers relative to one another, here for example the accurate arrangement of the embossing and further features applied to the substrate, such as for example a print, layers applied to the substrate and / or fold lines or crease lines, relative to one another. The register accuracy should advantageously move within a predetermined tolerance and should be as low as possible. At the same time, the register accuracy of a plurality of elements and / or layers with respect to one another is expediently an important feature in order to increase the process reliability. The positionally accurate positioning can be effected in particular by means of sensory, preferably optically detectable registration marks or register marks. These registration marks can either represent special separate elements or areas or layers or can themselves be part of the elements or areas or layers to be positioned.The lower side is preferably to be understood as the side of the at least one die which, in the installed state, faces the embossing roller.Further advantageous embodiments of the invention are specified in the dependent claims.It is advantageous in step d) for the substrate to be blind-stamped in such a way that the substrate has at least one elevation and / or depression.An elevation and / or depression of the substrate is understood in particular as a relief shape which represents a pattern, motif or writing and which is preferably arranged either elevated (embossing) thereto or depressed (embossing) thereto relative to an unprocessed region of the substrate.An elevation of the substrate is preferably an embossing, so that the pattern, motif or writing is embossed in the substrate in a raised manner. A depression of the substrate is preferably an embossing, so that the pattern, motif or writing is embossed deep into the substrate.It is furthermore advantageous if the at least one elevation and / or depression of the substrate in step d) is produced with a height and / or depth of at least 0.01 mm, preferably at least 0.03 mm, more preferably at least 0.1 mm. This makes it possible to produce blind embossings that are visually and haptically appealing.It is preferably provided that in step b) the arrangement of the at least one die takes place by means of a positioning system in that the positioning system interacts with the magnetic embossing roller in such a way that the magnetic embossing roller is rotated by a predefined rotation angle in order to define the position of the at least one die in the radial direction of the magnetic embossing roller, and that subsequently the position of the at least one die in the axial direction of the magnetic embossing roller is defined. It may also be possible, furthermore, for the at least one die to be placed along a stop in step b) and then to be magnetically fastened to the surface of the magnetic embossing roller. The positioning system thus allows a plurality of matrices to be applied to the embossing roller in a space-saving manner. That is to say, the distance between the individual dies can be significantly reduced by using the positioning system than, for example, by using window sheets or other positioning aids. The stop preferably specifies the position in which the die is applied to the magnetic embossing roller. Preferably, the die is manually placed against the stop and then fastened to the magnetic embossing roller by means of the magnet or the magnetic force.It may also be possible that before step b) or in step b) the at least one die is bent, in particular so that the rounding of the die substantially corresponds to the rounding of the magnetic embossing roller. In particular, it is possible for the at least one die to be deformed in such a way that the at least one die has a curvature which substantially corresponds to the curvature of the magnetic embossing roller. This achieves an adaptation of the shape of the die to the shape of the magnetic embossing roller, so that the die can be used for rotary blind embossing.Rounding is preferably understood here as a radius of curvature, wherein the radius of curvature corresponds in particular to the radius of a circle of curvature which, at a specific point of a curve, is that circle which the curve best approximates at this point.In particular, it is possible that in step b) the at least one die is arranged on the magnetic embossing roller in such a way that the film faces the surface of the magnetic embossing roller. This advantageously leads to the adhesive force of the die on the magnetic embossing roller being significantly increased compared to forces acting approximately tangentially, in particular being increased by up to 50% or more than 50%, than in conventional dies having an underside made of steel. This is attributable in particular to the fact that the film, in particular which is formed from a thermoplastic elastomer, fits tightly against both the first metal layer of the die and the outer periphery of the magnetic embossing roller. Air inclusions between the die and the magnetic embossing roller are thereby reduced, which leads to a "vacuum effect". In other words, this means that the die has an increased adhesive force in the tangential direction, whereby a displacement of the die during the embossing process and due to the tangential forces occurring during the embossing process is reduced or even completely prevented. Thus, the positional accuracy of the at least one die is maintained throughout the entire embossing cycle. Furthermore, the at least one die is nevertheless easy to remove from the magnetic embossing roller by lifting it preferably radially from the magnetic embossing roller. In this case, only the magnetic force of the magnetic embossing roller has to be overcome. The effects of the increased adhesive force by the film on the side of the die facing the surface of the magnetic embossing roller thus occur only slightly or not at all in the radial direction of the magnetic embossing roller.Further, respective comparative experiments were prepared in which, for simplicity, a flat die was carried out on a flat magnet surface which is similar in composition to the magnetic embossing roll. This simplification was made because in this test setup the force can always be applied in the tangential direction. In the case of a curved surface, on the other hand, the force would only be applied in a single point or in a single line in the tangential direction. In all other points, in addition to forces in the tangential direction, forces in the radial direction would also occur. Two samples of matrices were prepared for the experiment. The first sample is a die according to the prior art, i.e. the underside of the die is formed from steel. The second sample is a die according to the invention, in which a foil is arranged on the underside of the steel layer. In the context of the comparative experiment, this film is a polypropylene film provided with an adhesive coating and designated "PP GL Clear TC-3 RP-37 HD 70 WHITE" ("PP GL Clear"= polypropylene Glossy Transparent; "TC-3" = topcoating / printing coating; "RP-37"= with dispersion acrylate adhesive (PSA) coating; "HD 70 WHITE"= with peelable silicone liner for protecting the dispersion acrylate adhesive (PSA) coating before the film is adhesively bonded) from RPM Raflatac with a thickness of 50 μm. The two samples each have a dimension of 14.50 cm x 14.50 cm and thus take up an area of 210.25 cm 2. Furthermore, a bore was introduced into each sample, into which bore a conventional bag balance was suspended by means of a carabiner. For the experiment, the surfaces of the die and the magnet surface were first cleaned and deoiled. Subsequently, the samples of the die were placed successively on the magnet surface and then the force required to move the die from the magnet surface was measured by means of the case balance in the tangential direction. For the conventional die according to the prior art, a force equivalent of 15 kg to 20 kg was measured. In contrast, a force equivalent of ≥30 kg was measured for the inventive die. Thus, the measured adhesive force or holding force in the tangential direction of the die according to the invention is higher by over 50% than in conventional dies. A further increase in the holding force in the tangential direction can be achieved by selecting suitable other polymer materials.In particular, it can be provided that in step c) at least one carrier plate is first arranged on the circumference of the counter-pressure roller. The carrier plate serves in particular to receive the at least one patrix. This can be done in different ways, as described below.For example, it can be provided that in step c) according to a first variant I) a material cardboard sheet is arranged, in particular glued, on the carrier sheet, and preferably the material cardboard sheet is moistened, and the material cardboard sheet is embossed with the at least one die arranged on the magnetic embossing roller, in order to form the at least one score in the material cardboard sheet. Moistening is preferably effected by means of a spray device which applies a slight spray mist to the cardboard sheet. As a result of the moistening, the material cardboard sheet becomes soft and the contour of the die can thus be stamped more easily as a counterform into the material cardboard sheet.It is also possible that in step c) during the embossing according to the first variant I) the material cardboard sheet is compacted, in particular wherein the moisture is forced out of the material cardboard sheet.It can also be provided that in step c) during the embossing according to the first variant I) the magnetic embossing roller is heated, in particular with a temperature in the range of 25° C. to 50° C., preferably of 30° C. to 45° C., particularly preferably of 35° C. to 40° C., in order to dry the material cardboard sheet, so that the at least one patrix solidifies.Alternatively, it may also be possible that in step c) according to a second variant II), the at least one patrix is provided with a double-sided adhesive tape on its side facing the counterpressure roller. By means of the double-sided adhesive tape, the male die is preferably bonded or fastened to the counterpressure roller, in particular the carrier sheet. The patrix can comprise materials, for example, individually or in combination selected from: plastic, silicone, rubber, brass.Preferably, it is provided that in step c) according to the second variant II) the male die is positively glued to the at least one die by means of an adhesive or adhesive tape or adhesive pieces and then the at least one male die is applied to the counterpressure roller, in particular by bringing the embossing roller into contact with the counterpressure roller. It is preferably provided that the adhesive tape facing the counterpressure roller has a higher adhesive force or adhesive force than the adhesive or the adhesive tape or the adhesive pieces facing the die. This ensures that when the at least one punch is brought into contact with the counterpressure roller, the at least one punch is firmly fastened on the counterpressure roller and the punch is released from the die. Furthermore, it is provided that any adhesive residues on the punch top side, i.e. the side facing the die, are removed. Analogously, adhesive residues on the upper side of the at least one die can also be removed.Alternatively, it may also be possible that in step c) according to a third variant III) a UV-curable plastic is applied to the carrier sheet at least partially or over the entire surface, which is at least partially precrosslinked by means of a UV pre-curing light source, and subsequently the precrosslinked UV-curable plastic is embossed by means of the at least one die, such that at least one male mold is introduced into the precrosslinked UV-curable plastic and finally the precrosslinked UV-curable plastic is fully cured by means of a UV final curing light source. The precrosslinking of the UV-curable plastic increases the viscosity of the UV-curable plastic in such a way that it remains independently in its shape, but is nevertheless deformable in such a way that it can be deformed by external force effects. This ensures that the contour of the at least one die is stamped as a counter-mold into the UV-curable plastic. As soon as the contour has been stamped out, the UV-curable plastic is completely cured. From this point on, the UV-curable plastic can no longer be deformed without the UV-curable plastic breaking or destroying it.It is preferably provided that the magnetic embossing roller and the counter-pressure roller are driven in mutually opposite directions at mutually corresponding rotational speeds. It is thus also possible for the magnetic embossing roller and the counter-pressure roller to be drivable in mutually opposite directions at mutually corresponding rotational speeds.In this case, the at least one die and the at least one male die preferably engage in one another during each revolution in such a way that the substrate located between the at least one die and the at least one male die is embossed, in particular in an overlap region of the at least one die and the at least one male die. It is thus also possible for the at least one die and the at least one punch to be arranged in such a way that, during each revolution, they engage one another in such a way that the substrate located between the at least one die and the at least one punch can be made visible, in particular in an overlap region of the at least one die and the at least one punch.In particular, it is provided that the ratio of the diameter of the embossing roll to the diameter of the counter-pressure roll is 1 to 2, preferably 1 to 1.It is further advantageous that the substrate is embossed such that the deviations between the embossings of each revolution are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.Expediently, the method further comprises the following step:feeding the substrate to the work station comprising the magnetic embossing roller and the counter-pressure roller.It is furthermore expedient if the method further comprises at least one of the following steps, which are carried out in one or more further workstations:printing on the substrate;cold embossing the substrate;hot embossing the substrate;Braille blind embossing of the substrate;separating, in particular cutting, the substrate;grooves and / or folds of the substrate.It is thus also possible for the device to further comprise one or more further work stations for printing on the substrate and / or for cold embossing the substrate and / or for hot embossing the substrate and / or for Braille blind embossing the substrate and / or for severing, in particular cutting, the substrate and / or for grooving and / or folding the substrate. Preferably, the one or more further work stations are arranged before and / or after the work station comprising the embossing roller and the counter-pressure roller.Printing is preferably effected here by means of offset printing, screen printing, gravure printing, relief printing, flexographic printing or inkjet printing. It is further preferred if the pressure is generated by means of a pressure roller. During printing, one or more printing inks are advantageously applied to the substrate, in particular according to a printing raster. The substrate is preferably cut by punching, wherein in particular the substrate is cut by means of a cutting tool and / or punching tool. In the case of grooving, the bending ability of the substrate is preferably changed by means of a pressing tool, in particular by material displacement. Folding is preferably understood to mean producing a sharp bending edge with the aid of a tool.According to a further exemplary embodiment of the invention, the substrate is preferably processed continuously.It is also advantageous that, in particular in step a), the substrate is provided as sheet material. The sheet material can be provided in particular as a stack of sheets or alternatively the substrate can be provided as a roll material which is divided in particular in-line into individual sheets with the aid of a cross-roll cutter and the substrate is thus provided as a sheet material.It is further preferred here if the deviations between the embossings on the sheets of the substrate provided as sheet material are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.Furthermore, it is possible that more than 8000 sheets per hour, preferably more than 10000 sheets per hour, more preferably more than 12000 sheets per hour, even more preferably more than 15000 sheets per hour, of the substrate provided as a sheet material are processed by means of the method and / or the apparatus.It is preferably provided that the magnetic embossing roller has a permanent magnet and / or that the magnetic embossing roller is designed as a magnetic cylinder. This allows the magnetic embossing roller to be easily and quickly fitted with at least one die or a plurality of dies.It may also be possible for the magnetic embossing roller to be temperature-controlled, in particular wherein the magnetic embossing roller has a temperature in the range from 25° C. to 50° C., preferably from 30° C. to 45° C., particularly preferably from 35° C. to 40° C. The temperature control is advantageous in particular when, as mentioned above, the at least one punch is shaped or stamped into a material cardboard or material cardboard sheet by means of the at least one die.In particular, it is possible for the impression roller to have a permanent magnet and / or for the impression roller to be designed as a magnetic cylinder. As a result, for example, a carrier plate can be arranged or fastened on the impression cylinder in a simple manner.It can also be provided that at least one support plate is arranged on the circumference of the counterpressure roller, wherein on the support plate at least one support plate is arranged.a die box is arranged in which at least one corresponding male die is molded to the at least one female die; orII) at least one corresponding male die is arranged to the at least one female die; orIII) a UV-curable plastic is applied over the surface, in which at least one corresponding male mold is molded to form the at least one female mold.This can achieve the effect that, for example, the at least one male die is produced, for example, from a softer material, individually or in combination selected from plastic, silicone, rubber, brass, than the at least one female die. A good embossing result is preferably achieved in this case, in particular since the softer male die adapts to the relief shape of the harder female die, which is made of metal, for example.It may also be possible for the device to comprise a positioning system for arranging the at least one die on the embossing roller, wherein the positioning system has a displaceable stop. The stop preferably serves for the exact positioning of the at least one die on the magnetic embossing roller.It can also be possible for the positioning system to be arranged in the immediate vicinity of the magnetic embossing roller and to cooperate with the magnetic embossing roller.Advantageously, it is provided that the position of the at least one die in the radial direction of the magnetic embossing roller can be defined by the angle of rotation of the magnetic embossing roller and the position of the at least one die in the axial direction of the magnetic embossing roller can be defined by the position of the stop.It may also be possible for the at least one die and / or the at least one punch to have at least one elevation and / or depression, which corresponds in particular to the relief shape to be embossed in positive and / or negative form. It is further possible that the at least one elevation and / or depression represents a pattern, motif or writing. A pattern can be, for example, a graphically designed outline, a figurative representation, an image, a symbol, a logo, a portrait and the like. A font may be, for example, an alphanumeric character, a text, and the like.It is furthermore advantageous that the at least one elevation of the at least one die and / or of the at least one male die has a height of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm, and / or that the at least one depression of the at least one die and / or of the at least one male die has a depth of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm.It is possible that the at least one elevation and / or depression of the at least one die and / or of the at least one male die has a shape selected from the group: round, flat, round-flat, flat-edged, prismatic, prismatic-flat, pointed or mixed shapes of these shapes.It is further possible that the at least one elevation and / or depression of the at least one die and / or of the at least one punch is configured in a multistage manner, in particular sculptured, in terms of its height and / or its depth.Sculptured is preferably understood to mean a relief form which represents or forms a sculpture, a motif, a pattern or a writing. Preferably, the at least one elevation and / or depression of the at least one die and / or of the at least one male die has at least one side flank, wherein the angle between the at least one side flank and a line running parallel to the surface of the at least one die and / or of the at least one male die is between 0° and 180°, preferably between 45° and 135°, more preferably between 80° and 100°, even more preferably between 85° and 95°.It is furthermore expedient if the at least one elevation and / or depression has a round shape such that the shape of the elevation and / or depression is substantially defined by a circular section, in particular having a radius between 0.1 mm and 2.5 mm, preferably between 0.3 mm and 0.7 mm. The shape of the elevation and / or depression can also be substantially elliptical, the smaller radius of the ellipse having a dimension between 0.1 mm and 2.5 mm, preferably between 0.3 mm and 0.7 mm.It is also advantageous if the at least one die has a thickness in a range from 0.1 mm to 5 mm, preferably from 0.5 mm to 3 mm, and / or the at least one punch has a thickness in a range from 0.1 mm to 5 mm, preferably from 0.5 mm to 3 mm.In particular, it is possible for the first metal layer to comprise a material or combinations of materials selected from: iron, ferrites, cobalt and / or nickel. The first metal layer can preferably be steel.The first metal layer preferably has a thickness in the range from 0.05 mm to 1.5 mm, preferably from 0.1 mm to 1 mm, more preferably from 0.15 mm to 0.5 mm.It can also be provided that the die comprises a second metal layer, in particular wherein the second metal layer comprises a material or combinations of materials selected from: brass, bronze, copper, nickel, zinc, tin, lead, iron and / or steel. The second metal layer is preferably that layer which faces the substrate or the at least one patrix. The elevations and / or depressions are preferably introduced into the second metal layer. Preferably, the second metal layer is formed of brass.The second metal layer preferably has a thickness in the range from 0.3 mm to 2.5 mm, preferably from 0.5 mm to 2 mm, more preferably from 1 mm to 1.2 mm.It is preferably provided that the first metal layer is formed from steel and the second metal layer is formed from brass.It is advantageous if the die comprises an adhesive layer. Preferably, the adhesive layer is arranged between the first metal layer and the second metal layer.It is furthermore advantageous if the adhesive layer is a hot-melt adhesive or cold-melt adhesive layer.It is thus also possible for the adhesive layer to be a two-component adhesive (2K adhesive), in particular comprising epoxy resins. The adhesive layer is preferably an epoxy-based 2K adhesive system, such as, for example, Araldite from Huntsman, Salt Lake City, Utah, USA.It is also advantageous if the adhesive layer is a double-sided adhesive tape. The backing material of the double-sided adhesive tape is preferably coated on two sides with a pressure-sensitive adhesive (PSA). Such double-sided adhesive tapes can be obtained, for example, from Tesa, Norderstedt, Germany.It is furthermore expedient if the adhesive layer preferably has a layer thickness in a range from 0.01 mm to 1.0 mm, preferably from 0.05 mm to 0.5 mm, more preferably from 0.06 mm to 0.25 mm.It is preferably provided that the film is or comprises a plastic film, in particular wherein the film is formed from a thermoplastic elastomer. As already mentioned above, the film is preferably arranged on the side of the die facing the magnetic embossing roller. In particular, the film thus forms the lowermost layer of the die. The film advantageously has the effect that the adhesive force of the at least one die on the magnetic embossing roller is significantly increased compared to approximately tangentially acting forces, in particular is increased by up to 50% or more than 50%, than in conventional dies having a bottom side made of steel, which are likewise magnetically fastened on a magnetic embossing roller.Thermoplastic elastomers (=TPE) are understood to mean a group of materials which can be processed and recycled like thermoplastics but have similar properties and performance to those of thermosetting rubber materials. Preferably, thermoplastic elastomers have a hardness of 20 Shore A to 65 Shore D.Thermoplastic elastomers can preferably be block copolymers or thermoplastic elastomer compounds. Block copolymers are structures containing two different monomers in a single polymer chain. Examples of block copolymers are thermoplastic polyurethane, thermoplastic polyester, thermoplastic polyamide or thermoplastic block copolymer. Thermoplastic elastomer compounds are preferably produced by mixing elastomers and thermoplastics in the molten state. Examples of thermoplastic elastomer compounds are thermoplastic vulcanisators or thermoplastic polyolefins. Preferably, all thermoplastic elastomer types have two or more polymer phases, one hard and one soft. When solidified below the melting temperature, the hard regions of the various chains join to form hard thermoplastic parts, while the soft regions form elastomeric parts.In particular, it is provided that the film has a thickness in a range from 20 μm to 250 μm, in particular from 30 μm to 150 μm.It is preferably provided that the film, in particular on the side facing the first metal layer, has a film adhesive layer which is formed in particular from a pressure-sensitive adhesive (PSA). The film adhesive layer can alternatively also be multilayer and / or have a hot melt adhesive and / or a two-component adhesive. It is furthermore expedient if the film adhesive layer preferably has a layer thickness in a range from 0.01 mm to 1.0 mm, preferably from 0.05 mm to 0.5 mm, more preferably from 0.06 mm to 0.25 mm.In particular, it is provided that the die has a layer structure, in particular in the following sequence, starting with the layer facing the embossing roller:- film;optional film adhesive layer;- first metal layer;- adhesive layer;second metal layer.In other words, this means that the film forms the underside of the die and the second metal layer forms the upper side of the die. The term "upper side" is understood here to mean the side facing the substrate or the side facing the patrix.It can also be provided that the die has at least one elevation and / or depression, which corresponds in particular to the relief shape to be embossed in positive and / or negative form.It is preferably provided that the at least one elevation of the die has a height of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm, and / or that the at least one depression of the die has a depth of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm.In particular, it is provided that the at least one elevation and / or depression of the die has a shape selected from the group: round, flat, round-flat, flat-edged, prismatic, pointed or mixed shapes of these shapes.It can also be provided that the die is rounded, in particular that the die is deformed in such a way that the die has a rounding which substantially corresponds to the rounding of a magnetic embossing roller on which the die is arranged. For this purpose, it can be provided that the die is bent accordingly before being attached to the magnetic embossing roller.It is advantageous, in particular during the production of the at least one die, for the at least one elevation and / or depression to be engraved and / or milled, in particular by means of a computer-controlled engraving machine and / or a computer-controlled milling machine.It is also possible for the at least one elevation and / or depression to be produced photolithographically.Furthermore, it is possible that the at least one elevation and / or depression is produced by means of a laser, in particular by laser ablation.It has been shown here that, in particular during the production of the at least one die by means of a computer-controlled engraving machine and / or milling machine, dies can be produced which are distinguished by particularly good embossing results, in particular with which fine contours in the form of correspondingly embossed elevations and / or depressions of the substrate can be produced.Furthermore, it is advantageous in particular during the production of the die that the method further comprises the following step, which is carried out in particular before the step of producing the at least one elevation and / or depression in the surface of the die: - reducing the defined shape of the at least one elevation and / or depression in the surface of the die by a predetermined shortening factor, wherein the shortening factor is in particular between 0.95 and 1, preferably between 0.9750 and 0.999, more preferably between 0.98000 and 0.9999, even more preferably between 0.9000 and 0.9999. Advantageously, the predetermined shortening factor is determined depending on the diameter of the magnetic embossing roller and / or the counter-pressure roller. Furthermore, it is possible that the predetermined shortening factor is determined depending on the embossing length and / or a printing length, in particular on the substrate. It has been found here that the embossing result can be further improved by such a shortening factor, since in this way in particular a possible distortion or extension of the relief to be embossed can be compensated for in particular on account of the curvature of the embossing roller and / or of the counterpressure roller on the substrate.Furthermore, it is advantageous if the defined shape of the at least one elevation and / or depression in the surface of the die is distorted according to a predetermined distortion factor, in particular along a surface normal of the plane spanned by the die. It is thus possible for the at least one elevation and / or depression to have distortion, in particular along a surface normal of the plane spanned by the die.Exemplary embodiments of the invention are explained below by way of example with the aid of the appended figures, which are not to scale. FIGS. 1a to 1c schematically show an apparatus and a method for rotary blind embossing; FIG. 2 schematically shows a device for rotary blind embossing; FIG. 3 schematically shows a device for rotary blind embossing; FIG. 4 schematically shows a detail of the device, wherein in particular the positioning system is shown; FIG. 5 ashows schematically a sectional representation of a die; FIG. 5 bshows a schematic sectional illustration of a patrix;The figures show different examples of embodiments of the invention. Identical or identically acting components were each provided with the same reference symbols. Where the configurations illustrated in the figures have common features, it was omitted to avoid repetitions from describing these common features several times. The respective differences of the embodiments are described in each case with respect to the figures. It is self-evident that the person skilled in the art can modify individual configurations within the scope of protection of the claims or combine individual features of these configurations with one another.FIGS. 1 ato 1 cschematically show an apparatus 1 for rotary blind embossing.The device 1 for rotary blind embossing of a substrate 3 comprises a work station 1 awhich comprises a magnetic embossing roller 2 aand a counter-pressure roller 2 b, wherein at least one die 4 ais arranged magnetically on the magnetic embossing roller 2 aand at least one die 4 bis arranged on the counter-pressure roller 2 b, wherein the at least one die 4 ais formed in a multi-layered manner and has at least one first metal layer 8 made of a ferromagnetic material and that the at least one die 4 ahas a film 7 on the side facing the magnetic embossing roller 2 a.The film 7 on the side of the die 4 afacing the magnetic embossing roller 2 apreferably has the effect that the adhesive force of the die 4 aon the magnetic embossing roller 2 ais significantly increased, in particular is increased by up to 50% or more than 50%, compared to conventional dies having an underside made of steel, in relation to forces acting approximately tangentially. This is attributable in particular to the fact that the film 7, in particular which is formed from a thermoplastic elastomer, fits tightly against both the first metal layer 8 of the die 4 aand the outer periphery of the magnetic embossing roller 2 a. Air inclusions between die 4 aand magnetic embossing roller 2 aare thereby reduced, which leads to a "vacuum effect". In other words, this means that the die 4a has an increased adhesive force in the tangential direction, whereby a displacement of the die 4a during the embossing process and due to the tangential forces occurring during the embossing process is reduced or even completely prevented. Thus, the positional accuracy of the die 4a is maintained throughout the whole embossing cycle. Furthermore, the die 4a is nevertheless easy to remove from the magnetic embossing roll 2a by lifting it preferably radially from the embossing roll 2a. In this case, only the magnetic force of the magnetic embossing roller 2a has to be overcome. The effects of the increased adhesive force by the film 7 on the side of the die 4 afacing the surface of the magnetic embossing roller 2 atherefore occur only slightly or not at all in the radial direction of the magnetic embossing roller 2 a.By means of the device 1 shown in FIG. 1 a, as shown in FIGS. 1 ato 1 c, a method for rotary blind embossing of a substrate 3 in the workstation 1 acomprising a magnetic embossing roller 2 aand a counter-pressure roller 2 bis carried out, wherein the method comprises the following steps, in particular in the following sequence: a) providing a substrate 3; b) arranging at least one die 4 ato a magnetic embossing roller 2 a; c) arranging at least one male die 4 bto a counter-pressure roller 2 b; d) blind embossing of the substrate 3 by means of the at least one die 4 aand the at least one male die 4 b.In the embodiment shown in FIG. 1 a, the die 4 ais already arranged on the magnetic embossing roller 2 a. The arrangement of the die 4a is described in detail with reference to Fig. 4. Furthermore, in FIG. 1 a, the die 4 ais also already arranged on the counter-pressure roller 2 b. FIG. 1 athus shows the provision of the substrate 3. Subsequently, as shown in FIG. 1 b, the substrate 3 is embossed or blind-embossed by means of the die 4 aarranged on the magnetic embossing roller 2 aand the punch 4 barranged on the counter-pressure roller 2 b.As shown in FIG. 1 c, it is advantageous if, in the step shown in FIG. 1 b, the substrate 3 is blind-stamped in such a way that the substrate 3 has at least one elevation 5 aand / or depression 5 b.An elevation 5 aand / or depression 5 bof the substrate 3 is understood in particular as a relief shape which represents a pattern, motif or writing. A raised portion 5 aof the substrate 3 relative to an unprocessed region of the substrate 3 is preferably an embossing, such that the pattern, motif or writing is embossed in the substrate 3 in a raised manner. A depression 5 bof the substrate 3 relative to an unprocessed region of the substrate 3 is preferably an embossing, such that the pattern, motif or writing is embossed deep into the substrate 3. For example, in the case of a deep embossing, the elevation 5 aand / or depression 5 bshown in FIG. 1 c would be mirrored on the plane spanned by the substrate 3, i.e. the bulge of the substrate 3 would now point downward and not upward.It is furthermore advantageous if the at least one elevation 5 aand / or depression 5 bof the substrate 3 is produced with a height and / or depth of at least 0.01 mm, preferably at least 0.03 mm, more preferably at least 0.1 mm.As shown schematically in Figs. 1a to 1c, the ratio of the diameter of the magnetic embossing roller 2a to the diameter of the counter-pressure roller 2b is 1 to 1, but it is also possible that the magnetic embossing roller 2a and the counter-pressure roller 2b have different diameters. Thus, it is also possible that the ratio of the diameter of the magnetic embossing roller 2a to the diameter of the counter-pressure roller 2b is 1 to 2. Preferably, the diameter of the magnetic embossing pressure roller 2 ais between 100 mm and 450 mm, preferably between 200 mm and 350 mm, and / or the diameter of the counter pressure roller 2 bis between 200 mm and 800 mm, preferably between 400 mm and 700 mm. It is thus possible for the diameter of the magnetic embossing roller 2 ato be, for example, 300 mm±5 mm, preferably 298.4 mm±0.02 mm, and / or the diameter of the counterpressure roller 2 bto be, for example, 600 mm±5 mm, preferably 599.4 mm±0.02 mm.The substrate 3 is preferably provided as sheet material, as shown in FIGS. 1 ato 1 c. However, it is also possible for the substrate 3 to be provided as roll stock for processing roll-to-roll.Preferably, the substrate 3 comprises cellulose and / or plastics. Advantageously, the substrate 3 is paper, cardboard and / or films, in particular plastic films, or hybrid and / or composites of such materials.As indicated by the arrows in FIGS. 1 ato 1 c, the magnetic embossing roller 2 aand the counter-pressure roller 2 bare preferably driven in mutually opposite directions at mutually corresponding rotational speeds. In this case, the die 4 aand the male die 4 bpreferably engage in one another during each revolution in such a way that the substrate 3 located between the die 4 aand the male die 4 bis embossed, in particular in an overlap region of the die 4 aand the male die 4 b.By means of the device 1 shown in FIGS. 1 ato 1 c, it is possible for the substrate 3 to be embossed in such a way that the deviations between the embossings of each circulation are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.With regard to the arrangement of the die 4 aon the magnetic embossing roller 2 aand the punch 4 bon the counter-pressure roller 2 band the configuration of the die 4 aand the punch 4 b, reference is made here to details relating to FIG. 4 below.FIG. 2 schematically shows a device 1 for rotary blind embossing. The device 1 of FIG. 2 differs from the device 1 of FIGS. 1 ato 1 cin that three dies 4 aare arranged on the magnetic embossing roller 2 aand three male dies 4 bare arranged on the counter-pressure roller 2 bcorrespondingly. It is conceivable, among others, for the magnetic embossing roller 2 aand / or the counter-pressure roller 2 bto be equipped with such many dies 4 aand / or male dies 4 b, so that a large part of the circumferential surface or, as best as possible, the entire circumferential surface of the magnetic embossing roller 2 aand / or counter-pressure roller 2 bis equipped with dies 4 aand male dies 4 b, respectively.In the embodiment according to FIG. 2, too, the magnetic embossing roller 2 aand the counter-pressure roller 2 bare preferably driven in mutually opposite directions at mutually corresponding rotational speeds, wherein the dies 4 aand the male dies 4 bin each case engage in one another during each rotation in such a way that the substrate 3 located between the dies 4 aand the male dies 4 bis embossed, in particular in an overlap region of the dies 4 aand the male dies 4 b.FIG. 3 shows a further embodiment of a device 1 for the rotary blind embossing of a substrate 3. The apparatus 1 according to FIG. 3 substantially corresponds to the apparatus 1 according to FIG. 2, except that the apparatus 1 according to FIG. 3 comprises a transport device 11 which serves for transporting the substrate 3. It is thus possible, for example, for the transport device 11 to comprise a supply roll on which the substrate 3 is wound. Alternatively, it is also possible for the transport direction 11 to be configured for transporting substrate 3 in an arch shape.Furthermore, the apparatus 1 comprises the workstation 1 bfor printing on the substrate 3.Printing is preferably effected here by means of offset printing, screen printing, gravure printing, flexographic printing, relief printing or inkjet printing. It is further preferred if the pressure is generated by means of a pressure roller. During printing, one or more printing inks are advantageously applied to the substrate 3, in particular according to a grid.Furthermore, the apparatus 1 according to FIG. 3 comprises the workstation 1 afor rotary blind embossing of the substrate 3.Furthermore, the device 1 according to FIG. 3 comprises the work station 1 cfor grooving and / or folding the substrate 3. Preferably, the work station 1 ccomprises a pressing tool and / or folding tool for producing a sharp bending edge. In the case of grooving, the bending capacity of the substrate 3 is preferably changed by means of a pressing tool, in particular by material displacement. Folding is preferably understood to mean producing a sharp bending edge with the aid of a tool.Furthermore, the apparatus 1 comprises the work station 1 dfor severing the substrate 3. Advantageously, the work station 1 dcomprises a cutting tool. The substrate 3 is preferably cut by punching, wherein in particular the substrate 3 is cut by means of a cutting tool and / or punching tool.It is preferably expedient if the substrate 3 is processed continuously.It is also advantageous if the substrate 3 is provided as sheet material. It is further preferred here if the deviations between the embossings on the sheets of the substrate 3 provided as sheet material are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.As shown in Fig. 3, the work station 1b is disposed before the work station 1a comprising the magnetic embossing roller 2a and the back pressure roller 2b. The work stations 1c and 1d are arranged after the work station 1a comprising the magnetic embossing roller 2a and the counter-pressure roller 2b. However, other sequences of the work stations 1 a, 1 b, 1 c, 1 dare also conceivable. It is thus possible, for example, for the workstation 1 cto be arranged upstream of and / or the workstation 1 bto be arranged downstream of the workstation 1 aincluding the magnetic embossing roller 2 aand the counter-pressure roller 2 b.It is further advantageous if more than 8000 sheets per hour, preferably more than 10000 sheets per hour, more preferably more than 12000 sheets per hour, even more preferably more than 15000 sheets per hour, of the substrate 3 provided as a sheet material are processed by means of the apparatus 1 or by means of the method.FIG. 4 schematically shows a detail of the device 1, in which the positioning system 6 is shown. The positioning system 6 serves for arranging the at least one die 4 aor a plurality of dies 4 aon the circumferential surface of the magnetic embossing roller 2 a. As shown in FIG. 4, the positioning system 6 is arranged in the immediate vicinity of the magnetic embossing roller 2a. Furthermore, the positioning system 6 interacts with the magnetic embossing roller 2a. The position of the at least one die 4a in the radial direction of the magnetic embossing roller 2a is defined by the angle of rotation of the magnetic embossing roller 2a.Furthermore, the positioning system 6 comprises a displaceable stop 6 a, wherein the stop 6 apredicts the position of the at least one die 4 a. The stopper 6a may be, as shown in Fig. 4, a stopper 6a having two arms, the two arms being arranged at a right angle to each other. Depending on the shape of the die 4 a, the stop 6 acan, however, also be configured differently. As shown in Fig. 4, a die 4a, in this case a rectangular die 4a, can then be abutted against the stopper 6a and positioned and magnetically fixed on the magnetic embossing roller 2a, respectively.It is preferably provided that the at least one die 4 ais bent accordingly before being attached to the magnetic embossing roller 2 a, so that the rounding of the at least one die 4 asubstantially corresponds to the rounding of the magnetic embossing roller 2 a.Furthermore, the at least one die 4 ais preferably arranged on the magnetic embossing roller 2 asuch that the film 7 of the at least one die 4 afaces the surface of the magnetic embossing roller 2 a. This arrangement ensures a high holding or adhering force of the die 4a on the magnetic embossing roller in the tangential direction, whereby a displacement, in particular in the tangential direction, of the at least one die 4a is avoided.It is preferably provided that, on the basis of the arrangement of the at least one die 4 aon the magnetic embossing roller 2 a, the arrangement of the at least one punch 4 bon the counterpressure roller 2 btakes place subsequently, in particular in register or in register with the at least one die 4 a.For this purpose, it is preferably provided that at least one support plate is first arranged on the circumference of the counterpressure roller 2 b. It may also be possible for the counterpressure roller 2 bto have at least one carrier plate on its circumferential surface. Furthermore, the counter-pressure roller 2 bmay be configured to have two systems. In this case, approximately one system takes up approximately half of the circumferential surface of the counterpressure roller 2b. In this case, two support plates can thus be arranged on the counter-pressure roller 2 b.For the arrangement of the at least one patrix 4 b, at least one carrier plate can be arranged on the circumference of the counterpressure roller 2 b, wherein on the carrier plate at least one carrier plate can be arrangedI) a die box is arranged in which at least one corresponding male die 4 bis molded to the at least one female die 4 a; orII) at least one corresponding male die 4 bis arranged with respect to the at least one female die 4 a; orIII) is applied over the surface of a UV-curable plastic in which at least one corresponding male mold 4 bis molded to form the at least one female mold 4 a.According to the first variant I), it is preferably provided that a material cardboard sheet is arranged, in particular glued, on the carrier sheet, and preferably the material cardboard sheet is moistened, and the material cardboard sheet is embossed with the at least one die 4 aarranged on the magnetic embossing roller 2 ato form the at least one score in the material cardboard sheet. Moistening the material cardboard sheet makes it soft, so that the contour of the at least one die 4 acan be transferred into the material cardboard sheet with relatively low force. Moistening is preferably effected by means of a spray mist.During the embossing according to the first variant I), the material cardboard sheet is preferably compacted, in particular wherein the moisture is pressed out of the material cardboard sheet. As a result, the material cardboard sheet regains stability and the shaped contour of the at least one die 4 abecomes dimensionally stable. Furthermore, it can be provided that the magnetic embossing roller is heated, in particular with a temperature in the range of 25° C. to 50° C., preferably of 30° C. to 45° C., particularly preferably of 35° C. to 40° C., in order to dry the material cardboard sheet, so that the at least one patrix 4 bsolidifies.Alternatively, according to the second variant II), the at least one patrix 4 bmay be designed as a single patrix or each patrix 4 bmay be designed as a single patrix. The male die 4 bmay comprise materials, for example, individually or in combination selected from: plastic, silicone, rubber, brass. In other words, in this embodiment, the shape of the patrix 4 bis already incorporated, preferably produced by means of laser, photolithography, milling, in an additive printing process, such as 3D printing, etc. The shape of the patrix 4 bis preferably designed as a counterform to the at least one die 4 a.For fastening to the counterpressure roller 2 b, the at least one patrix 4 bis provided with a double-sided adhesive tape on its side facing the counterpressure roller 2 b. Furthermore, the at least one male die 4 bis also provided on its side facing the at least one female die 4 awith an adhesive, a double-sided adhesive tape or adhesive pieces. The male die 4 bis then glued positively onto the at least one female die 4 a. The magnetic counter-pressure roller 2 bis then brought into contact with the counter-pressure roller 2 b, in particular in such a way that the underside of the male die 4 b, in particular the side of the female die 4 bfacing the counter-pressure roller 2 b, is brought into contact with the carrier plate of the counter-pressure roller 2 b. The at least one patrix 4 bis now adhered to the counter-pressure roller 2 bby the double-sided adhesive tape. In this case, it is preferably provided that the adhesive force of the male die 4 bapplied to the side facing the counterpressure roller 2 bis stronger than the adhesive force of the side facing the female die 4 a, adhesive tapes or adhesives. This is because only in this way can the at least one male die 4 b be subsequently detached from the female die 4 a. Finally, any adhesive residues are removed both from the at least one die 4 aand from the at least one punch 4 b.In a further embodiment according to variant III), it can be provided that a UV-curable plastic is applied to the carrier sheet at least partially or over the entire surface, which is at least partially precrosslinked by means of a UV pre-curing light source, and then the precrosslinked UV-curable plastic is embossed by means of the at least one die 4 a, such that at least one male mold 4 bis introduced into the precrosslinked UV-curable plastic and finally the precrosslinked UV-curable plastic is fully cured by means of a UV final curing light source.FIG. 5 ashows schematically a sectional representation of a die 4 a. As can be seen in FIG. 5 a, the die 4 ais embodied in a multi-layered manner. The die 4a has the following layer structure, starting from the side facing the magnetic embossing roller 2a:- film 7;first metal layer 8;- adhesive layer 9;second metal layer 10.The side facing the magnetic embossing roller 2a is preferably the underside of the die 4a. Thus, the die 4 aaccording to FIG. 5 a has a foil 7 on its underside.The film 7 is preferably a plastic film. The film 7 is preferably or comprises a thermoplastic elastomer. As already described above, a thermoplastic elastomer is a plastic which has both properties of a thermoplastic and of a thermosetting plastic. This has the effect that the film 7 fits tightly against the first metal layer 8 of the die 4 aand also against the surface of the magnetic embossing roller 2 aand thus forms a kind of "vacuum effect". This ensures an increased adhesion or holding force of the die 4 aon the surface of the magnetic embossing roller 2 awith respect to a force effect in the tangential direction.It is preferably provided that the film 7 has a film adhesive layer which is formed in particular from a pressure-sensitive adhesive (PSA). The film adhesive layer can alternatively also be multilayer and / or have a hot melt adhesive and / or a two-component adhesive. It is furthermore expedient if the film adhesive layer preferably has a layer thickness in a range from 0.01 mm to 1.0 mm, preferably from 0.05 mm to 0.5 mm, more preferably from 0.06 mm to 0.25 mm. For the sake of better illustration, the film adhesive layer is not shown in FIG. 5 a. The film adhesive layer can preferably be applied during the production of the film and is preferably a part of the film.The first metal layer 8 is formed from a ferromagnetic material. Preferably, the first metal layer 8 comprises a material or combinations of materials selected from: iron, steel, ferrites, cobalt and / or nickel. In the die 4a shown in Figure 5a, a first metal layer 8 of steel is used.The second metal layer 10 preferably comprises a material or combinations of materials selected from: brass, bronze, copper, nickel, zinc, tin, lead, iron and / or steel. In the die 4 ashown in FIG. 5 a, the second metal layer 10 is formed from brass, for example. The embossing mold is preferably molded into the second metal layer 10 as a positive or negative mold, in particular comprising elevations 12 aand / or depressions 12 b.The elevation 12 aand / or depression 12 bmay be engraved and / or milled, for example, by means of a computer-controlled engraving machine and / or by means of a computer-controlled milling machine. For this purpose, the relief shape is preferably first defined and designed with the aid of a computer. The design can be effected manually or by means of predetermined relief shapes. Subsequently, on the basis of this configuration, a data set is preferably generated which contains the relief shape and the data set is transmitted to the computer-controlled engraving machine and / or milling machine. Subsequently, the elevations 12 aand / or depressions 12 bare engraved and / or milled in the die 4 a, in particular depending on the data set.Alternatively, it is also possible for the elevations 12 aand / or depressions 12 bto be produced photolithographically.Furthermore, it is also possible for the elevations 12 aand / or depressions 12 bto be produced by means of a laser, in particular by laser ablation. Preferably, during laser ablation, the material of the die 4 ais completely ablated and / or ablated.The laser is preferably a gas laser, in particular a CO 2- laser, and / or a solid state laser, in particular an Nd:YAG laser. The laser power is advantageously at least 20 W, preferably at least 30 W, more preferably at least 100 W. Furthermore, it is advantageous if the wavelength of the laser is between 9.35 μm and 10.25 μm.Preferably, the laser beam is directed along the die 4 aby means of deflectable mirrors, in particular by means of a laser scanning module, such that the desired elevations 12 aand / or depressions 12 bare produced. The beam diameter of the laser is here in particular between 0.01 mm and 1 mm, preferably between 0.01 mm and 0.2 mm, at the focal point.Furthermore, it is advantageous in particular during the production of the die 4 aand / or male die 4 bto reduce the desired relief shape to be embossed by a predetermined shortening factor, in particular before the production of the elevations 12 aand / or depression 12 bin the surface of the die 4 aand / or male die 4 b. Preferably, the shortening factor is in particular between 0.95 and 1, preferably between 0.9750 and 0.9999, more preferably between 0.98000 and 0.99999, even more preferably between 0.99000 and 0.9999. Advantageously, the predetermined shortening factor is determined depending on the diameter of the embossing roller 2 aand / or the counter-pressure roller 2 b. Furthermore, it is possible that the predetermined shortening factor is determined depending on the embossing length and / or a printing length, in particular on the substrate 3.Preferably, the elevations 12 aand / or depressions 12 bare introduced in flat states of the die 4 aand the die 4 ais subsequently deformed in such a way that the die 4 ahas a rounding which substantially corresponds to the rounding of the magnetic embossing roller 2 aand / or the rounding of the counterpressure roller 2 b.As shown in FIG. 5 a, an adhesive layer 9 is provided between the first metal layer 8 and the second metal layer 10.It is furthermore advantageous if the adhesive layer 9 is a hot-melt adhesive or cold-melt adhesive layer.It is thus also possible for the adhesive layer 9 to be a two-component adhesive (2K adhesive), in particular comprising epoxy resins. The adhesive layer 9 is preferably an epoxy-based 2K adhesive system, such as, for example, Araldite from Huntsman, Salt Lake City, Utah, USA.It is also advantageous if the adhesive layer 9 is a double-sided adhesive tape. The double-sided adhesive tape is preferably coated on two sides with a pressure-sensitive adhesive (PSA). Such double-sided adhesive tapes can be obtained, for example, from Tesa, Norderstedt, Germany.It is furthermore expedient if the adhesive layer 9 preferably has a layer thickness in a range from 0.01 mm to 1.0 mm, preferably from 0.05 mm to 0.5 mm, more preferably from 0.06 mm to 0.25 mm.The die 4 aaccording to FIG. 5 apreferably has a thickness of between 0.1 mm and 5 mm, preferably between 0.5 mm and 3 mm.Furthermore, the die 4 aaccording to FIG. 5 acomprises at least one elevation 12 aand / or depression 12 b, which corresponds in particular to the relief shape to be embossed in positive and / or negative form.It is preferably provided that the at least one elevation 12 aof the die 4 ahas a height of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm, and / or that the at least one depression 12 bof the die 4 ahas a depth of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm.FIG. 5 bshows a schematic sectional illustration of a patrix 4 b. The male die 4 bis designed as a counter-die to the female die 4 ashown in FIG. 5 a. As can be seen in FIG. 5 b, the patrix 4 bis of single-layer configuration. As described above, this can be produced or formed according to one of the variants I), II) or III).List of reference characters1 Device 1 a, 1 b, 1 c, 1 d Arbeitsstation stations 2 a Magnetische embossing roller 2 b Gegendruck roller 3Substrate 4 a Matrize 4 b Pa 5 a Erhöhung of the substrate 5 b Vertiefung of the substrate 6 Positioning system 6 aStop 7 Film 8 First metal layer 9 Adhesive layer 10 Second metal layer 11 Transport device 12 a Of the die / punch 12 b Of the die / punch

Claims

Device (1) for rotary blind embossing of a substrate (3), wherein the device (1) comprises a work station (1a) which comprises a magnetic embossing roller (2a) and a counter-pressure roller (2b), wherein at least one die (4a) is arranged magnetically on the magnetic embossing roller (2a) and at least one die (4b) is arranged on the counter-pressure roller (2b), wherein the at least one die (4a) is of multilayer design and has at least one first metal layer (8) made of a ferromagnetic material, characterized in that the at least one die (4a) has a film (7) on the side facing the magnetic embossing roller (2a).Device (1) according to Claim 1, characterized in that the magnetic embossing roller (2a) has a permanent magnet and / or in that the magnetic embossing roller (2a) is designed as a magnetic cylinder.Device (1) according to claim 1 or 2, characterised in that the magnetic embossing roller (2a) is temperature-controlled, in particular wherein the magnetic embossing roller (2a) has a temperature in the range of from 25°C to 50°C, preferably from 30°C to 45°C, particularly preferably from 35°C to 40°C.Device (1) according to one of the preceding claims, characterized in that the impression roller (2b) has a permanent magnet and / or in that the impression roller (2b) is designed as a magnetic cylinder.Device (1) according to one of the preceding claims, characterized in that at least one carrier plate is arranged on the circumference of the counterpressure roller (2b), wherein a material board is arranged on the carrier plate I), in which board board at least one corresponding male die (4b) is shaped to the at least one female die (4a); or II) at least one corresponding male die (4b) is arranged to the at least one female die (4a); or III) a UV-curable plastic is applied over the surface, in which plastic at least one corresponding male die (4b) is shaped to the at least one female die (4a).Device (1) according to one of the preceding claims, characterized in that the magnetic embossing roller (2a) and the counter-pressure roller (2b) can be driven in mutually opposite directions at mutually corresponding rotational speeds.Device (1) according to one of the preceding claims, characterized in that the ratio of the diameter of the magnetic embossing roll (2a) to the diameter of the counter-pressure roll (2b) is 1 to 2, preferably 1 to 1.Device (1) according to one of the preceding claims, characterized in that the at least one die (4a) is deformed in such a way that the at least one die (4a) has a rounding which substantially corresponds to the rounding of the magnetic embossing roller (2a).Device (1) according to any one of the preceding claims, characterized in that the first metal layer (8) comprises a material or combinations of materials selected from: iron, ferrites, cobalt and / or nickel.Device (1) according to any one of the preceding claims, characterized in that the die (4a) comprises a second metal layer (10), in particular wherein the second metal layer (10) comprises a material or combinations of materials selected from: brass, bronze, copper, nickel, zinc, tin, lead, iron and / or steel.Device (1) according to one of the preceding claims, characterized in that the die (4a) comprises an adhesive layer (9).Device (1) according to one of the preceding claims, characterized in that the film (7) is or comprises a plastic film, in particular wherein the film (7) is formed from a thermoplastic elastomer.Device (1) according to one of the preceding claims, characterized in that the film (7), in particular on the side facing the first metal layer (8), has a film adhesive layer.Device (1) according to one of the preceding claims, characterized in that the at least one die (4a) has a layer structure, in particular in the following sequence, starting with the layer facing the magnetic embossing roller (2a): - film (7); - optional film adhesive layer; - first metal layer (8); - adhesive layer (9); - second metal layer (10).Device (1) according to one of the preceding claims, characterized in that the at least one die (4a) and the at least one male die (4b) are arranged in such a way that, during each revolution, they engage in one another in such a way that the substrate (3) located between the at least one die (4a) and the at least one male die (4b) can be embossed, in particular in an overlap region of the at least one die (4a) and the at least one male die (4b).Device (1) according to one of the preceding claims, characterized in that the at least one die (4a) and / or the at least one punch (4b) has at least one elevation (12a) and / or depression (12b), which corresponds in particular to the relief shape to be embossed in positive and / or negative form.Device (1) according to one of the preceding claims, characterized in that the device (1) comprises a positioning system (6) for arranging the at least one die (4a) on the magnetic embossing roller (2a), wherein the positioning system (6) has a stop (6a).Device (1) according to claim 17, characterised in that the positioning system (6) is arranged in the immediate vicinity of the magnetic embossing roller (2a) and interacts with the magnetic embossing roller (2a).Device (1) according to claim 17 or 18, characterised in that the position of the at least one die (4a) in the radial direction of the magnetic embossing roller (2a) can be defined via the angle of rotation of the magnetic embossing roller (2a), and the position of the at least one die (4a) in the axial direction of the magnetic embossing roller (2a) can be defined via the position of the stop (6a).Device (1) according to one of the preceding claims, characterized in that the device (1) further comprises one or more further work stations (1b, 1c, 1d) for printing on the substrate (3) and / or for cold embossing the substrate (3) and / or for hot embossing the substrate (3) and / or for Braille blind embossing the substrate (3) and / or for severing, in particular cutting, the substrate (3) and / or for grooving and / or folding the substrate (3).Device (1) according to claim 20, characterised in that the one or more further work stations (1b, 1c, 1d) are arranged before and / or after the work station (1a) comprising the magnetic embossing roller (2a) and the counter-pressure roller (2b).Die (4a), in particular for use in a device (1) according to one of the preceding claims, wherein the die (4a) is of multilayer design and has at least one first metal layer (8) made of a ferromagnetic material, characterized in that the die (4a) has a film (7) on its underside.Die (4a) according to claim 22, characterized in that the first metal layer (8) comprises a material or combinations of materials selected from: iron, steel, ferrites, cobalt and / or nickel.Die (4a) according to claim 22 or 23, characterized in that the die (4a) comprises a second metal layer (10), in particular wherein the second metal layer (10) comprises a material or combinations of materials selected from: brass, bronze, copper, nickel, zinc, tin, lead, iron and / or steel.Die (4a) according to one of Claims 22 to 24, characterized in that the die (4a) comprises an adhesive layer (9).Die (4a) according to one of Claims 22 to 25, characterized in that the film (7) is or comprises a plastic film, in particular wherein the film (7) is formed from a thermoplastic elastomer.Die (4a) according to one of Claims 22 to 26, characterized in that the film (7) has a thickness in a range from 20 μm to 250 μm, in particular from 30 μm to 150 μm.Die (4a) according to one of Claims 22 to 27, characterized in that the film (7), in particular on the side facing the first metal layer (8), has a film adhesive layer.Die (4a) according to one of Claims 22 to 28, characterized in that the die (4a) has a layer structure, in particular in the following sequence, starting with the layer facing the embossing roller (2a): - film (7); - optional film adhesive layer; - first metal layer (8); - adhesive layer (9); - second metal layer (10).Die (4a) according to one of Claims 22 to 29, characterized in that the die (4a) has a thickness of between 0.1 mm and 5 mm, preferably between 0.5 mm and 3 mm.Die (4a) according to one of Claims 22 to 30, characterized in that the die (4a) has at least one elevation (12a) and / or depression (12b), which corresponds in particular to the relief shape to be embossed in positive and / or negative form.Die (4a) according to Claim 31, characterized in that the at least one elevation (12a) of the die (4a) has a height of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm, and / or in that the at least one depression (12b) of the die (4a) has a depth of at most 5.0 mm, preferably of at most 3.0 mm, further preferably of at most 1.0 mm, even further preferably of at most 0.5 mm.Die (4a) according to Claim 31 or 32, characterized in that the at least one elevation (12a) and / or depression (12b) of the die (4a) has a shape selected from the group: round, flat, round-flat, flat-edged, prismatic, pointed or mixed shapes of these shapes.Die (4a) according to one of Claims 22 to 33, characterized in that the die (4a) is rounded, in particular in that the die (4a) is deformed in such a way that the die (4a) has a rounding which substantially corresponds to the rounding of a magnetic embossing roller (2a) on which the die (4a) is arranged.Method for rotary blind embossing of a substrate (3) using a device (1) according to one of claims 1 to 21, wherein the method comprises the following steps, in particular in the following order: a) providing a substrate (3); b) arranging at least one die (4a), in particular according to one of claims 22 to 34, on a magnetic embossing roller (2a); c) arranging at least one male die (4b) on a counter-pressure roller (2b); d) blind embossing of the substrate (3) by means of the at least one die (4a) and the at least one male die (4b).Method according to claim 35, characterised in that in step b) the arrangement of the at least one die (4a) takes place by means of a positioning system (6) comprising a displaceable stop (6a), in that the positioning system (6) interacts with the embossing roller (2a) in such a way that the embossing roller (2a) is rotated by a predefined angle of rotation in order to define the position of the at least one die (4a) in the radial direction of the magnetic embossing roller (2a), and in that the stop (6a) defines the position of the at least one die (4a) in the axial direction of the magnetic embossing roller (2a).Method according to claim 36, characterised in that in step b) the at least one die (4a) is placed along the stop (6a) and subsequently magnetically fastened to the surface of the magnetic embossing roll (2a).Method according to one of Claims 35 to 37., characterized in that, before step b) or in step b), the at least one die (4a) is bent, in particular such that the rounding of the at least one die (4a) substantially corresponds to the rounding of the magnetic embossing roller (2a).Method according to one of Claims 35 to 38, characterized in that, in step b), the at least one die (4a) is arranged on the magnetic embossing roller (2a) in such a way that the film (7) faces the surface of the magnetic embossing roller (2a).Method according to one of Claims 35 to 39, characterized in that, in step c), at least one support plate is firstly arranged on the circumference of the counterpressure roller (2b).Method according to claim 40, characterised in that in step c) according to a first variant I) a sheet of material is arranged, in particular glued, on the carrier sheet, and preferably the sheet of material is moistened, and the sheet of material is embossed with the die (4a) arranged on the magnetic embossing roller (2a) in order to form the at least one score in the sheet of material.Method according to claim 41, characterised in that in step c) during embossing according to the first variant I) the material cardboard sheet is compacted, in particular wherein the moisture is forced out of the material cardboard sheet.Method according to claim 41 or 42, characterised in that in step c) during embossing according to the first variant I) the magnetic embossing roller (2a) is heated, in particular with a temperature in the range of 25°C to 50°C, preferably of 30°C to 45°C, particularly preferably of 35°C to 40°C, in order to dry the cardboard sheet, so that the at least one patrix (4b) solidifies.Method according to one of Claims 35 to 40, characterized in that, in step c), according to a second variant II), the at least one male die (4b) is provided on its side facing the counterpressure roller (2b) with a double-sided adhesive tape.Method according to claim 44, characterised in thatthe male die is positively bonded to the at least one die (4a) by means of an adhesive or adhesive tape or adhesive pieces in step c) according to the second variant II), and the at least one male die (4b) is subsequently applied to the counterpressure roller (2b), in particular by bringing the embossing roller (2a) into contact with the counterpressure roller (2b).Method according to claim 40, characterised in that in step c) according to a third variant III) a UV-curable plastic is applied to the carrier sheet at least partially or over the entire surface, which is at least partially precrosslinked by means of a UV pre-curing light source, and subsequently the precrosslinked UV-curable plastic is embossed by means of the at least one die (4a), so that at least one male die (4b) is introduced into the precrosslinked UV-curable plastic and finally the precrosslinked UV-curable plastic is fully cured by means of a UV final curing light source.Method according to one of Claims 35 to 46, characterized in that, in step d), the substrate (3) is blind-stamped in such a way that the substrate (3) has at least one elevation (5a) and / or depression (5b).Method according to one of Claims 35 to 47, characterized in that the at least one elevation (5a) and / or depression (5b) of the substrate (3) in step d) is produced with a height and / or depth of at least 0.01 mm, preferably at least 0.03 mm, more preferably at least 0.1 mm.Method according to one of Claims 35 to 48, characterized in that the magnetic embossing roller (2a) and the counterpressure roller (2b) are driven in mutually opposite directions at mutually corresponding rotational speeds.Method according to one of Claims 35 to 49, characterized in that the at least one die (4a) and the at least one male die (4b) engage one inside the other during each revolution in such a way that the substrate (3) located between the at least one die (4a) and the at least one male die (4b) is embossed, in particular in an overlap region of the at least one die (4a) and the at least one male die (4b).Method according to any one of claims 35 to 50, characterised in that the substrate (3) is embossed so that the differences between the embossings of each revolution are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.Method according to any of the preceding claims 35 to 51, characterized in that the method further comprises the steps of: - feeding the substrate (3) to the work station (1a) comprising the magnetic embossing roller (2a) and the counter-pressure roller (2b).Method according to one of the preceding claims 35 to 52, characterized in that the method further comprises at least one of the following steps, which are carried out in one or more further work stations (1b, 1c, 1d): - printing the substrate (3); - cold embossing the substrate (3); - hot embossing the substrate (3); - Braille blind embossing the substrate (3); - severing, in particular cutting, the substrate (3); - grooving and / or folding the substrate (3).Method according to one of the preceding claims 35 to 53, characterized in that the substrate (3) is processed continuously.Method according to one of the preceding claims 35 to 54, characterized in that in step a) the substrate (3) is provided as sheet material.Method according to any of claims 35 to 55, characterized in that the deviations between the embossings on the sheets of the substrate (3) provided as sheet material are less than 2% percent, preferably less than 1% percent, even more preferably less than 0.05% percent.Method according to one of Claims 35 to 56, characterized in that more than 8000 sheets per hour, preferably more than 10000 sheets per hour, more preferably more than 12000 sheets per hour, even more preferably more than 15000 sheets per hour, of the substrate (3) provided as sheet material are processed by means of the method.

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