CH701535A1 - Device for applying color effect pigments. - Google Patents

Abstract

A device (1) for applying a paint to a substrate web (3) guided past the device (1) along a running direction (12) is described. The device is characterized in that it has a plane in the running direction (12) convex and perpendicular to the running direction (12) straight formed area (28), which can be brought into contact with the substrate web (3), and that in the convex surface area (28) one, preferably at least two separately controllable with color, in a direction perpendicular to the running direction (12) offset passage openings (6) are provided for the color through which the ink is applied directly to the substrate web (3), wherein the order quantity the color is dependent on the angle of attack between the plane of the substrate web (3) and the normal to a tangential plane on the surface region (28) at the location of the respective passage opening (6).

Description

TECHNICAL AREA

The present invention relates to a device in particular for the application of color effect pigments such as iridescent pigments, processes for applying in particular such pigments with such a device and print carrier produced with the aid of such methods.

STATE OF THE ART

It is known, inter alia, from EP 490 825 that it is possible to apply iridescent pigments in the form of strips to a substrate, for example a paper for banknotes, these strips having different colors of the pigments. Such strips are used, for example, in security documents such as banknotes, passports, identification cards, visa labels, tickets, postage stamps, tax stamps, certificates, birth certificates, vehicle identity cards, bill of lading, guarantee certificates, labels and similar documents, since the color-changing effect of these strips is due to modern reproduction methods, for example Color copiers, color scanners, color printers, digital cameras and similar methods can be adjusted only insufficiently.

For the application of these strips on the one hand a device is proposed in which on a application roller with the aid of individual pipette-like devices, the corresponding pigmented color is first applied to the roll and then on the roll, which rests on the substrate web and with this runs along, is applied to the substrate web.

Alternatively, it is proposed, also with such a role, the individual colors in individual areas which are separated with walls to apply to the substrate. Problematic in connection with such application of color effect pigments e.g. With iridescent pigments it is, inter alia, that the number of individual stripes arranged in the immediate vicinity of each other, i. directly adjacent to each other or by distances from each other spaced individual strips, is limited in the proposed construction to a few and the width, also due to design, a certain level can not fall below. As a result, the number of individual strips arranged in direct proximity to one another is limited. Another problem is associated with such application of color effect pigments e.g. among other things, with iridescent pigments is that the application process can be insufficiently controlled in terms of application amount, stripe width, etc., which may include: regarding the often temperature-dependent viscosity of the colors for the process stability is problematic. This is particularly the case when a plurality of strips and / or strips of small width to be applied.

PRESENTATION OF THE INVENTION

It is inter alia an object of the invention to propose an improved apparatus for the application of a paint to a substrate, in particular in connection with the application of color effect pigments, e.g. iridescent pigments, on substrates for example for the production of security documents. Color effect pigments are pigments whose optical effect comes about through normal reflection or interference. The color changes in such pigments depending on the viewing angle and / or as a function of the angle of the incident light. The pigments used for this purpose are typically optically anisotropic particles which, when applied as a color layer, are anisotropically distributed in a support or a matrix in space. The application process should proceed in such a way that the pigments in the color layer are not distributed isotropically in their spatial orientation at the end, since otherwise the color change effect does not occur or occurs only to a small extent.

It is further object of the invention to provide a device for applying a color to a substrate, which allows a variety of fine (ie small width), applied in direct proximity to each other arranged single lines in different colors. An essential advantage of this device, in contrast to the devices known in the prior art, is that it opens up the possibility of creating a multiplicity of color combinations, which form a color code, which are used for the identification of documents, by the multiplicity of single strokes in different colors can.

The invention relates, inter alia, to a device for the application of a color to a guided along a direction of travel on the device substrate web. The device is according to the invention, characterized in that it has a preferably convex in running direction and perpendicular to the running direction formed surface area, which can be brought into contact with the substrate web, and that in the convex surface area one, preferably at least two separately with color controllable, offset in a direction perpendicular to the direction of passage openings for the color are provided, through which the ink is applied directly to the substrate web. In this case, due to the convex surface of the device, the application amount of the color depends on the angle of attack of the device with respect to the substrate. Specifically, the application amount is dependent on the smallest height of the gap substantially at the contact line between the paper web and the coating head contour or behind, and the coating contour at this lowest point can with the angle of attack between the plane of the substrate web and the normal to a tangent plane at the surface area at the Position of the respective passage opening can be varied.

Instead of a convex formation in the surface area, a flat plane is conceivable, e.g. using a square head, Also possible are stepped areas.

In addition, it should be mentioned that the order amount is also influenced by other parameters, so U.a. from the viscosity of the coating color, the hydrostatic pressure, which relies on the application of the coating color at the place of application, the web speed, the contact pressure of the device on the substrate web, the depth of the depressions (see below), etc. Since these parameters are can change over time, for example, the viscosity of the color can change depending on the ambient temperature, the inventive device provides an extremely comfortable solution to compensate for such difficult to control changes by adjusting the angle of attack in a simple manner. Known devices and methods do not allow a similarly simple correction.

A holder for such devices, which allows a corresponding adjustment of the angle of attack is quite generally preferably constructed so that the device can be rotated therein about its central axis (that is, for adjusting the angle of attack about an axis perpendicular to the conveying direction of the substrate web) , and preferably additionally can be moved transversely to the direction of travel over the substrate web (for example, to determine different transverse positions or even for the generation of wavy lines as a function of time variable), and can be lowered perpendicular to the paper web. By the vertical lowering it is possible to press the device onto the substrate web, which is underlaid from its underside with a counter-pressure element. The pressing force with which the device is pressed onto the substrate web and the counterpressure element is, for example, in the range from 0 to 300 N, preferably in the range from 20 to 150 N, in particular preferably in the range from 50 to 70 N.

In particular, if, as preferred, the passage opening is a circular bore, resulting due to the convex plane through which the passage opening passes, curved in space contour line of the passage opening. As a result of this convex curvature, inter alia, the dependence of the color applied on the substrate by this opening arises from the angle of attack of the device with respect to the substrate web. Such an angle of attack can easily be realized with such a device (corresponding suspension of the entire device or at least its convex surface, in which the angle of attack can be adjusted either manually or automatically), and the angle of attack allows a targeted control of the order quantity of the applied color.

A first preferred embodiment is characterized in that in the region of at least one, preferably each passage opening in the surface area a recess is arranged, which widens the passage opening in the running direction with a depth. The depth of such a depression is typically in the range of at most 3 mm, for example in the range of 0.05-2 mm, preferably in the range of 0.1-1 mm, particularly preferably in the range of 0.1-0.5 mm. The recess is either substantially equal in width (transverse to the direction of travel) to the diameter of the passage opening, but it may also, and is preferred for certain applications, be greater than the diameter of the passage opening measured in a direction perpendicular to the direction of travel. In principle, namely, the passage opening may be circular, but it may also be oval, wherein preferably the long main axis is arranged perpendicular to the direction and the short main axis parallel to the direction.

According to a further preferred embodiment, the recess is formed in the direction of running expiring, preferably over the entire width of the recess. The recess can also be closed at least partially in the direction of travel to the rear, so it may be formed, for example in the form of a pot-like milling.

In principle, such a recess can be made by a corresponding milling tool is introduced into the material of the convex surface in the region of the passage opening to the desired depth at this point and is then guided backwards out of the device to form the recess. If the milling tool is guided completely backwards out of the device, the linear outlet edge described above is formed at the location where the milling tool leaves the workpiece, which recess is designed to extend over the entire width. If the milling tool previously led out of the material, the said pot-like depression is formed.

The webs between the wells of adjacent passages may extend to the exit edge of the wells, but they may also end earlier, so that connect in the region of the exit edge, the wells of adjacent passage openings together. The webs may extend in the form of webs of constant width parallel to the transport direction of the substrate web. However, they can also be designed to converge towards the rear (successively decreasing width, possibly even to a point in front of the trailing edge). In addition to reducing the height of the trailing edge above the substrate web and thus the amount of application is then accompanied by a change in the angle of attack and a change in the outlet width.

A further preferred embodiment is characterized in that the device is formed at least in the area as part of a circular cylinder through the cylinder surface pass through the passages. The radius of such a cylinder surface is in the range of 3-50 mm, more preferably in the range of 3-15 mm, more preferably in the range of 4-10 mm. Preferably, the device comprises an entire circular cylinder. In particular, when using an entire circular cylinder radii preferably in the range of 3-15 millimeters, particularly preferably in the range of 4-10 millimeters are used. This circular cylinder can then be formed as a solid, preferably made of metal (for example steel, copper, brass) circular cylinder whose axis is arranged parallel to the plane of the substrate web and perpendicular to the direction in which the passage openings are formed as central through-holes. Since the temperature can typically increase during application due to the friction between the device and the substrate web, it may be advantageous to provide means in the circular cylinder for temperature control, for example in the form of channels for a corresponding liquid or a gaseous medium for tempering.

A further preferred embodiment is characterized in that the side openings of the through openings Blind milling - so non-ink-carrying depressions - are arranged. Typically, the passage openings are preferably arranged in a line next to one another. In particularly fine areas, it may also be advantageous to offset the passage openings alternately in the running direction against each other to create enough space for the ink supply.

Preferably, a counterpressure body is arranged on the side of the substrate opposite the device, which is designed to be flexible in order to ensure homogeneous contact pressure across the width of the device. By means of this counter-pressure element, further possible tolerances of the substrate thickness occurring in the case of paper, in particular in the region of watermarks, can be compensated. In particular, if such a soft counter-pressure body is used, it may happen that the substrate bulges into the device to some extent, where it comes into contact with the device. This can lead to the paint application being greater in the laterally arranged regions than in the central regions, because there the curvature forces the substrate less strongly into the device than in the centrally arranged regions. This effect can be significantly reduced by the mentioned blind milling.

As a counter-pressure body can be provided a follower structure (role) or a stationary structure on which the substrate web slides. The surface of this body can be made of a soft resilient material, such as plastic or felt, a brush structure is possible. In the case of felt as a stationary counterpressure body, for example, a felt with a bulk density (according to DIN 53855) in the range of 0.15-0.6 kg / dm 3, preferably in the range of 0.2-0.4 kg / dm 3, proves to be suitable.

It is also possible to equip the device with a variety of areas, which are color-connected depending on the application or receive no color guide. For example, a device with 10 areas for applying single strokes can be used to apply any number between 1 to 10 individual strokes, depending on which areas are supplied with color.

Further, it may happen that the edge sharpness of the outermost regions, which do not adjoin at its outer boundary line to a further adjacent color region, do not have the same edge sharpness, as two adjoining regions. In this case, it may prove useful to provide laterally each a further area that applies a non-pigmented and therefore colorless formulation as a line. Thus, it can be ensured that all colored areas have a comparable edge sharpness.

Further, generally formulations can be applied, which are also colorless in daylight, but have hidden properties, for example, by the addition of fluorescent dyes fluorescence in the ultraviolet light show or by admixture of liquid crystalline pigments when viewed through a polarizing filter to light. It is also possible to incorporate pigments having polarized absorption and / or emission properties, analogous to that described in PCT / GH2005 / 000 380, respectively. EP05 754 354.8 subject invention. A further preferred embodiment is characterized in that in the region of at least one, but preferably each passage opening in the surface area a recess is arranged, which expands the passage opening in the running direction with a depth that the recess is formed in the running direction expiring, and that the recesses of adjacent passage openings not separated by a web at least in the region of a common exit edge. In other words, the recesses connect either at the trailing edge or even before it. Surprisingly, this results in no significant mixing of the individual coating colors, although these are not separated by a bridge over a certain distance. On the contrary, in this preferred embodiment directly adjacent to each other areas with very high edge sharpness.

However, it is possible, if desired, under certain circumstances, a targeted intermingling of the colors in the area to effect. The corresponding mixed colors can be used for example for the production of rainbow-like structures. This can be provoked, for example, in that the adjacent areas are pressed together before leaving the coating head. A corresponding embodiment will be given below. This is possible, for example, when the angle of attack or the contour in the contact area of the coating head is selected so that the color does not escape backwards from the coating head onto the substrate, but to some extent protrudes forward (against the running direction), in front of the coating head forms an accumulation or stagnation, where adjacent color areas can merge into each other in contact areas, and only after this process on the substrate, the color then overflowing in the edge areas is transported under the coating head past. Such a situation is preferred in particular when the recess is not directed backward but forward, which corresponds to a further preferred embodiment. In general, a cellulose-based substrate such as paper is preferably used as the substrate. Preference is given to a security paper which in turn may already have security features such as watermarks, mottled fibers, etc. Such a substrate can then be assembled into a security print carrier, and further processed, for example, into a banknote or a security document.

Of course, other substrates, such as films, composite films, as well as other printing substrates, in particular security printing substrates, come as a carrier in question. In a preferred embodiment, substrates are used which are at least partially transparent (windows), and coatings are preferably applied with the device according to the invention in these transparent areas. When pigments are used which have different absorption and transmission characteristics, interesting effects arise on such transparent substrates, such as, for example, color inversion when viewing is changed from top view to review.

Preferably, such a device finds in connection with a color with color effect pigments, i. E. Color change or effect pigments, so-called color-changing or color-shifting pigments or optically variable pigments, in particular iridescent or so-called pearlescent pigments. An overview of such pigments are, for example, Optical Security and Counterfeit Deterrence Techniques IV, SPIE 4677, 2002 and the references cited therein. Such pigments have angle-dependent reflection properties and therefore exhibit different reflection colors at different viewing angles. Examples of such pigments are Iriodin® from Merck GmbH, Phoenix from Eckart, Xymara and Metasheen from Ciba, Firemist from BASF, SunGEM from Sun Chemical, QolorTech Pearl from QolorTech, Helicone from Wacker, SpecialDiamond from SpecialChem, Taizhu Pearl Pigments from Wenzhou Pearlescent Pigments Co LTD, as well as ChromaFlair, SpectraFlair, and other Flex Products, Inc. products, just to name a few.

In order to be applied with such a device, this color preferably has a viscosity in the range of 20-70 mPas, preferably in the range of 35-60 mPas, particularly preferably in the range of 40-55 mPas. The colors are preferably supplied to the device from a first storage vessel, which in turn is fed via a second storage vessel, for example via peristaltic pumps, and wherein the first storage vessel has an overflow which returns the overflowing paint to the second storage vessel. The feeding is preferably carried out in abundance, so that the level of color in the first storage vessel and thus the hydrostatic pressure of the color, by the height difference of the first storage vessel and device, remains almost constant. A further preferred embodiment of such a device is characterized in that it additionally has a compressed-air nozzle, which to a certain extent is arranged on the rear side of the device and which is directed onto the freshly applied color strip. The compressed air nozzle and the compressed air jet emerging therefrom displaces the freshly applied paint and can be used to separate a single applied strip into two separate strips. Such a nozzle may be periodically pivoted as a function of time in a direction perpendicular to the direction of travel (for example via an eccentric motor) so that the area of substrate exposed by the compressed air takes the form of a wavy line. Thus, it is possible to produce strips which are just delimited at the edge and which have in the middle a wavy strip in which the substrate is exposed. Of course, it is also possible to move the entire device periodically as a function of time in a direction perpendicular to the direction of rotation and thus to let the strips as a whole run wavy. This, in combination with such a compressed air nozzle, can give rise to exceptional safety features, such as, for example, wavy lines, which have wave-shaped strips in the middle, in which the substrate is exposed. These wavy strips, in which the substrate is exposed, may be formed in phase, in opposite phase at the same frequency as that of the overall strip, or else at a different frequency than that of the overall strips, so that astonishing optical effects are possible. Further, it is possible to set the amplitude of the air nozzle wider than the strip width, whereby the strip is completely interrupted zone by zone. The device allows the very targeted generation of stripes of different colors next to each other with a highly defined distance. This distance can deliberately be set very low, in other words, between two strips a strip in which the substrate is exposed can be produced, which has a very narrow width. Such so-called "speed cameras" can be generated as a very efficient security feature since they can not be reliably generated in a conventional sequential printing process. The distances in such a case are, for example, in the range of 0.1-0.5 mm, which is below the usual register accuracy of conventional printing methods. With such fine distances, an exceptionally strong color contrast can be achieved between the individual strips, since the individual strips are completely separated from one another, but because of their fineness the distances are visually barely discernible.

In addition, it is possible to equip such a device with a periodically controlled valve for the supply of the ink. The selective opening and closing of this valve can be used to create dotted lines to create dashed lines, which in turn in combination with a lateral displacement of the entire device, possibly even in combination with a compressed air nozzle, interesting additional visual effects, especially at the use of color effect pigments eg with iridescent pigments, possible. In addition, the device allows the production of exceptionally narrow strips with high precision. Thus, for example, strips of a width in the range of 0.5 mm to 0.4 cm can be produced, which is not possible in the methods according to the above-mentioned European specification. In conventional doctoring process so small line widths can not be achieved because z.T. the stroke width is of the order of magnitude of the squeegee windings customary for such colors.

Furthermore, the present invention relates to a method for producing at least two side by side, preferably spaced-apart strips, preferably of different color, or dotted lines on a substrate using a device as described above. The method is preferably characterized in that the substrate is preferably passed in the form of a web along a direction of travel on and in contact with the device, thereby either continuously (stripe) or intermittently (dotted or dashed lines) paint through the device directly applied over the passage openings on the substrate (without additional use of a roller) and then dried.

According to a first preferred embodiment, such a method is characterized in that on the device side facing away from the substrate, a soft counter-pressure element is arranged, the purpose of which has already been explained above.

Furthermore, such a method may be characterized preferably characterized, as already explained above, that in the running direction on the rear side of the device, a compressed air nozzle is arranged, which in periodically perpendicular to the direction deflected manner on the fresh strip a compressed air jet, such that a wavy spacing between the strips results, at which the substrate is exposed.

Furthermore, the present invention relates to a substrate, particularly preferably security paper, produced with at least two stripes or dotted lines with the aid of a method as explained above.

Such a substrate may for example be characterized in that the strips have a width of at least 0.05 cm and at most 0.5 cm, preferably of at most 0.25 cm, and have a non-zero distance, typically of at most 0.5 mm, preferably is the Distance in the range of 0.1-0.5 mm. Especially with spaced strips, a tactile, tactile effect can result. This is the stronger, the higher the application weight of the individual strips, and it can be additionally reinforced, in which the color, for example, self-expanding pigments are buried.

A further preferred embodiment of such a substrate is characterized in that the strips or line-shaped points are formed wave-shaped with periodic deflections perpendicular to the running direction. The strips are preferably of a color having color effect pigments, e.g. with iridescent pigments formed, whereby mixtures of different such pigments can be used.

The strips may also be formed from colors which contain normal, absorbing pigments and / or dyes in addition to or instead of the effect pigments. In a preferred embodiment, a single strip is carried out with: an effect pigment, another, preferably adjacent, individual strips with a normal pigment or dye without color-changing effect, the two strips having an identical hue in a view from a first viewing angle and thus the only, more homogeneous However, when viewed from a second viewing angle, the hue of the color-changing pigment changes and the strip becomes recognizable as a combination of two different individual stripes. Also, preferably, adjacent, individual strips can be realized with metameric colors which appear identical under one light source but differ under another light source.

Further, the colors may contain substances which impart additional properties, such as electrical conductivity, magnetic properties, infrared absorption, fluorescence, phosphorescence, photochromism, etc., to the respective strip.

Furthermore, the present invention relates to the use of such a substrate as a security document, in particular banknote, access card, ticket, security.

Other applications are not excluded.

Further embodiments are given in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments of the invention are described below with reference to the drawings, which are merely illustrative and not to be construed restrictive. In the drawings show: <Tb> FIG. Figure 1 is a perspective view of a coater for the production of three strips; <Tb> FIG. Fig. 2 shows a) a view from below of a coating head without depressions and in b) a section along the line A-A in a) such a device; <Tb> FIG. Fig. 3 is a view from below of a brush head with recesses with a flat bottom and a straight rear edge and in b) a section along the line A-A in (a) such a device; <Tb> FIG. Fig. 4 shows a) a view from below of a coating head with recesses with a flat bottom and a curved rear discharge edge, and in b) a section along the line A-A in a) such a device; <Tb> FIG. 5 <sep> a bottom view of a brush with indentations and side blind cuts; <Tb> FIG. Fig. 6 a shows a view from below of a brush head with recesses with a flat bottom and a straight rear edge, wherein the different angles of incidence, as shown in b) in lateral views, are indicated with contact lines to the substrate; <Tb> FIG. Fig. 7 is a bottom view of a coating head having recesses with a flat bottom and a curved trailing edge, wherein the different angles of incidence, as shown in side elevations in b), are indicated with contact lines to the substrate; <Tb> FIG. 8 is a bottom view of a coating head according to a further embodiment with recesses with a flat bottom, storage recess and rear discharge edge and lateral blind milling; <Tb> FIG. 9 <sep> a bottom view of a brush with recesses with a flat bottom and a rear edge with dimensions; and <Tb> FIG. Fig. 10 shows in a) a bottom view of a brush head with flat bottomed forward depressions for creating smooth transitions between the color stripes, with a side view given in b).

DESCRIPTION OF PREFERRED EMBODIMENTS

In Fig. 1, a coating head 1 is shown in a perspective view, under which a substrate web 3 is moved along a substrate running direction 12. On the front side 18 of the coating head 1 are still no stripes of an iridescent color (or generally a color with color effect pigments) on the substrate web, the strips are generated in the contact area between the coating head 1 and substrate web 3 (detailed discussion below) and are on the rear side 19 can be seen applied to the substrate. The strips 4 are in this case of the same width, there are three such strips 4 and between the strips 4 there is a respective distance 5.

The coating head 1 is formed in the form of a solid cylinder, for example, of a metal, and for each strip 4 there is a separate supply line 2. The coating head 1 is thus formed as a solid circular cylinder and has a circumferentially convex circumferential surface 20th

On the back side facing away from the coating head 1, the substrate 3, a counter-pressure element 29 is arranged (see also Fig. 2b). This counterpressure element 29 together with the coating head 1 clamps the substrate web 3 to some extent and is preferably made of a soft material, i. For example, it is preferred by a flexible plastic surface or by a felt pad with a bulk density (a measure of the hardness of felts, DIN 53855) in the range of 0.15-0.6 kg / dm <3>, in particular preferably in the range of 0.2-0.4 kg / dm3 trained. Thus, an optimal contact pressure of the substrate web 3 is ensured on the application area of the coating head 1 in order to ensure the most homogeneous stripe formation (same thickness across the width of the strip and independence of the same irregularities in the paper).

The counter-pressure element 29 may alternatively consist of rubber, foam rubber, or foam and may be constructed in one or more layers. Thus, for example, a counter-pressure element made of soft foam may additionally have a felt support, wherein the felt support comes into contact with the substrate web. This preferred embodiment is characterized in that the counter-pressure element adapts very well self-regulating the paper web by the soft foam, but at the same time a felt with the right hardness and good sliding properties is in contact with the paper web.

A similar self-regulating storage can also be realized by a flat brush or a construction with compression springs. The counter-pressure element can be upright, but it can also be a follower roller. In order to prevent scratch marks in the substrate web from arising at the edges of the device, this may be angled or rounded at the edges. A coating head 1 in a first construction, of a particularly simple construction, is shown in Fig. 2, in which Fig. 2a shows a view from below, i. to a certain extent from the perspective of the substrate web 3 is shown and in b a section along the line A-A, as shown in Fig. 2a. In this case, the coating head has means 6 for generating three strips 4, but it could also be more such openings 6 are provided for the formation of stripes or less, for example, only such an outlet channel 6 for color.

The coating head 1 is here as a solid circular cylinder made of a metal such as brass or stainless steel and has a series of three through the center extending through holes, each of the substrate 3 end facing the openings 6, through which the color the substrate 3 emerges. On the side facing away from the substrate 3, this hole has a slight extension so that a gradation 25 is formed. In this step, a supply line, preferably a metal tube 26 is inserted, this, as shown in Fig. 2b, for example, such that the inner diameter of this tube 26 corresponds to the inner diameter of the lower portion of the through hole. The bore 21 thus has a radius greater than the wall thickness of the tube 26 than the bore in the lower region. As can be seen in particular with reference to Fig. 2b, results due to the cylindrical formation of the bore and the curved surface 20 of the cylinder an opening which, although in the projection of Fig. 2a is circular, but which is curved in space. Correspondingly, this opening 6 has a circulation line 22 arranged on the surface 20, which to a certain extent has a front zenith 23 toward the front side 18, and a rear zenith 24 on the side facing the rear side Fig. 2b is shown, arranged in a position so that the axis of the bore 6 is aligned perpendicular to the plane of the substrate web 3, then the front zenith 23 is slightly above the substrate web and the rear zenith 24 is at the same height slightly above the Substrate web, and the contact between the coating head and the substrate web 3 takes place to a certain extent with respect to the two zeniths 23 and 24 offset by 90 degrees on a line which is indicated by dashed lines in Fig. 2a at the right-lying hole 6. In particular, by the horizontal distance between this rear zenith 24 and the substrate web 3, ink exiting down through the channel and through the bore 6 exits the substrate web and forms a strip substantially the width of the bore 6. As discussed below To be described in more detail, the application thickness can be adjusted very controlled by the inclination angle of the coating head.

In Fig. 2a, the two diameters are shown either perpendicular to the direction Dsoder parallel to the direction Dp. In this embodiment, it is a circular opening, i. Dp is the same size as Ds. But it is also possible to design the opening oval, for example, so that Ds greater than Dp. Due to the design of the opening cross-section, among other things, the color thickness along a direction perpendicular to the substrate running direction 12 can be adjusted and optimized. In Fig. 3, another embodiment of a coating head is shown. In this case, there are next to the through holes 6 on the substrate web 3 facing side of the coating head 1 in the convex portion 28 thereof an additional recess resp. Recess 7. This depression is formed in the form of a channel extending to the rear side 19 with the same extent perpendicular to the running direction 12, and this channel, with a flat bottom surface, runs rearwards to the rear side 19 so that a transversely to the substrate running direction 12th arranged rear trailing edge 27 forms.

By such a configuration, as will be described below with further figures, the exit characteristic of the color can be further improved and in particular it is possible to adjust the color thickness over the inclination angle of the coating head over a larger inclination angle range than in the embodiment Fig. 2 reliably adjust.

4, a third embodiment of such a coating head is shown. In the embodiment according to FIG. 3, a milling cutter is normally used to produce the depression 27, which bore has the same diameter as the bore 6, this milling cutter is for example inserted coaxially with the bore 6 and then to some extent towards the rear side 19 of the device 1 moved out of the cylinder of the device, wherein the recess 7 is formed as a backward open channel. In the embodiment according to FIG. 4, a milling cutter with a larger dimensioning is now used to produce the recess 7, i. with a larger diameter than the diameter of the bore 6. This larger cutter is also fed to the bore 6, but not coaxial with this but so that the outer contour of the cutter comes to lie at the foremost point on the front zenith 23 and according to the desired Depth into the cylinder. Subsequently, the cutter is moved towards the rear side 19, but not completely pushed out as in the embodiment according to FIG. 3 but already moved out of the cylinder again in a direction parallel to the axis of the milling cutter. This then results in a situation in which, as it were, an edge still remains towards the rear side 19 and does not simply result in a linear, open trailing edge 27 as in FIG. 3. In the embodiment according to FIG. 4, the milling cutter has just been guided so far back that at the rearmost point, which is indicated in FIG. 4 by the reference numeral 30, the bottom of the recess 7 is just merging into the surface 20. However, it is also possible to move the cutter a little less far to the rear, then to some extent results in the rear towards a slightly closed recess which is somewhat cup-shaped. When changing the angle of attack in this embodiment (see also Fig. 7), the points of contact with the paper migrate from along the edges of the contour towards the zenith 30 and thus to a certain extent close the application from the side with decreasing angle of attack. The embodiment is correspondingly more "tolerant" with respect to the setting of the angle of attack, for example, an embodiment according to FIGS. 5 or 6, where only the channel is closed in height successively when hiring when the angle of attack is reduced. A further possible embodiment is shown in FIG. 5, it is essentially analogous to that according to FIG. 4, but the milling cutter is led out completely backwards out of the cylinder so that a linear trailing edge results as in FIG described preferentially soft counter-pressure surface 29, it is possible that the substrate web bulges as a whole in the range of the series of openings 6 to a certain extent to the coating head 1 towards the top. This can then lead to the outer strips, where the curvature is not yet pronounced, have a greater inking thickness than at the central openings, since there the curvature is strongest and to some extent the substrate web is pressed the furthest into the coating head.

To avoid this effect largely, it is possible unilaterally or preferably on both sides of the actual outlet openings on the coating head 1 side blind milling 16 form. These blind cuts are preferably configured with the same depth and in shape as the depressions 7 and lead to a deformation of the substrate web in the coating head, if any, is not different for the individual juxtaposed outlet openings. 6

6, for a further embodiment of a coating head, in which a milling cutter as used in the embodiment according to FIG. 4 is now completely led out to the back of the coating head and accordingly results in a trailing edge 27, as they has been described in connection with FIG. 3 (analogous to FIG. 5), it is shown how a differently set angle of inclination of the central axis 31 of the bore 6 to the plane of the substrate web 3 gives rise to a different thickness of the ink application.

In the sectional view according to FIG. 6b on the left side (situation A) is shown what happens when the axis 31 is oriented perpendicularly (angle of attack equal to 90 °) to the plane of the substrate web 3. In this case, the supplied through the supply line 2 paint down through the opening 6 and fills to the rear, so to speak, the recess 7 from. The height of the rear exit edge 27 above the plane of the substrate web 3 then essentially defines the thickness of the resulting strip 4. In the vertical position according to FIG. 6b on the left side, this results in a high or mostly maximum layer thickness of the strip 4, by analogy to the maximum opening at the rear exit edge 27. The contact line between the coating head and the substrate web is shown in Fig. 6a by the dashed and marked A line, this line passes through the central centers of the three adjacent holes 6th

Now, if the angle of attack from the vertical position 13 as shown at the far left pivoted into a position with a lower angle 14, that is to values less than 90 ° (the pivoting takes place about the central axis of the cylinder of the coating head 1, this axis is perpendicular to the substrate running direction 12), the rear exit edge 27 descends onto the substrate web 3. The distance between the substrate web 3 and the rear exit edge 27, however, largely determines the resulting layer thickness of the strip 4, correspondingly results in the slightly inclined situation B. lower layer thickness than in the vertical position A.

This is shown for a slightly more extreme situation rightmost, here the inclination angle 15 is reduced so far that only a small distance between the surface of the substrate web and the rear trailing edge 27 results. In this case, the layer thickness of the strip 4 will be very thin.

Thus, it can be seen how in a very simple but yet reproducible and reliable manner, the application thickness of the strip on the inclination angle of the coating head about an axis perpendicular to the direction 12 can be adjusted. For this purpose, the coating head has a suspension rotatable about this axis, i. The coating head is integrated into a unit, which allows to adjust the angle 13-15 according to the needs and thus determine the layer thickness over this angle. It is advantageous that the coating head is convex at least in that region in which the contact line for the different positions A-C comes to rest (compare lines in FIG. The area 28, which is convex, may in this case correspond to a circular-cylindrical surface, but it is also possible to configure the curvature of this surface differently, for example if one wishes to have a linear dependence between the angle setting and the strip thickness in a certain area.

In Fig. 7 is the sake of completeness, the dependence resp. The ratio of inclination angle 13-15 to the thickness of the layer 4 shown here again for a coating head according to the embodiment of FIG. 4. Again, it can be seen how the rear trailing edge 30 has a different height above the substrate web 3, depending on the angular position and accordingly Also, a different thickness of the strip 4 results. In addition to reducing the height of the exit edge 30 above the substrate web 3, in this example a change in the angle of attack is accompanied by a tapering of the exit width.

Another embodiment of such a coating head is shown in a view obliquely from below in Fig. 8. The holes are also cylindrical. Here are five holes arranged side by side and right and left of this series of holes 6, there are the already mentioned above side blind milling. In this case, the remaining between the recesses 7 to the individual holes webs 8, where the surface of the coating head is at the high level, not formed as in the embodiments described above to the trailing edge, but tapered in front of the trailing edge 32 and even disappear completely, so that forms a single common exit edge 32 for all holes. For the two laterally arranged Blindfräsungen 16 but the web is continuously formed to the exit edge 32, so that a lateral boundary of the five formed by such a stripper strip is clear. In addition, the coating head according to this embodiment does not have the depressions already discussed above but in the context of this depression over each deeper into the coating head extending supply recesses 17 which have a greater lateral extent than the holes but a lower than the wells 7th

These supply wells fill, similar to a fountain pen, with color, resulting in a lower speed dependence of the coating weight, as will be explained in more detail below in a descriptive example. The order quantity can be increased by increasing the milling depth.

On the basis of specific examples, such devices will now be further documented. The essential properties of the devices per se are summarized in Table 1, the characteristics of the strips produced by such devices are summarized in Tab. 2, and in Tab. 3 is a suitable composition for a color as used for the experiments , stated. The dimensions given below correspond to the definitions according to FIG. 9.

Example 1: Brush with round holes

A brass round rod of 10 mm diameter and 65 mm in length was provided with 5 through holes with a diameter of 1.6 mm. The holes ran from the top through the center to the bottom of the rod and were spaced 2.0mm apart. The holes were drilled from the top to the center of the round rod, ie to a length of 5 mm, to a diameter of 2.0 mm. These holes were equipped with 60 mm long brass tubing with 2.0 mm outer diameter and 1.6 mm inner diameter and soldered. The brass tubes were alternately slightly angled at their free ends, in order to better fit tubes with 2.0 mm inner diameter and 3.0 mm outer diameter for ink supply. The coating die thus obtained corresponds to Model 6 of Table 1 (5 individual wells were realized for the preparation of 5 individual strokes).

The coating head was inserted into a suitable holder and placed with the openings down on a paper web.

The holder for such devices is in each of these examples constructed such that the device can be rotated therein about its central axis, can be moved across the substrate web transversely to the direction of travel, and lowered vertically onto the paper web. By the vertical lowering, it is possible to press the device onto the substrate web, which is underlaid from its underside with a counter-pressure element made of felt. The contact pressure with which the device was pressed onto substrate web and counter-pressure element is typically 50-70 N. The brass tubes were provided with tubes through which coating colors according to the recipe acc. Table 3 was required. The paper web moved at 40 m / min under the coating head. The angle of attack of the coating head was set at 90 °, i. the holes of the coating head ran at right angles to the surface formed by the paper web. This resulted in a line image of 5 juxtaposed individual bars of 1.6 mm width with a distance of 0.4 mm with over the individual bar width varying color order. The application of paint was highest in the middle of the single strokes, lower at the edges of the single strokes and tapering towards zero. By changing the angle of attack, the order quantity could be reduced, but the different application of color across the width of each individual line was preserved.

Example 2: Brush with recesses

A coating head analogous to the model mentioned in Example 1 was prepared. In addition, however, depressions in the form of channels were milled by the ink-carrying holes in the running direction of the paper web. These had a depth of 0.2 mm (penetration depth, measured from the tangential plane to the cylinder surface at the exit point of the bore), a width of 1.8 mm and a length of 1.4 mm. Under these conditions, starting from each bore, a recess with a straight outlet edge over its entire width results. The individual wells are separated in the masses by webs of 0.2 mm width over the entire length to the outlet edge towards each other. The coating die thus obtained corresponds to the model 5 from Table 1. With the coating head, a paint application was produced on a moving paper web, analogously to the description under Example 1. It turned out that with an angle of attack of 90 °, a great deal of color got onto the paper web and the individual color traces had a slightly smaller width than the width of the channels. Only with slight adjustment of the coating head, i. with slight closing of the gap formed between the outlet edge of the milling channels and the running paper web, resulted in single strokes, which corresponded fairly closely to the width of the wells and had a uniform application of paint. In contrast to the individual lines according to. Example 1 was uniform in this example over the entire width of each individual line. Between the single strokes resulted a narrow distance of approx. 0.15 mm, which remained free of paint application. This fine distance - known as a so-called "speed camera" - is just barely visible to the naked eye and visually gives the impression of a very clear separation of colors between the individual lines. By varying the angle of attack, it was possible to adjust the application of paint without the distances between the individual lines changing or even disappearing.

Example 3: Brush with recesses with short webs

A coating head analogous to the model mentioned in Example 2 was prepared. The ink-carrying wells, which are separated in Example 2 on their entire length of webs with a width of 0.2 mm, but were changed in this example so that the webs the wells only to a length of 1.0 mm (measured from the center of the color-leading Bore) separated from each other. On the remaining 0.4 mm to the outlet edge, the depressions were thus no longer separated from one another by webs. The coating die thus obtained corresponds to the model 4 from Table 1. With the coating head, a paint application was produced on a moving paper web, analogously to the description under Example 1. At an angle of attack of 90 °, separate single strokes with high paint application and clearly visible distance formed. When lightly setting the coating head, i. with slight closing of the gap, which is formed between the outlet edge of the milling channels and the running paper web, the individual lines combined to a uniform, multi-colored paint application. In contrast to the single strokes according to Example 2, the individual strokes were no longer separated by a narrow distance from each other, but formed a uniform application of paint over the entire width of the 5 individual strokes. Surprisingly, the paint jobs of the single strokes only flowed together, but did not mix at their contact lines, so that a very good color separation with very good contrast resulted at the contact line. By varying the angle of attack Hess was able to adjust without the color separation between the individual lines changed.

Example 4: Brush with color mixing

A coating head analogous to the model mentioned in Example 2 was prepared. However, bores and millings were offset from the axis of rotation of the coating head away from the direction of travel of the paper web by 1.4 mm to the rear. Fig. 10 shows in a) a view from below of such a coating head and in b) lateral views for a vertical angle of attack. When the device is now tilted slightly counterclockwise, the gap opens at 30 and the paint is applied. The further tilted, the stronger the paint application. The recesses thus ended exactly above the axis of rotation of the coating head with a depth of 0.2 mm. With the coating head, a paint application was produced on a moving paper web, analogously to the description under Example 1. In each case, a small pile of color was formed in front of the coating head, so that in the adjoining areas of adjacent colors, they could flow into one another and mix with one another. With lightly setting the coating head against the running direction of the paper web, i. with easy opening of the gap, which is formed between the outlet edge of the milling channels and the running paper web, resulted in a uniform, multicolored paint application. In contrast to the single strokes according to Example 3, the individual strokes were no longer clearly separated, but evenly mixed at their contact lines, resulting in a uniform color transition between the individual strokes. It was given a paint job, which gave the impression of a rainbow over its entire width. By varying the angle of attack Hess was able to adjust without the color mixture between the individual lines changed significantly.

Example 5: Multicolored paint application with exposed line

A coating head for producing a paint consisting of 5 individual lines, each with a width of 3 mm, was produced. For this purpose, a brass round bar of 16 mm diameter was selected and made from a coating head with the dimensions of model 1 in Table 1.

On a moving with 40 m / min paper web was thus a multicolored, uniform, superficial paint job consisting of 5 different colored single bars that touched each other generated. With a compressed air nozzle was blown at a distance of about 20 cm in the direction of the coating head on the wet paint. The inner diameter of the nozzle was 2 mm, the distance of the nozzle from the paper web 10 mm, the air pressure 6 bar. The nozzle was positioned over the middle of the 5 individual strokes. Surprisingly, the multicolor paint application was almost completely displaced by the compressed air over a width of about 3 mm, so that the paper surface was almost completely uncovered. The paint application of the middle single line on which the compressed air was directed was found on both sides of the exposed area, in the form of a thin colored strip of about 1 mm width. The adjacent color stripes were also reduced in width, from the original 3 mm to about 2 mm. Only the outer two individual strips seemed unaffected in their width.

Example 6: Multicolor paint application with exposed serpentine line Example 5 was repeated, this time an eccentric motor mounted directly on the air nozzle was switched on. It was a DC electric motor with a nominal voltage of 12 V, on the axis of which a steel disc of 4 mm thickness and 10 mm diameter was impressed eccentrically. At an applied voltage of 12 V resulted in a speed of 4000 rev / min. Accordingly, the air nozzle oscillated by the eccentric motor with a frequency of 67 Hz. With this oscillating air nozzle was blown analogously to Example 5 on the wet paint application. The wet color was displaced by the oscillating jet of air, giving a serpentine line that was virtually colorless. The width of the line was about 3 mm, the width in which the line oscillated about 8 mm, and the length of a complete oscillation about 1 cm. <Tb> Model <sep> diameter String head <sep> Width Depression <sep> distance Single line <sep> milling depth of the Depression <sep> Width Steg <sep> Length Steg <sep> Length Edge bar <sep> Drill diameter <Tb> <sep> A <sep> b <sep> a <sep> z <sep> d <sep> L <sep> L <sep> D <Tb> 1 <sep> 16 <sep> 2.8 <sep> 3 <sep> 0.3 <sep> 0.2 <sep> 1.5 <sep> 2.17 <sep> 1.6 <Tb> 2 <sep> 16 <sep> 2.8 <sep> 3 <sep> 0.4 <sep> 0.2 <sep> 1.5 <sep> 2.5 <sep> 1.6 <Tb> 3 <sep> 16 <sep> 2.8 <sep> 3 <sep> 0.3 <sep> 0.2 <sep> 2.5 <sep> 2.17 <sep> 1.6 <Tb> <sep> <sep> <sep> <sep> <sep> <sep> <sep> <sep> <Tb> 4 <sep> 10 <sep> 1.8 <sep> 2 <sep> 0.2 <sep> 0.2 <sep> 1.0 <sep> 1.4 <sep> 1.6 <Tb> 5 <sep> 10 <sep> 1.8 <sep> 2 <sep> 0.2 <sep> 0.2 <sep> 1.4 <sep> 1.4 <sep> 1.6 <Tb> <sep> <sep> <sep> <sep> <sep> <sep> <sep> <sep> <Tb> 6 <sep> 10 <sep> - <sep> 2 <sep> - <sep> - <sep> - <sep> - <sep> 1.6

Table 1: Mass (in mm) of different brush models. Measurements see FIG. 9. <tb> Model <sep> ResultDirect adjoining single bars with a width of 3.0 mm with moderate application of paint (about 8 g / m <2> <tb> 1 <sep>) Directly adjacent single strokes with a width of 3.0 mm with high paint application (about 14 g / m <2> <tb> 2 <sep>) Single bars of approx. 2.85 mm width with a fine distance (speed camera) of approx. 0.15 mm, with moderate application of paint (approx. 8 g / m <2> <tb> 3 <sep>) Directly adjacent single strokes with width of 2.0 mm with moderate application of color (about 8 g / m <2> <tb> 4 <sep>) Single bars of approx. 1.85 mm width with a fine distance (speed camera) of approx. 0.15 mm, with moderate application of paint (approx. 8 g / m <2> <Tb> 5 <sep>) <tb> 6 <sep> Single slices of 1.6 mm width with a distance of 0.4 mm with color application varying over the single-slit width (little color application at the edges of the individual slices, high color order in the middle of the single slices)

Table 2: Result of the multicolor, superficial paint application for the spread head models defined under Table 1 at a speed of 40 m / min.

Tab. 3 shows a typical composition of a color effect pigment ink for use in connection with the proposed device. <tb> Component <sep> Mass fraction <sep> Mass fraction preferred <tb> Pigment <sep> 5-20% <sep> 12% <tb> binder (dry) <sep> 15-30% <sep> 20% <Tb> solvent / water <sep> 40-80% <sep> 60% <Tb> auxiliaries <sep> 0-15% <sep> 8% <tb> Viscosity <sep> 40-55 mPas <sep> 45 mPas

Table 3: Typical composition of coating colors for use in devices according to the invention.

A specific composition of such a color is summarized in Tab. 4: <tb> Component <sep> Mass fraction (%) <Tb> acrylate / Binder <sep> 9:50 <Tb> acrylate / Binder, self-crosslinking <sep> 39.00 <tb> Water as solvent <sep> 31.00 <Tb> defoamers <sep> 1:00 <tb> Aid pH Control <sep> 1.00 <Tb> Tools / solvents, et al 2-propanol <sep> 2:00 <Tb> Color Effect Pigment <sep> 12:00 <Tb> thickener <sep> 1:50 <Tb> Total <sep> 100.00

Table 3: Composition of the color used with color effect pigments such as e.g. iridescent pigments. <Tb> formulation <sep> viscosity <sep> <sep> <tb> <sep> Ford 4 mm (s) <sep> Ford 5 mm (s) <sep> Rheomat RM180 (MPas) <Tb> Gem. Tab. 3 <sep> 19 <sep> 11 <sep> 45

Table 4: Viscosities (measured at about 27 ° C)

Preferably, oxidatively drying inks, particularly preferably aqueous, oxidatively drying inks are used, but it is also possible to use solvent-free, UV-drying inks.

These non-limiting examples represent only a selection of tools according to the invention for applying multi-color, superficial paint applications. Numerous variations deviating from these examples are conceivable. Basically, it turns out that with increasing individual stroke width b, ideally larger coating head diameters A are also selected. A larger coating head diameter A also allows a more accurate adjustment of the paint application (order quantity / application weight) by varying the angle of attack. A further improvement consists in that, in addition to the ink-carrying depressions, a blind milling of the same or a similar milling depth is carried out, as shown by way of example in FIG. 5/9 with the designation symbol 16. Such Blindfräsungen 16 prevent the paper web when pressing the coating head in close proximity to the ink-carrying wells undergoes a higher pressure, which can otherwise cause the paper web under the coating head elastically or permanently deformed, is pressed into the wells, resulting in may cause paint to run irregularly over the multi-color superficial paint application. It is also possible to provide corresponding blind milling behind the ink-guiding millings. In a further preferred embodiment, additional recesses 17 are provided in the coating channels, in which an ink supply can accumulate. A coating head provided with such storage chambers has the advantage that the application of ink remains almost constant over a wide speed range, without the ink application having to be adjusted by adjusting the setting angle. For example, in accordance with a brush with the masses. Model 1 from Table 1 for painting a multicolored, superficial, consisting of 5 individual lines of 3 mm width each color wells of 1 mm depth (in addition to the cutting depth z of the coating channel) and 1.5 mm in length proven. This model delivered a uniform application of paint at a constant speed of attack in a speed range of 20 m / min to 60 m / min, while in a similar model without corresponding recesses, the inking in the range of 20-40 m / min was constant and in the range of 40 -60 m / min continuously decreased resp. had to be kept constant by adjusting the angle of attack and associated opening of the gap between the paper web and the top of the playing channel. By appropriate dimensioning, it is possible to obtain coating tools according to the invention which have their optimum operating point at industrially customary speeds of for example 60-140 m / min. Also much higher speeds, e.g. up to 500 m / min, are possible by appropriate dimensioning. With so dimensioned coating tools, it is possible, for example, to perform a superficial, multicolor paint application directly in a paper machine and not to perform only after completion of the paper on an additional finishing machine with much lower production speed. Because of the small dimensions and the high variability with respect to the speed of the coating tools according to the invention, retrofitting in existing paper machines or other existing systems is usually easily possible, in contrast to the retrofitting of other coating tools corresponding to the state of the art.

Instead of the air nozzle described in Example 5 and Example 6, the still wet, multicolored, superficial paint application can be treated with an airbrush spray nozzle. In addition to the displacement of the paint application can thus be sprayed on another color. The additional, sprayed-on ink replaces the repressed paint application and may, depending on the distance of the airbrush nozzle from the paper surface, more or less mix at the edges with the paint application. Invisible, for example, ultraviolet light fluorescent formulations can also be sprayed on. It is also possible to print with an inkjet printhead in the still wet coating color and so accommodate variable information in the inking. The coating colors of the individual lines may have, in addition to their coloring properties, further, possibly also machine-readable, properties. For example, they may have fluorescent properties by adding fluorescent and / or phosphorescent substances to the coating colors. For example, an application of color consisting of three single strokes in the colors red, yellow and blue can show the combination of colors green, blue and orange under ultraviolet light, resulting in a surprising, counter-intuitive effect. Furthermore, the colors may have magnetic properties, either due to the nature of the pigments used, or due to admixtures, for example in the form of black iron oxide or metallic nickel powder. In addition, pigments with magnetic properties can be magnetically aligned. Especially with effect pigments can be achieved very interesting effects. Examples of suitable pigments are Sun Chemical's SunGem color-changing pigments from Sun Chemical, but also metal pigments such as nickel pigments. If the substrate web is guided immediately after coating over a follower roller equipped with magnetic elements, for example permanent magnets, the pigments align with the magnet, resulting in a different color impression and / or different angular dependence of the color at these points of the coating as in places that were not in contact with a magnetic element.

The coating colors can further substances for identification may be added, such as feature substances, detection reagents, etc. Further, the coating colors substances can be added to increase the tactility, for example, self-expanding pigments such as Expancel from Akzo Nobel.

Further additional properties are, for example, IR-IR fluorescence, IR-VIS up-conversion, thermochromism, photochromism, chemical reactivity to detection reagent, IR absorption.

In a preferred embodiment, the coating tools are made of brass. In a further preferred embodiment, the coating tools made of stainless steel, for example, the quality V2A, V4A, stainless steel 18/8, 18/10 stainless steel. The coating tools can also be hardened, nitrided, coated and / or surface-treated, they can be, for example, superficially chrome-plated or hard chrome-plated or provided with a ceramic coating such as chromium nitride, titanium carbide or diamond-like carbon. Coating tools made of harder base materials or those with appropriate surface finish are characterized by a higher abrasion resistance and thus by a longer service life.

The multicolored, superficial paint jobs obtained with the tools according to the invention are distinguished by a particularly high degree of security against counterfeiting, which can be found inter alia. from the precision with which the individual strokes of the paint job are applied. This precision results automatically from the fact that all individual strokes are applied simultaneously, in the same operation, and with the same tool.

To reproduce an existing example of 5 single strokes paint job 5 individual passes would be necessary on a screen printing machine. On the one hand, such a project would be extremely costly for a counterfeiter and, on the other hand, provides an unsatisfactory printing result which deviates significantly from the original obtained by the coating tool according to the invention. Since every single print run is inherently subject to tolerance deviations in the range of a few tenths of a millimeter, no color order can be obtained in which the individual lines are exactly adjacent to each other. It is even more difficult to readjust a paint application according to Example 2, which has the finest distances in the range of a few tenths of a millimeter between the individual lines. These distances are similar to the tolerances of the individual print passes and can not be readjusted true to the original. Likewise, it is not possible to reproduce a non-uniform application of paint as described in Example 1, since the application of ink in screen printing is invariable and a different color density can be readjusted at most by screening in an insufficient manner. Likewise, a rainbow-like color gradient of the individual strokes as described in Example 4 is not or only unsatisfactory nachstellt.

LIST OF REFERENCE NUMBERS

[0083] <Tb> 1 <sep> coating head <Tb> 2 <sep> leads <Tb> 3 <sep> substrate web <tb> 4 <sep> coating, strips <tb> 5 <sep> Space, distance <tb> <sep> between 4 <tb> 6 <sep> Opening, drilling <tb> 7 <sep> recess, recess <Tb> 8 <sep> Steg <tb> 9 <sep> contact line A <tb> 10 <sep> touch line B <tb> 11 <sep> touch line C <Tb> 12 <sep> substrate running direction <tb> 13 <sep> Angle of attack A <tb> 14 <sep> angle of attack B <tb> 15 <sep> angle of attack C <tb> 16 <sep> Side blind milling <Tb> 17 <sep> supply recess <tb> 18 <sep> front page <tb> 19 <sep> back page <tb> 20 <sep> peripheral surface of the cylinder <tb> 21 <sep> Hole for supply lines <tb> 22 <sep> Circulation line of 6 <tb> 23 <sep> front zenith of 22 <tb> 24 <sep> back zenith of 22 <tb> 25 <sep> grading in through-hole <Tb> 26 <sep> Pipe <tb> 27 <sep> rear trailing edge of 7 <tb> 28 <sep> convex section of 1 <Tb> 29 <sep> counterpressure element <tb> 30 <sep> rear exit point of 7 <tb> 31 <sep> Axis of the hole 6 <Tb> 32 <sep> trailing edge <tb> D <sep> diameter of the opening <tb> Ds <sep> Diameter of opening <tb> <sep> perpendicular to the direction of travel <tb> Dp <sep> Diameter of opening <tb> <sep> parallel to the direction of travel <tb> a <sep> distance of the openings <tb> b <sep> Width of the recess <tb> d <sep> Width of the bridge <tb> l <sep> Length of the bridge <tb> L <sep> Length of the recess <tb> t <sep> depth of 7

Claims (15)

1. Device (1) for the application of a paint on a along a running direction (12) on the device (1) guided past substrate web (3), characterized in that the device (1) in the running direction (12) convex and perpendicular to the running direction (12) straight trained surface area (28), which can be brought into contact with the substrate web (3), and that in the convex surface area (28) one, preferably at least two separately controllable with color, in a direction perpendicular to the running direction (12) offset through openings (6) are provided for the color through which the ink is applied directly to the substrate web (3), wherein the application amount of the color depends on the angle of attack (13-15) between the plane of the substrate web ( 3) and the normal to a tangential plane on the surface area (28) at the location of the respective passage opening (6). 2. Apparatus according to claim 1, characterized in that in the region of each passage opening (6) in the surface region (28) has a recess (7) is arranged, which the passage opening (6) in the running direction (12) and / or against the running direction (12 ) with a depth (t). 3. A device according to claim 2, characterized in that the recess (7) extends the passage opening (6) in the running direction (12) and in the running direction (12) is formed auslaufend. 4. Device according to one of the preceding claims, characterized in that the device is formed at least in the surface region (28) as part of a circular cylinder, pass through the cylinder surface (20), the passage openings (6). 5. The device according to claim 4, characterized in that the device comprises a solid, preferably made of metal circular cylinder whose axis is parallel to the substrate web (3) and perpendicular to the running direction (12), wherein the passage openings (6) as central through holes are formed, wherein the preferred means in the circular cylinder means for temperature control are provided. 6. Device according to one of the preceding claims, characterized in that side of the passage openings Blindfräsungen (16) are arranged without color guide. 7. Device according to one of the preceding claims, characterized in that in the region of each passage opening (6) in the surface region (28) has a recess (7) is arranged, which the passage opening (6) in the running direction (12) having a depth (t) expands that the recess (7) in the running direction (12) is formed expiring, and that the recesses (7) of adjacent passage openings (6) at least in the region of a common outlet edge (32) at least over a partial section are not separated by a web. 8. A method for producing at least two juxtaposed, preferably spaced apart strips (4) or dotted lines on a substrate (3) using a device according to one of the preceding claims, characterized in that the substrate (3) preferably in the form of a web along a running direction (12) on the device (1) and in contact with this is passed over, and thereby applied either continuously or intermittently paint through the device directly through the openings (6) on the substrate and then dried. 9. The method according to claim 8, characterized in that on the device (1) facing away from the substrate (3), a counter-pressure element (29) is arranged. 10. The method according to any one of the preceding claims 8 or 9, characterized in that in the running direction (12) on the rear side (19) of the device, a compressed air nozzle is arranged, which, preferably in periodically perpendicular to the direction (12) deflected manner on directing the fresh strip a jet of compressed air, so that a distance, preferably a wave-shaped distance, between the strips (4) results. 11. Substrate, particularly preferably security paper with at least two strips (4) or dotted lines produced with the aid of a method according to claims 8-10. 12. A substrate according to claim 11, characterized in that the strips (4) have a width of at least 0.5 mm and at most 5 mm, preferably of at most 2.5 mm, and have a non-zero spacing of at most 0.5 mm, preferably in the range of 0.1-0.5 mm. 13. A substrate according to any one of claims 11 or 12, characterized in that the strips (4) or points are wave-shaped with periodic deflections perpendicular to the running direction (12). 14. A substrate according to any one of the preceding claims 11-13, characterized in that the strips of a color effect pigment color, in particular with iridescent pigments, are formed, optionally in combination with other optical or readable via auxiliary, possibly machine-readable feature elements such as preferably pigments specific absorption or specific emission, and / or with fluorescent pigments. 15. Use of a substrate according to one of claims 11-14 as a security document, in particular banknote, passport, identification card, visa etiquette, ticket, admission card, seal, tax stamp, certificate, birth certificate, vehicle pass, bill of lading, certificate of guarantee, labels, security.