KR20070011108A - A two-step method of coating an article for security printing - Google Patents

Abstract

A two-step material coating method security printing is provided to form a complex image with at least two coatings displaying two images in different shapes although the images move together in moving the images in one direction. The two-step material coating method security printing comprises the steps of: forming a first coating capable of setting directional property, on a first surface of a substrate by using a magnetic field or an electric field to apply the directional property on flakes of the coating according to a magnetic field line and forming a second magnetic coating on the upper surface of the first coating or a second surface of the substrate by using a magnetic field or an electric field to apply the directional property on flakes of the second coating according to the magnetic field line after the first coating is cured.

Description

A two-step method of coating an article for security printing

1 is a view showing a jewel showing a constellation formed by the soft portion of small rutile (titanium dioxide) showing six lights.

2A-2D illustrate the step of forming an image with two rolling bars that appear to move as the viewing angle changes.

3A-3D illustrate a process and image for forming the final image shown in FIG. 3D of a globe shape with text providing a flip-flop optical effect.

4A-4D illustrate the steps of forming a flip-flop and a rolling bar formed on the same substrate.

5A-5D show several images in the step of printing two rolling bars that appear to be close to each other as if forming one rolling bar, and the two rolling bars appear to be apart when the image is oblique. to be.

6a to 6b show a container having the features of the rolling bar shown in FIG. 5d.

7A to 7B are micrographs showing specific portions of an image formed by a two-step printing process, and the two micrographs correspond to the same portions of the image.

The present invention generally relates to a two-step method for forming a securely printed image, and more specifically, to a method of forming an image by coating with an ink containing an alignable engraving material on a surface of a substrate; Exposing a coated surface to a magnetic or electric field to align at least a portion of the flake material and then to a second coating on or below the first coating of the substrate.

The present invention relates to coating an substrate with ink, paint or other means to form an image with an optical illusion effect. Many surfaces painted or printed with flat pallet-like particles exhibit higher reflectivity and brighter color compared to surfaces coated with paints or inks containing conventional pigments. Substrates painted or printed as pigments comprising color-shifting flakes show color change when viewed from different angles. The pigments, including the flakes, may be magnetically sensitive and include materials capable of alignment or reorientation when a magnetic field is applied. Such particles can be formed by mixing magnetic and nonmagnetic materials, and are mixed with paints or colorants in the manufacture of magnetic paints or inks. The characteristics of these products are the ability of the flakes to be oriented along the lines of the field applied within the layer of liquid paint or ink, and the location of the flakes generally remains after drying or curing of the paint or colorant. It can be maintained. The relative orientation to the coated surface of the flakes and their primary dimensions determine the reflectivity and its direction, and-or may determine the saturation of the paint or ink. Alternatively, the dielectric material is adjustable in its position in the electric field.

The alignment of magnetic particles along magnetic fields has been known for centuries and is well explained in basic physics textbooks. Such explanations can be found on page 662 of the sixth edition of Basic Physics, written by Halliday, Resnick, and Walker.

The patents mentioned below are referred to as part of this specification for all purposes.

U.S. Patent No. 3,853,676 to Graves et al., Which is capable of controlling magnetic orientation with a film forming material, has a curved orientation and includes pigments located in close proximity to the film. It describes the coloring of a substrate with a film that can be seen with the naked eye so that the location of the film can be indicated.

U.S. Pat.No. 5,079,058, in Tomiyama, is prepared by layering an embossed sheet layer, a pressure sensitive adhesive layer, a base sheet layer, a patterned film layer in sequence, or additionally layering a colored print layer. A patterned film is disclosed that forms a laminate sheet having a multilayer structure. The patterned film layer may be formed by coating a liquid coating composition including powdery magnetic material on one surface of the base sheet to form a film of the fluid, and fluidizing the powdery magnetic material contained in the fluid film. And forming a pattern by applying magnetic force in a state.

US Pat. No. 5,364,689 to Kashiwagi discloses a method and apparatus for manufacturing a product having a magnetically formed pattern. The magnetically formed pattern is visible on the surface of the printed product by varying the degree to which light incident on the printed layer is reflected or absorbed by the magnetic particles arranged in a shape according to the desired pattern. More specifically, Kashiwagi describes how various patterns formed by magnetically aligning flakes of nickel can be formed on the surface of the wheel cover.

US Patent No. 6,808,806 to Flex Products Inc., by Phillips, discloses a method and apparatus for forming an image on a coated article. The method generally involves forming a liquid, substitutable pigment coating on a substrate using a magnetizable pigment coating comprising a plurality of non-spherical particles or flakes. Thereafter, while the coating is in the liquid state, a magnetic field is applied to the selected portion of the pigment coating, which changes the orientation of the selected magnetic particles or flakes. Finally, in order to form a three-dimensional, similar image on the coated surface, the pigment coating is solidified by immobilizing the oriented particles or flakes that are not parallel to the surface of the pigment coating. The pigment coating may comprise various interference or non-interfering magnetic particles or flakes, such as magnetic color-shifting pigments.

U. S. Patent No. 6,103, 361 discloses a patterned pattern useful for producing decorative kitchen utensils formed by coating a base consisting of a mixture of fluoropolymers and magnetic flakes which can be magnetically induced in a polymer coating composite. Initiate the substrate. Baked fluoropolymer embossed coatings contain magnetizable flakes. Some of the flakes are oriented in the plane of the substrate and some of the flakes are magnetically new to form a pattern in the coating that is observed by the reflected light. The flakes have a longest dimension that is greater than the thickness of the coating. (The longest length of the flakes is greater than the thickness of the coating.) A patterned substrate is formed by providing a magnetic force through the ends of a magnetizable dye located underneath the coated base to induce an imaging effect or pattern. do.

A common feature of the aforementioned prior art materials is the formation of various types of patterns in painted or printed layers. Most patterns are in signs such as symbols, shapes, signs, or letters, and these patterns are copies of the magnets under the substrate, blocking the light on the outlines appearing in the paint or ink layer and keeping them magnetic. It is formed by keeping the flakes aligned constantly. The desired pattern is seen on the surface of the painted material as light incident by incident on the paint layer is reflected or absorbed differently by small groups of magnetized and non-spherical particles.

While these prior art materials provide some useful and interesting optical results, there is a need for patterns that have a higher intensity optical illusion and are more difficult to duplicate. A method and apparatus for imparting orientation to magnetized flakes, US Patent Application No. 2005-0106367, filed on December 22, 2004 to Raksha et al., Is based on the basic embodiments of the present invention. Several interesting embodiments that provide optical optical phenomena such as "rolling-bar" or "flip-flop" are described. Nevertheless, there is a need for two layers of coatings to provide different patterns formed on one substrate that provide an image that appears to move independently when light changes or the image rotates or tilts.

It is an object of this invention to provide a more complex image having at least two unique features, each present in a separately formed coating.

The object of the present invention is to provide a more complex image having at least two unique features present in the coatings, each of which is at least two coatings that move together in one direction but which appear to be different, but in different shapes. To provide.

According to one aspect of the invention, the present invention comprises the steps of applying a first magnetic coating to a substrate to impart orientation along magnetic lines to the flakes in the coating using a magnetic field; After the first coating is cured, a method is provided for coating a material comprising using a magnetic field on top of the first coating to provide a second magnetic coating to direct the flakes along a line of magnetic force in the second coating.

According to another aspect of the invention, the step of applying a first magnetic coating on the substrate; Using a magnetic field to direct the flakes in the coating depending on the direction of the lines of magnetic force; After the first coating is cured, applying a second magnetic coating on top of the first coating to impart directionality dependent on the direction of the magnetic field lines to the flakes in the second coating using the second magnetic field; There is also provided a material coating method comprising curing the second magnetic coating.

According to another aspect of the present invention, two distinctive features in an image formed by magnetic particles arranged by a magnetic field and appearing to move simultaneously when the image moves or a light source illuminating the image, but show relative movement to each other Provide an image with

According to another aspect of the invention, formed by magnetic particles, two distinctive features in the image appear to move, such that the image moves in two directions or the light source illuminates the image moves in two directions When one feature moves, the other provides an image that does not move or appears to be moving in reverse.

The inventive method of providing an optically optically illuminating image according to the present invention comprises the steps of applying a pigment having a magnetically alignable flake therein above or below an already formed image and the magnetically alignable flakes. Magnetically aligning in the pigment and curing the flakes.

In view of the above broad aspect of the present invention, although the magnetically alignable flakes should be preferably used, and a magnetic field should be provided to align the magnetic alignable flakes, the plurality of flakes are simultaneously moved in a predetermined direction. It is to be understood that other force fields may be used to align, and that is also included in the technical spirit of the present invention.

More broadly, the present invention uses a magnetic field or an electric field to apply the first coating with an optical effect on the first side of the substrate by directing the flakes in the coating regardless of the field in which they are acting, A second coating having an optical effect on the top or on the second side of the substrate, but provides a method of forming an image in which the effect of double coating or a combined effect can be seen at least on one side of the substrate.

In an alternative embodiment of the invention, the first and second coatings having a surface with an embossed pattern formed therein or thereon comprise diffractive flakes, the flakes in the first coating following a surface relief pattern, the second It is in a different direction than the diffractive flakes in the coating.

Arrangement of magnetic flakes dispersed in a paint or ink colorant along the lines of magnetic force applied to the flakes produces various optical illusion effects. Many of these effects, as described in other patents or patent applications assigned to Flex Products Inc., have a dynamic animation appearance similar to holographic kinograms or the jewel relief effect. When a graphic image printed on the surface of a substrate in the presence of a magnetic field is tilted or warped with respect to a light source or observer, the optical illusion effect approaches or moves away from the observer, to the left or to the left.

However, in the context of the present invention, in the presence of various magnetic fields, it is possible to form a wide variety of very complex kinds of optical effects using two stages of printing or the printing of a medium using magnetic ink or paint containing magnetic particles. Do. In the first step, transparent or stained with magnetic pigments in reflecting or color-shifting diffraction or any other palletized form with one concentration (preferably 15-50% by weight) Ink or colorant is printed-painted in a predetermined graphical pattern on the surface of the material, exposed to a magnetic field for a defined optical effect, and cured to fix the magnetic flakes in the layer of the solidified ink-paint colorant. In the second step, a low concentration (preferably 0.1-15% by weight) of ink or paint is printed on top of the first printed image, exposed to magnetic fields, and cured. The ink and the colorant of the second layer are preferably transparent, but may be dyed. The magnetic pigment for the second layer may be the same as or different from that for the first layer. The size of the pigment for the second layer can be the same or different. The color of the pigment for the second layer may be the same as or different from that for the first layer. The shape or intensity of the field acting on the second layer may be the same, preferably different, allowing the observer to experience two different effects. The graphical pattern for the second layer can be the same or different. The combination of colors of the ink or pigment can highlight or weaken the particular color in the last printing step.

Complex patterns, such as lines, dots, semicircles, or other shapes, which stand out by the optical illusion effect in the present invention, can be used as a printing process to make a visually encrypted document difficult to copy for reproduction.

Substrates for two-step printing in connection with the present invention may be transparent or opaque. This is roughly determined by the graphics of the image and the required optical effects. If opaque halo is used, the first and second coating layers are printed or painted on the same side of the opaque substrate, with the image of the second coating layer on top of the first coating layer being more transparent. For transparent substrates, the first and second coating layers may be described in the same way as for opaque substrates, whereas preferably the first coating is printed on one side of the substrate with concentrated ink and the second coating with dilute ink. Can be printed on the opposite side of the substrate. For some purposes the first coating layer is a layer printed with dilute ink, and the layer of concentrated ink may be the second coating layer. The final image observation is done through the substrate.

In connection with an embodiment of the present invention, the first example of a print having two crossing rolling bars produces an optical effect similar to the shape of asterism. US Patent Application Nos. 2004-0051219 and 2005-0106367 to Raksha et al., Which are dispersed in an ink or a colorant, reflect light in a cylindrical convex or concave shape from magnetic particles arranged by a magnetic field. Disclosed is a rolling bar and a method of making a rolling bar having an effect by the same.

Clusters in gems are formed by small, parallel, thin fibers of dense inclusions in minerals, which are formed by the swirling shape of light, that is, by the dense light passing around when the mineral is rotated. Reflect light to form a star.

An image of a box printed by four-ray star or flexography with two rolling bars is shown in FIGS. 2C and 2D. The image with one rolling bar 202 shown in FIG. 2A is first printed on a clear, transparent or opaque substrate by an ink containing 25% by weight of a pigment that is color-shifted from green to gold, and convex Rolling bar 202 is formed by the applied magnetic field.

The second image shown in FIG. 2 is printed on the first image 201 with an ink containing a transparent developer (which is thereby transparent) in which 10% by weight of the pigment which turns from green to gold is dispersed as described above, and the convex rolling bar ( 204 is formed in a direction 90 degrees with the first printed rolling bar 202 as shown in FIG. 2A. The resulting printed image, FIG. 2C, shows a square star. When the star is rotated or its upper end is tilted horizontally in a direction away from the viewer, the star moves downward of the printed image as shown in FIG. 2D, and when the top is tilted toward the viewer. Moves upwards of the image. By tilting the image forward and backward in the direction indicated in FIG. 2D, both rolling bars appear to move simultaneously in a direction approaching and away from each other. By coating the substrate with two rolling bars in this manner, the function of each rolling bar is provided with the effect of giving the perception that it is rolled across the paper as it is rotated, so that the two bars move jointly, Even a small turn in one direction makes it appear to move in the other direction clearly. In this embodiment it is not necessary to move or tilt the paper in two directions to see the two bars move. One movement in one direction also provides for the two bars to move differently.

Referring to FIG. 3A, an image of the earth 310 is silk-screened with ink containing color pigments shifted from magenta to gold and containing 30% by weight of pigment with particles having an average size of about 22 microns. It is printed and exposed to a magnetic field to form a V-shaped flip-flop optical effect. Flip-flop effects are described in US Pat. Nos. 2004-0051297 and 2005-0106367 to Laksha et al., Incorporated herein by reference. In this effect, when viewed from a normal angle, the lower hemisphere below the Earth's equator is bright magenta, and the upper side is dark gold. The magnetic flakes at the bottom of the image are oriented according to the applied magnetic field, which sends the reflected light at right angles to the observer's eye, thereby making it appear bright. On the contrary, the particles above the Earth reflect light toward the observer's chest. The color of the flakes at this viewing angle and the color seen in the orientation of these particular particles is gold. The earth printed on the substrate, when its upper end is tilted away from the observer, the underlying flakes reflect light toward the observer's hat, making the color dark gold. At the same time, the flakes at the top of the earth reflect the incident light into the observer's eye, making it appear bright magenta. Tilting the sample in the opposite direction changes the color of the image.

As shown in FIG. 3B, the second image 302, "Test Text", is printed with a thin 10% by weight ink on top of the earth 301 and exposed to other magnetic fields that cause the magnetic particles to be roofed. The optical effect in this image printed by the particles thus oriented has a color change opposite to that of the first printed image. The pigment in the second ink is gold in magenta, as in the first image, but the particle size is close to 10 microns. The hue of this pigment is the same as that of the larger 22 micron pigment, but the saturation is less than the saturation of the larger pigment that formed the first layer, making it look slightly darker. At normal viewing angle, the resulting image 303 in FIG. 3C shows a transparent pale magenta "Text" on a dark gold background and a deep gold transparent "Test" on a light magenta earth background. If the print 303 is tilted in the direction in which its upper end is away from the viewer, the two parts of the earth and letters change their color, as shown at 304. The upper part of the earth becomes bright magenta with a dark gold "Text", and the lower part of the earth becomes dark gold with a bright magenta "Test".

The “Test Text” logo 401 shown in FIG. 4A was printed on top of the image 402 with the flip-flop effect described in the aforementioned patents. The image 402 was printed with a dark ink containing the magnetic pigment Al / M / Al (Al denotes aluminum, where M is a magnetically alignable material). The flip-flop may be formed by aligning the magnetic flakes in the solid organic medium in a V shape or a roof shape. With the V-shaped alignment of the resin particles, at the normal viewing angle the bottom 403 of the image 402 is bright and the top 404 is dark. A second image 405 is printed on the image 402. The image 405 shown in FIG. 4B was printed with a thin ink containing 5 weight percent gold shift-free magnetic pigment and placed in the field to form the optical characteristics of the rolling bar. Rolling bar 406 was formed near the top of the image. The ink was cured after the particles were aligned. Flip-flops and letters are easily visible through the top coating layer in the twice printed image 407 shown in FIG. 4D at normal viewing angles.

However, if the top tilts the printed image in a direction away from the viewer, the rolling bar moves to the bottom of the printed image 407, hiding the logo 401 and flip-flop as shown in FIG. 408). Image 501 as shown in FIG. 5A is flexographically printed with an ink comprising 20% by weight of a magnetic pigment on a transparent substrate 500 and loaded into the field to form a convex rolling bar optical effect 502. Placed and cured to fix the aligned magnetic particles. Flexo printing or flexo printing is a mechanical printing process that uses rollers and cylinders with a surface similar to surface printing, but with a flexible rubber-like surface that prints overhanging surfaces using much less ink. In this process, the ink dries quickly, causing the machine to run at high speed. The finished result has a very smooth surface finish with clear details and is often similar to rotary screen prints.

In FIG. 5B another image is printed with dilute ink, placed in the intestine to form a convex rolling bar 503, and cured to fix the particles at that location. The final print 505 shows an image with one rolling bar effect 506 at the normal viewing angle. If the sample is tilted in a direction away from the viewer, one rolling bar 506 is divided into two rolling bars 507 and 508 moving in different directions. By tilting the image 507 back at a normal angle, the rolling bars 507 and 508 simultaneously produce one optical effect. Both images printed may have the same shape as shown in FIG. 5D or may have different images.

6A and 6B show a very attractive image for making a security label on a curved surface. As shown in Figures 6a and 6b, a bottle for packaging medicine is a good example of using a separate rolling bar. The bottle 601 has a label 602 glued to its surface. A security feature 603 with a separate rolling bar described in the above embodiment is printed on top of the label 602. The security feature 603 has one rolling bar 604 at a normal viewing angle. The bottle includes a broad line 605 formed by reflecting light from the circumferential surface of the incident bottle. However, the rolling bar 604, which also appears to be reflected off the circumferential surface, is inclined 90 degrees with respect to the line 605. Tilt the bottle 601 away from the viewer to separate the rolling bar 604 into two rolling bars 606 and 607. When the bottle is tilted again, the rolling bars 606 and 607 merge again into one rolling bar 604.

7A and 7B, the micrograph, FIG. 7A, shows the directivity of the grooves of the pigments of the first layer formed by diffractive particles in a carrier whose orientation is set up and down (or vice versa) using a magnetic field. After the first printed layer has been cured, a second print is made over the first printed layer which is oriented from left to right using the magnetic field (or vice versa). The camera used to photograph the micrograph, FIG. 7B, is focused to show the direction of the second groove of the finely structured particles. Note that the load of the second coating is low compared to the load of the first coating.

It is to be understood that in the following figures or embodiments, oriented flakes may be used with or instead of other types of flakes described so far.

The embodiments described so far have been examples in which two steps of coating are carried out on the same side or the other side of a substrate, but using a first alignable flake coating on the first substrate and a second with the same or different printed or etched images. Bonding onto a substrate is also less preferred but is included in the technical spirit of the present invention. For example, as a first step a rolling bar may be printed on the first substrate, which may then be bonded onto the holographic image, where one substrate should be inherently somewhat transparent.

In another less preferred embodiment of the present invention, two coatings are made on different sides, the second coating being a viscous coating in which the coating liquefies when energy, such as light above a predetermined wavelength, is applied. The first coating is a standard coating that is magnetizable and can be aligned when a magnetic field is applied. After the first coating is cured, the flakes are permanently aligned and the second coating is cured after liquefying enough to align the flakes.

Of course, many other embodiments of the invention can be appreciated without departing from the spirit and scope of the invention.

As described above, the present invention can provide a more complex image having at least two unique features, each of which is present in a separately formed coating.

According to another aspect of the present invention, when the image moves in one direction, the two images move together, but at least two coatings that appear to look different, each having at least two unique features present in the coatings formed separately. More complex images can be provided.

Claims (14)

Applying a first coating capable of setting directivity to the first side of the substrate using a magnetic field or an electric field to impart orientation along the magnetic field lines to the flakes in the coating; After the first coating has been cured, subsequently applying a second magnetic coating on top of the first coating or on the second side of the substrate using a magnetic or electric field to impart the lamellae in the second coating along the magnetic field line; Coating method. The method of claim 1, The magnetic field for directing flakes in the first magnetic coating is the first magnetic field, and the first magnetic field is used to direct the flakes in the second coating. The method of claim 1, The magnetic field for directing flakes in the first magnetic coating is the first magnetic field and the magnetic field for directing flakes in the second coating is the second magnetic field. The method of claim 1, The first and second magnetic fields are formed by another magnet or magnetic field generating system. The method of claim 1, One of the first and second coatings has a different concentration. The method of claim 5, One of the first or second coatings comprises a multilayer of optically variable flakes and the other includes diffractive flakes, at least a portion of the diffractive flakes having an embossed surface pattern formed on the surface Way. The method of claim 1, Material coating method, in which a two-step production process is used. Applying a first coating on the first side of the substrate; Applying a magnetic field to align particles in a first coating into a predetermined form; Allowing the first coating to cure or dry; Applying a second coating on top of the first coating or on the other side of the substrate; Applying a magnetic field before the second coating is cured or dried to align the particles in the second coating; Image generation method comprising a. The first optical characteristic whose appearance changes as the angle of observation or light incident on the image changes, and the second optical characteristic whose appearance changes as the light incident on the viewing angle or image changes independently of the first optical characteristic. Wherein the first feature comprises a first coating that is magnetically alignable and the second feature comprises a second coating having magnetically alignable flakes that are oriented differently from the flakes of the first coating. In a method of forming an image on a substrate, Applying a first optical effect coating to the first side of the substrate using a magnetic or electric field to direct the flakes in the coating independently of the field; Applying a second optical effect coating on top of the first coating or on the second side of the substrate, wherein the effects or combined effects of both coatings are visible at least on one side of the substrate. A first coating comprising an aligned optical foil that provides color and reflectance diffraction changes with a viewing angle, on which a second coating having optically discernible features is supported, the first and second coatings being at least on one side of the substrate. A substrate that supports an observable image. The method of claim 11, The second coating is a substrate that is a coating of aligned optical flakes. The method of claim 12, Each of the first and second coatings forms a unique image, wherein each unique image is formed by magnetically aligning optical flakes. The method of claim 6, The first and second coatings include diffractive flakes having a surface relief pattern formed therein or thereon, wherein the flakes of the first coating are oriented along the surface relief pattern having a different orientation than the diffractive flakes of the second coating. .

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