RU2725793C1 - Method of producing a multilayer polymer protected article with an identifying optically variable image with instrument-determined features and a multilayer article with an identifying optically variable image - Google Patents

Abstract

FIELD: protective technologies for printing products.SUBSTANCE: invention relates to the field of protective technologies for various types of printing products, including protected documents from composite multilayer polymer materials. Method of producing a multilayer polymer protected article with an identifying optically variable image with instrument-determined features is that a thermoplastic polymer film is coated with a metallized reflective layer and at least one diffraction structure in the form of a synthesized hologram comprising at least one instrument-determined element with a synthesized microrelief, providing during its illumination with laser radiation in a plane parallel to the plane of the diffraction structure, forming an image, wherein the film is partially demetallised to obtain a semitransparent film with a pixel matrix with metal removal of 65–70 % of the area in different regions and on sections free of the diffraction structure, method includes sintering all polymer layers when placing said polymer film with protective structures formed thereon into a structure of a multilayer polymer article made by glueless technology by sintering, and image recording is carried out by focused laser radiation with partial destruction of metallized diffraction grating due to modulation of intensity, duration and number of laser pulses.EFFECT: invention simplifies the method of producing an optically variable image while enabling generation of images in one layer and high security owing to presence of instrument-determined features.10 cl, 3 dwg, 6 ex

Description

The invention relates to the field of protective technologies for various types of printing products, including a protected document from composite multilayer polymeric materials.

To protect against falsification of such documents, they record personal information about the owner of the document. The portrait of the owner, his biometric data, the date and place of issue of the document are recorded in the document.

To verify the authenticity of this information is usually provided with complex protective elements, allowing the possibility of visual and / or instrument control. In many cases, in addition to the basic information, additional images are recorded, for example, a duplicate portrait, especially a color one.

A number of original technologies for recording color images are known, available only to a limited number of specialists (RU 2286888. C2 10.11.2006), which consist in recording a multilayer structure containing dyes that change color under the influence of laser radiation, or technology for layered laser engraving of a multilayer structure containing a sequence layers of pigments of different colors (US 7763179 B2 07/27/2009), or a method of manufacturing a combined protective element on a multilayer polymer structure (RU 2480550 C1 04/27/2013), the disadvantage of such technological solutions is the need to use multilayer materials with special properties, which complicates their industrial application.

There is a method for obtaining full-color holographic images RU 2079167 C1 05/10/1997. A full-color image is formed by a flat matrix created in a multilayer structure. The authenticating image is color, has a raster structure and is formed by removing in certain areas of the material to a depth of either only the upper or upper and middle opaque layers using laser engraving. The disadvantage of the proposed solution is that, to see such an image is possible only with special lighting.

A known method of obtaining a combined black and white and full-color personalized image on a multilayer structure RU 2556328 C1 07/10/2015. When implementing the method, the image pixels are divided into subpixel areas, each of which represents a diffraction grating that reflects one of the primary colors. The image is formed by partial destruction of the diffraction gratings. The disadvantage of this solution is the combination of high-precision technological solutions and, as a result, the complexity of implementing the method in an industrial environment.

The closest technical solution is the solution described in patent RU 2566421 C1 10.27.215. The invention relates to a multilayer polymer product, in one of the layers of which color images are recorded in the form of translucent pixel arrays consisting of elements - pixels with sub-pixel structures consisting of areas with metallized diffraction gratings, the reflectivity of which at given lengths of color waves is changed during product individualization by methods laser engraving of diffraction gratings with precise registration of the laser beam to the area of their location. The disadvantage of this technical solution is the complexity of the formation of the sub-pixel matrix, the need for high-precision register of the laser beam and insufficient security of the product.

The problem solved by the invention is the creation of a multilayer polymer protected product with an identifying optically variable image containing at least one instrument-detectable feature.

The technical result consists in simplifying the method of obtaining an optically variable image, while providing the possibility of forming images in one layer and increasing security due to the presence of instrument-detectable features.

The problem is solved, and the technical result is achieved by the fact that a metallized reflective layer and a diffraction structure are applied to a thermoplastic polymer film in the form of a rainbow hologram containing instrument-defined elements with synthesized micro-relief in some parts.

In the particular case, the instrument-defined element is a hidden micro-optical structure, part of the area of which consists of fragments of kinoforms, which forms a 2D image used for instrument control when illuminated by laser radiation.

To control the latent image, a portable detector is used to visualize the image when illuminated by a laser diode. The microrelief of the optical element is calculated so that when exposed to laser radiation in the plane parallel to the plane of the optical element, an image is formed.

In a particular case, the instrument-detecting element may contain a multi-gradation kinoform, which forms an asymmetric image when illuminated with coherent radiation, which is also suitable for automated control.

The automated control device has detectors located in the focal plane that form the image. The analysis of the image, the allocation of the security feature and its comparison with the standard is carried out by a microprocessor. The automated control procedure is invariant with respect to the shift or rotation of the device relative to the optical element.

In a particular case, a device-detecting element for automated authentication may consist of areas controlled by a smartphone. The hardware-software complex can be a kinoform synthesized on a computer with a specially developed software application for smartphones. The recognition procedure is performed using a smartphone camera that captures the image and performs its automatic recognition.

In the particular case, the instrument-defined elements are microtexts from 300 to 50 microns in size, as well as nanotexts from 50 to 5 microns in size, controlled by special optical devices, in particular, by a microinterferometer.

In a particular case, the diffraction structure may contain an additional element, which is manifested at angles of inclination of more than 40 ° and contains a micro-optical system with 2D images consisting of color fragments, and diffraction gratings with periods from 0.35 to 0 are used to form a 2D image. 55 microns with a microrelief depth from 140 to 240 nm.

In a particular case, the diffraction structure for visual authentication based on the diffraction optical element at specified parameters provides the formation of an image for the observer, consisting of color elementary regions, with a typical size of less than 150 μm, which loses color when the microoptic system rotates through 180 °, becomes gray and / or disappears, and when the micro-optical system is tilted at angles of more than 60 ° and large diffraction angles, the observer sees a color image formed by diffraction gratings on the entire surface of the micro-optical system.

These additional security elements can be located in different parts of the diffraction structure and applied one at a time, and all together.

A polymer film containing a metallized layer, a diffraction structure such as a rainbow hologram with additional security features is demetallized to obtain a translucent film with a pixel matrix with the removal of metal at 65-70% of the area in different areas to obtain different structures:

- mesh, where various geometric shapes can be located inside the mesh - hexagon, honeycomb, squares, chess, circles, mesh;

- pixels of various geometric shapes, such as squares, circles, stars, and other shapes;

- a set of lines, such as straight, curved, including with a variable line thickness,

- and / or any combination thereof.

In the particular case, the demetallization of the film is carried out by masking and subsequent etching of the matrix structures with the formation of pixels.

As a result of the demetallization process, the metallized sections of the diffraction structure are located at a distance from each other so that in areas free of diffraction structures, the polymer layers are sintered during its manufacture.

The structure of the demetallized elements may constitute a code determined by the light or reflection due to the contrast of the demetallized elements of the substrate.

In a particular case, UV or IR - luminescent substances are additionally applied to a thermoplastic polymer film under a diffractive structure.

A polymer film with protective structures created on it is included in the composition of a multilayer polymer product manufactured by glueless technology by sintering, followed by the formation of a holographic optical portrait on it with instrument-defined features.

In a particular case, a layer with a translucent pixel matrix is located above the layer with personal graphic and text data.

Image recording is performed by focused laser radiation. The image is formed due to the partial destruction of the metallized diffraction grating. The destruction of the lattice is carried out by laser engraving due to the modulation of the intensity, duration and number of laser pulses. The optically variable image due to the high reflectivity and absorption capacity is visualized at different viewing angles. When observing the surface of the product at different angles, a change in the metallized image to an image with a rainbow effect is observed.

A multilayer polymer identification product with a holographic optically variable portrait with instrument-defined features is obtained by sintering polymer layers. Good adhesion of the layers is ensured by a translucent film containing discharged structures and metallization elements with 65 -70% lack of metal area. In case of delamination of the product, the protective element is destroyed.

The creation of instrument-defined structures in various parts of diffraction gratings provides the possibility of introducing several visual and instrument-detectable features simultaneously into one product.

In FIG. 1 shows a diagram of observing a visual effect when illuminating a diffraction structure with “white light”.

In FIG. 2 shows a view when illuminating the diffraction structure with “white light” at angles of inclination of the substrate relative to the observer less than 40 °. The observer sees the reconstructed image of the main channel.

In FIG. 3 shows a view at angles of inclination of the substrate of more than 40 °. The observer sees an additional color image, the second channel.

The invention is illustrated by examples.

Example 1

A multilayer polymer protected product with an identifying optically variable image was made, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief representing microtext 300 microns in size and 5 microns nanotext controlled by a microinterferometer, a diffractive structure that forms when illuminated laser image 2D image used for instrument control, as well as structures for visual authentication, which are manifested when the micro-optical system is rotated 180 ° and tilted at angles of more than 60 ° and consists of areas with a typical size of less than 150 microns, diffraction structures, containing gratings with a period of 0.35 μm with a microrelief depth of 140 nm, which form a color image with an inclination angle of more than 40 °. An identifying optically variable image provides image formation when it is illuminated by laser radiation in a plane parallel to the plane of the diffraction structure, while the film is partially demetallized to produce a translucent pixel matrix film with metal removal over 65% of the metal area. In this case, the structure obtained after demetallization is mesh, where circles form inside the mesh.

The obtained polymer film with the protective elements created on it was placed in the structure of a multilayer polymer product manufactured by glueless technology. Image recording was performed by focused laser radiation due to partial destruction of the metallized diffraction grating.

Example 2

A multilayer polymer protected product with an identifying optically variable image was made, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief, which is 250 microns microtext and 10 microns nanotext, controlled by a microinterferometer, a diffraction structure that forms when illuminated by laser radiation, a 2D image used for instrument control, as well as a structure for visual authentication, containing gratings with a period of 0.4 μm at a microrelief depth of 200 nm, which form a color image at an angle of inclination of more than 40 °. An identifying optically variable image provides, when it is illuminated by laser radiation, an image formation in a plane parallel to the plane of the diffraction structure, the film being partially demetallized to obtain a translucent film with a pixel matrix with the removal of 68% of the metal area. In this case, the pixel matrix is obtained in the form of a geometric figure - a square.

The obtained polymer film with the protective elements created on it was placed in the structure of a multilayer polymer product manufactured by glueless technology. Image recording was performed by focused laser radiation due to partial destruction of the metallized diffraction grating.

Example 3

A multilayer polymer protected product with an identifying optically variable image was made, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief, which is microtext 100 microns in size and 20 microns nanotext, controlled by a microinterferometer, a diffractive structure that forms when illuminated laser image 2D image used for instrument control, as well as structures for visual authentication, which are manifested when the microoptical system is rotated 180 ° and tilted at angles of more than 60 ° and consists of areas with a typical size of less than 150 microns, diffraction structures, containing gratings with a period of 0.45 μm with a microrelief depth of 200 nm, which at an angle of inclination of more than 40 ° forms a color image. An identifying optically variable image provides, when illuminated by laser radiation, an image is formed in a plane parallel to the plane of the diffraction structure, and the film is partially demetallized to obtain a translucent film with a pixel matrix with the removal of 70% of the metal area. The pixel matrix is formed by a set of curved lines with a variable thickness.

The obtained polymer film with the protective elements created on it was placed in the structure of a multilayer polymer product manufactured by glueless technology. Image recording was performed by focused laser radiation due to partial destruction of the metallized diffraction grating.

Example 4

A multilayer polymer protected product with an identifying optically variable image was made, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief, which is 270 microns microtext and 50 microns nanotext, controlled by a microinterferometer, a diffractive structure that forms under illumination laser image a 2D image used for instrument control, as well as a structure for visual authentication, containing gratings with a period of 0.55 μm with a microrelief depth of 240 nm, which at a tilt angle of more than 40 ° forms a color image. An identifying optically variable image provides, when it is illuminated by laser radiation, an image formation in a plane parallel to the plane of the diffraction structure, and the film is partially demetallized to obtain a translucent film with a pixel matrix with the removal of 70% of the metal area. Moreover, the structure of the pixel matrix after demetallization is obtained in the form of cells formed by lines of variable thickness and stars.

Example 5

A multilayer polymer protected product with an identifying optically variable image was made, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief, which is 240 microns microtext and 10 microns nanotext, controlled by a microinterferometer, a diffraction structure, which is a probe-defined feature containing a multi-gradation kinoform detected by a portable detector that allows you to visualize the image when illuminated by a laser diode, as well as a structure for visual authentication, which manifests itself when the micro-optical system is rotated through 180 ° and tilted at angles of more than 60 ° and consists of areas with a typical size less than 150 microns, diffraction structures containing gratings with a period of 0.35 microns with a microrelief depth of 140 nm, which at a tilt angle of more than 40 ° form a color image. An identifying optically variable image provides image formation when it is illuminated by laser radiation in a plane parallel to the plane of the diffraction structure, while the film is partially demetallized to obtain a translucent film with a pixel matrix with the removal of 65% of the metal area. In this case, the structure obtained after demetallization is mesh, where circles form inside the mesh.

Example 6

A multilayer polymer protected product with an identifying optically variable image was manufactured, consisting of a thermoplastic polymer film with a metallized reflective layer deposited on it, containing a synthesized microrelief representing 250 microns microtext and 7 microns nanotext controlled by a microinterferometer, an instrument-defined diffraction structure for automated control consisting of areas controlled by a smartphone, as well as a structure for visual authentication, which manifests itself when the micro-optical system is rotated through 180 ° and tilted at angles of more than 60 ° and consists of areas with a typical size of less than 150 microns, diffraction structures containing gratings with a period of 0.43 μm with a microrelief depth of 160 nm, which form a color image with an inclination angle of more than 40 °. An identifying optically variable image provides, when it is illuminated by laser radiation, an image formation in a plane parallel to the plane of the diffraction structure, and the film is partially demetallized to obtain a translucent film with a pixel matrix with the removal of 70% of the metal area. The pixel matrix is formed by a set of curved lines with a variable thickness.

The obtained polymer film with the protective elements created on it was placed in the structure of a multilayer polymer product manufactured by glueless technology. The image was recorded with focused laser radiation due to the partial destruction of the metallized diffraction grating.

Claims (14)

1. A method of manufacturing a multilayer polymer protected product with an identifying optically variable image with detectable features, comprising applying to a thermoplastic polymer film a metallized reflective layer and at least one diffraction structure in the form of a synthesized hologram containing at least one instrument-defined element with a synthesized microrelief, providing, when illuminated by laser radiation in a plane parallel to the plane of the diffraction structure, image formation, the film is partially demetallized to obtain a translucent film with a pixel matrix with the removal of metal for 65-70% of the area in different areas and in areas free of diffraction structure, then all polymer layers are sintered when this polymer film is placed with the protective structures created on it into the structure of a multilayer polymer product manufactured by glueless technology by sintering I, and the image is recorded by focused laser radiation with partial destruction of the metallized diffraction grating due to the modulation of the intensity, duration and number of laser pulses, while the instrument-defined elements with the synthesized microrelief are microtexts in size from 300 to 50 microns, as well as nanotexts in size from 50 to 5 microns, controlled by optical instruments, in particular by a microinterferometer, as well as structures for visual inspection, consisting of areas with a typical size of less than 150 microns, which, when the micro-optical system is rotated through 180 ° and the micro-optical system is tilted by more than 60 °, provide visible color image, and / or structures that appear at tilt angles of more than 40 ° and contain diffraction gratings with a period from 0.35 to 0.55 μm with a microrelief depth of 140 to 240 nm. 2. The method according to p. 1, characterized in that the instrument-defined sign is a hidden diffraction structure, part of the area of which consists of fragments of kinoforms, which forms a 2D image used for instrument control when illuminated by laser radiation. 3. The method according to p. 1, characterized in that the device-defined features are elements containing multi-gradation kinoform detected by a portable detector that allows you to visualize the image when illuminated by a laser diode and / or microscope. 4. The method according to claim 1, characterized in that the identifiable sign for automated authentication includes areas controlled by a smartphone. 5. The method according to p. 1, characterized in that after demetallization receive a structure selected from the series: - mesh, where various geometric shapes are located inside the mesh - hexagon, honeycombs, squares, chess, circles, mesh, - in the form of pixels of various geometric shapes, such as squares, circles, stars, other shapes, - in the form of a set of lines, such as straight, curved, including with a variable line thickness, and / or any combination thereof. 6. The method according to p. 1, characterized in that the demetallization of the film is carried out by masking and subsequent etching of the matrix images with the formation of a pixel structure. 7. The method according to p. 1, characterized in that the structure of the demetallized elements is a code determined by the lumen or reflection due to the contrast of the demetallized elements of the substrate. 8. The method according to p. 1, characterized in that the thermoplastic polymer film under the diffraction structure is additionally coated with UV or IR luminescent substances. 9. A multilayer product with an identifying optically variable image, including a thermoplastic polymer film with a metallized reflective layer and containing in one of the layers personal graphic and text data, such as security paper, banknote, a document obtained by the method described in any of paragraphs. 1-8. 10. A multilayer product according to claim 9, characterized in that the thermoplastic polymer film with a metallized reflective layer is located above the layer with personal graphic and text data.

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