RU2386544C1 - Protective element based on transparent polymer film, method of its manufacturing and printing produce with such elements - Google Patents

Abstract

FIELD: technological processes; flaky items.

SUBSTANCE: invention is related to the field of protective technologies for counterfeit protection of certifying documents, credit cards, bank notes and securities that include plastic structures with protective criteria. Protective element for printing produce comprises multilayer transparent polymer film with the first halftone image arranged on upper surface of upper film layer with resolution of the same order as film thickness has, and the second halftone image arranged on lower surface of one of underlying layers of polymer film and/or on surface of protected produce, on which protective element is arranged, besides the second halftone image is arranged so that whenever images are observed for reflection at various angles or in clear space, observed image gradually changes from positive to negative one or vice versa, at the same time the first and second halftone images are arranged as transparent and/or semi-transparent, and/or luminescent, and/or relief ones. Method for production of protective element includes application of images on surface of film layers by methods of local carbonisation and/or engraving with the help of laser beam in surface layers of film with thickness of 1-10 micrometre, and/or methods of thermodiffusion copying.

EFFECT: invention makes it possible to execute individual marking of finished document form in a single cycle of variable images development in polymer film.

13 cl, 4 dwg

Description

The invention relates to the field of security technologies designed to protect against forgery of identification documents, credit cards, banknotes and securities, including plastic structures with security features.

Known technical solutions for the protection of plastic documents by manufacturing them in the form of multilayer thin-film structures in which the recording of identifying images and text is performed in different layers and on different surfaces of the polymer layers. At the same time, specific optical effects are achieved when viewing images and text at different viewing angles and different lighting angles.

For example, in the application US 2005/0035590 A1, 02.17.2005, an identification document is proposed, made in the form of a multilayer polymeric material, on various surfaces of which various images are applied. Images are applied to the surface of individual layers prior to the formation of a multilayer structure by known printing methods. This method of labeling is inconvenient, and in many cases not applicable, because individual marking of the document is often required, i.e. carrying out his personalization. Drawing images on the surface of the layers is advisable to carry out in the process of one cycle of personalization of the finished form of the document.

A similar technical solution is proposed in patent EP 1780682 A1, October 30, 2006, where the layers with identifying images are made in a marked document and in a special identifying device (filter), which must be combined with the surface of the marked document during identification. Such a solution for personalizing documents is extremely inconvenient both when marking and when checking identification tags.

Closest to the claimed technical solution is the invention according to the application WO 00/00356, 01/06/2000. The closest analogue describes a security element for printing products, in which at least two images are made on the surface of the product, separated from each other by a layer of transparent material. The thickness of the material layer and the distance between two adjacent image elements are selected in such a way that when the viewing angle changes, the observed image changes (the so-called moire effect). However, even in this solution, the images are applied to the surface of the layers of the multilayer polymer structure not in a single personalization cycle of the identification form.

The objective and technical result of the invention is to obtain a protective element that allows personalization (individual marking) of the finished document form in a single cycle by creating mutable images in a polymer film.

The problem is solved as follows. The security element for printing products, such as valuable documents, banknotes, credit cards, identification documents, contains a multilayer transparent polymer film with the first rasterized image made on the upper surface of the upper layer of the film with a resolution of the same order as the film thickness and the second rasterized image different from the first rasterized image, made on the lower surface of one of

the underlying layers of the polymer film and / or on the surface of the product to be protected, on which the protective element is located, the second rasterized image being arranged in such a way that when observing the images for reflection at different angles or in the lumen, the observed image smoothly changes from positive to negative or vice versa, when the first and second rasterized images are made transparent, and / or translucent, and / or reflective, and / or luminescent, and / or embossed.

Additionally, the security element is characterized in that

- the first and second rasterized images are made using linear rasterization;

- in the first rasterized image, the rasterized linear elements are phase shifted depending on the gray level of the rasterized halftone pattern;

- the second rasterized image is made by screening elements of various colors;

- the first rasterized image is made on the upper surface of one of the underlying layers, and the first rasterized image is located above the second rasterized image.

The result is also achieved using a method of manufacturing a protective element for printing products, including applying rasterized images on the surface of the layers of a transparent polymer film so that the first rasterized image is applied to the upper surface of the upper layer of the film with a resolution of the same order as the film thickness, and the second rasterized an image different from the first rasterized image is applied to the lower surface of one of the underlying layers of the polymer film and / or to the surface be protected product on which the security element, the image drawing is performed by methods local carbonization and / or engraving using a laser beam in the surface layers of the film thickness of 1-10 microns, and / or copying methods thermodiffusion.

Additionally, the method is characterized in that

- the first and second rasterized images are performed using linear rasterization;

- in the first rasterized image, the rasterized linear elements are phase shifted depending on the gray level of the rasterized halftone pattern;

- the second rasterized image perform screening elements of various colors;

- the first rasterized image is applied to the upper surface of one of the underlying layers, placing the first rasterized image above the second rasterized image.

The problem is also solved with the help of printing products containing protective elements, characterized as described above.

The claimed protective element is made by the claimed method as follows.

Figure 1 presents a diagram of the application of rasterized images on a printed product with a protective element, which shows:

1 - laser

2 - lens

3 - beam

4 - image

5 - top layer

6 - adhesive layer,

7 - a layer lying below layer 5.

Figure 2 presents an example of the original photographic image.

Figure 3 shows rasterized images of portions of the original image having the same blackening density (16 gradations of blackening).

Figure 4 - the final rasterized image on the protective element.

Images and text data can be applied to a polymer multilayer structure using a focused laser beam that scans the film surface (engraving), local carbonization methods, or double-sided printing methods, for example: thermal diffusion copying, which allows you to create specified rasterized images on various surfaces of a multilayer polymer structure.

Example 1

The upper image is recorded in the upper layer of the finished multilayer transparent structure, and this multilayer structure is glued to the underlying layer using an adhesive with a high refractive index. When recording (Fig. 1), beam 3 of laser 1 focused by lens 2 forms an image 4 only in the upper layer 5 of the multilayer structure, and recording does not occur in the lower layers, because the laser beam is reflected from the interface in the region of the adhesive layer 6. To form the image in the upper layer of the finished multilayer structure, it is necessary that the wavelength of the laser radiation, the refractive indices and absorption of the transparent layers 5 and 7 and the adhesive layer 6 are selected so that the recording occurs only in the upper layer from the side of the incident ray.

In one of the transparent layers below, at some distance from the upper image, a second rasterized image 8 is formed, for example, a spatial lattice with a given spatial period, duty cycle, a certain phase and orientation relative to the rasterized image in the upper layer.

The lower rasterized image can be formed when recording with a laser beam from the lower side of the structure, or when the laser beam is refocused on the lower surface of the polymer structure, or can be printed by two-sided printing methods, for example, thermal diffusion copying, or use preliminary deposition on the upper surface of the lower layer until it is glued together (lamination) with the upper transparent layers of the raster image that does not contain individual information, does not will need for personalization, which in this case is written only on the upper surface of the top layer of the polymeric structure.

When observing images from different angles, certain areas of the upper image are darkened by the lower ones, as a result of which the images observed at light or reflection at different spatial angles will smoothly change from negative to positive or vice versa. This effect of smooth image change is achieved if the resolution of the screening is comparable in magnitude with the film thickness.

Example 2. All methods repeated as example 1, but the first rasterized image was made on the upper surface of one of the underlying layers, the first rasterized image being located above the second rasterized image. This is advisable, for example, if the upper layers perform the function of protection against mechanical and / or chemical influences. In addition, if a thin layer of foil is placed on the upper side of the lower layer, which is destroyed when trying to peel off the lower layer, the protective element acquires the function of additional protection, which records attempts to paste (splitting a plastic document).

Example 3. All methods were repeated as example 1, but the first rasterized image was performed on the upper surface of one of the underlying layers, the first rasterized image being located above the second rasterized image. This is advisable, for example, if the upper layers perform the function of protection against mechanical and / or chemical influences. In addition, if a thin layer of thermal varnish with a topographic image is destroyed on the upper side of the lower layer and is destroyed when trying to peel off the lower layer, the protective element acquires the function of additional protection, which registers attempts to paste (splitting a plastic document).

The proposed technical solution uses the original screening of the upper image (portrait photographic image) in the form of a symmetric lattice (the dark strip is equal in thickness to transparent) with a certain spatial frequency equal to the spatial frequency of the symmetric lattice in the lower layer, but the phase shift in the upper lattice is not uniform surface and varies within one half-cycle depending on the degree of blackening in the vicinity of the considered image point. Figure 2 shows the original image - the original, figure 3 - rasterized images of portions of the original image having the same blackening density (16 gradations of blackening), and Fig. 4 - the final rasterized image formed in the upper layer of the structure of the protective element.

The raster stripes in the lower figure can be made in color, in this case, when observing the upper image at different angles, the color of the image will change.

The presence of changes in the contrast and color of the observed picture (the observed smooth transition from a positive to a negative image and vice versa) with a change in the viewing angle is a characteristic protective feature that is difficult to replicate and simulate without special expensive equipment.

In addition, if a thin layer of foil, paint, a sprayed metal layer or a holographic layer with a holographic image is destroyed on the upper side of the lower layer, which is destroyed when an attempt to peel off the lower layer, the protective element acquires the function of additional protection, which registers attempts to paste (splitting a plastic document).

Claims (13)

1. A security element for printing products, such as valuable documents, banknotes, credit cards, identification documents, comprising a multilayer transparent polymer film with a first rasterized image made on the upper surface of the upper layer of the film with a resolution of the same order as the film thickness, and a second rasterized image, different from the first rasterized image, made on the lower surface of one of the lower layers of the polymer film and / or on the surface of the protected product and on which the security element is located, the second rasterized image being positioned in such a way that when observing the images for reflection at different angles or in the clearance, the observed image smoothly changes from positive to negative or vice versa, while the first and second rasterized images are made transparent, and / or translucent, and / or reflective, and / or luminescent, and / or embossed. 2. The security element according to claim 1, characterized in that the first and second rasterized images are made using linear rasterization. 3. The protective element according to claim 1 or 2, characterized in that in the first rasterized image, the rasterized linear elements are phase shifted depending on the gray level of the rasterized halftone pattern. 4. The security element according to claim 1 or 2, characterized in that the second rasterized image is made of screening elements of various colors. 5. The security element according to claim 3, characterized in that the second rasterized image is made of screening elements of various colors. 6. A security element according to any one of claims 1, 2, 5, characterized in that the first rasterized image is made on the upper surface of one of the lower layers, the first rasterized image located above the second rasterized image. 7. A method of manufacturing a protective element for printing products, comprising applying rasterized images on the surface of the layers of a transparent polymer film so that the first rasterized image is applied to the upper surface of the upper layer of the film with a resolution of the same order as the film thickness, and the second rasterized image is excellent from the first rasterized image, applied to the lower surface of one of the lower lying layers of the polymer film and / or to the surface of the protected product, on which a protective element has been placed, images are applied by local carbonization and / or engraving using a laser beam in the surface layers of a film with a thickness of 1-10 microns and / or by thermal diffusion copying. 8. A method of manufacturing security elements according to claim 7, characterized in that the first and second rasterized images are performed using linear rasterization. 9. A method of manufacturing security elements according to claim 7 or 8, characterized in that in the first rasterized image, the rasterized linear elements are phase shifted depending on the gray level of the rasterized halftone pattern. 10. A method of manufacturing a security element according to claim 7 or 8, characterized in that the second rasterized image is performed by screening elements of various colors. 11. A method of manufacturing security elements according to claim 9, characterized in that the second rasterized image is performed by rasterizing elements of various colors. 12. A method of manufacturing security elements according to any one of claims 7, 8, 11, characterized in that the first rasterized image is applied to the upper surface of one of the lower layers, placing the first rasterized image above the second rasterized image. 13. Printing products containing protective elements, characterized in any one of claims 1 to 6.

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