RU2791765C1 - Multi-layer structure for protecting identification documents and identification document - Google Patents

Abstract

FIELD: identification document protection.

SUBSTANCE: group of inventions relates to a multilayer structure for protecting identification documents and to identification document in form of a passport book containing such a multilayer structure. The multilayer structure includes a removable base film, on one of the sides of which are successively applied: a separating layer, a relief-receiving layer with a diffractive protective element, a demetallized layer of aluminium or copper or nickel with local opaque zones, a reflective layer of zinc sulphide or indium oxide - tin, a printing ink layer and an adhesive layer for fixing the structure on the protected document, while the thickness of the adhesive layer is from 0.2 to 12 microns, the thickness of the relief-receiving layer with a diffractive element is from 0.1 to 10 microns.

EFFECT: inventions improve the reliability of document authenticity identification by increasing the brightness of the imaginary image being restored, as well as increasing the speed of document processing.

7 cl, 4 ex

Description

The invention relates to an information carrier, preferably an identification document, provided with a structure with optically variable properties and a laminating non-film material for protection against unauthorized opening and forgery.

To protect valuable documents, such as a passport, and other printed products, optically variable means deposited on their surface, for example, a diffraction grating, a hologram, or other optical microstructures, are widely used.

Known solution RU 2461882, 10.03.2011, the technical result of which is to increase the information security of the document by introducing into the hologram the individual features of the document. This solution seems technically difficult to implement and, as shown below, each specific document has its own optical image distortions that do not allow achieving the required level of system signal modulation accuracy without a reference signal.

Known solution RU 2361252, 27.04.2008, describing the information carrier with an inner layer and at least one adjacent layer laminated to the inner layer, and a method for its manufacture. Said inner layer is made of a holographic information storage medium in the form of a volumetric hologram. The surface of the layer adjacent to the inner layer facing the inner layer has a roughness prior to lamination on the inner layer, which causes a shift in the wavelength of the image reconstructed by the fixed distortion volume hologram. EFFECT: increased protection against falsification by creating a complicated optical system with double diffraction of the reflected wave.

According to the authors, this technical solution is the closest analogue of the claimed invention. The disadvantage of the known technical solution is the serious problem of combining flat and volumetric holograms to obtain a low-noise reconstructed wave reflected from the carrier, which is unattainable in mass production.

It has been empirically established that when applying a diffractive protective relief fixed in amplitude (relief-phase "flat hologram"), due to the amorphous surface of the paper, consisting of fibers of different lengths and orientational arrangement, both phase and amplitude, and sometimes frequency distortions of the reconstructed image.

The main idea of the claimed invention is the creation of an optical system, the average signal error of the reconstructed image at all points of which would allow minimal influence or complete elimination of noise from the amorphous surface of paper or other rough substrate.

The problem solved by the invention is to increase the reliability of identifying the authenticity of a document by increasing the brightness of the imaginary image being restored, as well as increasing the speed of document processing by inspection specialists.

This is achieved by the fact that a multilayer structure is proposed for protecting identification documents, including a removable base film, on one of the sides of which are successively applied: a separating layer, a relief-receiving layer with a diffractive protective element, a demetallized layer of aluminum or copper or nickel with local opaque zones, a reflective layer of zinc sulfide or indium-tin oxide, a printing ink layer and an adhesive layer for fixing the structure on the protected document.

In particular cases, the demetallized layer may be coated with a polymer layer.

In particular cases, the printing ink layer is an iridescent ink, and / or luminescent ink, and / or color-changing ink, and / or sublimation ink in any combination, applied both with a die and in the form of local elements.

The base film can be made with the possibility of removal with partial wear.

The printing ink layer may include images that respond when excited by ultraviolet light, infrared light, an external magnetic field, or thermal radiation.

Also proposed is an identification document in the form of a passport book containing the inventive multilayer structure, where the multilayer structure is applied to at least one of the pages of the identification document.

In particular cases, the multilayer structure can be applied to the pages on both sides of the sheet of the identification document.

A multi-layer structure can be applied to the flyleaf of an identification document

It is known that the average peak height of the paper relief can reach 15 μm, which is at least 30-60 times greater than the relief usually used for embossing protective diffractive elements.

In our case, the average relief value ranged from 0.2 to 0.3 µm. The noise of the optical reflected signal from the substrate arises both due to the inherent roughness of the paper, and due to the processes of deformation and relaxation stretching / shrinkage of both the base film and the adhesive layer, which becomes especially noticeable with sudden changes in external factors, such as humidity and temperature.

To reduce the influence of these factors, the structure of the lamination material has been developed, one of the main differences of which is the total thickness, which is different from both classical hot stamping foil with diffractive protective elements and traditional lamination materials made using base films.

One of the advantages of the proposed solution is the preservation of the impossibility of tearing off the lamination layer from the substrate without destruction, similar to the property of self-destruction upon tearing, of classical foil.

At the same time, unlike laminates having a carrier film with a thickness of 21 to 200 microns and printing foils having an average thickness of 1.5 microns, this solution retains the advantages of foil as a destructible security element in the event of a transfer attempt, while retaining the property of laminates that provide increase in rigidity and resistance to external influences due to the use of increased thicknesses of varnish and adhesive layers.

To achieve the technical result, two additional functional layers are applied. The first is an adhesive layer with a thickness of 0.2 to 12 microns, depending on the type of substrate (paper, plastic, synthetic paper), which is also a damping layer during pressing and ensures complete filling of depressions on the base surface to eliminate distortion due to additional boundaries. phase separation that occurs in cases of conventional bonding. The second is a layer carrying a diffractive structure, having a thickness of 0.1 to 10 microns, and being a power layer that increases the transverse rigidity of the finished product with the applied laminate up to three times, compared with the material using foil.

The essence of the claimed invention is explained in the examples below.

As examples, we give some average layer thicknesses and some parameters of diffraction gratings for use when laminating the personal data page of a passport book made of paper or polycarbonate.

Example 1

The page with personal data of the passport book is made of paper.

Laminate is a multilayer polymeric material bonded to release paper, consisting of lacquer layers, embossed with a separating layer with a holographic image, on the inside of which protective elements and glue are applied:

1. Paper, siliconized one-sided - 70 microns;

2. Glue with residual stickiness thermally activated - 1 micron;

3. Base film, polyester, thickness - 19 microns;

4. Separating layer - 3 microns;

5. Relief receiving layer - 1.5 μm;

;6. Demetallized aluminum layer - 2000

;

;7. Reflective layer of zinc sulfide - 1000

;

8. Protective primer layer - 2 microns;

9. Luminescent paints UV excitation - 1 micron;

10. Adhesive layer - thermally activated adhesive for lamination on paper - 0.8 microns.

The holographic image is made in relief in the range of 0.3 - 0.6 microns and contains:

- High resolution lines;

- Diffraction bas-relief;

- Lens with the effect of changing characters;

- Nano and micro texts.

As additional protective elements on the side of the lacquer layers under the adhesive, images and inscriptions printed with sublimation and photochromic inks are applied. Also, the lamination page contains aluminum metallization with stochastic raster demetallization.

The laminate is connected to the release paper (rolled) along the upper long edge of the sheet with a rolling width of (10 ± 0.5) mm and along the lower edge with a rolling width of (2 ± 0.5) mm.

The laminating page and interleaving paper are perforated on the top along the long side at a distance of (8±0.5) mm from the edge of the laminate. Before hot rolling to the document page, first, release paper is removed, and after rolling, the base film of the hot stamping foil is removed using a special strip.

The adhesive coating acquires adhesive properties under the influence of temperature (130±10)°C and the pressure of the laminator rollers.

Example 2

The page with personal data of the passport book is made of polycarbonate

Laminate is a multilayer polymeric material bonded to interleaving paper consisting of lacquer layers, embossed with a separating layer with a holographic image, on the inside of which protective elements and glue are applied:

1. Paper, siliconized one-sided - 70 microns;

2. Glue with residual stickiness thermally activated - 1 micron;

3. Base film, polyester, thickness - 19 microns;

4. Separating layer - 1.5 microns;

5. Relief-receiving layer - 3.5 μm;

;6. Demetallized copper layer - 2000

;

;7. Reflective layer ITO - 1000

;

8. Protective primer layer - 2 microns;

9. Luminescent paints UV excitation - 1 micron;

10. Adhesive layer - thermally activated adhesive for lamination on polycarbonate - 1.2 microns.

The holographic image is made in relief in the range (0.6 - 0.8) µm and contains:

- high resolution lines;

- diffraction bas-relief;

- a lens with the effect of changing characters;

- nano and microtexts;

- hidden visualized labels.

As additional protective elements on the side of the lacquer layers under the adhesive, images and inscriptions printed with sublimation and photochromic inks are applied. The lamination page also contains ITO plating with demetallization to increase adhesion.

The laminate is connected to the release paper (rolled) along the upper long edge of the sheet with a rolling width of (10 ± 0.5) mm and along the lower edge with a rolling width of (2 ± 0.5) mm.

The laminating page and interleaving paper are perforated on the top along the long side at a distance of (8±0.5) mm from the edge of the laminate. Before hot rolling to the document page, first, release paper is removed, and after rolling, the base film of the hot stamping foil is removed using a special strip.

The adhesive coating acquires adhesive properties under the influence of temperature (150±10)°C and pressure of a semi-rotary metal press.

Example 3

The page with personal data of the passport book, made of synthetic or semi-synthetic paper, is laminated on both sides.

Laminate for the front side is a multilayer polymeric material combined with release paper, consisting of lacquer layers, embossed with a separating layer with a holographic image, on the inside of which protective elements and glue are applied:

1. Paper, siliconized one-sided - 70 microns;

2. Adhesive with residual stickiness thermally activated - 1 micron;

3. Film - base, polyester, thickness - 19 microns;

4. Separating layer - 1.5 microns;

5. Relief receiving layer - 3.5 microns;

;6. Demetallized copper layer - 2000

;

;7. Reflective layer ITO - 1000

;

8. Protective layer - primer - 2 microns;

9. Luminescent paints UV excitation - 1 micron;

10. Adhesive layer - heat-activated adhesive for lamination on polycarbonate - 1.2 microns.

The holographic image is made in relief in the range (0.6 - 0.8) µm and contains:

- high resolution lines;

- diffraction bas-relief;

- a lens with the effect of changing characters;

- nano and microtexts;

- hidden visualized labels.

Laminate for the reverse side is a multilayer polymeric material consisting of lacquer layers, embossing with a relief-receiving layer with a holographic image, on the inside of which protective elements and glue are applied:

1. Base film, polyester, thickness - 50 microns;

2. Relief receiving layer - 2 microns;

;3. Reflective layer of zinc sulfide - 1000

;

4. Primer layer - 1.5 microns;

5. Luminescent paints UV excitation - 0.8 μm;

6. Lamination adhesive layer - 75 microns.

Both laminations are sewn into the passport book on both sides of the page with personal data. For the front laminate, before laminating, actions similar to examples 1 and 2 are performed. Back laminate does not require special preparation procedures.

Example 4

Lamination of the page with personal data of the passport book if it is located on the flyleaf.

Laminate is a multilayer polymeric material bonded to release paper, consisting of lacquer layers, embossed with a separating layer with a holographic image, on the inside of which protective elements and glue are applied:

1. One-sided siliconized paper - 70 microns;

2. Adhesive with residual stickiness thermally activated - 1 micron;

3. Base film, polyester, thickness - 19 microns;

4. Separating layer - 3 microns;

5. Relief-receiving layer - 1.5 μm;

;6. Demetallized aluminum layer - 2000

;

;7. Reflective layer of zinc sulfide - 1000

;

8. Protective primer layer - 2 microns;

9. Luminescent paints UV excitation - 1 micron;

10. Adhesive layer - heat-activated adhesive for lamination on paper - 0.8 microns.

The holographic image is made in relief in the range (0.3 - 06) microns and contains:

- high resolution lines;

- diffraction bas-relief;

- a lens with the effect of changing characters;

- nano and micro texts.

As additional protective elements on the side of the lacquer layers under the adhesive, images and inscriptions printed with sublimation and photochromic inks are applied. Also, the lamination page contains aluminum metallization with stochastic raster demetallization.

It is possible to produce a passport book cover with a glued-in microchip due to the low temperature of rolling - (130 ± 10)°C and the pressure in the chip zone.

The proposed solution makes it possible to reduce the signal-to-noise ratio in the system, other things being equal, by at least two times. The parameters of diffraction gratings and thicknesses of lacquer layers are chosen, which lead to the minimum values of signal-noise in the system when restoring a virtual image. The averaged parameters of the combination of the angles of refraction and reflection in the complex are selected, which have the lowest average value of the signal-to-noise ratio under the same conditions.

The system includes an adhesive layer, which, in addition to the function of gluing, performs the function of a damper due to its increased thickness and the selected internal reflection coefficient.

At the same time, the optical properties of both the adhesive and the lacquer layers are selected so that the refractive index is not a multiple of the half-wavelength of the optical range, generally accepted for calculations as (555 nm).

Claims (7)

1. A multilayer structure for protecting identification documents, including a removable base film, on one of the sides of which are successively applied: a separating layer, a relief-receiving layer with a diffractive protective element, a demetallized layer of aluminum or copper or nickel with local opaque zones, a reflective layer of sulfide zinc or indium-tin oxide, a printing ink layer and an adhesive layer for fixing the structure on the protected document, while the thickness of the adhesive layer is from 0.2 to 12 microns, the thickness of the relief layer with a diffractive element is from 0.1 to 10 microns. 2. Multilayer structure according to claim 1, characterized in that the printing ink layer is an iridescent ink, and / or luminescent ink, and / or color-changing ink, and / or sublimation ink in any combination, applied both with a solid and in the form local elements. 3. Multilayer structure according to claim 1, characterized in that the base film is made with the possibility of removal during partial wear. 4. Multilayer structure according to claim 1, characterized in that the printing ink layer includes images that respond when excited by ultraviolet, infrared light, external magnetic field or thermal radiation. 5. Identification document in the form of a passport book containing a multilayer structure according to any one of paragraphs. 1-4, where the multilayer structure is applied to at least one of the pages of the identification document. 6. An identification document according to claim 5, characterized in that the multilayer structure is applied to the pages on both sides of the sheet of the identification document. 7. An identification document according to claim 5, characterized in that the multilayer structure is applied to the flyleaf of the identification document.