The invention relates to the field of protective technologies for identification documents such as passports, identification cards, and drivers licenses. In order to protect such documents against counterfeiting, during the manufacture thereof, personalized information regarding the owner of the document is recorded therein. Typically, this information consists in a portrait of the document owner, biometric data, date and place of birth, and time and place of document issuance. Proposed is a method for producing a combined black-and-white and full-color personalized image which identifies the authenticity of the information carrier, recorded in the form of a pixel array having a raster structure. An image is formed by means of masking or removing material in certain areas of the information carrier using various laser etching methods. According to the invention, the pixels are divided into sub-pixel areas which are responsible for the color of the observed image. An image is formed by partially changing the color saturation and brightness of the sub-pixel areas by means of modulating the intensity, duration and quantity of laser pulses, by precisely positioning a laser beam in accordance with the elements of the pixel array and special optical markers. The technical result consists in creating pixel arrays allowing for forming combined black-and-white and color images using modes of personalization based on laser etching technology in a single diffraction layer.
The invention relates to the field of protecting products against counterfeiting and is intended for using an instrument for determining the authenticity of printed products to be protected, such as banknotes and securities forms, labels, excise stamps and postage stamps, payment and identification documents, and also passports and travel documents. The aim and technical solution of the proposed invention consist in creating a product containing a carrier with hidden security markings applied to the surface thereof, wherein the markings are carried out using a luminescent inorganic compound having a crystalline structure based on rare earth elements, characterized in being capable of Stokes or Anti-Stokes luminescence outside of the visible range of the optical spectrum, carried out under the influence of an excitation radiation which is within a first spectral range, and under a second influence on said luminescence by a stimulating radiation which is within a second spectral range, and characterized in that the intensity of the luminescence can change without changing the spectral composition thereof. The proposed technical solutions and methods for controlling authenticity provide for a high level of counterfeiting protection for a valuable document.
B42D 25/21 - Cartes ou structures de type feuille portant des informations caractérisées par leurs éléments d’identification ou de sécuritéLeur fabrication caractérisées par une utilisation ou une finalité particulières pour finalités multiples
G06K 19/14 - Supports d'enregistrement pour utilisation avec des machines et avec au moins une partie prévue pour supporter des marques numériques caractérisés par le genre de marque numérique, p. ex. forme, nature, code utilisant des marquages de différentes sortes sur le même support d'enregistrement, p. ex. un marquage étant lu optiquement et l'autre par des moyens magnétiques au moins une sorte de marquage étant utilisée pour l'authentification, p. ex. de cartes de crédit ou de cartes d'identité le marquage étant lu par irradiation
3.
MULTILAYERED PROTECTED COMPOSITION (VARIANTS) AND ARTICLE CONSISTING OF SAID COMPOSITION
The invention relates to a multilayered protected composition, in particular to multilayered paper articles with special properties which protect securities or documents from counterfeit. The multilayered protected composition is formed with an additional multilayered element, which is formed on the surface of the paper and comprises a multicolored coating in the form of a periodic raster formed by at least two inks of different colors which are contrasted relative to the surface of the paper and lie outside of the region of the color coverage of the CMYK system. The inks comprise luminescent compounds having daytime luminescence in the visible spectrum of light under the action of natural radiation. Combinations of inks are such that the cumulative color of an additional protective element is perceived visually as being unsaturated, and close to achromatic. The multilayered protective element can form a graphical figure or be part of a figure which changes the way in which it is visually displayed by virtue of changing its color gamut, optical density and/or saturation when a document is copied on a printer operating using the CMYK color system.
B42D 25/21 - Cartes ou structures de type feuille portant des informations caractérisées par leurs éléments d’identification ou de sécuritéLeur fabrication caractérisées par une utilisation ou une finalité particulières pour finalités multiples
The invention relates to the field of preparing materials intended for visually determining the authenticity of protected printed products such as all types of valuable documents. Set forth is a multi-layer material on a paper or polymer substrate, said material containing layers having optically-variable properties. Optically-variable layers which are indistinguishable to the naked eye and which have mutually opposite directions of circular polarization are in the form of two identical images of a single graphical element, said layers being shifted in the same plane by a given distance which allows for seeing a stereoscopic image of the graphical element when using eyeglasses having polarizing light filters having a mutually opposite direction of circular polarization. The technical result is an increased level of protection by means of a simple method for determining the authenticity of a product.
B42D 25/21 - Cartes ou structures de type feuille portant des informations caractérisées par leurs éléments d’identification ou de sécuritéLeur fabrication caractérisées par une utilisation ou une finalité particulières pour finalités multiples
The invention relates to the field of protecting against the counterfeiting of products made on a paper carrier or on a polymer carrier, and is intended for visually determining the authenticity of a protected printed product. A product, for instance, a valuable document, comprising a carrier and a multi-layer protective element containing a latent image. The protective element is indiscernible when the document is examined at a right angle to the surface thereof, but becomes visible when the angle of observation changes. The latent image is comprised of two identical graphical elements of different colors, which are formed by means of the mutual offset of portions of a three-dimensional raster and of a multi-colored raster cover by a distance which is a multiple of half of the period of the raster, and which are positioned in a single plane relative to one another. The elements are positioned at a distance which allows for the viewing of a stereoscopic image thereof by using anaglyph glasses and/or color light-filters. The technical result is an increased level of protection of a valuable document.
B42D 25/21 - Cartes ou structures de type feuille portant des informations caractérisées par leurs éléments d’identification ou de sécuritéLeur fabrication caractérisées par une utilisation ou une finalité particulières pour finalités multiples
The claimed group of inventions discloses a layered article on a paper or polymer base with an optically variable structure, and also a method for manufacturing same. The layered article comprises a coating in the form of a printed raster, and a three-dimensional raster. The three-dimensional raster is in the form of elements with a symmetrical and/or asymmetrical profile with a relief being formed on both sides of the base and being arranged in relation to the printed raster in such a manner that the three-dimensional raster is at least partially arranged above the printed raster. The width of the lines, the distance between the lines of the printed raster and the three-dimensional raster and the mutual orientation of the rasters are selected so as to form a Moiré image which is obscured when looking at the information carrier at a right angle, while said image becomes visible when looking at the information carrier at an acute angle. The proposed invention ensures an increase in the security of articles, and also an increase in the manufacturability and a reduction in the cost of the security element by reducing the number of passes in a printer.
B32B 33/00 - Produits stratifiés caractérisés par des propriétés particulières ou des caractéristiques de surface particulières, p. ex. par des revêtements de surface particuliersProduits stratifiés conçus pour des buts particuliers non couverts par une seule autre classe
The invention relates to technology for checking the authenticity of papers using optical security tags on banknote fibres. The method for checking a banknote which is invariant in relation to a shift and rotation thereof within 10 degrees comprises illuminating the security tag with a laser beam perpendicular to the plane of the banknote. Furthermore, an asymmetrical image is produced which is in the form of bright segments which are parallel to the direction of movement of the banknote in the path of a calculating and sorting device and which are arranged in the focal plane of the parallel plane of the banknote or in the planes Q1 and Q2, which are inclined with respect to the plane of the banknote through an angle а of less than 60 degrees. The line of intersection of said segments is parallel to the direction of movement of the banknote, and the check criterion used for the identification comprises the distances between each of the segments and the laser beam. The device for checking the authenticity of paper comprises a laser diode, a detection system comprising 2 or 4 lines of photodiodes, an electronic unit for recording information, and an electronic unit for the automated checking of authenticity. The invention makes it possible to increase the level of security of optical tags to prevent counterfeits and to increase the reliability of identification and the checking invariance.
The invention relates to paper technology, and to products which are protected against counterfeiting, such as identification documents, bank cards and tokens serving as substitutes for banknotes. The technical result is that of producing banknote substitutes based on laminated plastics containing protective elements and being highly resistant to attack and mechanical wear during use, and reducing the production cost thereof. The counterfeit-proof multi-layered product comprises paper sheets with protective elements, said sheets being impregnated with a polymer binder, and also outer polymer layers. The paper sheets are completely impregnated in a thermoset polymer melt or a thermoplastic polymer melt and the surfaces of each sheet are coated with a polymer layer. The method for producing a multi-layered product comprises impregnating paper sheets with protective elements using a thermoset polymer melt or a thermoplastic polymer melt or mixtures thereof, drying with partial polymerization, assembling a stack of impregnated sheets, hot-pressing and laminating the stack while simultaneously forming a surface relief and cutting out products of a specified geometric shape.
B32B 27/10 - Produits stratifiés composés essentiellement de résine synthétique comme seul composant ou composant principal d'une couche adjacente à une autre couche d'une substance spécifique de papier ou de carton
9.
COUNTERFEIT-PROTECTED DATA CARRIER AND METHOD FOR MANUFACTURING SAME
The invention relates to counterfeit-protected data carriers and methods for protecting printed products from counterfeit. The data carrier has a transparent portion with graphic elements disposed on both sides thereof in the form of a high resolution line screen, said graphic elements forming an array, wherein the mutual arrangement of the elements is such that they form an image which is hidden when viewed in reflected light and visible when viewed in transmitted light; furthermore, when viewed from a different direction in transmitted light, the image changes from positive to negative and vice versa, and/or the colour of the image changes completely or partially, and/or the effect of the movement of monochrome or multi-coloured moire fringes is produced. The method for manufacturing the data carrier involves applying graphic elements to both sides of a transparent portion of the carrier by printing. The data carrier retains its flatness after printing. The invention provides for the increased protection of items and the production of a novel optically variable effect and/or the effect of movement, as well as increasing the manufacturability and reducing the cost of the protective element.
B42D 25/20 - Cartes ou structures de type feuille portant des informations caractérisées par leurs éléments d’identification ou de sécuritéLeur fabrication caractérisées par une utilisation ou une finalité particulières
The technical result of the present invention is that of broadening the technological capabilities of a process for producing a watermark in paper while enhancing the potential of the watermark as a protective anti-counterfeiting element. The proposed method for manufacturing paper with a multitone watermark consists of using a relief mask for forming a paper web on a paper machine, said relief mask being a partially permeable forming element. The mask has a variable height across the area of the watermark image, produced by the relief stamping of a mesh or of electrotypes and/or the combined stamping of the mesh and the electrotypes, and/or by the use of a plurality of electrotype layers. The mask is assembled from a plurality of layers of perforated metal plates or of polymer plates or of composite materials, resin (adhesives) filling being used in the formation of the mask, or the mask is combined of a plurality of layers of perforated plates of metal, polymers, and composite materials.
The invention relates to the field of the protection of securities from counterfeit and is intended for determining, using equipment, the authenticity of printed articles being protected such as all types of securities. A security has a marking which comprises at least one inorganic compound with a crystalline structure, which inorganic compound is alloyed with ions of rare earth elements and has the property of selective reaction with radiation in the optical spectral range, wherein in the event that said inorganic compound is exposed to radiation in a set band of the optical spectrum, the radiation of the compound only in this band of the spectrum has an excess above thermal radiation with a finite length of 10-10 seconds or more. The proposed invention makes it possible to increase the degree of protection of a security.
The invention relates to compositions of inorganic luminophores suitable for protecting valuable material objects against counterfeit. The composition for marking metal items produced by powder metallurgy comprises a luminophore and a binding-lubricating agent in the form of fatty acid derivatives or synthetic wax powder and/or paraffin powder. The method for marking metal items consists in mixing a metal alloy powder with the marking composition and subsequently compression moulding the resultant mixture and carrying out sintering. The invention enables the even distribution of a marking component in a metal powder as well as the effective marking of items during the manufacture thereof by powder metallurgy and provides a simple and safe marking technique.
The valuable document comprises a coating in the form of a printed raster that is made up of at least one colour which is different from the colour of the main document. The document also comprises a three-dimensional raster arranged relative to the coating so that the three-dimensional raster is at least partially disposed on the coating, is oriented substantially parallel to the lines of the printed raster and together with the coating forms a latent image which is not discernible when the document is viewed at a right angle. At least a portion of the lines of the three-dimensional raster has an asymmetric cross-section profile with an aspect ratio of not less than 1:1.25, as a result of which the latent image becomes visible in the form of coloured elements or a single-coloured region in the event of a change in the viewing angle. In the event of a 180° change in the viewing direction without any change in the viewing angle, a change in the optical density or in the colour gamut of at least a part of the latent image results. The invention makes it possible to increase the protection against counterfeiting of a valuable document with optically variable images and makes it possible for an untrained user to carry out a visual authenticity check.
The decorative modification method comprises manufacturing a metal blank, treating the surface thereof by cleaning and polishing, subjecting the front and/or reverse surfaces to cold plastic deformation by embossing a three-dimensional matt decorative element and, adjacent thereto, a flat specular decorative element on said surfaces, with said decorative elements contrasting in terms of class of roughness and tonality. The embossing of the decorative elements is conducted on a locally arranged section or sections of the surface. At the same time as the embossing of the decorative elements, a projection or projections are embossed over the outer contour of the local sections. A mosaic decorative element is mounted on the side of the lateral edge of the projection opposite that edge of the projection which adjoins the local sections of the decorative element, which is formed by plastic deformation, on the surface or on the locally arranged sections of the surface of the blank. Prior to the mosaic decorative element being mounted, the sections of the surface with the three-dimensional and flat decorative elements which are contrasting in terms of class of roughness and tonality are masked.
The invention relates to counterfeit-proof printed products and concerns a multi-layered polymeric security element having an optically variable effect. The security element is in the form of a structure in which at least one layer contains a three-dimensional micro-raster structure and a second layer contains a printed raster of micro-images that are arranged in units of the printed raster. The spatial period of the printed raster is determined by the spatial period of the three-dimensional micro-raster structure. The elements of the three-dimensional micro-raster structure are in the form of reflecting focusing elements which constitute micro-mirrors and are disposed inside an element in the units of the three-dimensional raster. The reflecting focusing elements can be embossed micro-bumps on a varnished layer or phase Fresnel zone plates to which a thin reflecting or semi-transparent reflecting layer of metal is applied.
B42D 15/10 - Cartes d'identité, cartes de crédit, cartes bancaires ou cartes analogues portant des informations (supports d'enregistrement, p.ex. cartes d'identité ou cartes de crédit, pour utilisation avec des machines et avec au moins une partie prévue pour supporter des marques numériques G06K 19/00)
G02B 1/04 - Éléments optiques caractérisés par la substance dont ils sont faitsRevêtements optiques pour éléments optiques faits de substances organiques, p. ex. plastiques
The invention relates to the jewellery and haberdashery industry. The pendant comprises a decorative element 1, a carrier body 2 having a positioning depression 4 beneath the decorative element, and a unit for locking said decorative element and the carrier body with respect to one another. The carrier body has an annular groove 5 which is oriented towards the front face of said carrier body and adjoins the positioning depression, wherein the parameters for the contour of the lateral surface of said annular groove exceed the parameters for the contour of the corresponding surface of the positioning depression 4. The locking unit is in the form of an annular plate 6. The plate 6 has edge supporting portions on the rear side, said supporting portions interacting with corresponding portions of the front face surface of the body 2, and an elastic locking device in the form of an annular element 7 with a peripheral rib 8, which interacts with the end and lateral surfaces of the annular groove 5 in the body. This makes it possible to increase the locking reliability and to replace one decorative element with another irrespective of the structural design of the decorative element.
The invention relates to information carriers with an optically variable structure. The information carrier comprises a coating which is in the form of a printed raster, and a three-dimensional raster. The three-dimensional raster is at least partially arranged on the coating. The width of the lines and distance between the lines of the printed and three-dimensional rasters and the mutual orientation of the rasters are selected so as to form a moiré image, and when the carrier is viewed at a direct angle to the surface, the coating is fully discernible while the moiré image is hidden. When the carrier is viewed at an acute angle, that part of the coating which is located on the surfaces of the three-dimensional raster, which surfaces are arranged parallel to the direction of observation or are shielded from the observer by elements of the three-dimensional raster, is not discernible. In this case, that part of the coating which is located on the surfaces of the three-dimensional raster, which surfaces face the observer and are not shielded from the observer by elements of the three-dimensional raster, is discernible, and, as a result thereof, the moiré image becomes visible. The two-colour border of the printed raster is primarily arranged on inclined sections of the three-dimensional raster. When the angle of inclination of the carrier is changed, the effect of movement of the borders of the coloured strips on the carrier is observed.
The invention relates to information carriers protected from counterfeit. The information carrier comprises a section which is printed by a metallographic method and consists of relief lines forming an image. The section is formed from relief lines which are coloured along the entire length and which alternate with relief lines which have coloured or uncoloured sections, and/or with uncoloured relief lines, or from coloured relief lines of a minimum of two gradations in depth. The method for manufacturing the information carrier comprises imprinting the section using a metallographic printing mould having printing elements - in the form of recessed lines arranged along the generatrix of a shaped cylinder and/or at an angle to the generatrix. The lines of the printing mould have a minimum of two gradations in depth, and paint is fed to the mould in a volume necessary for the filling with paint only of lines and/or sections of lines of reduced depth while keeping the lines of greater depth uncoloured, or in a volume sufficient for painting the lines of all depths.
The invention relates to the production of multilayered metal articles which are formed from different materials and are protected against counterfeit, such as, for example, composite small or collector coins, metal tokens or medals, and, in particular, to the production of composite coins, tokens or medals consisting of several parts, generally a disc and a ring formed from different materials. The invention provides a multilayered metal composite article with a circular central part and an annular part surrounding said circular central part, in which the central and annular parts are formed from different metals, wherein the annular part is formed from at least one valve metal selected from the group consisting of: aluminium, titanium, tantalum, niobium, with an upper surface layer which is subjected to electrochemical processing.
The invention relates to special purpose printed materials. The identification document comprises a cover made from bookbinding material, paper sheets and a multi-layered information page. The owner's personal details and a machine-readable line are applied to one of the sides of the information page by a laser etching method. A laser perforation of an individual number is made on the paper sheets of the document and on the cover. A multi-layer protective element, comprising a polymeric metallized film with high reflective capability and on which variable identification information is applied, is introduced onto the sealed surface of at least one internal layer of the identification page, under an external transparent polymer layer, and a transparent foil with holographic images is applied to the external surface of the information page on at least one side thereof.
G07D 7/12 - Lumière visible, rayonnement infrarouge ou ultraviolet
B42D 15/10 - Cartes d'identité, cartes de crédit, cartes bancaires ou cartes analogues portant des informations (supports d'enregistrement, p.ex. cartes d'identité ou cartes de crédit, pour utilisation avec des machines et avec au moins une partie prévue pour supporter des marques numériques G06K 19/00)
B32B 38/00 - Opérations auxiliaires liées aux procédés de stratification
21.
METHOD FOR MANUFACTURING A STAMP FOR MARKING ARTICLES MANUFACTURED FROM METALS WHICH ARE PLASTIC UPON COLD DEFORMATION
The invention relates to metal-working and can be used for manufacturing stamps for the mechanical application of letters and symbols onto the surface of articles. The method comprises the mechanical application onto a stamp blank surface of three-dimensional marking symbol reliefs, the recesses and projections of which are negative in the metal layer of the blank in relation to the original of the symbol reliefs of the stamping on the surface of the article being marked. In order to apply a symbol image onto the surface of a stamp blank, use is made of a counter punch with symbols applied to the surface thereof by means of a punch. The symbol images in the metal layer of the punch blank and on the stamp are analogous and are produced by a machining etching method with the use of software for the coordinated copying of the stamping original. For the manufacturing of the stamp, punch and counter punch, use is made of blanks made from tool metals which are plastic upon cold deformation and which, after three-dimensional relief images are formed thereon, are hardened to the hardness of tool metal which ensures cold plastic deformation of the metals of each subsequent metal blank and article subjected to the stamping. The invention makes it possible to increase the productivity, to simplify the process of manufacturing stamps with the mechanical formation of marking symbols on the stamp blanks while simultaneously maintaining the reproduction quality of said symbols.
B23P 15/28 - Fabrication d'objets déterminés par des opérations non couvertes par une seule autre sous-classe ou un groupe de la présente sous-classe d'outils de coupe
B44C 1/22 - Enlèvement superficiel de matière, p. ex. par gravure, par eaux fortes
22.
MULTILAYERED SECURITY ELEMENT WITH VARIABLE OPTICAL EFFECT AND A COUNTERFEIT-PROOF DOCUMENT
The invention relates to counterfeit-proof documents with multilayered security markings. The multilayered security element comprises a flexible base layer with optically variable structures containing two or more groups of recurring images which shift and/or change as the viewing angle changes. The optically variable structures are formed in such a way that when the viewing angle changes, different groups of images move relative to each other. The invention makes it possible to enhance the security of items by means of a novel optical effect which renders the secure object more readily identifiable and is based on the observation of the reciprocal movement of images when the viewing angle changes.
The invention relates to a multilayered paper for the production of valuable documents which contains reinforcing strips in certain places along the length and/or width of the paper web and is characterized in that the reinforcing strips are produced by the formation of an additional fibrous layer on the surface of the paper, wherein the specific weight of the paper in the places where the additional fibrous layer is formed is greater than the specific weight of the main field of the paper. The additional fibrous layer on the surface of the paper can be formed as a result of additional grooves on the surface of the mesh of a mesh cylinder. The invention offers a simpler and more reliable solution to the problem of bent corners and mechanical damage to the edges of banknotes and other documents and also of reinforcing the entire structure of the paper.
The invention relates to composite carbon-containing nanomaterials for the manufacture of mint items such as coins, tokens and medals from metal powders. The composite carbon-containing material for mint items contains copper, nickel, tin, iron and fulleroid-type carbon nanostructures in the following component ratio (wt%): 1.0 – 2.0 nickel; 9.0 – 12.0 tin; 2.0 – 4.0 iron; 0.1 - 0.2 fulleroid-type carbon nanostructures; and the remainder copper. The invention makes it possible to develop a material which exhibits an optimal combination of mechanical properties, has security features and is also more economical.
The invention relates to the manufacture of paper with watermarks for use in the production of banknotes and value documents that require enhanced protection against forgery. The counterfeit-proof paper contains watermarks with a multi-tone effect, comprising pale and dark elements perceived as a raster image when viewed by transmitted light, wherein the pale elements are characterized by a lower weight per surface unit of the paper than the dark elements. The total surface area of the pale elements of the watermark having an optical density less than that of the paper represents at least 1% of the overall surface area of the paper, and the depth of the pale elements of the watermark does not exceed 70% of the depth of the paper. The mesh for manufacturing the paper comprises masks for forming the watermark, which are in the form of solid members arranged between the perforated sections of the mesh. At least one mask is provided with micro-openings having a diameter not exceeding 0.25 mm, wherein the total surface area of the micro-openings does not exceed 15% of the overall surface area of a mask. The invention increases the strength of the paper while maintaining good tone rendering of the image.
A counterfeit-proof value document with a mark containing a composition that is made up of fluorescent compounds, including at least one inorganic photostimulated fluorescent compound that is excited by UV or visible spectrum radiation and that exhibits fluorescence in the visible spectrum when exposed to infrared radiation. An inorganic, anti-Stokes fluorescent compound that exhibits fluorescence in the visible spectrum when exposed to infrared radiation provides for the production, under consecutive or simultaneous irradiation, of a visually detectable dynamic effect in the form of a colour change, a flickering, a scattering of waves of brightness or the pulsation of an image on the security mark. An authenticity verification method involves the consecutive irradiation of a value document, and the visual detection of a dynamic effect. An authenticity verification device comprises sources of photoexciting and photostimulating radiation, a diaphragm for the formation of a pattern of the aforesaid radiation and a control unit. Furthermore, the optical axes of the two sources of radiation cross in the plane in which the value document security mark is situated.
B42D 15/10 - Cartes d'identité, cartes de crédit, cartes bancaires ou cartes analogues portant des informations (supports d'enregistrement, p.ex. cartes d'identité ou cartes de crédit, pour utilisation avec des machines et avec au moins une partie prévue pour supporter des marques numériques G06K 19/00)
G07D 7/12 - Lumière visible, rayonnement infrarouge ou ultraviolet
C09K 11/00 - Substances luminescentes, p. ex. électroluminescentes, chimiluminescentes
27.
METHOD FOR PRODUCING SAFETY (VARIANTS) AND SAID SAFETY PAPER (VARIANTS)
The invention relates to methods for producing safety paper which is used for producing fraud-proof printing products. In the first variant, the inventive method for producing safety paper consists in forming a paper web with a protective strip of 2 mm in width which is incorporated into said web during the formation thereof on a wire cylinder mould, wherein the protective strip is incorporated into a pulp in such a way that, prior to a contact thereof with the cylinder, a fiber layer is formed, except for the areas on the cylinder surface, where the layer is not formed for lack of filtering capacity. The protective strip is positioned on the cylinder in such a way that a part of the surface thereof is merged with the cylinder elements and free access areas in the form of widows are formed on a paper wire side. The areas devoid of filtering property are formed on the cylinder surface by covering the wire with a filigree paper or by moulding a waterproof material thereon or by perforating through holes in the wire. On the side opposite to the wire side, the protective strip is totally or in part opened and, where the windows coincide on the wire side and the protective strip totally or in part exits, through windows are formed on the opposite side of the paper. In the second, third and fourth variants, the inventive method for producing safety paper consists in forming a paper web with a protective strip with a width larger than 2 mm in such a way that the protective strip exits on the two sides of the paper web and a through window effect is obtained.
D21F 11/00 - Procédés de fabrication de longueurs continues de papier ou de carton, ou de nappe humide pour la production de panneaux de fibres, sur des machines à papier
B42D 15/00 - Cartes ou imprimés d'un format ou d'un type particulier non prévu ailleurs
brevets