EP4547908A1 - Method for the production of paper protected against forgery, such paper and printing products - Google Patents

Method for the production of paper protected against forgery, such paper and printing products

Info

Publication number
EP4547908A1
EP4547908A1 EP23758711.8A EP23758711A EP4547908A1 EP 4547908 A1 EP4547908 A1 EP 4547908A1 EP 23758711 A EP23758711 A EP 23758711A EP 4547908 A1 EP4547908 A1 EP 4547908A1
Authority
EP
European Patent Office
Prior art keywords
paper
additive
color
protected against
production
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23758711.8A
Other languages
German (de)
French (fr)
Inventor
István László SZÖKE
Bálint CSÍK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dipa Diosgyori Papirgyar Zrt
Original Assignee
Dipa Diosgyori Papirgyar Zrt
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dipa Diosgyori Papirgyar Zrt filed Critical Dipa Diosgyori Papirgyar Zrt
Publication of EP4547908A1 publication Critical patent/EP4547908A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B42D25/382—Special inks absorbing or reflecting infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent materials, e.g. electroluminescent or chemiluminescent
    • C09K11/08—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials
    • C09K11/0855—Phosphates
    • C09K11/0872—Phosphates with rare earth metals
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48—Elements suited for physical verification, e.g. by irradiation
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation

Definitions

  • the invention relates to a method for the production of paper protected against forgery provided with an additive containing rare earth metals, and a paper produced by the method according to the invention.
  • Patent EP 19970811029 describes a solution in which the paper and printing industry product protected against forgery contains at least one kind of inorganic particles containing at least two chemical elements in a fixed ratio.
  • the fixed ratio of chemical elements is a code or part of a code as a characteristic of the designation.
  • the codes are read back using SEMZEDX X-ray electron-analysis, which is a serious laboratory test - using an electron microscope.
  • Publication document W02010037456 Al discloses an infrared absorber built into the product as a safety element (wavelength 800-2500 nm) - added to printing ink.
  • Publication document W02020239740 Al describes inks suitable for printing machine-readable security features on a substrate.
  • the Czech patent No. CZ17343U1 shows a real progress, the essence of which is that during the production of the paper carrier a safety material based on anti-Stokes compounds is mixed into its raw material, and the emission (afterglow) is checked with naked eye, which afterglow can be white, red, green and orange.
  • paper with a security feature has the advantage that its authenticity can be verified and identified even if the paper is destroyed, for example burnt.
  • paper with a safety element is made by adding a safety material radiating in the anti-Stokes range to the raw material during paper production, which is dispersed in the paper pulp.
  • Our goal with the invention is to eliminate the disadvantages of the described solutions and to apply a multi-component paper identification system with an advanced physical, optical-nanotechnological and IT analysis method that enables the application of a large number of codes related to the given paper production batch, and the applied code can be read back instrumentally.
  • At least three pigments containing rare earth metals excited in the visible and invisible wavelength range preferably in the visible wavelength range of 400- 750 nm and in the IR range of 750-1400 nm, producing anti-Stokes scattering, absorbing in the near-infrared and emitting light in the visible range, such as a mixture of gadolinium oxy sulfide-doped yttrium oxysulfide, yttrium oxide-doped lanthanum oxide, yttrium oxysulfide- doped thulium oxide in a predetermined ratio according to RGB or CMYK color model or in an arbitrarily determined ratio, for example, a mixture of 125, 125, 125, i.e. in 1 : 1 : 1 ratio further mixed with a starch-based carrier material, e.g. C18H39CIN4O6 material.
  • a starch-based carrier material e.g. C18H39CIN4O6 material.
  • Our object is achieved by developing a method for the production of paper protected against forgery, containing the step of
  • yttrium oxysulfide doped with gadolinium oxysulfide lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide are used.
  • the pre-fixed ratio used during the mixing of the three pigment components premixed with the carrier is selected from RGB color model.
  • the wavelength and intensity of the radiation are recorded as physical parameters of the detected radiation.
  • Our object can be achieved also by a paper protected against forgery, having an additive containing rare earth metal, and a color-coded additive is evenly distributed in the paper in the amount of 0.05% to 1.5% by weight of the paper, which additive contains at least three different pigments with a grain size of 2-10 microns, each containing rare earth metals and a starch-based carrier material in a quantity at least equal to the amount of the pigment.
  • the three different pigments containing rare earth metals are yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide.
  • At least three pigments containing rare earth metals for example granular Gd2Y2O4S2 yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide are prepared by sieving and/or grinding according to a 2-10 micron particle size range most suitable for paper production. In one preferred embodiment of the invention, 20/15/10/5/2 micron sized sieve inserts were used. The duration of sieving and the setting of the frequency of the vibration of the sieve are determined by the quality and agglomeration of the pigments.
  • the pigment component thus prepared having a grain size of 2-10 microns is premixed with a starch-based carrier having a formula C18H39CIN4O6 in a ratio of 1 : 1.
  • the pre- mixing of the prepared pigments with the starch-based carrier was conducted with a rotary mixer.
  • the color-coded additive is homogenized, by adding an additional quantity of starch- based carrier material, if necessary, to adjust its density suitable to the paper production technology, e.g. to a density of 0.8-1.5 g / ml, which is conducted with a cross-beater mill.
  • the additive is exposed to the effect of an exciting radiation source e.g. by using FLAME-S-XR1-E type instrument known and commercially available and produced by the OceanOptics Flame Spectrometer, where the wavelength of the exciting radiation is chosen between 400-1400 nm.
  • the instrument contains a logic circuit, the software installed on it and a memory device, a radiation emitting unit, a data processing unit for evaluation, as well as a LED display for visual display and, where appropriate, a unit for emitting a sound signal.
  • the device can advantageously contain a signal amplifier and various signal filtering units.
  • the wavelength and intensity of the emitted radiation detected by the optical sensor unit of the instrument depends on the ratio of the three pigments mixed in the additive. This relationship, as the code of the additive containing the mixture in the given ratio, is stored for repeatability of subsequent production of the additive material.
  • the additive contains at least three compounds containing rare earth metals, the volume homogeneity index of the carrier material and the three different pigments must reach at least HImin: 98.53 %/ml 3 according to our tests, in order to the same color code to be measured everywhere on the surface of the finished product.
  • the required level of homogeneity can be achieved by adding the carrier material, and therefore it is guaranteed that the pigments containing rare earth metals contained in the safety additive added to the paper pulp during paper production are present in the same distribution as the ratio of color mixing at any point of the paper structure.
  • the Hlf value for surface homogeneity of the paper is at least 98%/mm 2 .
  • the paper protected against forgery according to the invention therefore, has a color-coded additive uniformly distributed in an amount of 0.05 v% to 1.5 v%, which contains at least three different rare-earth-metal containing pigments with a grain size of 2- 10 microns in a pre-fixed ratio, as well as a starch-based carrier material in an amount at least equal to the amount of the pigment.
  • the three rare earth metal pigments are preferably yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide.
  • a printing product protected against forgery can be made from the paper according to the invention produced by the process according to the invention.
  • Paper manufactured by the use of described additive, or a printing product containing such paper is exposed to the exciting radiation source e.g. by using the instrument mentioned above.
  • the wavelength and intensity of the radiation emitted by the additive in the paper and detected by the optical sensor of the instrument's detector definitely depends on the ratio of the three pigments mixed in the additive.
  • Paper production can be conducted by using any of the known technologies, using the homogenized additive described in the description as an additive.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)

Abstract

The invention discloses a process for the production of paper protected against forgery, during which a pigment component is prepared from a granular pigment base material containing rare earth metals, the prepared pigment component is premixed with a starch-based carrier material, and then at least three pigment components are mixed with a carrier in a predetermined ratio to create a color-coded additive. The color-coded additive is mixed with paper pulp, paper is made from the pulp, the finished paper product is illuminated with a radiation source in the wavelength range of 400-1400 nm, the radiation emitted by the additive is detected instrumentally, the physical parameters of the detected radiation are recorded electronically, and the recorded physical parameters are assigned to the color code. The invention also includes paper with anti-forgery protection, as well as a printing product.

Description

Method for the production of paper protected against forgery, such paper and printing products
The invention relates to a method for the production of paper protected against forgery provided with an additive containing rare earth metals, and a paper produced by the method according to the invention.
The protection of the originality of paper carriers is achieved by placing flake fibers or watermarks or other elements visible to the naked eye, or combinations of these on the paper carrier. Paper carriers sometimes contain UV components that become visible when exposed to UV light. However, not all known security features provide adequate protection against counterfeiting, as counterfeiters are aware of these security features and can therefore incorporate or deceptively imitate them in counterfeiting items.
Patent EP 19970811029 describes a solution in which the paper and printing industry product protected against forgery contains at least one kind of inorganic particles containing at least two chemical elements in a fixed ratio. The fixed ratio of chemical elements is a code or part of a code as a characteristic of the designation. The codes are read back using SEMZEDX X-ray electron-analysis, which is a serious laboratory test - using an electron microscope.
Publication document W02010037456 Al discloses an infrared absorber built into the product as a safety element (wavelength 800-2500 nm) - added to printing ink.
Publication document W02020239740 Al describes inks suitable for printing machine-readable security features on a substrate.
The Czech patent No. CZ17343U1 shows a real progress, the essence of which is that during the production of the paper carrier a safety material based on anti-Stokes compounds is mixed into its raw material, and the emission (afterglow) is checked with naked eye, which afterglow can be white, red, green and orange. Thus, paper with a security feature has the advantage that its authenticity can be verified and identified even if the paper is destroyed, for example burnt. As described in the document CZ17343U1, paper with a safety element is made by adding a safety material radiating in the anti-Stokes range to the raw material during paper production, which is dispersed in the paper pulp. After illuminating the paper with 960- 980 nm wavelength infrared laser diode as a light source, one of the colors mentioned above appears at any point on the paper and can be detected with naked eye. This solution enables a limited number of code generation, and due to the use of a single rare earth pigment, the homogeneity of the additive in the paper and its physical binding to the pulp are not relevant.
Our goal with the invention is to eliminate the disadvantages of the described solutions and to apply a multi-component paper identification system with an advanced physical, optical-nanotechnological and IT analysis method that enables the application of a large number of codes related to the given paper production batch, and the applied code can be read back instrumentally.
To achieve the goal set was made possible by perceiving that in order to increase the number of color codes, at least three pigments containing rare earth metals excited in the visible and invisible wavelength range, preferably in the visible wavelength range of 400- 750 nm and in the IR range of 750-1400 nm, producing anti-Stokes scattering, absorbing in the near-infrared and emitting light in the visible range, such as a mixture of gadolinium oxy sulfide-doped yttrium oxysulfide, yttrium oxide-doped lanthanum oxide, yttrium oxysulfide- doped thulium oxide in a predetermined ratio according to RGB or CMYK color model or in an arbitrarily determined ratio, for example, a mixture of 125, 125, 125, i.e. in 1 : 1 : 1 ratio further mixed with a starch-based carrier material, e.g. C18H39CIN4O6 material.
Our object is achieved by developing a method for the production of paper protected against forgery, containing the step of
- preparing a pigment component with a particle size of 2-10 microns from a granular pigment base containing rare earth metals,
- pre-mixing the pigment component thus prepared with a starch-based carrier material in a ratio of 1 : 1,
- mixing at least three pigment components pre-mixed with the carrier in a pre-fixed ratio, thereby creating a color-coded additive,
- adjusting the density of the color-coded additive to a density of 0.8-1.5 g/ml fit for paper production technology, by adding an additional starch-based carrier material, if necessary, and then homogenizing the additive, and
- mixing a color-coded additive in a proportion of 0.05 v% to 1.5 v% to paper pulp,
- making paper product of the paper pulp mixed with the additive,
- illuminating the finished paper product with a source of electromagnetic radiation in the wavelength range of 400-1400 nm,
- detecting instrumentally the radiation emitted by the additive,
- recording electronically the physical parameters of detected radiation, and - assigning recorded physical parameters to the color code of the additive.
As a granular pigment base containing rare earth metals granular Gd2Y2O4S2, yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide are used.
As a starch-based carrier material C18H39CIN4O6 is used.
The pre-fixed ratio used during the mixing of the three pigment components premixed with the carrier is selected from RGB color model.
Setting the density of the color-coded additive to 1.2 g/ml.
Mixing the color-coded additive with the paper pulp by a ratio of 0.4 v% of the pulp.
The wavelength and intensity of the radiation are recorded as physical parameters of the detected radiation.
Our object can be achieved also by a paper protected against forgery, having an additive containing rare earth metal, and a color-coded additive is evenly distributed in the paper in the amount of 0.05% to 1.5% by weight of the paper, which additive contains at least three different pigments with a grain size of 2-10 microns, each containing rare earth metals and a starch-based carrier material in a quantity at least equal to the amount of the pigment.
The three different pigments containing rare earth metals are yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide.
Our object is achieved also by a printed product containing paper produced by a method according to any one of claims 1-7. or a paper according to any one of the claims 8- 9.
The invention will be described in detail below.
At least three pigments containing rare earth metals, for example granular Gd2Y2O4S2 yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide are prepared by sieving and/or grinding according to a 2-10 micron particle size range most suitable for paper production. In one preferred embodiment of the invention, 20/15/10/5/2 micron sized sieve inserts were used. The duration of sieving and the setting of the frequency of the vibration of the sieve are determined by the quality and agglomeration of the pigments.
The pigment component thus prepared having a grain size of 2-10 microns is premixed with a starch-based carrier having a formula C18H39CIN4O6 in a ratio of 1 : 1. The pre- mixing of the prepared pigments with the starch-based carrier was conducted with a rotary mixer.
Then mixing the at least three premixed pigment components together according to an RGB color model code, e.g. in a ratio of 255, 100, 155, thus creating a so called color- coded additive. Mixing is done with PLC-controlled precision dosing equipment with at least milliliter accuracy.
The color-coded additive is homogenized, by adding an additional quantity of starch- based carrier material, if necessary, to adjust its density suitable to the paper production technology, e.g. to a density of 0.8-1.5 g / ml, which is conducted with a cross-beater mill.
Then the additive is exposed to the effect of an exciting radiation source e.g. by using FLAME-S-XR1-E type instrument known and commercially available and produced by the OceanOptics Flame Spectrometer, where the wavelength of the exciting radiation is chosen between 400-1400 nm. The instrument contains a logic circuit, the software installed on it and a memory device, a radiation emitting unit, a data processing unit for evaluation, as well as a LED display for visual display and, where appropriate, a unit for emitting a sound signal. The device can advantageously contain a signal amplifier and various signal filtering units. The wavelength and intensity of the emitted radiation detected by the optical sensor unit of the instrument depends on the ratio of the three pigments mixed in the additive. This relationship, as the code of the additive containing the mixture in the given ratio, is stored for repeatability of subsequent production of the additive material.
Then, by adding the described additive, a paper pulp is made and paper is produced from it. Since the additive contains at least three compounds containing rare earth metals, the volume homogeneity index of the carrier material and the three different pigments must reach at least HImin: 98.53 %/ml3 according to our tests, in order to the same color code to be measured everywhere on the surface of the finished product. The required level of homogeneity can be achieved by adding the carrier material, and therefore it is guaranteed that the pigments containing rare earth metals contained in the safety additive added to the paper pulp during paper production are present in the same distribution as the ratio of color mixing at any point of the paper structure. Applying HImin for the paper mass, the Hlf value for surface homogeneity of the paper is at least 98%/mm2. By arbitrarily changing the mixing ratio of three or more components, similar to the RGB or CMYK color model, millions of invisible but readable variations can be created in such a way that, due to the increased homogeneity, the sufficient amount of safety additive added to the paper pulp during paper production is 0.1 volume% - 0.7 v%, thus the rare earth metal content can be reduced to between 0.04 v% - 0.10 v%, thereby the possibility of deciphering is almost impossible as well, because it can only be realized with extremely expensive laboratory analytical methods.
The paper protected against forgery according to the invention, therefore, has a color-coded additive uniformly distributed in an amount of 0.05 v% to 1.5 v%, which contains at least three different rare-earth-metal containing pigments with a grain size of 2- 10 microns in a pre-fixed ratio, as well as a starch-based carrier material in an amount at least equal to the amount of the pigment. The three rare earth metal pigments are preferably yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide. A printing product protected against forgery can be made from the paper according to the invention produced by the process according to the invention.
Paper manufactured by the use of described additive, or a printing product containing such paper is exposed to the exciting radiation source e.g. by using the instrument mentioned above. The wavelength and intensity of the radiation emitted by the additive in the paper and detected by the optical sensor of the instrument's detector definitely depends on the ratio of the three pigments mixed in the additive. One can store this relationship as the code carried by the paper product for the given production batch, and in case of suspected forgery, it can be checked by using e.g. the instrument mentioned above.
Paper production can be conducted by using any of the known technologies, using the homogenized additive described in the description as an additive.
In summary, we have achieved our goal with the invention described. Our solution provides thousands, even millions of unique color combinations as compared to the four combinations disclosed by the document CZ 173430. The method according to the invention is much more accurate compared to the free eye comparison, and during production, the recording and documentation of the wavelength and intensity of the built-in reference signal and its subsequent recovery are also much more precise.

Claims

Claims
1. Method for the production of paper protected against forgery, characterized by
- preparing a pigment component with a particle size of 2-10 microns from a granular pigment base containing rare earth metals,
- pre-mixing the pigment component thus prepared with a starch-based carrier material in a ratio of 1 : 1,
- mixing at least three pigment components pre-mixed with the carrier in a pre-fixed ratio, thereby creating a color-coded additive,
- adjusting the density of the color-coded additive to a density of 0.8-1.5 g/ml fit for paper production technology, by adding an additional starch-based carrier material, if necessary, and then homogenizing the additive, and
- mixing a color-coded additive in a proportion of 0.05 v% to 1.5 v% to paper pulp,
- making paper product of the paper pulp mixed with the additive,
- illuminating the finished paper product with a source of electromagnetic radiation in the wavelength range of 400-1400 nm,
- detecting instrumentally the radiation emitted by the additive,
- recording electronically the physical parameters of detected radiation, and
- assigning recorded physical parameters to the color code of the additive.
2. The method according to claim 1 for the production of paper protected against forgery, characterized by using granular Gd2Y2O4S2, yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide as granular pigment base containing rare earth metals.
3. The method according to claim 2 for the production of paper protected against forgery, characterized by using C18H39CIN4O6 as a starch-based carrier material.
4. The method according to claim 3 for the production of paper protected against forgery, characterized by the pre-fixed ratio used during the mixing of the three pigment components premixed with the carrier is selected from RGB color model.
5. The method according to claim 4 for the production of paper protected against forgery, characterized by setting the density of the color-coded additive to 1.2 g/ml.
6. The method according to claim 5 for the production of paper protected against forgery, characterized by mixing the color-coded additive with the paper pulp by a ratio of 0.4 v% of the pulp.
7. The method according to claim 6 for the production of paper protected against forgery, characterized in that the wavelength and intensity of the radiation are recorded as physical parameters of the detected radiation.
8. Paper protected against forgery, having an additive containing rare earth metal, characterized in that a color-coded additive is evenly distributed in the paper in the amount of 0.05% to 1.5% by weight of the paper, which additive contains at least three different pigments with a grain size of 2-10 microns, each containing rare earth metals and a starch- based carrier material in a quantity at least equal to the amount of the pigment.
9. Paper protected against forgery according to claim 8, characterized in that the three different pigments containing rare earth metals are yttrium oxysulfide doped with gadolinium oxysulfide, lanthanum oxide doped with yttrium oxide, and thulium oxide doped with yttrium oxysulfide.
10. Printed product containing paper produced by a method according to any one of claims 1-7. or a paper according to any one of the claims 8-9.
EP23758711.8A 2022-06-29 2023-06-22 Method for the production of paper protected against forgery, such paper and printing products Pending EP4547908A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
HU2200242A HUP2200242A1 (en) 2022-06-29 2022-06-29 Method for the anti-forgery protection of paper and printed products
PCT/HU2023/050039 WO2024003586A1 (en) 2022-06-29 2023-06-22 Method for the production of paper protected against forgery, such paper and printing products

Publications (1)

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EP4547908A1 true EP4547908A1 (en) 2025-05-07

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EP23758711.8A Pending EP4547908A1 (en) 2022-06-29 2023-06-22 Method for the production of paper protected against forgery, such paper and printing products

Country Status (3)

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EP (1) EP4547908A1 (en)
HU (1) HUP2200242A1 (en)
WO (1) WO2024003586A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050031838A1 (en) * 2003-08-06 2005-02-10 Spectra Systems Corporation Taggant security system for paper products as a deterrent to counterfeiting
US11788231B2 (en) * 2019-06-24 2023-10-17 International Paper Company Paper substrates incorporating covert marking pigments, and processes for obtaining and using same

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WO2024003586A1 (en) 2024-01-04
HUP2200242A1 (en) 2024-01-28

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