FR2771111A1 - Security document - Google Patents

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Publication number
FR2771111A1
FR2771111A1 FR9714609A FR9714609A FR2771111A1 FR 2771111 A1 FR2771111 A1 FR 2771111A1 FR 9714609 A FR9714609 A FR 9714609A FR 9714609 A FR9714609 A FR 9714609A FR 2771111 A1 FR2771111 A1 FR 2771111A1
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France
Prior art keywords
substrate
characterized
security
magnetic particles
document according
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Granted
Application number
FR9714609A
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French (fr)
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FR2771111B1 (en
Inventor
Sandrine Rancien
Thierry Dumery
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Arjo Wiggins SA
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Arjo Wiggins SA
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Priority to FR9714609A priority Critical patent/FR2771111B1/en
Publication of FR2771111A1 publication Critical patent/FR2771111A1/en
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Publication of FR2771111B1 publication Critical patent/FR2771111B1/en
Anticipated expiration legal-status Critical
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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/48Elements suited for physical verification, e.g. by irradiation
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07DHANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00Testing 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
    • G07D7/04Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07FCOIN-FREED OR LIKE APPARATUS
    • G07F7/00Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus
    • G07F7/08Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means
    • G07F7/086Mechanisms actuated by objects other than coins to free or to actuate vending, hiring, coin or paper currency dispensing or refunding apparatus by coded identity card or credit card or other personal identification means by passive credit-cards adapted therefor, e.g. constructive particularities to avoid counterfeiting, e.g. by inclusion of a physical or chemical security-layer
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H19/00Coated paper; Coating material
    • D21H19/02Metal coatings
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/42Ribbons or strips

Abstract

The present invention relates to a security document comprising a substrate consisting of a sheet of paper or cardboard or a plastic sheet obtained by extrusion and at least one zone comprising magnetic particles characterized in that a) said magnetic particles are included in the mass of the substrate or in a coating on the surface of the substrate, b) said magnetic particles do not affect the appearance characteristics of said area, c) said magnetic particles are uniformly distributed in said area. </ p >

Description

SECURITY DOCUMENT
COMPRISING MAGNETIC PARTICLES
The present invention relates to security documents, in particular security papers comprising magnetic particles that make it possible in particular to detect magnetism and / or to store and read by sorting or reading machines equipped with magneto-resistive sensors for recorded information. especially in the form of codes, with inductive heads.

 By security document is meant any document comprising a security element, ie an authentication means for detecting counterfeiting and / or making counterfeiting difficult to achieve, including by photocopying. This may include, in particular, official documents, such as passports or identity cards or means of payment such as banknotes, checks, fiduciary papers, tickets or payment vouchers, but also any paper that the l One wishes to be able to authenticate, such as contracts, deeds or certificates, labels or packaging. By security paper is meant a security document comprising a substrate consisting of a sheet of paper or cardboard. According to the present invention, paper is understood to mean any sheets obtained by wet process using a suspension of natural cellulose fibers and / or synthetic fibers and which may contain various mineral fillers and various additives, such as binders commonly used. in paper mills.

 Up to now, the visibility of magnetic particles has considerably limited their possibility of use in security documents, in particular, security papers. Visibility is here understood to mean that it has been impossible to include them as such in the mass or over the entire surface of the documents, in particular papers, without considerably affecting the appearance characteristics of the latter. For this reason, magnetism has been applied essentially to the surface of security strips, incorporated in banknotes.

 Indeed, it is known, to authenticate papers, including banknotes, to incorporate a narrow band of plastic, said tape or security thread, often made of a transparent polyester covered with a layer of deposited metal Vacuum or printed. The narrow security band may be incorporated into the paper mass in whole or in part according to methods well known to those skilled in the art. These narrow strips can be incorporated in the paper only partially, that is, the tape appears on the surface of the document in certain places, called windows, and this, on at least one part of the document. These security bands are mainly used to constitute a technical difficulty difficult to counterfeit, visually detectable by the public observation in a transmitted environment, and allow detection or reading by a machine.

 Security threads having a magnetic coating have been known for a long time (EP 310 707). And, the magnetism applied to security tapes, has established itself as the most reliable security for reading on a sorting machine.

 The security strips may be coated with a continuous magnetic particle layer capable of receiving information encoded by magnetic recording or intermittently covered with magnetic pads which are printed to create a code (WO 90/08 367).

Magnetic information is read mainly using inductive effect heads
Lobby. These read heads, called inductive heads, measure a difference in magnetic flux. The magnetism layer must be sufficiently concentrated in particles and thick to generate enough flux and allow a good reading. In practice, the thickness of the magnetic layers is of the order of 10 to 15 Il. In addition, the magnetic layers, given their high concentration of magnetic particles appear very dark or black. When you put a band too dark in the paper, it becomes very difficult to make it invisible in reflected light and can be reproduced by photocopy. To make the strip coated with a less visible magnetic layer in reflected light, a metal masking layer is generally deposited, composed of reflective particles such as silver or silver which hides the black of the magnetic pigments but increases the cost of manufacture of the band. In addition, the superposition of the layers necessary for the realization of these strips the thickness of the strip itself (about 12, u) adding to the thickness of the magnetic layer (about 12, u), to that of the metal layer (about 3p) and that of a heat-sealing varnish (about 2, u) applied to the front and back of the web for adhesion in the paper lead to a total web thickness of which causes great difficulties of incorporation into the paper and paper stacking difficulties due to the extra thickness created by the security strips incorporated in the paper.

 On the other hand, to render the strip visually detectable, by observation in transmitted light, it has been proposed (EP 279,880, EP 319,157, EP 516,790 and WO 96,043) to carry positive or negative inscriptions by printing or by demetallization on the surface of the strip.

 All these layer deposition operations, and possibly demetallization of layers - which have different demetallation kinetics - considerably increase the final cost of the tape and greatly complicate the manufacture.

 Traditional inductive sensors which measure a magnetic flux difference by varying the intensity in the coil, require, for a correct reading of the coded information, that the speed of movement of the wire relative to the read head is constant. This is why it has been proposed in EP 610 917 to use not inductive sensors but magneto resistive sensors because these sensors measure the remanent magnetization related to a variation of resistivity in the sensor, which allows a reading speed variable of the wire with respect to the detection head.

However, in EP 610 917, the magnetic coating of the wire comprises more than 15% of magnetic particles mixed in an alumina layer and has a dark opaque color, so that recesses created in said layer, allow the detection by observation in transmitted light of a negative inscription created in said layer,
An object of the present invention is to confer on a security document, in particular a security paper, the ability to be recorded, detected and read by machine thanks to its magnetic properties, without it being necessary to mask the layers. magnetic or magnetic particles to make them invisible.

 In particular, an object of the present invention is to introduce magnetic particles to the surface or into the mass of paper over a wide area.

 Another object of the present invention is to be able to encode magnetic information in increased quantity compared with previous embodiments.

 Other objects and advantages of the present invention will become apparent from the description of the embodiments of the invention, hereinafter.

The present invention provides a security document comprising a substrate consisting of a sheet of paper or cardboard or an extrusion plastic sheet and at least one area comprising magnetic particles characterized in that
a) said magnetic particles are included in the mass of the substrate or in a coating on the surface of the substrate.
b) said magnetic particles do not affect the appearance characteristics of said area, and
c) said magnetic particles are evenly distributed in said area.

 The present invention is more particularly advantageous when said security document is a security paper, that is to say when said substrate consists of a sheet of paper or cardboard.

 The magnetic particles may be included directly in the mass or in a coating on the surface of the substrate, in particular paper, or indirectly, that is to say via a security element. In the latter case, said magnetic particles are included in the mass of said security element or in an applied coating and on the surface of said security element, said security element being itself included in the mass of the substrate, in particular paper or applied on the surface of it.

 By magnetic particles is meant particles in the form of pigments. By security element is meant any element associated with the substrate, including paper and contributing to the authentication of the document or making its infringement difficult. It may be, in particular, a particular coating on the surface of the substrate, in particular paper, or a member included in the mass or applied to the surface of the substrate, in particular paper, such as a plastic strip includes, in whole or in part, in the mass of the substrate, in particular paper, boards or a hologram applied to the surface of the substrate, in particular paper or on another security element.

 Other features of the security documents, especially security papers according to the present invention are defined in the appended claims.

 According to the present invention, it has been discovered that magneto-resistive sensors having a much higher sensitivity to Hall-effect inductive heads previously used, can read coded magnetic information or simply characterize the saturation or remanent magnetization of the pigments, at the same time. concentrations of highly spinnable magnetic particles, in particular, lower than the concentrations allowing detection by inductive sensors, but making the presence of said particles invisible.

 The characteristic that magnetic particles do not affect the appearance characteristics of the zone means that when they are included in the mass of the substrate, in particular paper or included within a security element, it -including all or part of the mass of the substrate, especially paper, or when they are included in a coating on the surface of the substrate, including paper or said security element, it is not possible to discern particles as such, and the appearance, in particular the whiteness and / or the colorimetric coordinates (L *, a *, b *) in the CIELAB system, of the substrate, in particular paper and / or the security element is not or very little modified.

 More particularly, the Delta E * color difference in the CIELAB formula between a control document without magnetic particles and the same document differing only in the presence of magnetic particles according to the present invention is less than 10.

Even more particularly, when the substrate comprising said magnetic particles
is white in color, its ISO whiteness according to ISO 2471 (reflectance at 457 nm) is greater than or equal to 65% and / or its CIE whiteness according to the CIELAB formula is greater than or equal to 30%, and this even in absence of optical brightener.

 This visual characteristic of said magnetic particles, and of the document, in particular the paper comprising them, makes it possible to associate them in the same zone with a security element and / or a visual effect identification element, such as an element comprising inscriptions. intended to be seen without the presence of the magnetic particles occluding the desired visual effect with said security element or the identification element.

 According to the present invention, the magnetic particles can therefore be associated with all the security elements existing in the security documents, in particular the security papers, and / or on large areas of said security documents, which was not the case previously.

They can also allow to store and store quantities of information, much larger than previously, including in the form of magnetic codes and make the area where the magnetic information was recorded and stored invisible to the eye naked and invisible with a magnifying glass.

 According to a feature of the invention related to the sensitivity of magneto-resistive heads, it is necessary that the magnetic particles do not form agglomerates or inhomogeneous aggregates. It is therefore necessary that magnetic particles are uniformly dispersed and distributed in their substrate. Here, by uniform distribution of the magnetic particles, it is meant that the volumetric particle density in said zone, and therefore the saturation or remanent magnetic magnetization in said zone are substantially constant so that there is little or no background noise and in particular that the ratio (background noise) is greater than 20 dB, especially when the width of the magneto-resistive reading head is less than or equal to the width of the inductive recording head. This feature is necessary to read a coded message, recorded in said zone, reliably.

 Said zone comprising said particles may cover all or only part of the substrate.

 The direct incorporation of the magnetic particles into the mass of the substrate, in particular paper or into a coating on the surface of the substrate, in particular paper, in an area covering the entire substrate, makes it possible to considerably extend the possibilities of use of the present invention. However, when the magnetic particles are included directly in the mass of the substrate, in particular paper or in a coating on the surface of the substrate, they can be included in a localized zone, in particular in the form of a strip, in particular in the form of a strip. 1 to 5 cm by methods known to those skilled in the art, said area not necessarily covering the entire substrate.

The magnetic particles may advantageously be incorporated into the mass of the paper by mixing an aqueous dispersion of said particles with the mixture of flores, in particular cellulose or cotton, and conventional papermaking auxiliaries for producing the paper sheet. The present invention is particularly advantageous when the substrate comprising said magnetic particles is a paper substrate and has a light color, especially white, cream or pale yellow. In this case, as mentioned above, the ISO whiteness according to ISO 2471 is preferably greater than or equal to 65% and whiteness
CIE according to the formula CIELAB is preferably greater than or equal to 30%;
The coating on the surface of the substrate, in particular paper may also consist of a plastic film in the mass of which are incorporated the magnetic particles, including a film thickness of 10 to 500, u m.

 When the magnetic particles are included in a coating on the surface of the substrate, in particular paper or on the surface of said security element, this coating may consist of an ink or a varnish or else a coating or sizing composition, which can be applied respectively by printing or coating paper. The coating composition may comprise in particular, besides said magnetic particles, a binder of the polyvinyl alcohol (PVA) type, starch or latex, water and additives.

 The coating composition can be applied by means known to those skilled in the art with coating facilities, such as press-gluing machine, metal-blade coater, air-knife coater, CHAMPION rotary-bar coater, predosed film transfer coater.

 As inks or varnishes, mention is made more particularly of printing inks or varnishes which can be applied by gravure printing, intaglio printing, offset printing or screen printing on a thickness of 1 to 5 μm.

 The surface coating comprising magnetic particles, according to the present invention, may also consist of an adhesive composition applied to the surface of the substrate, in particular paper or said security element, in particular, a heat-sealing varnish facilitating the holding of said element. security in the mass of the substrate, especially paper.

 When said particles are included in a coating on the surface of the substrate, in particular paper or a security element, said coating may advantageously be transparent or translucent.

To satisfy both the appearance characteristics of the paper, particularly the ISO and CIE whiteness values mentioned above, and the uniform distribution characteristics of the magnetic particles of the present invention, and to allow detection of a sufficient signal as well as the recording of an information density at least equal to that used on the magnetic stripes of bank cards, in particular a recording density of at least 8 flux transitions / mm / track, it is advantageous that said particles verify the following concentration and size characteristics, taken separately or in combination:
a) when the particles are included in the mass of the substrate, in particular paper or in a coating applied to the surface of the substrate, in particular paper, their concentration is less than or equal to 0.1%, especially 0.05%, preferably from 0.001% to 0.1%, more preferably 0.01% to 0.1% based on the weight of said substrate in said area.
b) when said particles are included in a coating applied on the surface of said substrate, in particular paper or said security element, the concentration of magnetic particles in said coating is less than or equal to 1%, more particularly 0.01 % at
1%, more particularly from 0.01% to 0.1% of the weight of the coating in said zone.
c) the magnetic particles have a size less than or equal to 2 KL, preferably less than 1 H, in particular from 0.1 to 1, more particularly from 0.1 to 0.5, u. By size is meant here the largest dimension of the particle.

 For amounts less than 0.01%, more particularly less than 0.001%, the signal becomes difficult to detect, especially with a ratio (background noise signal) less than 20 dB under the conditions mentioned above.

 When said security document is a banknote, said security element is optionally constituted by a plastic material security strip comprised wholly or in part in the mass of the substrate, in particular paper, said particles being included in the mass or in a surface coating of said strip.

 According to the present invention, it is possible to apply transparent magnetic layers having a thickness of 1 to 5 on a security strip, enabling the recording and detection of coded magnetic information. In view of the appearance characteristics of said magnetic layer applied to the security tape, it is not necessary to coat the magnetic layer with a metal masking layer. The thickness of the son of the security bands, according to the present invention, is thus considerably reduced compared to previous embodiments of magnetic security tapes. The present invention therefore also relates to safety strips as defined above and more particularly to strips of thickness 10 to 30 C1 and a width of 0.5 mm to 5 cm, preferably 1 to 5 mm.

 It should be noted that the magnetic particle concentrations necessary for a magnetoresistive head detection are so small (a magnetoresistive detector can detect unit grains of pigments) that the pigments can be incorporated into the safety band by depositing a specific magnetic layer or simply by mixing with the existing layers, such as the heat-sealing varnish layer, the printing inks or incorporated into the mass of the plastic wire, itself.

 Security documents, including security papers or security tapes included in said documents, including said papers, including a hologram, are sought because they are difficult to counterfeit, while being aesthetic, and more easily authenticated by the general public . However, these bands in earlier embodiments could not be readily associated with magnetic properties for the following reasons. First of all, the holograms are, themselves, made of multilayer complexes (adhesive layer, embossing lacquer, protective varnish). And, the application of a dark magnetic layer involves the application of an additional layer. In addition, security holograms are often transparent holograms, ie non-metallized holograms or partially demetallized holograms. However, the presence of a dark magnetic layer is on the one hand incompatible with the transparency properties of the hologram and on the other hand, resists the partial demetallization treatment of the hologram, making it impossible to perform a registration. Cleartext type.

 The present invention allows to associate magnetic particles to holograms advantageously. To do this, it suffices to mix the magnetic particles with the layers composing the hologram, such as the embossing lacquer, the protective varnish when the hologram is applied to a security strip, and it is possible to incorporate the magnetic particles in this layer. the mass of said band or in the heat-sealing varnish, allowing said band to adhere to the mass of the paper. In particular, the present invention provides transparent or partially demetallized holograms comprising magnetic particles.

 The present invention provides security strips, having magnetic particles and positive or negative inscriptions in the form of recesses. These types of wires are commonly referred to as Magnetic Cleartext. In the prior art, there are essentially two embodiments. In a first embodiment, a magnetic code is printed.

In the zones of the safety band adjacent to the recessed portions constituting the negative inscriptions, the quantity of magnetic pigments and therefore the density of the remanent magnetic flux is variable according to the shape of the recess. In addition, in some cases, the recesses are very important and the density of the magnetic flux is insufficient to be detected, thus destroying part of the coded message. In a second embodiment, a magnetic track recorded adjacent to a track bearing inscriptions in negation is combined. This requires the inscriptions to be very small, while the search for safety strips bearing the most wide possible that can be easily checked visually. Especially for a wire 3 mm wide, it is difficult to create letters of more than 1 mm in height in a strip coated with a conventional magnetic layer.

 According to the present invention, the mixing of the magnetic particles in the mass of the strip or in a transparent layer of small thickness makes it possible to distribute them uniformly over the entire surface of the security strip. On the other hand, the magnetic particles may be superimposed with respect to said negative inscriptions, which allows to overcome the aforementioned drawbacks.

According to the present invention, for a band 3 mm wide, it is possible to create letters 2.7 mm high, which on the one hand, increases the visibility of the inscriptions by a factor of 3 to 4 and in addition, simplifies the process of making negative entries and reduces the cost.

 In an alternative embodiment of the invention, the magnetic particles are included in a flini This variant makes it possible to produce plastic safety strips with particles in the mass, said strips being cut from said plastic film incorporating said particles.

This variant is also particularly suitable for making passports or identity cards or other documents that are covered with a protective film variable mentions on the document.
It is known to digitize information corresponding to a photograph of identity or variable mentions and to magnetically record them in the form of a 2 D bar code on a sheet of paper. The major drawbacks of these barcode recordings reside in that they are visible, easy to copy and require a significant space available on the document. The space available to record and store all the desired magnetic information, if it is desired that it not be visible, is very small so as not to interfere with the standard layouts.

 According to the present invention, it is possible to record and store magnetically information, in particular digitized information, corresponding to a photograph of identity and / or to the variable mentions of the passport or the identity card in the mass of the protective film itself. without this information being visible. The advantages of this solution are at least twofold: there is no more problem of space limitation, since the whole page can be used as a support to record the standardized information, and the place where the information is recorded is not visible.

 According to another variant embodiment of the present invention, the magnetic particles are included in an adhesive. The advantages of this variant, in addition to those mentioned above for the transparent plastic film, are that the adhesive constitutes a malleable recording medium and ductile hot relatively more fragile than a film. Thus, if the adhesive is constituted by the adhesive of the protective film of the passport, any attempt to lift the film alters the adhesive and destroys the magnetic information recorded, which is an additional security.

 The present invention thus makes it possible to produce a security document consisting of a passport or identity card sheet or a substrate intended for the production of a passport or identity card sheet in which said magnetic particles are applied. in the mass of said substrate or on a transparent protective plastic film of said passport or identity card sheet or in an adhesive allowing said film to adhere to said sheet.

 The present invention also makes it possible to produce a security document consisting of a packaging sheet or a sheet of paper or plastic intended for the manufacture of a packaging sheet, said magnetic particles being incorporated into the mass of the substrate constituting said sheet or in a coating applied to the surface of said substrate.

 The present invention also makes it possible to produce security labels made of paper or plastic that are particularly advantageous. The magnetic particles may be incorporated into the mass of the substrate or in a coating applied to the surface of the substrate on the front of the label, in particular in a coating of the transparent varnish type, or on the back, in particular in an adhesive applied to the surface of said substrate on its back. In any case, the recorded magnetic information does not during the use of the support, it is sufficient to remagnetize the areas (pads) by bringing them to magnetic saturation before performing the detection.

 In the second embodiment, the support is entirely covered with magnetic particles and the recording of the bits is by magnetization with fields whose direction of magnetization is reversed in localized regions. More precisely, certain regions of the saturation medium are carried in one direction or another, said regions then corresponding to the magnetic bits 0 or respectively 1 of the coded information. In this second embodiment, it is not acceptable that the bits can be demagnetized because it is no longer possible to restore the information before detection or reading. It is therefore necessary in this second embodiment to use magnetic particles of high coercivity, which are not likely to be demagnetized by simple use.

In each of the two embodiments, the length of the magnetized areas can be varied to create a bar code.

 For making documents, especially magnetically recordable papers, coercivity particles of 23.873 x 103 to 795.775 x 103 A / m (300 to 10,000 Oe) are used. High coercivity materials of the order of 79,577 x 103 to 397,887 x 103 (1000 to 5000 Oe), such as barium and strontium ferrites, in particular BaFel2 019 or Str Fel2019, are commonly used.

 The subject of the present invention is also a method for manufacturing a security document according to the invention, characterized in that said magnetic particles are incorporated in the mass of the substrate or in a coating at the surface of the substrate in said zone. said particles having a size and a concentration such that they do not affect the appearance characteristics of said area.

 More particularly, a dispersion of magnetic particles is mixed with the base material of the substrate or a coating applied to the surface of the substrate. Different types of coating that can be applied to the surface of the substrate have been described above.

 In one embodiment, an aqueous dispersion of magnetic particles according to the invention is mixed with the paper pulp to be used for the production of said substrate consisting of a sheet of paper or cardboard.

 In another embodiment, said particles are incorporated in the mass of a security element or in a coating applied on the surface of the security element, and said security element is incorporated in the mass of said substrate or said application is applied. security element at the surface of said substrate. Different types of coating that can be applied to the surface of said security element have been described above.

 Other objects, features and advantages of the present invention will appear in the light with embodiments that follow.

EXAMPLE 1 Comparative and Examples 2 to 6 According to the Invention
Magnetic paper is produced as follows:
Cellulose fibers comprising 60% long fibers and 40% short fibers are suspended in water; this suspension is refined to 40 degrees Schoepper-Riegler. Then an aqueous predispersion of magnetic pigments at different rates as indicated in Table 1 is added, Comparative Example 1 not containing magnetic pigments and 6%, by dry weight of the fibers, of carbon dioxide pigments are also added. titanium as mineral fillers bringing whiteness and opacity. A neutral bonding agent (0.4% by dry weight of an alkyl ketene dimer) and a retention agent [0.6% by dry weight of a poly (ethyleneimine)] are added; the percentages being expressed with respect to the cellulose fibers.

The predispersion of magnetic pigments is achieved by introducing the pigments into water with a rheology regulator such as polyvinyl alcohol and a dispersant and wetting pigments. This dispersion thus has a good affinity with cellulose and is stabilized so that the pigments do not agglomerate when the dispersion is diluted and then mixed with the paper composition.

The magnetic pigments are strontium ferrite particles and have a coercivity of 159.155 x 103 A / m (2000 Oe); the largest particle size is less than about 1 μm.

The resulting paper sheets have an average basis weight of 93 g / m2.

As usual, the surface of the paper obtained in the size press is treated with a starch solution and a starch insolubilizer, a melamine-formaldehyde resin, in order to improve their printability.

The samples are lightly calendered.

The finished samples have a basis weight of 95 g / m2 and an average thickness of 122 Clm
The respective amounts of the compounds introduced into the samples are given in the
Table 1, as well as the colorimetric results.

The papers obtained are tested according to the conditions described below.

It is considered that magnetic papers having a Delta E * in color difference strictly less than 10 are suitable, which is corroborated with the fact that magnetic papers having an ISO whiteness greater than or equal to 65% are suitable. the papers must therefore contain at most 0.2% of magnetic pigments.

Preferably the magnetic papers have a Delta E * in color difference of less than or equal to 5.

Good magnetic data recording and reading is obtained on all samples with magnetic pigments with a ratio (signal / background noise) greater than 20 dB.

The control without pigments has a background signal but much lower than the samples according to the invention.

EXAMPLE 7 Comparative and Example 8
A magnetic paper is produced which may be suitable as paper for making a banknote as follows
A cotton fiber paste is suspended in water to which is added the aqueous predispersion of magnetic pigments used in the preceding examples, at a level of 0.05% by dry weight, comparative Example 7 not comprising magnetic pigments and 6%, by dry weight relative to the fibers, of titanium dioxide pigments as mineral fillers providing whiteness and opacity; this suspension is refined to 55 degrees Schoepper-Riegler. Then a wet strength agent (3% by dry weight, a melamine-formaldehyde resin) and a retention agent [0.5% by dry weight of a polyacrylamide] are added, the percentages being expressed with respect to the cotton fibers. .

The resulting paper sheets have an average basis weight of 85 g / m2.

The paper is impregnated with a solution of polyvinyl alcohol and possibly with a glycerine composition to improve the printability of the paper and provide the strength necessary for circulation of the note.

The papers are lightly calendered.

The finished samples have a basis weight of 87 g / m 2 and an average thickness of 120 μm.

The respective amounts of the compounds introduced into the samples as well as the colorimetric results are given in Table 1.

The papers obtained are tested according to the conditions described below.

Good recording and reading of the magnetic data is obtained on the sample with magnetic pigments with a ratio (signal / background noise) greater than 20 dB. The control without pigments has a background signal but much lower than the samples according to the invention.

EXAMPLE 9
A security thread is made as follows:
On a polyester film approximately 19 m thick, an impression is made so that the significant characters are constituted by transparent recesses surrounded entirely by an opaque zone, these characters have a height of 0.8 mm. .

In this printing, a layer containing the magnetic pigments used in the preceding examples is deposited in a mixture in a heat-sealable polyester varnish.

The magnetic layer is deposited by gravure coating at 4 gim2 and contains 1% of magnetic pigments, it is 4 ssm thick.

The heat-sealable varnish alone is deposited on the other side of the wire in order to hold the wire securely in the sheet of paper.

The total thickness of the film is 30 Fm.

The film is cut into threads (strips) 1.2 mm wide.

The wire is introduced into a banknote paper so as to make the wire appear in windows according to the method described in the European patent EP 59056.

Magnetic data are recorded and read according to the conditions described below.

An advantage of this thread is that it is detectable magnetically and that significant characters are observed on the wire 'it allows writing magnetic data and / or significant characters visible over the entire width of the wire (the magnetic layer being transparent).

Compared to the prior art, it does not require a masking layer of the magnetic zones to make them non-photocopiable and reduces the thicknesses related to its introduction into a sheet of paper (because it is about 5 μm less in thickness compared to to a wire of the prior art having the same information data).

The papers are tested according to the conditions described below.

CONDITIONS OF MEASUREMENTS AND TESTS: - The basis weight is measured according to ISO 536 after conditioning according to ISO 187.

- Colorimetric tests: measurements of the colorimetric and whiteness characteristics to define the appearance of the paper were carried out on an ELREPHO 2000 spectrocolorimeter in the CIE system under illuminant D65 (daylight and without UV) and under an observation angle of 10 degrees, the sheets being superimposed in sufficient number to have a thickness giving the required opacity.

The colorimetric coordinates L *, a *, b * in the CIELAB system were measured and from these the Delta E * color deviation was calculated between the control sample (without magnetic pigments) and the samples with magnetic pigments. according to the following formula:
Delta E * = square root [(L * oL * i) 2 + (a * 0-a * s) 2 + L * o, a * 0, b * o being the CIELAB coordinates of the control, L * i,, b * i being the CIELAB coordinates of the sample i.

The CIE whiteness is also determined according to the CIELAB formula.

ISO whiteness is also determined according to ISO 2471 (reflectance at 457 nm).

- Magnetic tests:
Magnetic data recording: for each sample, eight flux transitions (denoted ft) magnetic (that is to say eight successive regions of opposite magnetizations) per millimeter are recorded on a track, according to the NF EN ISO standard. / IEC 10373.

This recording is done using a conventional inductive recording head having a writing gap of 50 lm. The writing width is 1 cm and the recording speed is 200 mm / s.

The pressure forces exerted between the recording head and the paper samples and the head-to-sample distance have been selected so as to have the best recording possible and a maximum amplitude of the signal during the reading.

Magnetic data reading: the magnetic recording of the samples is read with a magneto-resistive reading head.

This magnetoresistive read head has a magnetoresistance coefficient of 2% and the saturation field is less than 7.957 x 103 A / m (100 Oe) and has a reading width of 1 cm. The head-to-sample distance is less than 200 μm. The current intensity in the magnetoresistance is set to 12 mA.

Thanks to an operating unit, we read an output signal in millivolts (voltage difference resulting from the variation of the resistivity of the head during the passage of the sample) which translates, in absolute value, the magnetic flux transitions recorded. It also determines the ratio R output signal / background noise, this ratio must be at least equal to 2 to be acceptable.

- The dosage of the total iron is made according to standard NF-T-12025.

Figure img00170001

example <SEP> 1 <SEP> example <SEP> 2 <SEP> example <SEP> 3 <SEP> example <SEP> 4 <SEP> example <SEP> 5 <SEP> example <SEP> 6 <SEP> example <SEP> 7 <SEP> example <SEP> 8
<tb> comparative <SEP> comparative
<tb> quantity <SEP> of <SEP> 0 <SEP> 0.003 <SEP> 0.005 <SEP> 0.010 <SEP> 0.100 <SEP> 0.200 <SEP> 0 <SEP> 0.050
<tb> pigments
<tb> magnetic
<tb> introduced <SEP> (%)
<tb> quantity <SEP> of <SEP> iron <SEP> total <SEP> 0.0042 <SEP> 0.0054 <SEP> 0.0070 <SEP> 0.0083 <SEP> 0.0452 <SEP> 0 , 0800 <SEP> 0.0033 <SEP> 0.080
<tb> metered <SEP> (%)
<tb> Delta <SEP> E * <SEP> 0.0 <SEP> 0.8 <SEP> 1.1 <SEP> 1.9 <SEP> 9.1 <SEP> 13.4 <SEP> 0, 0 <SEP> 4.3
<tb> Whiteness <SEP> CIE <SEP> (%) <SEP> 71.8 <SEP> 69.8 <SEP> 68.8 <SEP> 66.5 <SEP> 42.1 <SEP> 29.3 <SEP> 77.9 <SEP> 63.1
<tb> Whiteness <SEP> ISO <SEP> (%) <SEP> 85.6 <SEP> 84.0 <SEP> 83.3 <SEP> 81.4 <SEP> 65.0 <SEP> 56.4 <SEP> 87.5 <SEP> 77.1
<tb> TABLE 1

Claims (37)

  1.  A security document comprising a substrate consisting of a sheet of paper or cardboard or an extrusion plastic sheet and at least one area comprising magnetic particles characterized by:
     a) said magnetic particles are included in the mass of the substrate or in a coating on the surface of the substrate,
     b) said magnetic particles do not affect the appearance characteristics of said area,
     c) said magnetic particles are evenly distributed in said area.
  2.  2. Security document according to claim 1, characterized in that it is a security paper, said substrate consisting of a sheet of paper or cardboard.
  3.  3. Security document according to claim 1 or 2, characterized in that said magnetic particles are included directly in the mass of the substrate or in a coating on the surface of the substrate.
  4.  4. Security document according to claim 3, characterized in that said magnetic particles are included in a security element or a coating applied on the surface of a security element, said security element being included in the mass or applied on the surface said substrate.
  5.  5. Security document according to claim 4, characterized in that said security element is constituted by a plastic material security strip completely or partly in the mass of the substrate.
  6.  6. Security document according to one of claims 1 to 5, characterized in that said particles are included in a said coating on the surface of the substrate, said coating consisting of a coating composition when the substrate is plastic or paper or a sizing composition when the substrate is paper.
  7.  7. Document according to one of claims 1 to 5, characterized in that said particles are included in a said coating on the surface of said substrate or a said security element, said coating consisting of a varnish or an ink that can be applied by printing techniques such as rotogravure, offset printing or screen printing.
  8.  8. Security document according to one of claims 1 to 5, characterized in that said magnetic particles are included in said coating on the surface of the substrate or said security element, said coating consisting of an adhesive.
  9.  9. Security document according to one of claims 1 to 8, characterized in that said magnetic particles are included in said coating on the surface of the substrate, said coating consisting of a plastic film in the mass of which said particles are incorporated.
  10.  10. Security document according to one of the preceding claims, characterized in that the magnetic particles are included in a coating applied to a hologram or in a layer constituting a hologram.
  11.  11. Document according to claim 5, characterized in that said hologram is a transparent hologram or partially demetallized hologram.
  12.  12. security document according to claim 10 or 11, characterized in that said hologram is applied on a security band partly comprised in said substrate, said hologram being visible in the parts appearing on the surface of the document.
  13.  13. Security document according to one of the preceding claims, characterized in that the magnetic particles are included in a coating applied to an area with positive or negative inscriptions, on a security band included, in whole or in part, in said substrate.
  14.  14. Security document according to claims 5, 12 or 13, characterized in that said magnetic particles are included in a heat-sealing varnish applied to the surface of said security strip or in the mass of said plastic strip.
  15.  15. Security document according to one of the preceding claims, characterized in that said security document is a bank note or a sheet of paper or plastic for printing a bank note.
  16.  16. Security document according to one of claims 1 to 9, characterized in that said document is a label or a sheet of paper or plastic for the manufacture of a label and said magnetic particles are included in the mass of said substrate, or in a coating applied to the surface of said substrate on its front, or in an adhesive applied to the surface of said substrate on its back.
  17.  17. Security document according to one of claims 1 to 9, characterized in that said document is a passport or identity card sheet or a substrate for the production of a passport or card sheet. identity and said magnetic particles are applied in the mass of the substrate, or on a transparent plastic film for protecting said passport or identity card sheet, or in an adhesive allowing said fihi to adhere to said sheet.
  18.  18. Security document according to one of claims 1 to 9, characterized in that said document is a packaging sheet or a sheet of paper or plastic for the manufacture of a packaging sheet.
  19.  19. Security document according to one of claims 1 to 18, characterized in that said area covers the entire substrate.
  20.  20. Security document according to one of claims 1 to 18, characterized in that it comprises a succession of said zones comprising magnetic particles included in a coating on the surface of said substrate or said security element, said areas being separated by regions devoid of magnetic particles, this succession of said zones constituting a magnetic coding.
  21.  21. Safety document according to one of claims 1 to 20, characterized in that said zone comprises coercivity particles greater than 23.873 x 103 A / m (300 Oe), preferably 79.577 x 103 A / m (1000 Oe). ), said area being slfEsamment extended to support the magnetic recording of a code.
  22.  22. Security document according to one of the preceding claims, characterized in that said magnetic particles are included in the mass of the substrate or in a coating applied to the surface of the substrate, at a concentration less than or equal to 0.1%, preferably 0.05 % by weight of said substrate in said zone.
  23.  23. Security document according to claim 22, characterized in that the concentration of magnetic particles is 0.001% to 0.1%, preferably 0.01% to 0.1%.
  24.  24. Security document according to one of the preceding claims, characterized in that said particles are included in a coating applied on the surface of said substrate or of said security element and the concentration of magnetic particles in said coating is less than or equal to at 1% by weight of the coating in said zone.
  25.  25. Security document according to claim 24, characterized in that the concentration of magnetic particles in said coating of said zone is from 0.01 to 0.1%.
  26.  26. Security document according to one of the preceding claims, characterized in that the size of the magnetic particles is less than 2, preferably less than 1 p.
  27.  27. Security document according to claim 26, characterized in that the size of the magnetic particles is 0.1 to 1, preferably 0.1 to 0.5 p.
  28.  28. Security document according to one of the preceding claims, characterized in that the substrate is paper and has a light color, including white, cream or pale yellow.
  29.  29. Security document according to one of the preceding claims, characterized in that the ISO whiteness according to ISO 2471 of the substrate is greater than or equal to 65%.
  30.  30. Security document according to one of the preceding claims, characterized in that the EC whiteness according to the CIELAB formula of the substrate is greater than or equal to 30%.
  31.  31. Security document according to one of the preceding claims, characterized in that said coating on the surface of the substrate or said security element is transparent or translucent.
  32.  32. A security strip intended to be incorporated in a document according to one of the preceding claims, characterized in that it comprises the characteristics of the security band defined in claims 5, 7, 8, 12 to 15, 20 to 20. 27, and 31.
  33.  33. Safety strip according to claim 32, characterized in that it has a thickness of preferably 10 to 30 m and a width of 0.5 mm to 5 cm, preferably 1 to 5 min.
  34.  34. A method of manufacturing a security document according to one of claims 1 to 31, characterized in that one incorporates said magnetic particles in the mass of the substrate or in a coating on the surface of the substrate in said area, said particles having a size and a concentration such that they do not affect the appearance characteristics of said area.
  35.  35. A method of manufacturing a security document according to claim 34, characterized in that a dispersion of magnetic particles is mixed with the base material of the substrate or a coating applied to the surface of the substrate.
  36.  36. The method of claim 34 or 35, characterized in that an aqueous dispersion of magnetic particles is mixed with the paper pulp to be used for the manufacture of the substrate consisting of a sheet of paper or cardboard.
  37.  37. Method according to one of claims 34 to 36, characterized in that one incorporates said particles in the mass of a security element or in a coating applied to the surface of the security element, and incorporates said security element in the mass of said substrate or said security element is applied to the surface of said substrate.
FR9714609A 1997-11-20 1997-11-20 Security document comprising magnetic particles Expired - Fee Related FR2771111B1 (en)

Priority Applications (1)

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FR9714609A FR2771111B1 (en) 1997-11-20 1997-11-20 Security document comprising magnetic particles

Applications Claiming Priority (15)

Application Number Priority Date Filing Date Title
FR9714609A FR2771111B1 (en) 1997-11-20 1997-11-20 Security document comprising magnetic particles
ZA9810576A ZA9810576B (en) 1997-11-20 1998-11-19 Security paper comprising magnetic particles
ARP980105863 AR013768A1 (en) 1997-11-20 1998-11-19 Security document includes magnetic particles, and utilization method of reading the same security band incorporated therein and method of manufacture of the document.
AT98955705T AT224978T (en) 1997-11-20 1998-11-20 A security document containing magnetic particles
AU12453/99A AU1245399A (en) 1997-11-20 1998-11-20 Security document comprising magnetic particles
EP19980955705 EP1034330B1 (en) 1997-11-20 1998-11-20 Security document comprising magnetic particles
AT98955704T AT219598T (en) 1997-11-20 1998-11-20 Safety information carrier
ES98955705T ES2185229T3 (en) 1997-11-20 1998-11-20 Security document comprising magnetic particles.
PCT/FR1998/002481 WO1999027531A1 (en) 1997-11-20 1998-11-20 Data medium
DE1998608331 DE69808331T2 (en) 1997-11-20 1998-11-20 A security document containing magnetic particles
PCT/FR1998/002482 WO1999027185A1 (en) 1997-11-20 1998-11-20 Security document comprising magnetic particles
EP98955704A EP1034536B1 (en) 1997-11-20 1998-11-20 Data security medium
DE1998606181 DE69806181T2 (en) 1997-11-20 1998-11-20 Safety information carrier
ES98955704T ES2178281T3 (en) 1997-11-20 1998-11-20 Support information security.
AU12452/99A AU1245299A (en) 1997-11-20 1998-11-20 Data medium

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FR2771111A1 true FR2771111A1 (en) 1999-05-21
FR2771111B1 FR2771111B1 (en) 1999-12-17

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AT (2) AT219598T (en)
AU (2) AU1245299A (en)
DE (2) DE69806181T2 (en)
ES (2) ES2178281T3 (en)
FR (1) FR2771111B1 (en)
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US6533183B2 (en) 2000-05-03 2003-03-18 Novo Nordisk A/S Coding of cartridges for an injection device
WO2003091952A3 (en) * 2002-04-25 2004-01-22 Rue De Int Ltd Transparent security substrate with magnetic paricles
WO2007110588A1 (en) * 2006-03-24 2007-10-04 Prime Technology Llc Using markers to identify objects for visually-impaired people
US8187406B2 (en) * 2005-12-01 2012-05-29 Arrow Coated Products, Ltd. Method of producing a high security film and high security film produced by said method
US8197449B2 (en) 2005-05-10 2012-06-12 Novo Nordisk A/S Injection device comprising an optical sensor
US9950117B2 (en) 2009-02-13 2018-04-24 Novo Nordisk A/S Medical device and cartridge

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AT354389T (en) 2000-08-10 2007-03-15 Novo Nordisk As Device for administering medicaments with a cassette holder
DE10342079B8 (en) * 2003-09-10 2006-07-06 Spirit Gmbh Method for producing a printing unit
CA2623118A1 (en) 2005-09-22 2007-04-12 Novo Nordisk A/S Device and method for contact free absolute position determination
DE602007008537D1 (en) 2006-03-20 2010-09-30 Novo Nordisk As Contact-free reading of memory identification codes
EP2011223B1 (en) 2006-04-12 2018-06-13 Novo Nordisk A/S Absolute position determination of movably mounted member in medication delivery device
AU2007242758B2 (en) 2006-04-26 2012-04-05 Novo Nordisk A/S Contact free absolute position determination of a moving element in a medication delivery device
EP2125083B1 (en) 2007-03-21 2013-08-21 Novo Nordisk A/S A medical delivery system having container recognition and container for use with the medical delivery system
DE102008032781A1 (en) * 2008-07-11 2010-01-21 Klöckner Pentaplast GmbH & Co. KG Packaging film for product authentication, authentication method and system

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US6533183B2 (en) 2000-05-03 2003-03-18 Novo Nordisk A/S Coding of cartridges for an injection device
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WO2003091953A3 (en) * 2002-04-25 2004-02-12 Rue De Int Ltd Transparent security substrate with magnetic particles
US9483719B2 (en) 2002-04-25 2016-11-01 De La Rue International Limited Security substrate comprising a magnetic layer and opaque and non-opaque regions
US8197449B2 (en) 2005-05-10 2012-06-12 Novo Nordisk A/S Injection device comprising an optical sensor
US8771238B2 (en) 2005-05-10 2014-07-08 Novo Nordisk A/S Injection device comprising an optical sensor
US9522238B2 (en) 2005-05-10 2016-12-20 Novo Nordisk A/S Injection device comprising an optical sensor
US8187406B2 (en) * 2005-12-01 2012-05-29 Arrow Coated Products, Ltd. Method of producing a high security film and high security film produced by said method
WO2007110588A1 (en) * 2006-03-24 2007-10-04 Prime Technology Llc Using markers to identify objects for visually-impaired people
US9950117B2 (en) 2009-02-13 2018-04-24 Novo Nordisk A/S Medical device and cartridge

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EP1034330A1 (en) 2000-09-13
EP1034536A1 (en) 2000-09-13
ES2178281T3 (en) 2002-12-16
DE69806181T2 (en) 2003-02-13
AT219598T (en) 2002-07-15
EP1034536B1 (en) 2002-06-19
ZA9810576B (en) 1999-05-20
FR2771111B1 (en) 1999-12-17
AU1245299A (en) 1999-06-15
EP1034330B1 (en) 2002-09-25
DE69808331D1 (en) 2002-10-31
DE69808331T2 (en) 2003-08-07
WO1999027185A1 (en) 1999-06-03
DE69806181D1 (en) 2002-07-25
ES2185229T3 (en) 2003-04-16
AU1245399A (en) 1999-06-15
AT224978T (en) 2002-10-15
WO1999027531A1 (en) 1999-06-03
AR013768A1 (en) 2001-01-10

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