EP0030507A1 - Security paper using a means for marking and recognition - Google Patents
Security paper using a means for marking and recognition Download PDFInfo
- Publication number
- EP0030507A1 EP0030507A1 EP80401749A EP80401749A EP0030507A1 EP 0030507 A1 EP0030507 A1 EP 0030507A1 EP 80401749 A EP80401749 A EP 80401749A EP 80401749 A EP80401749 A EP 80401749A EP 0030507 A1 EP0030507 A1 EP 0030507A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic material
- support
- means according
- temperature
- paper
- 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.)
- Granted
Links
Classifications
-
- 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
Definitions
- the present invention relates to a marking and recognition means, of the type comprising, carried by a support, a magnetic material.
- the invention relates, more particularly, as a new industrial product, a security paper comprising as security means a product of which certain specific properties are easily detectable.
- the object of the present invention is in particular to propose a marking means using at least one magnetic material whose special properties constitute a very specific means of recognition, this recognition being based on rapid and easy detection of said magnetic material.
- this object is achieved, in accordance with the invention, due to the fact that this magnetic material has a thermomagnetic transition temperature situated in the temperature range which the support can withstand without damage, whereby the presence of said material on the support can be recognized. by a non-destructive test consisting in heating the support to the transition temperature to observe the effect of this temperature on a magnetization of the magnetic material.
- These first order transformations are, for example, the antiferro-ferromagnetic, ferromagnetic-antiferromagnetic, ferromagnetic-paramagnetic transitions.
- These materials can be deposited on the surface of the paper by a printing or coating process or they can be integrated into the mass thereof.
- the integration may be done in particular in the form of fibers, powders, wires, safety strips made from said materials or containing them or serving as their support.
- the papers containing these materials can be printed and then laminated without the means of recognition being able to be called into question.
- the magnetic material is chosen from the following materials: FeRh, MnAs, Mn 3 S bN, Mn 3 SnC, and (Mn 1-x Cr x ) 2 Sb.
- These exemplary materials are of the first order transition type, and are particularly advantageous for applications in security paper, since it is known that their very small number and the specific and exceptional nature of their property makes it impossible to use them. substitution of a classic material.
- This material is antiferromagnetic at room temperature and becomes ferromagnetic above 52 ° C.
- the varnish is deposited on a polyester film (20 microns thick) by a heliographic printing process, the quantity of varnish deposited is of the order of 5 to 10 grams per m2.
- the polyester film is then cut into strips 0.6 mm wide.
- a similar application can be made from first-order transition materials, such as SbMn 3 N whose ferro-paramagnetic transition temperature is 88 ° C, or SnMn 3 S whose transition temperature is 17 ° vs.
Abstract
Description
La présente invention concerne un moyen de marquage et de reconnaissance, du type comportant, porté par un support, un matériau magnétique.The present invention relates to a marking and recognition means, of the type comprising, carried by a support, a magnetic material.
L'invention concerne, plus particulièrement, en tant que produit industriel nouveau, un papier de sécurité comportant comme moyen de sécurité un produit dont certaines propriétés spécifiques sont facilement détectables.The invention relates, more particularly, as a new industrial product, a security paper comprising as security means a product of which certain specific properties are easily detectable.
Pour se prémunir contre les contrefaçons de documents de sécurité tels que billets de banque, titres, actions, cartes d'identité, chèques ou autres documents de valeur, on a déjà proposé l'utilisation de moyens de sécurité divers tels que filigranes, fibres colorées ou métalliques ou métallisées, défaut d'azurant optique, bandelettes de sécurité métallisées, fluorescentes, magnétiques (voir notamment le brevet britannique N° 1.127.043). Ces moyens de sécurité sont dits "de reconnaissance" car ils permettent de reconnaître l'authenticité d'un tel papier.To protect against counterfeit security documents such as banknotes, securities, shares, identity cards, checks or other valuable documents, the use of various security means has already been proposed such as watermarks, colored fibers or metallic or metallized, defective optical brightener, metallized, fluorescent, magnetic safety strips (see in particular British patent N ° 1,127,043). These security means are called "recognition" because they allow the authenticity of such paper to be recognized.
Il est déjà connu d'introduire dans un papier des composés ferromagnétiques sous les formes les plus diverses. Les produits magnétiques utilisés jusqu'alors sont détectés par leur champ coercitif ou leur rémanence qui peuvent avoir des valeurs élevées, mais ces produits sont déjà commercialisés donc facilement accessibles à l'homme de la rue.It is already known to introduce ferromagnetic compounds in the most diverse forms into a paper. The magnetic products used until then are detected by their coercive field or their persistence which can have high values, but these products are already on the market and therefore easily accessible to the man on the street.
On connaît par un article de BERKOWITZ et al, intitulé "Magnetic Tagging", tiré de I EEE TRANSACTIONS ON MAGNETICS, vol. Mag 11, n° 5, Septembre 1975, pp. 1576 - 1581, un procédé consistant à inclure dans un matériau à étiqueter une pluralité de particules ferro-magnétiques dont les températures de Curie sont différentes, de façon à fournir une information complexe qu'il faut ensuite décoder par une lecture exigeant des moyens élaborés et coûteux, lecture au cours de laquelle on fait varier la température du matériau étiqueté de façon continue et sur une large plage de façon à déterminer la nature des différentes particules ferromagnétiques en présence dans le matériau étiqueté.We know from an article by BERKOWITZ et al, entitled "Magnetic Tagging", taken from I EEE TRANSACTIONS ON MAGNETICS, vol. Mag 11, n ° 5, September 1975, pp. 1576 - 1581, a method of including in a labeling material a plurality of ferro-magnetic particles whose Curie temperatures are different, so as to provide information plex which must then be decoded by a reading requiring sophisticated and expensive means, reading during which the temperature of the labeled material is varied continuously and over a wide range so as to determine the nature of the different ferromagnetic particles present in the labeled material.
La présente invention a notamment pour but de proposer un moyen de marquage utilisant au moins un matériau magnétique dont les propriétés spéciales constituent un moyen très spécifique de reconnaissance, cette reconnaissance étant fondée sur une détection rapide et facile dudit matériau magnétique.The object of the present invention is in particular to propose a marking means using at least one magnetic material whose special properties constitute a very specific means of recognition, this recognition being based on rapid and easy detection of said magnetic material.
Ce but est atteint, conformément à l'invention, du fait que ce matériau magnétique présente une température de transition thermomagnétique située dans le domaine de température que peut supporter sans dommage le support, moyennant quoi, on peut reconnaître la présence dudit matériau sur le support par un test non destructif consistant à chauffer le support à la température de transition pour observer l'effet de cette température sur une aimantation du matériau magnétique.This object is achieved, in accordance with the invention, due to the fact that this magnetic material has a thermomagnetic transition temperature situated in the temperature range which the support can withstand without damage, whereby the presence of said material on the support can be recognized. by a non-destructive test consisting in heating the support to the transition temperature to observe the effect of this temperature on a magnetization of the magnetic material.
Ainsi, le moyen selon l'invention est basé sur la détection d'une forte variation thermique de l'aimantation d'un ou plusieurs matériaux judicieusement choisis placés ou non dans un champ magnétique. Ces matériaux qui constituent pour l'article qu'ils marquent une sorte de mot de passe, peuvent être :
- a) des composés ferromagnétiques dont le point de Curie se situe dans une gamme de températures compatibles avec la tenue thermique du support. On sait en effet que tout composé ferromagnétique voit son aimantation disparaître au-delà d'une température critique appelée température de Curie et définie thermodynamiquement comme une transition de second ordre.On entend par "composé ferromagnétique" un composé -ou alliage- présentant une composante ferromagnétique.
- b) des matériaux ayant des propriétés magnétiques plus complexes qui pourront manifester une très brusque variation thermique de l'aimantation. Cette transformation est thermodynamiquement définie comme une transition de premier ordre. On trouvera plus de détails sur ces définitions dans la "Théorie du Magnétisme" de A. HERPIN, P. 278, Presses Universitaires de France. On connaît des matériaux en nombre réduit présentant ce type de transformation -ou transition- du premier ordre.
- a) ferromagnetic compounds whose Curie point lies in a range of temperatures compatible with the thermal behavior of the support. We know that any ferromagnetic compound sees its magnetization disappear beyond a critical temperature called Curie temperature and defined thermodynamically as a second order transition. We mean by "ferromagnetic compound" a compound - or alloy - with a ferromagnetic component.
- b) materials with more complex magnetic properties which may manifest a very sudden thermal variation of the magnetization. This transformation is thermodynamically defined as a first order transition. More details on these definitions can be found in "Theory of Magnetism" by A. HERPIN, P. 278, Presses Universitaires de France. There are known materials in reduced number having this type of transformation - or transition - of the first order.
Ces transformations du premier ordre sont, par exemple, les transitions antiferro-ferromagnétiques, ferromagnétiques-antiferromagnétiques, ferromagnétiques- paramagnétiques.These first order transformations are, for example, the antiferro-ferromagnetic, ferromagnetic-antiferromagnetic, ferromagnetic-paramagnetic transitions.
Le nombre réduit de matériaux de cette seconde catégorie et la haute technicité généralement nécessaire à leur fabrication constituent des facteurs de sécurité nouveaux. De plus, pour les transitions du premier ordre, la variation de l'aimantation est très brutale : elle a lieu dans une plage de températures étroite, au plus égale à 7 degrés centigrades, (intervalle parfois aussi réduit que 1 à 2°C),tandis que, pour les transitions du deuxième ordre, cette plage est de l'ordre de 40 â 50 degrés centigrades.The reduced number of materials in this second category and the high technicality generally required for their manufacture constitute new safety factors. In addition, for first order transitions, the variation of the magnetization is very brutal: it takes place in a narrow temperature range, at most equal to 7 degrees centigrade, (interval sometimes as reduced as 1 to 2 ° C) , while, for second order transitions, this range is in the range of 40 to 50 degrees centigrade.
Ces matériaux pourront être déposés en surface du papier par un procédé d'impression ou de couchage ou ils pourront être intégrés à la masse de celui- ci. L'intégration pourra se faire notamment sous forme .de fibres, poudres, fils, bandelettes de sécurité réalisés à partir desdits matériaux ou les contenant ou leur servant de support.These materials can be deposited on the surface of the paper by a printing or coating process or they can be integrated into the mass thereof. The integration may be done in particular in the form of fibers, powders, wires, safety strips made from said materials or containing them or serving as their support.
Les papiers contenant ces matériaux pourront être imprimés puis plastifiés sans que le moyen de reconnaissance puisse être remis en cause.The papers containing these materials can be printed and then laminated without the means of recognition being able to be called into question.
Avantageusement, le matériau magnétique est choisi parmi les matériaux suivants : FeRh, MnAs, Mn3 SbN, Mn3SnC, et (Mn1-xCrx)2 Sb. Ces matériaux cités en exemple sont du type à transition du premier ordre,et sont tout particulièrement avantageux pour des applications au papier de sécurité, car on sait que leur nombre très réduit et le caractère spécifique et exceptionnel de leur propriété rend impossible l'usage en subtitu- tion d'un matériau classique.Advantageously, the magnetic material is chosen from the following materials: FeRh, MnAs, Mn 3 S bN, Mn 3 SnC, and (Mn 1-x Cr x ) 2 Sb. These exemplary materials are of the first order transition type, and are particularly advantageous for applications in security paper, since it is known that their very small number and the specific and exceptional nature of their property makes it impossible to use them. substitution of a classic material.
En ce qui concerne les matériaux du type à transition du second ordre, on peut choisir avantageusement une ferrite zinc nickel (Zn1-xNix)Fe2O4 dont la température de Curie est 85°C pour x = 0,10, ou encore une ferrite zinc-cobalt (Zn1-x Cox Fe 2 0 4 dont la température de Curie est de 25°C pour x = 0,10 et 82°C pour x = 0,20, températures évidemment compatibles avec la tenue du papier.As regards materials of the second order transition type, it is advantageous to choose a zinc nickel ferrite (Zn 1-x Ni x ) Fe 2 O 4 whose Curie temperature is 85 ° C. for x = 0.10, or a zinc-cobalt ferrite (Zn 1-x Cox Fe 2 0 4 whose Curie temperature is 25 ° C for x = 0.10 and 82 ° C for x = 0.20, temperatures obviously compatible with the behavior paper.
1) Citons à titre d'exemple, l'utilisation d'un alliage de composition voisine de Fe Rh.1) Let us cite by way of example, the use of an alloy with a composition close to Fe Rh.
Ce matériau est antiferromagnétique à la température ambiante et devient ferromagnétique au-dessus de 52°C.This material is antiferromagnetic at room temperature and becomes ferromagnetic above 52 ° C.
Ce matériau émis sous forme de poudre dont les particules ont une taille de l'ordre du micron, est dispersé dans un vernis à raison de 10 g de produit pour 100 grammes de vernis.This material emitted in the form of a powder, the particles of which have a size of the order of a micron, is dispersed in a varnish at the rate of 10 g of product per 100 grams of varnish.
Le vernis est déposé sur un film de polyester (de 20 microns d'épaisseur) par un procédé d'impression héliographique, la quantité de vernis déposée est de l'ordre de 5 à 10 grammes par m2.The varnish is deposited on a polyester film (20 microns thick) by a heliographic printing process, the quantity of varnish deposited is of the order of 5 to 10 grams per m2.
Le film de polyester est ensuite découpé en bandelettes de 0,6 mm de large.The polyester film is then cut into strips 0.6 mm wide.
Ces bandelettes sont incorporées au papier au moment de sa fabrication.These strips are incorporated into the paper at the time of its manufacture.
2) Une application semblable peut être réalisée à partir de matériaux à transition du premier ordre, tels que SbMn3N dont la température de transition ferro-paramagnétique est de 88°C, ou SnMn3S dont la température de transition est de 17°C.2) A similar application can be made from first-order transition materials, such as SbMn 3 N whose ferro-paramagnetic transition temperature is 88 ° C, or SnMn 3 S whose transition temperature is 17 ° vs.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7930376A FR2471443A1 (en) | 1979-12-11 | 1979-12-11 | MEANS OF MARKING AND SECURITY PAPER APPLYING THIS MEANS |
| FR7930376 | 1979-12-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0030507A1 true EP0030507A1 (en) | 1981-06-17 |
| EP0030507B1 EP0030507B1 (en) | 1984-07-18 |
Family
ID=9232649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80401749A Expired EP0030507B1 (en) | 1979-12-11 | 1980-12-08 | Security paper using a means for marking and recognition |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0030507B1 (en) |
| JP (1) | JPS5698195A (en) |
| BR (1) | BR8008063A (en) |
| DE (1) | DE3068624D1 (en) |
| FR (1) | FR2471443A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR900100496A (en) * | 1989-06-27 | 1991-11-15 | Nat De Moneda Y Timbre Fab | Security map and method for fabricating it |
| EP0463647A1 (en) * | 1990-06-25 | 1992-01-02 | Fabrica Nacional De Moneda Y Timbre | Security paper and its manufacture procedure |
| FR2771111A1 (en) * | 1997-11-20 | 1999-05-21 | Arjo Wiggins Sa | Security document |
| CN101023147B (en) * | 2004-07-30 | 2010-05-12 | 独立行政法人理化学研究所 | Thermal expansion inhibitor, zero thermal expansion material, negative thermal expansion material, method for inhibiting thermal expansion, and method for producing thermal expansion inhibitor |
| US11643559B2 (en) | 2017-07-25 | 2023-05-09 | Magnomer, Inc. | Methods and compositions for magnetizable plastics |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2718624B2 (en) * | 1993-12-02 | 1998-02-25 | 日本発条株式会社 | Detected object whose authenticity is checked and method of manufacturing the same |
-
1979
- 1979-12-11 FR FR7930376A patent/FR2471443A1/en active Granted
-
1980
- 1980-12-08 DE DE8080401749T patent/DE3068624D1/en not_active Expired
- 1980-12-08 EP EP80401749A patent/EP0030507B1/en not_active Expired
- 1980-12-10 BR BR8008063A patent/BR8008063A/en unknown
- 1980-12-11 JP JP17392680A patent/JPS5698195A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| IEEE TRANSACTIONS ON MAGNETICS, volume Mag-11, no. 5, septembre 1975, NEW YOR K (US) A.E. BERKOWITZ et al. "Magnetic Tagging", pages 1576-1581 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GR900100496A (en) * | 1989-06-27 | 1991-11-15 | Nat De Moneda Y Timbre Fab | Security map and method for fabricating it |
| EP0463647A1 (en) * | 1990-06-25 | 1992-01-02 | Fabrica Nacional De Moneda Y Timbre | Security paper and its manufacture procedure |
| FR2771111A1 (en) * | 1997-11-20 | 1999-05-21 | Arjo Wiggins Sa | Security document |
| WO1999027185A1 (en) * | 1997-11-20 | 1999-06-03 | Arjo Wiggins S.A. | Security document comprising magnetic particles |
| EP1034536B1 (en) * | 1997-11-20 | 2002-06-19 | Arjo Wiggins | Data security medium |
| CN101023147B (en) * | 2004-07-30 | 2010-05-12 | 独立行政法人理化学研究所 | Thermal expansion inhibitor, zero thermal expansion material, negative thermal expansion material, method for inhibiting thermal expansion, and method for producing thermal expansion inhibitor |
| US11643559B2 (en) | 2017-07-25 | 2023-05-09 | Magnomer, Inc. | Methods and compositions for magnetizable plastics |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0030507B1 (en) | 1984-07-18 |
| FR2471443B1 (en) | 1984-03-09 |
| BR8008063A (en) | 1981-06-30 |
| FR2471443A1 (en) | 1981-06-19 |
| DE3068624D1 (en) | 1984-08-23 |
| JPS5698195A (en) | 1981-08-07 |
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