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
• • 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
  • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
  • B42D25/29—Securities; Bank notes

Definitions

• the present invention relates generally to measurements can be taken to mark security documents such as banknotes, in an emergency context.
• the invention thus finds a particularly advantageous application in the emergency marking of security documents during a aggression, so as to invalidate the documents, and / or to then allow recognition of documents stolen during the attack.
• the object of the invention is thus a method of securing documents, including the steps of integrating into each documents a safety sign during its production, said safety sign can be altered by revealing means, said revealing means being intended to be used to alter in an emergency the characteristics of the safety sign.
• a second type of known process consists in triggering in the event means of burning documents.
• Such means may for example include means of triggering of an explosion.
• a first drawback of this second type of process is that it generates smoke that could annoy people in the vicinity proximity during the explosion and subsequent combustion.
• combustion does indeed invalidate a certain number of documents, it does not allow them to be marked so specific, which can however be searched to identify a document stolen in special circumstances.
• a third type of known process consists in smearing tickets automatically with ink in case of assault.
• the attackers can in any event develop "deinking" products whose role is to erase ink used to mark documents.
• This document discloses specific means for spraying by marking ink a set of security documents.
• the ink is used as a developer of a invisible sign which was integrated into the documents during their manufacture.
• thermosensitive printing sheet comprising microcapsules pressure sensitive, used as a safety feature.
• the object of the invention is to meet this need.
• the invention proposes, according to a first aspect a method for securing documents, comprising the steps consisting in integrating in each document a security sign during its manufacturing, said safety sign being able to be altered by means developers, said developer means being intended to be used to alter the characteristics of the safety sign in an emergency, characterized in that the method also includes association with security sign, during the production of the document, of an active element capable to convert some of the electromagnetic radiation from heat trigger to visibly alter the appearance of the document, and the implementation of the revealing means is triggered by electromagnetic triggering radiation.
• the invention also provides a device emergency marking of security documents, including means of implementing revealing means in a process such as mentioned above, characterized in that said means for setting artwork include microwave emission means.
• the invention finally proposes the application of a process as mentioned above for securing paper documents or plastic.
• the method according to the invention comprises the steps consisting in integrating in each document a security sign during its manufacturing, said safety sign being able to be altered by means developers, said developer means being intended to be used to alter the characteristics of the safety sign in an emergency.
• the active element which is integrated in each document, in association with the safety sign, receives the radiation of microwave trigger even if the document is at the heart of a bundle.
• microwave radiation does not meet difficulty entering the core of bundles, unlike an ink that would widespread.
• the device for implementing such a method may include a enclosure in which the bundles of documents are placed, a source microwave radiation being provided in the enclosure.
• the safety sign can be made so as to be imperceptible when it has not been activated by the active element, following exposure of the document with trigger radiation.
• the sign of security and the active element are combined and constitute only one entity.
• This entity (which we will simply designate in this first variant by the term "active element") can be any product capable of converting a part of the electromagnetic radiation triggering heat in view to visibly alter the appearance of the document.
• the alteration of the appearance of the document can thus consist of a evolution of the color of the safety sign produced in the form of a polymer, following heating: the polymer can indeed be chosen to change color, or become visible, under the effect of heat.
• a polymer invisible at room temperature can thus under the effect of microwave radiation generate heat, which causes itself the alteration of the optical properties of the polymer, so as to reveal a sign, such as a reason that the document has been Fly.
• the polymer can also be chosen to promote an effect of pathway (creation of a conductive carbon film), as a result of the rise in temperature caused by the heating of the polymer.
• composition of polymer can be adapted, for example by choosing a compound to melanin base.
• the active element and the security sign are distinct.
• the metal is not directly sensitive to radiation; it only plays the role of the safety sign.
• the metal can in this case be associated with the active element by embedding the metal in a varnish containing the active element, or by alloy, or by any other technique.
• the active element comprises capsules able to release a revealing product when exposed to electromagnetic triggering radiation.
• the capsules can thus comprise a polymer coating or in any product capable of both sealingly containing the product developer at room temperature, and to release this product from a certain heating temperature.
• the overheating results here again from exposure to the radiation of trigger: it can be caused by the revealing product which is inside the capsules, and / or by the coating of the capsules itself.
• the developer - which can be integrated, for example in ink - is the security sign.
• the revealing product can be a dye capable of sublimating under the effect exposure to heat, to go directly into the gas phase.
• composition of such an ink can be adapted by incorporating fatty additives (which are sensitive to sublimable dyes, and which allow to reveal them during their sublimation to change the appearance of the document), and / or by choosing the properties of the ink base (inks with UV drying or drying by the action of an electron beam).
• fatty additives which are sensitive to sublimable dyes, and which allow to reveal them during their sublimation to change the appearance of the document
• the specific properties of the active element may arise from the very nature of the active element, and thus exist at individual level of each active element particle.
• the properties of the active element and / or the product revealing are actually those of the particulate set formed by the active element particles and the host medium.
• the invention makes it possible to trigger particularly efficient marking of documents, even if they are at the heart of a bundle.
• the safety signs will be advantageously distributed in several places on the surface of the document. This guarantees that, in the event of a trip, different areas of the document are altered.
• Documents that can be protected in this way can be made from sheets of paper.

Landscapes

• Accounting & Taxation (AREA)
• Finance (AREA)
• Business, Economics & Management (AREA)
• Credit Cards Or The Like (AREA)
• Document Processing Apparatus (AREA)
• Inspection Of Paper Currency And Valuable Securities (AREA)
• Printing Methods (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Treatment Of Water By Ion Exchange (AREA)
• Data Exchanges In Wide-Area Networks (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)
• Polymerisation Methods In General (AREA)
• Developing Agents For Electrophotography (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (5)

Cited By (7)

Families Citing this family (7)

Citations (3)

• 2001
  • 2001-07-18 FR FR0109606A patent/FR2827618B1/fr not_active Expired - Fee Related
• 2002
  • 2002-07-17 DE DE60221755T patent/DE60221755T2/de not_active Expired - Lifetime
  • 2002-07-17 EP EP02291798A patent/EP1277881B1/de not_active Expired - Lifetime
  • 2002-07-17 ES ES02291798T patent/ES2290259T3/es not_active Expired - Lifetime
  • 2002-07-17 AT AT02291798T patent/ATE370272T1/de not_active IP Right Cessation

Patent Citations (3)

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