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
• • 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
  • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
  • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
  • D21H23/22—Addition to the formed paper
  • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
  • D21H23/42—Paper being at least partly surrounded by the material on both sides
  • D21H23/44—Treatment with a gas or vapour

Definitions

• the present invention relates to security or valuable documents. More specifically, the invention relates to a method making it possible to prepare extremely robust fiduciary documents, in order to preserve their qualities and their specificities (for example security elements associated with the document) and / or to extend their duration of use, by especially when these are subjected to an aggressive environment.
• markings associated with the documents are known, readable by an observer or by a machine. Such markings thus constitute a security element of the document.
• markings There are many types of marking that can be deposited on the surface of the document, or integrated into its internal structure, the marking having physical (optical, electrical, magnetic %), chemical, or any other nature (biological) properties. , ...) so as to allow its recognition
• the marking must remain legible, that is to say that it must neither be covered by dirt or other damage to the document which conceals it nor be itself altered.
• banknotes are handled and treated like ordinary objects, and are commonly damaged and soiled. Such degradations can compromise the reading of the various authentication markings that tickets may include or even make it impossible (in particular in the case of machine re-reading), this constitutes an important limitation of ticket security, and reduces their lifetime because it is necessary for many applications to be able to authenticate banknotes
• the object of the invention is to make it possible to produce a document comprising at least one authentication marking which constitutes a security element of the document, the authentication marking or marks being preserved from degradation and soiling so as to guarantee the security of the document
• the invention provides a security document comprising a support made of a sheet of paper with a fibrous weft, characterized in that the fibrous weft is impregnated over its entire thickness with a protective substance, so that said substance coats the fibers of the weft and covers the bonding areas of these fibers, the pores of said support being hermetically sealed by the coating
• the protective substance comprises an organic substance the organic substance is a silane, a fluorinated silane, a polymer of the -xylene type, or another polymer
• the protective substance includes an inorganic substance the inorganic substance is S ⁇ O 2 , S ⁇ 3 N 4 , T ⁇ O 2 , ZnO or
• the protective substance was deposited on the support in paper sheet by vacuum evaporation the protective substance was deposited on the support in paper sheet by decomposition of a plasma on the surface of the support the decomposition of the plasma takes place under a pressure close to that of vacuum the protective substance was deposited on the support in sheet of paper by chemical vapor deposition the protective substance was deposited on the support in sheet of paper by impregnation of the support by a solution of low viscosity then carrying out an annealing step allowing the solution to be frozen in the frame of the support
• a banknote is processed by first placing it in an evaporation chamber in which an extremely low pressure has been established which can be assimilated to that of the vacuum
• This ticket can be a fibrous weft paper ticket
• the bill is placed next to a crucible which contains a hydrophobic substance which can be
• organic silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
• inorganic Silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
• inorganic Silane, fluorinated silane, xylene-type polymer - for example parylene (registered trademark), other polymer
• inorganic S ⁇ O 2 , S ⁇ 3 N, or else T ⁇ O 2 , ZnO, SnO 2 for example
• type organic / inorganic hybrid mixturetures of S ⁇ 0 2 and fluorinated silanes, or other
• the crucible containing the substance is then heated, bringing it to a temperature which can be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase
• a temperature which can be of the order of 1000 degrees centigrade, so that the substance passes into the gas phase
• the pores of the ticket may not be blocked by the varnish, and the quality of protection is in this bad case
• the protective substance permeates the fibrous weft of the paper over its entire thickness, so that the fibers of this weft are coated with said substance, and the bonding zones between these fibers are also covered by this substance
• the pores of the ticket are hermetically sealed which considerably increases the quality of protection (in particular against humidity and particles carried by a humid atmosphere)
• the Applicant has in particular carried out tests of quantification of the development of the whiteness at the level of the watermark of banknotes, such consists of an accelerated aging of the note (exposure to water and to soiling). and in an optical determination of the whiteness of the paper
• the varnished ticket made it possible to obtain a gain of the order of a few tens percent compared to an untreated ticket, whereas in the case of a ticket processed according to the invention, the gain was of the order of a few hundred percent, typically corresponding to a tripling of the life of the ticket
• the bill is placed in a plasma chamber inside which a pressure close to that of vacuum has been established, the target being able to be made of metal, for example silicon, the plasma being able to consist of a mixture of Argon and Oxygen Bombed by oxygen ions, the target emits silicon particles which will combine on the surface of the banknote with oxygen ions to form I silicon oxide S ⁇ O 2 (this combination does not not realized in the absence of solid support)
• the ticket is also possible to coat the ticket by chemical vapor deposition (method known by the English term "chemical vapor deposition")
• chemical vapor deposition method known by the English term "chemical vapor deposition”
• the ticket is exposed to the substance in the vapor phase (which thus forms a gaseous precursor), the vapor condensing on contact with the ticket to form a deposit on the ticket
• This embodiment also makes it possible to obtain a very good impregnation of the ticket by coating the fibers and thus a blockage of the pores of the paper, the gaseous precursor being able to diffuse in all the free volumes and to condense on all the exposed surfaces.
• the various embodiments of the invention described above make it possible to deposit on the fibrous weft structure of the ticket a protective coating substance which completely closes the pores of the paper and thus constitutes an extremely effective barrier against humidity and soiling as the tests carried out by the Applicant have shown.
• a protective coating substance which completely closes the pores of the paper and thus constitutes an extremely effective barrier against humidity and soiling as the tests carried out by the Applicant have shown.
• such a coating makes it possible to considerably increase the mechanical robustness of the ticket.
• the substance coating must be thick enough to constitute an effective and durable barrier; in practice, the thickness equivalent to the quantity of material deposited (that is to say the thickness that would form the quantity of substance actually deposited on a perfectly flat and non-porous support) must be of the order of a few microns , for example from 0.2 to 30 microns.
• the substances used for coating the fibrous weft structure of the ticket are generally optically transparent, it is also possible to take advantage of the optical characteristics.

Landscapes

• Inspection Of Paper Currency And Valuable Securities (AREA)
• Paper (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Credit Cards Or The Like (AREA)
• Safety Valves (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Disintegrating Or Milling (AREA)
• Absorbent Articles And Supports Therefor (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9552950

Family Applications (1)

Country Status (11)

Families Citing this family (1)

Citations (3)

• 1999
  • 1999-12-07 FR FR9915386A patent/FR2801910B1/fr not_active Expired - Fee Related
• 2000
  • 2000-12-07 AT AT00988890T patent/ATE328154T1/de not_active IP Right Cessation
  • 2000-12-07 ES ES00988890T patent/ES2261269T3/es not_active Expired - Lifetime
  • 2000-12-07 OA OA1200200176A patent/OA12207A/fr unknown
  • 2000-12-07 AU AU25240/01A patent/AU2524001A/en not_active Abandoned
  • 2000-12-07 DE DE60028418T patent/DE60028418T2/de not_active Expired - Lifetime
  • 2000-12-07 MD MDA20020161A patent/MD3349B2/ro not_active IP Right Cessation
  • 2000-12-07 WO PCT/FR2000/003426 patent/WO2001042563A1/fr active IP Right Grant
  • 2000-12-07 EP EP00988890A patent/EP1250492B1/fr not_active Expired - Lifetime
• 2002
  • 2002-06-06 NO NO20022695A patent/NO20022695L/no not_active Application Discontinuation
  • 2002-06-06 MA MA26674A patent/MA25878A1/fr unknown

Patent Citations (3)

Also Published As

Similar Documents

Legal Events