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
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
  • C21D6/04—Hardening by cooling below 0 degrees Celsius

Definitions

• the present invention indicates the security paper and value documents which incorporate a thread or a security mark, to the manufactured documents with this paper and to the procedure for the manufacture as much of thread or mark as the paper, according to the method which describes.
• the security threads have some physical characteristics and they introduce in the paper during the phase of the leaf formation in the method that they remain surrounded by cellulosic fibres. Any intention to extract them from the paper mass, results in paper breakage produced the document manipulation, that it can be invalited when we leave it incomplete.
• the security thread presence is, together with another security element, a waranty near the document authenticity, because it authenticates the origin and the paper origin legitim, used in the document printing.
• the falsifiers have employed different mediums to give the authentic appearance to document without security thread, being that it is necessary to improve of the original invention.
• the thread recognition had been seeked to facilitate through the inclusion of microsheets texts in the plastic film which cuts the threads, and which they make some allusion for example to the emitting country to the document nominal value or to the date emission and must be easy to recognize and read with help of a small magnifying glass of through the inclusion of luminiscent pigments (Fluorescent to the ultraviolet light, with colour change or no to the day light) which are easyly detectable with help of a bulb of pocket ultraviolet light with this way in the commerce, a false document presence can be controlled.
• luminiscent pigments Fluorescent to the ultraviolet light, with colour change or no to the day light
• the first case it can be clasified a big number of possible more or less simple.
• the most sophisticated include the type which be employed by the impregnator technic or to lac the film, which give the security to the thread after cutting it, with a material with a composition of strange earth, which emits in determined condition of luminous exitation an infrared radiation of intensity, easy to measure in one narrow band of specter.
• the development would be improved, including the incorporation of masked substance which must be added to the fibrous paste with the paper, must be manufactured, with which the specter band will be restricted, in which is possible to observe infrared mission to which are property of material formed with the strange earth.
• the same product class can be employed in form of ink, if good in this case no to contribute to guarantee the legitimate source of the security paper and make that the resultant document must have the protection against the falsified less efec- tive.
• the object of the present invention is to develop a security thread and the paper and the documents produced which include them, must be susceptible to include informations for its detection and identifications through automatic machines, with vanguard technology to difficult the falsifications through individual falsifiers (more difficult to detect than the types which produce with technic more complicated which give origin to a great necessity of equipment of side the falsifiers) able to substitutes and improves the existing systems in which to indicate a protection against the falsification more simple to the sensor effective and to a lesser cost.
• the developement must be based in special metalic material whose technology to describe as a continuation.
• Material foundation it is an alloy of magnetic metalic material (Fe/Co, Ni/B, Ni/P) which suffers a thermish treatment and consists of a strong cooling from initial temperature between 800 and 1500o C. Preferably 1000o to 1250o C, to a final temperature between -180o and -225o C preferential -190 0 to -215o C giving a solide amorphous without the normal metalic cristalline structure.
• the solid can be obtained in form of very fine band, as a tape with a rectangular section similar to the actual security threads with a minimum thickness of 10 microns and depends of the alloy or good in form of thread of circular section, changing for them the cooling system of metalic after the fusion phase, the minimum diameter which can be obtained in that time is about 5 microns.
• Thermic treatment consists in essence in two coils, one emisor who creates a perfect sinusoidal to avoid any influence of the materials in the armonics and a receptor.
• Another alternative for the invention object to the present patent is the repair of the material in solide particle form, with which there is possibility to manufacture on lac or ink to incorporate to the plastic film (with which the threads will be made) or only some simple inks of printing to applicate to the paper.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Paper (AREA)
• Credit Cards Or The Like (AREA)

Applications Claiming Priority (4)

Publications (1)

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Cited By (5)

Citations (4)

• 1991
  • 1991-01-08 EP EP91200019A patent/EP0463647A1/fr not_active Ceased

Patent Citations (4)

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