EP1149709B1 - Security coating process of documents - Google Patents

Security coating process of documents Download PDF

Info

Publication number
EP1149709B1
EP1149709B1 EP01303870A EP01303870A EP1149709B1 EP 1149709 B1 EP1149709 B1 EP 1149709B1 EP 01303870 A EP01303870 A EP 01303870A EP 01303870 A EP01303870 A EP 01303870A EP 1149709 B1 EP1149709 B1 EP 1149709B1
Authority
EP
European Patent Office
Prior art keywords
coating
toner
printing
process according
toner image
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.)
Expired - Lifetime
Application number
EP01303870A
Other languages
German (de)
French (fr)
Other versions
EP1149709A3 (en
EP1149709A2 (en
Inventor
Paul Mann
Ivan Wells
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Security Printing and Systems Ltd
Original Assignee
Security Printing and Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Security Printing and Systems Ltd filed Critical Security Printing and Systems Ltd
Publication of EP1149709A2 publication Critical patent/EP1149709A2/en
Publication of EP1149709A3 publication Critical patent/EP1149709A3/en
Application granted granted Critical
Publication of EP1149709B1 publication Critical patent/EP1149709B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0054—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by thermal means, e.g. infrared radiation, heat

Definitions

  • This invention relates to improvements in toner bonding and security.
  • the first is the effect that variations in paper surface have on the bond, it has been shown that indentations i.e. watermarks and normal variation to surface characteristics of the paper can reduce the strength of the bond between the toner and the surface. This can result in the toner breaking off during the life of the document or in the extreme cases not bonding at all.
  • Documents with poor bonding or incomplete characters from this problem impact upon the detection of deliberate alterations, as the persons checking the document become use to seeing variations within the characters on genuine data and therefore becomes less able to determine what is altered.
  • the second problem is that, as the bond of the toner does not penetrate the surface of the paper it means that the bond can be broken by physical force alone and this may mean that the level of distribution to the surface of the substrate is low which means the detection by visual means is very difficult.
  • the third problem is due to the material used to produce the toner. Toner was never intended for use as a security feature and therefore the majority of common toners do not contain materials that lend themselves to detection by machine-readable techniques.
  • EP A 0839670 we propose a method of security coating of documents wherein a coating is applied to fused markings such as laser printed characters in order to protect the markings against wear and tampering.
  • US 5045426 proposes that before a document is laser printed, a carrier web should be prepared by application of an adhesion-enhancing composition to the web in at least selected places where the web is to be printed, and the application may be carried out by printing with a flexographic press, a process adopted for use in particulate with plastics webs. The web is then laser printed in the areas which have been so prepared but there is no teaching of providing a coating over the markings to protect these against wear or tampering, although adhesion to the web is improved by the pre-printing coating.
  • the object of this process is three-fold the first is to produce a surface that gives a stronger bond to toner than the surface of the paper.
  • the second is to add a security coating to selected areas of the document, that will improve the security of the toner allowing the integrity of the data below to be validated by machine reading techniques.
  • This process also allows the materials to be applied only where the toner-generated data may be applied, minimising the use of materials.
  • the invention provides a process for security coating of a document, characterised in that the process comprises the steps of first applying a pre-coating by printing a coating material onto selected areas of a substrate, printing with hot melt toner on the selected areas to provide a toner image and fusing the toner image, and applying an over-coating by printing a further coating material onto the toner image.
  • the process is for coating a secure bond for toner deposition images and the application of a secure coating and may comprise a selective coating applied to selective areas of the fused toner.
  • the coating applied on to the fused toner may be machine readable by the use of transmission and reflectance of any or a combination of visible light, Ultra violet light and/or infra red light.
  • the material applied to the surface of the substrate may be cured by the use of one or more external energy sources comprising any of IR, UV radiation, Electron beam or any other suitable energy source.
  • the coating applied on top of the toner may be cured by the use of one or more external energy sources comprising any of IR, UV radiation, Electron beam or any other suitable energy source.
  • the coating to the substrate is applied by using a printing process i.e. a lithographic process, a flexographic and Gravure process or any or any other printing process.
  • a printing process i.e. a lithographic process, a flexographic and Gravure process or any or any other printing process.
  • the coating applied on top of the toner is applied by using a printing process i.e. lithographic process, flexographic and Gravure process or any other printing process.
  • a separate coating may be applied to the substrate and a further coating then applied on top of the fused toner.
  • the first step in the process is preferably to print a coating onto the surface of the paper in at least the areas where the toner would be applied.
  • This coating is preferably applied on the top of any other printed designs.
  • the coating can be applied by a printing process such a lithographic, Gravure or flexographic or any other printing process.
  • the documents may then be processed in toner deposition system and the toner is then fused as normal within the machine.
  • the fused images are than preferably coated with a material over all or some of the toner generated marking.
  • the coating is applied by the flexographic lithographic printing process or Gravure or any other printing process.
  • the coating gives improved security against deliberate remove of toner by physical means and a method by which the area of toner generated data can be scanned using machine reading techniques.
  • the first process step is to print a coating on to the document to be laser (toner-deposition) printed in at least the areas where the toner is to be deposited on to the substrate. This is done using a printing process and the material is applied on top of any other printings on the document, in at least the areas onto which the toner is to be applied.
  • the second process is to laserprint the variable details onto the document. The toner is then fused in the standard way.
  • the document with the fused toner is then coated with a second layer using a printing process; the coating is used to cover at least the most sensitive toner generated data.
  • the document is then issued, once the document is used and returned for reconciliation it can be passed along a track with a reader that checks if the coating is till intact and therefore if the data safety has been compromised.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Cleaning In Electrography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Printing Methods (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Optical Communication System (AREA)
  • Laser Beam Printer (AREA)
  • Amplifiers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Paper (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A method of making a secure printed document comprises printing a first coating onto to selected areas of a substrate, laser printing a toner image onto the coated areas, fusing the toner image, and printing a second coating onto at least part of the toner image. The second coating is selected to allow the toner generated image to be scanned through the second coating using machine reading techniques.

Description

  • This invention relates to improvements in toner bonding and security.
  • It has long been recognised that toner deposition systems have a number of weaknesses that make them unsuitable for use with data that is vulnerable to alteration.
  • Two of these weaknesses are related to the way the toner is bonded to the surface of the paper and both affect the security of the document. A third is associated with the material composition of toner.
  • The first is the effect that variations in paper surface have on the bond, it has been shown that indentations i.e. watermarks and normal variation to surface characteristics of the paper can reduce the strength of the bond between the toner and the surface. This can result in the toner breaking off during the life of the document or in the extreme cases not bonding at all. Documents with poor bonding or incomplete characters from this problem impact upon the detection of deliberate alterations, as the persons checking the document become use to seeing variations within the characters on genuine data and therefore becomes less able to determine what is altered.
  • The second problem is that, as the bond of the toner does not penetrate the surface of the paper it means that the bond can be broken by physical force alone and this may mean that the level of distribution to the surface of the substrate is low which means the detection by visual means is very difficult. The third problem is due to the material used to produce the toner. Toner was never intended for use as a security feature and therefore the majority of common toners do not contain materials that lend themselves to detection by machine-readable techniques.
  • With the increasing demand for higher speeds in personalisation of security documents, the use of toner deposition systems has increased and this process has been developed to tackle these three major problems. It is a process that will give increased security to toner produced data and will introduce a method by which the integrity of the coating can be verified by machine-readable techniques.
  • In EP A 0839670 we propose a method of security coating of documents wherein a coating is applied to fused markings such as laser printed characters in order to protect the markings against wear and tampering.
  • US 5045426 proposes that before a document is laser printed, a carrier web should be prepared by application of an adhesion-enhancing composition to the web in at least selected places where the web is to be printed, and the application may be carried out by printing with a flexographic press, a process adopted for use in particulate with plastics webs. The web is then laser printed in the areas which have been so prepared but there is no teaching of providing a coating over the markings to protect these against wear or tampering, although adhesion to the web is improved by the pre-printing coating.
  • The object of this process is three-fold the first is to produce a surface that gives a stronger bond to toner than the surface of the paper. The second is to add a security coating to selected areas of the document, that will improve the security of the toner allowing the integrity of the data below to be validated by machine reading techniques. This process also allows the materials to be applied only where the toner-generated data may be applied, minimising the use of materials.
  • The invention provides a process for security coating of a document, characterised in that the process comprises the steps of first applying a pre-coating by printing a coating material onto selected areas of a substrate, printing with hot melt toner on the selected areas to provide a toner image and fusing the toner image, and applying an over-coating by printing a further coating material onto the toner image.
  • The process is for coating a secure bond for toner deposition images and the application of a secure coating and may comprise a selective coating applied to selective areas of the fused toner.
  • The coating applied on to the fused toner may be machine readable by the use of transmission and reflectance of any or a combination of visible light, Ultra violet light and/or infra red light.
  • The material applied to the surface of the substrate may be cured by the use of one or more external energy sources comprising any of IR, UV radiation, Electron beam or any other suitable energy source.
  • The coating applied on top of the toner may be cured by the use of one or more external energy sources comprising any of IR, UV radiation, Electron beam or any other suitable energy source.
  • The coating to the substrate is applied by using a printing process i.e. a lithographic process, a flexographic and Gravure process or any or any other printing process.
  • The coating applied on top of the toner is applied by using a printing process i.e. lithographic process, flexographic and Gravure process or any other printing process.
  • A separate coating may be applied to the substrate and a further coating then applied on top of the fused toner.
  • The first step in the process is preferably to print a coating onto the surface of the paper in at least the areas where the toner would be applied. This coating is preferably applied on the top of any other printed designs. The coating can be applied by a printing process such a lithographic, Gravure or flexographic or any other printing process. The documents may then be processed in toner deposition system and the toner is then fused as normal within the machine.
  • The fused images are than preferably coated with a material over all or some of the toner generated marking. The coating is applied by the flexographic lithographic printing process or Gravure or any other printing process.
  • With the use of this process the toner bonding variations that occur naturally on the surface of the paper can be reduced thus increasing the bonding of the toner to the paper. The coating gives improved security against deliberate remove of toner by physical means and a method by which the area of toner generated data can be scanned using machine reading techniques.
  • A process according to the invention will now be explained by way of an example.
    • Example Laser Printing
  • In accordance with the invention, the first process step is to print a coating on to the document to be laser (toner-deposition) printed in at least the areas where the toner is to be deposited on to the substrate. This is done using a printing process and the material is applied on top of any other printings on the document, in at least the areas onto which the toner is to be applied. The second process is to laserprint the variable details onto the document. The toner is then fused in the standard way.
  • The document with the fused toner is then coated with a second layer using a printing process; the coating is used to cover at least the most sensitive toner generated data. The document is then issued, once the document is used and returned for reconciliation it can be passed along a track with a reader that checks if the coating is till intact and therefore if the data safety has been compromised.

Claims (6)

  1. A process for security coating of a document, characterised in that the process comprises the steps of first applying a pre-coating by printing a coating material onto selected areas of a substrate, printing with hot melt toner on the selected areas to provide a toner image and fusing the toner image, and applying an over-coating by printing a further coating material onto the toner image.
  2. A process according to claim 1 wherein said over-coating includes one or more materials which allow the integrity of the coating to be verified by machine-reading techniques.
  3. A process according to claim 2 wherein said over-coating may be machine readable by transmission and reflectance of any one or a combination of visible, ultra-violet or infrared light.
  4. A process according to any preceding claim wherein said pre-coating is cured by use of one or more external energy sources.
  5. A process according to any preceding claim wherein said over-coating is cured by use of one or more external energy sources.
  6. A process according to claim 4 or 5 where said respective one or more external energy sources comprise one or more of infrared, ultra violet or electron beam emitting devices.
EP01303870A 2000-04-27 2001-04-27 Security coating process of documents Expired - Lifetime EP1149709B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0010146.9A GB0010146D0 (en) 2000-04-27 2000-04-27 Improvements in toner bonding security
GB0010146 2000-04-27

Publications (3)

Publication Number Publication Date
EP1149709A2 EP1149709A2 (en) 2001-10-31
EP1149709A3 EP1149709A3 (en) 2004-04-14
EP1149709B1 true EP1149709B1 (en) 2006-07-05

Family

ID=9890530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01303870A Expired - Lifetime EP1149709B1 (en) 2000-04-27 2001-04-27 Security coating process of documents

Country Status (7)

Country Link
EP (1) EP1149709B1 (en)
AT (1) ATE332520T1 (en)
DE (1) DE60121246T2 (en)
DK (1) DK1149709T3 (en)
ES (1) ES2267681T3 (en)
GB (1) GB0010146D0 (en)
PT (1) PT1149709E (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5045426A (en) * 1989-06-21 1991-09-03 The Standard Register Company Toner adhesion-enhancing coating for security documents
GB9622747D0 (en) * 1996-11-01 1997-01-08 Stationery Office The Ltd Security marking of documents
EP0885753A1 (en) * 1997-06-17 1998-12-23 Gelderse Papiergroep N.V. Security paper

Also Published As

Publication number Publication date
ATE332520T1 (en) 2006-07-15
ES2267681T3 (en) 2007-03-16
DK1149709T3 (en) 2006-11-06
DE60121246D1 (en) 2006-08-17
EP1149709A3 (en) 2004-04-14
DE60121246T2 (en) 2007-12-06
PT1149709E (en) 2006-11-30
GB0010146D0 (en) 2000-06-14
EP1149709A2 (en) 2001-10-31

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