WO2019116079A1 - Mentions de sécurité à degrés de brillance différenciés - Google Patents

Mentions de sécurité à degrés de brillance différenciés Download PDF

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Publication number
WO2019116079A1
WO2019116079A1 PCT/IB2017/057903 IB2017057903W WO2019116079A1 WO 2019116079 A1 WO2019116079 A1 WO 2019116079A1 IB 2017057903 W IB2017057903 W IB 2017057903W WO 2019116079 A1 WO2019116079 A1 WO 2019116079A1
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WO
WIPO (PCT)
Prior art keywords
pattern
portions
printing
substrate
light
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.)
Ceased
Application number
PCT/IB2017/057903
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English (en)
Inventor
Mark MIZEN
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.)
Assa Abloy AB
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Assa Abloy AB
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 Assa Abloy AB filed Critical Assa Abloy AB
Priority to PCT/IB2017/057903 priority Critical patent/WO2019116079A1/fr
Publication of WO2019116079A1 publication Critical patent/WO2019116079A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • 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
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery

Definitions

  • Credentials include identification cards, driver’s licenses, passports, and other documents. Such credentials are formed from credential or card substrates including paper substrates, plastic substrates, cards, and other materials. Such credentials generally include printed information, such as a photo, account numbers, identification numbers, and other personal information. Credentials can also include data that is encoded in a smartcard chip, a magnetic stripe, or a barcode, for example.
  • Credential production devices include processing devices that process credential substrates by performing at least one processing step in forming a final credential product. Such processes generally include a printing process, a laminating or transfer process, a data reading process, a data writing process, and/or other process used to form the desired credential.
  • Embodiments of the present disclosure are directed to methods of printing a security mark on a substrate using at least one inkjet print head.
  • first and second patterns are printed on a surface of the substrate using the at least one print head. Portions of the first pattern are exposed to ultraviolet (UV) light within a first time period after printing the portions of the first pattern. Portions of the second pattern are exposed to UV light within a second time period after printing the portions of the second pattern.
  • UV ultraviolet
  • the first and second time periods are controlled to form a gloss level in the first pattern that is different from a gloss level in the second pattern.
  • a first pattern is printed on a surface of the substrate using the at least one print head. Portions of the first pattern are exposed to UV light within a first time period after printing the portions of the first pattern.
  • a second pattern is printed on the surface of the substrate using the at least one print head, and portions of the second pattern are exposed to UV light within a second time period after printing the second pattern. The second time period is longer than the first time period, the first pattern is different from the second pattern, and the first pattern has a different gloss level than the second pattern.
  • FIG. 1 is a simplified block diagram of an exemplary printing device, in accordance with embodiments of the present disclosure.
  • FIG. 2 is a simplified top view of a substrate and exemplary print heads shown in phantom lines.
  • FIG. 3 is a simplified side view of a printing operation being performed on a surface of a substrate using an ink jet print head, in accordance with exemplary embodiments of the present disclosure.
  • FIG. 4 is a chart illustrating gloss levels of a printed portion relative to a period of time between printing the portion and exposing the portion to UV light.
  • FIG. 5 is a flowchart illustrating a method of printing a security mark on a substrate using an ink jet print head, in accordance with embodiments of the present disclosure.
  • FIGS. 6A-C respectively are simplified top views of an exemplary first, second and composite patterns, in accordance with embodiments of the present disclosure.
  • FIG. 7 is a simplified side view of an exemplary system for measuring gloss levels. DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
  • FIG. 1 is a simplified block diagram of an exemplary printing device 100, in accordance with embodiments of the present disclosure.
  • the device 100 includes a controller 102 representing one or more processors that are configured to execute program instructions stored in a computer-readable media or memory of the device 100 or in another location.
  • Any suitable patent subject matter eligible computer readable media or memory may be utilized including, for example, hard disks, CD-ROMs, optical storage devices, flash memory, magnetic storage devices, or other suitable computer readable media or memory.
  • Such computer readable media or memory do not include transitory waves or signals.
  • the execution of the instructions by the controller 102 controls components of the device 100 to perform functions and method steps described herein.
  • the device 100 includes one or more print units 104, each of which is configured to print an image to a substrate.
  • the controller 102 receives a print job 106, which defines an image to be printed to the substrate.
  • the controller 102 controls the print unit 104 and other components of the device 100 based on the print job 106 to print the image to the substrate in accordance with conventional techniques.
  • the substrate to which the print unit 104 prints the image may take on various forms depending on the printing process that is performed by the device 100.
  • the print unit 104 is configured to directly print an image to a substrate, such as substrate 108 supported on a platen roller 109, to form the final printed product, as generally illustrated in FIG. 1.
  • the substrate 108 may take the form of any suitable substrate that is to form the final printed product, such as a paper substrate or a card substrate, for example.
  • the device 100 is a credential production device configured to produce a credential product, such as identification cards, membership cards, proximity cards, driver’s licenses, passports, credit and debit cards, and other credentials or similar products.
  • a credential product such as identification cards, membership cards, proximity cards, driver’s licenses, passports, credit and debit cards, and other credentials or similar products.
  • the substrate 108 may take the form of a credential substrate that is processed by the device 100 to form the credential product.
  • the term“credential substrate” includes substrates used to form credentials, such as card substrates. Exemplary card substrates include paper substrates other than traditional paper sheets used in copiers or paper sheet printers, plastic substrates, rigid and semi-rigid card substrates, and other similar substrates.
  • the device 100 includes a processing path 110 and a transport mechanism 112.
  • the transport mechanism 112 is configured to feed individual substrates 108 along the processing path for processing.
  • the device 100 may include a substrate supply 114, from which individual substrates 108 may be fed along the path 110 by the transport mechanism 112.
  • the transport mechanism 112 may include one or more motorized feed rollers or feed roller pairs 116, or other suitable mechanisms. Sensors may be used to assist the controller 102 in controlling the feeding of the substrates 108 along the processing path 104 using the transport mechanism 112.
  • the device 100 may also include one or more processing devices 120 that may be useful in forming the final printed product, such as a credential. These include, for example, a substrate rotator 120 A that is configured to rotate the substrate 108, a laminating unit 120B that can be used to apply a laminate to the substrate 108, a data encoder 120C that is configured to read and/or write data to memory of the substrate 108, and a magnetic stripe reader/writer 120D.
  • the device 100 may also include other conventional substrate processing devices.
  • Each print unit 104 may include one or more ink jet print heads 130.
  • Each of the print heads 130 includes a plurality of nozzles 132, each of which is configured to discharge an ink consumable, represented by arrow 134, in accordance with conventional ink jet printing processes.
  • One or more ink supplies (e.g., cartridges) 136 such as ink supplies 136A- C, may be connected to the print head 130 for discharge through the nozzles 132 during a printing operation.
  • the ink supplies 136 may contain colored inks, black ink, and/or a clear ink.
  • the clear ink is substantially transparent and is generally applied over an image printed using black or colored inks to provide protection to the image.
  • the device 100 includes one or more ultraviolet (UV) light sources 138, and each of the inks contained in the supplies 136 is curable through exposure to the UV light 140 discharged from the sources 138.
  • UV-curable inks that are suitable for use by the print head 130 include.
  • Each of the UV light sources 138 may include one or more conventional UV light-emitting diodes or other suitable UV light sources.
  • the print head 130 may move relative to the substrate 108. This movement includes movement of the print head 130 relative to the substrate 108 along the processing path 110, such as axis 142, as indicated in FIG. 2, which is a simplified top view of the substrate 108 with exemplary print heads 130A and 130B shown in phantom lines.
  • the print head 130 is also configured to move along an axis 144 that is perpendicular to the processing path 110 and the axis 142 relative to the substrate 108, as indicated in FIG. 2.
  • the nozzles 132 of the print head 130A may be positioned to print image lines across the surface 146 of the substrate 108 without having to move the print head 130A along the axis 144.
  • printing operations can be performed on the surface 146 of the substrate 108 using the print head 130A without moving the print head 130A relative to the substrate 108 along the axis 144.
  • the print head 130B does not extend across the entire width of the substrate 108, such as indicated by exemplary print head 130B, it is necessary to move the print head 130B along both the axis 142 and the axis 144 relative to the substrate 108 during a printing operation in order to print an image over substantially the entire surface 146 of the substrate 108.
  • the device 100 includes a gantry 148 that is configured to facilitate movement of the print head 130 relative to the substrate 108 during a printing operation.
  • the gantry 148 may take on any suitable form, and may utilize conventional mechanisms (e.g., print head carriage on rails, etc.) for moving the print head 130 along the axis 142 and/or 144 relative to the substrate 108 during a printing operation.
  • the gantry 148 may be used to move the print head 130 along the axis 142 and the axis 144 relative to the substrate 108, while the substrate 108 remains in a fixed position along the processing path 110 and axis 142, to allow the print head 130 to print an image over substantially the entire surface 146 of the substrate.
  • the print head 130 may have a fixed position along the processing path 110 and the axis 142.
  • the transport mechanism 112 may be used to move the substrate 108 along the processing path 110 and the axis 142 relative to the print head 130, while the gantry 148 may be used to move the print head 130 along the axis 144 relative to the substrate 108, to allow the print head 130 to print an image over the length of the substrate 108 (e.g., along the axis 142).
  • FIG. 3 is a simplified side view of a printing operation being performed on a surface 146 of a substrate 108 using the print head 130, in accordance with exemplary embodiments of the present disclosure.
  • ink 134 is discharged from the one or more nozzles 132 of the print head 130 as the print head 130 moves relative to the substrate 108 along the axes 142 and/or 144, to form a pattern or image 150 of the ink 134 on the surface 146, as generally illustrated in FIG. 3.
  • individual lines or portions 152 i.e., print lines oriented with the axis 144) of the pattern 150 are sequentially printed through the application of the ink 134 to the surface 146 by the print head 130, as the print head 130 moves along the axis 142 or processing path 110 relative to the substrate 108, to form the image or pattern 150 over the length of the substrate 108.
  • the printed pattern 150 or portions 152 are then exposed to UV light 140 from the one or more UV sources 138 to fully or partially cure them on the surface 146 of the substrate 108. This generally involves movement of the one or more UV sources 138 relative to the substrate 108.
  • the device 100 includes one or more UV sources 138 that do not move with movement of the print head 130 relative to the processing path 110, such as indicated by UV source 138A in FIG. 3.
  • the UV source 138A may include a suitable gantry 154 that is configured to move the UV source 138A relative to the substrate 108, or the UV source 138A may have a fixed position along the processing path, and the transport mechanism 112 may be used to move the substrate 108 relative to the UV source 138A, as generally indicated in FIG. 1.
  • the device 100 includes one or more UV sources 138 that move with movement of the print head 130 relative to the substrate 108, such as along the axis 142 and/or the axis 144, as indicated by UV source 138B shown in FIG. 3.
  • the UV source 138B exposes the pattern 150 to the UV light 140B after the pattern 150 or portions 152 thereof, have been printed to the surface 146 using the print head 130.
  • the print head 130 may apply ink 134 to the surface 146 of the substrate 108 during movement of the print head 130 in a direction 156 along the axis 142 relative to the substrate 108 to sequentially print a series of portions 152 and form the pattern or image 150 on the surface 146.
  • the printed pattern 150 may then be exposed to the UV light 140 A from the UV source 138 A by moving the substrate 108 relative to the UV source 138A along the processing path 110, and/or by moving the UV source 138B relative to the substrate 108 using the gantry 148.
  • the print head 130 may print the pattern 150 to the substrate 108 as the print head 130 moves in the direction 156 along the axis 142, then the pattern 150 on the surface 146 of the substrate 108 may be exposed to the UV light 140B by moving the print head 130 in a direction 158 along the axis 142 relative to the substrate 108, for example.
  • the print head 130 may print the portions 152 to the surface 146 while moving in the direction 156 relative to the substrate.
  • the UV source 138B located on a trailing side of the print head 130 may expose the printed portions 152 to UV light 140B, as shown in FIG. 3.
  • the printed portions 152 may be exposed to UV light during the same pass of the print head 130 over the substrate 108.
  • the device 100 may include multiple print units 104 and print heads 130. Each of the print units 104 or print heads 130 may be used to print a different image or pattern 150 to the substrate 108. This can provide faster processing of the substrate 108.
  • Embodiments of the present disclosure are directed to printing techniques that may be performed using the print unit 104 to generate visually distinguishable gloss levels within a printed image. These printing techniques may be performed in a direct printing process, such as shown in FIG. 1.
  • This flattening of the ink pixels over time corresponds to a changing gloss level of the printed portions 152.
  • the portions 152 when printed portions 152 are exposed to UV light 140 within a time period ti after printing the portions 152, the portions 152 will generally have a matte or low-gloss level, when the portions 152 are exposed to UV light after the time period ti, but before the expiration of time t 2 , the portions 152 will generally have a semi-gloss level, and when the printed portions 152 are exposed to UV light after the time t 2 , the portions 152 will generally have a high-gloss level, as indicated in FIG. 4.
  • the times ti and t 2 will depend upon the formulation of the UV-curable ink that is used to print the portions 152.
  • the times ti and t 2 increase with increasing viscosity of the UV-curable ink used to print the portions 152. It is understood, that the change in gloss level over time from the printing of the portions 152 is gradual, and thus, the chart of FIG. 4 is simplified to illustrate general gloss level regions rather than definite boundaries for the gloss levels.
  • the time ti is in the range of less than about 200 ms, such as less than 100 ms, and the time t 2 is greater than approximately 300 ms, such as greater than 500 ms.
  • Embodiments of the present disclosure make use of the time-varying gloss level of printed portions 152 to provide printed patterns 150 on the substrate 108 having different gloss levels by exposing the portions 152 to UV light 140 at varying times after they have been printed.
  • the composite image formed by the printed patterns 150 having different gloss levels on the substrate 108 can be used as a security mark for authenticating the printed composite image or the product on which the composite image has been printed.
  • the exposure of a printed portion 152 to UV light 140 means that the printed portion 152 is exposed to at least a threshold dosage (i.e., total UV irradiance) of UV light 140 using the one or more UV light sources 138, which causes the portion 152 to initiate a photochemical reaction that generates a crosslinked network of polymers, and substantially prevents further flattening of the ink forming the portion 152 on the surface 146 of the substrate 108.
  • the exposure of the printed portions 152 to the UV light 140 causes the portions 152 to become“pinned” in their current state on the surface 146 of the substrate 108 and locks in the gloss level of the printed portion 152. Accordingly, the gloss level of printed portions 152 may be fixed without fully curing the portions 152. If necessary, the printed portions 152 may be exposed to additional dosages of the UV light 140 from the one or more sources 138 to complete the curing of the printed portions 152.
  • FIG. 5 is a flowchart illustrating a method of printing a security mark on a substrate using an ink jet print head, in accordance with embodiments of the present disclosure.
  • first and second patterns 150 are printed on a surface 146 of the substrate 108.
  • Simplified top views of exemplary first and second patterns 150A and 150B are shown in FIGS. 6A and 6B, with a substrate 108 shown in phantom lines.
  • the exemplary first pattern 150A includes printed areas 164, each of which is formed by multiple printed portions or print lines 152A, as shown in FIG. 6A.
  • the exemplary print pattern 150B includes a print area 166 that comprises multiple print portions or printed lines 152B, as shown in FIG. 6B.
  • the patterns 150A and 150B do not substantially overlap (i.e., less than 15% of the pattern 150A overlaps the pattern 150B).
  • the pattern 150A corresponds to portions of the substrate 108 that are generally not covered by the pattern 150B, resulting in the pattern 150A being essentially the inverse of the pattern 150B.
  • the combination of the printed patterns 150A and 150B form a composite pattern or image 150C on the surface 146 of the substrate 108, as shown in FIG. 6C.
  • the composite pattern 150C formed by the combination of the printed patterns 150A and 150B substantially covers the surface 146 (i.e., covers 90%) of the substrate 108, as shown in FIG. 6C.
  • An edge portion 168 of the surface 146 of the substrate 108 may not be covered by the composite image 150C due to limitations in the ability of the print unit 104 to print to the edges of the substrate 108.
  • the patterns 150A and 150B are printed during separate printing operations. That is, the print head 130 may print the portions or lines 152A of the pattern 150A during a pass of the print head 130 over the surface 146 of the substrate 108 (FIG. 3), and the print head 130 may print the portions or lines 152B of the pattern 150B during a different pass of the print head 130 over the surface 146 of the substrate 108. Alternatively, as mentioned above, different print heads 130 may be used to print the patterns 152A and 152B.
  • the pattern 150A is printed on the surface 146 of the substrate 108 before printing the pattern 150B on the surface 146.
  • the pattern 150B may be printed on the surface 146 before printing the pattern 150A.
  • the same or different UV-curable inks 134 may be used to print the patterns 150A and 150B. Additionally, the UV-curable ink or inks 134 used to form the printed patterns 150A and 150B may be a colored ink or a clear ink.
  • the printed patterns 150A and 150B are both formed using a UV-clear ink 134.
  • the patterns 150A and 150B of the clear ink may be printed over a previously printed image on the surface 146 of the substrate 108 to provide protection to the image.
  • portions 152A of the first pattern 150A are exposed to UV light 140 within a first time period after printing the portions 152A, and portions 152B of the second pattern 150B are exposed to UV light 140 within a second time period after printing the portions 152B, using the one or more UV light sources 138.
  • the first and second time periods are controlled to form a gloss level in the first pattern 150 A that is different from the gloss level in the second pattern 150B. In some embodiments, the gloss level of the printed pattern 150A is lower than the gloss level of the printed pattern 150B.
  • the difference in the gloss levels between the patterns 150A and 150B is visibly discernable by a human viewing the composite image 150C from an angle relative to the normal of the surface 146, such as at 20°, 65° and/or 85° relative to the normal of the surface 146, for example.
  • the pattern 150A has a substantially matte or low-gloss level, while the pattern 150B has substantially a high- gloss level.
  • the portions 152A of the pattern 150 A may be exposed to the UV light within a first time period from printing the portions 152A to the surface 146 of the substrate 108, such as a time period that is shorter than or equal to the time period ti (FIG. 4), while the portions 152B of the pattern 150B are exposed to the UV light 140 in step 172 within a second time period after printing the portions 152B that is longer than the first time period, such as a time period that is equal to or longer than the time period t 2 (FIG. 4).
  • the first time period is less than 200 ms, such as less than 100 ms
  • the second time period is greater than 300 ms, such as greater than 500 ms.
  • the gloss level of the printed patterns 150 A and 150B may also be measured using any suitable technique to determine the differential gloss level between the printed patterns 150A and 150B.
  • One exemplary system 180 for measuring the gloss level of a printed image on a surface 146 of a substrate 108 is shown in the simplified side view of FIG. 7.
  • the system 180 includes a light emitter, which is generally referred to as 182, and a light detector, which is generally referred to as 184. Pairs of the emitter 182 and the detector 184 are each oriented at an angle, which is generally referred to as 186, relative to the normal 188 to the surface 146 of the substrate 108.
  • the emitter 182 outputs a light signal, which is generally referred to as 190, having a known intensity.
  • the light signal 190 is reflected from the surface 146 toward the corresponding detector 184 as reflected light, which is generally referred to as 192.
  • the level or intensity of the reflected light 192 detected by the detector 184 indicates the gloss level or reflectance of the surface 146.
  • the system 180 allows for gloss level measurements at different angles 186, such as standard gloss level measurement angles 186 of 20°, 65° and 85°.
  • the gloss level of the portions 152 A and 152B may each be measured using an emitter 182A and a detector 184A that are oriented at a relatively shallow angle 186A (e.g., 20°), an emitter 182B and a detector 184B oriented at a relatively moderate angle 186B (e.g., 60°), or an emitter 182C and a detector 184C that are oriented at a relatively large angle 186C (e.g., 85°), as shown in FIG. 7.
  • the printed pattern 150A has a gloss level that is lower than the gloss level of the printed pattern 150B, when measured using the system 180 or a similar system, at angles of 20°, 65°, and/or 85°.
  • the first pattern 150A is printed in step 160 and exposed to UV light in step 170 before printing the second pattern 150B.
  • the exposure of the first pattern 150A to UV light in step 170 includes exposing the portions 152A to a low dosage of UV light 140, which pins the portions 152A and the pattern 150A to the surface 146A, but does not fully cure the portions 152A.
  • the second pattern 150B is printed in step 160 and exposed to a second dosage of UV light in step 172.
  • the first printed pattern 150A is also exposed to the second dosage of UV light during step 172.
  • the second dosage of UV light is greater than the first dosage of UV light, and is sufficient to fully cure the printed first and second patterns 150 A and 150B on the surface 146 of the substrate 108.
  • the same or different UV light sources 138 may be used to expose the portions 152A of the pattern 150A during step 170, and the portions 152B of the pattern 150B during step 172.
  • the portions 152A or pattern 150A may be exposed to UV light during step 170 from a UV light source 138 that is attached to the print head 130 used to print the portions 152A, such as UV light source 138A (FIG. 3), or from a UV light source 138 that does not move with the print head 130 used to print the portions 152A, such as UV light source 138B.
  • the portions 152B or pattern 150B may be exposed to UV light during step 172 from a UV light source 138 that is attached to the print head 130 used to print the portions 152B, such as UV light source 138A (FIG. 3), or from a UV light source 138 that does not move with the print head 130 used to print the portions 152B, such as UV light source 138B.
  • a UV light source 138 that is attached to the print head 130 used to print the portions 152B, such as UV light source 138A (FIG. 3)
  • a UV light source 138B that does not move with the print head 130 used to print the portions 152B, such as UV light source 138B.
  • the resultant composite image or pattern 150C formed on the substrate 108 includes the patterns 150A and 150B having visibly discernible gloss levels.
  • the differential gloss levels of the composite image or pattern 160C may be used as a security mark for authenticating the product formed by the printed substrate 108, such as a credential product, and/or information presented on the product.
  • a security check of the product may be performed by a user by, for example, viewing the pattern or image 150C at an angle to the surface 146, at which the different gloss levels of the patterns 150A and 150B may be discerned.
  • the differential gloss levels formed on the substrate 108 may be used to encode and validate information in a credential product, such as identification numbers, birth dates, photos, logos, etc.
  • a credential product such as identification numbers, birth dates, photos, logos, etc.
  • the information on the substrate 108 may be configured to be viewed as having a matte finish while the area of the substrate 108 surrounding the information may be viewed as having a high- gloss finish, or vice versa.
  • the pattern 150 A (FIG. 6C) may include information pertaining to the card holder or the card issuer having a different gloss level than the surrounding pattern 150B.
  • the printed product itself may be authenticated by visually discerning differential gloss level security marks on the substrate 108, such as differential gloss levels of logos, patterns, and other features of the substrate 108, relative to other portions of the substrate 108.
  • Such features may be represented by the pattern 150A (FIG. 6C) which has a visually distinguishable gloss level distinguishable from the surrounding pattern 150B, for example, as discussed above.
  • Embodiments of the present disclosure also include printed products having security marks formed using one or more embodiments of the methods described herein.
  • the printed product includes a credential product, such as those mentioned above.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Ink Jet (AREA)

Abstract

L'invention concerne un procédé d'impression d'une mention de sécurité sur un substrat (108) à l'aide d'au moins une tête d'impression à jet d'encre (130), des premier et second motifs (150A, 150B) étant imprimés (160) sur une surface (146) du substrat à l'aide de ladite tête d'impression. Des parties (152A) du premier motif sont exposées (170) à une lumière ultraviolette (UV) pendant une première période de temps suite à l'impression des parties du premier motif. Des parties (152B) du second motif sont exposées (172) à une lumière UV pendant une seconde période de temps suite à l'impression des parties du second motif. Les première et seconde périodes de temps sont réglées (174) pour former un degré de brillance dans le premier motif différent du degré de brillance dans le second motif.
PCT/IB2017/057903 2017-12-13 2017-12-13 Mentions de sécurité à degrés de brillance différenciés Ceased WO2019116079A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3689624A1 (fr) * 2019-02-01 2020-08-05 Assa Abloy Ab Imprimante à carte et à jet d'encre dotée d'un capteur de position de carte
WO2023108141A1 (fr) * 2021-12-10 2023-06-15 Electronics For Imaging, Inc Régulation de brillance variable par transformation thermique

Citations (5)

* Cited by examiner, † Cited by third party
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