EP2483475A1 - Elément de sécurité destiné à être inséré dans un papier de sécurité - Google Patents
Elément de sécurité destiné à être inséré dans un papier de sécuritéInfo
- Publication number
- EP2483475A1 EP2483475A1 EP10757437A EP10757437A EP2483475A1 EP 2483475 A1 EP2483475 A1 EP 2483475A1 EP 10757437 A EP10757437 A EP 10757437A EP 10757437 A EP10757437 A EP 10757437A EP 2483475 A1 EP2483475 A1 EP 2483475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- security
- wavelength
- region
- paper
- security feature
- 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.)
- Withdrawn
Links
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
- D21H21/42—Ribbons or strips
Definitions
- the present invention concerns security features for inclusion in security papers. More particularly, the invention concerns a security feature for inclusion in pulp from which a security paper is manufactured.
- security features included in security papers are holograms, foils, metallic threads, planchettes, watermarks, and microdots.
- Another example of a security feature that is incorporated into a security paper is a security fibre.
- Paper is made from paper pulp, which contains cellulose fibres, for example wood, hemp, straw and cotton linters. (note that, whilst those cellulose fibres are used to make paper, they are not themselves made from paper) .
- a known security technique is to replace, with artificial fibres made from materials such as polyester, nylon and rayon, some of the cellulose fibres used to make a security paper.
- a relatively small number of the artificial fibres can be included in the paper pulp, along with a majority of cellulose fibres, which results in the security paper that is manufactured from the pulp having the artificial fibres distributed embedded within it and randomly distributed.
- the artificial fibres can be dyed or coated, resulting in the paper including a random pattern of small coloured regions.
- the dye can be a dye that is responsive to ultraviolet (UV) light, so that the coloured random pattern is visible only under UV light.
- Such artificial fibres are generally fibrous in shape (i.e. predominantly one-dimensional, rather than two- dimensional or sheet-like) , like the cellulose fibres they replace.
- WO2004/025028A1 D W Spinks (Embossing) Ltd
- security features that are referred to as "fibres” because they substitute for and bond with the cellulose fibres used in the manufacture of security paper, and because, in the manufactured paper, they give a visual impression that suggests that they are similar to such fibres.
- the paper fibres described in that document are small strips of paper, and are not fibrous in shape.
- the "fibres" are intended for incorporation into paper products as a form of counterfeit protection.
- Each fibre has a plurality of coloured regions visible on front and rear sides of said fibre, wherein the colours are visible only under UV light.
- the regions may be in the form of stripes, or may be arranged in a pseudo-random pattern.
- the regions may be differently coloured.
- planchettes and traditional (fibrous) security fibres are distinct kinds of security feature; however, planchettes are similar to the fibres described in WO2004/025028A1 insofar as they are both made of paper and they are both intended for inclusion in paper pulp used for the manufacture of security paper.
- planchettes are typically relatively large, circular pieces of paper or film which may be coated with dyes or pigments. They have limited usefulness as security devices, as they are difficult to use in paper making: planchettes do not bond well within sheets of paper; consequently, they A pick out' during subsequent printing processes carried out on the paper sheet. Prior-art fibres are typically more than about 20 times smaller than
- planchettes (a nylon fibre might typically be 18 microns in width and 4 mm long having a surface area of .072 mm 2 , whereas a planchette might be 1.5 mm diameter having a surface area of 1.77 mm 2 ) . Because they are long and thin, security fibres entwine better than planchettes with the fibres in the base material, and hence better into the sheet of paper.
- planchette that fluoresces in different colours when illuminated with UV light of different colours.
- the planchette fluoresces in a blue colour; when illuminated with short-wavelength UV, a green fluorescence is excited; however, the blue fluorescence is also excited to some extent by the short-wavelength UV, resulting in the planchette having a greeny-blue colour overall.
- the colour response of the planchette to UV illumination of different colours is not well
- GB 2300596 A describes a security feature that
- the fluorescent components may be in the form of coatings or incorporated in the substrate.
- the UV light absorber may be in the
- WO 02/46528 Al describes a security feature that is used with a substrate.
- the security feature includes a plurality of fluorescent micro-particles that form a background component of the security feature and a plurality of fluorescent discrete particles that form a foreground component of the security feature.
- the discrete particles are larger in size than the micro-particles and are
- micro-particles optionally distinguishable from the micro-particles under at least one illumination condition.
- illumination condition optionally distinguishable from the micro-particles under at least one illumination condition.
- the security feature is applied as a coating to the substrate, and the security feature further includes a coating binder in which the micro-particles and the discrete particles are contained.
- the discrete particles are optically distinguishable from the micro-particles under long wavelength ultraviolet light and/or under short
- the security feature Under no or low magnification conditions the security feature exhibits a generally uniform color to the naked eye, while in one embodiment under higher magnification conditions the discrete particles exhibit a first color while the micro-particles of the background component exhibit a second color, while in another
- the discrete particles exhibit a first color while the micro-particles of the background component exhibit a lack of color, while in a further embodiment the micro-particles of the background component exhibit a first color while the discrete particles exhibit a lack of color.
- the present invention seeks to provide an improved security feature for inclusion in a security paper.
- the present invention provides a security feature having the features set out in claim 1.
- the present invention provides a security feature having the features set out in claim 1.
- invention also provides a method of making a security feature, the method having the features set out in claim 14.
- Preferred (that is, optional) features of the invention are set out in the dependent claims.
- the present invention provides, according to a first aspect, a security feature for inclusion in a pulp from which a security paper is to be made, wherein the security feature is a sheet divided into a plurality of regions, said regions comprising: a first region that includes a first pigment that fluoresces in response to illumination by UV light of a first, longer, wavelength, and a second, different, region that includes a second, different, pigment that fluoresces in response to illumination by UV light of a second, shorter, wavelength.
- the regions of the plurality are not co-extensive, nor are they overlapping and wholly contained one within
- the regions of the plurality may be discrete regions, with no overlap between adjacent regions. At least some of the regions of the plurality may overlap each other.
- the invention enables printing of detailed images, such as typographic symbols (e.g. text), that fluoresce when illuminated by UV light of the shorter wavelength, on a security feature on which there is also printed ink that fluoresces when illuminated by UV light of the longer wavelength.
- prior-art security features that fluoresce at both wavelengths suffer from a problem if fine details are attempted at the shorter
- pigments that respond to the longer wavelength typically also show some fluorescence at the shorter wavelength, which causes details printed using the ink responsive to the shorter wavelength to be
- UV part of the electromagnetic spectrum can be divided in different ways.
- References to "long- wavelength UV” or similar phrases as used herein refer to UV light having a wavelength of 300 nm to 400 nm (also called
- UV near UV
- mid UV UV light having a wavelength of 200 nm to 300 nm
- the longer wavelength may be a wavelength in the near UV.
- the first pigment may have a peak response at or around 365 nm.
- the shorter wavelength may be a wavelength in the mid UV.
- the second pigment may have a peak response at or around 245 nm.
- the maximum width of the sheet may be for example 0.1 mm, 0.2 mm, 0.3 mm. 0.4 mm, or 0.5 mm.
- the maximum length of the sheet may be for example 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.5 mm or 2 mm.
- the sheet may be a sheet of paper.
- the paper may have a basis weight of between 10 gsm and 75 gsm.
- the paper has a basis weight of between 10 gsm and 35 gsm; according to American Paper Weights and Measures, tissue paper has a basis weight of between 10 gsm and 35 gsm, and thus the sheet may be a sheet of tissue paper.
- the paper has a wet tensile strength of at least 1 N/15mm, more preferably at least 3 N/15mm. It may be that the paper has a wet tensile strength of less than 15 N/15mm, preferably less than 7 N/15mm.
- the wet tensile strength may be the wet tensile strength of the paper itself, or it may be the wet tensile strength of the paper including any print, varnishes, or other material which increases the wet tensile strength relative to that of the paper itself.
- the paper may have a dry tensile strength of about 5 daN/30mm.
- the paper may have an opacity of up to 90% or more, or alternatively may be transparent.
- the paper may include a varnish .
- the fluorescence of the first pigment may be in the visible region of the electromagnetic spectrum.
- the fluorescence of the second pigment may be in the visible region of the electromagnetic spectrum.
- the fluorescence of the first region and the fluorescence of the second region may be in different colours (i.e. at different wavelengths) .
- the plurality of regions may include one or more further regions.
- One or more of said further regions may be visible under illumination by visible light.
- One or more of said further regions may fluoresce in response to
- One or more of said further regions may fluoresce in response to illumination by UV light of the first wavelength.
- One or more of said further regions may fluoresce in response to illumination by UV light of the second wavelength.
- One or more of said further regions may fluoresce in response to illumination by UV light of a third wavelength, different from the first and second wavelengths.
- One or more of said further regions may fluoresce in the same colour as the first region.
- One or more of said further regions may fluoresce in the same colour as the second region.
- One or more of said further regions may fluoresce in a colour that is different from the colour or colours in which the first and second regions fluoresce.
- the first region may comprise a plurality of stripes that fluoresce in at least two (preferably two or three) colours when illuminated by the first wavelength.
- the stripes may be arranged in a repeating pattern.
- the first pigment may be present in substantially all of the first region.
- the first pigment may present in less than all of the first region; for example, there may be one or more sub-regions of the pigment within the first region; the one or more sub-regions may for example form images or text within the first region.
- the images or text which may be formed within the first region or are within the second region may be microprinting; for example individual characters of text may in their largest dimension be smaller than 1 mm, smaller than 500 microns, smaller than 200 microns, smaller than 100 microns or even smaller than 50 microns.
- the second region may form a margin on the sheet.
- the second region may be adjacent to the first region.
- the second region may substantially surround the first region.
- the second region may be at the ends of the sheet.
- the second region may be at the edge of the sheet.
- the first and/or second pigment may be visible from both sides of the sheet. Alternatively, it may be that the first and/or second pigment is visible from only one side of the sheet.
- the pigments may be contained in inks present on a first face of the sheet. It may be that at least one of the inks present on the first side of the sheet does not bleed through to the opposite side of the sheet, but it may nevertheless be that the ink is visible from the opposite side of the sheet. It may be that at least one of the inks present on the first face of the sheet does bleed through to the opposite side of the sheet. It may be that at least one f the inks is present on both sides of the sheet, either as a result of bleed through or because it has been applied by printing on both sides.
- the present invention provides, according to a second aspect, a security paper including a security feature according to the first aspect of the invention.
- the present invention provides, according to a third aspect, a method of making a security feature for inclusion in a pulp from which a security paper is to be made, the method comprising
- UV light of a second, shorter, wavelength.
- the first and/or second pigment may be applied for example by printing (which may be impact or non-impact printing), coating or dyeing.
- the first and/or second pigment may be applied using print transfer techniques ( i . e . plates or cylinders that transfer the image) .
- the first and/or second pigment may be applied without using print transfer techniques, for example by slot coating or selective dyeing (i.e. using photoresist chemicals) .
- print transfer techniques for example by slot coating or selective dyeing (i.e. using photoresist chemicals) .
- non-impact printing include ink-jet printing, laser printing, and thermal printing.
- the present invention provides, according to a fourth aspect, a method of making a security paper according to the second aspect of the invention, comprising forming a pulp, including in the pulp a plurality of security features according to the first aspect of the invention, and forming the security paper from the pulp.
- Another aspect of the invention provides: a security feature for inclusion in a pulp from which a security paper, in which the security feature will be embedded, is to be made, wherein the security feature is a sheet, which is divided into a plurality of regions, and which includes a first pigment, in a region of the
- the fluorescent pigments may fluoresce under illumination by light of a region of the spectrum other than the ultra-violet region.
- the first and/or second pigment may fluoresce (that is, emit visible light), in response to illumination by infra-red (IR) light, for example light in the near- infrared (light having a wavelength of 750 nm to 1.4 microns) .
- IR infra-red
- Fluorescence under illumination by light in the infrared may be a result of the anti-Stokes effect.
- the first pigment emits visible light in response to illumination by UV light
- the second pigment emits visible light in response to illumination by IR light.
- the UV response of the first pigment provides a first,
- the IR response of the second pigment provides a second, forensic, test.
- Figure 1 is a schematic view of an example security device according to a first embodiment of the invention, illuminated by (a) visible light, (b) long-wavelength UV light, and (c) short-wavelength UV light;
- Figure 2 is a schematic view of an example security paper according to a first embodiment of the invention, illuminated by (a) visible light; and (b) long-wavelength UV light;
- FIG. 3 is a flowchart showing steps in the
- Figure 4 is a flowchart showing steps in the manufacture of the example security paper of Fig. 2;
- Figure 5 is a schematic view of an example security device according to a second embodiment of the invention, illuminated by (a) long-wavelength UV light, and (b) short- wavelength UV light;
- Figure 6 is a schematic view of an example security device according to a third embodiment of the invention, illuminated by (a) long-wavelength UV light, and (b) short- wavelength UV light; and
- Figure 7 is a schematic view of an example security device according to a fourth embodiment of the invention, illuminated by (a) visible light, (b) long-wavelength UV light, and (c) short-wavelength UV light.
- Fig. 1 shows an example of a security device according to an example embodiment of the invention, in the form of a security fibre.
- the fibre is a small strip of paper 10, in this example 0.2 mm x 1 mm.
- the fibre 10 includes pigments that are visible only when illuminated with UV light.
- Fig. 1(a) when the fibre 10 is viewed under visible light (Fig. 1(a)), it appears white.
- Fig. 1(b) When the fibre 10 is viewed under long-wavelength UV light (Fig. 1(b)), a series of regions 20 appear along the fibre 10, except for at its ends, which remain white regions, forming margins 30.
- the regions 20 in this example are printed with fluorescent pigments, such that the regions 20 form a series of coloured bands under long-wavelength UV illumination. In this example, the bands form a periodic sequence, [White] -Red- Green-Blue-Red-Green-Blue- [White ] .
- pigments in margins 30 fluoresce, forming, in this example, text 40 (visible with the aid of a magnifying glass or microscope) .
- the pigments that fluoresce under long-wavelength UV light typically have a broad response to illumination by UV, so that they will fluoresce weakly even under short-wavelength UV.
- the fibres 10 are incorporated into the paper pulp used to manufacture a security paper, in this example a banknote 50 (Fig. 2). Under visible light (Fig. 2(a)), the fibres 10 are unremarkable, blending in with other, cellulose, fibres that make up the paper of the banknote 10. However, under long-wavelength UV light, the fibres 10 fluoresce, forming a random pattern of multicolour markings in the banknote 50, indicated schematically by the dotted pattern in Fig. 2(b) . Under short-UV light, the text 40 becomes visible, under magnification (not shown in Fig. 2) . Thus a long-wavelength UV light is used for first-level check of the validity of the security paper, e.g. in a shop, or by a bank teller, and a short-wavelength UV light is used as a further, forensic, occasional, check, and as evidence that the fibres 10 supplied to the manufacturer of the security paper are themselves genuine.
- a long-wavelength UV light is used for first-level
- Fibres 10 are in this example manufactured by the process shown in Fig. 3. Paper is drawn from a roll in a paper store 60 and passed to a printing machine 70.
- Printing machine 70 includes ink reservoirs 80 (a) to (d) , which contain three inks containing pigment fluorescent in different colours when illuminated with long UV wavelengths and one ink containing pigment fluorescent when illuminated with short wavelength UV wavelengths.
- the printing machine prints regions 20 and text 40 onto fibre 10, to form
- the printed paper passes to cutting machine 90, where it is cut into fibres 10.
- the cut fibres 10 are deposited into a bin 100 for transport to a paper mill.
- Security fibres 10, produced by the method of Fig. 3, are drawn from store 110 and mixed with water and conventional cellulose fibres (from a second store 120) to form a pulp 130.
- a paper making machine 140 manufactures paper from pulp 130 using conventional methods.
- further processing of the paper takes place, including printing of standard images and the like.
- the manufactured and printed paper is then cut (step 160) to form the paper product 170, in this case, banknotes .
- fibre 510 is similar to fibre 10 of Fig. 1. It is blank under visible light. Again it has a plurality of bands 520 that fluoresce at different colours when illuminated with long-wavelength UV light (Fig. 5(a)) . In this example, however, white regions extend around the whole of the fibre 510, completely surrounding and enclosing the bands 520, and thereby forming a circumferential margin 530. Text 540, visible only when illuminated with short-wavelength UV light (Fig. 5(b)), is printed around the whole extent of margin 530.
- the fibre 610 has a first region that covers the whole face of the fibre, except for an elliptical central region 640, which forms a second region.
- the first region is printed with an ink containing a pigment responsive to long-wavelength UV illumination
- the second region is printed with an ink containing a pigment responsive to short-wavelength UV illumination.
- the fibre appears blank under visible light, shows a white ellipse surrounded by a fluorescent region (in this example a red region) under long-wavelength UV (Fig. 6(a)), and shows a fluorescent ellipse (in this example a blue region) surrounded by a weakly fluorescent red region under short-wavelength UV (Fig. 6(b)) .
- a fibre 710 again has bands 720 that fluoresce (in this example yellow and blue) when illuminated with long-wavelength UV light.
- bands 720 that fluoresce in this example yellow and blue
- every third band 725 is printed with visible ink
- Margin 730 extends around the bands 720, 725. In margin 730 there are printed, in ink that fluoresces under short-wavelength UV illumination, a series of typographic characters 740, in this example a repeating sequence triangle-square-circle. Thus, under visible light (Fig. 7(a)), only red bands 725 are visible. Under long- wavelength UV (Fig. 7(b)), bands 720 are visible, and under short-wavelength UV (Fig. 7(c)), typographic characters 740 are visible.
Landscapes
- Paper (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
La présente invention concerne un élément de sécurité destiné à être inséré dans une pâte dont est constitué un papier de sécurité (50), ledit élément étant une feuille (10). L'élément de sécurité comporte un premier pigment qui devient fluorescent en réponse à un éclairage par une lumière UV présentant une première longueur d'onde plus longue, et un second pigment différent qui devient fluorescent en réponse à un éclairage par une lumière UV présentant une seconde longueur d'onde plus courte. La feuille (10) est divisée en plusieurs zones (20). Le premier pigment se trouve dans une première zone, et le second pigment se trouve dans une seconde zone différente.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10757437A EP2483475A1 (fr) | 2009-09-30 | 2010-09-28 | Elément de sécurité destiné à être inséré dans un papier de sécurité |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0917166.1A GB0917166D0 (en) | 2009-09-30 | 2009-09-30 | A security feature for inclusion in a security paper |
EP10154172 | 2010-02-19 | ||
PCT/EP2010/064386 WO2011039199A1 (fr) | 2009-09-30 | 2010-09-28 | Elément de sécurité destiné à être inséré dans un papier de sécurité |
EP10757437A EP2483475A1 (fr) | 2009-09-30 | 2010-09-28 | Elément de sécurité destiné à être inséré dans un papier de sécurité |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2483475A1 true EP2483475A1 (fr) | 2012-08-08 |
Family
ID=42942087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10757437A Withdrawn EP2483475A1 (fr) | 2009-09-30 | 2010-09-28 | Elément de sécurité destiné à être inséré dans un papier de sécurité |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2483475A1 (fr) |
WO (1) | WO2011039199A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012153116A1 (fr) * | 2011-05-06 | 2012-11-15 | D W Spinks (Embossing) Limited | Dispositif de sécurité perfectionné |
GB2562262B (en) * | 2017-05-10 | 2019-12-11 | De La Rue Int Ltd | Security devices and methods for their manufacture |
US11352750B2 (en) | 2017-09-22 | 2022-06-07 | Council Of Scientific & Industrial Research | Shaped objects for use in security applications |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3779918D1 (de) * | 1987-08-19 | 1992-07-23 | Gao Ges Automation Org | Sicherheitspapier. |
GB8724570D0 (en) * | 1987-10-20 | 1987-11-25 | De La Rue Thomas & Co Ltd | Fluorescent compounds |
GB2300596B (en) | 1995-05-10 | 1998-11-04 | Portals Ltd | Composite material having fluorescent features |
US20020066543A1 (en) * | 2000-12-05 | 2002-06-06 | Spectra Systems Corporation | Fluorescent micro-particles embedded in a pigmented fluorescent coating for optical document security |
GB2392868B (en) | 2002-09-16 | 2006-02-01 | D W Spinks | Rainbow fibres |
US7192471B2 (en) * | 2004-09-24 | 2007-03-20 | Honeywell International Inc. | Aryl-ureido benzoxazinone compounds |
-
2010
- 2010-09-28 WO PCT/EP2010/064386 patent/WO2011039199A1/fr active Application Filing
- 2010-09-28 EP EP10757437A patent/EP2483475A1/fr not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2011039199A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011039199A1 (fr) | 2011-04-07 |
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