WO2015128806A1

WO2015128806A1 - Tactile security element

Info

Publication number: WO2015128806A1
Application number: PCT/IB2015/051390
Authority: WO
Inventors: Philippe Dietemann
Original assignee: Arjowiggins Security
Priority date: 2014-02-28
Filing date: 2015-02-25
Publication date: 2015-09-03
Also published as: FR3018085A1

Abstract

Security element (1) intended to be applied to or incorporated at least partially into a fibrous substrate and comprising - a plastic support film (3), - at least one layer of a binder (2) at least partially covering the support film (3), - particles (4) that can be detected by touch, which are at least partially incorporated into the layer of binder.

Description

Touch security element

The present invention relates to the security elements used to secure documents such as banknotes and the articles thus secured.

The invention is more particularly concerned with security elements having a touch-sensitive tactile effect and secure documents that include such elements.

Security features may have first, second, or third level security features.

The security elements may be detectable to the naked eye, in daylight or in artificial light or to the touch, without the use of a particular apparatus, and may consist for example of colored fibers or boards, printed security threads or metallized totally or partially. These security elements are called first level.

Other types of security elements may be detectable only with a relatively simple apparatus, such as a lamp emitting in the ultraviolet (UV) or infrared (IR). These security elements comprise, for example, fibers, boards, strips, wires or particles. These security elements may be visible to the naked eye or not, being for example luminescent under a lighting of a Wood lamp emitting at a wavelength of 365 nm. These security elements are said to be second level.

Other types of security elements require for their detection a more sophisticated detection device. These security elements are for example capable of generating a specific signal when they are subjected, simultaneously or not, to one or more external excitation sources. The automatic detection of the signal makes it possible to authenticate, if necessary, the document. These security elements comprise, for example, tracers in the form of particles or fibers capable of generating a specific signal when these tracers are subjected to optronic, electrical, magnetic or electromagnetic excitation. These security elements are said to be third level.

Security threads are top-level security features specific to paper-based documents, whose window insertion is visually quickly detected by the user. On the other hand, to the touch, the detection is more difficult, because the difference in roughness between the wire and the paper is small and the wire has a relatively small thickness. The authentication of documents thus secured by the visually impaired is not easy.

Most of the touch-sensitive tactile security means for the visually impaired are provided via printing, generally in the form of a relief printing, in particular soft-sided printing, by embossing or by removing an excess of varnish.

The application FR 2873134 describes a security element comprising a tactile recognition element in the form of a knitted structure placed in the mass of the support.

The application FR 2907808 describes a security zone with tactile recognition, comprising particles detectable to the touch. The security zone may be in the form of a band or a pattern such as an alphanumeric character. The safety zone contains iridescent pigments.

The application WO 2010/044846 discloses a security element comprising tactile marks in the form of relief structures. The security element may be in the form of a security thread extending from one edge to the other of a fibrous substrate in which it is integrated. The wire can be incorporated into windows; in this case, the tactile marks may or may not be superimposed on the windows. Thus, some windows are superimposed with tactile marks, such as braille points, while others are not superimposed on any mark. In a variant, the security thread is completely integrated with the substrate, and the tactile marks are discerned through a certain thickness of paper. The marks may be formed by hot embossing a layer of a thermoplastic elastomer present on the surface of the wire. Alternatively, the marks are made using a resin crosslinked under UV or electron beam.

WO 02/34855 discloses an adhesive article having a substrate attached to an adhesive layer, the latter having protruding particles, to facilitate the adhesion of the article on a support.

WO 03/048455 discloses sheets having a rough feel.

There is a need to further improve the secure documents incorporating a security element authentiable to the touch, in particular to obtain an easy to recognize security including for visually impaired persons, and which is also relatively simple to manufacture and incorporate in the paper for a specialized company in the field.

The invention thus relates to a security element intended to be applied to or incorporated at least partially in a fibrous substrate, comprising:

a plastic support film,

at least one layer of a binder at least partially covering the support film, detectable particles which are at least partially incorporated into the binder layer.

The particles detectable tactilely, and the binder that incorporates them at least partially, constitute a "tactile layer".

Compared to a relief printing made directly on the fibrous substrate, the invention provides additional security, particularly when the security element is at least partially incorporated into the fibrous substrate.

It can also make it possible to create codes, for example with a particular distribution of detectable particles tactilely.

By "plastic film" is excluded a fibrous layer comprising plastic fibers.

Compared to a detectable security tactilely provided by printing on the document substrate, the invention is based on a detectable security to the touch forming part of the security element embedded in the substrate and makes counterfeiting more difficult.

The invention also makes it possible to guarantee a more durable tactile effect, since the security element is less exposed to wear than a security made directly on the fibrous substrate. In particular, the relief of the security element may be at least partially compensated by a certain thickness of the substrate.

The plastic backing may be less compressible than a paper backing. Tactile detectable particles are thus less likely to sink into the support, improving the tactile effect.

Preferably, the detectably detectable particles are resilient, which allows the security element to resist more easily the forces applied in a soft-printing process.

Preferably, the detectably detectable particles and the binder are present on an entire face of the support film, without discontinuity. Alternatively, the detectably detectable particles may be present in the form of patterns, for example simple geometrical shapes, and / or more sophisticated such as alphanumeric characters, or codes, on all or part of the surface of the support film. The patterns may extend discontinuously on at least one side of the support film. The patterns may extend at a non-zero distance from all edges of the support.

More preferably, and especially when the security element is a security thread integrated in windows in a substrate, the detectably detectable particles are present in the form of spaced zones, in particular of spaced lines, so as to limit the creation, even not to create, extra thicknesses at the bridges extending between the windows of the substrate.

The detectably detectable particles and the binder may be present on both sides of the support film, without discontinuity, in the form of patterns and / or as spaced apart areas.

Fibrous substrate

The fibrous substrate comprises the fibers and adjuvants conventionally used in the papermaking field, in particular cellulose fibers. The substrate may comprise a mixture of long and short cellulosic fibers.

The fibrous substrate comprises, for example, cellulosic fibers, in particular of wood, linen and / or cotton. Preferably, the substrate comprises cotton fibers.

The fibrous substrate may also comprise, at least in part, synthetic fibers.

The substrate may comprise one or more fibrous layers (also called jets) assembled after formation, especially in the wet phase.

The fibrous substrate may be covered on at least one of its faces with a plastic protective coating.

The substrate may comprise one or more safety structures obtained during manufacture, and the substrate may in particular comprise a watermark.

The fibrous layer (s) of the substrate may be made on a flat-bed or round-shaped paper machine, and the watermark (s) may be made partly wet according to the conventional methods known to those skilled in the art.

At least one fibrous layer of the substrate, better the entire substrate, may have a basis weight (according to ISO 536) of between 60 and 120 g / m ² , preferably between 70 and 90 g / m ²

At least one fibrous layer of the substrate, better the entire substrate, may have a thickness (according to ISO 534) of between 60 and 150 μπι, preferably between 70 and 120 μπι, for example about 100 μπι.

In an exemplary implementation of the invention, at least one fibrous layer of the substrate comprises a window, in the form of a recess, passing through or not, made for example on a paper machine or off paper machine, for example by drip reduction, die reduction, by laser cutting or by water jet.

The substrate may include printing, laser marking and / or magnetic coding. In an exemplary implementation of the invention, the substrate is a sheet material comprising at least two fibrous juxtaposed juxtaposed one on the other, the first jet comprising at least one elongated zone of zero thickness and that the second jet comprising at least one recess located opposite the at least one elongated zone of zero thickness of the first jet, this recess forming a window.

Support film

The support film is preferably made of synthetic hydrocarbon polymer, for example a polyester or selected from polyethylene terephthalate-based polymers.

The support film is most often transparent.

The support film may carry information. For example, the support may comprise relief structures, for example made by embossing.

The support film may also include printing, metallization / demetallization (eg Cleartext ^® type), laser marking, and / or magnetic coding.

The support film is preferably of thickness between 5 and 50 μπι.

The support film is preferably of constant width, especially between 1 and 30 mm.

The security element may comprise, for example on one side of the support film opposite to the binder layer, an opaque or semi-transparent layer with at least one aperture.

The opaque or semi-transparent layer is for example metallic. For example, the apertures are obtained by metallization / demetallization or printing, in the form of positive or negative writing, in particular of alphanumeric character and / or text.

The support film may carry any first, second or third level security element.

Binder

The binder comprises, for example, a polyvinyl alcohol (PVA) or a polyurethane (PU) or an acrylic polymer. It is preferably an elastomer, especially polyurethane or acrylic polymer.

Preferably, the binder comprises a heat-sealing adhesive. This has the advantage that it can then have a dual function, on the one hand to maintain the detectable particles on the support film, and on the other hand to improve the strength of the incorporation of the element into the substrate. The heat-sealing adhesive may include vinyl acetate, polyethylene, acrylic, or polyurethane. In particular, the heat-sealing adhesive may comprise ethylene vinyl acetate (EVA). According to a preferred variant, the binder is a mixture comprising at least two compounds chosen from vinyl acetates, polyurethanes and acrylic polymers.

The security element may comprise, in particular elsewhere than in the detectably detectable particles, for example in the binder, at least one luminescent or magnetic compound and more generally any security element of second or third level.

Preferably, the binder is deposited in amounts of between 3 and 15 g / m ² per side, by dry weight. It is notably deposited by gravure, flexography, screen printing, surfacing or coating.

Particles detectable by touch

Preferably, said particles are solid.

Alternatively, they are hollow.

Said particles may have a spherical, pyramidal, ovoid, polyhedral or similar shape.

Preferably, the size of the particles is between 5 and 150 μιη.

A size greater than or equal to 50 μιη is preferable to have a more easily detectable tactile effect.

Preferably, the size D50 of the particles is less than or equal to 90 μιη because beyond 90 μπι, the transfer and coating of the pigment within the binder becomes complex.

Preferably, the size of the particles is between 50 and 90 μιη.

Preferably, said particles are made of plastic, more preferably polyester, polyethylene, polyamide, polypropylene, polyurethane or a mixture thereof.

Alternatively, said particles are metal, silica, glass or wax.

It is preferable that the detectably detectable particles have sufficient resilience to withstand the stresses experienced in soft printing.

In this regard, the particles advantageously comprise a resilient material, preferably elastically deformable such as an elastomer.

It may be bicomponent particles, preferably of the core / shell type, and more preferably with a hard core and a resilient bark, in particular compressible and preferably elastically deformable comprising for example an elastomer.

In general, those skilled in the art will choose a material having sufficient hardness and / or elasticity so that the particles are perceptible after the treatments that will be subjected to the sheet comprising the securing means according to the invention, including printing in size during which high pressure, usually greater than 2x 10 Pa (200 bar), is applied to the sheet. Particles resistant to intaglio printing are polyurethane particles with a diameter of between 35 and 55 μιτι, sold by Daikin Chemical Europe under the name "Daiplacoat ^® RHC 230".

Advantageously, the detectably detectable particles are authenticatable and have additional security; they have, for example, iridescence, magnetism, or luminescence properties, and more generally any first, second or third level security, as defined above.

As a variant, additional secured particles having first, second or third level security characteristics, in particular iridescence, magnetism or luminescence properties, are present in admixture with the detectable particles. These particles are for example iridescent particles of "mica-titanium" type. Their size and / or concentration may make them undetectable to the naked eye when appropriate.

Preferably, the detectably detectable particles are based on an elastomeric material, for example based on polyurethane such as Decosphaera particles 90F Supercolori company. These particles have a diameter D50 of between 55 and 75 μιη. The choice of an elastomeric material is preferable for absorbing pressure stresses during the soft printing of the secured sheet.

In addition, the material used may be chosen depending on the desired tactile effect, such as a soft or rough touch.

A "rough" feel, that is to say the user perceives the reliefs in a particularly pronounced manner, can be obtained by using glass beads, such as those of a diameter of 20μιη, marketed by Sovitec under the name Microperl ^® 050- 20-215 or glass beads of average size Prizmalite P2453BTA 45 μιη and a maximum size of 90 μπι, marketed by the company Prizmalite industries.

A "soft" feel can be obtained by using polyurethane microspheres, such as those marketed by Dainishiseika under the name Daiplacoat RHC535 and of a size between 13 and 20 μιη.

A touch "soft" can also be achieved using expandable thermoplastic microspheres, such as those sold by the company Expancel under the name Expancel 820 ^® and a size between 10 and 25 μιη. A touch "soft granular" may be achieved using polyurethane microbeads of diameter between 35 and 55 μπι, such as those sold under the name ^® Daiplacoat RHC 230 by Dainishiseika society.

Security element

Preferably, the security element according to the invention, detectably tactile, is a security thread.

Such a yarn is conventionally introduced at least partially by mass into the fibrous substrate during manufacture thereof, and extends from one edge to the other of the secured document. It is preferably introduced in window (s).

Wide wires, with a width greater than or equal to 2 mm, are particularly suitable for tactile detection. The width of the wire is for example between 1 and 30 mm and its thickness between 5 and 50 μπι, preferably between 10 and 30 μπι.

In a variant, the security element according to the invention, detectably tactile, is a safety foil.

Such foil is conventionally applied to the surface of the substrate by hot pressing.

The security element may comprise a security feature, for example a metallization and / or demetallization, a luminescent or magnetic compound, an optically variable device, an RFID device, a microlens array, an iridescent or interferential pigment, a thermochromic compound or photochromic or liquid crystal.

The security feature may be present in the support film or on at least one side of the support film; alternatively, it is applied to the touch layer.

Preferably the touch layer is transparent so as to maintain the visual effect of the security feature, when the latter is superimposed at least partially on the touch layer.

The security element can be covered on at least one of its faces by a protective film. This film may be a polyester film, in particular of a thickness less than or equal to 10 μπι, for example equal to 6 μπι.

According to one variant, said protective film is coated with an adhesive, in particular a heat-sealing varnish, for example at the rate of 5 g / m ² . According to a preferred variant, the binder of the tactile layer acts as an adhesive during the covering by the protective film.

Secured sheet

The subject of the invention is also a secured sheet comprising a fibrous substrate to which at least a security element according to the invention is applied or at least partially incorporated, the sheet having at least one window in which at least one partially the security element, with at least one face not completely covered by the fibrous substrate.

The fibrous substrate may have the characteristics defined above.

The sheet may have at least one window in which at least partially extends the security element, with at least one face not completely covered by the fibrous substrate.

The sheet may have several windows in which the security element extends.

At least two windows can have different shapes, including polygonal or ovoid contours, these windows being arranged with a regular spacing or not on the sheet.

The secured sheet according to the invention may comprise at least two windows and at least one bridge between the windows, the windows having tactile zones in contrast with non-tactile zones constituted by the bridge or bridges.

The difference in tactility between the tactile zones defined by the windows in which the security element according to the invention extends and the non-tactile zones defined by the bridge or bridges and the vellum outside the bridges may allow the recognition of a signature. authentication.

The window or windows may have simple shapes, for example in the form of a triangular, rectangular, square, round and / or oval pattern.

The sheet may have a sequence of windows, for example in the form of a code, or "fantasy" windows as described in the patent application EP 1 501 980.

The shape as well as the frequency of appearance of the windows, and therefore of the tactile zones, can be controlled in order to create an appropriate signature enabling a secure document comprising the sheet according to the invention to be identified by touch.

Preferably, the sheet comprises a sequence of several tactile zones alternating with non-tactile zones, each touch zone being continuous and the tactility being uniform in all the tactile zones. In other words, in this case, the security element can have the same total thickness in each of the windows and the detectable particles can be uniformly distributed over the support film in the direction of its length.

As a variant, the different zones defined by the different windows may have different tactility, for example because the particles detectably detectable are not of the same size or not evenly distributed on the support film. In another variant, a touch zone may have a tactility that varies within the window, for example because the detectably detectable particles are absent in places. The touch zones defined by the windows are preferably of sufficiently large size, they define in particular a minimum area of 5 mm ² , preferably 15 mm ² to allow their perception tactilely. For example, in the case of a security thread, the largest width of a touch zone is preferably greater than 1/4, better at half the width of the wire.

Preferably, the non-tactile areas, i.e. the bridge (s) and the vellum outside the bridges, are sufficiently wide to allow the contrast with the tactile areas to be perceived. For example, the length of a non-tactile zone in a direction parallel to the length of the security thread is between 1/4 and 4, better between 1/3 and 3, better between 1/2 and 2 times the length of the safety thread. la and adjacent touch zones.

The fibrous substrate may be covered on at least one of its faces with a protective film, for example a polyester film, in particular with a thickness of 6 μπι.

Secure document

The invention also relates to a secure document comprising a secured sheet according to the invention.

The secure document is for example a security document or value, such as a means of payment, for example a bank note, a check, a bank card or a restaurant ticket, an identity document, such as a identity card, a visa, a passport, in particular the personal data page of a passport, an "inlay" or a driving license, a lottery ticket, a ticket or a ticket for admission to cultural or sporting events.

Manufacturing process

The subject of the invention is also a method for manufacturing a security element according to the invention, the particles that are detectably detectable being dispersed in the binder in the fluid state and applied to the plastic support film before the cutting is done. the latter, especially son.

The detectable particles that are tactilely dispersed in the binder in the fluid state are applied to the film by coating or printing. It is notably deposited by gravure, flexography, screen printing, surfacing or coating.

The binder is preferably of PVA type or elastomer of PU or acrylic type, as indicated above.

The invention also relates to a method for manufacturing a secured sheet according to the invention, comprising a step of inserting the security element in the fibrous substrate having at least one window, to form the secured sheet. The window is for example formed in a wet manner, in particular using a round shape or a flat table.

According to one variant, the security element and in particular the tactile layer is modified locally, for example by means of a laser, an embossing or a chemical attack, so as to locally alter its tactility. These modifications can lead to the formation of geometric or alphanumeric patterns, perceptible visually and / or tactilely.

Authentication method

The invention also relates to a method for authenticating a secure document according to the invention, comprising a step of detecting the touch of the relief of the security element within at least one window of the document.

The detection at the touch of the relief is for example a difference in roughness or thickness felt between the tactile and non-tactile areas of the secured sheet.

The invention will be better understood on reading the detailed description which follows, examples of non-limiting implementation thereof, and on examining the appended drawing, in which:

FIG. 1 schematically and partly in section along the length, an example of a security thread according to the invention,

FIGS. 2a and 2b show, in front view, two variants of a security thread according to the invention,

FIG. 3 is a view similar to FIG. 1 of a variant of security thread, FIG. 4 is a bottom view along IV of the wire of FIG. 3;

FIG. 5 represents a view similar to FIG. 4 of a variant of security thread according to the invention,

FIG. 6 is a view similar to FIG. 1 of a variant of security thread, FIGS. 7a and 7b show two examples of secured sheets according to the invention in plan view,

FIGS. 8a and 8b show diagrammatically and partially, in section along VIII-VIII of FIG. 7a, two examples of secured sheets according to the invention, and FIGS. 9a and 9b are partial views in SEM (scanning electron microscopy ), respectively from the front and in section, of a security element according to the invention.

In the figures, the relative real proportions of the different constituent elements have not always been respected for the sake of clarity. FIG. 1 shows a security element 1 according to the invention, which comprises a plastic support film 3 on which is disposed a layer of a binder 2 covering the film 3 and incorporating detectably detectable particles. 3, the binder 2 and the particles 4 may be as defined above.

The security element may be in the form of a security thread.

The security thread may be intended to be introduced in window (s) 6. The windows 6 define touch zones and alternate with bridges 7 defining non-tactile areas, as detailed below.

The tactile particles 4 can be distributed uniformly and without discontinuity on an entire face of the support film, as shown in FIG. 2a.

As a variant, the tactile particles 4 are present in the form of spaced zones, in particular of spaced lines, so as to limit the creation of extra thicknesses at the level of the bridges 7 of the wire, as illustrated in FIG. 2b.

The detectably detectable particles may be more or less embedded in the binder layer. A thin layer of binder can cover the particles.

A protective film may cover the touch layer to improve the retention of the particles on the support film.

The gap g between two particles is for example greater than or equal to D / 2, where D is the size of the particles, for example their diameter when they are spherical.

In a variant not shown, the particles 4 do not uniformly cover the support film 3.

In the example shown in Figure 3, the plastic support film 3 has on one side 5 opposite to that covered by the binder 2, an opaque or semi-transparent layer 8. This layer 8, made for example by partial metallization, may comprise openings 9 obtained by demetallization. The openings 9 may form patterns, for example alphanumeric characters as illustrated in Figure 4, in the form of Cleartext ^® .

The support film 3 may also carry, in particular on this face 5, other security elements, for example a magnetic strip 10 consisting of a sequence of magnetic "bits" 10 'as shown in FIG. 5 or an interferential structure 14, as shown in Figure 6.

As illustrated in FIG. 6, the security element 1 may incorporate in the binder 2 other security elements 24 than the detectably detectable particles 4, for example a charge of a luminescent or magnetic compound. The support film 3 may itself also comprise additional security elements 34, of first, second or third level.

Preferably, the security element according to the invention is a security thread which is introduced in window (s) in a fibrous substrate 11, for example paper.

By way of example, FIGS. 7a and 7b show two secured sheets each having windows 6 in which the security thread 1 according to the invention extends.

The windows 6 extend for example on a face 16 and define touch zones that alternate with bridges 7 defining non-tactile areas.

The windows 6 may have different shapes. The sheet 15 has for example a succession of triangular and rectangular shaped windows as shown in Figure 7a or a succession of rectangular and square shaped windows of different sizes, as shown in Figure 7b.

In a variant not shown, the windows all have the same shape.

The tactile effect related to the presence of the security element 1 can be detectable only in the tactile zones defined by the windows 6, and not at the level of the bridges 7.

In the illustrated examples, the security element 1 extends from one edge 17 to the other 18 of the sheet 15. The length _d1 and ₂ of a non-tactile zone along the longitudinal axis X wire 1, is between 1/4 and 4, better between 1/3 and 3, better between 1/2 and 2 times the length // _; adjacent tactile areas. For example, we have 0.25 // <d _lt2 ≤ 4 // and 0.25 / ₂ <d _lt2 ≤ _4l ₂ .

The largest width b of a touch zone is preferably greater than half the width a of the wire 1.

The windows 6 are preferably aligned along a straight line parallel to the longitudinal axis X of the wire 1, but other arrangements are possible.

Preferably, two adjacent windows 6, in particular having different shapes, are not in contact, so as not to compromise the strength of the sheet and allow a better perception of the tactile areas.

The windows 6 may have tactile zones that offer the same feeling to the touch, for example because of the use of the same particles 4.

In one variant, the tactile zones defined, for example, by windows of a first shape, in particular triangular, have a tactility different from that of the zones defined by windows of a second shape, in particular rectangular. This difference in tactility can for example come from the presence of different tactile particles 4.

The substrate 11 may be single-jet, as illustrated in FIG. 8a.

In a variant, the substrate 11 is multijet, in particular bijet, as illustrated in FIG. 8b. In the latter case, the security element 1 is for example introduced between the two jets 12, 13 before assembly wet phase thereof.

The photocopies corresponding to FIGS. 9a and 9b show a security element consisting of a support film 3 made of PET, with a thickness of 12 μπι, and a tactile layer deposited in quantities of 10.2 g / m ² on the surface of the support 3.

Example 1

A polyester film with a thickness of 19 μπι is printed full screen width on one of its faces with a composition of the following formulation:

The solids content of the composition is adjusted to a value of 50% by addition of water.

The viscosity of the composition is adjusted by those skilled in the art according to the deposition method chosen.

The composition is printed on the support at a rate of 10 g / m ² .

The film thus obtained is cut into strips of 6 mm width and then introduced into windows during the manufacture of a paper substrate. Said windows are arranged to create a code authenticatable to the touch, as shown in Figure 7b.

Example 2

A polyester film with a thickness of 12 μπι is printed full width in gravure on one of its faces with a composition of the following formulation:

Function Chemical family Quantity (in dry weight)

Polyurethane binders 35%

Vinyl acetate 15%

Particle "touch" Glass beads 15%

Pigment with interferential effect Mica-Titanium 30%

2% Carbodiimide crosslinking agent

Additives (wetting, anti-foam ...) 3% The dry extract of the composition is adjusted by adding 50% water.

The composition is printed on the support at a rate of 12 g / m ² .

The film thus obtained is covered by lamination of a PET film thickness of 6 μπι coated with a heat-sealing varnish, cut into strips of width 8 mm, and then introduced into windows during the manufacture of a paper substrate. Said windows are arranged to create a code authenticatable to the touch, as shown in Figure 7a.

The invention is not limited to the illustrated examples. For example, windows 6 may be through. The windows 6 extending on the opposite faces of the secured sheet 15 may define touch zones of different shape and / or arrangement on each of the faces.

The particular features of the various examples can be combined with each other in the sense of non-illustrated variants.

The expression "comprising one" is synonymous with "comprising at least one", unless the opposite is specified.

Claims

A security element (1) intended to be applied to or incorporated at least partially in a fibrous substrate (1 1), comprising

a support film (3) made of plastic material,

at least one layer of a binder (2) at least partially covering the support film (3),

detectably detectable particles (4), at least partially incorporated in the binder layer.

2. Element according to claim 1, the binder (2) comprising a heat-sealing adhesive.

3. Element according to claim 1 or 2, the detectably detectable particles (4) being greater than or equal to 50 μπι.

4. Security element according to any one of claims 1 to 3, the detectably detectable particles (4) and the binder (2) being present on an entire face of the support film (3), without discontinuity.

5. Security element according to any one of claims 1 to 3, the detectably detectable particles (4) being present in the form of spaced apart areas, including spaced lines.

6. Security element according to any one of the preceding claims, the size D50 of the detectably detectable particles (4) being less than or equal to 90 μπι.

7. Security element according to any one of the preceding claims, the detectably detectable particles (4) being resilient, preferably based on an elastomeric material.

8. Security element according to any one of the preceding claims, being in the form of security thread, in particular of width (a) greater than or equal to 2 mm.

9. Element according to any one of the preceding claims, the detectably detectable particles (4) being authenticatable and having additional security, including properties of iridescence, magnetism, or luminescence.

10. Element according to any one of the preceding claims, comprising additional secured particles present in admixture with the detectably detectable particles (4), these additional secured particles having particular properties of iridescence, magnetism, or luminescence.

1. The element according to any one of the preceding claims, the binder (2) being deposited in amounts of between 3 and 15 g / m ² per side, by dry weight.

A secured sheet (15) comprising a fibrous substrate (11) to which at least a security element (1) according to any of the preceding claims is applied or at least partially incorporated, the sheet (15) having at least one window ( 6) in which at least partially extends the security element (1), with at least one face not completely covered by the fibrous substrate (11).

13. Secure sheet (15) according to claim 12, comprising several windows in which the security element extends, at least two windows (6) having different shapes, including polygonal or ovoid contours, these windows (6). being arranged with a regular spacing or not on the sheet (15).

14. Secure document comprising a secured sheet (15) as defined in claim 12 or 13.

15. secure document according to claim 14, constituting a means of payment, including a bank note, a check, a credit card or a restaurant ticket, or an identity document, including an identity card, a visa, a personal data page of a passport, an inlay or a driving license, a lottery ticket, a ticket or entry ticket for cultural or sporting events.

16. A method of manufacturing a security element (1) according to any one of claims 1 to 11, the detectably detectable particles (4) being dispersed in the binder (2) in the fluid state and applied to the film support (3) of plastic before cutting the latter, especially son.

17. A method of manufacturing a secured sheet according to claim 12 or 13, comprising a step of inserting the security element in the fibrous substrate having at least one window, to form the secured sheet.

18. The method for authenticating a secure document according to claim 14 or 15, comprising a step of detecting the touch of the relief of the security element within at least one window of the document.