CA2947108A1 - Security strip and security document incorporating said strip - Google Patents

Abstract

The invention especially relates to a strip intended to be incorporated into a security document, this strip emerging onto the surface of said document in the form of windows, and comprising a transparent or translucent carrier material (4) covered, on one or the other of its opposite faces, with at least three separate and superposed coating layers (51, 52, 53), characterized in that it especially comprises an intermediate second layer (52) that has an optical rendering different from that of the first and third layers (51, 53); the intermediate second layer (52) being opaque and containing at least two regions (520) that are at least partially devoid of coating, these two regions (520) respectively having different outlines; the first (51) and third (53) coating layers form at least one pattern, one portion of the pattern in the first layer (51) being visible through one of said two regions that are at least partially devoid of coating, whereas at least one portion of the pattern in the third layer (53) is visible through the other of said two regions that are at least partially devoid of coating, said patterns being different from each other.

Description

Security banner and security document that integrates it The present invention relates to a safety strip intended to be incorporated in part in the structure of a security document at least partially made of fibers.
It also concerns a security document that is provided.
To guard against counterfeit documents security, such as banknotes, it has already been proposed to use means various security features, such as watermarks, fibers, boards, etc.
Other techniques include introducing into the paper the safety document an elongated element made of synthetic material headband or security thread that increases the difficulties of making of counterfeit products, but also to facilitate the authentication of the document by central banks when it has detectable means automatically (such as electrical conductivity or magnetism) but also by a typical user, in other words the man in the street for so-called first-level visual features.
The integration of this thread or band is realized at the time of the making the sheet of paper that will eventually form the document of security.
This integration can be done in "drowned" form, in which case the wire is embedded totally in the mass of the paper.
It was also proposed to incorporate the security thread in a to be visible by reflection, only in the form of a set of Windows.
This means that this thread is incorporated into the mass of the paper, sometimes flush with the surface of one of the faces of the banknote, which explains the use of the term "window".
Thus, the windows are visible by reflection, while the parts immersed are only visible by transmission. By the term "reflection", we the phenomenon by which the rays of incident light are think on the surface of the support.
In practice, this integration technique makes the wire of security is visible only from the top of the paper, and again partially, that is to say at the windows. The present invention for

2 aim to fill this gap. It is also intended to facilitate authentication security document that incorporates this banner, especially by the man of the street.
Another goal is also to make the manufacture of this headband particularly complex, so as to limit and complicate the most possible the manufacture of banners by unauthorized persons, other than fiduciary printers. Thus, the present invention, in a first aspect, a safety strip intended to be incorporated in part in the structure of a security document at least partially composed of fibers, this strip emerging on the surface of said document in the form of a set of windows, and comprising a transparent or translucent support material, covered, on one or other of its opposite faces, of at least three layers distinct and superimposed coating.
According to the invention, this band includes, among these three layers designated respectively first layer, second layer intermediate and third layer, a second intermediate layer presents an optical rendering different from that of the first and third layers.
The second intermediate layer is opaque and comprises at least two regions at least partially free of coating, these two regions with respectively different contours and the first and third coating layers consist of at least one pattern, part of the pattern the first layer being visible through one of the two regions less partially uncoated, while at least some the pattern of the third layer is visible through the other of the said two regions at least partially free of coating, the said grounds being different from each other.
Thanks to this combination of features, the presence of a opaque intermediate layer allows on both sides of it to affix of the complementary layers that will be visible from the front recto and the reverse side of the headband. Moreover, to the extent that the layer intermediate presents partially recessed regions of different contours these latest will be additional visible safety signs and authentication the bandage by the man in the street will be facilitated. And together, the task a fraudster will be made more complex.
In addition, the fact that part of the pattern of the first layer is visible through one of these regions and that part of the motive of the third

3 layer is also visible across the other region makes manufacturing of especially complex headband, which makes it more difficult for fraudsters to make the band according to the invention.
This gives a stencil effect, ie a filter effect.
In other words, the surfaces of the patterns are "filtered" by the shape of the regions and give different information depending on whether one observes the banner since her front side or back side. This stencil effect thus generates information different but intrinsically linked.
According to other advantageous and nonlimiting characteristics of this headband:
- the said renderings different optics are chosen from among colors, glosses, opacity / transparency and / or contrasts different;
said regions are totally devoid of coating;
- said regions are partially free of coating, and have the shape of a screened network;
it comprises at least one additional fourth layer;
- said fourth layer is opaque and overlaps a portion of the pattern of the third layer; and the layer furthest from the support is covered with a layer transparent protective, such as a film or varnish.
Another aspect of the invention relates to a document of security such as a bank note. This one is remarkable by the fact it has a strip according to one or the other of the preceding characteristics, which is embedded within this document while emerging on the surface of at least one of its visible faces, in the form of a set of windows.
Preferably, the security document is coated locally a deopacifying agent, that is to say, improving the visibility of the headband there where he does not emerge on the surface of at least one of the visible faces of the document.
Other features and advantages of the present invention will appear on reading the following detailed description of some modes preferred embodiments of the strip. This description will be made with reference to the drawings in which:
¨ Figure 1 is a simplified top view of a document security, in this case a bank note in which

4 partially integrated a headband, the security reasons that has this banner but has not been represented here;
¨ Figure 2 is a view of the opposite face, that is to say of the face back of the document of Figure 1;
¨ Figure 3 is a cross sectional view and very schematic a strip according to the present invention;
¨ Figure 4A is a partial perspective view with burst of three layers which are integrated in the strip according to the invention;
¨ Figures 48 and 4C are respectively front views, that is, to say of the front of the headband, and of the reverse side of the same headband, these views being plumbed one from the other;
¨ Figures 5A to 5C, 6A to 6C, 7A to 7C, 8A to 8C, 9A to 9C are views corresponding to Figures 4A, 48 and 4C according to other modes of realization of the headband.
The security document 1 represented in FIGS. 1 and 2 annexed here is a bank note.
According to a variant not shown, it could be another type of security document, such as a passport.
This security document is preferably based on paper cotton, with or without chemical pulp, cellulose-based paper or any other material containing fibers of different types and weights, including understood at least a portion of synthetic fibers. We can also use a support hybrid combining polymer (s) and paper.
As is well known in the prior art, a Headband 2 is partially incorporated in Document 1, while emerging in level of its upper surface corresponding to the front face 10 of the ticket, under the shape of a set of windows.
The strip extends along the small transverse dimension of the ticket. We have identified by the letter P the zones of the strip 2 which are integrated in bill and therefore are not completely visible, unlike F window areas, as shown in Figure 1.
When looking at the reverse side of this same note 1 (see figure 2), the presence of the strip 2 is detected, but this is completely covered by the fibers of the document, so that it constitutes a set N
embedded in the mass throughout its longitudinal extent.

Referring to Figure 3, we are dealing here, in section transverse, to the structure of a strip according to the present invention.
However, this representation is only made as informative. In particular, the dimension scales of the different elements

5 in this banner 2 are not respected. All layers do not are not represented and symbolically represented as points.
As shown in this figure, the strip according to the invention comprises a transparent, or at least translucent, support material 4, such as a plastic film.
This is for example a polyester film presenting as a non limiting a thickness of about 10 to 12 pm.
On the underside of this support material, that is to say in direction of the back side 11, is present a thickness 3 of adhesive or a adhesive mixture for securing the entire security strip 2 with the fibrous material of the document into which it will be inserted.
Against the second face of the support material 4 is present a stack of layers 5 which will be described more precisely the nature in relation with the following figures.
A protective layer 6, for example consisting of a film plastic or varnish, covers the entire stack. Preferably, he is absolutely transparent In a particular embodiment, the same material as that of the support 4 can be used.
This coating is intended to protect all information contained in the layers 5, while allowing their readability.
Finally, the whole is covered, on the side of the front side by a another layer 7 of adhesive, preferably of the same kind as the layer 3 (but not necessarily).
In Figure 4A and for ease of reading, only different layers of the stack 5 are shown. From the bottom to the top, these three layers 51, 52, 53 are superimposed and the first layer 51 is that which is contiguous to the support material 4.
We have deliberately represented here only a small fraction of the band 2 but it is obvious that this banner continues on both sides elements represented here to constitute a sufficiently long piece for be incorporated according to the transverse dimension of the security document.

WO 2015/16602

6 Moreover, with regard to FIGS. 4B and 4C, FIG. 4B
represents what is visible on the front side, that is to say in one direction which is located at the top of layer 53. As for the figure it symbolizes what is visible according to the reverse side of the stack According to the invention, and in this embodiment, we are dealing with a stack of three layers 51, 52 and 53. For the clarity of the representation, these layers have been represented as being delimited by lines devices that form a rectangle. This is however a view of the mind and it must be remembered that only the elements that will be described as being printed or deposited must be considered.
Thus, the layer 51 is formed of a set of opaque patterns, for example consisting of a printing black ink covering.
The reasons here consist, for illustrative purposes, in one line transverse curvilinear and whose initials FCOF is printed upside down with the 0 full letter.
The second layer 52, which can be described as intermediate, presents an optical rendering different from that of the first layer. Speak term different optical rendering, we mean that when we observe these two layers with the naked eye, we can immediately differentiate them from each other, in particular by their color, brilliance, opacity / transparency and / or their different contrast (es).
A feature of intermediate layer 52 is the it is opaque.
Any material with real opacity can be used, and it is preferable for example to form this layer by means of a deposit metallic such as an ink impression containing metallic effect particles gold, silver, copper etc. Alternatively, a vacuum deposition of a delicate layer of a metal for example aluminum or opaque copper and then remove locally by washing with soda or water, so as to create areas without coating.
This layer 52 partially covers the first layer 51.
In addition, it is provided with several negative regions 520, this which means they are free of cladding, these areas having respectively different contours.

7 In this case, we are dealing here with a first region 520 which consists of a window forming the number 5, and another region 520 which is constituted by the number 2014, registered in reverse.
In this embodiment, note also the existence a third region 520 'also formed by the numeral 5. We will speak later, in a more precise way.
On this intermediate layer 52 rests a third layer 53 which also presents a motif 530 constituted here of the representation stylized of the letter 0 on the one hand, and in the presence of four squares on the other go.
Advantageously but without this being an obligation, the materials used for the patterns of layer 51 are the same as those of the layer 53.
When we refer to Figure 4B, we can see that single-sided observation, the four squares of layer 53 completely obscure the region of the intermediate layer 52 formed by the number 2014. In On the other hand, it can be seen through the region 520 consisting of the first digit the existence of the underlying layer 51 which makes this figure readable 5.
Finally, the additional region 520 'is vertically no printing at layer 51.
On the other hand, when we make an observation by the reverse side (Figure 4C), that is to say from below the support material 4, it is observed at through zone 520 constituted by the date 2014, the presence of the layer underlying 53 and in this case small squares making it readable dated 2014, while area 520 consisting of the number 5 is completely obscured by the full 0 FCOF acronym in black ink.
From this description, it appears that the intermediate layer 52 makes it possible to differentiate the layers 51 and 53 from one another, as well as the reasons therein.
However, the presence of recessed areas of different shapes level of the intermediate layer, shows up according to observations of the face-up or reverse side, different information but intrinsically linked by their construction, allowing to authenticate the security document which is provided with this headband.
Referring to FIGS. 5A-5C, the nature of layers 51 and 52 is inverted. It is the same for the layers 52 and 53. Thus, the

8 functionality of this structure is identical to that which appears at of the Figures 4A to 4C, but the visual rendering is different.
Referring this time to FIGS. 6A to 6C, it can be seen that this time we are dealing with five different layers.
Thus, there is the presence of a first layer 51 with patterns 510. On this layer is a layer intermediate 52 opaque of which some areas 520 are devoid of coating.
Again, these areas 520 have different contours.
On this second layer is affixed a third layer 53 which is preferably identical in nature to the layer 51. This layer forms patterns referenced 530.
An additional layer that can be described as fourth layer 54 is superimposed on the stack 5 of the layers 51, 52 and 53.
This layer 54 is identical in nature or different from that of the second layer 52.
In the case in point, they are of the same nature.
This fourth layer 54 also exhibits perforated zones since the only region in which there is occulting material is here is a circle 540.
Finally, a fifth layer 55 covers the assembly. She is from preference of different nature than the first and third layers. Of way particularly advantageous, this layer 55 consists of an ink with selected from the optically variable, iridescent, crystal type liquids in order to create color change effects depending on the angle observation. This layer can be semi-transparent and comprises patterns 550 which are in line with patterns 530 and 510 or 540.
According to FIG. 6B, when one observes the stack 5 since the face-up in reflection, the fifth layer 55 reveals a first information formed by the patterns 550. The opaque coating of the layer 54 presents recessed areas overlapping with layer 55 and layer 53 can incidentally, advantageously, reveal another message in negative which is not overlapping layers 55 and 53.
The coating 53 is visible from the front face only through the recessed areas of the layer 54. Conversely, the coating 53 is visible from the reverse side (FIG. 6C) only through the recessed areas of the layer 52.

9 The resulting information of the stack 51, 52, 53, 54 and 55 plumb said recessed and overlapping regions of layers 52 and 54 are different since an observation in reflection of one of the faces, reciprocally the other side.
In the example of FIGS. 7A to 7C, the nature of layers 51 and 52 on the one hand, and 53 and 55 on the other hand, are two to two inverted.
The functionality of such a stack is identical to that of previous figures, but the visual rendering is different.
In the embodiment of FIGS. 8A, 8B and 8C, there is an at a first layer 51 consisting of a covering of black ink covering.
In addition, it should be noted that this black layer occupies only one part of the surface of the headband.
On this first layer is deposited a second layer intermediate 52, always formed of an opaque coating, for example of the type metallic, with areas devoid of coating.
In particular, these are the 520 zones that form between they number 2014 and that are carried out in the form of a network raster.
This means that there is a multiplicity of recesses in these zones, however, these being separated by the constituent material of the covering material.
The shape of the dot and the raster line as well as its orientation and its coverage are parameters well known to those skilled in the art. As example, and without limitation, we propose a plot of points 10 pm circular, with a coverage of 50% and orientation at 45.
Finally, a third layer is affixed to the second layer 52. It is identical in nature or not to that of the layer 51 and, in the case, they are of the same nature.
Referring to FIG. 8B, when one observes the stacking from the front face in reflection, the third layer 53 reveals a first information consisting of negative patterns 530.
The metallic-type opaque coating of the second layer 52 provides partially recessed areas overlapping with the first layer 51. The coating of the layer 51 is visible from the face front only through the partially recessed areas of layer 52, and reciprocally, the coating of the layer 53 is visible from the face back only through the partially recessed areas of the second layer 52. The information resulting from the stacking of the three layers 51 to 53 vertically partially recessed areas of the layer 52 have therefore been different since a observation in reflection of one of the faces, reciprocally of the other face, and present a visual, semi-transparent and more nuanced rendering than in the example Figures 4A-4C.
Finally, in the embodiment of FIGS. 9A to 9C, there is an to the same structure as in the figures that have just been described. Alone the the nature of the layers 51 and 52 on the one hand, 52 and 53 on the other hand, is inverted. The feature of the stack so realized is identical but the rendering visual

10 is different.
In an exemplary embodiment not shown, it is possible to coat locally the security document according to the invention with an agent deopacifying, that is to say, improving the visibility of the strip 2 where it emerges not on the surface of at least one of the visible faces of the document, so as to make more visible the information carried by the first layer 51 of stacking 5.
In yet another embodiment not shown, one at least layers 51, 52, 53, 54 or 55 may incorporate agents authenticated during automatic machine reading. This is by example of magnetic particles forming a continuous band, blocks or a code in the form of bits. It can also be conductive particles, fluorescent, phosphorescent, infrared radiation or having a specific signal detectable with a dedicated apparatus.

Claims (9)

11 1. Safety strip (2) to be incorporated in part in the structure of a security document (1) at least partially composed of fibers, this strip (2) emerging on the surface of said document in the form a set of windows (F), and comprising a transparent support material (4) or translucent, covered, on one or other of its opposite sides, with at least three layers (51, 52, 53) separate and superimposed coating, characterized in that it comprises of these three layers respectively designated first layer (51), second layer intermediate (52) and third layer (53), a second layer intermediate (52) which has an optical rendition different from that of first and third layers (51, 53);
that the second intermediate layer (52) is opaque and has at least two regions (520) at least partially without coating, these two regions (520) having respectively contours different ;
- and that the first and third layers (51, 53) of coating consist of at least one pattern (510, 530), a part of the pattern (510) of the first layer (51) being visible through one of said two regions (520) at least partially without coating, while at least one part of the pattern (530) of the third layer (53) is visible through the other said two regions (520) at least partially free of coating, said patterns (510, 530) being different from each other. Headband according to claim 1, characterized in that said different optical renderings are selected from colors, brightnesses different opacity / transparency and / or contrasts 3. Headband according to one of the preceding claims, characterized by said regions (520) being completely devoid of coating. 4. Headband according to one of claims 1 to 3, characterized by the fact that said regions (520) are partially devoid of coating, and have the form of a screened network. 5. Headband according to one of the preceding claims, characterized in that it comprises at least a fourth layer additional (54). Headband according to Claim 5, characterized in that said fourth layer (54) is opaque and overlays a portion of the pattern (530) of the third layer (53). Headband according to one of the preceding claims, characterized in that the layer furthest from the support (4) is covered with a transparent protective layer (6), such as a film or varnish. 8. Security document at least partially made up of fibers, such as a bank note (1), characterized by the fact that it integrates a headband (2) according to one of the preceding claims, which is incorporated in breast of it while emerging on the surface of at least one of its faces visible (10, 11) in the form of a set of windows (F). 9. Security document according to claim 8, characterized by the fact that it is coated locally with a deopacifying agent, that is to say improving the visibility of said strip (2).