EP1626651B1 - Substrate provided with a confidential pattern - Google Patents

Abstract

A substrate (10) to be provided with a confidential pattern (40) using normal ink in a concealing region (20), wherein the concealing means (21) of the concealing region (20) is pre-printed with a special ink. Unlike the normal ink, the special ink can be permanently erased using a colour-removing agent (36). The colour-removing agent (36) is deposited on a colour-removing substrate (34) which is bonded to the substrate (10) and can be contacted with the concealing region (20).

Description

FIELD OF THE INVENTION

The field of the invention is that of printing and printing processes, usually used in the manufacture of printed product substrates. The invention particularly relates to a combination of a bleaching substrate and a substrate such as a document adapted to be provided with a confidential pattern by printing with a normal ink in a camouflage area.

STATE OF THE ART

A substrate is known from WO99 / 24267. This substrate comprises an adhesive film adhered to the substrate at the location of the camouflage zone. The confidential pattern forming an inscription is printed by laser printing or inkjet on the upper surface of the film. It becomes readable by separation of the film and the substrate. Separation causes permanent changes in the substrate. According to an alternative method known from EP 1 120 291 A2 the confidential drawing becomes readable by discoloration of the ink used to print the camouflage means in the camouflage zone with the aid of heat. The ink used is therefore a thermochromatic ink. According to EP 1 120 291 A2 the effect of the discoloration must be irreversible. However, EP 1 120 291 A2 does not indicate ink with this quality. In the case where such an ink exists, the choice is probably limited, inter alia, with regard to the colors.

US 2,952,080 also discloses a substrate adapted to be provided with a confidential pattern by printing with a normal ink in a camouflage area. However, it is appealed here, to reveal the confidential design, to a superposition of films some of which carries a partial image of this drawing.

PRESENTATION OF THE INVENTION

The combination of a bleaching substrate and a substrate adapted to be provided with a confidential design according to the invention is defined in claim 1. This combination according to the invention is thus characterized in that the camouflage means of the camouflage area is printed beforehand with a special ink. The special ink, unlike the normal ink, is irreversibly erasable with a bleaching product. The bleaching product is deposited in the bleaching substrate which is bonded to the substrate and can be contacted with the special ink in the camouflage area.

The normal ink may be toner of a laser printer or ink of an inkjet printer. By using an inkjet printer it is favorable to use a gray color composed for example of magenta, yellow and cyan.

According to one embodiment of the combination according to the invention, the special ink is an ink obtained by reacting the carbonless products CF and CB, such as those known to those skilled in the art.

The application of carbonless CF and CB products can be performed by depositing with the traditional printing technologies of the CB product on the substrate previously treated with CF.

According to an alternative embodiment, a mixture of the two products CF / CB is produced, one of two products being coated in microcapsules, the two products being placed in a common binder to make the deposit. Printing processes known to those skilled in the art allow to deposit this product by exerting sufficient pressure on the mixture at the time of deposition, so as to reveal the reaction, or to simply deposit the mixture without pressure excessive, and exert pressure later to reveal the graphic forms of the camouflage means.

According to an alternative embodiment, a mixture of the two products CF / CB is made based on a phenol resin. The dyes are developed completely in the mixture before being printed.

According to an alternative embodiment, an assembly of substrates is used with on one CF treatment, on the other CB treatment, possibly carried out with the techniques described above, and pressure is exerted on the assembly of in such a way as to reveal the graphic forms of the means of camouflage.

In the context of an alternative embodiment, dyes different from the traditional gray widely used in the carbonless copy are used to make the graphic forms of the camouflaging means, so that the result obtained on the substrate is of one color. different than gray.

In the context of an alternative realization, we assemble different colors within a single substrate, to obtain graphical forms and graphically elaborate inscriptions, such as those commonly encountered in the printing press.

The present description shows that there is no limit in terms of colors to the process as described above, inasmuch as the characteristics of the products used in the technologies of autopopy involve dyes, the color palette being unlimited, as known to those skilled in the art. Printing techniques, known to those skilled in the art, also allow the assembly of mixed shades before deposition on the substrate, but also overprint on the substrate-as encountered in four-color process-which has to effect an unlimited range of color shades in the inscriptions and graphic forms obtained on the substrate.

According to another solution, a black and / or water-based ink, available from ink manufacturers, is used to make the camouflage zone, this ink being deposited with traditional printing technologies, which are well known to the artist. skilled in the art.

According to the invention the camouflage means can be printed in the camouflage area with the special ink directly on the surface of the substrate. On the other hand, it is also possible to print camouflage means on an adhesive label and to deposit this label as a camouflage label on the surface of the substrate in the camouflage zone. In the context of one embodiment of the combination according to the invention, the bleaching product is a CF layer desensitizing ink, such as that used in printing technologies for canceling the autocopying properties of chemical papers, and particularly a solution containing the ethoxylated amines.

In the context of an alternative embodiment of the combination according to the invention, the bleaching product is a bleaching product such as those used in bleaching technologies for paper and textiles, and particularly commercial bleaching water or bleaching agents. optical brighteners.

The combination of a special ink obtained by CF / CB reaction and a desensitizing ink of CF layer gives better results, namely immediate, total and irreversible discoloration.

As a whitening product, it is also possible to advantageously use the following chemical product: Trade name : DIRAXOW S12 from CECA (F-92062 LA DEFENSE) Chemical name: N'N'N'polyoxyethylene N sulfpropylene diamine (diamine of sulfoxide with 12 Moles of ethylene oxide) CAS number: 61790-85-0

The bleaching substrate may be a fiber pad coated with bleaching product. To discolor the special ink used to print the camouflage means, the pad is separated from the substrate and contacted with the special ink in the camouflage area. This has the effect of instantly causing the fading of the special ink, which changes from its original color to a much lighter and even invisible color.

In a preferable embodiment of the combination according to the invention, the bleaching product is encapsulated in microcapsules, which can be broken off under pressure. The product thus obtained can be deposited on wipes (as bleaching substrates) such as those used in everyday life. The wipes can remain in the open air without the discolouring product, currently encapsulated, losing its effectiveness. The wipe is then used as a pad that is rubbed on the decolorizable printing, which has the effect of bursting the microcapsules of the bleaching product and thus obtaining a contact between the bleaching product and the ink special, which produces its discoloration.

According to another embodiment of the combination according to the invention, the bleaching product microcapsules can be placed in (by mixing) or on (by overprinting) an adhesive, as known to those skilled in the art, this glue. being deposited on a substrate and being used to fix this bleaching substrate in the substrate. At the same time, this glue is able to discolour impressions. Discoloration is achieved by applying this substrate as a bleaching substrate to the camouflage area, ensuring that the bleaching product and the camouflaging means are matched while applying pressure to the uncoated top surface of this substrate. This has the effect of popping the microcapsules bleaching product and thus discolor the special ink.

In the embodiment of the bleaching substrate described above, the bleaching product is in contact with the glue. The lack of tightness that is encountered on a proportion of the bleaching product micro-capsules generates a penetration of the bleaching product in the glue, which has the effect of disintegrating it. Then, the effectiveness of the bleaching product is lower.

According to another embodiment of the bleaching substrate there is an additional substrate between the bleaching product and the glue to avoid having in direct contact the bleaching product and the glue and to protect the glue. In order to obtain sufficient mechanical adhesion of the microcapsules, the additional substrate is treated on the surface which is in contact with the microcapsules of bleaching product.

According to another embodiment of the bleaching substrate, the glue is deposited in the bleaching substrate only in marginal strips on both sides of a central strip with the bleaching product. In order to obtain sufficient mechanical adhesion of the microcapsules, the bleaching substrate is treated on the surface of the central strip which is in contact with the microcapsules of bleaching product.

According to another embodiment of the combination according to the invention the bleaching substrate is adhered to a non-stick area. The non-stick area may be formed by an adhesive / non-stick substrate adhered to the substrate. Thus forming a sandwich complex for enclosing microcapsules bleaching product so that it is not in contact with the free air. This has the effect of preventing any sealing problems of the microcapsules, the consequences of which would be to make the discoloration inoperative.

According to a preferable embodiment of the combination according to the invention, the bleaching substrate (and the additional substrate) is (are) transparent (s), which makes it possible to avoid having to remove the substrate coated with bleaching product from the where it was put to ensure discoloration to see the phenomenon of discoloration by transparency, when the substrate supporting the prints is not itself transparent.

According to another embodiment of the combination according to the invention, the bleaching substrate (and the additional substrate) is (are) a plastic material.

According to another embodiment of the combination according to the invention, the glue is a permanent glue with respect to the substrate. Using a permanent glue ensures that the adhesive film can no longer be removed from the area to be discolored, which is an additional barrier to forgery that could be reprinted with a traditional ink camouflage means superimposed on the substrate after seeing the confidential drawing.

According to a preferable embodiment of the combination according to the invention, the substrate is adapted to be provided with the confidential design by laser printing or inkjet in the camouflage zone. However, the system of the invention also works with other printing technologies, provided that the ink used does not react under the effect of the bleaching product. By way of example, offset and UV typography inks make it possible to obtain the same result with regard to the resistance to fading.

The substrate may be a document formed for example by a sheet of A4 paper. The impression of the camouflage means can represent all the graphic forms imaginable: signs, characters, line, flat, etc. The confidential design is preferably an inscription of the characters and / or numbers.

BRIEF EXPLANATION OF FIGURES

• Fig.1 une représentation schématique d'une combinaison selon l'invention avec un moyen de camouflage réalisé en encre effaçable dans une zone de camouflage d'un substrat ;
• Fig. 2 un procédé d'impression laser ou jet d'encre d'un dessin confidentiel dans la zone de camouflage pour une personnalisation du substrat ;
• Fig. 3-5 un procédé de décoloration de l'encre dans la zone de camouflage ;
• Fig. 6 le substrat selon figure 5 sur laquelle le dessin confidentiel est devenue lisible ;
• Fig. 7 une représentation schématique d'une autre réalisation de la combinaison selon l'invention ;
• Fig. 8 sous a) -d) une représentation schématique d'une autre réalisation de la combinaison selon l'invention ;. et
• Fig. 9 sous a) -c) une représentation schématique encore d'une autre réalisation de la combinaison selon l'invention.

Hereinafter, the invention will be explained more precisely on the basis of the exemplary embodiments in connection with the drawings. We see in:

• Fig.1 a schematic representation of a combination according to the invention with a camouflage means made of erasable ink in a camouflage zone of a substrate;
• Fig. 2 a method of laser printing or inkjet of a confidential design in the camouflage area for customization of the substrate;
• Fig. 3-5 a process of discolouring the ink in the camouflage zone;
• Fig. 6 the substrate according to Figure 5 on which the confidential drawing has become readable;
• Fig. 7 a schematic representation of another embodiment of the combination according to the invention;
• Fig. 8 a) -d) a schematic representation of another embodiment of the combination according to the invention; and
• Fig. 9 a) -c) a further schematic representation of another embodiment of the combination according to the invention.

EMBODIMENT OF THE INVENTION

In Figure 1, there is designated by 10, a substrate which may be a sheet of paper A4 to 80 g per m ² . In a camouflage area (20) of rectangular shape on the upper surface (11) of the substrate (10) a camouflage (21) is printed with a special erasable ink.

Close to the camouflage area is deposited on the same surface (11) of the substrate (10) a sandwich complex (30), which has an adhesive / non-stick film (31) and an adhesive film (34). The films (31) and (34) consist of a transparent plastic material such as polyester. The adhesives (32) and (35) of the two films (31) and (34) are permanently. The upper surface of the film (32) was coated with a release product (33). Thanks to this coating (33) the adhesive film (34) can be removed from the film (31) as shown in Fig. (3). The adhesive (35) of the adhesive film (34) is superimposed with a bleaching product (36) encapsulated in microcapsules.

The substrate thus obtained, shown in FIG. 1, is ready to be used by issuing financial institutions to send for example to each customer the confidential code of his credit card as a confidential design. The agent of the financial institution prints, for example by means of a laser printer or an inkjet printer, some text such as the name and address of the recipient and, in the camouflage zone (20), his code confidential (40) as indicated in FIG. 2. This latter impression is preferably made (in positive or in negative) in weft of small dots so that the surface of the printed figures is only covered at 30%, so that it is impossible to read them on the means of camouflage. (21). Substrates thus completed are placed in envelopes and shipped to customers.

On receipt of its substrate, each customer makes the confidential code (40) readable by first detaching the adhesive film (34) and sticking it in line with the camouflage zone (20) as shown in FIGS. and 4. The customer will then exert pressure on the film (34) by rubbing the film as shown in Figure 5, which has the effect of popping the microcapsules of bleaching product and thus obtain a setting contact of the bleaching product and special camouflage printing ink (21). The special ink begins to fade immediately, then fades very quickly to become totally white, while the toner or inkjet ink of the PIN remains intact. The PIN appears because of the transparency of the film 34 as shown in Figure 5.

In the example described above the bleaching product (36) is in contact with the glue (35) of the adhesive film (34). The lack of tightness that is encountered on a proportion of the bleaching product micro-capsules generates a penetration of the bleaching product in the glue, which has the effect of disintegrating it. Then, the effectiveness of the bleaching product is lower (thus the discoloration is longer).

The solution as detailed in Figure 7 avoids having in direct contact the bleaching product (36) and the glue (35). In this solution there is another transparent polyester film (37) between the bleaching product (36) and the glue (35) to protect the glue (35).

The use of a transparent polyester film (37) as a glue protection screen (35) is a guarantee of rapid reaction. To do this, the film (37) is treated on the surface that is in contact with the microcapsules of bleaching product (36), in order to obtain sufficient mechanical adhesion of the microcapsules.

In the context of another embodiment of the invention and as detailed in FIG. 8, a camouflage means (21) is printed in a camouflage zone of a substrate (10) and a sandwich complex (30) is glued. ) (as the sandwich complex (30) of Figure 1 for example) on the back of the substrate (10) in line with the camouflage zone (20). Then a pre-cut 50 is made of the camouflage area (21). The agent of the financial institution prints by means of a laser printer or an inkjet printer for example a PIN (40) in the camouflage area (21). The client makes the confidential code readable by first cutting the pre-cutting of the substrate and turning it in its cavity in the opposite direction. This is possible because the lower surface of the film (31) was coated with a release product (33). Finally the customer will exert by friction a pressure on the film (34) e which has the effect of popping the micro-capsules of bleaching product (36) and thus to obtain a contact between the bleaching product (36) and the special ink of the printing of the camouflage means (21). The special ink starts to fade immediately. The PIN (40) appears because of the transparency of the film (34).

In the context of another embodiment of the invention and as detailed in Figure 9, a camouflage zone (70) is deposited on the same surface (11) of a substrate (10). sandwich (60) having a release adhesive film (61) and an adhesive film (64). The films (61) and (64) consist of a transparent plastic material such as polyester. The adhesives (62) and (65) of the two films (61) and (64) are permanently. The upper surface of the film (62) was coated with a release product (63). With this coating (63) the adhesive film (64) can be removed from the film (61) in the same way as shown in Figure (3).

As shown under b) in Fig. 9, the adhesive (65) of the adhesive film (64) is deposited in this film (64) only in marginal strips (68) on both sides of a central strip (69) with the product. bleach (66). This solution also allows, as the solution as detailed in Figure 7, to avoid having in direct contact the bleaching product (66) and the glue (65). This solution also has the advantage that the sandwich complex (60) can be produced in continuous form without waste.

In Figure 9 is further deposited in the camouflage area (70) an adhesive label (73) on the surface (11) of the substrate (10). The adhesive label (73) has a substrate (74), for example made of paper. The cohesion of the substrate is preferably chosen to be less strong than the adhesion of a conventional adhesive film to the surface of this substrate, in particular less than 1.5 Newton (measured by Finat method No. 1). Glue (75) of the adhesive label (71) is permanently. As also shown under c) in FIG. 9, a camouflage (71) with a special erasable ink is printed on the upper surface of the adhesive label (73). This solution has the advantage that the erasable ink must not be printed directly on the substrate (10) but can be printed beforehand by a specialized establishment.

In the manufacture of the substrates of the invention as shown in FIG. 9 it is therefore sufficient to deposit, in the same way as the sandwich complex (30 or 60) for example, the adhesive label (73) on the surface of the substrate. (10).

The sandwich complex (30 or 60) and the adhesive label (73) can be deposited in parallel and at the same time in the substrate (10). For that it is advantageous if the two parts have an identical extension in a dimension. For example, the two parts could have an identical height H. By against and preferably, the width L1 of the sandwich complex (30 or 60) is larger than the width L2 of the adhesive label (73).

Claims (17)

1. Combination of a decolorizing substrate (34, 64) and of a substrate (10) designed to be provided with a confidential pattern (40) by printing with a normal ink in a camouflaging zone (20, 70), characterized in that the camouflaging means (21, 71) of the camouflaging zone (20, 70) is printed beforehand with a special ink, special ink, unlike normal ink, being erasable irreversibly with a decolorizing product (36, 66), the decolorizing product (36) being placed in the decolorizing substrate (34, 64), which is connected with the substrate (10) and which can be brought into contact with the special ink in the camouflaging zone (20, 70).
2. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to claim 1, characterized in that normal ink is laser printer toner or inkjet printer ink.
3. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to claim 1 or 2, characterized in that the special ink is ink obtained by means of a reaction of the self-copying products CF and CB.
4. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to claim 3, characterized in that the special ink is ink obtained by means of a reaction of the self-copying products CF and CB in a mixture of the two products CF and CB made based on phenol resin.
5. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 4, characterized in that the special ink is a black washable ink and/or a water-based ink.
6. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 5, characterized in that the decolorizing product (36, 66) is ink desensitizing the CF-layer or a bleaching product such as those used in the textile industry or the paper bleaching technologies, in particular commercially available bleach or optical brighteners.
7. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 6, characterized in that the decolorizing product (36, 66) is encapsulated in microcapsules that are able to burst under pressure.
8. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that the decolorizing substrate is a coatable fibrous pad of decolorizing product.
9. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that the decolorizing substrate is a coatable wipe of decolorizing product.
10. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that the decolorizing substrate (34) is a film (34, 54) of transparent plastic material.
11. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that the decolorizing product (36) is placed by mixture in a glue (35) or superimposed on a glue (35), the glue(35) being used for connecting the decolorizing substrate (34) to the substrate (10).
12. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that the decolorizing product (36) is placed superimposed on a glue (35) with an additional substrate (37) between the decolorizing product (36) and the glue (35), the glue (35) being used for connecting the decolorizing substrate (34) to the substrate (10).
13. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 7, characterized in that a glue (65) is placed in the decolorizing substrate (64) only in the marginal strips (68) on both sides of a central strip (69) with the decolorizing product, the glue (65) being used for connecting the decolorizing substrate (64) to the substrate (10).
14. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 11 to 13, characterized in that the glue (35, 65) is a permanent glue with respect to the substrate (10).
15. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 14, characterized in that the decolorizing substrate (34, 64) is glued on an antiblocking zone.
16. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to claim 15 characterized in that the antiblocking zone is formed by an antiblocking substrate (31, 61) glued on the substrate (10).
17. Combination of a decolorizing substrate (34, 64) and of a substrate (10) according to any of the claims 1 to 16, characterized in that the camouflaging means (71) is printed on an adhesive label (73), said adhesive label (73) being placed as a camouflaging label in the camouflaging zone (70).

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