FR3051141A1 - METHOD FOR PROCESSING A CUSTOMIZABLE SHEET FOR A SECURITY BOOKLET, AND CORRESPONDING CUSTOMIZABLE SHEET - Google Patents

Abstract

A method for processing a customizable sheet for a security booklet comprising a set of individual pages of the same dimensions, the method comprising the steps of: Producing (210) a customizable sheet stiffened with a material based on Plastic, and Define (220) a fold line on the customizable sheet, the customizable sheet comprising a customizable sheet and a non-customizable sheet arranged on either side of a fold line, the customizable sheet comprising a customizable page for to understand individual information about the holder of the booklet. It is essentially characterized in that it comprises: defining (240) a folding zone on the customizable sheet, and machining (230) locally said plastic-based material parallel to the fold line in the folding zone, in order to refine locally the thickness of said material according to a predetermined profile.

Description

METHOD FOR PROCESSING A CUSTOMIZABLE SHEET FOR A SECURITY BOOKLET, AND CORRESPONDING CUSTOMIZABLE SHEET

FIELD OF THE INVENTION

The present invention relates to the field of multi-sheet security documents, or security booklets, hereinafter "booklets" concisely, and in particular the manufacture of such booklets, typically in the field of passports.

A booklet includes a cover and a plurality of individual cellulosic fiber paper sheets, the cover and the sheets being folded along a fold line and stitched together using a seam that extends along the fold line along a line of seam coinciding with the fold line, so that the fold line and the seam bear the same numerical reference in the figures. After sewing, the fold line is sometimes also called "hinge".

In a booklet, the cover and the sheets are folded along a common fold line.

Sewing zone ZC defines an area which extends along the seam line, on either side thereof, and whose distance therefrom is less than a predetermined value; ideally, the sewing area is merged with the seam line, and ZP fold zone, an area that extends along the fold line, on either side thereof, and whose distance to this is less than a predetermined value and encompasses the seam area.

Each individual sheet 30 defines two sheets: a sheet 50 on one side of the fold line, and a sheet 60 on the other side of the fold line (see FIG. 4A).

Each leaflet defines two pages: a front page and a back page.

In the booklets, at least one of the pages is customizable (or personalized). It is also called "datapage" by anglicism.

A customizable page is configured to include variable individual data, such as a name, address, date of birth, photograph, and so on. relating to the holder of the booklet.

Thus, the term "customizable leaflet" means the leaflet that includes the customizable page; and by customizable sheet the sheet that includes the customizable sheet. The other sheet of the customizable sheet is said to be "non-customizable" in that it is not intended to bear variable information relating to the identity of the booklet holder. However, the non-customizable sheet may also be machined, as described later, for example for optical marking or tactile marking and also include other information.

As explained later, the structure of a customizable page protects the individual variable data it contains and differs from the structure of a page of an individual sheet.

In the remainder of the description, in conciseness, only the case where the customization of a customizable page is made on the front of the customizable sheet and where the transparent film (described later), when it exists, is affixed to the back.

The automatic or semi-automatic control operations of a booklet consist in particular of checking the variable individual data of the personalized page. For this purpose, insertion of said booklet in a reader may wrinkle the personalized page, which poses problems of reading later.

To overcome this problem, it is known to rigidify the customizable page with a plastic-based material: either the customizable page is cellulosic fiber-based paper and is deposited a layer of transparent plastic-based material against it (typically under this one); either the customizable page is made of synthetic paper - for example in Teslin (registered trademark), stiffened by a layer of preferably transparent plastic material; either the customizable page is integrally made of plastic-based material, for example polycarbonate or plastic, which stiffens in fact said customizable page.

The rigidity provided by the plastic-based material is particularly interesting to allow an easier reading of the booklet, without risking crumpling the personalized page. The use of plastic also makes it possible to integrate a set of securities, possibly including an RFID chip.

However, a customizable page stiffened with a plastic-based material does not allow the booklet to close properly when the page thickness is constant and significant on both sides of the fold line.

Various works have been done to try to solve this problem, this work essentially consists in modifying locally the composition of the customizable page, in particular by removing one or more constituent layers at the level of the folding zone.

For example, document EP1516749 is known which provides for the presence of paper only at the location of the hinge.

Also known are DE102008025075, DE102009051106, US6135503 and EP0936976 which provide stacks of layers whose number of layers is below the level of the hinge to the number of layers at the rest of the booklet.

The present invention provides a particularly clever alternative to these solutions.

SUMMARY OF THE INVENTION

More specifically, according to a first of its objects, the invention relates to a method of processing a customizable sheet for a security booklet comprising a set of individual pages of the same dimensions, the method comprising the following steps: - Producing (210 ) a customizable sheet stiffened with a plastic-based material, and - Define (220) a fold line on the customizable sheet, the customizable sheet comprising a customizable sheet and a non-customizable sheet arranged on each side of the line Folder, the customizable sheet comprising a customizable page of the same dimensions as the individual pages and intended to include individual information relating to the holder of the booklet.

It is essentially characterized in that it further comprises the steps of: Defining (240) a folding zone on the customizable sheet, and - Machining (230) locally said plastic-based material parallel to the fold line in the folding zone, according to a predetermined profile.

It can be provided that the machining step (230) comprises at least one of: A localized ablation step (233) of creating through-holes in the thickness of the plastic-based material,

A step (234) of localized refining, of reducing the thickness of the plastic-based material,

A combinatorial step (235) of localized ablation and localized refining of the plastic-based material.

In addition, at least one of the steps can be provided:

An optical marking step (231) of locally marking said plastic-based material outside the folding zone by machining said material in a first predetermined pattern so as to create an optically identifiable mark; and

A touch marking step (232) of locally marking said plastic-based material outside the folding zone by machining said material in a second predetermined pattern so as to create a tactile identifier.

It can be provided that at least one of the steps of the step (231) of optical marking and the step (232) of tactile marking is implemented on the non-customizable sheet.

It can be provided that at least one of the steps of the machining step (230) parallel to the fold line, the optical marking step (231) and the touch marking step (232) comprise a mechanical machining or laser machining.

The term "or" is to be understood in the non-exclusive Boolean sense. We can therefore provide mixed machining, that is to say mechanical and laser.

The method may further comprise a step of:

Sizing the customizable sheet so that the non-customizable sheet of the customizable sheet has the same height as the customizable sheet and has a width less than that of said customizable sheet.

It can be provided that at least one of the steps of the step (231) of optical marking and the step (232) of tactile marking is implemented on the non-customizable sheet.

In one embodiment, the customizable sheet comprises a sheet of cellulosic fiber paper, the method comprising a step of: depositing (290) a continuous layer of transparent plastic material on the cellulosic fiber paper sheet,

And, prior to the deposition step (290), at least one of: - depositing (300) an adhesive film between the cellulosic fiber paper sheet and the transparent plastic material (for example for example a layer of thermo-adhesive film such as Prochimir TC5011, Bayer Epurex range ... (registered trademarks)), and - Impregnate (310) the cellulosic fibers of an adhesive or coat the transparent plastic-based material with an adhesive. adhesive layer. The adhesive is advantageously taken from materials which make it possible to obtain an irreversible bonding such as a two-component adhesive, for example (Bostik Herberts range or Purbinder range) or Henkel (Liofoil range) (registered trademarks); or as a crosslinkable adhesive after exposure to a source of thermal or electromagnetic radiation (for example a cationic resin cured by exposure to UV radiation).

According to another of its objects, the invention relates to a customizable sheet (100) for a security booklet (10) comprising a set of individual pages of the same dimensions, the sheet being stiffened with a material based on plastic and capable of being produced by a method according to the invention, the sheet comprising: - a fold line (40), the customizable sheet comprising a customizable sheet (70) and a non-customizable sheet (80) arranged on either side of the line folding (40), the customizable sheet (70) comprising a customizable page of the same dimensions as the individual pages and intended to include individual information relating to the holder of the booklet, and either a plastic-based material, - or a sheet of cellulosic fiber paper and a continuous layer of transparent plastic material adhered by a layer of adhesive to said fiber paper sheet ellulosic, a sheet of synthetic paper.

Preferably, the synthetic paper sheet is made entirely of a plastic-based material or reinforced with a continuous layer of transparent plastic-based material adhered by a layer of adhesive to said sheet of synthetic paper.

It is essentially characterized in that it further comprises: a folding zone (ZP) in which said plastic-based material locally has a predetermined profile parallel to the fold line (40).

The plastic-based material may be machined locally parallel to the fold line (40) according to at least one predetermined profile out of: a predetermined profile in the thickness of said material, and a predetermined profile in the length of said material.

It can be provided that the plastics material locally present in the fold zone (ZP) at least one of: in cross-section, an L, U, S or W-shaped profile, in viewed from above, a set of contiguous recesses whose shape has a direction of elongation parallel to the fold line (40). It can be provided that the plastic-based material is selected from the group consisting of: - polycarbonate, and - polyethylene terephthalate (PET), polystyrene (PS), or polypropylene (PP).

It can be provided that the paper is selected from the group consisting of: - cellulosic fiber paper, - synthetic paper comprising a plastic-based material, in particular Teslin®.

Preferably, the sheet has:

Outside the folding zone, a total thickness of between 150 μm and 900 μm, and preferably between 200 and 500 μm, and

In the folding zone, a thickness of between 50 μm and 300 μm.

The customizable sheet can be inserted into the individual sheet of paper that forms the booklet. The invention also relates to a security booklet comprising a customizable sheet, possibly personalized, according to the invention.

Advantageously, the invention is compatible with all the passport page systems, particularly with paper pages based on cellulosic fibers, synthetic paper, or polymer (s).

The customizable sheet according to the invention locally has a very good compromise between sufficient flexibility so that the booklet comprising it can be closed and sufficient rigidity for the customizable page can be manipulated, for example during a control.

The customizable sheet according to the invention locally has a very good resistance to tearing, in particular with U-shaped or W-shaped profiles.

The customizable sheet according to the invention has a resistance to counterfeiting by minimizing the number of strategic elements of said sheet and making it virtually impossible to extract them for recovery for fraudulent purposes.

The customizable sheet according to the invention is advantageously easily customizable, for example by color inkjet or laser.

Advantageously, the invention does not add specific material to achieve the hinge function since the plastic-based material is necessarily existing to stiffen the customizable sheet. Thus, the invention does not introduce weakness of the booklet.

The present invention is particularly simple and inexpensive to implement. Other features and advantages of the present invention will emerge more clearly on reading the following description given by way of illustrative and nonlimiting example and with reference to the appended figures.

DESCRIPTION OF THE DRAWINGS FIG. 1A illustrates a cross-section of an embodiment of a security booklet according to the invention, FIG. 1B illustrates a cross-section of another embodiment of a security booklet according to FIG. 2 illustrates an embodiment of the method according to the invention, FIG. 3A illustrates a cross section of an embodiment of a customizable sheet according to the invention, after localized refining, having a profile in the form of a 3B illustrates a cross-section of an embodiment of a customizable sheet according to the invention, after localized refining, having a U-shaped profile, FIG. 3C illustrates a cross-section of another embodiment of FIG. production of a customizable sheet according to the invention, after localized refining, having a W-shaped profile, - Figure 3D illustrates a cross section of an embodiment of the invention. a customizable sheet according to the invention, after localized refining, having an S-shaped profile; - FIG. 4A illustrates a customizable sheet according to the prior art; FIG. 4B illustrates an embodiment of a customizable sheet according to FIG. FIG. 5 illustrates an embodiment of a customizable sheet according to the invention, FIG. 6 illustrates an embodiment of a customizable sheet according to the invention comprising line-shaped recesses of FIG. 7B, FIGS. 7A to 7G each illustrate an embodiment of a recess whose shape has a direction of elongation parallel to the fold line 40, and FIGS. 8A to 8J each illustrate an embodiment of an area of machining according to the invention after a localized ablation step.

DETAILED DESCRIPTION

An embodiment of a security booklet 10 according to the invention is illustrated in FIG. 1A and in FIG. 1B.

The booklet includes a set of individual sheets and a cover 20 superimposed.

The cover 20 is folded in half along a median fold line and covers all of the individual sheets. The fold line is merged with a seam line, so the fold line and the seam line have the same reference number 40.

With respect to the seam line 40, it is expected to define 240 a fold zone ZP. The folding zone ZP can be defined as the portion of a sheet whose distance to the seam line 40 is smaller than a threshold value. In practice, the folding zone ZP is at least the part of a sheet which undergoes flexion when it is folded, in particular in a booklet.

Preferably, the seam line 40 is the median of the folding zone. With Ep the total thickness of the booklet (without the cover), one preferably chooses a folding zone of width greater than or equal to Ερ * π / 4.

Each individual sheet 30 is folded in two along a median fold line, so as to create two sheets of substantially identical dimensions and corresponding to the dimensions of the cover 20.

The cover 20 and the individual sheets are sewn together using a linear seam. A stitch zone ZC extends along the sewing line 40.

Typically, the individual sheets are made of paper. They can be pre-printed, and are most often used for writing, marking or inscriptions (stamps, etc.), for example for visas when the booklet is a passport.

The booklet also includes a customizable page separate from the cover intended to support individual information, typically the name, the first name, the address, a photograph, etc. the holder of the booklet. The customizable page may also be intended to support information relating to the issuer of the booklet, typically the state. Finally, a customizable page may also support at least one security element, for example chosen from the set comprising: optical security elements (hologram or other), watermarks, security printing, RFID chips, etc.

To ensure the security of the individual information, the customizable page is stiffened, in a manner known per se, with a plastic-based material and then processed according to any one of the embodiments below.

In a first embodiment, the customizable page comprises a sheet of paper on which is deposited a layer of transparent plastic material.

According to a first variant, the paper sheet is cellulosic fiber, and the paper is said to be "natural".

According to a second variant, the sheet of paper is made of synthetic paper, in this case in Teslin (registered trademark).

For the sake of brevity, the two variants are confused and the paper, whether synthetic or natural, has the same reference numeral 71.

In this first embodiment, whatever the paper variant, the plastic-based material is advantageously a transparent plastic polymer film 72, preferably polyethylene terephthalate (PET), polystyrene (PS) or polypropylene ( PP).

Preferably, the transparent plastic polymer film covers said customizable sheet 100 in its entirety, typically by a step of depositing a continuous layer (film) of transparent plastic material on the customizable sheet 100, for example by an operation. rolling.

For example, the transparent plastic polymer film is laminated on the sheet of paper, the rolling being made in large boards or coils.

Preferably the transparent plastic polymer film and the personalization layer are in the form of coils.

The transparent plastic polymer film is secured to the paper sheet either by a step 300 of depositing a layer of adhesive (typically a film of 15 μm to 100 μm thick preferably 25 to 60 μm) between the sheet of paper. paper and said transparent plastic polymer film; or, when the paper is natural, by a step 310 consisting in impregnating the cellulose fibers of the paper of the sheet of paper with an adhesive before the film is deposited (1 to 10 g / m 2, preferably 2 to 5 g / m 2 ), step 310 being more generally consisting of coating one of the adhesive materials. In particular, step 310 may consist of coating the transparent plastic polymer film with adhesive.

Preferably the adhesive layer is chosen so as to obtain an irreversible bonding. Advantageously, two-component adhesives or adhesives which can be crosslinked under hot conditions or under radiation such as UV radiation are chosen.

Preferably, said customizable sheet 100 has at least one of: - said paper sheet 71 forming the customizable page has a basis weight between 40 and 150 gr / m2, and preferably between 80 and 110 gr / m2; the transparent plastic polymer film present on the personalization page: outside the machined zone ZU (described later) a thickness of between 150 μm and 500 μm, and preferably between 200 μm and 500 μm; and in its machined zone ZU, after a localized refining step 234 consisting in reducing the thickness of the plastic-based material, a thickness less than or equal to 100 μm, and preferably less than 60 μm; and the customizable sheet 100 supporting the customizable page and the transparent plastic polymer film in contact with said paper sheet have a total thickness of between 200 and 900 μm, and preferably between 250 and 500 μm.

Preferably, the transparent plastic polymer film 72 has on the customization page a thickness h between a minimum value hmin and a maximum value hmax (see for example Figure 3C). The thickness h is substantially constant and equal to hmax outside the machining zone ZU, outside the optical marking zone and outside the tactile marking zone (defined later), and variable according to the predetermined profile in the machining zone ZU.

Preferably, hmin is greater than or equal to 50 μm and hmax is less than or equal to 800 μm and preferably 50 μm <hmin <100 μm. The addition of a transparent plastic polymer film to a sheet of paper makes it possible to increase the flexural rigidity of said sheet of paper, thus of the customizable sheet 100 comprising said sheet of paper. The machining 230 of the plastic-based material parallel to the fold line in the folding zone locally reduces the rigidity of said material, thus closing the booklet. In addition, the invention makes it possible to manufacture a customizable sheet in a single block, without the need to manufacture a sandwich. The machining 230 and its variants are described later in the chapter "machining".

The flexural stiffness D is a resultant of the thickness of the plastic-based material, and the Young's modulus in the form:

Where: - v is the Poisson's ratio, - he, is the thickness of the layer of the plastic-based material (~ 150 - 500 μm), and - E is the Young's modulus.

Typically, for PET the values in the table below are:

The machining makes it possible to reduce the bending stiffness of the layer of plastic-based material by at least one and preferably at least 2 orders of magnitude.

Furthermore, the realization of a customizable page with a paper support advantageously allows to preserve paper-specific security elements, in particular: - the inkjet printability, - at least one watermark observable by transparency, - a set of printed offset, intaglio or screen-printing safeties, - solvent-sensitive inks, - fluorescent fibers or other specific particles incorporated in the paper, - other markers, - at least one safety thread, - an optically variable component such as a hot-marked hologram, - a holographic laminate which is applied after the entry of the personal data so as to protect them from any malicious external attack or simply linked to wear. - etc.

In a second embodiment, the customizable page is made entirely of plastic-based material, for example polycarbonate, or a plastic.

In this case, the customizable page does not include paper and the individual information is printed directly on the plastic-based material, for example by inkjet printing or by re-transfer for materials having a printable surface, or by laser carbonization of one or more layers sensitive to light radiation, or any other laser attack (ablation, or activation) in the mass, according to the sensitivity of the layers, for plastic-based materials (eg polycarbonate).

In this embodiment, the machining principle of the layer of plastic-based material is identical to that described above for the first embodiment, so this embodiment is not illustrated.

The production of a customizable sheet with a plastic-based material such as for example polycarbonate makes it possible to preserve the security elements peculiar to this type of material.

Preferably, a thickness of the plastic-based material which complies with the rigidity parameters mentioned above for the first embodiment is chosen.

Preferably, the dimensions and the thickness of the pages of the booklet comply with ICAO standards.

Preferably, the plastic-based material has on the customization page a thickness h between a minimum value hmin and a maximum value hmax. The thickness h is substantially constant and equal to hmax outside the machining zone ZU, outside the optical marking zone and outside the tactile marking zone (defined later), and variable according to the predetermined profile in the machining zone ZU.

As for the first embodiment, preferably hmin is greater than or equal to 50 μm and hmax is less than or equal to 800 μm and preferably 50 μm <hmin <100 μm.

As for the first embodiment, the customizable page preferably has a total thickness (paper and adhesive included) of between 200 and 900 μm, and preferably between 250 and 500 μm.

Whatever the embodiment (customizable sheet with paper or without paper), it is therefore expected to produce a customizable sheet 100 stiffened with a plastic-based material.

On the customizable sheet 100 produced, it is intended to define 220 a fold line and a fold zone ZP; the folding line of the customizable sheet 100 being intended to be common with the fold line of the individual sheets and the cover 20 of the booklet, the fold zone ZP encompassing the sewing area ZC.

Machining

It is planned to machine 230 locally said plastic-based material in a machining zone ZU, parallel to the fold line in the folding zone; that is, machining the transparent plastic polymer film in the first embodiment, and directly machining the plastic-based material in the second embodiment.

The machining zone ZU is at least equal to the folding zone ZP (see FIG. 5) and may comprise the marking zone ZM. The machining step 230 comprises for example a mechanical machining, for example by any conventional machining tool, milling cutter, grooving or lacerating machine or by abrasion or ablation tools. Mechanical machining has the advantage of being efficient and fast. As an alternative, or in combination, laser machining may be provided, which has the advantage of making it possible to sculpt a profile 90 more sharply than mechanical machining, in order to optimize the mechanical strength versus the bending characteristics of the page. customizable, in particular by producing a discontinuous profile in the direction parallel to the sewing thread of the booklet. The laser machining step may be performed either by infra-red emitting lasers commonly used in laser marking or laser ablation, such as CO 2 lasers, or by excimer lasers or other emitters emitting in the laser. UV (<= 400nm) which corresponds to absorption wavelengths of plastics such as PET.

In addition, a laser machining of the plastic-based material makes it possible to produce an identifiable texture in a tactile and / or visual manner. This texturing can for example be unique for a given series of documents (booklets). The laser machining also makes it possible to integrate personalization elements (for example a numbering or optical / tactile marking described later).

Preferably, it is expected that the plastic-based material is machined locally parallel to the fold line according to a predetermined profile 90.

According to a first variant, the machining step 230 comprises a localized refining step 234, consisting of locally reducing the thickness of the plastic-based material.

For example, the plastic-based material has, in cross-section in the fold zone ZP, a W-shaped (FIG. 3A), U-shaped (FIG. 3B, FIG. 5), W-shaped profile (FIG. FIG. 3C) or in undulations (FIG. 3D), that is to say in series of S.

FIG. 3A illustrates a simple profile 90, in the shape of an L, whose two branches of L can be perpendicular to each other or not.

FIG. 3B illustrates a profile 90 in the shape of a U whose branches of the U can be of substantially the same height or different height. In this case, one of the branches of the U has a height equal to hmax and the other branch has a vertex 91 whose height h is in hmin and hmax. As for the L-shaped profile, the branches of the U may or may not be perpendicular to the base of the U.

The fold line, therefore the seam 40 being made in the hollow of the profile 90 U, the U-shaped branch located on the side of the small sheet (defined below) advantageously has a vertex 91 which strengthens the resistance tearing of the customizable page, that is to say that the customizable page can not leave the book even if the sewing area is partially deteriorated. In this case the customizable page is the large sheet (defined below).

FIG. 3C illustrates a profile 90 in the shape of a W. Such a profile 90 has a set of peaks 91, in this case one of which is in the center of the profile 90, which amounts, on the basis of the profile to U of Figure 3B, to add a second vertex (for example a central reinforcement) whose height h is preferably lower than that of the first vertex (that is to say, that of the U-branch).

Preferably it is planned to position the fold line, thus the seam 40, along said central reinforcement, which makes it possible to compensate for the fragility introduced by the perforation of the seam, without compromising the flexibility qualities of the customizable page. This type of 90 W profile can also have advantages in the case of a thick passport booklet (typically comprising at least 48 pages) to mark the square back of said booklet.

FIG. 3D illustrates a profile 90 in the form of undulations, that is to say a succession of S, whose height h of each vertex 91 can be substantially the same (and in this case equal to hmax, the thickness of the layer of plastic-based material) or different.

For the embodiments illustrated in FIGS. 3A, 3B, 3C and 3D, the machining is done in the length of the fold line with a profile of constant shape along the fold line. Thus, in three dimensions, the machined profile is in the form of a set of at least one groove, each groove having an axis of elongation parallel to the fold line and whose length is equal to that of the page. customizable.

Alternatively, the 3D profile may have discontinuities to create elastic reinforcements between the blades of material.

According to a second variant, the machining step 230 comprises a localized ablation step 233, which consists in creating through-holes in the thickness of the plastic-based material.

In this case, the plastic-based material present locally, in a top view in the folding zone ZP, a profile 90 having a set of contiguous recesses whose shape of each recess has a direction of elongation parallel to the line. folding 40.

For example, various (non-exhaustive) shapes of recesses are illustrated in FIGS. 7A-7G, in which the solid lines represent the recesses in the plastic-based material, all oriented with respect to the same fold line 40.

Figure 7A shows an inverted double cross shape; Figure 7B shows a set of parallel lines; Figure 7C shows a wave; Figure 7D shows hooks; Figure 7E shows inverted keels; FIG. 7F represents a honeycomb and FIG. 7G represents a triangle, in this case equilateral.

When the recesses are contiguous and arranged parallel to each other, the machining zone ZU has a shape illustrated in FIGS. 8A to 8J. Fig. 8A illustrates a machining area with recesses of Fig. 7A; Fig. 8B illustrates a machining area with recesses of Fig. 7B; Fig. 8C illustrates a machining area with recesses in Fig. 7C; Figure 8D illustrates a machining area with recesses of Figure 7D; Fig. 8E illustrates a machining area with recesses of Fig. 7E; Figure 8F illustrates a machining area with recesses in Figure 7F; Figure 8G illustrates a machining area with recesses in Figure 7G; Figure 8H illustrates a machining area with individual diamond-shaped recesses; Figure 81 illustrates a machining area with individual cross-shaped recesses; and Figure 8J illustrates a machining area with individual recesses in the form of other triangles.

An example of a customizable sheet according to the invention is illustrated in FIG. 6 comprising the cut-out recesses of FIG. 7B. Figure 6 is not to scale.

Optical marking

It is also possible to provide a laser optical marking step 231 of the plastic-based material in a marking zone ZM, outside the folding line and distinct from the folding zone ZP, for example to register an identifier (92). visible to the eye or readable by an optical sensor. The optical identifier 92 is preferably disposed on the small sheet 80 (defined below) customizable. For example, as illustrated in FIG. 5, the optical identifier 92 is disposed in the machinable zone ZU, outside the folding zone ZP.

Touch Marking

Advantageously, locally refining the thickness of said material outside the fold line also makes it possible to create a tactile identifier (not shown) by tactile marking, that is to say creating a deep relief that can notably be read by an optical sensor or palpated by a mechanical probe.

Advantageously, the laser machining outside the fold line also makes it possible to create reinforcements orthogonal to the fold line and the (x) main groove (s).

Example

For the customizable sheet 100 or an individual paper sheet 30, the part of the sheet located on one side or the other of the fold line is defined by sheet.

Advantageously here, provision is made to position the fold line on the customizable sheet 100 so that one of the sheets is larger than the other.

In particular, the individual sheets have two sheets 50, 60 of substantially identical dimensions, substantially corresponding to the dimensions of the sheets of the cover 20 of the booklet; that is, the height H and the width L of each sheet of each individual sheet 30 is substantially identical to the height H and the width L of each sheet of the cover 20, respectively (FIG. 4A).

It is preferably provided that one of the sheets of the customizable sheet 100, called "large sheet" 70, has dimensions substantially identical to one of the sheets of the cover 20 of the booklet, that is to say that the height H and the width L of the customizable sheet is substantially identical respectively to the height H and the width L of each sheet of the cover 20 (Figure 4B).

From a customizable sheet of dimensions greater than those of the cover, it is possible to provide a step of cutting the booklet in the format of the cover, preferably after sewing. Preferably, it is expected that the dimensions of the closed booklet comply with ICAO standards, in this case 125 x 88 mm.

Advantageously, it is expected that the other sheet of the customizable sheet 100, called "small sheet" 80, has a height H substantially identical to the height H of each sheet of the cover 20, but has a width Lp much smaller than the width L of each sheet of the cover 20 (Figure 4B).

"Very low" means that the width of the small sheet is less than a predetermined threshold value of the order of 5 to 20 mm, preferably around 10 mm. The width of the large sheet is in turn of the order of 90 mm.

In particular, it can be provided that the width of the small sheet is determined so that it can not be grippable.

The large sheet and the small sheet can be obtained from a customizable sheet whose dimensions are provided for this purpose, so that only the position of the fold line 40 allows to define said large sheet and said small sheet. One can also provide (possibly in combination), a cutting step of the customizable sheet, in particular the small sheet.

It is also possible to provide a customizable sheet in the form of double-page customizable stiffened.

One can provide a step of cutting the customizable sheet 100 to the dimensions of the booklet, preferably performed after the machining step.

Note that the profiles shown in the figures are illustrated with angular shapes. It goes without saying that they are only principles and that they can present roundings instead of illustrated edges.

Nomenclature 10 security booklet 20 cover 30 individual sheet 40 Sewing / folding line 50 leaflet of a single leaflet 60 leaflet of an individual leaflet 70 large leaflet of a customizable leaflet 71 sheet of cellulosic or synthetic fiber paper 72 film of transparent plastic polymer 80 small sheet of a customizable sheet 90 Machining profile 91 top 92 identifier 100 customizable sheet ZU machined area, ZM folding area ZP marking area Folding area ZC Sewing area H Booklet height L Width of the sheet booklet 210 Producing a stiffened customizable sheet with a plastic-based material 220 Define a fold line on the customizable sheet

Locally machining said plastic-based material parallel to the fold line in the folding zone 231 Optical marking so as to create an optically-identifiable mark 232 Touch marking so as to create a tactile identifier 233 localized ablation step 234 step of localized refining 240 Define a folding area on the customizable sheet Place a continuous layer of clear plastic material on the sheet of paper Place an adhesive film between the sheet of paper and the 300 clear plastic material

Impregnate the cellulosic fibers with an adhesive or coat the plastic film with an adhesive layer

Claims (12)

A method of processing a customizable sheet for a security booklet comprising a set of individual pages of the same dimensions, the method comprising the steps of: producing (210) a customizable sheet stiffened with a plastic-based material, and defining (220) a fold line on the customizable sheet, the customizable sheet comprising a customizable leaflet and a non-customizable leaflet arranged on each side of the fold line, the customizable leaflet comprising a customizable page of the same dimensions as the individual pages and intended to include individual information relating to the holder of the booklet, characterized in that it further comprises the steps of: - defining (240) a folding zone on the customizable sheet, and - machining (230) locally said plastic-based material parallel to the fold line in the fold zone according to a predetermined profile. The method of claim 1, wherein the machining step (230) comprises at least one of: - A localized ablation step (233) of creating through holes in the thickness of plastic-based material, - line localized refining step (234), consisting in reducing the thickness of the plastic-based material, - a combinational step (235) of localized ablation and localized refining of the material to plastic base. 3. A method according to any one of the preceding claims, further comprising at least one of: - an optical marking step (231) of locally marking said plastic-based material outside the folding zone. machining said material according to a first predetermined pattern so as to create an optically identifiable mark; and a touch marking step (232) of locally marking said plastic-based material outside the folding zone by machining said material in a second predetermined pattern so as to create a tactile identifier. 4. Method according to claim 3, wherein at least one of the steps of the step (231) of optical marking and the step (232) of tactile marking is implemented on the non-customizable sheet. A method according to any one of the preceding claims, wherein at least one of the steps of the machining step (230) parallel to the fold line, the optical marking step (231) and the step (232) of tactile marking comprises mechanical machining or laser machining. The method according to any one of the preceding claims, further comprising a step of: - Sizing the customizable sheet so that the non-customizable sheet of the customizable sheet has the same height as the customizable sheet and has a width less than that of said customizable sheet. A method according to any one of the preceding claims, wherein the customizable sheet comprises a cellulosic fiber paper sheet, the method comprising a step of: - Depositing (290) a continuous layer of transparent plastic material on the cellulosic fiber paper sheet, and prior to the deposition step (290), at least one of the following steps: - Depositing (300) an adhesive film between the cellulosic fiber paper sheet and the material based on clear plastic, and Impregnate (310) the cellulosic fibers of an adhesive or coat the clear plastic-based material with an adhesive layer. 8. Customizable sheet (100) for security booklet (10) comprising a set of individual pages of the same dimensions, the sheet being stiffened with a plastic-based material and capable of being manufactured by a method according to any one of preceding claim, the sheet comprising: - a fold line (40), the customizable sheet comprising a customizable sheet (70) and a non-customizable sheet (80) arranged on either side of the fold line (40), the customizable sheet (70) comprising a customizable page of the same size as the individual pages and intended to include individual information relating to the holder of the booklet, and - either a plastic-based material, - a sheet of cellulosic fiber paper and a continuous layer of transparent plastic material adhered by a layer of adhesive to said cellulosic fiber paper sheet; or a sheet of synthetic paper, made of a plastic-based material, characterized in that it further comprises: - a folding zone (ZP) in which said plastic-based material present locally, parallel to the line of folding (40), a predetermined profile obtained by machining said plastic-based material. 9. Customizable sheet according to claim 8, wherein said plastic-based material locally present in the folding zone (ZP) at least one of: - in cross-section, an L-shaped profile, of U , S or W - in plan view, a set of contiguous recesses whose shape has an elongation direction parallel to the fold line (40). Customizable sheet according to any one of claims 8 or 9, wherein the plastic-based material is selected from the group consisting of: - polycarbonate, - polyethylene terephthalate (PET), polystyrene (PS) , or Polypropylene (PP). 11. Customizable sheet according to any one of claims 8 to 10, having - outside of the folding zone, a total thickness between 150 pm and 900 pm, and preferably between 200 and 500 pm, and in the folding zone, a thickness of between 50 μm and 300 μm. 12. Safety booklet comprising a customizable sheet according to any one of claims 8 to 11.