Tamper-evident package and manufacturing method

Abstract

Pre-cut sheet for producing a packaging with an anti-tamper device by folding comprising: - a set of hinged panels configured to form faces of said packaging, - a set of closing flaps to form closures of said packaging, - at least one anti-tamper device configured to irreversibly seal a first closure of said packaging, said at least one anti-tamper device comprising at least one foldable tab, said tab being configured to be inserted into a corresponding slot to irreversibly seal said first closure of said packaging by elastic return and blocking in said slot, - at least one reversible closing device with opening indicator to reversibly seal a second closure of said packaging.

Description

[Technical field

[0001] The present invention relates to tamper-proof packaging. In particular, it relates to packaging cases which offer the possibility of preserving the integrity of their contents or of being able to effectively attest to openings or attempted openings. Such packaging or packaging cases may also allow subsequent opening and closing operations to be authorized.

[0002] The invention has applications in the cosmetic, food, pharmaceutical and other fields. Technological background

[0003] In a number of applications, packaging manufacturers must provide the ability to have a tamper-evident system to determine whether the packaging has been opened or tampered with since leaving the packaged product manufacturer's facility, so as to ensure the authenticity of the packaging contents.

[0004] There are different types of packaging with anti-tampering systems that allow you to know if a closed package has already been opened.

[0005] The first category of packaging includes cases sealed with adhesives such as chemical glue or an adhesive label. This type of packaging has the advantage of allowing a very wide variety of solutions for opening the cases. However, the anti-tampering system is highly dependent on the adhesive used for the initial closure of the case. The use of quick-setting glue required for mass production can in certain cases allow the case to be opened without leaving any visible trace of tampering.

[0006] A second category of packaging includes cases that do not require the use of adhesive means for initial closure. Document BE410524 discloses a box obtained by folding and provided with a locking member having S-shaped, expandable folding tabs cooperating with an opening provided at the bottom of a fold arranged inside the box. The folding tabs are passed through the opening and, once the opening is crossed, they deploy so that the locking member can no longer cross the opening again in the opposite direction. However, the manufacture of this box requires a large number of folding and gluing operations. It is also not compatible with a reversible opening / closing system, which can remain useful once the anti-tampering device has been legitimately opened and destroyed.Finally, the folding method of the folding tabs requires great precision in folding because they must fold to the exact size of the opening, otherwise the box cannot be closed or closed incorrectly, thus compromising the objective of tamper-evident protection. Mass production of this type of box is therefore not feasible.

[0007] A third category of packaging includes boxes that use the elasticity of the cardboard to create the locking member. In this type of packaging, the tab has a harpoon shape that deforms to enter an opening and is locked there once its initial shape is restored. Examples of this type of packaging are described in documents EP2036821A1, EP1820740A1, EP0519389A1, EP2239203A1, US2008308619A1, FR2847555A1, EP3406533A1, for example. In these examples, the tab fins are not foldable. Thus, the closure of the packaging does not offer a guarantee of inviolability and it is sometimes possible to carry out manipulations or deformations at the level of the closing flaps and / or the closing panel to prevent the triggering of the anti-tampering system.

[0008] None of the prior art packaging types offers a completely satisfactory solution.

[0009] There is therefore a need for packaging that offers the possibility of preserving the integrity of its contents and of being able to effectively attest to openings or attempted openings, while allowing great flexibility in terms of the type of opening. In addition, there is also a need for packaging whose anti-tampering system does not alter subsequent opening and closing operations after initial opening by destroying it.

[0010] The present invention falls within this framework. Summary of the invention

[0011] According to a premier aspect, the invention relates to a pre-cut sheet for producing packaging with an anti-tamper device by folding comprising: a set of hinged panels configured to form, after folding, faces of said packaging, a set of closing flaps extending from said panels and configured to form, after folding, closures of said packaging, at least one anti-tamper device configured to irreversibly seal a first closure of said packaging, said at least one anti-tamper device comprising at least one tab foldable along a first fold line, from which extends at least one fin foldable along a second fold line, said tab being configured to be inserted, after folding said first and second fold lines, into a corresponding slot to irreversibly seal said first closure of said packaging by elastic return of said fin along said second fold line and blocking in said slot,at least one reversible closing device with opening indicator for reversibly sealing a second closure of said packaging.

[0012] For example, said second fold line forms, from the first fold line, an angle less than 90 degrees

[0013] According to embodiments, said tab has an insertion width less than or equal to a width of said slot when said at least one fin is folded along said second folding line.

[0014] For example, said second fold line forms, from the first fold line, an angle greater than 20 degrees.

[0015] For example, said first fold line comprises a zone of weakness causing said tab to be torn off beyond a force threshold applied to said zone.

[0016] According to embodiments, at least one closing flap from which a locking flap extends allows reversible locking of said packaging after breaking of said anti-tampering device.

[0017] For example, said slot is made at a fold line between a hinged panel of said assembly and a closing flap extending from said panel.

[0018] For example, said slot is made at a fold line between said flap and said flap.

[0019] According to embodiments, said fin extends beyond a tab body in a direction of insertion into said slot and forms a profiled insertion edge of said tab into said slot.

[0020] For example, a tab body extends beyond said fin in a direction of insertion into said slot and has a profiled insertion edge of said tab into said slot.

[0021] For example, said fin is located at a distance from said first line, in a direction of insertion of said tab into said slot, greater than a thickness of said sheet.

[0022] For example, said tab comprises a trapezoidal portion with a first segment formed by said first fold line and a second parallel segment of greater length than said first side.

[0023] For example, at least one panel comprises a weak zone configured to be irreversibly perforated to allow the opening of said packaging, once the anti-tampering device is inserted into said slot.

[0024] For example, said tab extends from a closure flap of said set of closure flaps.

[0025] For example, said closing flap from which said tab extends has at least one weak zone allowing it to be torn off at least in part.

[0026] For example, said tab extends from a hinged panel of said set of hinged panels.

[0027] For example, said hinged panel from which said tab extends has a flexibility opening allowing said tab to be moved away from said hinged panel for insertion into said slot.

[0028] According to a deuxième aspect, The invention relates to a package with an anti-tamper device obtained by folding a sheet according to the first aspect.

[0029] According to a troisième aspect, The invention relates to a method for manufacturing a pre-cut sheet for producing packaging with an anti-tamper device by folding, comprising the following steps:

[0030] - cutting out a template comprising a set of panels to form faces of said packaging, a set of flaps to form closures of said packaging, a tab and at least one fin to form an anti-tampering device of said packaging to irreversibly seal a first closure of said packaging, and at least one reversible closure device with opening indicator, production of fold lines between said panels to allow their articulation, production of fold lines between said panels and said flaps to allow their closure, production of a first fold line of said tab and a second fold line of said fin to allow the formation of said anti-theft device, production of an insertion slot configured to receive said anti-theft device and to allow irreversibly sealing a closure of said packaging by elastic return of said fin along said second fold line and blocking in said slot.

[0031] According to a quatrième aspect, The invention relates to a method for manufacturing a package with an anti-tamper device by folding comprising the following steps: obtaining a sheet according to the first aspect, folding said panels along fold lines between said panels, folding said flaps along fold lines between said flaps and said panels, folding said at least one fin along the second fold line, folding said at least one tab along the first fold line, inserting said tab into said slot. Brief description of the figures

[0032] Other characteristics and advantages of the invention will appear on reading the following detailed description, by way of non-limiting example, and the appended figures, among which: [ Fig. 1 ] illustrates the principle of elasticity used for the production of fins according to embodiments, [ Fig. 2 ] illustrates an irreversible lock according to embodiments, [ Fig. 3 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 4 ] illustrates a tab according to embodiments, [ Fig. 5 ] illustrates a tab according to embodiments, [ Fig. 6 ] illustrates a tab according to embodiments, [ Fig. 7 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 8 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 9 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 10 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 11 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 12 ] illustrates a method according to embodiments, [ Fig. 13 ] illustrates a method according to embodiments, [ Fig. 14 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 15 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 16 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 17 ] illustrates a tab according to embodiments, [ Fig. 18 ] illustrates a pre-cut sheet according to embodiments, [ Fig. 19 ] illustrates a tab according to embodiments.

[0033] In the following, embodiments of a package with an opening indicator are described. This is, for example, a packaging case. According to these embodiments, these packages are obtained from a pre-cut sheet or " flan » pre-cut. The packaging is then assembled by folding the sheet. The sheet includes a system of panels and flaps. It also includes a reversible closure device with an opening indicator. This means that when the packaging is opened for the first time using this reversible closure device, an opening indicator present on the packaging and visible from the outside allows this to be confirmed. The closure device is reversible because it allows the box to be closed again on demand (after re-closing, the opening indicator allows it to be determined that the packaging has already been opened). This reversible closure allows the packaging to be opened and re-closed legitimately because the opening indicator allows the first opening to be confirmed. The packaging also includes an anti-tamper device formed by tabs with folding fins to ensure irreversible closure of the case.The destruction of the anti-tampering device during a first opening testifies to this. Here, this closure is not reversible and does not include an opening indicator because it aims to prevent any unauthorized opening, i.e. other than that provided with an opening indicator. This closure prevents any fraudulent manipulation of the packaging to change the contents without triggering the opening indicator. Any opening of a closing flap containing the anti-tampering device results in its destruction, which makes the manipulation visible.

[0034] The packaging can therefore be opened in two ways. The first way is legitimate and expected. It is done by the first reversible closure which can be used for opening and closing. An opening indicator then attests to this first opening. The second way is not legitimate and is not expected. It is therefore not a normal opening of the packaging and is deterred by the fact that to implement it, the associated anti-tampering device must be destroyed. Irreversibly. Thus, any attempt to open the packaging in this way (to avoid doing it by the first way and therefore activating the opening indicator) is deterred because although the opening indicator is not activated, the opening of the packaging will still be detectable by the irreversible destruction of the anti-tampering device.Embodiments thus make it possible to use any type of opening (legitimate, with opening witness) possible for cases and without constraint on subsequent operations of opening and closing the case while guaranteeing the visibility of any discreet opening attempt. The anti-tampering device is irreversible and prevents any reconstruction to mask a first opening other than the legitimate opening with opening witness.

[0035] In the following embodiments, the irreversible locking of the packaging is achieved by using the elasticity of the material forming it. This is generally cardboard. For example, it is a parton of the type " Folding boxboard » in Anglo-Saxon terminology, of the type « GC " Or " UC » according to DIN 19303. As illustrated by the figure 1 , when folding two parts 101 And 102 of a leaf100, for example in cardboard, at 180 degrees (arrow 104 ) along a fold line (or crease) 103 (i.e. one on top of the other) and without damaging the fold, the cardboard immediately reopens at an angle α which may depend on the time for which the pressure was exerted (steps 1, 2 and 3 on the figure 1 ). The opening angle α is usually immediately around thirty degrees and tends to increase over time without ever returning to the initial angle of 180 degrees.

[0036] This property can be used to achieve irreversible locking illustrated by the figure 2 . A tab 200 is made of a material allowing elastic return as described previously. The tongue comprises a tongue body 201 from which one or more fins extend 202, 203.The fins are foldable along respective fold lines, allowing them to be folded down onto the tab body as illustrated by the arrows in the figure 2 ( étape 1 ). Thus, the width of the tab can be temporarily reduced to allow it to be inserted into a slot 204 of lower width ( étape 2 ). The width is measured here in the direction orthogonal to the insertion direction (arrow 206 ) of the tab 200 in the slot 204 . The slot 204 is formed in the body 205 of the packaging. For example, in the illustration of the figure 2 , the slot is made in a fold line between a panel 207 and a closing shutter 208 . Once the folded fins have passed the panel 207 following the insertion of the tab 200 in the slot 204, these are deployed ( étape 3 ). Once the tab is inserted, the fins rest against the panel 207 in the event of an attempt to remove the tab from the slot, which allows for an irreversible closure. In fact, only destruction of the anti-tampering device thus formed allows the packaging to be opened. It is therefore possible to determine whether the box has been opened or attempted.

[0037] The tamper-evident device may be disposed at various positions of the package as illustrated in the following embodiments.

[0038] There figure 3 illustrates a pre-cut sheet 300 according to embodiments. The sheet 300 (Or " flan ") includes a first set of articulated panels 301, 302, 303, 304. The panels can be hinged together along respective fold lines. A fold line separates the panel 301 of the panel 302.A fold line separates the panel 302 of the panel 303. A fold line separates the panel 303 of the panel 304. A collage strip 305 extends from the panel 301 from a fold line which also allows it to be articulated in relation to it. The articulated panels, once folded along the respective fold lines, form the walls of the package. The sheet also has a second set of closing flaps 306, 307, 308, 309, 310, 311. Closing flaps extend from a respective hinged panel from a fold line. The flaps 307 And 311 extend on each side of the panel 302 (the sides not shared with an adjacent panel) from respective fold lines while the flaps 309 And 308 extend on each side of the panel 304(the sides not shared with an adjacent panel) from respective fold lines. The flap 306 extends from one side of the panel 301 (the side opposite the tab 315 ), from a fold line while the flap 310 extends from one side of the panel 303 (the side opposite the tab 314 ), from a fold line. The closing flaps, once folded along the fold lines, form closures of the package. The flaps 306, 307 And 308 form a first closure, on one side of the packaging. The flaps 311, 310 And 309 form a second closure, on the other side of the packaging. Once the packaging is made by folding the panels and flaps, it has a parallelepiped shape. In addition to folding the panels and flaps, the gluing strip 305 is glued to the panel 304.

[0039] To allow reversible opening and closing, the shutters 306 And 310 are provided with respective locking flaps 312 And 313. These flaps extend from the flaps from fold lines that allow them to fit against the opposing panels and thus close the package while cooperating with the other flaps of the adjacent panels. The flap 312 fits against the panel 303 and cooperates with the shutters 307, 308 while the flap 313 fits against the panel 301 and cooperates with the shutters 309, 311. Each flap has a cutout at each end 316, 317which allows it to be located, on these ends, at a distance from the flap from which it extends. Each flap thus has two extreme cutouts, which give it a harpoon shape and which facilitate the locking of the flap, once the packaging is assembled. These cutouts cooperate with the adjacent closing flaps which do not have a flap. Thus the cutouts 316 cooperate with the shutters 308 et 307 while the cutouts 317 cooperate with the shutters 309, 311.

[0040] In this embodiment, a tab 314 extends from the panel 303. Another tab 315 extends from the panel 301. These tabs have a shape as described above with reference to the figure 2 , with each having fins extending on either side of a tongue body to form anti-tamper devices. Each of the devices cooperates with a respective slot. A slot 318is made in the fold line between the flap 312 and the shutter 306. The tongue 314, once the fins are folded, can be inserted into it. A slot 319 is further carried out in the fold line between the flap 313 and the shutter 310. The tongue 315, once the fins are folded, it can be inserted into it.

[0041] In order to give flexibility to each tab and make it easier for a user to close the anti-theft device, flexibility openings can be created on the panel from which the tab extends. The flexibility opening can take different shapes (rectangular, trapezoidal or other). For example, the tab 315 extends from the panel 301 from a fold line 320. The opening of flexibility 321 is in the example of the figure 3 formed on the panel 301and has a rectangular shape. The opening 321 is delimited by a line 322 parallel to the line 320 and two other perpendicular lines 323 connecting the line 320 to the parallel line 322. These perpendicular lines 323 are pre-cut, allowing a user to move the tab away from the slot 319 and insert it. This spreading movement is facilitated by the fact that the line 322 is a line of least resistance that can be broken to allow the box to be opened while leaving an opening indicator.

[0042] For the purpose of allowing the first opening of the device, with an opening indicator, the line 322 can in fact be broken and thus prevent the opening from being blocked by the tab. Once this is broken, the tab can be torn off the panel 301and the anti-theft device no longer blocks the opening of the closing shutter (the shutter 310 for the tab 315 and the shutter 306 for the tab 314 ). The packaging can still be opened and closed on demand using the locking flap. 312 Or 313. The line 320 also has a weakness to prevent any attempt to remove the tab and thus also acts as an anti-theft device. It also allows easy removal of elements of the anti-theft system that have become useless after the first opening by breaking the line 322.

[0043] The packaging thus has a first reversible closure (the flap 310 with its flap 313 or the shutter 306 and its flap 312 ) whose first opening is attested by the perforation of the opening 321 by breaking the line 322(or the corresponding opening and line for the shutter 306 ). It also has a second irreversible closure (the insertion of the tab 315 in the slot 319 or the tab 314 in the slot 318 ). This closure is irreversible because any opening of it (without perforating the opening and therefore activating the opening indicator) requires breaking the line 320 (or the corresponding line for the tab 314 ) and this rupture is not repairable.

[0044] There figure 4 illustrates in more detail a tab according to embodiments. The tab 400 has a tongue body 401 and one or two fins 402, 403.Two fins may be preferred, but a single fin may be sufficient to ensure the locking of panels and flaps. A single fin may, for example, be used for small packages requiring a small tab. The lines a-b and d-c are fold lines (or creases) that allow the fins 402 And 403 to be folded over the tongue body. The angles α And β are the angles formed between, on the one hand, the fold lines of the fins relative to the tongue body and, on the other hand, the fold line e of the tab relative to the panel or flap from which it extends. These angles are strictly less than 90 degrees. They can, for example, be greater than 20 degrees. The angles α And βmay or may not be identical. The width of the fins when folded does not exceed the base of the tab to allow their deployment. The line b-c can be straight, concave, curved or take any other shape. The line e that connects the tab to the adjacent panel or flap is a line with a weakness. This can, for example, be a pre-cut line or a dotted line. If an attempt is made to remove the tab, the force exerted on the weak area will cause it to break, so any attempt to fraudulently open the case will be reported. The distance g between the fins and the fold line of the tab relative to the adjacent panel or flap is adjusted according to the thickness of the material used to manufacture the case so as to minimize the clearance between the wall and the tab after deployment of the fins. The distance fbetween the fins, on the side of the base of the tab is for example the width of the corresponding slot plus or minus 5 mm and is adjusted according to the size of the tab and the shape of the slot. Preferably but not strictly necessary, the distance f is 0.4 to 0.5 mm greater than the slot width.

[0045] The fins and the tongue body may take various shapes. In particular, they may have profiled insertion edges to facilitate insertion into the slot when locking the anti-tamper device. When the tongue body is intended to be inserted first, it may have a profiled shape facilitating insertion of the fins. When the fins are intended to be inserted first, they may have a profiled shape facilitating insertion of the tongue body.

[0046] There figure 5 illustrates a tongue shape according to embodiments. The tongue 500 has a tongue body 501 and two fins 502 And 503. The tab extends from a closure panel or flap of a package (not shown) from a fold line e. The fin 502 extends from the tongue body 501 from a fold line a-b . The fin 503 extends from the tongue body 501 from a fold line c-d. The fin configuration is similar to that described with reference to the figure 4 . So the fold line a-b forms an angle α less than 90 degrees with the fold line e. the fold line c-d forms an angle β less than 90 degrees with the fold line e. The fins 502 And 503 are at a distanceg of the line e in the direction of tab insertion (the direction perpendicular to the fold line e ). The line a-d separating the fins 502 And 503, parallel to the line e has a width f greater than that of the line e itself. Thus, the tongue body 501 is attached to the fold line e by a party 504 trapezoidal in shape.

[0047] In the embodiment of the figure 5 , the fins 502, 503 extend in the direction of insertion of the tab (perpendicular to the line e ) beyond the tongue body 501. So, on the figure 5 , we can see the tongue body 501 delimited by the line b-c in the insertion direction. We can also see the fins extending beyond the line b-c in the direction of insertion. The angles α And β are chosen so that, even when folded on the lines a-b And c-d, the fins 502 And 503 still exceed the tongue body 501, that is to say here the line b-c, and without exceeding the fold line e. The fins 502 And 503 have a profile in the direction of insertion which facilitates its insertion into the slot provided for this purpose. In the present example, the fins have a generally oblong shape in a direction parallel to their respective fold line. The end part of the fins, in the direction of insertion, has an acute angle. All this facilitates the insertion of the tab into the corresponding slot and facilitates the manufacture of the sheet and the packaging. Insertion is facilitated, in particular, by the angles α And βless than 90 degrees, the risks of poor closure are minimized.

[0048] The tabs of the embodiment of the figure 5 may be used, for example, when the corresponding insertion slot for locking the anti-theft device is located between a closing flap and a flap, as illustrated by the figure 3 .

[0049] Other configurations of the tab are possible. Another embodiment is described with reference to the figure 6 . The tongue 600 has a tongue body 601 and two fins 602 And 603. The tab extends from a closure panel or flap of a package (not shown) from a fold line e. The fin 602 extends from the tongue body 601 from a fold line a-b . The fin 603extends from the tongue body 601 from a fold line c-d. The fin configuration is similar to that described with reference to the figure 4 . So the fold line a-b forms an angle α less than 90 degrees with the fold line e. the fold line c-d forms an angle β less than 90 degrees with the fold line e. The fins 602 And 603 are at a distance g of the line e in the direction of tab insertion (the direction perpendicular to the fold line e ). The line a-d separating the fins 602 And 603, parallel to the line e has a width f greater than that of the line e itself. Thus, the tongue body 601 is attached to the fold line e by a party 604trapezoidal in shape.

[0050] In the embodiment of the figure 6 , the tongue body 601 includes a part 604 which extends beyond the fins 602, 603 in the direction of insertion of the tab (perpendicular to the line e ). So, on the figure 6 , we can see the tongue body 601 cross the line b-c in the direction of insertion. The part exceeding this line is a part 605 profiled to facilitate the insertion of the tab into the corresponding slot. This part 605 has cutouts on both sides 606 on a width h in the direction perpendicular to the insertion direction. These cutouts 606 allow the fins to fold correctly 602, 603 according to the fold lines a-b And c-d. The fins 602 And 603have a rounded profile in the direction perpendicular to their fold line. All this facilitates the insertion of the tab into the corresponding slot and facilitates the manufacture of the sheet and the packaging. Insertion is facilitated, in particular, by the angles α And β less than 90 degrees, the risks of poor closure are minimized.

[0051] The tabs of the embodiment of the figure 6 may be used, for example, when the corresponding insertion slot for locking the anti-theft device is located between a closing flap and a panel. Such an embodiment is illustrated by the figure 7 .

[0052] In this embodiment, the tabs extend from closure flaps which are themselves hinged to panels of the packaging. The sheet (or " flan ”) pre-cut 700 includes a first set of hinged panels 701, 702, 703, 704.The panels can be hinged together along respective fold lines. A fold line separates the panel 701 of the panel 702. A fold line separates the panel 702 of the panel 703. A fold line separates the panel 703 of the panel 704. A collage strip 705 extends from the panel 701 from a fold line which also allows it to be articulated in relation to it. The articulated panels, once folded along the respective fold lines, form the walls of the package. The sheet also has a second set of closing flaps 706, 707, 708, 709, 710, 711. Closing flaps extend from a respective hinged panel from a fold line. The flaps 707 And 711 extend on each side of the panel 702 (the sides not shared with an adjacent panel) from respective fold lines, while the flaps709 And 708 extend on each side of the panel 704 (the sides not shared with an adjacent panel) from respective fold lines. The flaps 706 And 710 extend on each side of the panel 703 (the sides not shared with an adjacent panel) from respective fold lines. The closure flaps, once folded along the fold lines, form closures of the package. Additional closure flaps 724, 725 extend on each side of the panel 701 (the sides not shared with an adjacent panel or glue strip) from respective fold lines. Each panel 724, 725 wears a tab 714, 715 respective. The shutters 706, 707, 724 et 708 form a first closure, on one side of the packaging. The flaps 711, 710, 725 et 309 form a second closure, on the other side of the packaging. Once the packaging is made by folding the panels and flaps, it has a parallelepiped shape. In addition to folding the panels and flaps, the gluing strip 705 is glued to the panel 704.

[0053] After a first legitimate opening and to allow reversible opening and closing, the shutters 706 And 710 are provided with respective locking flaps 712 And 713. These flaps extend from the flaps from fold lines that allow them to fit against the opposing panels and thus close the package while cooperating with the other flaps of the adjacent panels. The flap 712 fits against the panel 701 and cooperates with the shutters 707, 708 while the flap 713 also fits against the panel 701but on the other side of the packaging and cooperates with the flaps 709, 711. Each flap has a cutout at each end 716, 717 which allows it to be located, on these ends, at a distance from the flap from which it extends. Each flap thus has two extreme cutouts, which give it a harpoon shape and which facilitate the locking of the flap, once the packaging is assembled. These cutouts cooperate with the adjacent closing flaps which do not have a flap. Thus, the cutouts 716 cooperate with the shutters 707 et 708 while the cutouts 717 cooperate with the shutters 709, 711.

[0054] In this embodiment, a tab 714 extends from the shutter 724. Another tab 715 extends from the shutter 725. These tabs have a shape as described above with reference to the figure 6 ,with each having fins extending on either side of a tongue body to form anti-tamper devices. Each of the devices cooperates with a respective slot. A slot 718 is made in the fold line between the flap 706 and the panel 703. The tongue 714, once the fins are folded, can be inserted into it. A slot 719 is further carried out in the fold line between the flap 710 and the panel 703. The tongue 715, once the fins are folded, it can be inserted into it.

[0055] In this embodiment, the fold line 723 between the shutter 725 and the panel 701 has a weak area. For example, a dotted pre-cut. The flap 725 is therefore removable. This allows the first legitimate opening of the packaging with opening indicator. For the first opening of the packaging, the panel 701has a weak area 721. This area is for example delimited by the line 723 and a pre-cut line 722 dotted. A user can thus perforate the area 721 and tear off the shutter 725 by breaking the line 723 and release the shutter 710 for opening / closing on demand. Any (illegitimate) attempt to open the shutter 725 is made impossible by the presence of the anti-theft device formed by the tab 715. To remove the shutter 725 other than by perforation of the area 712, requires tearing off the tab at the line 720. The pre-cutting line 722 can have various shapes (semicircle, rectangle, trapezoidal or other). The fold line 720 between the tongue 715 and the shutter 725has a weakness to prevent any attempt to remove the tab. Such an attempt would cause the tab to tear off due to the presence of the weakness. This weakness also allows the flap to be removed 725 once the package is opened.

[0056] In this embodiment, the opening / closing of the packaging is only possible from one side of the packaging. In fact, the folding line between the flap 724 who wears the tongue 714 and the panel 701 does not have any weak areas. It is therefore not possible to tear off the shutter 724. Depending on the achievements, it is possible to create a shutter 724 identical to the shutter 725.

[0057] The packaging thus has a first reversible closure (the flap 710 with its flap 713 ) whose first opening is attested by the perforation of the opening 721 by breaking the line722. It also has a second irreversible closure (the insertion of the tab 715 in the slot 719 or the tab 714 in the slot 718 ). This closure is irreversible because any opening of it (without perforating the opening and therefore activating the opening indicator) requires breaking the line 720 (or the corresponding line for the tab 714 ) and this rupture is not repairable.

[0058] Depending on the embodiments, the number of tabs varies, for example, depending on the size of the packaging. For example, for packaging with a wide closing flap, it is possible to provide several tabs on the same closing flap or on the same hinged panel.

[0059] Many variations of the embodiments described above are possible. Some of these variations are briefly described below.

[0060] The embodiment illustrated by the figure 8 is similar to that described with reference to the figure 3 . In addition to the dimensions of the panels and shutters which differ, this sheet 800 has two tabs 801, 802 which extend on either side of the same flap 803.

[0061] The embodiment illustrated by the figure 9 is similar to that described with reference to the figure 7 . In addition to the dimensions of the panels and shutters which differ, as well as the shape of the shutters, this sheet 900 has two tabs 901, 902 which extend from shutters 903, 904 which themselves extend from different panels 905, 906. Furthermore, this time the shutter 903 is removable by the presence of a tear-off strip 907 which forms the junction between the shutter and the panel 905.This strip is delimited by two lines of weakness. One line of weakness is carried by the fold line between the panel 905 and the shutter 903. The other line of weakness is present on the shutter 903, parallel to the other line of weakness.

[0062] The embodiment illustrated by the figure 10 is similar to that described with reference to the figure 9 . In addition to the dimensions of the panels and shutters which differ, as well as the shape and position of the shutters, this sheet 1000 has a tab 1001 which extends from a shutter 1003 which itself extends from a panel 1005. Furthermore, this time the shutter 1003 is partially removable by the presence of a tear-off strip 1007 arranged in a substantially central position in the shutter. This strip is delimited by two lines of weakness parallel to the fold line between the shutter1003 and the panel 1005. When the band 1007 is torn off, only a part 1009 the shutter remains attached to the panel 1005. The line of weakness adjacent to the part 1009 of the pane has a tab 1008 which protrudes from the part 1009 towards the tab and which serves as an insertion point in a recess 1004 made in a shutter 1006 which extends from the panel 1002 and which faces the shutter 1003 when the packaging is shown by folding the sheet 1000. The withdrawal 1004 is a cutout in the shutter 1006. For example, the indentation has a rectangular shape or any other shape whose dimensions allow for insertion of the tab 1008. So the part 1009 of the shutter 1003 with the tab 1008 and the shutter 1006 with withdrawal 1004form a system for opening and closing the packaging on demand, once the anti-tampering device has been destroyed by tearing off the strip 1007.

[0063] The embodiment illustrated by the figure 11 is similar to that described with reference to the figure 9 . In addition to the dimensions of the panels and shutters which differ, this sheet 1100 has two tabs 1101, 1102 which extend from the same shutter 1103. Additionally, two tabs 1104, 1105 which extend from the same shutter 1106. To close the packaging, slots are arranged opposite each tab. This embodiment allows the packaging to be closed properly despite the width of the panels carrying the closing flaps.

[0064] A method of making a pre-cut sheet according to embodiments is briefly described with reference to the figure 12 .In a first step 1201, a sheet template is cut from the material forming the sheet and the future packaging. In some embodiments, this is cardboard or any other material relevant to the field of use of this packaging as already described above. Then, folding lines are made 1202, at the joints of the panels to allow their articulation. The folding lines can be made by pressure. In one step 1203, the fold lines at the joints between the closing flaps and the panels from which they extend are made. These fold lines can also be made by pressure. In one step 1204,the fold lines at the level of the tab and the fin are made. The fold line of the tab is made at the level of the joint between the tab and either the hinged panel or the closing flap depending on the method of realization of the sheet envisaged. Finally, during a step 1205, the slot in which the tab is to be inserted is made at the corresponding location, for example between a closing flap and a hinged panel, or between a closing flap and a locking flap depending on the embodiment envisaged. Other steps (not shown) can also be carried out, such as the creation of the areas or lines of weakness to create the areas or lines of weakness depending on the embodiment envisaged.

[0065] Finally, a method of producing a package according to embodiments is briefly described with reference to the figure 13 . In one step 1301,a pre-cut sheet according to embodiments is obtained. The hinged panels are then folded during a step 1302 to form the body of the packaging. Gluing can also be carried out to close the packaging body, for example by means of a gluing strip as already described. The closing flaps are then in turn folded back during a step 1303. The tab and fin are then folded back to form the anti-theft device during the steps 1304 And 1305. The device thus formed is then inserted into the corresponding slot during step 1306 to seal the packaging. Folding the closing flaps may also include folding the locking flaps when present, as described above.

[0066] The method may further include steps of bonding certain elements of the pre-cut sheet. The use of adhesive when closing the packaging may be useful, for example for aesthetic reasons or to maintain the structure of the packaging after opening. This bonding of panels or flaps is not incompatible with the anti-tampering mechanisms described above. Indeed, even in the event that it would be possible to peel off the panels and / or flaps, the integrity of the packaging will not be compromised because it will not be possible to access the interior without triggering one of the anti-tampering systems of the packaging. The use of adhesive may also be useful when, for example, it is desired that the panel or flap remain in place in order to retain important information present on the panel / flap. This type of information is, for example, a batch number, an expiry date or other. For example, in the example of the figure 7 , it is possible to glue the shutters 725 And 710 sets to keep the shutter 725 which is located outside the packaging, even after destruction of the anti-theft device by breaking the line 723.

[0067] Embodiments of the invention can be adapted to many types of packaging. figure 14 is another illustration. The pre-cut sheet of this variant is similar to that of the figure 7 but with an opening of the type " paquet de cigarette » . The leaf 1400 has panels 1401, 1402, 1403, 1404 as well as a gluing strip 1405. These panels and the gluing strip are hinged together along fold lines. The sheet also has flaps hinged to the panels 1406, 1407, 1408, 1409, 1410, 1411, 1412, 1413. As already described, some shutters have locking flaps 1414, 1415while others wear tabs 1416, 1417 according to provisions already described above and for the same functionalities. For this purpose, the sheet has the necessary slots and openings as already described. In the variant illustrated by the figure 14 , the sheet also has two reinforcement panels 1418, 1419 to strengthen the structure of the packaging and ensure the closing / opening mechanism on demand. This "type" mechanism paquet de cigarette » rests on an opening crossing the panels 1401, 1402, 1403, and a fold line on the flap 1404. The fold line 1420 on the shutter 1404 is located on a higher part of the package than the opening line 1421 which is located in a slightly lower position on the panel 1402. The upper part of the leaf is the one on the opening side (at the bottom of the figure 14 ). Opening lines 1422 And1423 make the connection between the lines 1419 And 1420 on each of the panels 1401 And 1403. Once the packaging is formed from the sheet 1400, the opening is done by breaking the opening lines 1422, 1421, 1423. The cover thus formed by the upper part of the packaging pivots on the folding line 1420. To facilitate opening, a tab 1425 is present on the line 1421. As is also the case with the other embodiments described, opening the packaging by means other than breaking the opening lines is made impossible without irreversible evidence thanks to the tabs. 1417 And 1416. Any attempt to remove the shutters 1409 And 1411 results in the tabs being torn off. To facilitate the reversible closure of the packaging, a slot 1424 is performed on the panel 1418 in correspondence with the nail 1425.Thus, to close (in a visible and therefore non-fraudulent manner) the packaging, it is possible to insert the tab 1425 in the slot 1424.

[0068] The packaging thus has a first reversible closure (the upper part partially detachable along the lines 1422, 1412, 1423 and foldable on the line 1420 )) whose first opening is attested by the detachment of the tab 1425. It also has a second irreversible closure (the insertion of the tab 1417 in the slot 1426 or the tab 1416 in the slot 1407 ). This closure is irreversible because any opening of it (without detaching the tab to open the upper part of the packaging and therefore activating the opening indicator) requires breaking the line 1427 (or the line 1428 for the tab 1416 ) and this rupture is not repairable.

[0069] There figure 15 is an illustration of another variant. The die-cut sheet for this variant is similar to that of the figure 7 but with an opening along the length of the package rather than at one end. The sheet 1500 has panels 1501, 1502, 1503, 1504. These panels and the gluing strip are hinged together along fold lines. The sheet also has flaps hinged to the panels 1506, 1507, 1508, 1509, 1510, 1511, 1512, 1513. Some shutters have tabs 1514, 1515 according to provisions already described above and for the same functionalities. For this purpose, the sheet has the necessary slots and openings as already described. In the variant illustrated by the figure 15 , the leaf 1500does not have a locking flap on any of the closing flaps. In fact, legitimate opening (without destroying the anti-burglary device) does not take place at this level. This opening takes place at the level of the sheet panels. In fact, in this variant, there is no gluing strip provided, but instead, a closing panel 1505, hinged to the panel 1504 along a fold line. This closing panel 1505 has a locking tab 1516 with which it is articulated. This locking tab is able to cooperate with the panel 1501, at a break line 1518 of an opening zone 1517. When assembling the packaging, the flaps 1509 And 1513 are glued together in order to maintain the structure of the packaging once the first (legitimate) opening has been carried out. In addition, to close the box, the panel 1505 is glued to the panel 1501,at the level of an area 1517 delimited by the break line 1518. The first legitimate opening is thus made in a first movement by tearing off the zone 1517 by lifting the panel 1505. In a second movement, the panel 1504 is detached from the shutters 1509 And 1513. This detachment is done by breaking the fold lines 1520 And 1519 which have weaknesses for this purpose. The panels 1509 And 1513 being stuck to the other flaps, these are still in place. Any (fraudulent) attempt to open the packaging by peeling it off is made impossible by the presence of the tabs 1515 And 1514 which would then be torn off. The box is reclosed after legitimate opening by pivoting the panels 1504 And 1505 according to the fold lines between the flaps 1503 And 1504and the fold line between the flaps 1504 And 1505. The tab 1516 is then inserted into the packaging at the line level 1518 of the panel 1501.

[0070] The packaging thus has a first reversible closure (the panel 1505 with its flap 1516 ) whose first opening is attested by the withdrawal of the part 1517. It also has a second irreversible closure (the insertion of the tab 1515 in the slot 1521 or the tab 1514 in the slot 1522 ). This closure is irreversible because any opening of it (without removing the part 1517 and therefore the activation of the opening indicator) requires the line to be broken 1524 (or the line 1523 for the tab 1515 ) and this rupture is not repairable.

[0071] Another variant is described with reference to the figure 16 which is an illustration of it. The pre-cut sheet of this variant is similar to that of the figure 7 in that it comprises one or more closing flaps from which one or more tabs extend. The sheet 1600 has panels 1601, 1602, 1603, 1604 as well as a gluing strip 1605. These panels and the gluing strip 1605 are hinged together along fold lines. The sheet also has hinged flaps 1606, 1607, 1608, 1609, 1610, 1611. Each flap is hinged relative to a respective panel of the sheet. Some hinged flaps have locking tabs 1612, 1613 allowing the corresponding flap to be locked in a closed position when the packaging is made from the sheet. Finally, according to provisions already described above and for the same functions, certain flaps have tabs 1614, 1615, 1616, 1617. For this purpose, the sheet has slits 1618, 1619, 1620, 1621as already described. The tabs are connected to respective closing flaps by fold lines with weaknesses 1622, 1623, 1624, 1625 which allow the panel to be torn off and therefore opened irreversibly.

[0072] When making the packaging, the panels are folded and in particular the panel 1601 is fixed to the panel 1604 via the adhesive strip 1605. The closing shutters 1610 And 1611 are folded down, which closes the packaging. When folding the flap 1610, the tabs 1614 And 1615 are inserted into the slots 1618 And 1619 respectively. Also, when folding the shutter 1611, the tabs 1616 And 1617 are inserted into the slots 1620 And 1621respectively. The tabs comprise respective fins which, once folded, can cooperate with the slots to block their extraction by elastic return as already explained with reference to the previous embodiments. Once the shutter is locked by blocking the fins in the slots, opening can be done by tearing off the tabs at the weaknesses 1622, 1623, 1624, 1625. Closing via the tabs 1614, 1615, 1616, 1617 is therefore done irreversibly because the tearing of this testifies to any subsequent opening without the possibility of returning to the previous state.

[0073] Always when making the packaging, when folding the flap 1610, the locking tab 1613 comes to cooperate with the opposite panel 1601 and the adjacent shutters 1606 And 1607 to close the packaging. Also, when folding the flap 1611, the locking tab 1612comes to cooperate with the opposite panel 1601 and the adjacent shutters 1608 And 1609 to close the package from the opposite side. The locking tabs 1613 And 1612 nevertheless allow a reversible closure to be achieved here.

[0074] Depending on the variant of the figure 16 , the tabs have only one fin. The tabs are inserted into the respective slots by rotating the flap that carries them around the fold line. Thus, for example, the tab 1615 fits into the slot 1619 when the panels 1602 And 1603 are folded approximately 90 degrees to each other along the fold line that separates them. The flap 1607 is also folded at approximately 90 degrees relative to the shutter 1602 according to the fold line which separates them and which contains the slot 1619.Then the tab is folded back to approximately 90 degrees relative to the flap 1610 which carries it. By folding movement of the latter in relation to the panel 1603 who wears it and according to the fold line which separates them, the tab 1615 comes to be inserted into the slot 1619. For the tab 1615, This folding movement constitutes a rotation around the fold line between the flap 1610 and the panel 1603. To facilitate this movement, the tab has a shape which allows it to remain, during the closing movement, once the fin is folded, substantially between two arcs of a circle connecting the slot and the fold line between the flap and the tab.

[0075] There figure 17 illustrates a detail of the tongue 1615. Two fictitious arcs of circles have been drawn. The tab's wing is shown folded. An arc 1701 part at the level of the extremity of weakness 1623of the fold line between the tab 1615 and the shutter 1610, on the side of the fold line between the flap 1610 And 1603. This arc 1701 arrives at the end of the slot 1619, on the shutter side 1610. The other arc 1702 part at the level of the extremity of weakness 1623 of the fold line between the tab 1615 and the shutter 1610, on the side opposite the fold line between the flap 1610 And 1603. This arc 1702 arrives at the end of the slot 1619, on the side opposite the shutter 1610. As has been described with reference to the figures 4 à 6 , the tab has a substantially trapezoidal base. Thus, the fold line is slightly shorter than the parallel line from which the fin begins. From the fold line, the tab extends outward (see lines e And f described with reference to figures 4 à 6 ). So, more precisely, the arcs 1701 And 1702, do not start strictly from the end of the fold line (distance e ) but pass through the most extreme point of the tongue at the base (distance f ). This makes it easier to insert the tab into the slot when forming the package.

[0076] There figure 18 is an illustration of a variant of the leaf of the figure 16 . The leaf 1800 has panels 1801, 1802, 1803, 1804 as well as a gluing strip 1805. These panels and the gluing strip 1805 are hinged together along fold lines. The sheet also has hinged flaps 1806, 1807, 1808, 1809, 1810, 1811. Each flap is hinged relative to a respective panel of the sheet. Some hinged flaps have locking tabs 1812, 1813allowing the corresponding flap to be locked in a closed position when the packaging is made from the sheet. Finally, according to provisions already described above and for the same functions, certain flaps have tabs 1814, 1815, 1816, 1817. For this purpose, the sheet has slits 1818, 1819, 1820, 1821 as already described. The tabs are connected to respective closing flaps by fold lines with weaknesses 1822, 1823, 1824, 1825 which allow the panel to be torn off and therefore opened irreversibly. In this variant, the panel 1801 carries a detachable card 1826. This map is for example a patient monitoring map. Finally, a weakness zone 1827 is performed on the panel 1801 which can be drilled to reach the locking tab 1813 when the package is resealed. The area of ​​weakness is located at the fold line between the panel 1801and the map 1826.

[0077] When making the packaging, the panels are folded and in particular the panel 1801 is fixed to the panel 1804 via the adhesive strip 1805. The closing shutters 1810 And 1811 are folded down, which closes the packaging. When folding the flap 1810, the tabs 1814 And 1815 are inserted into the slots 1818 And 1819 respectively. Also, when folding the shutter 1826, the tabs 1816 And 1817 are inserted into the slots 1820 And 1821respectively. The tabs have respective fins which, once folded, can cooperate with the slots to block their extraction by elastic return as already explained with reference to the previous embodiments. Once the shutter is locked by blocking the fins in the slots, opening can be done by tearing off the tabs at the weaknesses 1822, 1823, 1824, 1825. Closing via the tabs 1814, 1815, 1816, 1817 is therefore done irreversibly because the tearing of this testifies to any subsequent opening without the possibility of returning to the previous state.

[0078] Always when making the packaging, when folding the flap 1810, the locking tab 1813 comes to cooperate with the opposite panel 1801 and the adjacent shutters 1806 And 1807 to close the packaging. Also, when folding the flap 1811, the locking tab 1812comes to cooperate with the opposite panel 1803 and the adjacent shutters 1808 And 1809 to close the package from the opposite side. The locking tabs 1813 And 1812 nevertheless allow a reversible closure to be achieved here.

[0079] Depending on the variant of the figure 18 , the tabs have only one fin. The tabs are inserted into the respective slots by rotating the flap that carries them around the fold line. Thus, for example, the tab 1815 fits into the slot 1819 when the panels 1802 And 1803 are folded approximately 90 degrees to each other along the fold line that separates them. The flap 1807 is also folded at approximately 90 degrees relative to the shutter 1802 according to the fold line which separates them and which contains the slot 1819.Then the tab is folded back to approximately 90 degrees relative to the flap 1810 which carries it. By folding movement of the latter in relation to the panel 1803 who wears it and according to the fold line which separates them, the tab 1815 comes to be inserted into the slot 1819. For the tab 1815, This folding movement constitutes a rotation around the fold line between the flap 1810 and the panel 1803. To facilitate this movement, the tab has a shape that allows it to remain, during the closing movement, once the fin is folded, substantially between two arcs of a circle connecting the slot and the fold line between the flap and the tab. In this variant, the tabs have an eccentric position on the flap that carries them. For example, the tab 1815 extends from the shutter 1810 from one end of the shutter, on the closing tab side 1813.So the tab is not centered between the closing tab 1813 and the panel 1803. To allow the packaging to be properly locked, the slots 1819, 1819, 1820, 1821 do they also have a corresponding eccentric position. For example, the slot 1819 on the fold line between the flap 1807 and the panel 1802, is located at one end of the side of the panel 1801. This position corresponds to the eccentric position of the tab 1815.

[0080] There figure 19 illustrates a detail of the tongue 1815. The tab fin is shown in its folded position (the initial position of the fin is shown in dotted lines). Two fictitious circular arcs have been drawn. An arc 1901 part at the level of the extremity of weakness 1823 of the fold line between the tab 1815 and the shutter 1810, on the side of the fold line between the flap 1810 et 1803. This arc1901 arrives at the end of the slot 1819, on the shutter side 1810. The other arc 1902 part at the level of the extremity of weakness 1823 of the fold line between the tab 1815 and the shutter 1810, on the side opposite the fold line between the flap 1810 And 1803. This arc 1902 arrives at the end of the slot 1819, on the side opposite the shutter 1810. As has been described with reference to the figures 4 à 6 , the tab has a substantially trapezoidal base. Thus, the fold line is slightly shorter than the parallel line from which the fin begins. From the fold line, the tab extends outward (see lines e And f described with reference to figures 4 à 6 ). So, more precisely, the arcs 1701 et 1702, do not start strictly from the end of the fold line (distance e) but pass through the most extreme point of the tongue at the base (distance f ). This makes it easier to insert the tab into the slot when forming the package.

[0081] The present invention has been described and illustrated in this detailed description with reference to the attached figures. However, the present invention is not limited to the embodiments presented. Other variants, embodiments and combinations of features may be deduced and implemented by those skilled in the art upon reading this description and the attached figures.

[0082] To meet specific needs, a person skilled in the field of the invention may apply modifications or adaptations.

[0083] In the claims, the term " comporter" does not exclude other elements or other steps. The different characteristics presented and / or claimed can be advantageously combined. Their presence in the description or in different dependent claims does not in fact exclude the possibility of combining them. The reference signs cannot be understood as limiting the scope of the invention.

Claims

1. Pre-cut sheet (300) for producing a package with an anti-tamper device by folding comprising: - a set of hinged panels (301, 302, 303, 304) configured to form, after folding, faces of said package, - a set of closing flaps (306, 307, 308, 309, 310, 311) extending from said panels and configured to form, after folding, closures of said package, - at least one anti-tamper device (315, 319) configured to irreversibly seal a first closure of said package, said at least one anti-tamper device comprising at least one tab (314, 315) foldable along a first fold line (e), from which extends at least one fin (202, 203) foldable along a second fold line (ab), said tab being configured to be inserted, after folding said first and second folding lines, into a corresponding slot (318,319) for irreversibly sealing said first closure of said package by elastic return of said fin along said second fold line and blocking in said slot, - at least one reversible closing device (310, 313) with opening indicator (322) for reversibly sealing a second closure of said package, in which the tab body is intended to be inserted first and has a profiled shape facilitating the insertion of the at least one fin, or the at least one fin is intended to be inserted first and has a profiled shape facilitating the insertion of the tab body., 2. Sheet according to claim 1, wherein the at least one fin is provided to be inserted first, the at least one fin has a profiled shape facilitating the insertion of the tab body and the at least one fin extends in the direction of insertion of the tab, perpendicular to the first fold line, beyond the tab body.

3. A sheet according to claim 1, wherein the tab body is arranged to be inserted first, the tab body has a profiled shape facilitating insertion of the at least one fin and the tab body has a portion which extends beyond the at least one fin in the direction of insertion of the tab, perpendicular to the first fold line.

4. Sheet according to any one of the preceding claims, in which, said second fold line forms, from the first fold line, an angle of less than 90 degrees.

5. Sheet according to any one of the preceding claims, wherein said tab has an insertion width (f) less than or equal to a width of said slot when said at least one fin is folded along said second fold line.

6. Sheet according to any one of the preceding claims, in which said second fold line forms, from the first fold line, an angle greater than 20 degrees.

7. Sheet according to any one of the preceding claims, in which said first fold line comprises a zone of weakness causing said tab to be torn off beyond a force threshold applied to said zone.

8. Sheet according to any one of the preceding claims, in which at least one closing flap (306, 310) from which extends a locking flap (312, 313) allows reversible locking of said packaging after breaking of said anti-tampering device.

9. A sheet according to any preceding claim, wherein said slot (718, 719) is provided at a fold line between a hinged panel of said assembly and a closure flap extending from said panel.

10. Sheet according to claim 8, in which said slit (318, 319) is made at a fold line between said flap and said flap.

11. A sheet according to any preceding claim, wherein said fin (502, 503) extends beyond a tab body (501) in a direction of insertion into said slot and forms a profiled insertion edge of said tab into said slot.

12. Sheet according to any one of claims 1 to 10, wherein a tab body (601) extends beyond said fin (602, 603) in a direction of insertion into said slot and has a profiled insertion edge (605) of said tab into said slot.

13. Sheet according to one of the preceding claims, in which said fin is located at a distance (g) from said first line, in a direction of insertion of said tab into said slot, greater than a thickness of said sheet.

14. Sheet according to one of the preceding claims, in which said tab comprises a trapezoidal portion (504) with a first segment formed by said first fold line and a second parallel segment of length greater than said first side.

15. Sheet according to one of the preceding claims, in which at least one panel comprises a weak zone (721) configured to be irreversibly perforated to allow the opening of said packaging, once the anti-tampering device is inserted into said slot.

16. Sheet according to one of the preceding claims, wherein said tab (714, 715) extends from a closure flap (724, 725) of said set of closure flaps.

17. Sheet according to the preceding claim, in which said closing flap (903, 1003) from which said tab (901, 1001) extends comprises at least one weak zone (907, 1007) allowing it to be torn off at least in part.

18. Sheet according to one of the preceding claims, wherein said tab (314) extends from a hinged panel (303) of said set of hinged panels.

19. Sheet according to the preceding claim, in which said hinged panel from which said tab extends comprises a flexibility opening (321) allowing said tab to be moved away from said hinged panel for its insertion into said slot.

20. Packaging with an anti-tamper device obtained by folding a sheet according to one of the preceding claims.

21. A method of manufacturing a pre-cut sheet for producing a packaging with an anti-tamper device by folding, comprising the following steps: - cutting (1201) a template comprising a set of panels for forming faces of said packaging, a set of flaps for forming closures of said packaging, a tab and at least one fin for forming an anti-tamper device of said packaging for irreversibly sealing a first closure of said packaging, and at least one reversible closure device with an opening indicator, - producing (1202) fold lines between said panels to enable their articulation, - producing (1203) fold lines between said panels and said flaps to enable their closure, - producing (1204) a first fold line of said tab and a second fold line of said fin to enable the formation of said anti-tamper device,- production (1205) of an insertion slot configured to receive said anti-tampering device and to allow irreversibly sealing a closure of said packaging by elastic return of said fin along said second fold line and blocking in said slot, the tab body being designed to be inserted first and having a profiled shape facilitating the insertion of the at least one fin, or the at least one fin being designed to be inserted first and having a profiled shape facilitating the insertion of the tab body., 22. Method for manufacturing a packaging with an anti-tamper device by folding comprising the following steps: - obtaining (1301) a sheet according to one of claims 1 to 19, - folding (1302) said panels along fold lines between said panels, - folding (1303) said flaps along fold lines between said flaps and said panels, - folding (1304) said at least one fin along the second fold line, - folding (1305) said at least one tab along the first fold line, - inserting (1306) said tab into said slot.

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