FR3034760A1 - BAG WITH SECURE OPENING FOR CHILDREN - Google Patents

Abstract

The invention relates to a bag (1) comprising: - a first and a second wall (10, 20), - a closure device comprising support webs (12, 22) comprising complementary profiles (14, 24), - a additional wall (30), fixed on the first wall (10) and folded so that its free end extends towards the mouth (2) of the bag (1), the support webs (12, 22) being fixed on the second wall (20), and one of the support webs (12) is further secured to the additional wall (30), so that the spacing of the walls (10, 20) from the bag (1) when the complementary profiles (14, 24) are engaged causes rotation of the closure device around the second support web (22).

Description

FIELD OF THE INVENTION The present invention relates to the field of packaging bags. More specifically, the present invention relates to the field of packaging bags comprising opening / closing means, for example and not limited to the form of complementary profiles. BACKGROUND ART Numerous packaging bags and numerous closure devices for this purpose have already been proposed.

Most known closure devices for this purpose comprise two complementary profiles, for example of the male / female type or velvet type / hooks, or type of complementary hooks, carried by respective support webs.

FIG. 6 shows the mouth of a resealable bag known from document FR 2 628 067. FIG. 6 shows the two main walls 10, 20 of the bag at the mouth of this bag. this. Also shown in Figure 6 attached a closure device 100 comprising two complementary closure profiles 110, 120 carried by respective support webs 112, 122 respectively fixed on the walls 10 and 20. More specifically, the attachment areas of the carrier webs 112, 122 on the walls 10 and 20 are referenced 114 and 124. It will be noted in the examination of Figure 6 that the area 114 for fixing the support web 112 on the wall 10 is not superimposed on the male profile 110 but offset in relation to this one. It could be an alternative of an offset of the zone 124 for fixing the support web 122 on the wall 20 with respect to the female section 120. Thus, the web 112 forming a support for the male profile 110 is hinged to the wall 10 at the end. level of the attachment area 114.

As described in document FR 2 628 067, the above arrangement makes it possible to prevent the internal pressure of the bag from being applied to closure profiles 110, 120 and tends to separate them. In fact, thanks to the arrangement previously described and shown in FIG. 6, the separation of the walls 10, 20 of the bag (in order to open the latter) leads to a possible pivoting of the support web 110 at the hinge zone. formed by its fixing, without risk of separation of the closure profiles 110, 120. The bags corresponding to the arrangement shown in Figure 6 have already rendered great service and make the reopening of the bag difficult, so as to ensure its user that its contents can not come out easily.

It has also been proposed in document FR 2 963 927 that the two zones 114, 124 are located at a distance and on either side of the corresponding complementary profiles 110, 120 so that one of the hinged sails 112 is directed towards the inside the bag while the other hinged sail 122 is directed towards its mouth. These bags are even more resistant to internal and external stresses of the walls of the bag, so much so that it is now very difficult to open them without damaging the closure device 100 or the walls of the bag.

In some cases, it may be necessary to be able to open the bag without damaging it, in order to access its contents while being sure of being able to close it after opening. Such a sachet is found, for example, in the field of the packaging of harmful products, such as laundry tablets. Indeed, it is important to be able to guarantee users that the bag remains closed between two uses, in particular to prevent children from accessing its contents, while leaving the possibility for parents to open and close the bag. repeatedly without the risk of damaging it, and preferably without the successive openings and closings being too difficult.

SUMMARY OF THE INVENTION An object of the invention is therefore to provide a packaging bag, which is able to withstand the internal and external stresses of the walls of the bag, while allowing easy opening and closing of its bag. mouthpiece by a user other than a child, in particular to prevent access to the inside of the bag to children while guaranteeing the user the possibility of opening and closing the bag several times without risk of damage.

For this, the invention proposes a bag comprising: - a first and a second wall, each comprising a lower edge and an upper edge interconnected by lateral edges, - a closure device comprising a first and a second support sail each comprising at least one complementary profile, the first and the second support webs being fixed near the side edges of the second wall, and - an additional wall, comprising a first pan and a second pan, the first pan being fixed along of the upper edge of the first wall while the second pan is fixed on the second wall.

The additional wall is folded between the first pan and the second pan along a fold, so that the second pan extends towards the upper edge of the second wall. Furthermore, the first support veil and the second support veil are fixed on the second wall, the second support veil being further fixed on the second side of the additional wall 25 so that a biasing stress of the first and the second second wall of the bag when the complementary profiles are engaged causes a rotation of the closure device around the second support web. Some preferred but non-limiting characteristics of the bag 30 described above are the following, taken alone or in combination: the second panel of the additional wall is fixed near the lateral edges of the second wall, between the first support web and the fold - 3034760 4 - the second support sail comprises an upper fin carrying the at least one complementary profile and a lower fin extending in the extension of the upper fin, from the complementary profile, the upper fin being closer to the upper edge of the second wall that the lower fin and the second support veil being fixed on the second wall at the upper vane, the lower vane being at least partially free with respect to said second wall, - a passage between the upper fin and the second wall is formed to form an access zone to a region of the second paro. i which extends facing the at least one complementary section of the second support web, so that the upper fin is divided into three consecutive sections between the two lateral edges of the second wall, namely: a first section, extending between one of the lateral edges of the second wall and the access zone, a second section extending along the access zone, between the first section and the third section, and a third section, section, extending between the access zone and the other lateral edge of the second wall, the second support web is fixed along the first and third sections, but left free with respect to the second wall along the second wall; of the second section to form the passage, said passage passing between the upper fin and the second wall, - only a region of the second support veil which extends between the complementary profiles and the upper edge of the second wall is fixed 25 on the second wall, the region carrying the at least one complementary section being free relative to said second wall, the upper fin comprising a through slot along the second section, at the limit of the complementary profiles, - a region of the upper fin extending from the at least one complementary section along the second section is cut to form the passageway, said passageway passing between the upper fin and the second wall, the second section of the upper fin extends over a length of between 1.5 centimeters and three centimeters along the upper fin of the second support veil, the lower vane can be attached to the second wall along the second section and thus close the passage, - the first support veil comprises an upper vane carrying the at least one complementary section and a lower vane extending in the prolo nage of the upper fin, since the complementary profile, the upper fin being closer to the upper edge of the second wall 10 than the lower fin, and wherein a height of the upper fin of the first support veil is substantially equal at a height of the complementary profiles, so that the upper fin does not exceed complementary profiles, - the additional wall is formed integrally and in one piece with the first wall and extends in the extension of said first wall, or the additional wall is attached and fixed on the first wall, near its upper edge, so as to extend towards the lower edge of said first wall, or the additional wall is attached and fixed on the first wall, to distance of zo its upper edge, for example in a region adjacent to the fold, - the first support veil is formed integrally with the additional wall or is attached and fixed to the additional wall, - the first wall and the second wall are welded together along their lateral edges between the fold and their upper edge, 25 - the second support sail is fixed at a distance from the upper edge of the second wall, the fold extends at a distance of between 30 and 70 millimeters, typically of the order of forty millimeters, from the upper edge of the first wall, the first and the second support sail each comprise at least two complementary profiles, preferably at least three, for example between three and six, and / or 3034760 6 - all or part of the complementary profiles comprises sequential alterations perpendicular to the upper edge of the associated wall, typically sequential crashes .

BRIEF DESCRIPTION OF THE DRAWINGS Other features, objects and advantages of the present invention will become more apparent upon reading the following detailed description and with reference to the accompanying drawings given as non-limiting examples and in which: FIG. 1 is a perspective view of a first exemplary embodiment of a bag according to the invention, FIG. 2a is a sectional view along the axis AA of the first embodiment of FIG. 1, when the bag Figure 2b is a sectional view of the first embodiment of Figure 2a, when a person applies a tensile force on the walls to separate the complementary profiles of the closure device, Figure 3 is a sectional view of a second example of a bag according to the invention, when the bag is at rest, FIG. 4 is a detailed view of an embodiment of an access zone allowing easy opening of the bag. 'a FIG. 5a is a view from above of an exemplary embodiment of a pouch according to the invention, comprising the easy opening of FIG. 4; FIG. 5b is a perspective view of FIG. FIG. 5a, after opening with the aid of the easy opening, and FIG. 6 previously described schematically represents the mouth of a bag according to the state of the art. DETAILED DESCRIPTION OF AN EMBODIMENT A pouch 1 comprises, in a conventional manner per se, opposing first and second walls 10, 20 each comprising a lower edge 10a, 20a and an upper edge 10c, 20c interconnected by edges 3034760 7 lateral 10b, 20b. The lower edge 10a, 20a and the side edges 10b, 20b are connected so as to form a bottom 3, lateral sides 4 and a mouth 2 of the bag 1. The walls 10, 20 of the bag 1 can be subject to numerous 5 embodiments. It is preferably walls of thermoplastic materials. These walls 10, 20 may be mono- or multilayer, mono- or multi-material, transparent or opaque. If necessary, it may be a paper support coated with a layer of thermoplastic materials, or a metallized thermoplastic layer. The sachet 1 can be produced using a single sheet folded on itself and welded on two sides or of several sheets, for example two sheets welded together at their sides, preferably along ridges connecting the 10, 20 and forming the lateral sides 4 and the bottom 3 of the bag 1. The bag 1 further comprises: - a closure device, comprising a first and a second support veil 12, 22 each comprising at least one zo profile complementary 14, 24, and the first and the second support web 12, 22 being fixed near the side edges 20b of the second wall 20, and - an additional wall 30, comprising a first panel 32 and a second panel 34, the first pan 32 being fixed along the upper edge 10c of the first wall 10, close to said edge 10c, while the second panel 34 is fixed on the second wall 20. The additional wall 30 is folded between the first panel 32 and the second panel 34 along a fold 33, so that the second panel 34 extends towards the mouth 2 of the bag 1. The first support veil 12 and the second support veil 22 are fixed on the second wall 20, the second support web 22 being further fixed on the second panel 34 of the additional wall 30, so that a biasing stress of the first and second wall 20 of the bag 30 14 when the complementary sections 14 , 24 are engaged causes a rotation of the closure device around the second support web 22. This configuration drastically reduces the risks of opening the bag 1 by an infant and the risk of inadvertent opening of the bag 1 because of the internal stresses applied by the content of the bag on the closure device. Indeed, the spacing of the upper edges of the bag 1 or walls between the support webs and the bottom 3 of the bag 1 has the effect of pivoting the support webs 12, 22 of the closure device and to align them with the the axis of application of the forces on the walls (generally horizontally) thanks to the presence of the additional wall 30 which unfolds and the fixing of the first support veil 12 on the second wall 20. In this way, any additional effort on the sails supports 12, 22 is applied in the plane of the supporting webs 12, 22, and no longer perpendicular to them. The closure device The first and the second support web 12, 22 extend in a main direction parallel to the upper edge 20c of the second wall 20.

The support webs 12, 22 each comprise at least one complementary profile 14, 24, preferably several, extending along the upper edge 20c of the second wall. Preferably, the support webs 12, 22 comprise a plurality of complementary profiles 14. , 24, preferably between three and six complementary sections 14, 24, for example five. The presence of several complementary profiles 14, 24 makes it possible to facilitate the engagement of the closure device from the outer faces of the walls 10, 20 of the bag 1, reducing the precision necessary to ensure their closure. It also provides better resistance to the internal and external stresses of the walls 10, 20 of the bag 1.

The complementary profiles 14, 24 may be of the male / female, female / female type (arrow-shaped profiles, as illustrated in the figures) velvet / hooks, or alternatively of complementary hooks.

The additional wall 30 The first wall 32 of the additional wall 30 is fixed on the first wall 10 of the bag 1, close to the mouth 2, while the second wall 34 is movable with respect to this first wall 10. Preferably, the additional wall 30 extends generally inwardly of the bag 1, towards the bottom 3 thereof, so that its second pan 34 is set back from the mouth 2. In a first embodiment illustrated in FIGS. 2a, 2b and 3, the additional wall 30 may extend in the extension of the first wall 10 and be obtained by folding of said first wall 10 on itself. The additional wall 30 is thus formed integrally and in one piece with the first wall 10 and is simply fixed, at zo its first panel 32 on the first wall 10, its second panel 34 being fixed on the second wall 20 at the first support veil 12. Typically, the first wall 10 and the additional wall 30 may be formed in the same film which is folded on itself in a fold 35 extending along the upper edge 10c of the first wall 10, 25 so that the additional wall 30 extends in the extension of the first wall 10 and inwardly of the bag 1. The first panel 32 of the additional wall 30 then corresponds to the portion of the film which extends towards the inside of the bag 1 and which is adjacent to the fold 35, while the second pan 34 corresponds to the portion of the film which is adjacent to the end of said film inside the bag 1. In this embodiment, the EMBOU Chure 2 of the bag 1 is formed by a fold 35 at the level of the first wall 10.

The additional wall 30 is further folded in a second fold 33 between the first pan 32 and the second pan 34, so that the second pan 34 extends towards the mouth 2 of the bag 1. In this embodiment For example, the first support web 12 is thus fixed on the internal face of the additional wall 30, which corresponds to the face of the first wall 10 which extends towards the inside of the bag 1. According to a second embodiment illustrated in FIG. 3, the additional wall 30 is attached and fixed on the first wall 10 in an area adjacent to the upper edge 10c of the first wall 10 so as to extend towards the lower edge 10a of said first wall 10. Here again the additional wall 30 is folded in the second fold 33 in a manner similar to that described for the first embodiment, so as to form the first panel 32, which is fixed on the first wall 10, and the second pa 34, which is fixed on the second wall 20. In a variant, the additional wall 30 is attached and fixed at a distance from the upper edge 10c of the first wall 10. In this embodiment, the distance between the upper edge 10c and the fixing area 20 of the additional wall 30 of the first wall 10 is at least equal, and preferably greater than the distance between the upper edge 20c of the second wall and the first support web 12. The walls 32, 34 of the wall additional 30 may for example be fixed by welding or gluing on the wall 10, 20 associated.

In one embodiment, the second panel 34 of the additional wall 30 may further be welded to the second wall 20, between the first support web 12 and the fold 33. This embodiment thus makes it possible to place the closure device away from the fold 33, that the walls 10, 20 of the bag 1 are at rest or that they are solicited from the outside (by a person) or from the inside (by its contents).

Supporting webs 12, 22 Whatever the embodiment, the first and the second support webs 12, 22 are respectively fixed on the additional wall 30 and on the second wall 20 on the face (hereinafter rear face). which is opposed to the face carrying the complementary profiles 14, 24. In one embodiment, the first and the second support web 12, 22 are fixed on the lateral edges 20b of the second wall 20. For example, the support sails 12, 22 may be welded to the side edges of the second wall 20.

Preferably, the closure device extends inside the bag 1, away from the mouth 2, so as not to be directly accessible or visible from the mouth 2. For this purpose, the second support veil 22 is attached to the second wall 20 of the bag 1 at a distance from its upper edge 20c to reduce the risk of a child grasping the closure device. This is however not limiting, insofar as the closure device could also extend above the mouth 2.

Each support web 12, 22 comprises an upper fin 13, 23 carrying the complementary profiles 14, 24 and a lower fin 15, 25 extending in the extension of the upper fin 13, 23, from the complementary profiles 14, 24. The upper fin 13, 23 and / or the lower fin 15, 25 is fixed on the associated wall 10, 20 of the bag 1 so that the upper fin 13, 23 is closer to the mouth 2 than the lower vane 15, 25. The first support veil 12 can be formed integrally and in one piece with the additional wall 30. For example, the first support veil 12 can be extruded onto the additional wall 30. Alternatively, the first support web 12 may be attached and fixed to the additional wall 30, for example by welding or gluing. In this case, the first support veil 12 may in particular be fixed to the additional wall 30 via its lower vane 15 only, or alternatively over the entire surface of its rear face, that is to say by means of its lower fin 15 and its upper fin 13. The second support veil 22 can likewise be integrally formed in one piece with the second wall 20, or can be attached and fixed to the second wall 20.

This second support veil 22 can be fixed to the second wall 20 via its upper vane 23 and its lower fin 25. In this embodiment, the entire rear face of the second support veil 22 can therefore it is fixed on the second wall 20. As a variant, only the upper fin 23 of the second support veil 22 can be fixed to the second wall 20, in order to increase the hinge effect of the closure device. In this embodiment, the upper fin 23 may be fixed over its entire height on the second wall 20 (including in the area facing complementary profiles 24). Alternatively, only the portion of the upper fin 23 which extends from the complementary profiles 24 can be fixed on the second wall 20, as illustrated in particular in Figure 4, to maximize the hinge effect of the closure device. In one embodiment, a height h of the upper fin 13 of the first support veil 12 is substantially equal to a height h of the complementary profiles 14 which it carries so that the upper fin 13 does not protrude beyond 14 Since the first support veil 12 is fixed on the free end of the additional wall 30, such an embodiment thus makes it possible to reduce the possibilities of grasping the first support veil 12 or the wall 30 by a user seeking to open the closing device in order to access the contents of the bag 1. The user will only be able to grasp the additional wall 30 and the upper wing 23 of the second support sail 22. note that a height of the upper vane 23 of the second support veil 22 may also be substantially equal to a height of the complementary profiles 24 that it carries so the upper fin 23 does not protrude beyond the complementary profiles 24. In this embodiment, the second support web 22 can be fixed to the second wall 20 by means of its upper fin 23 and its 10 lower fin 25, or only at its upper fin 23, in which case it is the portion of the upper fin 23 which extends at the level of the complementary profiles 24 is fixed on the second wall 20 (the upper fin 23 does not extend beyond the complementary profiles 24).

DESCRIPTION OF THE EMBODIMENTS SHOWN IN THE FIGURES The embodiments illustrated in the figures will now be described more particularly. FIGS. 1, 2a and 2b illustrate a bag 1 in which the additional wall 30 is formed integrally and in one piece with the first wall 10 and the first support veil 12. The first wall 10 is therefore longer than the second wall 20 and is folded on itself along a first fold 35 so as to form the additional wall 30. The additional wall 30 is further folded along a second fold 33, so that the free end of the additional wall 30 extends towards the mouth 2 of the bag 1. In this configuration, the first panel 32 extends along the first wall 10, between the first and the second fold 33, while the second pan 34, which comprises the first support web 12, extends between the second fold 33 and the free end of the additional wall 30. The first panel 32 of the additional wall 30 extends towards the inside of the bag 1. Optionally, the first pan 32 of the Additional wall 30 can be welded to the side edges 10b of the first wall 10 along two weld lines 31a (see Figure 1). The second panel 34 of the additional wall 30 is fixed on the lateral edges 20b of the second wall 20, at the level of the support webs 12, 22. Here, the second panel 34 of the additional wall 30 is furthermore welded to the lateral edges 20b of the second wall 20, between the lower fin 15 of the first support veil 12 and the second ply 33 (see FIG. two weld lines 31b (see Figure 1). In this embodiment, the first support veil 12 thus extends away from the second bend 33 and is not fixed on the portion of the first wall 10 which extends opposite the first part 32 of the additional wall 30 It will be understood that this configuration has the advantage of allowing the portion of the first wall 10 to be aligned with the portion opposite the second wall 20, as illustrated in FIGS. 2b and 6a, when a user pulls on their upper edges 10c, 20c to access the interior of the bag 1. In this configuration, the forces are thus mainly applied to the ends of the support webs 12, 22 which are fixed on the side edges 20b of the second wall 20, a small portion of the forces being also applied to the lower fin 15 of the first support veil 12 and the upper fin 23 of the second support veil 22, in the plane of said sails 12, 22. Such efforts However, the complementary profiles 14, 24 of the closure device can not be separated. In this configuration, the first and second walls 10, 20 may be attached to one another along their lateral edges 10b, 20b, between their lower edge 10a, 20a and the fold 33, as illustrated in FIG. 1. Alternatively, the first wall 10 and the second wall 20 may be fixed together along their entire height along their lateral edges 10b, 20b, i.e. from their lower edge 10a, 20a to their upper edge 10c, 20c, by welding or gluing. In this variant 3034760 of use, the opening of the bag 1 by traction on the upper edges of the first and the second wall 10, 20 is even more difficult, the possible separation of the upper edges 10c, 20c of the walls 10 , 20 limiting the pivoting of the additional wall 30 and thus the force that can be applied to the complementary profiles 14, 24. It will be noted that, to allow such a fixing, a height of the additional wall 30 between the upper edge 10c of the first wall 10 and the first support veil 12 is preferably greater than a height between the upper edge 20c of the second wall 20 and the lower vane 15 of the first support veil 12.

In the example of FIGS. 1, 2a and 2b, the second support web 22 is fixed on the second wall 20 at its upper fin 23 only, the lower fin 25 remaining free with respect to the second wall 20.

This configuration makes it possible to increase the hinge effect of the closure device, by allowing the second support veil 22 to pivot when the walls 10, 20 of the bag 1 are moved apart. Moreover, the height h of the closure upper fin 13 of the first support veil 12 is substantially equal to the height h of the complementary profiles 14, so that the upper vane 13 does not protrude complementary profiles 14. FIG. 3 illustrates the second embodiment of a sachet 1.

This second embodiment differs from the example illustrated in FIGS. 2a and 2b only in that the additional wall 30 is attached and fixed to the first wall 10. The other characteristics described in connection with FIGS. 2a and 2b apply. therefore mutatis mutandis to this embodiment.

The first wall 10 may, however, be of similar length as the second wall 20, since it is not necessary to bend it to form the additional wall 30. The additional wall 30 is however folded along the second wall fold 33, between the first pan 32 and the second pan 34, so as to extend towards the mouth 2 of the bag 1. In this embodiment, the first pan 32 thus extends also along the first wall 10, between its upper edge 10c and the second fold 33, while the second panel 34 which comprises the first support web 12 extends between the second fold 33 and the free end of the additional wall 30.

It will be appreciated that, irrespective of the embodiment, the first support veil 12 could also be attached and fixed to the additional wall 30. Furthermore, as indicated above, the upper fin 23 of the second support veil 22 may not extend beyond the complementary profiles 24. In other words, the complementary profiles 24 can extend to the limit of the second support web 20. The bag 1 thus obtained is therefore able to withstand internal stresses. (due to the bulk of the contents of the bag 1) and 20 external (due to the action of a person - adult or child - on the mouth 2) walls 10, 20 of the bag 1, preventing any conventional opening of the bag 1 (by traction on the upper edges 10c, 20c of the walls 10, 20), even by an adult. Indeed, when the complementary profiles 14, 24 are engaged, the biasing of the walls 10, 20 of the bag 1 (ie perpendicular to the walls 10, 20 of the bag 1 according to the arrows F of FIGS. 2a and 2b) causes the tension of the second wall 20 and the additional wall 30 and the rotation of the closure device around the second support web 22 to globally align the support webs 12, 22, the second wall 20 and the additional wall 30 with the direction This alignment, visible in Figure 2b, prevents any opening of the bag 1, even by an adult.

To open the bag 1, it is for example possible to pinch the support webs 12, 22 in order to move the complementary profiles 14, 24 in opposite directions (shear). The free ends of the support webs 12, 22 being fixed to the side edges 20b of the second wall 20, this nipping has the effect of separating the complementary profiles 14, 24 near one of these edges 20b. The difficulty of opening by squeezing the support webs 12, 22 can be adjusted by welding the side edges 10b, 20b of the first and second walls 10, 20 over their full height. This difficulty can also be adjusted by changing the position of the closing device with respect to the fold 33 and / or the mouth 2 of the bag 1. In fact, the Applicant has found that the lower fin 15 of the first veil With the support 12 away from the fold 33, it was difficult to separate the complementary sections by pinching, the additional wall 30 tending to dissipate the forces applied to the bag 1. A distance between the limit of the complementary profiles 14 (at the lower fin 15) and the fold 33 may for example be of the order of 5 to 30 mm, typically 25 mm.

Furthermore, the closer the closure device is to the mouth 2, the more users (adults or children) tend to grip the device by the complementary profiles 14, 24 and not by their lower fins 25, 15, thus more difficult the relative displacement of the support webs 12, 22 and thus the separation of their profiles 14, 24.

It will be noted that this nipping of the supporting webs 12, 22 is not obvious for children, who naturally tend to catch the bag 1 by its walls 10, 20. However, the opening of the bag 1 by soliciting the upper edges 10c, 20c of the walls 10, 20 is not possible (without destroying the closure device of the bag 1) due to the rotation of the support webs 12, 22.

Furthermore, only a significant nipping of the support webs 12, 22 would be likely to open the bag 1. However, such an effort is too intense for a child, who can therefore access the contents of the bag 1.

In order to facilitate the opening of the bag 1 for adults, an "easy opening" for adults can be provided on the bag 1. In a first embodiment, the easy opening can for example be obtained by welding only a portion of the second support veil 22 on the second wall 20, to form an access zone for a finger 5 (preferably an inch) of an adult allowing it to solicit the carrier webs 12, 22 in spaced apart position (see by example 4 and 5a). More precisely, the upper fin 23 of the second support veil 22 can be divided into three consecutive segments 26-28 between the two lateral edges 20b of the second wall 20, namely: a first section 26 extending between one of the lateral edges 20b of the second wall 20 and the access zone; - a second section 27 extending along the access zone between the first section 26 and the third section 28, and - a third section 28, extending between the access zone and the other side edge 20b of the second wall 20. The access zone can be positioned anywhere along the second support web 20. Moreover, the access area may be off-center and be closer to one of the side edges 20b, to be more difficult to identify by a child.

The second support web 22 is then fixed, for example by welding or gluing, along the first 26 and the third section 28, but left free with respect to the second wall 20 along the second section 27 to form a passage 40 open on the mouth 2 and passing between the upper fin 23 of the second support veil 22 and the second wall 30 20.

Thus, an adult can introduce the thumb 5 of one of his hands into the passage 40 thus formed in order to grip the second wall 20 at the complementary profiles 14, 24 of the closure device and the thumb 5 with the other of his hands at the bottom 3 of the second fold 33 to capture the first wall 10 and the additional wall 30 (Figure 5a). Then, by spreading its thumbs 5 from each other, for example by rotating in opposite directions according to the solid arrows illustrated in FIG. 5a (towards the inside of the bag 1 for the thumb 5 in contact with the the second wall 20 and towards the outside of the bag 1 for the other thumb 5), the adult can prevent the rotation of the support webs 12, 22 which prohibit the opening of the closure device and can therefore easily separate the profiles Complementary 14, 24 (Figure 5b). Indeed, by passing his thumb 5 in the passage 40, the adult grasps the second wall 20 at the complementary profiles 14, 24 and can therefore apply a force perpendicular to the support webs 12, 22 on the complementary profiles 14, 24 , which is not possible by pulling only on the upper edges 10c, 20c. It should be noted that this opening is then easily achieved, without excessive effort for the adult. Alternatively, the adult can simply grasp the second wall 20 with his thumb 5, here are left thumb, draws the first wall 10 and the additional wall 30 with his other hand, here his right hand, and perform a movement. outward rotation with his right hand (following the dotted arrow in Figure 5a) without moving his left hand. The bag 1 then opens easily, without excessive effort for the adult.

If necessary, only the part of the second support web 22 which extends between the complementary sections 24 and the upper edge 20c of the second wall 20 may not be welded in the second section 27, the region of the upper fin 23 which extends opposite the complementary sections 24 being welded, in order to ensure a seal of the bag 1.

Alternatively, the upper fin 23 is left free along its entire height along the second section 27. In this case, optionally, the portion of the upper fin 23 which extends opposite the complementary profiles 24. can then be fixed, for example by welding, along the boundary between the first 26 and the second section 27, as well as along the boundary between the second 27 and the third section 28, as illustrated in FIG. 4. Optionally, the lower fin 25 may be fixed, by welding or bonding, to the second wall 20 along the second section 27 and thus close the passage 40. This embodiment makes it possible to further facilitate the opening of the bag. 1 by an adult, by increasing the rotational force applied by the second wall 20 on the complementary profiles 24, and make the bag 1 tight.

If necessary, the lower fin 25 may also be left free with respect to the second wall 20 along the first 26 and the third section 28, in order to ensure the hinge effect of the second support veil 22. In a second In one embodiment, the easy opening can be achieved by cutting and removing the portion of the upper fin 23 which extends from the complementary profiles 24 along the second section 27. The upper fin 23 is therefore discontinuous on along the second support web 22. The passage 40 is then formed by the cut portion of the upper fin 23 of the second support web 22. In a third embodiment, only the portion of the upper fin 23 of the second support veil 22 which extends between the complementary profiles 24 and the upper edge 20c of the second wall 20 is fixed, by welding or gluing, to the second wall 20, the complementary profiles 24 and The easy opening can then be obtained by making a slot in the upper fin 23 along the second section 27, between the end of the weld line and the profiles. 24. The passage 40 is then open on the mouth 2 and passes between the complementary sections 24 of the second support web 22 and the second wall 20.

A length (dimension along the second support web 22) of the second section 27 may be between 1.5 centimeters and three centimeters. Indeed, the longer the section 27 is, the easier it will be for the child to locate it on the bag 1.

Since the access zone is of short length, it is not very visible, in particular when the second support web 22 and the second wall 20 are of the same color or transparent. In order to simplify the opening of the bag 1 by an adult (only), this access zone may be discreetly signaled, forming a sensitive surface tactilely near the access zone. Thus, thickenings or holes may be formed on the surface, on the second wall 20 or on the upper fin 23 of the second support web 22, facing the opening of the access zone. For example, the upper fin 23 may comprise a series of perforations along the second section 27. Alternatively, a written indication or pattern may also be used to signal the easy opening on the second wall 20.

It will be noted that the presence of the additional wall 30 and the fastening of the closing device at a distance from the upper edge 10a, 20c of the walls 10, 20 make it possible to shift the closing device towards the interior of the bag 1 rather than at the of its mouth 2, which further reinforces the tendency of the children to grasp the walls 10, 20 of the bag 1 rather than to try to seize the support sails 12, 22, and reduces the risk that the child will see the device. closing when the bag 1 is placed on a support.

This tendency can be further enhanced by securing the closure so that the second ply 33 extends at a distance d of the order of one adult inch in length from the mouthpiece 2. (When the bag 1 is at rest), a distance d of between 30 and 70 5 millimeters, typically of the order of forty millimeters for a bag 1 with a width of about twenty centimeters. An adult will have no difficulty in opening the bag 1, placing his shoot at the bottom 3 of the second fold 33, while a toddler will have difficulty to introduce his thumbs 5 in the second fold 33 and in the passage 40, his 10 hands being too small. The child will therefore only be able to grip the upper edges 10c, 20c of the walls 10, 20, which does not open the bag 1. The walls 10, 20 of the bag 1 may also be made of an opaque material (not transparent), so as to reduce the possibility for children to see the closure device through the walls. Advantageously, the embodiment of the additional wall 30 allows it to act as a bellows, widening the mouth 2 of the bag 1 when it is closed. The bag 1 can therefore be placed upside down on a support, that is to say on its mouth 2, which not only makes it possible to obtain a bag 1 which can be placed stably on the support but Furthermore, it makes it possible to hide the opening of the bag 1 to children, who see neither the mouth 2 nor the closing device.

The complementary profiles 14, 24 may be sequentially altered in accordance with an alteration in a direction transverse to the support webs 12, 22. The sequential alterations are sequential local modifications of the complementary profiles 14, 24, which may include sequential crashes and / or or sequential incisions without material removal (i.e., either only sequential crashes, or only sequential incisions, or both sequential crashes and sequential incisions). We can refer in particular to the international application No. EP2012 / 073186 in the name of the Applicant, which describes examples of realization of sequential alterations.

In this embodiment, all or part of the complementary profiles 14, 24 may comprise the sequential alterations. Thus, several complementary profiles 14, 24 may comprise sequential alterations while at least one complementary profile 14, 24 may remain intact, or vice versa.

The sachet 1 may further comprise an opening indicator, enabling a person to verify that a third party has not previously opened the sachet 1. Such an opening witness may in particular be formed by extending the walls 10, 20 of the bag 1 or the supporting webs so as to connect them one to the other. The opening indicator may be external and extend above the complementary profiles 14, 24, or inside and extend in the bag 1, between the complementary profiles 14, 24 and the bottom 3 of the bag 1. For example and in a manner known per se, the two walls 10, 20 can be connected using a peelable multilayer. The walls 10, 20, the additional wall 30, the supporting webs 12, 22 and the complementary profiles 14, 24 may be made of a single material, in particular one of the following materials: polypropylene PP, poly ( ethylene terephthalate) PET, polyethylene PE, high density polyethylene HDPE, low density polyethylene LDPE and their associated copolymers, ethylene copolymers and / or propylene copolymers. Alternatively, these different elements of the bag 1 may be made of different materials. In particular, a bag 1 comprising a first wall 10, a second wall 20 and an additional wall 30 made of poly (ethylene terephthalate) and / or of polyethylene and a closure device may be mentioned in a non-limiting manner. (Support webs 10, 20 and complementary profiles 14, 24) of polypropylene.

Moreover, the first wall 10, the second wall 20 and the additional wall 30 may have a thickness of between 30 micrometers and 200 micrometers, typically of the order of 60 micrometers to 150 micrometers, especially when said walls 10, 20, Are formed in one of the materials described above. It should of course be understood that these walls can be made of complex materials comprising several layers of different materials. Finally, by welding there will be understood here a thermal welding, an ultrasonic weld, for example by points, or both (carried out successively).

Claims (17)

REVENDICATIONS1. Bag (1) comprising: - a first and a second wall (10, 20), each comprising a lower edge (10a, 20a) and an upper edge (10c, 20c) interconnected by lateral edges (10b, 20b) - a closure device comprising a first and a second support web (12, 22) each comprising at least one complementary profile (14, 24), the first and second support webs (12, 22) being fixed near the edges sides (20b) of the second wall (20), and - an additional wall (30), comprising a first panel (32) and a second panel (34), the first panel (32) being fixed along the upper edge (15). (10c, 20c) of the first wall (10) while the second panel (34) is fixed on the second wall (20), the bag (1) being characterized in that: - the additional wall (30) is folded between the first pan (32) and the second pan (34) along a fold (33), so that the second pan (34) extends towards the upper edge 10c, 20c) of the second wall (20), the first support veil (12) and the second support veil (22) are fixed on the second wall (20), and the second support veil (22) is further secured to the second panel (34) of the additional wall (30), so that a biasing of the first and second wall (10, 20) of the bag (1) when the complementary profiles ( 14, 24) are engaged causes rotation of the closure device around the second support web (22). 30 2. Bag (1) according to claim 1, wherein the second panel (34) of the additional wall (30) is fixed near the side edges 3034760 26 (10b, 20b) of the second wall (20), between the first support sail (12) and the fold (33). 3. Bag (1) according to claim 2, wherein the second support web (22) comprises an upper fin (23) carrying the at least one complementary profile (24) and a lower fin (25) extending in the extension of the upper fin (23) from the complementary profile (24), the upper fin (23) being closer to the upper edge (20c) of the second wall (20) than the lower fin (25) and the second support web (22) being fixed on the second wall (20) at the upper fin (23), the lower fin (25) being at least partially free with respect to said second wall (20). 4. Bag (1) according to claim 3, wherein a passage (40) 15 between the upper fin (23) and the second wall (20) is formed to form an access zone to a region of the second wall (20) extending opposite the at least one complementary profile (24) of the second support web (22), so that the upper fin (23) is divided into three consecutive sections (26-28) between the two lateral edges (10b, 20b) of the second wall (20), namely: - a first section (26) extending between one of the lateral edges (20b) of the second wall (20) and the access area, - a second section (27), extending along the access zone, between the first section (26) and the third segment (28), and 25 - a third segment (28). ), extending between the access area and the other side edge (20b) of the second wall (20). 5. Bag (1) according to claim 4, wherein the second support web (22) is fixed along the first (26) and the third section (28), but left free with respect to the second wall (20) along the second section (27) to form the passage (40), said passage (40) passing between the upper fin (23) and the second wall (20). 3034760 27 6. Bag (1) according to claim 4, wherein only a region of the second support web (22) which extends between the complementary sections (24) and the upper edge (10c, 20c) of the second wall 5 (20). ) is fixed on the second wall (20), the region carrying the at least one complementary profile (24) being free with respect to said second wall (20), the upper fin (23) comprising a through slot along the second section (27), at the limit of the complementary profiles (24). The bag (1) according to claim 4, wherein a region of the upper fin (23) extending from the at least one complementary section (24) along the second section (27) is cut in order to forming the passage (40), said passage (40) passing between the upper fin (23) and the second wall (20). 8. Sachet (1) according to one of claims 4 to 7, wherein the second section (27) of the upper fin (23) extends over a length of between 1.5 centimeters and three centimeters along the length upper fin (23) of the second support veil (22). 9. Bag (1) according to one of claims 4 to 8, wherein the lower fin (25) can be attached to the second wall (20) along the second section (27) and thus close the passage (40). ). 10. Sachet (1) according to one of claims 1 to 9, wherein the first support web (12) comprises an upper fin (13) carrying the at least one complementary profile (14) and a lower fin (15) extending in the extension of the upper fin (13) from the complementary profile (4), the upper fin (13) being closer to the upper edge (20c) of the second wall (20) than the fin lower part (15), and wherein a height (h) of the upper vane (13) of the first support veil (12) is substantially equal to a height (h) of the complementary sections (14), so that upper fin (13) does not protrude complementary profiles (14). 11. Bag (1) according to one of claims 1 to 10, wherein: - the additional wall (30) is formed integrally and in one piece with the first wall (10) and extends in the extension of said first wall (10), or - the additional wall (30) is attached and fixed on the first wall (10), near its upper edge (10c), so as to extend towards the lower edge (10a). ) of said first wall (10), or - the additional wall (30) is attached and fixed on the first wall (10), away from its upper edge (10c), for example in a region adjacent to the fold (33) . 15 12. Bag (1) according to one of claims 1 to 11, wherein the first support web (12) is integrally formed with the additional wall (30) or is attached and fixed on the additional wall (30). 13. Bag (1) according to one of claims 1 to 12, wherein the first wall (10) and the second wall (20) are welded together along their side edges (10b, 20b) between the fold ( 33) and their upper edge (10c, 20c). 14. Bag (1) according to one of claims 1 to 13, wherein the second support web (22) is fixed at a distance from the upper edge (20c) of the second wall (20). 15. Bag (1) according to one of claims 1 to 14, wherein the fold (33) extends at a distance (d) between 30 and 70 millimeters, typically of the order of forty or so. millimeters, of the upper edge (10c) of the first wall (10). 3034760 29 16. Bag (1) according to one of claims 1 to 15, wherein the first and the second support web (12, 22) each comprise at least two complementary profiles (14, 24), preferably at least three, by example between three and six. 17. Bag (1) according to one of claims 1 to 16, wherein all or part of the complementary profiles (14, 24) comprises sequential alterations perpendicular to the upper edge (10c, 20c) of the wall (10, 20). associated, typically sequential crashes 5 10