FR3029506A1 - EASILY OPENING DEVICE FOR A METAL CONTAINER - Google Patents

Abstract

The present invention relates to an easy-opening device (1) for a metal container, which device (1) comprises (a) a bottom member (2), in which at least one through hole (3) is provided, and (b) ) closure means (4) adapted to close said at least one orifice (3) of said bottom member (2). The closure means (4) are secured to said bottom element (2) via: - degradable assembly means (5) which are intended to be degraded by a first operation of said closure means (4) from a closed position to an open position, and - repositionable assembly means (6) which are adapted to allow a maneuver of said closing means (4) between said open and closed positions after said degradation of said means for degradable assembly (5).

Description

TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention relates to the general field of packaging, and in particular that of easy-opening devices for containers of the kind cans.

BACKGROUND ART Certain metal containers, in particular cans for the packaging of foodstuffs (for example liquids), are conventionally equipped with an "easy" opening device which avoids the use of open type tools. can opener. A solution currently used consists of a one-piece metal cover comprising a central shutter panel comprising a removable portion which is delimited by a breaking initiation line.

For the separation of this removable part, the breaking initiation line is torn by manipulation of an opening member commonly known as the opening ring. According to another known solution, generally for non-liquid foodstuffs, the metal lid comprises a bottom element on which is secured a peelable sealing membrane, by means of a bead (or band) sealing. Such sealing means are described, for example, in documents EP-1 878 666. The closure diaphragm is provided with a pull tab which allows the transmission of the force applied by the user, for the degradation of the bead. during the first opening. In general, once maneuvered in the open position, these current closure means are degraded and are no longer repositionable in a closed position.

Therefore, these lids of the state of the art are interesting mainly to equip metal containers whose content is intended to be delivered / consumed at one time. For various reasons, it is possible for the packaged product to be delivered / consumed in several times, spaced apart over time.

In this case, the consumer is then often led to use stratagems to improve the preservation of the product in its container, for example by closing at best its access port to the product with a reported object.

However, this approach does not allow a simple and effective closure of the access port, with the conservation problems that arise for the packaged product. In this context, there is a need for means to close such an easy opening device after its first opening, in an ergonomic and efficient manner. OBJECT OF THE INVENTION To overcome these drawbacks, the Applicant has developed a new easy opening device structure, which additionally offers the original functionality of being able to be closed quickly and easily. The easy-open device according to the invention, for a metal container, comprises: a) a base member, in which at least one through hole is provided, and b) closure means adapted to close said at least one orifice of said bottom member, which closure means are secured to said bottom member through degradable assembly means which extend around said at least one orifice and which are intended to be degraded by a first maneuver of said closure means from a closed position, wherein said closure means are adapted to close said at least one orifice, to an open position, wherein said closure means are at least partially separated from said at least one an orifice.

And according to the invention, said closure means are further secured to said bottom member by means of repositionable assembly means which are adapted to allow a maneuver of said closure means between said open and closed positions after said degradation of said degradable assembly means.

Such closure means thus make it possible to reconcile simple and rapid opening and closing. Such an easy-open device thus makes it possible to keep the packaged product in the associated container, to deliver it in several times spaced apart over time, while allowing a new closure of this container for optimum preservation of the product. The repositionable assembly means advantageously comprise interlocking means, preferably by elastic deformation.

In this case, the sealing means advantageously comprise at least one plug element which is intended to be introduced through said at least one orifice; and said plug member and said orifice cooperate through the interlocking means. More preferably, said at least one orifice is delimited by a border, and said plug member is made of at least one material capable of undergoing elastic deformation to cooperate by said edge. The plug member advantageously comprises a groove complementary to said edge to form together the interlocking means by elastic deformation.

According to a particular embodiment, the sealing means are constituted by said plug member which is secured to the metal base element by means of the degradable assembly means and by means of the interlocking means. In this case, the cap member advantageously comprises: an inner part forming the interlocking means; an outer part provided with (i) a peripheral collar arranged facing a peripheral band extending over the around said at least one orifice and secured to said peripheral strip via the degradable assembly means intended to be degraded partially or totally, and (ii) a gripping tab, for the operation of said plug member since its closed position to its open position. The metal base element may also include a concave portion which is arranged opposite the gripping tab, to facilitate its pinching.

According to another particular embodiment, the closure means comprise: the plug element and a peelable membrane comprising, on the one hand, a closure part covering an outer face of said plug element and is secured to the bottom element by the degradable assembly means and, on the other hand, a gripping portion for operating said peelable membrane. In this case, the plug element is advantageously: independent of the peelable membrane, or secured, in one-piece or attached manner, with the inner face of said peelable membrane, consisting for example of an extra thickness of said inner face. Again in this case, the metal bottom element advantageously comprises a panel defining a general plane provided with a concave portion, offset on the side of an inner face of said metal bottom member and in which is formed said at least one orifice ; the plug member has an upper face extending between said general plane and said concave portion.

Still in this case, the sealing means advantageously comprise a holding portion which is fixedly secured to the bottom element. According to other advantageous features of the invention: the edge of the orifice comprises a fold oriented towards an outer face of the bottom element; the bottom element consists of a bottom element intended to be fixed on an upper edge of a wall belt, or a bottom element which is in one piece of a container body. The present invention further relates to a container, in particular of the type metal tin, comprising an easy-opening device according to any one of the preceding claims. The present invention also relates to a peelable membrane for a metal container, comprising an inner face intended to be secured by degradable assembly means with an outer face of a bottom member having at least one orifice. And the inner face of said membrane has a plug member, integral or attached, for insertion through at least one orifice in said metal bottom member. The present invention also relates to a method for the manufacture of an easy-opening device according to the invention, comprising the following successive operations: the supply of the bottom element provided with said at least one orifice, the setting up closure means on said metal bottom element, by the implementation of degradable assembly means and repositionable assembly means. In the case of closure means comprising a plug member associated with a peelable membrane, the establishment of the closure means advantageously comprises: either - placement of said plug member through the orifice, then - A setting of said peelable membrane; or - placing said peelable membrane, and then - placing said plug member by introducing through an inner side of said orifice, opposite said peelable membrane. DETAILED DESCRIPTION OF THE INVENTION The present invention will be further illustrated, without being in any way limited, by the following description of various particular embodiments in relation to the appended figures in which: FIG. 1 represents, schematically and in perspective, a easy opening device according to the invention, the bottom element forms a metal lid and whose closure means (peelable membrane associated with a non-visible cap element) are in the closed position; - Figure 2 shows schematically and in perspective, the easy-opening device according to the invention of Figure 1, the closure means were operated in the open position (with the cap member visible); 3 schematically and in section, a device with easy opening according to the invention, the bottom element forms a metal cover in which the closure means, in the closed position, comprise a fastened plug element with a peelable membrane; - Figure 4 is a partial and enlarged view of the device according to Figure 3, showing in detail said closure means, the cap member comprises an inner portion in the form of a lip to form the interlocking means; FIG. 5 represents, schematically and in section, an alternative embodiment of the device with easy opening according to FIG. 4, whose plug element comprises a solid inner part; FIG. 6 schematically and in section shows an easy-opening device according to the invention, the bottom element of which still forms a metal cover, in which the closure means, in the closed position, are constituted by a plug member having an inner portion provided with interlocking means formed by a peripheral groove; - Figure 7 shows schematically and in section, a variant 20 of the easy-opening device according to Figure 6, wherein the cap member comprises an inner portion provided with interlocking means formed by an annular bead; - Figure 8 shows schematically and in section, another variant of the easy-opening device according to Figure 6, wherein the plug member comprises an inner portion provided with means of interlocking force; - Figure 9 shows, schematically and in section, an easy opening device according to the invention, the bottom element of a box body in which the closure means are in the closed position; FIG. 10 is a partial and enlarged view of the easy-opening device according to FIG. 9, showing in detail said closure means comprising a peelable membrane associated with a plug element (identical to FIG. 5); 11 is a diagrammatic sectional view of a variant embodiment of the easy-opening device according to FIG. 10, the cap element of which comprises an inner part in the form of a lip (identical to FIG. 4); FIG. 12 is a diagrammatic sectional view of an alternative embodiment of the easy-opening device according to FIG. 10, in which the closure means, in the closed position, consist of a plug element comprising an inner portion provided with nesting means in the form of a peripheral groove (identical to FIG. 6); FIG. 13 is a diagrammatic sectional view of a variant of the easy-opening device according to FIG. 12, in which the plug element has another embodiment (identical to FIG. 7); FIG. 14 represents, schematically and in section, another variant of the device with easy opening according to FIG. 12, in which the plug element comprises an inner part provided with force-fitting means (identical to FIG. 8). .

Easy Opening Device The easy opening device 1, shown in FIGS. 1 to 14, is intended to equip a metal container. By "easy-open device" is meant a device fitted to the metal container and which avoids the use of box-type tools for access to its contents. By "metal container" is meant in particular a container-type container for containing a foodstuff or any other product.

This container conventionally comprises two bottom elements which are connected by a side wall belt (circular, square, rectangular, etc.). Such a container is advantageously made in several parts: either "two parts": a bottom element attached to a metal container body comprising a side wall belt and a bottom element, or - or "three parts": two bottom elements attached to a side wall belt. In the present case, the easy-opening device 1 according to the invention comprises: a base element 2, advantageously made of metal, in which at least one through orifice 3 is provided (in this case a through orifice); single), and - shutter means 4 adapted to close said at least one orifice 5 3 of said bottom member 2. The bottom element 2 of the easy-opening device 1 according to the invention advantageously consists of: - an element bottom 2 only (Figure 1 to 8), also called "lid", intended to be fixed on a border of a single wall belt (box three 10 pieces) or on a border of a belt of walls associated with a monoblock bottom element (two-piece box), or - a bottom element 2 which is in one piece of a container body (two-piece box - FIGS. 9 to 14). In general, the bottom element 2 is advantageously made in one piece by a stamping technique, that from a sheet metal material (preferably aluminum, steel, etc.). This base element 2 is conventionally composed of two parts: a central part forming a central shutter panel defining a general plane P of the bottom element 2 (FIG. a through hole 3, and - a peripheral portion 22, which is adapted to be secured to the edge of the side wall belt (Figures 1 to 8) or which is connected with a side wall belt 23 (Figures 9 to 14) .

The peripheral portion 22 is here ring-shaped or ring-shaped. In the case of a "lid" (FIGS. 1 to 8), this peripheral portion 22 is adapted for fastening the bottom element 2, advantageously by crimping, to the edge of the lateral wall belt 30 comprising here a cylindrical shape. Alternatively, the peripheral portion 22 may have any other shape (for example square, rectangular) that would be adapted to the section of the lateral wall belt (if necessary parallelepiped). For its part, the central portion 21 has two opposite faces: an outer face 211, corresponding to the upper face of the bottom element 2 and intended to be oriented towards the outside of the container obtained, and a face 212, corresponding to the underside of the bottom member 2 and intended to be oriented towards the inside of the container (opposite the other bottom element of this container). This central portion 21 here comprises a single through-orifice 3 which is formed near the peripheral portion 22. The orifice 3 can have any desired shape, in this case an elongate (oval or oblong) shape with its longitudinal axis. extending radially relative to the central portion 21. This orifice 3 is in particular delimited by a border 31 which is advantageously formed by a fold (for example a hem) oriented on the side of the outer face 21 of the bottom member 2 .

This feature aims to protect the edge obtained by cutting the central portion 21 to form the through hole 3, and thus avoid contact between the product and the unprotected edge of the bottom member 2 including the risk of corrosion and contamination that would result.

Alternatively, not shown, the bottom member 2 may comprise any other arrangement or orientation of said at least one orifice 3 and / or any other number of orifices 3 (two or more). The shutter means 4 fitted to the bottom element 2 can be operated between two positions: a closed position (FIG. 1 in particular), in which said shut-off means 4 are able to close the orifice 3, and - a open position (Figure 2), wherein said closure means 4 are at least partially separated from the orifice 3. In the closed position, the sealing means 4 provide a seal (at least to the liquids and the air) through the orifice 3. In the open position, the closure means 4 are in a configuration allowing the passage of the content through the orifice 3 released. The sealing means 4 are further adapted for simple and effective re-closing of the through-orifice 3, after a first opening.

For this, according to the invention, the closure means 4 are secured to said bottom element 2 by means of a pair of assembly means: - first assembly means 5, called "degradable" and 5 - second assembly means 6, called "repositionable". The degradable assembly means 5 extend around said at least one orifice 3. These degradable assembly means 5 are intended to be degraded by a first operation of said closure means 4 from a closed position, in which said means 4 are capable of closing said at least one orifice 3, to an open position, in which said closure means 4 are at least partially separated from said at least one orifice 3. By "at least partially" is meant a partial or total separation of the closure means 4 with respect to the orifice 3. Such degradable assembly means 5 advantageously consist of sealing means (barrier) which are able to prevent the passage of The degradable assembly means 5 preferably consist of sealing means, more preferably heat-sealing means or 3. These sealing means 5 are advantageously obtained by assembling compatible materials which are carried by the surfaces to be assembled together. sealing means 4 and the bottom element 2. This sealing material is for example chosen from polypropylene and / or polyethylene. These sealing means 5 thus form a sealing bead 51 extending around the opening or openings 3 to be closed (shown schematically in FIG. 2), in order to ensure optimum sealing of the latter. On their side, the repositionable assembly means 6 are adapted to allow a maneuvering of said closure means 4 between said open and closed positions after the degradation of the degradable assembly means 5.

For this, these repositionable assembly means 6 advantageously comprise interlocking means, preferably of the interlocking type by elastic deformation or the type of interlocking force. By "interlocking elastic deformation" or "elastic casing 5" means an assembly mode in which the elements to be assembled are deformed during their cooperation. Such interlocking elastic deformation is still known as snap fit or snap fit. Following a first opening, the assembly means 10 repositionable 6 will thus allow to bring and maintain the closure means 4 in the closed position at the orifice 3 (Figure 1 in particular). The product remaining in the container can thus be optimally stored between two openings for later consumption. The sealing means 4 according to the invention, in particular their repositionable assembly means 6, can take different forms. These closure means 4 comprise for this at least one plug member 7 which is intended to be introduced through the orifice 3, to cooperate together through the aforementioned interlocking means 6. The plug member 7 is made of at least one material capable of undergoing elastic deformation, so as to undergo an elastic deformation during its introduction and its extraction relative to the orifice 3 and so as to cooperate (in expansion ) with the border 31 of the orifice 3 by an elastic fitting phenomenon. By "material capable of undergoing elastic deformation" is meant in particular an elastomeric material or an elastomeric plastic material. This plug element 7 is thus projecting on either side of the associated orifice 3, and it matches its edge 31 (in particular to seal this orifice 3). This plug element 7 advantageously comprises two parts: an outer part 71, extending on the side of the outer face 211 of the central part 21 of the bottom element 2 and terminated by an upper face 711, and 3029506 12 - an inner portion 72, forming the means 6 for interlocking through the complementary orifice 3. This inner portion 72 can also be secured to the contour of the orifice 3 through degradable assembly means 5.

According to a particular embodiment, the inner portion 72 comprises a peripheral groove 721 which is complementary to the edge 31 of the orifice 3, to form together the engagement means 6 by elastic deformation. In FIGS. 4 and 11, the inner portion 72 comprises a peripheral lip 722, extending the upper portion 71 inwardly to form the peripheral groove 721. This peripheral lip 722 is advantageously divergent so as to obtain optimum support. against the border 31 of the orifice 3 under the effect of the internal pressure.

In FIGS. 5, 6, 10 and 12, the inner portion 72 consists of a solid portion provided at its periphery with the circumferential groove 721. Alternatively, according to other particular embodiments: as shown in FIGS. 7 and 13, the lower part 72 consists of a bead or o-ring, intended to be positioned on the inside of the orifice 3 by elastic deformation, or - as shown in FIGS. 8 and 14, the lower part 72 has a decreasing sectional shape (devoid of peripheral groove) to form means 6 for the interlocking force with the edge 31 of the orifice 3.

Such plug members 7 may be associated with a peelable membrane or may consist of a one-piece piece. For example, in the embodiment according to Figures 1 to 5, the cap member 7 of the closure means 4 is associated with a peelable membrane 8 (also called "operculum").

By "peelable membrane" is meant, for example, a structure as described in document EP-1 878 666. This peelable membrane 8 advantageously consists of several superimposed layers, namely mainly: a base layer, produced in a flexible and resistant barrier material, eg aluminum, and a sealing layer, for example a blend of polypropylene and polyethylene. This peelable membrane 8 has two faces: - an outer face 81, intended to be oriented opposite the bottom element 2, and - an inner face 82, intended to be oriented opposite the bottom element 2 and to be sealed with its outer face 211 through degradable assembly means 5. In this case, this peelable membrane 8 here consists of an elongate tongue-shaped piece which has three parts successively distributed over its length. a gripping portion 85 for operating said peelable membrane 8, a closing portion 86 covering the upper face 711 of the plug member 7 and secured to the bottom member 2 by the means of degradable assembly 5, and - a holding portion 87, which is fixedly secured to the bottom member 2. The gripping portion 85 consists of a pull tab which is free with respect to the bottom member 2, p to ensure its manual peeling. This gripping portion 85 advantageously extends close to the peripheral portion 22 of the bottom element 2. Before peeling and in a conventional manner, the pull tab 85 is advantageously folded opposite and against the outer face 81 of the shutter diaphragm 8. Alternatively, this gripping portion 85 may extend facing a concave portion 215 as described below. The closure portion 86 comprises two portions: - a first portion 861, central, covering the upper face 711 of the cap member 7 reported in its orifice 3, and - a second portion 862, peripheral, secured to a band 218 of the outer face 211 of the bottom element 2 extending around the orifice 3, through the degradable assembly means 5 forming the sealing bead 51.

The plug member 7 can be integrally connected, in one-piece or on a report, with the inner face 82 of said peelable membrane 8. In the "attached" case, the plug member 7 is manufactured independently of the peelable membrane 8 for example by molding.

Then, the inner face 82 of the peelable membrane 8 and the upper face 711 of the plug member 7 are advantageously secured by sealing. In the "monoblock" case, this plug element 7 consists, for example, in an extra thickness of said inner face 82 of the peelable membrane 8, advantageously obtained by printing on this inner face 82 of the peelable membrane 8. Alternatively, the plug member 7 may be independent of the peelable membrane 8. In this case, the peelable membrane 8 is separated from the bottom member 15 during the first opening, by degradation of the degradable assembly means 5; then the plug member 7 is separated from the orifice 3 by decoupling the engagement means 6. The holding portion 87, fixed and irremovable, is obtained by an increased surface area and / or by suitable sealing materials.

By "immovable" is meant a pull-out resistance in the case of normal traction by a user, for example at least 30 N, preferably between 40 and 50 N. In general, to prevent the the plug member 7 protrudes at the outer face 211 of the bottom member 2, the orifice 3 is formed in a concave portion 214 of the central portion 21 of the bottom member 2. This concave portion 214 thus forms a reservation integrating at least a portion of the outer portion 71 of the plug member 2. This concave portion 214 is offset on the inner face side 212 of the bottom member 2. The upper face 711 of the plug element 7 then extends between the general plane P and the concave portion 214, advantageously coplanar with said general plane P.

In addition, the sealing bead 51 of the degradable assembly means 5 then extends around this concave portion 214 (FIG. 1), or in addition between the cap member 7 and this concave portion 214. In a manner similar to that described in FIG. Alternatively, in the embodiment according to FIGS. 6 to 8 and 12 to 14, the sealing means 4 are constituted by the plug member 7 alone, without the peelable membrane. In this case, the plug element 7 is secured to the bottom element 2 via the degradable assembly means 5 and through the repositionable assembly means 6.

Again, this plug element 7 advantageously extends, at least partially, within the concave portion 214. This plug element 7, monobloc, is made of one or more materials capable of undergoing elastic deformation (for example elastomeric materials).

Again, the plug member 7 comprises: an outer portion 71, extending on the side of the outer face 211 of the central portion 21 and having an upper face 711 free, an inner portion 72 forming the means of interlocking 6 through the complementary orifice 3.

In this case, the outer portion 71 advantageously comprises two parts: a peripheral flange 715 arranged facing a peripheral band 218 extending around the periphery of said at least one orifice 3 (or even the concave portion 214) and joined together with said peripheral strip 218 through the degradable assembly means 5 (in this case the sealing bead 51), and - a gripping tab 716, for the operation of said cap member 7 from its closed position to in its open position. The bottom element 2 then advantageously comprises a concave portion 215 which is arranged facing the gripping tab 716, to facilitate the passage of finger under said gripping tab 716 and its pinching by a user. The peripheral flange 715 advantageously comprises, opposite the gripping tab 716, a holding portion 7151 (fixed) 35 similar to the holding portion 87 of the peelable membrane 8.

This peripheral flange 715 advantageously comprises a line of thinned material, arranged along the holding portion 7151 to form a hinge during the maneuver of the closure means 4. In practice, to access the packaged product, it suffices to the operator 5 to exert traction on the closure means 4 in the closed position, through: - the gripping portion 85 of the peelable membrane 8, or - the gripping tab 716 of the element cap 7 when alone.

This tensile force then causes the degradation of the degradable assembly means 5 and, where appropriate, the extraction of the plug element 7 with respect to its orifice 3 by uncoupling the repositionable assembly means 6. For close the container, it is sufficient for the user to return the closure means 4 in the closed position, automatically causing the implementation of the repositionable assembly means 6. Where appropriate, this closing maneuver is obtained by the introduction of the plug member 7 through its receiving orifice 3, allowing the implementation of the repositionable assembly means 20 6. Where appropriate, the holding portion 87, 7151 guides the pivoting maneuvering means shutter 4 between its two open and closed positions, thus ensuring a hinge role.

Manufacturing method The manufacture of such an easy opening device 1 according to the invention advantageously comprises the following successive operations: - the supply of the bottom element 2 provided with said at least one orifice 3, - the establishment of the means of shutter 4 on said bottom element 30 2, by the implementation of degradable assembly means 5 and repositionable assembly means 6. In the case of closure means 4 comprising a plug member 7 associated with a peelable membrane 8, the establishment of the closure means 4 advantageously comprises: - a placement of said plug member 7 through the orifice 3, by the implementation of the repositionable assembly means 6, then - a setting of said peelable membrane 8, by the implementation of degradable assembly means 5.

In this case, the use of degradable assembly means 5, advantageously heat-sealing, allows the peelable membrane 8 to be secured to the outer face 211 of the bottom element 2 and to the upper face 711 of the plug member 7. Alternatively, the establishment of the closure means 4 10 advantageously comprises: - establishment of said peelable membrane 8 by the implementation of degradable assembly means 5, and - a setting in place of said plug member 7 by introduction through an inner side of said orifice 3 (on the side of the inner face 212 of the bottom member 2), opposite said peelable membrane 8, by placing In this case, the plug member 7 consists for example of a liquid material at its removal, intended to solidify. 20

Claims (18)

REVENDICATIONS1. Easy-opening device for a metal container, which device (1) comprises: a) a bottom element (2), in which at least one through-hole (3) is provided, and b) shut-off means (4) adapted to close said at least one orifice (3) of said bottom member (2), which closure means (4) are secured to said bottom member (2) through degradable assembly means (5) which extend around said at least one orifice (3) and which are intended to be degraded by a first operation of said closure means (4) from a closed position, wherein said closure means (4) are able to close said at least one orifice (3), to an open position, wherein said closure means (4) are at least partially separated from said at least one orifice (3), characterized in that said means for shutter (4) are further secured to said bottom element (2) via repositionable assembly means (6) which are adapted to allow operation of said closure means (4) between said open and closed positions after said degradation of said degradable assembly means (5). 2. Easy-opening device according to claim 1, characterized in that the repositionable assembly means (6) comprise interlocking means, preferably by elastic deformation. 3. Easy-opening device according to claim 2, characterized in that the closure means (4) comprise at least one plug element (7) which is intended to be introduced through said at least one orifice (3), and in that said plug member (7) and said orifice (3) cooperate through the interlocking means (6). 4. Device for easy opening according to claim 3, characterized in that said at least one orifice (3) is delimited by a border (31), and in that said plug member (7) is made of at least one material adapted to undergo an elastic deformation to cooperate with said border (31) and to form together the interlocking means (6). 5. Easy-opening device according to claim 4, characterized in that said plug member (7) has a groove (721) 5 complementary to the edge (31) of the orifice (3) to form together the means of interlocking by elastic deformation (6). 6. Easy-opening device according to any one of claims 3 to 5, characterized in that the closure means (4) are constituted by said plug member (7) which is secured to the bottom element ( 2) through the degradable assembly means (5) and through the interlocking means (6). 7. Easy-opening device according to claim 6, characterized in that the plug element (7) comprises: an inner part (72) forming the interlocking means (6), an outer part (71). provided (i) with a peripheral collar (715) arranged opposite a peripheral band (218) extending around the periphery of said at least one orifice (3) and secured to said peripheral band (218) by means of degradable assembly means (5) to be degraded partially or totally and (ii) a gripping tab (716) for operating said plug member (7) from its closed position to its open position . 8. An easy-opening device according to claim 7, characterized in that the bottom element (2) has a concave portion (214) which is arranged facing the gripping tab (716) to facilitate its pinching. 9. Device for easy opening according to any one of claims 3 to 5, characterized in that the closure means (4) comprise: - the plug member (7) and 30 - a peelable membrane (8) comprising on the one hand, a closure portion (86) covering an upper face (711) of said plug member (7) and is secured to the bottom member (2) by the degradable assembly means (5) and on the other hand, a gripping portion (85) for operating said peelable membrane (8). 3029506 20 10. Easy-opening device according to claim 9, characterized in that the plug member (7) is: - independent of the peelable membrane (8), or - integral, integrally or reported, with the inner face 5 (82) of said peelable membrane (8), consisting for example of an extra thickness of said inner face (82). 11. An easy-opening device according to claim 9 or 10, characterized in that the bottom element (2) comprises a panel (21) defining a general plane (P) provided with a concave portion ( 214), offset on the side of an inner face (212) of said bottom member (2) and in which is provided said at least one orifice (3), and in that the cap member (7) has a face upper (711) extending between said general plane (P) and said concave portion (214). 12. An easy-opening device according to any one of claims 1 to 11, characterized in that the closure means (4) comprise a holding portion (87, 7151) which is secured in an irremovable manner with the element background (2). 13. Easy-opening device according to any one of claims 1 to 12, characterized in that the edge (31) of the orifice (3) 20 comprises a fold oriented towards an outer face (211) of the element of background (2). 14. An easy-opening device according to any one of claims 1 to 13, characterized in that the bottom element (2) consists of: a bottom element (2) intended to be fixed on an upper edge of a belt of walls, or - a bottom element (2) which is in one piece of a container body. 15. Container, particularly of the metal cans type, comprising an easy-open device (1) according to any one of the preceding claims. 16. Peelable membrane for a metal container, comprising an inner face (82) to be secured by degradable assembly means (5) with an outer face (211) of a bottom member (2) having at least one orifice (3), 3029506 21 characterized in that the inner face (82) of said membrane (8) comprises a plug element (7), monobloc or reported, intended to be introduced through at least one orifice (3 ) provided in said bottom element (2). 5 17. A method for manufacturing an easy-open device (1) according to any one of the preceding claims, which method comprises the following successive operations: - the supply of the bottom element (2) provided with said at least one orifice (3), 10 - the establishment of the closure means (4) on said bottom element (2), by the implementation of the degradable assembly means (5) and repositionable assembly means ( 6). 18. A method according to claim 17, in the case of closure means (4) comprising a plug member (7) associated with a peelable membrane (8), characterized in that the establishment of the closure means (4) comprises: either - placing said plug member (7) through the orifice (3), then - placing said peelable membrane (8); or - placing said peelable membrane (8), then - placing said plug member (7) by introducing through an inner side of said orifice (3), opposite said membrane 25 peelable (8).