PACKAGING DEVICE FOR A COSMETIC PRODUCT, IN PARTICULAR FOR A DEGASSING COSMETIC PRODUCT

Abstract

The device (3): a sealed flexible bag (7); a submerging tubular body (11) opening into the flexible bag (7) through a sampling orifice (15); and a valve (17) for sealing the sampling orifice (15). The valve (17) includes: a shutter (53) for sealing the sampling orifice (15), a core (55) engaged in the sampling orifice (15), a portion (57) provided with an elastic member (59) that recalls the valve (17) to the sealing position, with the shutter (53), core (55) and the end portion (57) consisting of a single piece.

Description

The invention relates generally to packaging devices for cosmetic products, particularly for degassing cosmetic products.

More specifically, the invention relates according to a first aspect a packaging device for a cosmetic product of the type comprising:

• • a sealed flexible bag
  • a submerging tubular body, passing through the flexible bag and with a sealed link to the flexible bag, with the submerging body internally defining a chamber opening into the flexible bag through a sampling orifice;
  • a valve able to adopt a sealing position for the sampling orifice and a release position of the sampling orifice.

Such a device is used for the packaging of liquid drugs, as described for example in EP 0 324 257. However, this document describes a submerging body and a valve that form a complex and expensive assembly.

In this context, the invention aims to propose a device for packaging a cosmetic product, which is less complex and less expensive.

For this purpose, the invention relates to a packaging device of the aforementioned type, characterized in that the device comprises a cosmetic product arranged in the flexible bag, and in that the valve comprises:

• • a shutter for sealing the orifice,
  • a core linked to the shutter and engaged in the orifice,
  • an end portion linked to the core, provided with an elastic member that recalls the valve to the sealing position,

with the shutter, core and the end portion consisting of a single piece.

The fact that the shutter, the core and the end portion are integrated into a single piece makes it possible to reduce costs and to simplify the construction of the device. It also makes it possible to simplify the assembly, by reducing in particular the number of parts to be assembled.

A cosmetic product means a product such as that defined in Council directive 93/35/EEC dated Jun. 14, 1993.

The cosmetic product is a fluid product, for example a liquid, a cream, an oil, a lotion, an emulsion. It is intended for makeup, or for skin care or for hair care or any other type of care.

The flexible bag is typically a plastic pocket. The pocket is entirely sealed with respect to the cosmetic product. For example, it is permeable to the gases released by the cosmetic product. Alternatively, it is sealed with regards to the gas released by the cosmetic product. It typically has only one orifice, through which the submerging body is engaged.

The pocket is made from any suitable material. For example, the pocket is a polyethylene pocket. The pocket consists of a single layer. Alternatively, the pocket consists of a multilayer material, and comprises for example a layer of polyethylene.

The submerging body has any type of section. For example, it has a circular section. Alternatively, it has an oval, rectangular, etc. section.

The submerging body is partially engaged inside the flexible bag. It therefore has a section engaged inside the flexible bag, and a section located outside the flexible bag. The edge of the opening that the submerging body passes through is linked to the submerging body by any means suited for forming a sealed connection with the cosmetic product and with the gas that may be released by the cosmetic product. For example, it is welded on the submerging body. Alternatively, it is glued on the submerging body. For example, the submerging body comprises at the junction between the internal and external sections an external flange whereon the flexible bag is fixed.

The valve is typically a piece of injected plastic material. The shutter is normally located outside of the chamber and the elastic member inside the chamber.

This arrangement is particularly advantageous when the cosmetic product releases gas. The pressure of the gas inside the flexible bag urges the valve to its sealing position. The gas therefore cannot escape through the orifice.

According to an advantageous characteristic of the invention, the chamber is sealed inwards of the flexible bag by a wall wherein is arranged the sampling orifice, with the wall having on a face turned inwards of the flexible bag a bearing surface against which the shutter is in sealed contact in sealed position of the valve, and on the face turned towards the chamber a bearing zone engaging with the elastic member to recall the valve to the sealing position.

The bearing surface has any suitable shape. For example, it has a tapered shape with a section that decreases towards the sampling orifice. The shutter in this case, also has a tapered portion, intended to engage with said bearing surface. In another embodiment, the bearing surface has an annular shape.

Advantageously, the sampling orifice is a slot with an elongated shape along a first direction, with the end portion of the valve shaped to be able to be introduced through the slot.

This makes it possible to assemble the valve easily.

Advantageously, the elastic member comprises two arms, with the bearing zone comprising two bearing surfaces arranged on either side of the slot and aligned according to a second direction that is substantially perpendicular to the first direction.

Such an arrangement is convenient. The elastic member does not disturb the flow of the cosmetic product through the sampling orifice.

Alternatively, the sampling orifice may not have a section in the shape of a slot, but a circular, rectangular, oval, three-arm or four-arm cross section, or any other section. The elastic member, alternatively, may comprise more than two arms, for example three arms, or more than three arms. The elastic member can also be conformed in the shape of a dish, with a continuous pressing all around the passage. In this case, it comprises one or several windows cut in the dish in order to allow for the passage of the cosmetic product.

Advantageously, the core is elongated along an axial direction, with the two arms able to be introduced initially through two side ends of the slot then displaced circumferentially about the axial direction to the bearing surfaces.

In other terms, the assembly of the non-return valve in the tubular body is done by introducing this valve through the sampling orifice, then by substantially carrying out a quarter turn in such a way as to place the arms perpendicularly to the first direction. Such an assembly is particularly convenient and is highly suited for a valve constituted of a single piece. The side ends of the slot correspond to the two ends of the slot opposite one another according to the first direction.

Advantageously, each bearing surface is adjacent to zones protruding with respect to said bearing surface and arranged circumferentially between said bearing surface and the lateral ends of the slot.

The protruding zones limit the circumferential clearance of the arms, and maintain the latter against the bearing surfaces. They in particular prevent the elastic arms from falling back into the slot.

For the assembly of the valve, elastic arms must pass over the protruding zones during the circumferential movement taking them from the first direction to the second direction. The height of the protruding zones, and the elasticity of the arms, are calculated so that the circumferential displacement of the arms from the side ends of the slot to the bearing surfaces is possible under the effect of a strong stress applied by a user, but that a displacement in the opposite direction is not possible in the absence of a stress applied by a user.

Advantageously, the end portion of the valve comprises a pressing part that extends the core beyond the two arms.

As such, when a member for sampling cosmetic products is engaged in a submerging body, it is easy to arrange the end of the sampling member so that this end presses against the pressing part and displaces the valve to its release position.

The pressing part can have any sort of shape, according to the sampling member provided to be engaged in the chamber.

Advantageously, the device comprises a removable cap that seals an end of the chamber located outside the flexible bag.

This cap therefore makes it possible to close the end of the chamber that is opposite the valve. As such, in the event where a small quantity of cosmetic product and/or gas were in the chamber, the gas and/or the cosmetic product remain confined inside the chamber. The cap is removed when a user wants to sample the cosmetic product.

The cap is mounted on the chamber by any type of suitable connection, for example by screwed connection, or a bayonet connection, etc.

Typically, the connection is sealed to the gases released by the cosmetic product.

Advantageously, the device comprises a rigid outer packaging around the flexible bag, with the submerging body passing through the outer packaging and being fixed to the outer packaging.

The outer packaging is for example made of carton, or any other suitable material. It makes it possible to prevent the cosmetic product from spilling, in the event of a leak of the flexible bag. This makes it possible to provide the packaging and distribution assembly with a neat appearance. In particular, to confer a stable shape to said assembly. The flexible bag, on the contrary, has a shape that varies as the cosmetic product is sampled.

The submerging body is fixed to the outer packaging by any means. For example, it comprises two external flanges that define between them a groove wherein is engaged an edge of the opening that the submerging body passes through. For example, the flexible bag is fixed to one of the two flanges.

According to a second aspect, the invention relates to an assembly for packaging and distribution a cosmetic product, with the assembly comprising a packaging device that has the characteristics hereinabove, and a member for sampling the cosmetic product suited to be engaged in the submerging body.

Advantageously, the sampling member is a syringe. Such a method of sampling is convenient and allows the user to not be in contact with the cosmetic product during sampling.

Advantageously, the sampling member comprises a syringe body provided to be engaged into the submerging body to a position of sampling, with a piston sliding inside the syringe body, an external sealing member interposed between the submerging body and the syringe body, and an internal sealing member interposed between the piston and the syringe body.

As such, the sampling of the cosmetic product is carried out very simply, by displacing the piston inside the syringe body.

The external sealing member is for example a lip carried by the syringe body or by the submerging body. The internal sealing member is for example a tip made of elastic material, fixed to an end of a piston. The two sealing members are typically made of natural or synthetic rubber.

Advantageously, the syringe body is the sampling position maintains the valve in the release position against the recalling force of the elastic member.

It is as such possible to sample the cosmetic product.

For example, an end of the syringe body presses against the pressing part of the valve and displaces the latter towards the wall of the chamber.

Advantageously, the assembly comprises a removable fastening of the syringe body to the submerging body.

The sampling of cosmetic products can as such be done very conveniently. The fastening makes it possible to maintain the syringe body in sampling position, and therefore to maintain the valve in its release position of the sampling orifice.

The fastening is of any suitable type. For example, the fastening is of the bayonet type, or of the screwed type, or of any other suitable type.

According to a third aspect, the invention aims to propose a method for assembling a device for packaging a cosmetic product that has the characteristics hereinabove, with the method comprising:

• • a step of engaging the valve through the sampling orifice according to an axial direction;
  • a step of locking the valve in the sampling orifice, by rotation of the valve with respect to the submerging body about the axial direction.

As such, the assembly of the valve on the submerging body is particularly simple.

Other characteristics and advantages of the invention will become clear from the detailed description given below, for guidance and in no way limitative, with reference to the appended drawings among which:

FIG. 1 is a cross-section view of an assembly for packaging and distributing cosmetic products in accordance with the invention, shown in a configuration where the syringe is not engaged in the submerging body;

FIG. 2 is a view similar to FIG. 1, with the syringe engaged in the submerging body; and

FIG. 3 is a front view of the wall of the submerging body carrying the sampling orifice.

The assembly 1 shown in FIGS. 1 and 2 is designed for the packaging and for the distribution of a cosmetic product. The cosmetic product is for example a decolorizing product for keratin fibers, such as hair or eyebrows. Such a product contains a compound that can oxidize in the presence of oxygen.

The assembly 1 comprises a packaging device 3 for the cosmetic product, and a member 5 intended to sample the cosmetic product stored in the device 3 for the purposes of its use.

The packaging device 3 comprises:

• • a sealed flexible bag 7;
  • preferably, a rigid outer packaging 9 around the flexible bag 7;
  • a submerging tubular body 11, passing through the flexible bag 7 and with a sealed link to the flexible bag 7, with the submerging body 11 internally defining a chamber 13 opening into the flexible bag 7 through a sampling orifice 15;
  • a valve 17 able to adopt a sealing position for the sampling orifice 15 and a release position of the sampling orifice 15;
  • a cosmetic product, not shown, arranged in the flexible bag 7.

The flexible bag 7 is a polyethylene pocket, impervious to the cosmetic product and not impervious to the gas released by the cosmetic product. For example, the pocket is formed from a polyethylene sheet. For example, the pocket is formed by folding the polyethylene sheet ad by welding the two half-sheets to one another.

The flexible bag 7 has a single opening 19, through which the submerging body 11 passes.

The outer packaging 9 is a carton box, of substantially parallelepiped shape. The submerging body 11 passes through the outer packaging. More precisely, the outer packaging 9 has an opening 21, positioned against the opening 19 of the bag 7, through which the submerging body 11 is engaged.

The submerging body 11 is typically a plastic injected part. It has a section 23 engaged in the polyethylene pocket and a section 25 located outside of the polyethylene pocket and outside of the outer packaging 9. The submerging body 11 has a central axis X. In the example shown, its straight section, perpendicular to the axis X, is circular.

The submerging body 11 comprises a tubular side wall 24 and an end wall 25 wherein the sampling orifice 15 is arranged. The end wall 25 seals the chamber inwards of the flexible bag 7. It is integral with an axial end of the tubular wall 24. The submerging body 11, at the axial end opposite the wall 25, is open.

The submerging body 11 further comprises an external flange 27 that extends radially from an external surface of the tubular wall 24. The flange 27 extends over the entire periphery of the submerging body 11. The flexible bag 7 is welded tight on the flange 27.

The submerging body 11 further comprises a second external flange 29, extending radially from an external surface of the tubular wall 24. The flanges 27 and 29 delimit between them a groove 31. The peripheral edge 33 delimiting the opening 21 of the outer packaging is engaged in the groove 31, as such linking the tubular body 11 to the outer packaging 9.

The end wall 25 comprises an annular peripheral zone 35 integral with the tubular wall 24, extended by a cylindrical neck 37. The cylindrical neck 37 is coaxial to the X axis. It protrudes with respect to the annual zone 35 outwards of the chamber 13. It is partially closed by a partition 39, substantially perpendicular to the axis X, wherein the sampling orifice 15 is cut out.

The partition 39 is axially offset inside the neck 37, in such a way that the free end 41 of the neck 37 protrudes with respect to the partition 39, opposite the chamber 13.

The free end 41 towards the inside of the neck 37, defines a substantially tapered sealing surface 43.

The valve 4 includes:

• • a shutter 53 for sealing the sampling orifice 15 in sealing position;
  • a core 55 linked to the shutter and engaged in the sampling orifice 15;
  • an end portion 57 linked to the core 55, provided with an elastic member 59 that recalls the valve to the sealing position.

In the example shown, the shutter 53 is a disk that has a beveled edge 61. The edge 61 has a tapered shape, complementary with that of the bearing surface 43. It engages with this bearing edge 43 in order to seal the passage 19 in sealing position. The shutter 53 further has a large upper face 63, opposite the partition 39. This large face, in sealing position, is level with the free end 41.

The core 55 extends along the axis X. It is for example with a circular section, or a cross section, or can have all sorts of other forms.

The shutter 53 is integral with a first axial end of the core, with the end portion 57 being integral with a second axial end of the core 55, opposite the first.

The elastic member 59 comprises two arms 65, diametrically opposite with respect to the axis X. The two arms 65 are inscribed substantially in the same plane containing the axis X. Each arm 65 has the shape of a claw. More precisely, each arm 65, in the embodiment shown in FIG. 1, comprises a first section extending radially outwards from the core 55, extended by a second section extending from the first section, radially outwards and axially towards the shutter 53.

The end portion 57 further comprises a pressing part 71, extending the core 55 axially beyond the arms 65. The pressing part 71 is inscribed substantially in the same plane as the two arms 65.

The sampling orifice 15, as can be seen in FIG. 3, is a slot that has a section, perpendicular to the axis X, extended along a first direction. This first direction D1 is materialized by a dotted line in FIG. 3. The bearing edge 43 surrounds the sampling orifice

The wall 25 has a bearing zone 73 that engages with the elastic member 59 in order to recall the valve to its sealing position. As can be seen in FIG. 3, the bearing zone comprises two bearing surfaces 75 arranged on either side of the slot and aligned according to a second direction D2 that is substantially perpendicular to the first direction D1. When the valve is mounted on the body, the free ends of the arms 65 are pressing against the bearing surfaces 75. The bearing surfaces 75 are arranged on a surface 76 of the partition 39 turned towards the chamber 13.

The bearing surfaces 75 are arranged in such a way that the two arms 65 of the valve are able to be introduced axially through the two side ends opposite the slot, then displaced circumferentially about the axial direction X until the bearing surfaces 75. The side ends of the slot are opposite one another according to the first direction D1.

In other terms, the two arms 65 are able to be introduced through the slot axially, with the two arms then being oriented in such a way as to be placed in a plane containing the axis X and the first direction D1. They are then pivoted in such a way as to be placed in a plane containing the axis X and the second direction D2.

So as to maintain the free ends of the arms on the bearing surfaces and prevent them from falling back into the slot 15, each bearing surface 75 is adjacent to two protruding zones 77, arranged on either side of the surface 75, circumferentially about the axis X between said bearing surface 75 and the side ends of the slot. The protruding zones protrude with respect to the bearing surfaces. They are delimited by the beveled edges 79, in such a way as to facilitate the crossing of the protruding zones 77 by the arms 65.

The device 3 further comprises a removable cap 81 (FIG. 1), sealing the end of the chamber 13, located outside the flexible bag. The cap 81 comprises a bottom 83 and a skirt 85 integral with and surrounding the bottom 83. The skirt 85 comprises an inner thread 87 engaging with an outer thread 89 arranged at the end of the section 23 of the submerging body.

The sampling member 5 (FIG. 2) is a syringe. The syringe 5 comprises a tubular syringe body 91 and a piston 93. The tubular body 91 comprises a tubular peripheral wall 95 delimiting an internal volume 97 wherein the piston 93 is displaced. The peripheral wall 95 is partially closed at one end by a perforated wall 99. It is open opposite the perforated wall 99. The tubular body 91 further comprises a cylindrical skirt 101, surrounding the end of the peripheral wall 95 opposite the perforated wall 99. The wall 95 and the skirt 101 are connected together by an annular material bridge 103.

The peripheral wall 95 has an outside diameter slightly smaller than the inside diameter of the tubular wall 24 of the submerging body.

The perforated wall 99 comprises a plurality of holes 105, cut around a central solid zone 107. The central zone 107 carries a cylindrical rib 109, standing outwards of the internal volume 97.

The piston 93 comprises a head 111 engaged in the volume 97, a grasping portion 113 and a rod 115 connecting the head 111 to the grasping portion 113. The head 111 carries a sealing member 117. A chamber for sampling a variable volume is delimited between the head 111 and the perforated wall 99. The volume of the chamber varies according to the displacement of the piston along the body of the syringe. The head is constantly tightly pressing against the peripheral wall 95, by the intermediary of the sealing member 117.

The piston body 91 carried another sealing member 119, formed from a lip located substantially along the junction line between the peripheral wall 95 and the perforated wall 99. The lip 119 protrudes outwards with respect to the peripheral wall 95, and surrounds the latter over its entire periphery.

The assembly further comprises a removable fastening of the syringe body to the submerging body, not shown. This fastening is for example of the bayonet type. It connects an internal face of the skirt 101 with an external face of the section 23 of the submerging body.

Details on the manufacture of the assembly hereinabove shall now be given.

The cosmetic product is first placed in the bag 7, then this bag 7 is closed in such a way that only the opening 19 remains.

The submerging body 11 is manufactured by injecting a plastic material. The valve 17 is also manufactured by injecting a plastic material.

The valve 17 is then mounted on the submerging body 11. It is first placed in an orientation wherein the arms 65 are located in a plane containing the axis X and the first direction D1. It is then displaced axially until the section 61 presses against the bearing surface 43. The pressing part 71 and the arms 65 then protrude under the partition 39. An operator then grasps the valve by the intermediary of the pressing part 71 and rotates it one-quarter turn in such a way as to place the arms 65 according to the second direction D2. During this movement of rotation about the axis X, the arms 65 must pass over the protruding zones 77 before reaching the bearing surfaces 75. The crossing of the protruding zones is assisted due to the fact that these zones have beveled edges 79. Once the arms 65 are pressing against the bearing surfaces 75, these arms 65 stress the shutter 53 against the sealing surface 43.

The submerging body 11 is then partially introduced into the flexible envelope 7, and the peripheral edge of the opening 19 is welded on the flange 27. Then, the edge 33 of the opening 31 of the outer packaging 9 is engaged in the groove 31. Finally, the cap 81 is screwed to the end of the submerging body 11.

The syringe body 91 and the lip 119 are injected in one piece. The piston 93 is also injected in one piece. The sealing member 117 is then mounted on the head of the piston and the head of the piston is engaged in the volume 97 delimited by the syringe body.

Details on the operation of the packaging and distributing assembly will now be described.

As long as it is not necessary to sample the cosmetic product outside of the bag 7, the cap 81 remains in place and closes the chamber 13 delimited by the submerging body 11. The arms 65 maintain the valve in its sealed position of the sampling orifice.

When a user wants to sample the cosmetic product, the user begins by unscrewing the cap 81 and separates it from the submerging body 11.

It then engages the syringe 5 inside the submerging body. It engages the syringe in such a way that the perforated wall 99 is turned towards the terminal wall 25 of the submerging body. The user presses the syringe body 91 inside the submerging body, practically over its entire length. The user continues this movement until the free edge of the submerging body 11 abuts against the bridge of material 103 that connects the skirt 101 to the syringe body. He then fastened the syringe body to the submerging body by the intermediary of means for fastening provided for this purpose, for example by carrying out a slight rotation of the syringe body with respect to the submerging body in the case of a bayonet fastening.

The syringe body is then axially blocked with respect to the submerging body, parallel to the axis X. In this situation, the peripheral wall 95 extends in the immediate vicinity of the tubular wall 24. The lip 119 provides the seal between the two walls.

As shown in FIG. 2, in this position, the solid zone 107 of the perforated wall is pressing against the pressing part 71. The valve is then blocked axially in its release position of the sampling orifice. In order to sample the cosmetic product, the user grasps the grasping portion 113 of the piston and pulls the piston along the axis X, in such a way as to separate the head 111 of the piston of the perforated wall 99. The cosmetic product is then aspirated through the sampling orifice 15, and through the holes 105 until in the sampling chamber, i.e. between the head of the piston and the perforated wall 99. The user continues to displace the piston until the desired quantity of the cosmetic product is sampled.

The user then separates the syringe 5 from the submerging body 11, and puts the cap 81 back in place. The valve 17 returns to its sealing position of the sampling orifice under the effect of the recalling force of the arms 65.

Claims

1. Packaging device for a cosmetic product, the device comprising: and wherein the valve comprises: with the shutter, the core and the end portion consisting of a single piece.

a sealed flexible bag;

a submerging tubular body, passing through the flexible bag and with a sealed link to the flexible bag, with the submerging body internally defining a chamber opening into the flexible bag through a sampling orifice;

a valve able to adopt a sealing position for the sampling orifice and a release position of the sampling orifice;

wherein the device comprises a cosmetic product arranged in the flexible bag;

a shutter for sealing the sampling orifice,

a core linked to the shutter-and engaged in the sampling orifice,

an end portion linked to the core, provided with an elastic member that recalls the valve to the sealing position,

2. Device according to claim 1, wherein the chamber is sealed inwards of the flexible bag by a wall in which the sampling orifice is arranged, the wall having on a face turned inwards of the flexible bag a bearing surface against which the shutter is in sealed contact in the sealed position of the valve, and having on a face turned towards the chamber a bearing zone engaging with the elastic member to recall the valve to the sealing position.

3. Device according to claims claim 1, wherein the sampling orifice is a slot extended along a first direction, the end portion of the valve being shaped to be able to be introduced through the slot.

4. Device according to claim 2, wherein the sampling orifice is a slot extended along a first direction, the end portion of the valve being shaped to be able to be introduced through the slot, and wherein the elastic member comprises two arms, the bearing zone comprising two bearing surfaces arranged on either side of the slot and aligned according to a second direction that is substantially perpendicular to the first direction.

5. Device according to claim 4, wherein the core is elongated along an axial direction, the two arms being able to be introduced axially through two side ends of the slot then displaced circumferentially about the axial direction to the bearing surfaces.

6. Device according to claim 5, wherein each bearing surface is adjacent to zones protruding with respect to said bearing surface and arranged circumferentially between said bearing surface and the lateral ends of the slot.

7. Device according to claim 4, wherein the end portion of the valve comprises a pressing part that extends the core beyond the two arms.

8. Device according to claim 1, it which comprises a removable cap sealing an end of the chamber located outside the flexible bag.

9. Device according to claim 1, which comprises a rigid outer packaging around the flexible bag, with the submerging body passing through the outer packaging and being fastened to the outer packaging.

10. Assembly for packaging and distributing a cosmetic product, comprising a packaging device according to any of the preceding claims, and a member for sampling the cosmetic product suited to be engaged in the submerging body.

11. Assembly according to claim 10, wherein the sampling member is a syringe.

12. Assembly according to claim 10, wherein the sampling member comprises a syringe body provided to be engaged in the submerging body until a sampling position and a piston sliding inside the syringe body, the syringe body in sampling position maintaining the valve in release position against the recalling force of the elastic member.

13. Assembly according to claim 12, wherein the sampling member comprises an external sealing member interposed between the submerging body and the syringe body, and an internal sealing member interposed between the piston and the syringe body.

14. Assembly according to claim 12, which comprises a removable fastening of the syringe body to the submerging body.

15. Method for assembling a device according to claim 1, the method comprising the following steps:

a step of engaging the valve through the sampling orifice according to an axial direction;

a step of locking the valve in the sampling orifice, by rotation of the valve with respect to the submerging body about the axial direction.

16. Device according to claim 2, wherein the sampling orifice is a slot extended along a first direction, the end portion of the valve being shaped to be able to be introduced through the slot.

17. Device according to claim 5, wherein the end portion of the valve comprises a pressing part that extends the core beyond the two arms.

18. Device according to claim 6 wherein the end portion of the valve comprises a pressing part that extends the core beyond the two arms.

19. Device according to claim 2, which comprises a removable cap sealing an end of the chamber located outside the flexible bag.

20. Device according to claim 3, which comprises a removable cap sealing an end of the chamber located outside the flexible bag.