FR2804414A1 - Sealing ball for pressurized cosmetic container dispenser is placed freely inside plunger tube which is deformable to form ball retaining zone - Google Patents

Abstract

The container (2) for a pressurized cosmetic (P) has a dispensing part (5) on top with a body (9) connected to a plunger tube (12). A sealing ball (14) is placed freely inside the plunger tube so as to selectively interrupt communication between the tube and the dispensing body. The plunger tube is deformable so as to form a ball retaining zone (20) inside the tube.

Description

DEVICE COMPRISING A FREE SHUTTER ELEMENT INSIDE A PLUNGER TUBE AND METHOD OF MOUNTING AN ABUTMENT ELEMENT INSIDE A PLUNGER TUBE The present invention relates to a device for packaging and dispensing under pressure of a product, in particular cosmetics. The invention applies in particular to dispensing devices of the valve type, in which the product is pressurized inside a can, by means of a propellant gas, liquefied or not. The invention also applies to manually operated pump type dispensing devices, particularly when it comes to being able to use them both head-up and head-down. The invention further relates to a method for ensuring the retention of a closure member, in particular a ball, freely mounted inside a dip tube.

In the field of aerosols, containing a product pressurized by means of a propellant gas, there are some whose normal operating position is the head-up position. In this position, the thruster, located above the surface of the liquid, pressurizes the latter towards the bottom of the container, in the vicinity of which is the inlet port of a plunger tube for conveying the product under pressure in a valve body via an inlet port of the latter. When the device is turned over, that is to say in the head-down position, it is the propellant gas that is placed in communication with the inlet orifice of the dip tube, so that, when actuated of the valve, only the gas is dispensed. This distribution of gas in the atmosphere, in addition to pollution, and the risks related to the toxicity of certain gases, for the one who breathes them, is detrimental to the proper functioning of the device insofar as this gas distribution accompanied by a pressure drop inside the container. The residual pressure may then be insufficient to dispense the product remaining in the container, so that part of the product can not be used.

To solve this problem, it has been proposed in patent application FR-A-2,680,161 to arrange a ball freely inside the dip tube. In the head-up position of the device, the ball is located at a distance from the inlet of the valve body, so that when the valve is actuated, the product can be dispensed normally. By reversing the head-down device, the ball sealingly closes the inlet port of the valve body. Thus, the communication between the dip tube and the valve body is interrupted, and the gas can not be dispensed. Means are provided to provide micro-leakage, allowing the ball to take off from its seat when the device is returned to the head-up position.

According to this document, the ball is held in the tube by means of a closed bottom of the dip tube. Openings are made in the tube above the ball so as to allow communication of the container with the dip tube. By design, such a tube must be formed by molding, or by using an attached bottom, which significantly increases the manufacturing cost.

Document FR-A-1 576 001, it is known to mount a ball in a dip tube, placing the ball in an auxiliary device, force-fitted on the free end of the dip tube. With such a design, the mounting is complicated, and because of this, the manufacturing cost is high.

In the field of manually operated pumps, there are some pumps designed to work both head-up and head-down. In this type of pump, the pump body has two inputs. One is connected to a dip tube whose free end is disposed substantially at the bottom of the container so as to pump the liquid from the bottom of the container when it is arranged head-up. The other is located directly adjacent the pump body so as to pump the liquid when the container is arranged head-down. The proper functioning of such a system implies that the first inlet of the valve body is isolated from the container when pumping is from the second inlet, and vice versa. With regard to the selective sealing of the inlet of the pump body connected to the dip tube, one solution is to dispose, freely inside the dip tube, a ball which, in the head-up position of the container is located at a distance from the inlet of the pump body, so as to allow communication between the pump body and the plunger tube. In the head-down position of the container, the ball is in sealing or quasi-tight support on a seat formed in the vicinity of the inlet port of the pump body. In this position, the communication between the dip tube and said pump body inlet is interrupted.

There then arises the same problem as that mentioned above with reference to the aerosol devices, namely, the retention of the ball inside the dip tube, and without significantly increasing the cost of manufacturing such a device.

Also, is it an object of the invention to provide a device for packaging and dispensing under pressure of a product, of the type comprising a dip tube in which is freely disposed a ball adapted to form a valve, and which solves all or part of the problems discussed above with reference to conventional devices.

It is in particular an object of the invention to provide such a device whose operation is reliable, and whose implementation is simple and economical to implement, particularly in an industrial manner. Indeed, such a device does not require the addition of any additional room.

It is yet another object of the invention to provide a simple and economical method to implement, to ensure the retention of a closure element, in particular a ball, mounted freely inside of a dip tube.

Still other objects will appear in the following detailed description.

According to the invention, these objects are achieved by producing a device for the packaging and dispensing under pressure of a product, in particular a cosmetic product, comprising a container surmounted by a dispensing member having a body connected to a dip tube opening into the container, a sealing member, in particular a ball, being freely disposed inside the dip tube so as to selectively interrupt the communication between the dip tube and the body of the dispenser member, said dip tube being deformed / folded so as to form at least one retaining zone of the closure member within the plunger tube. In some cases, a simple deformation / folding operation, in particular by stamping or stamping the dip tube, will be enough to create the retaining zone. Preferably, however, the retaining zone will be delimited at least in part by at least one cut made in a suitable manner to promote folding of the tube.

The free disposition of the closure member inside the plunger tube means its ability to move freely over at least a portion of the axial height of the tube.

With such a design, the dip tube can be extruded to the kilometer, then cut to the desired length. Any cutting operations, as well as deformation / folding can be performed automatically on the assembly machine, before or after the installation of the ball. The shutter element, freely disposed inside the dip tube, is suitably configured so that it does not disturb the passage of the fluid inside the tube, in particular with respect to the flow rate of the tube. product. The same applies to the retaining zone of the tube, which zone must not oppose the passage of the product.

For the purposes of the present invention, the term "deformed / folded" translates the result of an operation, carried out hot or cold, and aimed, in response to a mechanical stress, to force the material to deform (or bend, depending on the degree and shape of the deformation) irreversibly. Irreversibility refers to the ability of deformation or folding to subsist even when the stress that caused it ceases. Depending on the material forming the dip tube, the initial shape can be found, in whole or in part, by applying a constraint opposite to that which caused the deformation.

In the case of a dip tube, which may be made in particular of polyethylene or polypropylene, the irreversible nature of the deformation or folding results from the significant curvature to which the material is subjected, which curvature causes "damage" to the structure itself of the material. Such "damage", in the case of a plastic material can sometimes, depending on the severity of the deformation, be visualized by a whitening of the material, at the level of the "deformation / folding" zone. Alternatively, the irreversible nature can be improved by one or more welds of the "deformation / folding" zone.

Advantageously, the closure element is able to pass from a first position in which it is disposed at a distance from a seat formed in the vicinity of an inlet orifice of the body of the dispensing member, to a second position in which it rests on said seat so as to interrupt the communication between the plunger tube and the body of the dispenser member. Preferably, the first position corresponds to a head-up position of the device, the second position corresponding to a head-down position of the device.

In some cases, it may be desirable to provide means for, in the second position of the closure member, to create a micro-leakage between the seat and the closure member, so as to promote the return of the shutter element from the second position to the first when the device is returned to the head-up position. Such means, by balancing the pressures on either side of the closure element allow a reliable and rapid return of the valve or the pump in the normal operating position. Such a micro-leakage can be obtained in particular by imparting a state of appropriate surface to the closure element, or by providing micro-slots or orifices on the seat of the closure element.

Alternatively, it is possible to provide, in case of "bad" use of the device, permanently block the operation. In this case we will seek the best possible seal between the shutter element and its seat.

Preferably, a push button is provided for the actuation of the dispenser member, said push button comprising at least one outlet port of the pressurized product. Such an outlet may be provided in a nozzle, a grid, a sinter, or any other suitable diffusion element. According to a first version of the device according to the invention, the dispensing member consists of a valve, said product being pressurized inside the container by means of a propellant gas immiscible with the product to be dispensed. In the normal position of use, the gas is located substantially above the liquid, and pressurizes the liquid towards the bottom of the container.

According to a second version of the device according to the invention, the dispensing member consists of a manually operated pump operable in said first and second positions of the closure member.

The holding zone may be formed of a cut portion of the dip tube, said cut portion being bent inwardly of the dip tube. Preferably, the retaining zone is formed in the vicinity of the free end of the tube.

The free end of the dip tube may have a cutout extending transversely to an axis of the dip tube, said cutout being formed at a distance from an end edge of the dip tube, the portion of the dip tube located between the cut and the end edge being deformed / folded radially inwardly of the plunger tube so as to form a retaining zone of the closure member within the plunger tube.

Alternatively, the strip formed between said cutout and said end edge may be cut longitudinally, substantially in the middle, over the entire axial height of the strip so as to form two strip portions whose free ends are deformed / folded towards the end. interior of the plunger tube to form two retention zones of said closure member within the plunger tube.

Preferably, the dip tube is of circular section, said cutout extending over an angular opening of between 150 and 220, and preferably close to 180. The end edge may extend in a plane substantially perpendicular to the axis of the plunger tube. Alternatively, the end edge extends in an oblique plane with respect to the axis of the plunger tube.

According to another variant, an end edge of the tube is cut in an oblique plane with respect to the axis of the plunger tube, said cut end edge having a distal portion, and a proximal portion opposite the distal portion. , a zone for retaining the closure element inside the plunger tube being obtained by deformation / folding of the distal portion of said end edge, inside the plunger tube, towards the distribution.

For the purposes of the present invention, the distal portion of the end edge is the part farthest from the dispensing member. The proximal portion of the end edge is the nearest portion of the dispenser member.

Preferably, the distal portion of said end edge is deformed / folded around a folding zone located at an axial height intermediate between said distal and proximal portions of the end edge.

Alternatively, a cut extending longitudinally from the distal portion of the end edge in which it opens out, a zone for retaining the closure element inside the plunger tube being obtained by deformation / bending at the end the interior of the dip tube, in the direction of the dispenser member, a portion of the end edge located on one side of said cutout. Said cut can extend to an end located at an axial intermediate level between said distal and proximal portions of the end edge, said end edge portion being deformed / folded around a folding area in the vicinity of said end of the blank.

According to another aspect of the invention, a method is also provided for ensuring the retention of a closure element, in particular in the form of a ball, inside a dip tube fitted to a device for packaging and the pressure distribution of a product, said method consisting in deforming / folding the dip tube, possibly after having made at least one adequate cutting, so as to form at least one retaining zone of the closure element to inside the dip tube. Preferably, the holding zone is located in the vicinity of the free end of the tube.

The method may consist of a) producing in the dip tube two cutouts extending transversely to an axis of the dip tube on a portion of its section; and b) fold / deform inwardly of the tube, the portion of strip separating the two cutouts.

The two cuts are preferably parallel and made at a short axial distance from each other (typically from 1 to 5 mm). They can extend over an angular aperture of about 180.

Alternatively, the method may consist of a) producing in the free end of the plunger tube a cutout extending transversely to an axis of the plunger tube, said cutout being formed at a distance from an end edge of the plunger tube; and b) deforming / bending radially inwardly of the dip tube, the portion of the dip tube located between the cutout and the end edge, so as to form a retention zone of the shutter member therein of the dip tube.

According to a second alternative, the method consists of a) producing in the free end of the plunger tube a cutout extending transversely to an axis of the plunger tube, said cutout being formed at a distance from an end edge of the plunger tube; b) longitudinally cut the strip formed between said cutout and said end edge, substantially in the middle, over the entire axial height of the strip so as to form two strip portions; and c) deforming / folding inwardly of the dip tube the free ends of said strip portions so as to form two retaining regions of said closure member within the dip tube. According to a third alternative, the method consists in a) cutting an end edge of the tube in an oblique plane relative to the axis of the plunger tube, said end edge thus cut having a distal portion, and a proximal portion, opposite to the distal part; and b) deforming / bending the distal portion of said end edge within the plunger tube toward the dispenser member.

According to a fourth alternative, the method consists in a) cutting an end edge of the tube in an oblique plane relative to the axis of the plunger tube, said end edge thus cut having a distal portion, and a proximal portion, opposite to the distal part; b) performing a longitudinal cut extending from the distal portion of the end edge into which it opens; and c) deforming / folding a portion of the end edge located on one side of said cutout inside the plunger tube, towards the dispenser member.

The cut made in step b) can extend to an end located at an axial intermediate level between said distal and proximal portions of the end edge, said end edge portion being deformed / folded around a folding zone located in the vicinity of said end of the blank. The invention consists, apart from the arrangements set out above, in a certain number of other arrangements which will be explained below, with reference to nonlimiting exemplary embodiments, described with reference to the appended figures, among which - FIGS. 1A-113 illustrate a first embodiment of a device according to the invention, of the valve type; FIGS. 2A-213 illustrate a second embodiment of a device according to the invention, of the pump type, and FIGS. 3-7 illustrate various configurations of the free end of a dip tube such that it can be used in the devices of Figures 1A-1B and 2A-2B. The device 1 illustrated in FIGS. 1A and 1B is an aerosol device of the type comprising a can 2, in particular of aluminum or of thermoplastic material. The can 2 comprises a body 3, one end of which is closed by a bottom 4, and whose other end defines an opening on the free edge of which a valve 5 is mounted, via a valve gate cup 6. The valve is surmounted by a push button 7 for actuating the valve, and dispensing the product through at least one outlet orifice 8. The valve 5 comprises a valve body 9 connected to an inlet passage 10 in the form of a a sleeve whose free edge delimits an inlet orifice 11. On the sleeve defining the inlet passageway 10, a pressure tube 12 is inserted by force, made of polyethylene or polypropylene, and a free end 13 of which is located substantially at the bottom 4 of the can 2.

In the can 2, is disposed the liquid product to be dispensed P, especially a styling product, which is pressurized by a propellant gas G which, in the top position of the device, is in the upper part of the container 2, above of the free surface of the product. For example, it may be compressed air or any other suitable gas.

In this position of FIG. 1A, the plunger tube 12 is in communication with the pressurized product P, via its free end 13. Inside the plunger tube, there is a ball 14 which, in the top position of the device, rests near the free end of the dip tube, without disturbing the communication between the product and the dip tube. In practice, depending on the respective density of the product to be dispensed and the ball 14; the latter can be suspended anywhere inside the dip tube, away from the inlet orifice 11. The essential thing is that, in this position, the ball is not in sealing engagement with the inlet port 11 of the valve body 9, and it does not interfere with the rise of the product in the dip tube. The retention of the ball 14 inside the dip tube is obtained by a portion cut and folded 20 of the free end of the dip tube. This will be the subject of a more detailed description in the following description. In this position of FIG. 1A, by actuating the valve 5, by means of the push-button 7, the product P, pressurized by the gas, rises in the plunger tube 12 via its free end 13, penetrates into the valve body 5, and is distributed under pressure via the outlet orifice 8 of the pushbutton 7.

By turning the device 1 in the manner illustrated in FIG. 1B, the open end 13 of the plunger tube 12 is no longer in communication with the product P, but with the gas G. In this position, and under the pressure of the product , the ball 14 is pressed against the inlet orifice 11 of the valve body, and prevents the distribution of the gas alone. A micro-leakage may be formed between the ball 14 and the free edge delimiting the inlet orifice 11 of the valve body 9, so that, by turning the can 2 in the position of FIG. 1A, the pressures between the Valve body and the dip tube, balance and allow the ball to take off from its seat.

The device 101, shown in Figures 2A and 2B, is a device of the type comprising a container 102, in particular of thermoplastic material. The can 102 comprises a body 103 whose end is closed by a bottom 104, and whose other end defines an opening on the free edge of which is mounted a pump 105, via a cup 106. The pump can be mounted on the container 102 by other conventional means, in particular by breakdown or screwing. The pump is surmounted by a push button 107 for actuating the valve, and the dispensing of the product through at least one outlet orifice 108. The pump 105 comprises a pump body 109 connected to a passage of 110 in the form of a sleeve, a free edge defines an inlet 111. On the sleeve defining the inlet passage 110, is force-fitted, a dip tube 112, polyethylene or polypropylene, and one end free 113 is located substantially at the bottom 104 of the can 102.

The pump body 109 also comprises another orifice 130 which, in the upward position of the device 101, is closed off by a ball 131. The ball 131 is disposed in a housing 133 which is in communication with the inside of the body of the body. pump 109 via a second inlet port 132. In this head position at the top of the device, and in the absence of actuation of the pump 105, the orifice 130 is closed by the ball 131, and the orifice of entrance 132 is clear.

In the can 102 is disposed the liquid product to be dispensed P, including body milk or shampoo.

In this position of FIG. 2A, the plunger tube 112 is in communication with the product P, via its free end 113. Inside the plunger tube, there is a ball 114 which, in the top position of the device, rests in the vicinity of the free end 113 of the dip tube, without however disturbing the communication between the product and the dip tube 112. In practice, depending on the respective density of the product to be dispensed and the ball 114, the latter may be in suspension anywhere inside the dip tube, away from the inlet orifice 111. The essential thing is that, in this position, during suction, the ball does not come into sealing engagement on the inlet port 111 of the pump body 109, and that it does not interfere with the rise of the product in the plunger tube. The retention of the ball 114 inside the dip tube is obtained by a cut and folded portion 120 of the free end of the dip tube. This will be the subject of a more detailed description in the following description.

In the position of FIG. 2A, by pressing the push button 107, the product contained in the pump body 109 is pressurized and distributed via the outlet orifice 108. For this purpose, unidirectional valves (not shown) prevent the backflow. the product in the container 102 via the orifices <B> 132, </ B> 130 and 111. By releasing the pushbutton 107, under the effect of the depression inside the pump body 109, the ball 131 is position in sealing engagement on the inlet port 132 of the pump body 109, and prevents air located above the product P, to be sucked into the pump body and to impair the proper functioning of the pump 105. At the same time, the product sucked into the bottom of the container, goes back into the plunger tube 112 via its free end 113; and enters the pump body 109 via the inlet port 111.

Turning the device 1 in the manner illustrated in FIG. 2B, the free end 113 of the plunger tube 12 is no longer in communication with the product P, but with the air located above the product P. In this position, at the suction, the ball 114 is pressed against the inlet orifice 111 of the valve body 109. At the same time, the ball 131 releases both the orifices 130 and 132 of the pump body 109. By depressing the push button, the product is dispensed under pressure via the dispensing orifice 108. Again, the presence of the unidirectional valves (not shown) prevents the discharge of the product P into the container. By releasing the pressure on the push button 107, the product P enters the valve body 109 via the orifices 130 and 132, the orifice 111 being closed by the ball 114. There is thus a pump operating at the same time head up and upside down.

FIGS. 3-7, to which reference is now made, illustrate various retaining means inside the plunger tube.

In the embodiment of Figure 3, the free end 13 of the plunger tube 12 has a cutout 200 extending transversely to an axis X of the plunger tube 12. The cutout 200 extends over an angular opening of about 180 and is formed away from an end edge 201 of the plunger tube 12, the portion 202 of the plunger tube 12 located between the cutout 200 and the end edge 201 being deformed / folded radially inwardly of the plunger tube so as to form a retention zone 20 of the ball 14 inside the plunger tube 12. This folded portion 20 creates a section reduction of the plunger tube 12, sufficient to retain the ball 14. In addition, it does not interfere with the entry of the product inside the tube 12. In this embodiment, the edge 201 extends in a plane perpendicular to the axis X.

In the embodiment of Figure 4 the free end 13 of the plunger tube 12 has a cutout 200 extending transversely to an axis X of the plunger tube. The cutout 200 extends over an angular aperture of about 180, and is formed at a distance from an end edge 201 of the plunger tube 12, the strip formed between said cutout and said end edge then being cut longitudinally, substantially in the middle, over the entire axial height of the strip so as to form two strip portions 203, 204 whose free ends 205, 206, are deformed / folded towards the inside of the plunger tube 12 so as to form two zones 20, 21 of said shutter member inside the plunger tube 12. In this embodiment, the edge 201 extends in a plane perpendicular to the axis X.

The embodiment of FIG. 5 differs from the previous one in that the end edge 201 extends in an oblique plane with respect to the axis X of the plunger tube 12.

In the embodiment of Figure 7, the end edge 201 of the tube 12 is cut in an oblique plane relative to the axis X of the plunger tube. The end edge 201 thus cut has a distal portion 207, and a proximal portion 208, diametrically opposite to the distal portion. A retention zone 20 of the closure element inside the plunger tube 12 is obtained by deformation / folding of the distal portion 207 of said end edge 201, inside the plunger tube 12, in the direction of the distribution organ. The free end of the folded portion 20 is located inside the dip tube, beyond the distal portion 208 of the end edge, thus making it more difficult to inadvertently unfold the portion 20.

The end edge 201 is deformed / folded around a folding zone located at about mid-height between the distal portion 207 and the proximal portion 208 of the end edge 201.

In the embodiment of FIG. 8, the end edge 201 of the tube 12 is cut in an oblique plane relative to the axis X of the plunger tube 12. The end edge 201 thus cut out has a distal portion 207 and a proximal portion 208, diametrically opposed to the distal portion 207, a cutout 209 extending longitudinally from the distal portion 207 of the end edge 201 into which it opens. A retention zone 20 of the closure element inside the plunger tube 12 is obtained by deformation / folding inside the plunger tube 12, in the direction of the dispensing member, of a portion 210 of the end edge 201 located on one side of said cutout 209. The free end of the folded portion 20 is located inside the dip tube, beyond the distal portion 208 of the end edge, thus making more difficult inadvertent unfolding of the part 20.

Preferably, the cutout 209 extends to about mid-height between said distal 207 and proximal portions 208 of the end edge. The end edge portion 210 being deformed / folded around a folding zone located in the vicinity of said end of the cutout 209.

The description of FIGS. 3 to 7 has been made using as a numerical reference of the dip tube the reference of the dip tube 12 used in the valve device of FIGS. 1A and 1B. It is clear that these same configurations of the free end of the dip tube are also applicable to the pump device of FIGS. 2A and 2B.

In the foregoing detailed description, reference has been made to preferred embodiments of the invention. It is obvious that variations may be made without departing from the spirit of the invention as claimed hereinafter.

Claims (1)

1. - Device (1, 101) for packaging and dispensing under pressure of a product (P), including cosmetic, comprising a container (2, 102) surmounted by a dispensing member (5, 105) having a body (9, 109) connected to a dip tube (12, 112) opening into the interior of the container, a closure element (14, 114), in particular a ball, being freely disposed inside the dip tube (12, 112) to selectively interrupt the communication between the plunger tube (12, 112) and the dispenser member body (9, 109), the plunger tube (12, 112) being deformed / folded forming at least one retaining region (20, 21) of the closure member (14, 114) within the plunger tube (12, 112). 2. - Device according to claim 1 characterized in that the (or) zone (s) retaining (20, 21) is (are) delimited (s) at least in part, by at least one cutout (200, 209 ) of the dip tube. 3. - Device according to claim 1 or 2 characterized in that said retaining zone (20, 21) is formed in the vicinity of a free end of the dip tube. 4. - Device (1, 101) according to any one of claims 1 to 3 characterized in that the closure member (14, 114) is adapted to move from a first position in which it is arranged remotely a seat formed in the vicinity of an inlet (11, 111) of the body (9, 109) of the dispensing member (5, 105), at a second position in which it rests on said seat of in order to interrupt the communication between the dip tube (12, 112) and the body (9, 109) of the dispensing member (5, 105). 5. - Device (1, 101) according to claim 4 characterized in that the first position corresponds to a head-up position of the device (1, 101) and in that the second position corresponds to a head-in position. the bottom of the device (1, 101). 6. - Device (1, 101) according to claim 5 characterized in that means are provided for, in the second position of the closure member (14, 114), to create a micro-leak between the seat and the shutter member (14, 114) so as to promote the return of the shutter member (14, 114) from the second position towards the first when the device (1, 101) is returned to the head position. up. 7. - Device (1, 101) according to any one of claims 1 to 6 characterized in that it comprises a push button (7, 107) for actuating the dispensing member (5, 105), said push button (7, 107) comprising at least one outlet (8, 108) of the product (P) under pressure. 8. - Device (1) according to any one of claims 1 to 7 characterized in that the dispensing member consists of a valve (5), said product (P) being pressurized inside the container ( 2) by means of a propellant gas (G) substantially immiscible with the product to be dispensed. 9. - Device (101) according to any one of claims 1 to 7 characterized in that the dispensing member consists of a manually operated pump (105) adapted to operate in said first and second positions of the shutter member (14, 114). 10. - Device (1, 101) according to any one of claims 1 to 9 characterized in that the free end (13 ,, 113) of the plunger tube (12, 112) has a cutout (200) extending transversely to an axis (X) of the dip tube, said cutout (200) being formed away from an end edge (201) of the dip tube (12, 112), the portion (202) of the dip tube (12, 112) between the cutout (200) and the end edge (201) being deformed / folded radially inwardly of the plunger tube (12, 112) so as to form a retention zone (20) of the element shutter (14, 114) within the plunger tube (12, 112). 11. - Device (1, 101) according to any one of claims 1 to 9 characterized in that the free end (13, 113) of the plunger tube (12, 112) has a cutout (200) extending transversely to an axis (X) of the dip tube, said cutout (200) being formed at a distance from an end edge (201) of the dip tube, the strip formed between said cutout (200) and said end edge (201 ) being cut longitudinally, substantially in the middle, over the entire axial height of the strip so as to form two strip portions (203, 204) whose free ends (205, 206) are deformed / folded towards the inside of the strip. dip tube so as to form two retention zones (20, 21) of said closure member (14, 114) inside the dip tube (12, 112). 12. - Device (1, 101) according to claim 10 or 11 characterized in that the dip tube (12, 112) is of circular section, said cutout (200) extending over an angular opening of between 150 and 220, and preferably, close to 180. 13. - Device (1, 101) according to any one of claims 10 to 12 characterized in that the end edge (201) extends in a plane substantially perpendicular to the axis (X) of the dip tube ( 12, 112). 14. - Device (1, 101) according to any one of claims 10 to 12 characterized in that the end edge (201) extends in an oblique plane relative to the axis (X) of the dip tube . 15. - Device (1, 101) according to any one of claims 1 to 9 characterized in that an end edge (201) of the tube is cut in an oblique plane relative to the axis (X) of the plunger tube, said cut end edge (201) having a distal portion (207), and a proximal portion (208) opposite the distal portion (207), a retaining region (20) of the sealing (14,114) within the plunger tube (12,112) being obtained by deformation / bending of the distal portion (207) of said end edge (201) within the plunger tube (12). , 112) in the direction of the dispensing member (5, 105). 16. - Device (1, 101) according to claim 15 characterized in that the distal portion (207) of said end edge (201) is deformed / folded around a folding zone located at an intermediate axial height between said distal (207) and proximal (208) portions of the end edge (201). 17. - Device (1, 101) according to any one of claims 1 to 9 characterized in that an end edge (201) of the tube is cut in an oblique plane relative to the axis (X) of the plunger tube, said cut end edge (201) having a distal portion (207), and a proximal portion (208) opposite the distal portion (207), a cutout (209) extending longitudinally from the portion distal portion (207) of the end edge (201) into which it opens, a retaining region (20) of the closure member (14, 114) inside the plunger tube (12, 112) being obtained by deformation / folding inside the plunger tube (12, 112), in the direction of the dispensing member (5, 105), a portion (210) of the end edge (201) of a side of said cutout (209). 18. - Device (1, 101) according to claim 17 characterized in that said cutout (209) extends to an end located at an axial intermediate level between said distal portions (207) and proximal (208) of the edge end portion (201), said end edge portion (210) being deformed / folded about a folding zone in the vicinity of said end of the blank. 19. - Method for ensuring the retention of a closure element (14, 114), in particular in the form of a ball, inside a dip tube (12, 112) fitted to a device (1, 101 ) for packaging and dispensing under pressure a product (P), said method of deforming / folding said dip tube (12, 112), possibly after making at least one adequate cut, so as to form at least a retaining zone (20, 21) of the closure element (14, 114) inside the plunger tube (12, 112). 20. - A method according to claim 19 characterized in that it comprises a) realize in a free end (13, 113) of the plunger tube (12, 112) a cutout (200) extending transversely to an axis (X ) of the dip tube, said cutout (200) being formed away from an end edge (201) of the dip tube; and b) deforming / bending radially inwardly of the dip tube, the portion (202) of the dip tube located between the cutout (200) and the end edge (201), so as to form a holding zone (20). ) of the shutter element inside the dip tube. 21. - The method of claim 19 characterized in that it consists in a) realize in a free end (13, 113) of the plunger tube a cutout (200) extending transversely to an axis (X) of the plunger tube, said cutout (200) being formed remote from an end edge (201) of the dip tube; b) longitudinally cutting the strip formed between said cutout (200) and said end edge (201), substantially in the middle, over the entire axial height of the strip so as to form two strip portions (203, 204); and c) deforming / bending the free ends (205, 206) of said web portions inwardly of the dip tube so as to form two retention zones (20, 21) of said closure member inside the dip tube. . 22. - Method according to claim 20 or 21 characterized in that the dip tube is of circular section, said cutout (200) made in step a) extending over an angular aperture of between 150 and 220, and preferably, close to 180. 23. - Method according to claim 19 characterized in that it consists in a) cutting an end edge (201) of the tube in an oblique plane relative to the axis of the plunger tube, said end edge (201 ) thus cut having a distal portion (207), and a proximal portion (208), opposite to the distal portion; and b) deforming / bending the distal portion (207) of said end edge (201) within the plunger tube toward the dispensing member. 24. - The method of claim 23 characterized in that the distal portion (207) of said end edge is deformed / folded around a folding zone located at an axial height intermediate between said distal portions (207) and proximal ( 208) of the end edge (201). 25. - Method according to claim 19 characterized in that it consists in a) cutting an end edge (201) of the tube in an oblique plane relative to the axis (X) of the dip tube, said edge of cut end (201) having a distal portion (207), and a proximal portion (208) opposite to the distal portion; b) providing a longitudinal cut (209) extending from the distal portion (207) of the end edge (207) into which it opens; and c) deforming / folding a portion (210) of the end edge (201) located on one side of said cutout (209) within the plunger tube, towards the dispenser member. 26. - Method according to claim 25 characterized in that said cutout (209) made during step b) extends to an end located at an axial intermediate level between said distal portions (207) and proximal (208). ) of the end edge (201), said end edge portion (210) being deformed / folded around a folding zone in the vicinity of said end of the blank (209). 27. - Method according to any one of claims 19 to 26 characterized in that the (or) zone (s) retaining (20, 21) is (are) welded (s) after "deformation / folding" of the tube diver.