FR3139556A1 - Cosmetic product packaging assembly comprising a container made of cellulosic material and a sealing element - Google Patents

Abstract

Cosmetic product packaging assembly comprising a container made of cellulosic material and a closing element The invention relates to a cosmetic product packaging assembly comprising a container made of cellulosic material extending along a longitudinal axis (X) and a sealing element shutter (3), in which the shutter element (3) is provided with a sealing element (4) having a radially inner sealing skirt and a radially outer sealing skirt together defining a groove, and in which, when the closing element (3) closes the container, the neck (21) of the container is partially received in the groove of the sealing element (4) and defines therewith a zone of radially interior interference zone, a radially exterior interference zone and a frontal interference zone, said interior and exterior interference zones having at least partial overlap in projection on the longitudinal axis (X). Figure for abstract: Fig. 4

Description

Cosmetic product packaging assembly comprising a container made of cellulosic material and a sealing element

The present invention relates to the field of cosmetic product packaging assemblies comprising a container, in particular a bottle or a pot, and a sealing element.

A cosmetic product is in particular a product as defined in Regulation 20 EC No. 1223/2009 of the European Parliament and of the Council dated November 30, 2009, relating to cosmetic products.

More specifically, the invention relates to a cosmetic product packaging assembly comprising a container and a closing element adapted to seal the container in a storage configuration and clear an opening of the container and allow the distribution of the cosmetic product contained in it. its breast in distribution configuration.

Conventionally, the container extends along a longitudinal axis between a bottom and a neck, a peripheral wall connecting said bottom to said neck. The neck defines an opening through which the cosmetic product can be dispensed and has a radially inner surface and a radially outer surface, connected by a front surface, also referred to as drinking from the neck, extending in the radial direction. The radially outer surface of the neck of the container is provided with an axial assembly portion. The radially interior and exterior surfaces each have a smooth axial portion connected to the front surface. By “smooth axial portion”, we must here understand an axial portion extending parallel to the longitudinal axis and devoid of any relief, projecting or recessed.

Still conventionally, the closing element comprises a plate intended to extend orthogonal to the longitudinal axis of the container when the closing element closes the container and having an upper surface and a lower surface. The plate of the shutter element also has a fixing skirt extending perpendicularly from the lower surface to a front surface and comprising a radially interior surface and a radially exterior surface connected by the front surface. The radially interior surface of the fixing skirt of the closing element is provided with an axial assembly portion adapted to cooperate with the axial assembly portion of the radially exterior surface of the neck of the container.

Cosmetic product containers as defined above can as standard be made of plastic. However, in order to reduce the environmental impact of its activity, whether during the manufacture of packaging assemblies or at the end of their life, in particular to encourage recycling, the cosmetics industry tends to substitute, to replace the plastic materials used to manufacture the components of packaging sets with materials with a reduced environmental impact. Thus, cosmetic product containers have been developed as defined above, in which at least the neck, and preferably the majority, or even the entirety of the container, comprises a cellulosic material.

These cellulosic materials used to make at least part of the container include for example paper or cardboard fiber or paper or cardboard pulp, the use of these materials having the advantage of reducing the use of materials first from the petrochemical sector and to improve the recyclability and/or degradability of the container, these materials can also advantageously come from recycling sectors.

However, the use of such cellulosic materials to make all or part of the container, and in particular its neck, is likely to cause certain problems, particularly in terms of sealing over time of an assembly using such container associated with a closing element.

Indeed, it was observed that the geometry of the neck of such containers, and in particular of the cross section of the neck, was likely to creep and vary over time upon contact with ambient humidity and/or water. contained in the cosmetic product received within the container. Thus, with such containers, it has for example been observed that a neck, originally of circular cross section, had a tendency to deform, and in particular to become oval or to present undulations over time, contact with a source of humidity.

Furthermore, it was also observed that the thickness of the wall of the neck of such a container, initially constant in the circumferential direction, tended to exhibit a certain variability over time, when exposed to a source of humidity. .

Such fluctuations over time in the geometry of the container, and in particular its neck, modify the contact zones between the neck of the container and the closing element with which it is associated in the closing configuration of the container, and risk to cause sealing defects in the packaging assembly when the closing element closes the container.

Conventionally, on a sealing element intended to seal a container it is known to provide a radially interior sealing skirt, extending from the lower surface of the sealing element and intended to be inserted inside of the neck and come into contact with its radially interior surface to ensure the sealing of the assembly in the container closure configuration. However, such a closure element structure is not capable of guaranteeing the maintenance over time of the tightness of the packaging assembly in the configuration of closure of the container by the closure element, when at least the neck of the container comprises a cellulosic material.

There is therefore a need to propose a cosmetic product packaging assembly comprising a sealing element and a container of which at least the neck comprises a cellulosic material, the seal of which is maintained over time in the sealing configuration of the container. by the shutter element is improved.

For this purpose, the present invention proposes a cosmetic product packaging assembly of the aforementioned type, in which at least the neck of the container, and preferably the major part, or even the entirety of the container, comprises a cellulosic material,
and characterized in that the lower surface of the sealing element is provided with a sealing element comprising a base having an upper surface and a lower surface, a radially inner sealing skirt and a radially inner sealing skirt exterior, said base and said sealing skirts defining a groove,
and in that, when the closing element closes the container, the smooth axial portions and the front surface of the neck of the container are at least partially received in the groove of the sealing element and define therewith a radially interior interference zone, a radially exterior interference zone and a frontal interference zone, said interior and exterior interference zones having at least partial overlap in projection on the longitudinal axis.

By “interference zone”, we must here understand a zone in which tightening occurs between two assembled elements, with deformation, preferably elastic, of at least one of these two elements.

Thanks to these arrangements, the invention proposes a cosmetic product packaging assembly whose maintenance of the seal over time in the container closure configuration by the closure element is improved.

Indeed, the implementation within the packaging assembly according to the invention of a sealing element provided with interior and exterior sealing skirts defining between them a receiving groove with tightening of the edge of the neck when the the closing element closes the container makes it possible to define on the closing element a portion for maintaining the geometry of the neck of the container, at least in the vicinity of the rim, guaranteeing a good seal between the neck of the container and the element shutter. Thus, even if the neck of the container is subject to geometric fluctuations over time, under the effect of the humidity to which it is exposed, during the closing of the container by the closing element equipped with a sealing element according to the invention, the radially inner and outer sealing skirts of the sealing element make it possible to guide and grip between them an end portion of the neck of the container, so that the latter finds a geometry adapted to ensure good sealing of the packaging assembly in the position of closing of the container by the closing element.

Furthermore, according to the invention, the groove defined on the sealing element fitted to the closing element, as well as the axial assembly portions provided on the neck of the container and on the fixing skirt of the element closure, are positioned and dimensioned so that, when the closure element closes the container, the front surface, or drinking surface, of the neck is held tightly against the bottom of the groove the sealing element equipping the shutter element.

Thus, thanks to the provisions of the invention, in the position of closing the container by the closing element, the sealing element defines with the neck of the container three sealed contact zones, formed by the interference zones , namely a continuous radially inner peripheral zone between the smooth axial portion of the inner surface of the neck of the container and the inner sealing skirt of the sealing element of the closing element, a continuous radially outer peripheral zone between the smooth axial portion of the outer surface of the neck of the container and the outer sealing skirt of the sealing element of the closing element and a continuous peripheral frontal zone between the front surface of the neck of the container and the bottom of the groove of the sealing element of the shutter element.

In the packaging assembly according to the invention, the at least partial overlap in projection on the longitudinal axis of the interior and exterior interference zones makes it possible to pinch the neck of the container in the vicinity of its front wall and thus ensure the maintaining tight contact between the smooth axial portions of the interior and exterior surfaces of the neck of the container and the sealing skirts of the sealing element when the sealing element closes the container, despite a possible variability over time of the geometry of the container neck.

For this purpose, the width of the groove of the sealing element measured perpendicular to the longitudinal axis is advantageously less than or equal to the thickness of the neck measured perpendicular to the longitudinal axis between the smooth axial portions connected by the surface frontal.

According to an advantageous arrangement, the overlap in projection on the longitudinal axis of the interior and exterior interference zones has an axial length greater than or equal to 0.5 mm, better still greater than or equal to 1 mm, even better greater than or equal to 2 mm. In particular, the overlap may have a length of between 2 mm and 5 mm, and in particular substantially equal to 2.5 mm.

Preferably, the axial assembly portion of the exterior surface of the neck and the axial assembly portion of the interior surface of the fixing skirt of the closing element are threaded portions. Thus, in this embodiment, the closing element is adapted to be fixed by screwing onto the neck of the container.

Alternatively, the axial assembly portion of the exterior surface of the neck and the axial assembly portion of the interior surface of the fixing skirt of the shutter element may have complementary elements forming a bayonet device, putting in particular implementing one or more pins provided on one of the neck of the container and the skirt for fixing the closing element and adapted to cooperate with one or more complementary grooves provided on the other of the neck of the container and the fixing skirt of the closing element and having (each) a component extending in the circumferential direction and a component extending in the axial direction, towards the bottom of the container or, where applicable, the front surface of the sealing element.

In the aforementioned embodiments, in which the placement of the sealing element on the container involves a relative rotational movement, the exterior surface of the neck of the container and the interior surface of the skirt for fixing the element shutter necessarily have a circular cross section. As a corollary, the smooth axial portions of the interior surface and the exterior surface connected by the front surface of the neck, are in the form of annular smooth axial portions, the groove defined by the interior and exterior sealing skirts of the sealing element is annular and the interior, exterior and front interference zones are also annular.

According to another variant, the axial portion for assembling the exterior surface of the neck and the axial portion for assembling the interior surface of the skirt for fixing the shutter element may have complementary snap-fastening means, putting for example implementing one or more levels of beads, continuous or discontinuous in the circumferential direction provided on one of the neck of the container and the fixing skirt of the closing element and adapted(s) to cooperate with one or more levels of beads, continuous or discontinuous in the circumferential direction, or one or more levels of continuous or discontinuous groove(s) in the circumferential direction and provided on the other of the neck of the container and the skirt for fixing the closing element.

In the aforementioned variant, the exterior surface of the neck of the container and the interior surface of the skirt for fixing the closing element do not necessarily have a circular cross section and can thus have a cross section of ovoid, polygonal shape, in particular with rounded corners, such as a square shape, or other.

Furthermore, independently of the shape of the cross section of its neck, the container, which may in particular constitute a bottle or a pot, may have a whole variety of cross section shapes, in particular a circular, ovoid, polygonal shape, in particular with rounded corners, such as a square shape, or other.

According to an advantageous arrangement, one and/or the other of the inner and outer sealing skirts of the sealing element has(are) a chamfer flaring towards the outside of the groove. Preferably, the inner and outer sealing skirts of the sealing element each have a chamfer flaring towards the outside of the groove, these chamfers extending facing each other.

Thanks to the implementation of a chamfer on one or the other, and preferably each of the interior and exterior sealing skirts of the sealing element, the insertion and guidance of the front surface and smooth axial portions of the container neck inside the groove of the sealing element are facilitated. Furthermore, this or these chamfers make it possible to achieve progressive tightening of the end part of the neck of the container carrying the front surface and the smooth axial portions by the sealing skirts of the sealing element during installation. position of the sealing element on the container until the sealing configuration.

In one embodiment, the base of the sealing element is in the form of a disc, the upper surface of which extends opposite the lower surface of the plate of the sealing element.

Alternatively, the base of the sealing element is in the form of a ring, in other words a disc hollowed out in its center, the upper surface of which extends facing the lower surface of the plate of the shutter element.

Advantageously, the sealing element is an element distinct from the shutter element, manufactured separately from the latter, and subsequently fixed on the shutter element, preferably in a removable manner.

The design in two distinct elements of the shutter element and the sealing element advantageously allows them to be produced using different manufacturing processes and/or in different materials. Furthermore, the fact of providing these two elements which can be dismantled from each other makes it possible to promote the separation of these elements at the end of their life from the assembly formed of the closing element and the sealing element. , in particular with a view to their recycling in dedicated sectors.

According to a particular arrangement of the invention, the sealing element is made of a first material and the sealing element is made of a second material, different from the first.

It will thus be possible to choose for the shutter element a first material, in particular a first plastic material, having the mechanical characteristics desired to ensure the functions of this element, and in particular the cooperation of its axial assembly portion with the axial portion of assembly of the neck of the container, and for the sealing element a second material, in particular a second plastic material, having the mechanical characteristics desired to ensure the functions of this element, and in particular a good seal between the sealing skirts and the front surface and smooth axial portions of the neck of the container, for example through increased deformability of the second material compared to that of the first material.

In one embodiment, the sealing element is attached to the sealing element by overmolding.

Alternatively or in addition, the sealing element is fixed to the sealing element by means of complementary fixing elements comprising for example complementary snap-on reliefs making it possible to ensure axial retention of the element sealing element on the sealing element, optionally combined with axial projections provided on either of the sealing element and the sealing element and adapted to be accommodated in axial grooves provided on the other of the closing element and the sealing element in order to ensure the rotational connection of these two elements.

In a variant embodiment of the invention, the shutter element and the sealing element come in a single piece, in other words they are in one piece and form only one mechanical part.

Preferably, the cellulosic material in which at least the neck, and preferably the majority, or even the entirety of the container is made comprises paper, cardboard, paper pulp, cardboard pulp or a mixture of these materials. The cellulosic material in which at least the neck, and preferably the majority, or even the entirety of the container is made may also include bamboo or a bamboo derivative or even bagasse, a fibrous residue from sugar cane, or a mixture of these materials.

In one embodiment, the sealing element is made of plastic, in particular polyethylene, polypropylene, polyethylene terephthalate (PET), elastomeric material, such as Styrene-Ethylene-Butylene-Styrene (SEBS), or a mixture of these materials.

In one embodiment, the closing element forms a cap for the container, and comprises a plate, in particular substantially planar, and continuous intended to selectively seal the container in a storage configuration and clear an opening of the container and allow the distribution of the cosmetic product contained within it in distribution configuration.

In alternative embodiments, the closing element also forms a distribution element for the product contained within the container, the assembly to which it belongs with the container then forming a cosmetic product packaging and distribution assembly.

In one of these embodiments, the plate of the closing element has at least one distribution orifice for the product contained within the container, the closing element further comprising a closing member adapted to selectively seal seal the dispensing orifice in storage configuration and clear the dispensing orifice and allow the distribution of the cosmetic product contained within the container in dispensing configuration.

Thus, the closing element could for example form a service capsule, conventionally comprising a base fixed on the neck of the container, having a skirt for fixing to the neck of the container and a plate provided with a distribution orifice, and associated with a cap, pivotally mounted on the base, in particular via a film hinge, between a closing position and a position for clearing the distribution orifice, the cap being further provided with a closing stud adapted to insert into the dispensing orifice in the closed position. In this case, the base of the sealing element is adapted to allow the distribution of the product contained in the container through the distribution orifice of the base of the service capsule; for this purpose, the base of the sealing element can for example have an annular shape centered on the longitudinal axis and carrying the inner and outer sealing skirts raised from the base or have a disc shape carrying the skirts of The interior and exterior sealing erected from the base and provided with a passage orifice located to the right of the distribution orifice.

Alternatively, the closing element may comprise a hoop for fixing a dispensing device to the neck of the container, the dispensing device may for example be formed of a pump, a cannula, a nozzle or the like. In this case, the plate of the closing element and the base of the sealing element each have a recess adapted to the passage and/or the watertight fixing of the distribution device, while respectively carrying the fixing skirt to the container and the interior and exterior sealing skirts.

According to yet another variant, the closing element comprises a fixing ring for an attached cap, the plate of the closing element and the base of the sealing element each having an access opening, communicating with the opening of the neck of the container, while respectively carrying the skirt for fixing to the container and the interior and exterior sealing skirts, and the closing element, in particular its plate, and the attached cap also having elements complementary assembly elements, preferably reversible, such as threaded portions, complementary elements forming a bayonet device, complementary snap-fastening elements or others.

The invention can be better understood on reading the description which follows, accompanied by non-limiting examples of its implementation, with reference to the appended drawings, in which:

represents in perspective a cosmetic product packaging assembly according to the invention;

illustrates the packaging assembly according to the invention in longitudinal section according to the section plane P of the ;

illustrates in longitudinal section a detail of the packaging assembly according to the invention during a phase of closing the container by the closing element;

illustrates in longitudinal section a detail of the packaging assembly according to the invention in the configuration of closing the container by the closing element;

illustrates in enlarged view detail D of the .

There illustrates in perspective a cosmetic product packaging assembly 1 according to the invention, said assembly 1 comprising a container 2, here in the form of a vial or a bottle, and a closing element 3.

Such a bottle 2 can for example contain in breast care a cosmetic product such as shampoo, shower gel, lotion or other.

Alternatively, the container 2 can be in the form of a pot, more particularly suitable for containing a cosmetic product such as cream, mousse or other.

As visible in Figures 1 and 2, the container 2 extends along a longitudinal axis

In the embodiment illustrated in the figures, the bottom 20 of the container 2 is substantially planar. Alternatively, the bottom 20 of the container may have a recess centered on the longitudinal axis X and extending towards the interior of the container 2.

Furthermore, in the embodiment illustrated in the figures, the peripheral wall 22 has a circular cross section. However, the container 2 may have a whole variety of cross-section shapes, in particular a circular, ovoid, polygonal shape, in particular with rounded corners, such as a square shape, or other, without departing from the scope of the present invention.

In the embodiment illustrated in the figures, the container 2 is in one piece and entirely made of a cellulosic material, possibly associated with a coating of another nature affixed to its interior surface and/or its exterior surface.

In particular, the cellulosic material comprises paper, cardboard, paper pulp, cardboard pulp or a mixture of these materials.

As visible in particular in Figures 2 to 4, the neck 21 of the container 2 defines an opening O for access to the interior volume of the container 2 and has a radially interior surface 23 and a radially exterior surface 24, connected to each other by means of a front surface 25, also designated drinking from the neck, extending in the radial direction, perpendicular to the longitudinal axis X.

As appears in particular in Figures 3 and 4, the exterior surface 24 of the neck 21 of the container 2 is provided with an axial assembly portion 26, here in the form of a threaded portion. Thus, in the illustrated embodiment, the exterior surface 24 of the neck 21 of the container 2 necessarily has a circular cross section.

Furthermore, the interior surface 23 and the exterior surface 24 of the neck 21 of the container 2 each have a smooth axial portion 27, 28, in other words devoid of projecting or recessed relief, located axially between the axial assembly portion, here the threaded portion 26, and the front surface 25.

In the illustrated embodiment, in which the assembly portion of the exterior surface 24 of the neck 21 is in the form of a threaded portion 26, the smooth axial portions 27, 28 of the interior 23 and exterior 24 surfaces of the neck 21 are in the form of smooth annular axial portions.

The assembly 1 according to the invention further comprises a closing element presented in the embodiment illustrated in the form of a cap 3 for the container 2, and comprises a plate 30, in particular substantially planar, and continuous provided to selectively seal the container 2 in a storage configuration and clear the opening O of the neck 21 of the container 2 and allow the distribution of the cosmetic product contained within it in the distribution configuration.

More specifically, and as visible in Figures 2 to 4, the cap 3 comprises a plate 30 intended to extend orthogonally to the longitudinal axis of the container 2 when the cap 3 closes the container 2 and having an upper surface 31 and a opposite lower surface 32.

The cap 3 further has a fixing skirt 33 to the neck 21 of the container 2. This fixing skirt 33 extends substantially perpendicular to the lower surface 32 of the plate 30 up to a front surface 36 and has a radially interior surface 34 and a radially outer surface 35, interconnected via the front surface 36.

The radially interior surface 34 of the fixing skirt 33 of the cap 3 is provided with an axial assembly portion 37 adapted to cooperate with the axial assembly portion 26 of the exterior surface 24 of the neck 21 of the container 2. In the illustrated embodiment, axial assembly portion 37 of the radially interior surface 34 of the fixing skirt 33 of the plug 3 is in the form of a threaded portion adapted to cooperate with the threaded portion provided on the exterior surface 24 of the neck 21 of the container 2. Thus, in this embodiment, the interior surface 34 of the fixing skirt 33 of the cap 3 has a circular cross section.

According to the invention, and as is clear in particular in Figures 2 to 5, the lower surface 32 of the plate 30 of the plug 3 is provided with a sealing element 4. The sealing element 4 comprises a base 40 having an upper surface 41 and an opposite lower surface 42, a radially inner sealing skirt 43 and a radially outer sealing skirt 44, said base 40 and said sealing skirts 43, 44 together defining a groove 45 adapted to receive with clamping at least one end portion of the neck 21 of the container 2.

More specifically, and as visible in particular in Figures 4 and 5, when the plug 3 closes the container 2, the smooth axial portions 27, 28 and the front surface 25 of the neck 21 of the container 2 are at least partially received in the groove 45 of the sealing element 4 and define therewith a radially interior interference zone ZII, a radially exterior interference zone ZIE and a frontal interference zone ZIF.

By “interference zone”, we must here understand a zone in which tightening occurs between two assembled elements, with deformation, preferably elastic, of at least one of these two elements. Thus, when the cap 3 closes the container 2, as illustrated in particular in Figures 4 and 5, tightening is carried out on the one hand between the smooth axial portions 27, 28 of the interior 23 and exterior 24 surfaces of the neck 21 of the container and the inner 43 and outer 44 sealing skirts of the sealing element 4, and on the other hand between the front surface 25 of the neck 21 of the container 2 and the lower surface 42 of the base 40 defining the bottom of the groove 45 of the sealing element 4.

For this purpose, and as visible on the , the width l of the groove 45 of the sealing element 4 measured perpendicular to the longitudinal axis smooth axial portions 27, 28 connected by the front surface 25.

Advantageously, and as also appears on the , the interior interference zones ZII and exterior ZIE have an overlap c at least partial in projection on the longitudinal axis X.

In the illustrated embodiment, the overlap c of the interior ZII and exterior ZIE interference zones is substantially total. More precisely, in the illustrated embodiment, the interior interference zones ZII and exterior ZIE have a substantially equal axial length and extend parallel in the same axial portion. Alternatively, it could be expected that the interior interference zones ZII and exterior ZIE have different axial lengths and/or are located in respective axial portions, within the limit where these two axial portions have an overlap, a non-zero overlap. in projection on the longitudinal axis

In the illustrated embodiment, the cap 3 being fixed by screwing onto the neck 21 of the container 2, the groove 45 defined by the inner 43 and outer 44 sealing skirts of the sealing element 4 is annular and the zones ZII interior, ZIE exterior and ZIF front interference are also annular.

According to an advantageous arrangement of the present invention, the overlap c in projection on the longitudinal axis better greater than or equal to 2 mm, in particular between 2 mm and 5 mm, and in particular substantially equal to 2.5 mm.

Furthermore, and as visible in particular in Figures 3 to 5, the inner 43 and outer 44 sealing skirts of the sealing element 4 each have a chamfer 46 flaring towards the outside of the groove 45. Thus, the sealing element 4 defines a groove 45 having two facing chamfers 46 and making it possible to promote the introduction and progressive tightening of the portion of the neck 21 of the container 3 received in the groove when the plug 3 closes the O opening of neck 21.

In the illustrated embodiment, the base 40 of the sealing element 4 is in the form of a substantially planar and continuous disc, the upper surface 41 of which extends facing the lower surface 32 of the plate 30 of cap 3.

Alternatively, it could be provided that the base 40 of the sealing element 4 is in the form of a ring, hollowed out in its center, the upper surface 41 of which extends facing the lower surface 32 of the plate 30 of cap 3.

Furthermore, in the illustrated embodiment, the sealing element 4 is in the form of an element separate from the plug 3 and attached to it.

Thus, in this embodiment, the sealing element 4 can be manufactured separately from the plug 3 and subsequently fixed thereto, preferably in a removable manner.

Alternatively, still in such an embodiment, the sealing element 4 is attached to the plug 3 by overmolding.

According to an advantageous arrangement of such an embodiment, the plug 3 is made of a first material and the sealing element 4 is made of a second material, different from the first.

Thus, the cap 3 could for example be made from a first material, in particular a first plastic material, such as Polyethylene (PE), Polypropylene (PP), Polyethylene Terephthalate (PET), an elastomeric material, such as Styrene -Ethylene-Butylene-Styrene (SEBS), or a mixture of these materials and the sealing element could for example be made of a second material, in particular a second plastic material, such as Polyethylene (PE), Polypropylene ( PP), Polyethylene Terephthalate (PET), an elastomeric material, such as Styrene-Ethylene-Butylene-Styrene (SEBS), or a mixture of these materials.

Thus, thanks to the provisions of the present invention, when the cap 3 is placed on the container 2 in order to close the opening O of its neck 21 by cooperation of the axial assembly portions 26, 37 provided on each of these elements, as illustrated in Figures 3 to 5, at least part of the smooth axial portions 27, 28, as well as the front surface 25 of the neck 21 are received inside the groove 45 defined by the sealing skirts inner 43 and outer 44 of the sealing element 4, and tightening is progressively carried out between these elements in the radially inner interference zones ZII and outer ZIE, as well as in the frontal interference zone ZIF when the plug 3 arrives at the end of the assembly stroke on the neck 21. As a result, the geometric integrity of the cross section of the neck 21 of the container is preserved over time and the seal between the cap 3 and the neck 21 of the container 2 is ensured when the cap 3 is in the configuration of closing the container 2.

Although in the present detailed description, the invention has been illustrated in relation to a cap 3 screwed onto the neck 21 of the container 3 and adapted to selectively close the container 3 and clear the opening O of its neck 21 with a view to the distribution of product contained within it, it is not limited to such a structure of cap 3, nor of means of assembly between this cap 3 and the neck 21 of the container 2.

Thus, the present invention also extends to a cap 3 having other means of assembly to the neck 21 of the container 2, such as snap-fastening means, formed for example of one or more levels of beads, continuous or discontinuous in the circumferential direction and intended to cooperate with complementary latching means provided on the neck 21 of the container 2, formed for example of one or more levels of beads, continuous or discontinuous in the circumferential direction, or of one or more several levels of continuous or discontinuous grooves in the circumferential direction.

In the same way, the invention also extends to a cap forming a service capsule, conventionally comprising a base fixed on the neck 21 of the container 2, having a fixing skirt 33 to the neck 21 of the container and a plate 30 provided with a dispensing orifice, and associated with a cap, pivotally mounted on the base, in particular via a film hinge, between a closed position and a position for releasing the dispensing orifice, the cap being further provided with a closing stud adapted to be inserted into the distribution orifice in the closing position. In this case, the base 40 of the sealing element 4 is adapted to authorize the distribution of the product contained in the container 2 through the distribution orifice of the base of the service capsule; for this purpose, the base 40 can for example have an annular shape centered on the longitudinal axis and carrying the inner 43 and outer 44 sealing skirts raised from the base 40 or have a disc shape carrying the inner sealing skirts 43 and exterior 44 raised from the base 40 and provided with a passage orifice located to the right of the distribution orifice.

Claims (10)

Cosmetic product packaging set (1) comprising:
- a container (2) extending along a longitudinal axis (X) between a bottom (20) and a neck (21), a peripheral wall (22) connecting said bottom to said neck, said neck (21) defining an opening ( O) and having a radially interior surface (23) and a radially exterior surface (24) connected by a front surface (25) extending in the radial direction, said exterior surface (24) being provided with an axial portion of assembly (26), and said interior surface (23) and said exterior surface (24) each having a smooth axial portion (27, 28) connected to the front surface (25);
- a closing element (3) comprising a plate (30) intended to extend orthogonally to the longitudinal axis (X) when the closing element (3) closes the container (2) and having an upper surface (31) and a lower surface (32), and a fixing skirt (33) extending perpendicularly from the lower surface (32) of the plate (30) to a front surface (36), said fixing skirt ( 31) comprising a radially interior surface (34) and a radially exterior surface (35) connected by the front surface (36), said interior surface (34) being provided with an axial assembly portion (37) adapted to cooperate with the axial assembly portion (26) of the exterior surface (24) of the neck (21) of the container (2);
in which at least the neck (21) of the container (2), and preferably the major part, or even the entirety of the container (2), comprises a cellulosic material;
characterized in that the lower surface (32) of the sealing element (3) is provided with a sealing element (4) comprising a base (40) having an upper surface (41) and a lower surface ( 42), a radially inner sealing skirt (43) and a radially outer sealing skirt (44), said base (40) and said sealing skirts (43, 44) defining a groove (45),
and in that, when the closing element (3) closes the container (2), the smooth axial portions (27, 28) and the front surface (25) of the neck (21) of the container (2) are at less partially received in the groove (45) of the sealing element (4) and define therewith a radially interior interference zone (ZII), a radially exterior interference zone (ZIE) and a zone d frontal interference (ZIF), said interior (ZII) and exterior (ZIE) interference zones having an at least partial overlap (c) in projection on the longitudinal axis (X). Assembly according to claim 1, in which the overlap (c) in projection on the longitudinal axis (X) of the interior (ZII) and exterior (ZIE) interference zones has an axial length greater than or equal to 0.5 mm, preferably greater than or equal to 1mm, even better greater than or equal to 2mm, in particular between 2mm and 5mm, and in particular substantially equal to 2.5mm. Assembly (1) according to any one of claims 1 and 2, in which the axial assembly portion (26) of the exterior surface (24) of the neck (21) of the container (2) and the axial assembly portion (37) of the interior surface (34) of the fixing skirt (31) of the shutter element (3) are threaded portions. Assembly (1) according to any one of claims 1 to 3, in which one and/or the other of the inner (43) and outer (44) sealing skirts of the sealing element (4) present(s) a chamfer (46) flaring towards the outside of the groove (45). Assembly (1) according to any one of claims 1 to 4, in which the base (40) of the sealing element (4) is in the form of a disc or a ring, the surface of which upper surface (41) extends opposite the lower surface (32) of the plate (30) of the shutter element (3). Assembly according to any one of claims 1 to 5, in which the sealing element (4) is manufactured separately from the closing element (3) and subsequently fixed thereto, preferably in a removable manner. Assembly according to any one of claims 1 to 6, in which the closing element (3) is made of a first material and the sealing element (4) is made of a second material, different from the first. Assembly according to any one of claims 1 to 7, in which the sealing element (4) is attached to the closing element (3) by overmolding. Assembly according to any one of claims 1 to 8, in which the cellulosic material in which at least the neck (21) of the container (2) is made comprises paper, cardboard, paper pulp, paper pulp. cardboard, bamboo or a bamboo derivative or bagasse, a fibrous residue from sugar cane, or a mixture of these materials. Assembly according to any one of Claims 1 to 9, in which the sealing element (4) is made of plastic material, in particular Polyethylene (PE), Polypropylene (PP), Polyethylene Terephthalate (PET), elastomeric material, such as Styrene-Ethylene-Butylene-Styrene (SEBS), or a mixture of these materials.