A cosmetic product packaging assembly comprising a bottle at least partly made of cellulose material and a sealing device

Abstract

TITLE Cosmetic product packaging assembly comprising a bottle at least partly made of cellulosic material and a sealing element The invention relates to a cosmetic product packaging assembly, comprising: - a bottle comprising at least one neck (21) made of cellulosic material, having a front face (25) defining an opening (O) and comprising an inner surface (23) and an outer surface (24) provided with a thread (26) extending into a threaded axial portion (PF);- a closure member comprising a plate (30), a fixing skirt (31) having an internal thread (34) adapted to cooperate with the external thread (26) in the bottle closure position (2), and a stiffening skirt (35) having an inner surface (36) and an outer surface (37), wherein, in the bottle closure position (2), the neck (21) is clamped between the fixing skirt (31) and the stiffening skirt (35) of the closure member (3), the outer surface (37) of the stiffening skirt (35) extending opposite the inner surface (23) of the neck (21) at least in the axial portion (PF) in which the external thread (26) extends. Figure for the abbreviation: Fig. 3;

Description

Title of the invention: Cosmetic product packaging assembly comprising a bottle at least partly made of cellulose material and a sealing device

[0001] The present invention relates to the field of cosmetic product packaging assemblies.

[0002] 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 30 November 2009 on cosmetic products.

[0003] More specifically, the present invention relates to a cosmetic product packaging assembly comprising a bottle and a closure device adapted to hermetically seal the bottle in the sealing position and to uncover an opening in the bottle and allow the distribution of the cosmetic product contained within it in the distribution position.

[0004] Conventionally, a bottle belonging to such an assembly extends along a longitudinal axis between a base and a neck, with a peripheral wall connecting said base to said neck. The neck has a front face, also referred to as the neck opening, defining 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 wall. The radially outer surface of the bottle neck is also provided with an axial assembly portion, for example, in the form of an external thread.

[0005] In a known manner, a closure element belonging to such an assembly comprises a plate intended to extend orthogonally to the longitudinal axis of the bottle when the closure element closes the bottle and having a retaining skirt extending from the plate and comprising a radially inner surface and a radially outer surface. The radially inner surface of the retaining skirt of the closure element is provided with an axial assembly portion, in the form, for example, of an internal thread, adapted to cooperate with the axial assembly portion of the radially outer surface of the bottle neck.

[0006] Cosmetic product bottles as defined above are classically made of plastic material.

[0007] The proposal of eco-responsible, environmentally friendly solutions whose design and development take into account environmental issues is becoming a major concern in order to help meet global challenges.

[0008] It is therefore essential to design products that reduce the amount of materials used and / or replace them with more environmentally friendly materials and / or use recyclable materials in order to reduce the carbon footprint of the product.

[0009] In this context, it becomes important to replace certain materials with alternatives that have a better environmental footprint, in particular by reducing the use of raw materials from petrochemicals.

[0010] The objective is to offer eco-responsible materials, in particular those derived from green chemistry, in order to limit the environmental impact of packaging from its manufacture to its end of life, in particular through materials with a good biodegradability profile and / or from renewable sources.

[0011] In this context, with a view to reducing the environmental impact of its activity, whether during the manufacture of packaging assemblies or at their end of life, particularly to promote recycling, the cosmetics industry tends to substitute or replace the plastics used to manufacture the components of packaging assemblies with materials having a reduced environmental impact. Thus, cosmetic product bottles, as defined above, have been developed in which at least the neck, and preferably most, or even all, of the bottle comprises a cellulose material.

[0012] These cellulosic materials used to make at least part of the bottle 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 raw materials from the petrochemical sector and improving the recyclability and / or degradability of the bottle, these materials can also advantageously come from recycling channels.

[0013] For example, in this field we know of document CN115341415A, which describes the manufacture of a bottle made entirely of cellulosic material, adapted to be sealed by a sealing device as defined above, also made of cellulosic material.

[0014] However, the use of such cellulosic materials to make all or part of the bottle, and in particular its neck, is likely to cause certain specific problems, which do not occur or are much less present when the bottle is made of plastic, in particular in terms of geometric stability and reliability over time of the sealing of an assembly using such a bottle associated with a closure device.

[0015] Indeed, it has been observed that the geometry of the neck of such bottles, and in particular the cross-section of the neck, is susceptible to flow, to vary over time in contact with ambient humidity and / or the water contained in the cosmetic product received at within the bottle. Thus, with such bottles, it has been observed, for example, that a neck, originally of circular cross-section, tended to deform, and in particular to become oval or to exhibit undulations over time, in contact with a source of moisture.

[0016] Furthermore, it has also been observed that the wall thickness of the neck of such a bottle made of cellulosic material, initially constant in the circumferential direction, tended to exhibit some variability over time when exposed to a source of humidity.

[0017] Finally, it was further observed that the neck of such a bottle made of cellulosic material was subject to axial and / or radial conformation phenomena following repeated associations with the closure device, generating fluctuations in its geometry.

[0018] Such fluctuations over time in the geometry of the bottle, and in particular of its neck, modify the contact areas between the neck of the bottle and the closure member to which it is associated in the bottle closure position, and may cause leaks in the packaging assembly when the closure member closes the bottle, as well as difficulties in placing the closure member on the bottle.

[0019] Conventionally, a closure device intended to seal a bottle is known to have a radially internal sealing skirt extending from the closure device's platform and designed to fit inside the neck and make contact with its radially internal surface to ensure the seal of the assembly when the bottle is closed. However, such a closure device structure is not capable of guaranteeing the long-term maintenance of the seal of the packaging assembly when the bottle is closed by the closure element, at least when the bottle neck is made of a cellulose material.

[0020] Moreover, a bottle and more particularly a bottle neck made of cellulosic material has, at comparable dimensions, an intrinsically lower rigidity, particularly in torsion around the longitudinal axis, than that of a bottle neck made of plastic material, and is likely to decrease even further when the neck is exposed to ambient humidity and / or water contained in the cosmetic product received in the bottle.

[0021] Thus, when the closure device is conventionally screwed onto the neck of the bottle, by cooperation of the external thread of the neck of the bottle with the internal thread of the fixing skirt of the closure device, whether during factory assembly of these elements, after filling the bottle with cosmetic product, or during successive operations of closure of the bottle by the closure device carried out by the user during the life cycle of the packaging assembly, There is a risk that the neck of the bottle may deform and in particular twist around the longitudinal axis of the bottle, such deformation being likely to cause leaks of the bottle in the sealing position by the sealing device, or even a difficulty and ultimately an impossibility of screwing the sealing device onto the neck of the bottle if the deformation of the neck is too significant.

[0022] There is therefore a need to propose a cosmetic product packaging assembly comprising a sealing element and a bottle whose neck at least comprises a cellulosic material, in which the geometry of the neck is preserved over time, with the aim of maintaining the seal in the bottle closure position by the sealing element and the proper functioning of the screw assembly between the sealing element and the neck of the bottle.

[0023] The present invention aims to meet these objectives and, to this end, proposes a cosmetic product packaging assembly, comprising: - a bottle extending along a longitudinal axis and comprising a base, a neck and a side wall connecting said base to said neck, said neck having a front face, also referred to as drinking from the neck of the bottle, defining an opening and comprising a radially inner surface and a radially outer surface connected by a front wall, said radially outer surface being provided with an external thread extending into a threaded axial portion; - a bottle closure device comprising a plate adapted to close the opening in the bottle closure position and a radially external fixing skirt, extending from the plate and having a radially internal surface and a radially external surface, said radially internal surface being provided with an internal thread adapted to cooperate with the external thread in the bottle closure position, in which at least the neck of the bottle, and preferably the entire bottle, comprises a cellulose material, in which the obturator further comprises a radially internal stiffening skirt, erected from the plate and having a radially internal surface and a radially external surface, and in which, in the bottle closure position, the neck is radially clamped, or in other words bordered on both sides in the radial direction, between the fixing skirt and the stiffening skirt of the closure member, the radially external surface of the stiffening skirt extending opposite, and preferably in contact with, the radially internal surface of the neck at least in the axial portion in which the external thread extends.

[0024] In other words, in the overall design according to the invention, the external thread of the bottle neck extends over a given axial portion and, in the bottle closure position, the radially outer surface of the stiffening skirt of the obturator extends opposite, or even in contact with, the inner surface of the neck at least in this given axial portion.

[0025] For the sake of clarity, it is recalled here that the longitudinal axis of the bottle defines in particular an axial direction extending along or parallel to the longitudinal axis and a radial direction, orthogonal to the axial direction.

[0026] Furthermore, it is specified here that, in the remainder of the application, when the expression "at the level of" an item is indicated, whether it is a surface, a face, a geometric characteristic of an element or other, and in particular with regard to the opening of the bottle, is to be understood as being located at an axial position corresponding substantially to that of said item.

[0027] Thanks to these provisions, the invention proposes a cosmetic product packaging assembly in which the maintenance over time of the seal in the bottle closure position by the closure element is improved and in which the functionality of the screw assembly of the closure element on the neck of the bottle is preserved, despite the use of cellulosic material for the production of the neck of the bottle and the potential geometric variations undergone in the presence of humidity.

[0028] Indeed, in the cosmetic product packaging assembly according to the invention, the external thread of the bottle neck extends over a given axial portion. The stiffening skirt of the closure element is positioned opposite, and preferably in contact with, via its radially external surface, the axial portion in which the external thread of the neck extends, at least, so that the neck is clamped, or in other words sandwiched, at least in this axial portion, between the fixing skirt and the stiffening skirt. In this way, the geometry of the bottle neck can be maintained over time by its interaction with the closure element, and the sealing of the bottle in the closed position by the closure element is thus made more reliable.

[0029] Furthermore, thanks to the provisions of the invention, the phenomenon of torsion of the neck of the bottle is limited when the closure member is screwed onto it, by reinforcing the interaction between the neck of the bottle and the closure member, at least in the axial portion of the neck in which the external thread of the neck extends, by cooperation with the stiffening skirt of the closure member, thus forming a buttress of the neck, at least in its threaded portion.

[0030] Advantageously, in the bottle closure position, the neck is radially clamped between the fixing skirt and the stiffening skirt of the closure member, the radially outer surface of the stiffening skirt extending opposite, preferably in contact with, the radially inner surface of the neck from the opening and over the entire axial portion in which the external thread extends.

[0031] When the stiffening skirt is designed and dimensioned so that, in the bottle closure position, its radially outer surface is in contact with the radially inner surface of the neck, at least in the axial portion in which the external thread extends, the radial distance separating the radially outer surface of the stiffening skirt and the radially inner surface of the neck in this axial portion is close to zero, or even negative, implying in the latter case an insertion with clamping of the stiffening skirt in the neck and a tight assembly at the interface between these two elements located between the radially outer surface of the stiffening skirt and the radially inner surface of the neck, in the axial portion in which the external thread of the neck extends, at least.

[0032] When the stiffening skirt is designed and dimensioned so that, in the bottle closure position, its radially outer surface is aligned with the radially inner surface of the neck, at least in the axial portion in which the external thread extends, the radial distance separating the radially outer surface of the stiffening skirt and the radially inner surface of the neck in this axial portion is preferably less than 2 mm, better still less than 1 mm, and for example, on the order of 0.5 mm. The clearance in the radial direction thus provided at this interface makes it possible, in particular, to limit the radial deformation of the bottle neck following repeated contact with the closure device.

[0033] In a particular embodiment, the external thread of the neck extends over an axial portion in which the neck has a first thickness, the stiffening skirt of the closure member has, at least in the area opposite or in contact with the radially internal surface of the neck in the bottle closure position, a second thickness, and the second thickness is greater than or equal to the first thickness, in particular greater than or equal to 1.5 times the first thickness, and in particular close to 2 times the first thickness.

[0034] Thus, in this particular embodiment, in the bottle closure position, the neck of the bottle is stiffened, in particular in the radial direction, at least in the axial portion in which the external thread extends, by means of a stiffening skirt of the closure member with a thickness greater than that of the neck in this axial portion.Such provisions are particularly advantageous in the case where the sealing element also includes a cellulosic material, as will be introduced later; indeed, in such a case, the stiffening skirt is also subject to variations in geometry over time and oversizing its thickness relative to that of the neck in the axial portion of the external thread makes it possible to minimize these geometric variations and to ensure that the stiffening skirt fulfills the functions of maintaining the geometry of the neck and limiting the torsional deformation of the neck when the sealing element is screwed onto it.

[0035] Alternatively or in addition, the radially inner surface of the neck is provided with an internal thread, extending in particular opposite the external thread formed on the radially outer surface of the neck, and the radially outer surface of the stiffening skirt of the closure member is provided with an external thread adapted to cooperate with the internal thread of the neck in the bottle closure position.

[0036] In this embodiment, the internal thread of the neck preferably extends in correspondence with the external thread, in the same axial portion, recessed on the radially inner surface of the neck. Such an internal thread on the neck may, for example, result from the manufacturing process of the bottle and the formation of the external thread of the neck, as described, for example, in the aforementioned document CN115341415A.

[0037] Thanks to these arrangements, when the bottle is sealed by the sealing device, the neck is clamped between the internal thread of the retaining skirt and the external thread of the stiffening skirt, in the axial portion where the external thread and, where applicable, the internal thread extend, by the interaction of the internal thread of the retaining skirt with the external thread of the neck and of the external thread of the stiffening skirt with the internal thread of the neck, respectively. This further improves the long-term stability of the neck's geometry and minimizes the risk of torsional deformation of the neck when the sealing device is screwed onto it.

[0038] According to an advantageous arrangement, in the bottle closure position, the front face of the neck is in contact with the tray of the closure device, preferably by means of a seal, in particular a flat one, fixed on the tray of the closure device in an annular space defined between the fixing skirt and the stiffening skirt or on the front face of the neck.

[0039] The support of the front face of the neck of the bottle against the plate of the obturation device in the obturation position further strengthens the maintenance of the geometry of the neck over time and reduces the risk of torsional deformation of the neck when the obturation device is screwed onto it.

[0040] Furthermore, the interposition of a seal between the front face of the bottle neck and the plate of the closure device ensures the sealing of the packaging assembly in the bottle closure position, the seal being advantageously compressed in the axial direction between the front face of the bottle neck and the plate of the closure device in the bottle closure position.

[0041] The implementation of this seal in the annular space defined between the fixing skirt and the stiffening skirt also allows for reliable placement and retention of the sealing seal on the closure element and its good cooperation with the front face of the bottle neck to ensure the sealing of the packaging assembly in the bottle closure position.

[0042] Such a sealing gasket can advantageously be deposited in the annular space defined between the fixing skirt and the stiffening skirt of the obturator member by means of a cannula plunging between these skirts and having an end for distributing the material constituting the gasket placed opposite the internal surface of the plate.

[0043] Alternatively, or possibly in addition, the radially outer surface of the stiffening skirt or the radially inner surface of the fixing skirt has an annular groove partially housing an O-ring in tight contact with the radially inner surface of the neck, respectively with the radially outer surface of the neck, in the bottle closure position.

[0044] In such an embodiment, the sealing of the packaging assembly in the bottle closure position can advantageously be ensured by tightening in the radial direction of the O-ring interposed either between the radially outer surface of the stiffening skirt and the radially inner surface of the neck, or between the radially inner surface of the fixing skirt and the radially outer surface of the neck.

[0045] Such arrangements may be particularly advantageous so that, in the bottle closure position, the front face of the neck is not subjected to an axial force exerted by the closure device, which would be likely to alter its geometry.

[0046] In one embodiment, the neck of the bottle has, in the vicinity of the opening, a substantially straight tubular shape centered on the longitudinal axis, and the front face of the neck, or drinking neck, defining the opening of the bottle, is formed by the front wall of the neck connecting the radially inner surface and the radially outer surface and oriented opposite to the bottom of the bottle. Such a bottle neck structure offers an advantage in terms of manufacturing simplicity.

[0047] In this embodiment, advantageously, in the position of the bottle being closed by the closure device, the radially external surface of the neck is opposite, preferably in contact, the radially internal surface of the fixing skirt of the closure device and / or the radially internal surface of the neck is opposite, preferably in contact, the radially external surface of the stiffening skirt of the closure device, in particular at the neck opening.

[0048] When the fixing skirt is designed and dimensioned so that, in the bottle closure position, its radially inner surface is in contact with the radially outer surface of the neck, particularly at the opening, the radial distance separating the radially inner surface of the fixing skirt and the radially outer surface of the neck, particularly at the opening, is close to zero, or even negative, implying in the latter case a fixation with tightening of the fastening skirt on the collar and a tight assembly at the interface between these two elements located between the radially inner surface of the fastening skirt and the radially outer surface of the collar, in particular at the opening.

[0049] When the retaining skirt is designed and dimensioned so that, in the bottle's closure position, its radially inner surface is aligned with the radially outer surface of the neck, particularly at the opening, the radial distance separating the radially inner surface of the retaining skirt and the radially outer surface of the neck is preferably less than 2 mm, better still less than 1 mm, and for example, on the order of 0.5 mm, particularly at the opening. The clearance in the radial direction thus provided at this interface makes it possible, in particular, to limit radial deformation of the bottle neck following repeated contact with the closure device.

[0050] When the stiffening skirt is designed and dimensioned so that, in the bottle closure position, its radially outer surface is in contact with the radially inner surface of the neck, in particular at the opening, the radial distance separating the radially outer surface of the stiffening skirt and the radially inner surface of the neck, in particular at the opening, is close to zero, or even negative, implying in the latter case an insertion with clamping of the stiffening skirt in the neck and a tight assembly at the interface between these two elements located between the radially outer surface of the stiffening skirt and the radially inner surface of the neck, in particular at the opening.

[0051] When the stiffening skirt is designed and dimensioned so that, in the bottle closure position, its radially outer surface is aligned with the radially inner surface of the neck, particularly at the opening, the radial distance separating the radially outer surface of the stiffening skirt and the radially inner surface of the neck is preferably less than 2 mm, better less than 1 mm, and for example, on the order of 0.5 mm, particularly at the opening. The clearance in the radial direction thus provided at this interface makes it possible, in particular, to limit radial deformation of the bottle neck following repeated contact with the closure device.

[0052] In the case where, in the bottle's closure position, the radially outer surface of the neck is aligned, preferably in contact, with the radially inner surface of the closure device's retaining skirt, and the radially inner surface of the neck is aligned, preferably in contact, with the radially outer surface of the closure device's stiffening skirt, particularly at the opening, the neck is clamped, or in other words, held in sandwich, in the radial direction between the fixing skirt and the stiffening skirt of the obturator element, particularly at the opening, so that the maintenance of the neck geometry over time is further reinforced.

[0053] In an alternative embodiment, the front wall of the neck is folded outwards in the radial direction and towards the bottom in the axial direction, so that the neck has a folded portion of longitudinal section in the shape of an inverted U having a base defining the front face of the neck, a radially inner wing and a radially outer wing, said wings extending axially on either side of the base.

[0054] Thus, in this alternative embodiment, the front face of the neck, or drinking neck, defining the opening of the bottle, is formed by the base of the folded-down portion of inverted U-shaped longitudinal section of the neck.

[0055] By "folded-down portion of the neck with an inverted U-shaped longitudinal cross-section," it should be understood that, during the manufacture of the bottle, the front wall of the neck, connecting the radially inner surface and the radially outer surface, and initially oriented away from the bottom of the bottle, was folded down, or in other words, bent, curved, or specifically designed to be folded down, outwards in the radial direction and towards the bottom in the axial direction, so that the neck has, at its opening, a longitudinal cross-section—that is, a cross-section through any plane containing the longitudinal axis—in the shape of an inverted U. The folded-down portion of the neck thus has, in volume, a general shape of an annular gutter, or a torus centered on the longitudinal axis, the cross-section of which through any plane containing the longitudinal axis has the shape of an inverted U.In the remainder of this application, and for the sake of clarity and conciseness, the folded-over portion of the inverted U-shaped longitudinal section of the neck may be referred to as the "inverted U-shaped folded-over portion of the neck" or simply the "folded-over portion of the neck". Furthermore, the radially inner flange of the folded-over portion of the neck has a radially inner surface that is preferably located in the axial extension of the radially inner surface of the neck.

[0056] Thanks to the provisions of this alternative embodiment, the intrinsic rigidity of the bottle neck is reinforced at the opening, the neck having at the opening a double wall thickness formed by the radially inner and radially outer wings of the folded-over portion of the neck, connected by the base of the folded-over portion of the neck extending substantially in the radial direction. Thus, the maintenance of the neck's geometry over time is further improved and the risk of torsional deformation of the neck when the closure device is screwed onto it is further reduced. Moreover, in this alternative embodiment, when the bottle is in the closure position, the front face of the neck, defined by the base of the folded-over portion of the neck, is in contact with the plate of the closure device via a seal. or not, the inverted U-shaped structure in the longitudinal section of the folded-down portion of the neck offers increased stability of the neck subjected to an axial force exerted by the obturator plate.

[0057] Preferably, in this alternative embodiment, in the position of the bottle being closed by the closure device, the radially outer wing of the folded-down portion of the neck is facing, preferably in contact, the radially inner surface of the fixing skirt of the closure device and / or the radially inner wing of the folded-down portion of the neck is facing, preferably in contact, the radially outer surface of the stiffening skirt of the closure device, in particular at the opening.

[0058] The placement of the radially outer wing of the folded-down portion of the neck opposite and preferably in contact with the radially inner surface of the fixing skirt of the closure member and / or the placement of the radially inner wing of the folded-down portion of the neck opposite and preferably in contact with the radially outer surface of the stiffening skirt of the closure member in the bottle closure position, in particular at the opening, advantageously allows for further improvement in maintaining the geometry of the neck over time.

[0059] When the fixing skirt is designed and dimensioned so that, in the bottle closure position, its radially inner surface is in contact with the radially outer wing of the folded-down portion of the neck, in particular at the opening, the radial distance separating the radially inner surface of the fixing skirt and the radially outer surface of the radially outer wing of the folded-down portion of the neck, in particular at the opening, is close to zero, or even negative, implying in the latter case a fixing with clamping of the fixing skirt on the neck and a tight assembly at the interface between these two elements located between the radially inner surface of the fixing skirt and the radially outer surface of the radially outer wing of the folded-down portion of the neck, in particular at the opening.

[0060] When the retaining skirt is designed and dimensioned so that, in the bottle's closure position, its radially inner surface is aligned with the radially outer surface of the radially outer wing of the folded-down portion of the neck, particularly at the opening, the radial distance separating the radially inner surface of the retaining skirt and the radially outer surface of the radially outer wing of the folded-down portion of the neck is preferably less than 2 mm, better still less than 1 mm, and for example, on the order of 0.5 mm, particularly at the opening. The clearance in the radial direction thus provided at this interface makes it possible, in particular, to limit radial deformation of the bottle neck following repeated contact with the closure device.

[0061] When the stiffening skirt is designed and dimensioned so that, in position of bottle closure, its radially outer surface is in contact with the radially inner wing of the folded-down portion of the neck, in particular at the opening, the radial distance separating the radially outer surface of the stiffening skirt and the radially inner surface of the radially inner wing of the folded-down portion of the neck, in particular at the opening, is close to zero, or even negative, implying in the latter case an insertion with tightening of the stiffening skirt in the neck and a tight assembly at the interface between these two elements located between the radially outer surface of the stiffening skirt and the radially inner surface of the radially inner wing of the folded-down portion of the neck, in particular at the opening.

[0062] When the stiffening skirt is designed and dimensioned so that, in position The bottle's closure mechanism has its radially outer surface aligned with the radially inner surface of the inner flange of the folded-down portion of the neck, particularly at the opening. The radial distance between the radially outer surface of the stiffening skirt and the radially inner surface of the inner flange of the folded-down portion of the neck is preferably less than 2 mm, ideally less than 1 mm, and for example, on the order of 0.5 mm, especially at the opening. The clearance in the radial direction thus provided at this interface helps to limit radial deformation of the bottle neck resulting from repeated contact with the closure mechanism.

[0063] In the case where, in the bottle closure position, the radially outer wing of the folded-down portion of the neck is opposite, preferably in contact, the radially inner surface of the fixing skirt of the closure member and the radially inner wing of the folded-down portion of the neck is opposite, preferably in contact, the radially outer surface of the stiffening skirt of the closure member, in particular at the opening, the folded-down portion of the neck is sandwiched, or in other words sandwiched, in the radial direction between the fixing skirt and the stiffening skirt of the closure member, in particular at the opening, so that the maintenance of the geometry of the neck over time is further reinforced.

[0064] According to a first variant of this alternative embodiment, the radially inner and radially outer flanges of the folded-down portion of the neck are in contact with each other in the radial direction. The intrinsic rigidity of the neck is thus further reinforced at the opening, the neck having at the opening a double wall thickness formed by the radially inner and radially outer flanges of the folded-down portion of the neck, in contact with each other in the direction radial and connected by the base of the folded-down portion of the neck extending substantially in the radial direction.

[0065] According to a second variant of this alternative embodiment, the radially inner wing and the radially outer wing of the folded-down portion of the neck provide a space between them in the radial direction.

[0066] In this last variant of this alternative embodiment, an elastic element, in particular an element having an intrinsic elasticity greater than that of the material constituting the neck of the bottle, is advantageously arranged between the wings defined by the folded-down portion of the neck.

[0067] Thanks to these arrangements, a certain elasticity in the radial direction is conferred to the neck between the wings of the folded-down portion of the neck.

[0068] Advantageously, and in particular in the case where, in the bottle closure position, the radially outer wing of the folded-down portion of the neck is in contact with the radially inner surface of the fixing skirt of the closure member and the radially inner wing of the folded-down portion of the neck is in contact with the radially outer surface of the stiffening skirt of the closure member, the elastic member is compressed in the radial direction.

[0069] Thanks to these arrangements, it is ensured that, in the bottle's closed position, the radially outer wing of the folded-down portion of the neck is firmly pressed against the radially inner surface of the closure element's retaining skirt, and that the radially inner wing of the folded-down portion of the neck is firmly pressed against the radially outer surface of the closure element's stiffening skirt. The long-term stability of the neck's geometry is thus further improved.

[0070] According to an advantageous arrangement, the bottle is provided with a longitudinally cross-section seal in the shape of an inverted U overlapping the front face of the neck, having a base in contact with the front face of the neck, a radially inner wing and a radially outer wing, said wings extending axially on either side of the front face of the neck.

[0071] The term "joint with an inverted U-shaped longitudinal section" here refers to a joint that, in volume, has the general shape of an annular gutter or a torus centered on the longitudinal axis, the cross-section of which by any plane containing the longitudinal axis has the shape of an inverted U. For the sake of clarity and conciseness, this joint with an inverted U-shaped longitudinal section may be referred to as an "inverted U-shaped joint" in the remainder of this application.

[0072] Preferably, in the position of the bottle being closed by the closing device, the base of the inverted U-shaped seal is in contact with the tray.

[0073] Thus, in the bottle closure position, a seal is ensured between the front face of the neck and the plate of the closure element by means of the axial base of the inverted U-shaped seal.

[0074] Furthermore, preferably, as an alternative or in addition, in the position of the bottle being closed by the closing device, the radially outer wing of the inverted U-shaped seal is preferably in contact with the radially inner surface of the fixing skirt and / or the radially inner wing of the inverted U-shaped seal is preferably in contact with the radially outer surface of the stiffening skirt.

[0075] Thus, in the bottle's closed position, a seal is ensured on one side, the other, or both sides of the neck's front face by the fixing skirt and the stiffening skirt of the closure element via the radial contact of the inverted U-shaped seal wings. Furthermore, the use of an inverted U-shaped seal overlapping the bottle's front face compensates for any geometric variations in the neck by guaranteeing constant contact with the part of the closure element with which it cooperates to ensure the bottle's seal in the closed position, thereby improving the long-term reliability of this seal.

[0076] In the embodiment in which the neck of the bottle has, in the vicinity of the opening, a substantially straight tubular shape centered on the longitudinal axis and the front face of the neck, defining the opening of the bottle, is formed by the front wall of the neck connecting the radially inner surface and the radially outer surface and oriented opposite to the bottom of the bottle, the wings of the inverted U-shaped seal are respectively in contact with the radially inner surface and the radially outer surface of the neck.

[0077] In the alternative embodiment in which the front wall of the neck is folded outwards in the radial direction and towards the bottom in the axial direction, so that the neck has a folded portion in the shape of an inverted U having a base defining the front face of the neck, a radially inner wing and a radially outer wing, said wings extending axially on either side of the base, the wings of the inverted U-shaped joint are respectively in contact with the radially inner wing and the radially outer wing of the folded portion of the neck.

[0078] According to a further advantageous provision, regardless of the mode or variant of embodiment envisaged, the fixing skirt and the stiffening skirt of the obturator member defining an annular space between them, the fixing skirt and / or the stiffening skirt have a chamfer flaring outwards from said annular space.

[0079] One or more such chamfers make it easier to introduce the front face of the bottle neck into the annular space of the obturation member defined between the fixing skirt and the stiffening skirt.

[0080] Furthermore, in embodiments in which a sealing element is provided radially between the neck of the bottle and the fixing skirt and / or the stiffening skirt of the closure member, one or more such chamfers allow this sealing element to be progressively compressed during the closure of the bottle by the closure member.

[0081] According to a further advantageous provision, regardless of the mode or variant of embodiment envisaged, the plate of the obturation member has an axial recess defining an internal transverse partition and in which, in the position of obturation of the bottle, the internal transverse partition extends inside the neck, in particular to an axial position located opposite the opening or opposite the external thread.

[0082] Thanks to these provisions, the maintenance of the neck geometry over time and the reduction of the risk of torsional deformation of the neck when the obturation device is screwed onto it are further improved, the internal transverse partition of the obturation element extending in the radial direction forming a reinforcement for the neck in the obturation position of the bottle, located in particular in relation to axial areas of the bottle which are particularly subject to geometric variations in the presence of a humid atmosphere and / or to torsional deformation when the obturation device is screwed onto the neck.

[0083] Generally, whatever the mode or variant of embodiment envisaged, the external thread of the neck, and where applicable the internal thread of the neck, advantageously extends over at least one turn, and in particular over 1.5 turns, around the longitudinal axis.

[0084] Furthermore, regardless of the embodiment or variant considered, the external thread of the neck, and where applicable the internal thread of the neck, advantageously comprises a plurality of threads extending parallel and helically along and around the longitudinal axis, being angularly offset, and preferably uniformly distributed, around the longitudinal axis. Thanks to these arrangements, the bottle has a plurality of what are conventionally called "thread starting points," so that the user can easily and ergonomically match the external thread, and where applicable the internal thread of the bottle neck, with the internal thread of the retaining skirt, and where applicable with the external thread of the stiffening skirt, of the closure device.

[0085] Generally speaking, whatever the mode or variant of embodiment envisaged, the obturator comprises a cellulosic material.

[0086] Thanks to these provisions, the cosmetic product packaging assembly uses a bottle and an associated closure element both comprising a material of the same nature, namely a cellulosic material, thus limiting the use of materials from the petrochemical industry, and allowing these two elements to be included in the same recycling stream, in particular without requiring a prior step of disassembling these elements.

[0087] Moreover, all the preceding provisions are all the more advantageous when the closure device includes a cellulosic material to maintain the geometry over time of both the bottle and the closure device, and to limit the torsional deformation of the neck of the bottle when the closure device is screwed onto it.

[0088] In particular, the cellulosic material included in at least the neck of the bottle, and preferably the entire bottle, and / or in the sealing element includes paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative or bagasse, fibrous residue from sugar cane, or a mixture of these materials.

[0089] Furthermore, according to a general provision, the bottle advantageously houses within it a cosmetic product, in particular a hygiene or body and / or hair care product, such as a shower gel, a shampoo, a conditioner, a body mask, a hair mask or other.

[0090] The invention will be better understood upon reading the following description, accompanied by non-limiting examples of its implementation, with reference to the accompanying drawings, in which:

[0091] [Fig. 1] represents a perspective view of a cosmetic product packaging assembly according to the invention;

[0092] [Fig.2] is a longitudinal sectional view along plane P of [Fig.1];

[0093] [Fig.3] is an enlarged view of the detail circled in [Fig.2];

[0094] [Fig.4] is a view similar to that of [Fig.2], illustrating a variant of realization ;

[0095] [Fig.5] is an enlarged view of the detail circled in [Fig.4];

[0096] [Fig.6] is a longitudinal cross-sectional view of the obturator element of the assembly cosmetic product packaging according to the invention, shown upside down, and illustrating a phase of depositing a sealing gasket within said sealing organ by means of a deposition cannula;

[0097] [Fig.7] is a view similar to those of figures 3 and 5, illustrating in right half section a variant of the sealing between the closure member and the bottle of a cosmetic product packaging assembly;

[0098] [Fig. 8] is a view similar to those in Figures 3, 5 and 7, illustrating a mode of alternative design of the bottle neck belonging to a cosmetic product packaging assembly;

[0099] [Fig.9] is a view similar to those in Figures 3, 5, 7 and 8, illustrating a variant of the alternative embodiment of the neck of the bottle belonging to a cosmetic product packaging assembly;

[0100] [Fig. 10] illustrates in longitudinal section a soaking phase of the neck end defining the opening of the bottle in a sealing bath to obtain an inverted U-shaped seal overlapping this end of the neck;

[0101] [Fig. 11] illustrates in longitudinal section a bottle neck the end of which is provided of an inverted U-shaped joint obtained after soaking in a joint bath;

[0102] [Fig. 12] illustrates in longitudinal section a phase of obturating the bottle obtained after soaking illustrated in [Fig. 10] by a sealing device;

[0103] [Fig. 13] is a view similar to those in Figures 3, 5, and 7 to 9, illustrating the bottle and the obturating organ of the [Fig. 11], in obturating position;

[0104] [Fig. 14] is a view similar to those in Figures 3, 5, 7 to 9 and 13, illustrating a variant of achieving the seal between the closure element and the bottle of a cosmetic product packaging assembly, in the alternative embodiment of the bottle neck;

[0105] [Fig. 15] is a view similar to those in Figures 3, 5, 7 to 9 and 13, illustrating a variant of the obturator assembly.

[0106] In [Fig. 1], a cosmetic product packaging assembly 1 according to the invention is shown. Such an assembly comprises a bottle 2 extending along a longitudinal axis X and a closure element 3 adapted to selectively adopt a closure position of the bottle 2 and a release position of the bottle 2 allowing access to its contents and enabling their dispensing.

[0107] Such a bottle 2 can for example house within it a cosmetic product, in particular a hygiene or body and / or hair care product, such as a shower gel, a shampoo, a conditioner, a body mask, a hair mask or other.

[0108] As can be seen in particular in figures 2 and 4, the bottle 2 comprises a base 20, a neck 21 and a side wall 22 connecting said base 20 to said neck 21.

[0109] Furthermore, and as can be seen in particular in figures 3, 5, 7 to 12 and 15, the neck 21 of the bottle 2 has a front face 25,250 defining an opening O allowing access to the contents of the bottle 2. The closure member 3 is adapted to selectively adopt a closure position of the opening O of the bottle 2 and a clearance position of the opening O of the bottle 2 allowing access to its contents and to allow its distribution through the opening O.

[0110] As can be seen in all the figures, the neck 21 of the bottle 2 comprises a radially inner surface 23 and a radially outer surface 24, connected by a front wall 25.

[0111] The radially external surface 24 of the neck 21 is provided with an external thread 26, extending over a threaded axial portion PF, visible in particular in figures 3, 5, 8, 9, 10 and 15. The external thread 26 of the neck 21 extends over at least one turn, and in particular over 1.5 turns, around the longitudinal axis X.

[0112] In the illustrated embodiments, the external thread 26 of the neck 21 comprises a single thread. Alternatively, the external thread 26 of the neck 21 may comprise a plurality of threads, for example two or three threads, extending parallel to each other in a helix along and around the longitudinal axis X, being angularly offset, and preferably uniformly distributed, around the longitudinal axis X.

[0113] At least the neck 21, and preferably the entire bottle 2, is made of a material comprising a cellulosic material. Such a cellulosic material includes, for example, paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative, or bagasse, a fibrous residue from sugar cane, or a mixture of these materials.

[0114] The inner wall of bottle 2 may optionally be provided with a coating made of a material that is impermeable to the cosmetic product received within bottle 2.

[0115] In embodiments, visible in figures 2 to 5, 7, 10 to 13 and 15, the neck 21 of the bottle 2 has, in the vicinity of the opening O, a substantially straight tubular shape, centered on the longitudinal axis X. In this embodiment, the front face of the neck 21, defining the opening O of the bottle 2, is formed by the front wall 25 of the neck 21 connecting the radially inner surface 23 and the radially outer surface 24 and oriented opposite to the bottom 20 of the bottle 2.

[0116] In alternative embodiments, visible in Figures 8, 9, and 14, the front wall 25 of the neck 21 is folded outwards in the radial direction and towards the bottom 20 in the axial direction, so that the neck 21 has a folded portion with an inverted U-shaped longitudinal cross-section. The folded portion of the neck 21 has a base 250 defining the front face of the neck 21, a radially internal wing 251, and a radially external wing 252, said wings 251 and 252 extending axially on either side of the base 250. Thus, in this alternative embodiment, the front face of the neck 21, defining the opening O of the bottle 2, is formed by the base 250 of the folded portion with an inverted U-shaped longitudinal cross-section of the neck 21.Furthermore, and as can be seen in these figures 8, 9 and 14, the radially inner wing 251 of the folded-down portion of the neck 21 has a radially inner surface which is preferably located in the axial extension of the radially inner surface 23 of the neck 21.

[0117] Thus, in these alternative embodiments, the neck 21 of the bottle 2 has a reinforcement at the level of the opening O, allowing to increase the intrinsic rigidity of the neck 21 of the bottle 2 in this area subject to phenomena of fluctuations in geometry over time when subjected to a humid atmosphere, of deformation in particular in torsion around the longitudinal axis when the closure member is screwed onto the neck or of conformation following repeated associations with a closure member, said neck 21 having at the level of the opening O a double wall thickness formed by the radially internal wings 251 and radially external wings 252 of the folded portion of the neck 21, connected by the base 250 of the folded portion of the neck 21 extending substantially in the radial direction.

[0118] As shown in Figures 2 to 9 and 12 to 15, the sealing member 3 comprises a plate 30 adapted to seal the opening O of the bottle 2 in the sealed position. The sealing member 3 further comprises a radially external retaining skirt 31, extending from the plate 30 and having a radially internal surface 32 and a radially external surface 33. The radially internal surface 32 of the retaining skirt 31 is provided with an internal thread 34 adapted to cooperate with the external thread 26 of the neck 21 of the bottle 2 in the sealed position by the sealing member 3.

[0119] In the illustrated embodiments, the sealing element 3 is also made of a material comprising a cellulosic material. Such a cellulosic material includes, for example, paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative, or bagasse, a fibrous residue from sugar cane, or a mixture of these materials.

[0120] The walls of the sealing element 3 which are to come into contact with the cosmetic product may optionally be provided with a coating made of a material that is impermeable to the cosmetic product received in the bottle 2.

[0121] In the embodiments illustrated in figures 2 to 9 and 12 to 14, the plate 30 of the obturation member 3 is substantially flat and extends transversely to the longitudinal axis X of the bottle 2 in the obturation position, above the opening O of the neck 21.

[0122] Alternatively, and as illustrated in [Fig. 15], the plate 30 of the obturation element 3 may have an axial recess 300 defining an internal transverse partition 301 extending inside the neck 21, at or below the opening O, and in particular at an axial position located opposite the opening O or opposite the external thread, in the axial threaded portion PF. The internal transverse partition 301 of the obturation element 3 extending in the radial direction forms a reinforcement, a buttress, for the neck 21 in the obturation position of the bottle 2, located in particular opposite axial areas of the bottle 2 that are particularly prone to variations geometric in the presence of a humid atmosphere and / or torsional deformation when the sealing member 3 is screwed onto the neck 21.

[0123] Furthermore, and still in relation to figures 2 to 9 and 12 to 15, the sealing member 3 further comprises a stiffening skirt 35, radially internal, erected from the plate 30 and having a radially internal surface 36 and a radially external surface 37.

[0124] In the position of the bottle 2 being closed by the closing member 3, illustrated in figures 2 to 5, 7 to 9 and 13 to 15, the neck 21 of the bottle 2 is radially clamped, or in other words bordered on both sides in the radial direction, between the fixing skirt 31 and the stiffening skirt 35 of the closing member 3.

[0125] In the embodiments illustrated in figures 2 to 5, 7, 10 to 13 and 15, in the position of closure of the bottle 2 by the closure member 3, the neck 21 of the bottle 2, which is substantially tubular in shape, is radially clamped between the fixing skirt 31 and the stiffening skirt 35 of the closure member 3.

[0126] In the embodiments illustrated in figures 2 to 5 and 15, in the closure position of the bottle 2, the radially external surface 24 of the neck 21 is located opposite the radially internal surface 32 of the fixing skirt 31, the radial distance separating these surfaces being preferably less than 2 mm, better less than 1 mm and for example on the order of 0.5 mm, in particular at the opening O.

[0127] In the embodiments illustrated in Figures 7, 10 to 13, in the closure position of the bottle 2, the radially outer surface 24 of the neck 21 is in contact with the radially inner surface 32 of the fixing skirt 31, possibly through the radially outer wing 42” of a joint of inverted U-shaped longitudinal section 4’ ’ overlapping the front face of the neck defined by the front wall 25 of the neck 21, as will be described in more detail later, the radial distance separating these surfaces being close to zero, or even negative, implying in the latter case a clamping fixing of the fixing skirt 31 on the neck 21 and a tight assembly at the interface between these two elements located between the radially inner surface 32 of the fixing skirt 31 and the radially outer surface 24 of the neck 21, in particular at the opening O.

[0128] In the embodiments illustrated in Figures 2, 3, and 15, in the closed position of the bottle 2, the radially inner surface 23 of the neck 21 is in contact with the radially outer surface 37 of the stiffening skirt 35, particularly at the opening O. The radial distance separating these surfaces is close to zero, or even negative, implying in the latter case a tight fit of the stiffening skirt 35 into the neck 21 and a tight assembly at the interface between these two elements located between the radially inner surface 23 of the neck 21 and the surface radially outside 37 of the stiffening skirt 35, in particular at the level of the opening O.

[0129] In the embodiments illustrated in figures 4, 5, 7 and 10 to 13, in the closed position of the bottle 2, the radially inner surface 23 of the neck 21 is located opposite the radially outer surface 37 of the stiffening skirt 35, in particular at the opening O, due in particular to the presence of a longitudinally cross-section joint in the shape of an inverted U 4” overlapping the front face of the neck defined by the front wall 25 of the neck 21, as will be described in more detail later, the radial distance separating these surfaces being preferably less than 2 mm, better less than 1 mm and for example on the order of 0.5 mm, in particular at the opening O.

[0130] In alternative embodiments, visible in figures 8, 9 and 14, in the position of closure of the bottle 2 by the closure member 3, the folded portion of the neck 21 is radially clamped between the fixing skirt 31 and the stiffening skirt 35 of the closure member 3.

[0131] In alternative embodiments, visible in Figures 8, 9 and 14, in the closed position, the radially outer surface of the radially outer wing 252 of the folded portion of the neck 21 is in contact with the radially inner surface 32 of the fastening skirt 31, in particular at the opening O, possibly via the radially outer wing 42” of a longitudinal joint in the shape of an inverted U 4” overlapping the front face of the neck defined by base 250 of the folded portion of the neck 21, as will be described in more detail later, the radial distance separating these surfaces being close to zero, or even negative,involving in the latter case a clamping of the fixing skirt 31 on the collar 21 and a tight assembly at the interface between these two elements located between the radially inner surface 32 of the fixing skirt 31 and the radially outer surface of the radially outer wing 252 of the folded portion of the collar 21, in particular at the opening O. ,

[0132] In the alternative embodiments illustrated in Figures 8, 9, and 14, in the closed position of the bottle 2, the radially inner surface of the radially inner wing 251 of the folded-down portion of the neck 21 is in contact with the radially outer surface 37 of the stiffening skirt 35, in particular at the opening O, possibly via the radially inner wing 41 of a longitudinal joint in the shape of an inverted U 4'' overlapping the front face of the neck defined by the base 250 of the folded-down portion of the neck 21, as will be described in more detail later, the radial distance separating these surfaces being close to zero, or even negative, implying in the latter case a tight fit of the stiffening skirt 35 in the neck 21 and a tight fit at the interface between these two elements located between the radially inner surface of the radially inner wing 251 of the folded portion of the neck 21 and the radially outer surface 37 of the stiffening skirt 35, in particular at the level of the opening O.

[0133] In the alternative embodiment illustrated in [Fig.8], the radially inner wing 251 and the radially outer wing 252 of the folded-down portion of the neck 21 are in contact with each other in the radial direction.

[0134] In the alternative embodiment illustrated in [Fig.9], the radially inner wing 251 and the radially outer wing 252 of the folded-down portion of the neck 21 provide a space between them in the radial direction.

[0135] In this alternative embodiment of [Fig. 9], an elastic element 4'”, in particular an element having an intrinsic elasticity greater than that of the material constituting the neck 21 of the bottle 2, is advantageously arranged between the wings 251, 252 defined by the folded-down portion of the neck. Thus, a certain elasticity in the radial direction is imparted to the neck 21 between the wings 251, 252 of the folded-down portion of the neck. In the case where, in the closed position of the bottle 2, the radially outer wing 252 of the folded-down portion of the neck 21 is in contact with the radially inner surface 32 of the retaining skirt 31 of the closure element 3 and the radially inner wing 251 of the folded-down portion of the neck 21 is in contact with the radially outer surface 37 of the stiffening skirt 31 of the closure element 3, the elastic organ is compressed in the radial direction.This ensures that in the bottle 2 closure position, the radially outer wing 252 of the folded-down portion of the neck 21 is firmly pressed against the radially inner surface 32 of the fixing skirt 31 of the closure member 3 and that the radially inner wing 251 of the folded-down portion of the neck 21 is firmly pressed against the radially outer surface 37 of the stiffening skirt 35 of the closure member 3. .

[0136] Furthermore, as can be seen in the figures, the fixing skirt 31 and the stiffening skirt 35 of the obturation member 3 define an annular space between them, and the stiffening skirt 35 has a chamfer 39 that flares outwards from said annular space. Such a chamfer 39 facilitates the insertion of the front face 25, 250 of the neck 21 of the bottle 2 into the annular space of the obturation member 3 defined between the fixing skirt 31 and the stiffening skirt 35.

[0137] As illustrated in these figures 2 to 5, 7 to 9 and 13 to 15, the stiffening skirt 35 has a length taken along the longitudinal axis X such that it extends from the plate 30 and over the entire length of the threaded portion PF of the neck 21, in the bottle 2 closure position.

[0138] Advantageously, in the position of the bottle 2 being closed by the closing member 3, the radially outer surface 37 of the stiffening skirt 35 extends at least in view, or even in contact, of the radially inner surface 23 of the neck, at least in the axial threaded portion PF of the neck 21 in which the external thread 26 extends.

[0139] When the stiffening skirt 35 is designed and dimensioned so that, in the bottle 2 closure position, the radially outer surface 37 is in contact with the radially inner surface 23 of the neck 21, at least in the axial threaded portion PF, the radial distance separating these two surfaces 37, 23 in this axial portion is close to zero, or even negative, implying in the latter case an insertion with clamping of the stiffening skirt 37 in the neck 21 and a tight assembly at the interface between these two elements located between the radially outer surface 37 of the stiffening skirt 35 and the radially inner surface 23 of the neck 21, in the axial threaded portion PF, at least.Figures 2, 3, 8, 9 illustrate embodiments in which the stiffening skirt 35 has been designed and dimensioned so that, in the bottle 2 closure position, the radially outer surface 37 is in contact with the radially inner surface 23 of the neck 21, at least in the threaded axial portion PF.

[0140] When the stiffening skirt 35 is designed and dimensioned so that, in the bottle 2 closure position, the radially outer surface 37 is opposite the radially inner surface 23 of the neck 21, at least in the axial threaded portion PF, the radial distance separating these two surfaces 37, 23 in this axial portion is preferably less than 2 mm, better less than 1 mm, and for example on the order of 0.5 mm. Figures 4, 5, 7, 13, and 14 illustrate embodiments in which the stiffening skirt 35 has been designed and dimensioned so that, in the bottle 2 closure position, the radially outer surface 37 is opposite the radially inner surface 23 of the neck 21, at least in the axial threaded portion PF.

[0141] Thus, when the radially external surface 37 is in contact or opposite, i.e. at a short radial distance, from the radially internal surface 23 of the neck 21, the stiffening skirt 35 of the closure member forms a buttress of the neck 21 in its externally threaded portion PF when screwing the closure member 3 into the closure position of the bottle 2, thus limiting the deformation in particular in torsion of the neck during this screwing operation.

[0142] According to a particular arrangement, and as shown in [Fig. 3], the collar 21 has a first thickness e1, measured between the radially inner surface 23 and the radially outer surface 24, excluding the thread 26, which is substantially constant in the axially threaded portion PF. The stiffening skirt 35 has, at least in the area in contact with or opposite the radially inner surface 23 of the collar 21 in the closed position, a second thickness e2, measured between the radially inner surface 36 and the radially outer surface 37. Here, the second thickness e2 is substantially constant over the entire axial height of the stiffening skirt 35 of the obturator member 3. Advantageously, the second thickness e2 is greater than or equal to the first thickness el, and in particular greater than or equal to 1.5 times the first thickness el.

[0143] Thus, according to these arrangements, in the closed position of the bottle 2, the neck 21 of the bottle 2 is stiffened, particularly in the radial direction, at least in the axial portion PF in which the external thread 26 extends, by means of a stiffening skirt 35 of the closure member 3 with a thickness e2 greater than that e1 of the neck 21 in this axial portion PF. Such arrangements are particularly advantageous in the case where the closure member 3 also comprises a cellulosic material.

[0144] According to another particular arrangement, and as illustrated in particular in Figures 4 and 5, the radially inner surface 23 of the neck 21 is provided with an internal thread 27, extending opposite the external thread 26 formed on the radially outer surface 24 of the neck 21. Advantageously, the radially outer surface 37 of the stiffening skirt 35 of the closure member 3 is provided with an external thread 38 adapted to cooperate with the internal thread 27 of the neck 21 in the closure position of the bottle 2. In the embodiment illustrated in these Figures 4 and 5, the internal thread 27 of the neck 21 extends opposite the external thread 26, in the same axial portion PF, recessed on the radially inner surface 23 of the neck 21. Such an internal thread 27 on the neck 21 can, for example, result from the manufacturing process of the bottle 2 and of the formation of the external thread 26 of the collar 21, as described, for example, in the aforementioned document CN115341415A.

[0145] Thus, in the position of the bottle 2 being closed by the closing member 3, the neck 21 is clamped between the internal thread 34 of the fixing skirt 31 and the external thread 38 of the stiffening skirt 38, in the axial portion PF in which the external thread 26 and the internal thread 27 extend, by the cooperation respectively of the internal thread 34 of the fixing skirt 31 with the external thread 26 of the neck 21 and of the external thread 38 of the stiffening skirt 35 with the internal thread 27 of the neck 21.

[0146] According to yet another particular arrangement, illustrated in [Fig. 7], the radially outer surface 37 of the stiffening skirt 35 has an annular groove 370 partially housing an O-ring 4'. This O-ring 4' arranged in the annular groove 370 is adapted to be placed in tight contact with the radially inner surface 23 of the neck 21 in the bottle 2 closure position.

[0147] In the embodiment of [Fig. 7], the annular groove 370 and the O-ring 4' are placed on the stiffening skirt 35 at a defined axial position so as to be in contact, in the bottle 2 closure position, with the inner surface 23 of the neck 21 in the vicinity of the opening O. This provides a seal in the radial direction of the bottle 2 in the closure position by the closure device 3, without the frontal face 25, 250 of the neck 21 is not subjected to an axial force exerted by the obturator 3, which would be likely to alter its geometry.

[0148] Alternatively, or possibly in addition, and as illustrated in Figures 2 to 6, 8 and 12 to 15, in the closed position of the bottle 2, the front face 25, 250 of the neck 21, defined either by the front wall 25 of the neck 21, or by the base 250 of the folded portion of the neck 21, is in contact with the plate 30 of the closure member 3, preferably by means of a seal 4, 4”, in particular flat, fixed on the plate 30 of the closure member 3 in the annular space defined between the fixing skirt 31 and the stiffening skirt 35 or on the front face 25, 250 of the neck 21.

[0149] More specifically, in the embodiment of figures 2 to 6, 8 and 15, the seal 4 is flat, has an annular shape and is fixed on the plate 30 of the obturator member 3 in the annular space defined between the fixing skirt 31 and the stiffening skirt 35.

[0150] Horn visible on [Fig.6], such a seal 4 can advantageously be deposited in this annular space by means of a deposition cannula C inserted between the fixing skirt 31 and the stiffening skirt 35 of the obturator member 3, with its orifice for distributing the material constituting the seal positioned opposite the inner surface of the plate 30. Alternatively, such a seal could be manufactured as an element separate from the obturator member 3 and fixed in it, in particular on the inner surface of the plate 30, for example by bonding or by any suitable means.

[0151] According to yet another particular arrangement, illustrated in figures 10 to 14, the bottle 2 is provided with a 4" inverted U-shaped longitudinal section seal overlapping the front face 25, 250 of the neck 21. The 4" inverted U-shaped seal has a base 40" in contact with the front face 25, 250 of the neck 21, a radially inner wing 41" and a radially outer wing 42", said wings 41", 42" extending axially on either side of the front face 25, 250 of the neck 21.

[0152] In the embodiments illustrated in figures 10 to 13, in which the front face of the neck is defined by the front wall 25, the base 40' ' of the inverted U-shaped joint 4" is in contact with the front wall 25 of the neck 21, the radially inner wing 41" of the inverted U-shaped joint 4" is in contact with the radially inner surface 23 of the neck 21 and the radially outer wing 42" of the inverted U-shaped joint 4" is in contact with the radially outer surface 24 of the neck 21.

[0153] In the alternative embodiment illustrated in [Fig. 14], in which the front face of the neck is defined by the base 250 of the folded-down portion of the neck 21, the base 40'' of the inverted U-shaped joint 4'' is in contact with the base 250 of the folded-down portion of the neck 21, the radially inner flange 41" of the inverted U-shaped joint 4" is in contact with the radially inner surface of the radially inner flange 251 of the folded-down portion of the neck 21, and the radially outer flange 42" of the U-shaped joint The inverted U 4” is in contact with the radially outer surface of the radially outer wing 252 of the folded-down portion of the collar 21.

[0154] Advantageously, and as illustrated in particular in Figures 13 and 14, in the bottle 2 closure position, the base 40” of the inverted U-shaped seal 4” is in axial contact, specifically compressed in the axial direction, against the plate 30 of the closure member 3, thus achieving axial sealing of the bottle 2 by the closure member 3. In such a case, the embodiment of [Fig. 14], in which the neck 21 has a folded-down portion, is particularly advantageous, the base 250 and the wings 251, 252 of the folded-down portion of the neck providing a base and increased stability for the base of the seal 40” on which the axial sealing force is exerted, thus limiting the risk of deformation of the neck 21 in the axial direction when the bottle 2 is closed.

[0155] Alternatively or in addition, always as illustrated in Figures 13 and 14, in the bottle 2 closure position, the radially inner wing 41” of the inverted U-shaped seal 4” is in radial contact, being in particular compressed in the radial direction, against the radially outer surface 37 of the stiffening skirt 35 of the closure member 3, a first radial sealing of the bottle 2 by the closure member 3 being thus achieved.

[0156] Furthermore, as an alternative or in addition and still as illustrated in figures 13 and 14, in the bottle 2 closure position, the radially outer wing 42” of the inverted U-shaped seal 4’ ’ is in radial contact, being in particular compressed in the radial direction, against the radially inner surface 32 of the fixing skirt 31 of the closure member 3, a second radial sealing of the bottle 2 by the closure member 3 being thus achieved.

[0157] When the bottle 2 is in the sealing position by the sealing member 3, the axial seal, as well as the first and second radial seals are ensured, the sealing of the bottle 2 by the sealing member 3 is made reliable and maintained over time, despite possible geometric fluctuations of the neck.

[0158] Such an inverted U-shaped joint 4' ' can advantageously be deposited on the front face 25, 250 on the front and on the other hand either on the radially inner surface 23 and on the radially outer surface of the neck 21 in the embodiment of Figures 10 to 13, or on the radially inner surface of the radially inner wing 251 and on the radially outer surface of the radially outer wing 252 of the folded portion of the neck 21 in the embodiment of [Fig. 14], by dipping in a bath of joint constituent material.

[0159] Thus, and as illustrated in Figures 10 and 11, in relation to the embodiment of Figures 12 and 13, a method for depositing a 4” longitudinal section joint in An inverted U shape overlapping the frontal face, formed here by the frontal wall 25 of the neck 21, will be described.

[0160] In a first step of this process, a bath of joint constituent material M is supplied in a fluid or paste-like state. The joint constituent material M may, for example, be a polyurethane sealant, in particular a one-component sealant, such as the product Sikaflex®-221 marketed by SIKA®.

[0161] In a second step of this process, a bottle is provided having one, the other, or a combination of the characteristics described above.

[0162] The bottle 2 is then oriented "head down", that is to say so that the front face 25 of the neck 21 is opposite the bath of seal material M, with the longitudinal axis X oriented perpendicular to the surface of this bath, as illustrated in [Fig.10],

[0163] A soaking, an immersion of the front face 25 of the neck 21 of the bottle 2 in the bath of seal constituent material M is then carried out by moving the bottle in translation along the arrow Fl illustrated in [Fig.10], and to a depth relative to the surface of the bath of seal constituent material M corresponding to the axial height that is to be obtained of the wings 41”, 42” of the inverted U-shaped seal 4”.

[0164] The front face 25 of the neck 21 is then extracted from the bath of seal material M, by moving the bottle in translation along the arrow F2 illustrated on [Fig.1 1], away from this bath.

[0165] The tooling used to immerse the front face of the bottle neck in the bath of seal material and to extract it from this bath can, for example, be a dip coating machine marketed by the NADETACH® Company.

[0166] A final solidification step is then carried out on the neck 21 of the bottle 2. This solidification step can be achieved by simple air drying. Alternatively, this solidification step includes a crosslinking operation on the seal material deposited on the neck 21 of the bottle 2, notably using ultraviolet rays.

[0167] Once the constitutive material of the seal has solidified, the base 40” and the wings 41”, 42” of the inverted U-shaped seal 4’ ’ adopt a solid state and together form the inverted U-shaped seal 4” overlapping the front face 25 of the neck 21 of the bottle 2.

[0168] Thus, thanks to these various arrangements, taken in all technically possible combinations, the invention proposes a cosmetic product packaging assembly in which the long-term maintenance of the seal in the bottle closure position by the closure element is improved and in which the functionality of the screw assembly of the closure element on the neck of the bottle is preserved, by despite the use of cellulosic material for the neck of the bottle and the potential geometric variations that may occur in the presence of humidity.

Claims

1. Demands Cosmetic product packaging assembly (1), comprising: - a bottle (2) extending along a longitudinal axis (X) and comprising a base (20), a neck (21) and a side wall (22) connecting said base to said neck, said neck (21) having a front face (25, 250) defining an opening (O) and comprising a radially internal surface (23) and a radially external surface (24) connected by a front wall (25), said radially external surface (24) being provided with an external thread (26) extending into a threaded axial portion (PF); - a bottle closure member (3) comprising a plate (30) adapted to close the opening (O) in the closure position of the bottle (2) and a radially external fixing skirt (31) extending from the plate (30) and having a radially internal surface (32) and a radially external surface (33), said radially internal surface (32) being provided with an internal thread (34) adapted to cooperate with the external thread (26) in the closure position of the bottle (2), in which at least the neck (21) of the bottle (2), and preferably the entire bottle (2), comprises a cellulosic material, in which the closure member (3) further comprises a radially internal stiffening skirt (35) extending from the plate (30) and having a radially internal surface (36) and a radially external surface (37), and wherein, in the bottle (2) closure position, the neck (21) is radially clamped between the fixing skirt (31) and the stiffening skirt (35) of the closure member (3), the radially outer surface (37) of the stiffening skirt (35) extending opposite, and preferably in contact with, the radially inner surface (23) of the neck (21) at least in the axial portion (PF) in which the external thread (26) extends, wherein the external thread (26) of the neck (21) extends over an axial portion in which the neck (21) has a first thickness (11), wherein the stiffening skirt (35) of the closure member (3) has, at least in the area opposite or in contact with the radially inner surface (23) of the neck (21) in the bottle (2) closure position, a second thickness (e2), and in which the second thickness (e2) is greater than or equal to the first thickness (el), in particular greater than or equal to 1.5 times the first thickness (el), and in particular close to 2 times the first thickness (el), and / or in which the radially inner surface (23) of the neck (21) is provided with an internal thread (27), extending in particular opposite the external thread (26) formed on the radially outer surface (24) of the neck (21), and in which the radially outer surface (37) of the stiffening skirt (35) of the closure member (3) is provided with an external thread (38) adapted to cooperate with the internal thread (27) of the neck (21) in the closure position of the bottle (2).

2. Assembly (1) according to claim 1, wherein, in the bottle (2) closure position, the front face (25, 250) of the neck (21) is in contact with the plate (30) of the closure member (3), preferably by means of a seal (4, 4”), in particular flat, fixed on the plate (30) of the closure member (3) in an annular space defined between the fixing skirt (31) and the stiffening skirt (35) or on the front face (25, 250) of the neck (21).

3. Assembly (1) according to any one of claims 1 to 2, wherein the radially outer surface (37) of the stiffening skirt (35) or the radially inner surface (32) of the fixing skirt (31) has an annular groove (370) partially housing an O-ring (4') in tight contact with the radially inner surface (23) of the neck (21), respectively with the radially outer surface (24) of the neck (21), in the bottle (2) closure position.

4. Assembly (1) according to any one of claims 1 to 3, wherein the front wall (25) of the neck (21) is folded outwards in the radial direction and towards the bottom (20) in the axial direction, such that the neck (21) has a folded-over portion of inverted U-shaped longitudinal cross-section having a base (250) defining the front face of the neck (21), a radially inner wing (251) and a radially outer wing (252), said wings (251, 252) extending axially on either side of the base (250), and wherein, in the position of the bottle (2) being closed by the closing device (3), the radially outer wing (252) of the folded-over portion of the neck (21) is opposite, and preferably in contact with, the radially inner surface (32) of the skirt of the fixing (31) of the obturation member (3) and / or the radially inner wing (251) of the folded-down portion of the neck (21) is opposite, preferably in contact, the radially outer surface (37) of the stiffening skirt (31) of the obturation member (3), in particular at the opening (0).

5. Assembly (1) according to claim 4, wherein an elastic element (4'”) is arranged between the wings (251, 252) defined by the folded-down portion of the neck (21).

6. Assembly (1) according to any one of claims 1 to 5, wherein the bottle (2) is provided with a seal (4”) of inverted U-shaped longitudinal cross-section overlapping the front face (25, 250) of the neck (21), having a base (40”) in contact with the front face (25, 250) of the neck (21), a radially inner wing (41”) and a radially outer wing (42”), said wings (41”, 42”) extending axially on either side of the front face (25, 250) of the neck (21), and wherein, in the position of the bottle (2) being closed by the closing member (3),the base (40”) of the inverted U-shaped joint (4”) is preferably in contact with the plate (30) and / or the radially outer flange (42”) of the inverted U-shaped joint (4”) is preferably in contact with the radially inner surface (32) of the fastening skirt (31) and / or the radially inner flange (41”) of the inverted U-shaped joint (4”) is preferably in contact with the radially outer surface (37) of the stiffening skirt (35).

7. Assembly (1) according to claim 6, wherein the front face of the neck (21) is defined by the front wall (25) of the neck (21), and wherein the wings (41”, 42”) of the inverted U-shaped joint (4”) are respectively in contact with the radially inner surface (23) and the radially outer surface (24) of the neck (21).

8. Assembly (1) according to claim 6, in its connection with any one of claims 6 and 7, wherein the front face of the neck (21) is defined by the base (250) of the folded-down portion of the neck (21), and wherein the wings (41”, 42”) of the inverted U-shaped joint (4”) are respectively in contact with the radially inner wing (251) and the radially outer wing (252) of the folded-down portion of the neck (21).

9. Assembly (1) according to any one of claims 1 to 8, wherein, the fixing skirt (31) and the stiffening skirt (35) of the sealing member (3) defining between them an annular space, the fixing skirt (31) and / or the stiffening skirt (35) have a chamfer (39) flaring outwards from said annular space.

10. Assembly (1) according to any one of claims 1 to 9, wherein the plate (30) of the closure member (3) has an axial recess (300) defining an internal transverse partition (301) and wherein, in the bottle closure position (2), the internal transverse partition (301) extends inside the neck (21), in particular at an axial position located opposite the opening (O) or opposite the external thread (26).

11. Assembly (1) according to any one of claims 1 to 10, wherein the external thread (26) of the neck (21) of the bottle (2) extends over at least one turn, and in particular over 1.5 turns, around the longitudinal axis (X).

12. Assembly (1) according to any one of claims 1 to 11 in which the external thread (26) of the neck (21) comprises a plurality of threads extending parallel in a helix along and around the longitudinal axis (X) being angularly offset, and preferably uniformly distributed, around the longitudinal axis (X).

13. Assembly (1) according to any one of claims 1 to 12, wherein the sealing member (3) comprises a cellulosic material.

14. Assembly (1) according to any one of claims 1 to 13, wherein the cellulosic material included in at least the neck (21) of the bottle (2), and preferably the entire bottle (2), and / or in the closure member (3) comprises paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative or bagasse, fibrous residue from sugar cane, or a mixture of these materials.

15. Assembly (1) according to any one of claims 1 to 14, wherein the bottle (2) contains within it a cosmetic product, in particular a hygiene or body and / or hair care product.

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