Cosmetic product packaging assembly comprising a bottle at least partly made of cellulosic material and a closure member

Abstract

TITLE Cosmetic product packaging assembly comprising a bottle at least partly made of cellulosic material and a closure member 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 in a threaded axial portion (PF);- a closure member comprising a plate (30) and a fixing skirt (31) provided with an internal thread (34) adapted to cooperate with the external thread (26) in the closure position of the bottle (2), in which the bottle is provided with a seal (4'') of longitudinal section in the shape of an inverted U overlapping the front face (25) of the neck (21), having a base (40'') in contact with said front face (25), a radially inner wing (41''), and a radially outer wing (42''), extending axially on either side of said front face (25, 250), and in which, in the closure position of the bottle, the base (40'') is in contact with the plate (30) and / or the radially outer wing (42'') is in contact with the radially inner surface (32) of the fixing skirt (31), in particular at the level of the opening (O). Figure for the abstract: Fig. 12.;

Description

Title of the invention: Cosmetic product packaging assembly comprising a bottle at least partly made of cellulosic material and a closure member

[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, relating to cosmetic products.

[0003] More specifically, the present invention relates to a cosmetic product packaging assembly comprising a bottle and a closure member adapted to seal the bottle in a sealed manner in the closure position and to clear an opening in the bottle and allow the dispensing of the cosmetic product contained therein in the dispensing position.

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

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

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

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

[0008] It is therefore essential to design products that can reduce the quantity of materials used and / or replace 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, particularly by reducing the use of raw materials from petrochemicals.

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

[0011] In this context, with a view to reducing the environmental impact of its activity, whether during the manufacture of the packaging assemblies or at the end of their life, in particular to promote their recycling, the cosmetics industry tends to substitute, to replace the plastic materials used to manufacture the components of the 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 the majority, or even the entirety of the bottle comprises a cellulosic material.

[0012] These cellulosic materials used to produce at least part of the bottle comprise, 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 of improving the recyclability and / or degradability of the bottle, these materials also being able to advantageously come from recycling sectors.

[0013] For example, in this field, document CN115341415A is known, which describes the manufacture of a bottle made entirely of cellulosic material, adapted to be closed by a closing member as defined above, also made of cellulosic material.

[0014] However, the use of such cellulosic materials to produce all or part of the bottle, and in particular its neck, is likely to give rise to certain specific problems, which do not arise 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 implementing such a bottle associated with a closure member.

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

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

[0017] Finally, it has also been 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 member, causing fluctuations in its geometry.

[0018] Such fluctuations over time in the geometry of the bottle, and in particular in its neck, modify the contact zones between the neck of the bottle and the closure member with which it is associated in the bottle closure position, and risk causing sealing defects in the packaging assembly when the closure member closes the bottle, as well as difficulties in positioning the closure member on the bottle.

[0019] Conventionally, on a closure member intended to close a bottle, it is known to provide a radially inner sealing skirt, extending from the plate of the closure member and designed to be inserted inside the neck and come into contact with its radially inner surface to ensure the sealing of the assembly in the position for closing the bottle. However, such a closure member structure is not capable of guaranteeing that the sealing of the packaging assembly in the position for closing the bottle by the closure element is maintained over time, when at least the neck of the bottle comprises a cellulosic material.

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

[0021] Thus, when the closure member 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 fastening skirt of the closure member, 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 member carried out by the user during the life cycle of the packaging assembly, there is a risk that the neck of the bottle will deform and in particular twist around the axis Ion- horizontal of the bottle, such deformation risking causing leaks in the bottle in the position of closure by the closure member, or even difficulty and ultimately impossibility of screwing the closure member 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 closure member and a bottle of which at least the neck comprises a cellulosic material, in which the geometry of the neck is preserved over time, with the aim of maintaining the seal in the closure position of the bottle by the closure element and the proper functioning of the screwed assembly between the closure member and the neck of the bottle.

[0023] The present invention aims to meet these objectives and proposes for this purpose a cosmetic product packaging assembly, comprising: - a bottle extending along a longitudinal axis and comprising a bottom, a neck and a side wall connecting said bottom to said neck, said neck having a front face, also referred to as the mouth of 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 over a threaded axial portion; - a bottle closure member comprising a plate adapted to close the opening in the bottle closure position and a radially external fixing skirt, raised 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, wherein at least the neck of the bottle, and preferably the entire bottle, comprises a cellulosic material, in which the bottle is provided with a seal of longitudinal section 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, and in which, in the position of closure of the bottle by the closure member, the base of the seal in the shape of an inverted U is preferably in contact with the plate and / or the radially outer wing of the seal in the shape of an inverted U is preferably in contact with the radially inner surface of the fixing skirt, in particular at the opening.

[0024] 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.

[0025] 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 located at an axial position corresponding substantially to that of said item.

[0026] By "joint with longitudinal section in the shape of an inverted U", it is here understood that the joint has in volume a general shape of an annular gutter, or of a torus centered on the longitudinal axis, the section of which through any plane containing the longitudinal axis has an inverted U shape. In the remainder of the application, and for the sake of clarity and conciseness, this joint with longitudinal section in the shape of an inverted U may be designated "inverted U-shaped joint".

[0027] Thanks to these provisions, the invention proposes a cosmetic product packaging assembly in which the sealing is maintained over time in the position in which the bottle is closed by the closing element and in which the functionality of the screwed assembly of the closing member on the neck of the bottle is preserved, despite the use of cellulosic material for producing the neck of the bottle and the potential geometric variations experienced in the presence of humidity.

[0028] Indeed, in the cosmetic product packaging assembly according to the invention, the inverted U-shaped seal overlapping the front face of the bottle makes it possible to limit any geometric variations of the neck when subjected to a humid atmosphere and to limit the phenomenon of twisting of the neck when the closure member is screwed onto it, by constituting a mechanical reinforcement of the neck at the opening, as well as local protection against the infiltration of humidity into the thickness of the neck.

[0029] Furthermore, when, in the position in which the bottle is closed by the closing member, the base of the inverted U-shaped seal is in contact with the plate and / or the radially outer wing of the inverted U-shaped seal is in contact with the radially inner surface of the fixing skirt, in particular at the opening, the inverted U-shaped seal overlapping the front face of the bottle makes it possible to compensate for any geometric variations in the neck by guaranteeing permanent contact with the part of the closing member with which it cooperates to ensure the sealing of the bottle in the closed position, thus improving the maintenance over time of the reliability of this sealing.

[0030] In the case where, in the position of closure of the bottle by the closure member, the base of the inverted U-shaped seal is in contact with the plate, a seal is ensured between the front face of the neck and the plate of the closure member by the axial intermediary of the base of the inverted U-shaped seal, the base of the inverted U-shaped seal being advantageously compressed in the axial direction between the front face of the neck of the bottle and the closure member tray.

[0031] Alternatively or additionally, in the case where, in the position of closure of the bottle by the closure member, the radially outer wing of the inverted U-shaped seal is in contact with the radially inner surface of the fixing skirt, a seal is ensured between the neck and the fixing skirt by the radial intermediary of the radially outer wing of the inverted U-shaped seal, the radially outer wing of the inverted U-shaped seal being advantageously compressed in the radial direction between the neck of the bottle and the radially inner surface of the fixing skirt of the closure member, in particular at the opening.

[0032] 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 mouth 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 oriented opposite the bottom of the bottle. Such a bottle neck structure has an advantage in terms of simplicity of manufacture.

[0033] In this embodiment, the front face of the neck is defined by the front wall of the neck and 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.

[0034] 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.

[0035] Thus, in this alternative embodiment, the front face of the neck, or the neck rim, defining the opening of the bottle, is formed by the base of the folded-down portion of the inverted U-shaped longitudinal section of the neck.

[0036] By "folded portion of longitudinal section in the shape of an inverted U of the neck", it is here 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 in particular initially oriented opposite the bottom of the bottle, has been folded, or in other words folded, curved, or directly intended to be folded, outwards in the radial direction and towards the bottom in the axial direction, so that the neck has at its opening a longitudinal section, that is to say a section through any plane containing the longitudinal axis, in the shape of an inverted U. The folded portion of the neck thus has in volume a general shape of an annular gutter, or of a torus centered on the longitudinal axis, the section of which through any plane containing the longitudinal axis has an inverted U shape. In the remainder of the application, and in the interest of clarity and conciseness, the folded portion of longitudinal section in the shape of an inverted U of the neck may be designated "folded portion in the shape of an inverted U of the neck" or "folded portion of the neck". Furthermore, the radially inner wing of the folded portion of the neck has a radially inner surface preferably located in the axial extension of the radially inner surface of the neck.

[0037] In this alternative embodiment, the wings of the inverted U-shaped seal are respectively in contact with the radially inner wing and the radially outer wing of the folded portion of the neck.

[0038] Thanks to the provisions of this alternative embodiment, the intrinsic rigidity of the neck of the bottle is reinforced at the opening, said neck having at the opening a double wall thickness formed by the radially inner and radially outer wings of the folded portion of the neck, connected by the base of the folded portion of the neck extending substantially in the radial direction. Thus, the maintenance of the geometry of the neck over time is further improved and the risk of torsional deformation of the neck when the closure member is screwed onto it is further reduced.Furthermore, in this alternative embodiment, when the bottle is in the closed position, the front face of the neck defined by the base of the folded portion of the neck is in contact with the plate of the closing member via the base of the inverted U-shaped seal, the inverted U-shaped structure in longitudinal section of the folded portion of the neck provides increased stability of the neck subjected to an axial force exerted by the plate of the closing member.

[0039] According to a first variant of this alternative embodiment, the radially inner wing and the radially outer wing of the folded 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, said neck having at the opening a double wall thickness formed by the radially inner and radially outer wings of the folded portion of the neck, in contact with each other in the radial direction and connected by the base of the folded portion of the neck extending substantially in the radial direction.

[0040] According to a second variant of this alternative embodiment, the radially inner wing and the radially outer wing of the folded portion of the neck provide a space between them in the radial direction.

[0041] In this latter variant, an elastic member, in particular a member 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.

[0042] Thanks to these arrangements, a certain elasticity in the radial direction is imparted to the neck between the wings of the folded portion of the neck.

[0043] In the case where, in the position of closure of the bottle by the closure member, the wing ra- outer surface of the inverted U-shaped seal is in contact with the radially inner surface of the fixing skirt, being advantageously compressed in the radial direction between the radially outer wing of the folded portion of the neck of the bottle and the radially inner surface of the fixing skirt of the closure member, in particular at the opening, such elasticity of the elastic member advantageously makes it possible to press and / or maintain the compression of the radially outer wing in the radial direction against the radially inner surface of the fixing skirt of the closure member, so that the sealing of the bottle in the closure position is maintained over time, despite possible geometric fluctuations of the neck, in particular in the radial direction.

[0044] According to a particularly advantageous arrangement, the closure member further comprises a radially inner stiffening skirt, erected from the plate and having a radially inner surface and a radially outer surface, and, in the bottle closure position, the neck is radially clamped, or in other words bordered on either side in the radial direction, between the fixing skirt and the stiffening skirt of the closure member, the radially inner wing of the inverted U-shaped seal preferably being in contact with the radially outer surface of the stiffening skirt, in particular at the opening.

[0045] Thanks to these arrangements, in the bottle's closure position, the neck is clamped, 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 geometry of the neck is maintained over time even further.

[0046] Furthermore, preferably, a seal is ensured and maintained over time despite possible geometric fluctuations of the neck, between the neck and the stiffening skirt by the radial intermediary of the radially inner wing of the inverted U-shaped seal, the radially inner wing of the inverted U-shaped seal being advantageously compressed in the radial direction between the neck of the bottle and the radially outer surface of the stiffening skirt of the closure member, in particular at the opening.

[0047] In the alternative embodiment, in which the neck has a folded-down portion, and in the variant in which 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, an elastic member being advantageously arranged between the wings of the folded-down portion of the neck, thanks to the aforementioned arrangements, it is ensured that in the bottle closure position, the radially outer wing of the inverted U-shaped seal is firmly pressed against the radially inner surface of the fastening skirt of the closure member and that the radially inner wing of the U-shaped seal inverted is firmly pressed against the radially outer surface of the stiffening skirt of the closure member, particularly at the opening. This further improves the maintenance of the geometry of the neck over time, as well as the reliability of the bottle's seal in the closure position.

[0048] Advantageously, in the bottle closure position, the radially outer surface of the stiffening skirt extends opposite, possibly being in contact with, the radially inner surface of the neck at least in the axial portion in which the external thread extends.

[0049] In other words, the external thread of the neck of the bottle extends over a given axial portion and, in the bottle's closure position, the radially external surface of the stiffening skirt of the closure member extends opposite, or even in contact with, the internal surface of the neck at least in this given axial portion.

[0050] Thanks to these provisions, the maintenance over time of the seal in the position of closure of the bottle by the closure element is improved and the functionality of the screwed assembly of the closure member on the neck of the bottle is preserved, despite the use of cellulosic material for the production of the neck of the bottle.

[0051] Indeed, thanks to the aforementioned provisions, the external thread of the neck of the bottle extending over a given axial portion, the stiffening skirt of the closure member is placed opposite, and possibly in contact, via its radially external surface, with 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 doing so, the geometry of the neck of the bottle can be maintained over time by its cooperation with the closure member and the sealing in the position of closure of the bottle by the closure member is thus made more reliable.

[0052] Furthermore, thanks to the provisions of the invention, the phenomenon of twisting of the neck of the bottle when the closure member is screwed onto it is limited, 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.

[0053] 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 a tightened insertion of the stiffening skirt into the neck and a tight assembly at the level of 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.

[0054] When the stiffening skirt is designed and dimensioned so that, in the bottle closure position, its radially outer surface is opposite 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 of the order of 0.5 mm. The play in the radial direction thus provided at this interface makes it possible in particular to limit the phenomena of radial conformation of the neck of the bottle following repeated associations with the closure member.

[0055] 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 zone facing or in contact with the radially inner 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.

[0056] Thus, in this particular embodiment, in the bottle's 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 arrangements are particularly advantageous in the case where the closure member also comprises a cellulosic material, as will be introduced later; in fact, in such a case, the stiffening skirt is also subject to variations in geometry over time and the fact of 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 properly fulfills the functions of maintaining the geometry of the neck and limiting the torsional deformation of the neck when the closure member is screwed onto it.

[0057] Alternatively or additionally, 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.

[0058] In this variant embodiment, the internal thread of the neck preferably extends in correspondence with the external thread, in the same axial portion, hollow 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 for example described in the aforementioned document CN115341415A.

[0059] Thanks to these arrangements, in the position in which the bottle is closed by the closing member, the neck is clamped between the internal thread of the fixing skirt and the external thread of the stiffening skirt, in the axial portion in which the external thread and, where appropriate, the internal thread extend, by the cooperation respectively of the internal thread of the fixing skirt with the external thread of the neck and of the external thread of the stiffening skirt with the internal thread of the neck. This further improves the maintenance of the geometry of the neck over time and minimizes the risk of torsional deformation of the neck when the closing member is screwed onto it.

[0060] As a variant, or possibly in addition to the sealing arrangements of the packaging assembly, the radially outer surface of the stiffening skirt or the radially inner surface of the fixing skirt has an annular groove partly housing an O-ring in sealing contact with the radially inner surface of the neck, respectively with the radially outer surface of the neck, in the bottle closure position.

[0061] 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 inserted 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.

[0062] Such arrangements may be particularly advantageous so that, in the bottle's closure position, the front face of the neck is not subjected to an axial force exerted by the closure member, which would be likely to alter its geometry.

[0063] According to an additional advantageous arrangement, the fixing skirt and the stiffening skirt of the closure member defining between them an annular space, the fixing skirt and / or the stiffening skirt have(s) a chamfer widening towards the outside of said annular space.

[0064] One or more such chamfers make it easier to introduce the front face of the neck of the bottle into the annular space of the closure member defined between the fixing skirt and the stiffening skirt.

[0065] Furthermore, in the 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 make it possible to progressively compress this sealing element when the bottle is closed by the member shutter.

[0066] According to an additional advantageous arrangement, whatever the embodiment or variant envisaged, the plate of the closure member has an axial recess defining an internal transverse partition and in which, in the bottle closure position, the internal transverse partition extends inside the neck, in particular at an axial position located opposite the opening or opposite the external thread.

[0067] Thanks to these provisions, the maintenance of the geometry of the neck over time and the reduction of the risk of torsional deformation of the neck when the closure member is screwed onto it are further improved, the internal transverse partition of the closure element extending in the radial direction forming a reinforcement for the neck in the bottle closure position, located in particular opposite axial zones of the bottle particularly subject to geometric variations in the presence of a humid atmosphere and / or to torsional deformation when the closure member is screwed onto the neck.

[0068] Generally speaking, whatever the embodiment or variant envisaged, the external thread of the neck, and where appropriate the internal thread of the neck, advantageously extends over at least one turn, and in particular over 1.5 turns, around the longitudinal axis.

[0069] Furthermore, always whatever the mode or the embodiment variant envisaged, the external thread of the neck, and where appropriate the internal thread of the neck, advantageously comprises a plurality of threads extending parallel in a helix along and around the longitudinal axis while 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 departures", so that the user can easily and ergonomically match the external thread, and where appropriate the internal thread of the neck of the bottle with the internal thread of the fixing skirt, and where appropriate with the external thread of the stiffening skirt, of the closure member.

[0070] Generally speaking, whatever the embodiment or variant envisaged, the closure member comprises a cellulosic material.

[0071] 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 channel, in particular without requiring a prior step of disassembling these elements.

[0072] Furthermore, all of the preceding provisions are all the more advantageous when the closure member comprises a cellulosic material to maintain the geometry over time of both the bottle and the closure member, and to limit torsional deformation of the neck of the bottle when the closure member is screwed onto it.

[0073] In particular, the cellulosic material included in at least the neck of the bottle, and preferably the entire bottle, and / or in the closure member comprises paper, cardboard, paper pulp, cardboard pulp, bamboo or a bamboo derivative or even bagasse, a fibrous residue from sugar cane, or a mixture of these materials.

[0074] Furthermore, according to a general arrangement, the bottle advantageously houses within it a cosmetic product, in particular a hygiene or care product for the body and / or hair, such as a shower gel, a shampoo, a conditioner, a mask for the body, the hair or other.

[0075] The invention further proposes a method for depositing a seal of longitudinal section in the shape of an inverted U overlapping the front face of the neck of a bottle belonging to the assembly as defined previously, comprising the steps consisting of: - provide a bath of joint constituent material in a fluid or pasty state, - provide a bottle belonging to the set as defined previously, - orient the bottle so that the front face of the neck is opposite the bath of seal material, with the longitudinal axis of the bottle oriented perpendicular to the surface of said bath, - immersing the front face of the neck of the bottle in the bath of seal material to a depth relative to the surface of the bath of seal material, by translating the bottle along the longitudinal axis in the direction of said bath, said depth corresponding to the axial height of the wings of the inverted U-shaped seal, - extract the front face of the neck of the bottle from the bath of seal material, by translating the bottle along the longitudinal axis away from said bath, - solidifying the seal constituent material, in particular by crosslinking, for example by means of ultraviolet rays, so that the base and the wings of the inverted U-shaped seal adopt a solid state and form the inverted U-shaped seal overlapping the front face of the neck of the bottle.

[0076] Such a deposition method is particularly advantageous due to its simplicity of implementation for obtaining an inverted U-shaped seal overlapping the front face of the bottle.

[0077] The material constituting the joint may, for example, be a polyurethane sealant, in particular a single-component one, such as the product Sikaflex®-221 marketed by the company SIKA®.

[0078] Furthermore, the machine used to immerse the front face of the neck of the bottle in the bath of joint constituent material and extracting it from this bath can for example be a dip coating machine marketed by the NADETACH® Company.

[0079] The invention may be better understood by reading the following description, accompanied by non-limiting examples of its implementation, with reference to the appended drawings, in which:

[0080] [Fig. 1] represents a perspective view of a cosmetic product packaging assembly according to the invention;

[0081] [Fig.2] is a longitudinal sectional view along plane P of [Fig.l];

[0082] [Fig.3] is an enlarged view of the detail circled in [Fig.2];

[0083] [Fig.4] is a view similar to that of [Fig.2], illustrating an alternative embodiment

[0084] [Fig.5] is an enlarged view of the detail circled in [Fig.4];

[0085] [Fig.6] is a longitudinal sectional view of the closure member of the assembly of packaging of a cosmetic product according to the invention, shown upside down, and illustrating a phase of depositing a seal within said closure member by means of a deposit cannula;

[0086] [Fig.7] is a view similar to those of Figures 3 and 5, illustrating in half section right an alternative embodiment of the seal between the closure member and the bottle of a cosmetic product packaging assembly;

[0087] [Fig.8] is a view similar to those of Figures 3, 5 and 7, illustrating a mode of rea alternative placement of the neck of the bottle belonging to a cosmetic product packaging set;

[0088] [Fig.9] is a view similar to those of 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;

[0089] [Fig. 10] illustrates in longitudinal section a phase of dipping the end of the neck defining the opening of the bottle in a seal bath making it possible to obtain an inverted U-shaped seal overlapping this end of the neck;

[0090] [Fig. 11] illustrates in longitudinal section a bottle neck whose end is provided with a U-shaped seal obtained after dipping in a seal bath;

[0091] [Fig. 12] illustrates in longitudinal section a phase of sealing the bottle obtained after soaking illustrated in [Fig. 10] by a sealing member;

[0092] [Fig. 13] is a view similar to those of Figures 3, 5, and 7 to 9, illustrating the bottle and the closure member of [Fig. 11], in the closure position;

[0093] [Fig. 14] is a view similar to those of figures 3, 5, 7 to 9 and 13, illustrating an alternative embodiment of the seal between the closure member and the bottle of a cosmetic product packaging assembly, in the embodiment al- alternative of the neck of the bottle;

[0094] [Fig. 15] is a view similar to those of figures 3, 5, 7 to 9 and 13, illustrating an alternative embodiment of the closure member.

[0095] In [Fig.l], a cosmetic product packaging assembly 1 according to the invention has been shown. Such an assembly comprises a bottle 2 extending along a longitudinal axis X and a closure member 3 adapted to selectively adopt a position for closing the bottle 2 and a position for releasing the bottle 2 allowing access to its contents and allowing its dispensing.

[0096] Such a bottle 2 may for example house within it a cosmetic product, in particular a hygiene or care product for the body and / or hair, such as a shower gel, a shampoo, a conditioner, a mask for the body, the hair or other.

[0097] 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.

[0098] Furthermore, and as appears 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 position for closing the opening O of the bottle 2 and a position for releasing the opening O of the bottle 2 allowing access to its contents and allowing its distribution through the opening O.

[0099] As visible in all of 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.

[0100] The radially outer surface 24 of the neck 21 is provided with an external thread 26, extending over a threaded axial portion PF, visible in particular in FIGS. 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.

[0101] 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.

[0102] At least the neck 21, and preferably the entire bottle 2, is made of a material comprising a cellulosic material. Such a cellulosic material comprises, 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.

[0103] The internal wall of the bottle 2 may possibly be provided with a coating made of a material impermeable to the cosmetic product received in the bottle 2.

[0104] 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 the bottom 20 of the bottle 2.

[0105] 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 of longitudinal section in the shape of an inverted U. The folded portion of the neck 21 has 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. 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 of longitudinal section in the shape of an inverted U of the neck 21.Furthermore, and as visible in these figures 8, 9 and 14, the radially inner wing 251 of the folded portion of the neck 21 has a radially inner surface preferably located in the axial extension of the radially inner surface 23 of the neck 21.

[0106] Thus, in these alternative embodiments, the neck 21 of the bottle 2 has a reinforcement at the opening O, making it possible to increase the intrinsic rigidity of the neck 21 of the bottle 2 in this area subject to phenomena of geometry fluctuations 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 even of conformation following repeated associations with a closure member, said neck 21 having at the opening O a double wall thickness formed by the radially inner 251 and radially outer 252 wings of the folded-down portion of the neck 21, connected by the base 250 of the folded-down portion of the neck 21 extending substantially in the radial direction.

[0107] As shown in Figures 2 to 9 and 12 to 15, the closure member 3 comprises a plate 30 adapted to close the opening O of the bottle 2 in the closed position. The closure member 3 further comprises a radially outer fixing skirt 31, raised from the plate 30 and having a radially inner surface 32 and a radially outer surface 33. The radially inner surface 32 of the fixing 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 closed position by the closure member 3.

[0108] In the illustrated embodiments, the closure member 3 is also made of a material comprising a cellulosic material. Such a cellulosic material comprises, 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.

[0109] The walls of the closure member 3 brought into contact with the cosmetic product may possibly be provided with a coating made of a material impermeable to the cosmetic product received within the bottle 2.

[0110] In the embodiments illustrated in Figures 2 to 9 and 12 to 14, the plate 30 of the closure member 3 is substantially flat and extends transversely to the longitudinal axis X of the bottle 2 in the closure position, above the opening O of the neck 21.

[0111] Alternatively, and as illustrated in [Fig. 15], the plate 30 of the closure member 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 threaded axial portion PF. The internal transverse partition 301 of the closure element 3 extending in the radial direction, it forms a reinforcement, a buttress, for the neck 21 in the position for closing the bottle 2, located in particular opposite axial zones of the bottle 2 particularly subject to geometric variations in the presence of a humid atmosphere and / or to torsional deformation when the closure member 3 is screwed onto the neck 21.

[0112] Furthermore, and still in relation to figures 2 to 9 and 12 to 15, the closure 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.

[0113] In the position of closure of the bottle 2 by the closure 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 either side in the radial direction, between the fixing skirt 31 and the stiffening skirt 35 of the closure member 3.

[0114] 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 of substantially tubular shape is radially clamped between the fixing skirt 31 and the stiffening skirt 35 of the closure member 3.

[0115] In the embodiments illustrated in Figures 2 to 5 and 15, in the closed position of the bottle 2, the radially outer surface 24 of the neck 21 is located opposite the radially inner surface 32 of the fixing skirt 31, the radial distance separating these surfaces preferably being less than 2 mm, better still less than 1 mm and for example of the order of 0.5 mm, in particular at the level of the opening O.

[0116] In the embodiments illustrated in Figures 7, 10 to 13, in the closed 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 by means of the radially outer wing 42'' of a seal of a longitudinal section 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 close to zero, or even negative, implying in the latter case a fixing with tightening 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. .

[0117] 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, in particular at the opening O, the radial distance separating these surfaces being close to zero, or even negative, implying in the latter case an insertion with tightening of the stiffening skirt 35 in 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 radially outer surface 37 of the stiffening skirt 35, in particular at the opening O.

[0118] 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 joint of longitudinal section 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 still less than 1 mm and for example of the order of 0.5 mm, in particular at the opening O.

[0119] In the 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.

[0120] In the 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 fixing skirt 31, in particular at the level of the opening O, possibly by means of the radially outer wing 42” of a joint of longitudinal section 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, implying in the latter case a fixing with tightening 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 of the radially outer wing 252 of the folded portion of the neck 21, in particular at the opening O.

[0121] In the alternative embodiments illustrated in Figures 8 and 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 by means of the radially inner wing 41” of a joint of longitudinal section in the shape of an inverted U 4' ' overlapping the front face of the neck defined by 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,involving in the latter case an insertion with tightening of the stiffening skirt 35 in the neck 21 and a tight assembly 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 opening O.,

[0122] 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.

[0123] 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.

[0124] In this alternative embodiment of [Fig.9], an elastic member 4'”, in particular a member 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 fixing skirt 31 of the closing member 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 member shutter 3, the elastic member is compressed in the radial direction. This ensures that in the closed position of the bottle 2, the radially outer wing 252 of the folded portion of the neck 21 is firmly pressed against the radially inner surface 32 of the fixing skirt 31 of the closing member 3 and that the radially inner wing 251 of the folded portion of the neck 21 is firmly pressed against the radially outer surface 37 of the stiffening skirt 35 of the closing member 3.

[0125] Furthermore, and as visible in the figures, the fixing skirt 31 and the stiffening skirt 35 of the closure member 3 define between them an annular space and the stiffening skirt 35 has a chamfer 39 widening towards the outside of said annular space. Such a chamfer 39 makes it easier to introduce the front face 25, 250 of the neck 21 of the bottle 2 into the annular space of the closure member 3 defined between the fixing skirt 31 and the stiffening skirt 35.

[0126] 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 position for closing the bottle 2.

[0127] Advantageously, in the position in which the bottle 2 is closed by the closing member 3, the radially external surface 37 of the stiffening skirt 35 extends at least opposite, or even in contact with, the radially internal surface 23 of the neck, at least in the threaded axial portion PF of the neck 21 in which the external thread 26 extends.

[0128] When the stiffening skirt 35 is designed and dimensioned so that, in the closed position of the bottle 2, 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, 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 a tightened insertion 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 threaded axial 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 closed position of the bottle 2, 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.

[0129] When the stiffening skirt 35 is designed and dimensioned so that, in the closed position of the bottle 2, the radially outer surface 37 is opposite the radially inner surface 23 of the neck 21, at least in the threaded axial portion PF, the radial distance separating these two surfaces 37, 23 in this axial portion is preferably less than 2 mm, better still less than 1 mm and by example of 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 closed position of the bottle 2, the radially outer surface 37 is located opposite the radially inner surface 23 of the neck 21, at least in the threaded axial portion PF.

[0130] Thus, whether the radially outer surface 37 is located in contact with or opposite, that is to say at a small radial distance, the radially inner 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 the closure member 3 is screwed into the position for closing the bottle 2, thus limiting the deformation, in particular torsional deformation, of the neck during this screwing operation.

[0131] According to a particular arrangement, and as visible in [Fig. 3], the neck 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 threaded axial portion PF. The stiffening skirt 35 has, at least in the area in contact with or facing the radially inner surface 23 of the neck 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 closure member 3. Advantageously, the second thickness e2 is greater than or equal to the first thickness e1, and in particular greater than or equal to 1.5 times the first thickness e1.

[0132] Thus, according to these arrangements, in the closed position of the bottle 2, the neck 21 of the bottle 2 is stiffened, in particular 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 closing member 3 of thickness e2 greater than that el of the neck 21 in this axial portion PF. Such arrangements are particularly advantageous in the case where the closing member 3 also comprises a cellulosic material.

[0133] 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 in correspondence with the external thread 26, in the same axial portion PF, in a hollow on the radially inner surface 23 of the neck 21. Such an internal thread 27 on the neck 21 may for example result from the manufacturing process of the bottle 2 and the formation of the external thread 26 of the neck 21, as for example described in the aforementioned document CN115341415A.

[0134] Thus, in the position in which the bottle 2 is 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.

[0135] 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 partly housing an O-ring 4'. This O-ring 4' arranged in the annular groove 370 is adapted to be placed in sealed contact with the radially inner surface 23 of the neck 21 in the position for closing the bottle 2.

[0136] In the embodiment of [Fig.7], the annular groove 370 and the O-ring 4' are placed on the stiffening skirt 35 at an axial position defined so as to be, in the position for closing the bottle 2, in contact 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 position for closing by the closing member 3, without the front face 25, 250 of the neck 21 being subjected to an axial force exerted by the closing member 3, which would be likely to alter its geometry.

[0137] 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 closing member 3, preferably by means of a seal 4, 4”, in particular a flat seal, fixed on the plate 30 of the closing 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.

[0138] 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 closure member 3 in the annular space defined between the fixing skirt 31 and the stiffening skirt 35.

[0139] Horn visible in [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 closure member 3, with its orifice for dispensing the seal constituent material placed opposite the inner surface of the plate 30. As a variant, such a seal could be manufactured in the form of an element separate from the closure member 3 and fixed therein, in particular on the inner surface of the plate 30, for example by gluing or by any appropriate means.

[0140] According to yet another particular arrangement, illustrated in figures 10 to 14, the bottle 2 is provided with a 4” seal of longitudinal section in the shape of an inverted U overlapping the front face 25, 250 of the neck 21. The 4” seal in the shape of an inverted U 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.

[0141] 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 seal 4” is in contact with the front wall 25 of the neck 21, the radially inner wing 41” of the inverted U-shaped seal 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 seal 4” is in contact with the radially outer surface 24 of the neck 21.

[0142] 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 seal 4'' is in contact with the base 250 of the folded-down portion of the neck 21, the radially inner wing 41” of the inverted U-shaped seal 4” is in contact with the radially inner surface of the radially inner wing 251 of the folded-down portion of the neck 21 and the radially outer wing 42'' of the inverted U-shaped seal 4” is in contact with the radially outer surface of the radially outer wing 252 of the folded-down portion of the neck 21.

[0143] Advantageously, and as illustrated in particular in Figures 13 and 14, in the position for closing the bottle 2, the base 40” of the inverted U-shaped seal 4” is in axial contact, in particular being compressed in the axial direction, against the plate 30 of the closing member 3, axial sealing of the bottle 2 by the closing member 3 thus being achieved. 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 seat 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, in the position for closing the bottle 2.

[0144] Alternatively or additionally, still as illustrated in Figures 13 and 14, in the closed position of the bottle 2, the radially inner wing 41” of the inverted U-shaped seal 4” is in radial contact, in particular being compressed in the radial direction, against the radially outer surface 37 of the stiffening skirt 35 of the closing member 3, a first radial seal of the bottle 2 by the closing member 3 thus being achieved.

[0145] Furthermore, still as a variant or in addition and always as illustrated in figures 13 and 14, in the position of closure of the bottle 2, the radially external wing 42” of the inverted U-shaped seal 4'' is in radial contact, in particular being compressed in the radial direction, against the radially inner surface 32 of the fixing skirt 31 of the closure member 3, a second radial seal of the bottle 2 by the closure member 3 being thus achieved.

[0146] When the bottle 2 is in the position of closure by the closure member 3, the axial seal, as well as the first and second radial seals are ensured, the seal of the bottle 2 by the closure member 3 is made reliable and maintained over time, despite possible geometric fluctuations of the neck.

[0147] Such an inverted U-shaped seal 4'' can advantageously be deposited on the one hand on the front face 25, 250 on the one hand 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 FIGS. 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-down portion of the neck 21 in the embodiment of [Fig. 14], by dipping in a bath of seal constituent material.

[0148] Thus, and as illustrated in Figures 10 and 11, in relation to the embodiment of Figures 12 and 13, a method of depositing a 4” seal of longitudinal section in the shape of an inverted U overlapping the front face, formed here by the front wall 25 of the neck 21 will be described.

[0149] In a first step of this process, a bath of joint constituent material M is provided in a fluid or pasty state. The joint constituent material M may, for example, be a polyurethane sealant, in particular a single-component one, such as the Sikaflex®-221 product marketed by the SIKA® Company.

[0150] In a second step of this method, a bottle is provided having one, the other or a combination of the characteristics described above.

[0151] 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],

[0152] A dipping is then carried out, an immersion of the front face 25 of the neck 21 of the bottle 2 in the bath of material constituting the seal M, by translational movement of the bottle according to the arrow F1 illustrated in [Fig.10], and of a depth relative to the surface of the bath of material constituting the seal M corresponding to the axial height that it is desired to obtain from the wings 41”, 42” of the inverted U-shaped seal 4”.

[0153] The front face 25 of the neck 21 is then extracted from the bath of seal material M, by translational movement of the bottle according to the arrow F2 illustrated in [Fig.l 1], away from this bath.

[0154] The tool used to immerse the front face of the neck of the bottle in the bath of material constituting the joint and extracting it from this bath can, for example, be a dip coating machine marketed by the NADETACH® Company.

[0155] A final step of solidification of the seal constituent material deposited on the neck 21 of the bottle 2 is then carried out. Such a solidification step can be carried out by simple drying in the open air. Alternatively, such a solidification step comprises an operation of crosslinking the seal constituent material deposited on the neck 21 of the bottle 2, in particular using ultraviolet rays.

[0156] Once the seal constituent material 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.

[0157] Thus, thanks to these different arrangements, taken in all technically possible combinations, the invention proposes a cosmetic product packaging assembly whose maintenance over time of the seal in the position of closure of the bottle by the closure element is improved and whose functionality of the screwed assembly of the closure member 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.

Claims

Claims

1. Assembly (1) for packaging a cosmetic product, 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 (0) and comprising a radially inner surface (23) and a radially outer surface (24) connected by a front wall (25), said radially outer surface (24) being provided with an external thread (26) extending over a threaded axial portion (PF); - a closure member (3) for the bottle (2) comprising a plate (30) adapted to close the opening (0) in the closure position of the bottle (2) and a radially external fixing skirt (31), raised from the plate (30) and having a radially internal surface (32) and a radially external surface (33),said radially inner surface (32) being provided with an internal thread (34) adapted to cooperate with the external thread (26) in the position for closing 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 bottle (2) is provided with a seal (4”) of longitudinal section in the shape of an inverted U 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 in which, in the position for closing the bottle (2) by the member shutter (3),the base (40”) of the inverted U-shaped seal (4”) is preferably in contact with the plate (30) and / or the radially outer wing (42”) of the inverted U-shaped seal (4”) is preferably in contact with the radially inner surface (32) of the fixing skirt (31), in particular at the opening (O).,

2. An assembly (1) according to claim 1, 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 seal (4”) are respectively in contact with the radially inner surface (23) and the radially outer surface (24) of the neck (21).

3. An assembly (1) according to claim 1, 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, so that the neck (21) has a folded-down portion of longitudinal section in the shape of an inverted U 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 in which the wings (41”, 42”) of the inverted U-shaped seal (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).

4. Assembly (1) according to claim 3, in which an elastic member (4”) is arranged between the wings (251, 252) defined by the folded-down portion of the neck (21).

5. Assembly (1) according to any one of claims 1 to 4, in which the closure member (3) further comprises a radially inner stiffening skirt (35), erected from the plate (30) and having a radially inner surface (36) and a radially outer surface (37), and in which, in the position for closing the bottle (2), the neck (21) is radially clamped between the fixing skirt (31) and the stiffening skirt (35) of the closure member (3), the radially inner wing (41”) of the inverted U-shaped seal (4”) preferably being in contact with the radially outer surface (37) of the stiffening skirt (35), in particular at the opening (0).

6. Assembly (1) according to claim 5, in which, in the closed position of the bottle (2), the radially outer surface (37) of the stiffening skirt (35) extends opposite, possibly being 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.

7. Assembly (1) according to any one of claims 5 and 6, in which the external thread (26) of the neck (21) extends over an axial portion in which the neck (21) has a first thickness (el), in which the stiffening skirt (35) of the closure member (3) has, at least in the zone in contact with the radially inner surface (23) of the neck (21) in the closure position of the bottle (2), 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).

8. Assembly (1) according to any one of claims 5 to 7, 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).

9. Assembly (1) according to any one of claims 5 to 8, in which 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) partly housing an O-ring (4') in sealed contact with the radially inner surface (23) of the neck (21), respectively with the radially outer surface (24) of the neck (21), in the position for closing the bottle (2).

10. Assembly (1) according to any one of claims 5 to 9, in which, the fixing skirt (31) and the stiffening skirt (35) of the closure member (3) defining between them an annular space, the fixing skirt (31) and / or the stiffening skirt (35) has(have) a chamfer (39) widening towards the outside of said annular space.

11. Assembly (1) according to any one of claims 1 to 10, in which the plate (30) of the closure member (3) has an axial recess (300) defining an internal transverse partition (301) and in which, in the closure position of the bottle (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).

12. Assembly (1) according to any one of claims 1 to 11, in which 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).

13. An assembly (1) according to any one of claims 1 to 12, wherein 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) while being angularly offset, and preferably uniformly distributed, around the longitudinal axis (X).

14. An assembly (1) according to any one of claims 1 to 13, wherein the closure member (3) comprises a cellulosic material.

15. Assembly (1) according to any one of claims 1 to 14, in which 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, a fibrous residue from sugar cane, or a mixture of these materials.

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

17. Method for depositing a seal (4”) of longitudinal section in the shape of an inverted U overlapping the front face (25, 250) of the neck (21) of a bottle (2) belonging to the assembly (1) according to any one of claims 1 to 16, comprising the steps of: - providing a bath of seal constituent material (M) in the fluid or pasty state, - providing a bottle (2) belonging to the assembly (1) according to any one of claims 1 to 16, - orienting the bottle (2) so that the front face (25, 250) of the neck (21) is opposite the bath of seal constituent material (M), with the longitudinal axis X of the bottle oriented perpendicular to the surface of said bath, - immersing the front face (25, 250) of the neck (21) of the bottle (2) in the bath of seal constituent material (M) to a depth by relative to the surface of the bath of seal material (M), by translation of the bottle (2) along the longitudinal axis (X) in the direction of said bath,said depth corresponding to the axial height of the wings (41”, 42”) of the inverted U-shaped seal (4”), - extracting the front face (25, 250) of the neck (21) of the bottle (2) from the bath of seal constituent material (M), by translating the bottle (2) along the longitudinal axis (X) away from said bath, - solidifying the seal constituent material, in particular by crosslinking, for example by means of ultraviolet rays, so that the base (40”) and the wings (41”, 42”) of the inverted U-shaped seal (4”) adopt a solid state and form the inverted U-shaped seal (4”) overlapping the front face (25, 250) of the neck (21) of the bottle (2).,

Images