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) and a retaining skirt (31) having an internal thread (34) adapted to cooperate with the external thread (26) in the closure position of the bottle (2), wherein the bottle is provided with a seal (4'') of inverted U-shaped longitudinal cross-section 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 wherein, 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 retaining skirt (31), in particular at the level of the opening (O). Figure for the abbreviation: Fig. 12.;

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 seals 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 closure element's retaining skirt 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 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 quantity of materials used and / or to replace them with more environmentally friendly materials and / or to 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 in the bottle. Thus, with such bottles, it has been observed, for example, that a neck, at The original 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 between the external thread of the bottle neck and the internal thread of the closure device's retaining skirt, whether during factory assembly of these elements after filling the bottle with cosmetic product, or during successive bottle closure operations performed 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 Ion- axis. gitudinal of the bottle, such deformation risks causing leaks in the bottle when closed by the closure device, or even difficulty and ultimately impossibility of screwing the closure 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 over 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 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, and in which, in the position of the bottle being closed by the closure device, the base of the inverted U-shaped seal is preferably in contact with the plate and / or the radially outer wing of the inverted U-shaped seal 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 being located at an axial position corresponding substantially to that of said item.

[0026] 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.

[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 inverted U-shaped seal overlapping the front face of the bottle makes it possible to limit any geometric variations of the neck subjected to a humid atmosphere and to limit the phenomenon of twisting of the neck when the sealing element is screwed onto it, by constituting a mechanical reinforcement of the neck at the level of the opening, as well as a local protection against the infiltration of moisture into the thickness of the neck.

[0029] Furthermore, when, in the bottle closure position by the closure device, 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 of the neck by ensuring permanent contact with the part of the closure device with which it cooperates to ensure the sealing of the bottle in the closure position, thus improving the maintenance over time of the reliability of this sealing.

[0030] In the case where, in the position of the bottle being closed by the closure device, the base of the inverted U-shaped seal is in contact with the tray, a seal is ensured between the front face of the neck and the tray of the closure device by means of the axial contact 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 tray of the obturator.

[0031] Alternatively or in addition, in the case where, in the position of the bottle being closed by the closing device, 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 means 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 closing device, 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 the neck opening, defining the bottle opening, is formed by the front wall of the neck connecting the radially inner surface and the radially outer surface oriented opposite to the bottom of the bottle. Such a bottle neck structure offers an advantage in terms of manufacturing simplicity.

[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 joint 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 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.

[0036] By "folded-down portion of the inverted U-shaped longitudinal section of the neck," it should be understood here 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 away from the bottom of the bottle, was folded down, or in other words, bent, curved, or directly folded down, outwards in the radial direction and towards the bottom in the axial direction, so that the neck presents, 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-down 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 the shape of an inverted U. In the remainder of the application, and in the interest of For clarity and conciseness, the folded-over portion of the inverted U-shaped longitudinal section of the neck may be designated 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.

[0037] In this alternative embodiment, 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-down portion of the neck.

[0038] Thanks to the features of this alternative embodiment, the intrinsic rigidity of the bottle neck is reinforced at the opening, the neck having a double wall thickness at the opening 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 long-term stability of the neck's geometry is further improved, and the risk of torsional deformation of the neck when the closure device is screwed onto it is further reduced.Furthermore, 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-down portion of the neck, is in contact with the tray of the closure device via the base of the inverted U-shaped seal. The inverted U-shaped structure in the longitudinal section of the folded-down portion of the neck provides increased stability of the neck subjected to an axial force exerted by the tray of the closure device.

[0039] According to a first variant of this alternative embodiment, the radially inner and radially outer wings 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 wings of the folded-down portion of the neck, in contact with each other in the radial direction and connected by the base of the folded-down 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-down portion of the neck provide a space between them in the radial direction.

[0041] In this latter variant, 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.

[0042] 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.

[0043] In the case where, in the position of the bottle being closed by the closing device, the wing ra- The outer radial wing of the inverted U-shaped seal is in contact with the inner radial surface of the fixing skirt, advantageously compressed in the radial direction between the outer radial wing of the folded portion of the bottle neck and the inner radial surface of the fixing skirt of the closure element, particularly at the opening. Such elasticity of the elastic element advantageously allows the compression of the outer radial wing in the radial direction to be pressed against the inner radial surface of the fixing skirt of the closure element, so that the seal of the bottle in the closure position is maintained over time, despite possible geometric fluctuations of the neck, particularly in the radial direction.

[0044] According to a particularly advantageous arrangement, the closure member further comprises a radially internal stiffening skirt, erected from the plate and having a radially internal surface and a radially external surface, and, 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 internal wing of the inverted U-shaped seal preferably being in contact with the radially external surface of the stiffening skirt, in particular at the opening.

[0045] Thanks to these arrangements, in the bottle 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 maintenance of the neck geometry over time is further reinforced.

[0046] Moreover, preferably, a seal is ensured and maintained over time despite possible geometric fluctuations of the neck, between the neck and the stiffening skirt by means 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-over portion, and in the variant in which the radially inner and radially outer wings of the folded-over portion of the neck have a space between them in the radial direction, an elastic element being advantageously arranged between the wings of the folded-over portion of the neck, by means of 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 closure element's retaining skirt and that the radially inner wing of the U-shaped seal The inverted section should be firmly pressed against the radially outer surface of the stiffening skirt of the closure device, particularly at the opening. This further improves the long-term stability of the neck geometry and the reliability of the bottle's seal when closed.

[0048] Advantageously, in the bottle closure position, the radially external surface of the stiffening skirt extends opposite, possibly in contact with, the radially internal 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 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 bottle closure position by the closure element is improved and 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 making of the neck of the bottle.

[0051] Indeed, thanks to the aforementioned arrangements, the external thread of the bottle neck extending over a given axial portion, the stiffening skirt of the closure element is positioned 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 this way, the geometry of the bottle neck can be maintained over time by its interaction with the closure element, and the seal in the bottle's closure position by the closure element is thus made more reliable.

[0052] 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.

[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 tight fit of the stiffening skirt in 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 aligned with the radially inner surface of the neck, at least in the axial portion containing the external thread, 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 radial deformation of the bottle neck following repeated contact with the closure device.

[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 area opposite 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 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.

[0057] 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.

[0058] 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 can, 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.

[0059] 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 respective 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. 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.

[0060] Alternatively, or possibly in addition to the sealing provisions 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 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.

[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 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.

[0062] 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.

[0063] According to a complementary advantageous arrangement, 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.

[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 obturation member defined between the fixing skirt and the stiffening skirt.

[0065] 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 member of obturator.

[0066] 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.

[0067] 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 bottle obturation position, located in particular in relation to axial areas of the bottle particularly prone to geometric variations in the presence of a humid atmosphere and / or to torsional deformation when the obturation device is screwed onto the neck.

[0068] 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.

[0069] 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.

[0070] Generally speaking, whatever the mode or variant of embodiment envisaged, the obturation 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 stream, in particular without requiring a prior step of disassembling these elements.

[0072] Moreover, all the preceding provisions are even more advantageous when the sealing device includes a cellulosic material to maintain the geometry over time of both the bottle and the sealing device, and to limit the torsional deformation of the bottle neck when the sealing device 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 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.

[0074] 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.

[0075] The invention further proposes a method for depositing a longitudinally cross-section seal in the shape of an inverted U overlapping the front face of the neck of a bottle belonging to the assembly as defined above, comprising the steps of: - to provide a bath of joint constituent material in a fluid or paste-like state, - provide a bottle belonging to the set as defined above, - orient the bottle so that the front face of the neck is facing the bath of sealant material, with the longitudinal axis of the bottle oriented perpendicular to the surface of said bath, - immerse the front face of the bottle neck in the sealing material bath to a depth relative to the surface of the sealing material bath, 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 bottle neck from the bath of sealant material, by sliding the bottle along the longitudinal axis away from said bath, - solidify the constituent material of the seal, in particular by cross-linking, for example by means of ultraviolet rays, so that the base and 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 process is particularly advantageous because of its simplicity of implementation to obtain an inverted U-shaped seal overlapping the front face of the bottle.

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

[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 (or “dip coating”) marketed by the NADETACH® Company.

[0079] 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:

[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.1];

[0082] [Fig.3] is an enlarged view of the detail circled on [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 on [Fig.4];

[0085] [Fig.6] is a longitudinal cross-sectional view of the obturator element of the assembly of 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;

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

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

[0088] [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;

[0089] [Fig. 10] illustrates in longitudinal section a phase of soaking the end of the neck defining the opening of the bottle in a sealing bath allowing 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 soaking in a sealant bath;

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

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

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

[0094] [Fig. 15] is a view similar to those in figures 3, 5, 7 to 9 and 13, illustrating a variant embodiment of the obturator organ.

[0095] 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.

[0096] 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.

[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 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.

[0099] 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.

[0100] 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.

[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 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.

[0103] The inner wall of the bottle 2 may optionally be provided with a coating made of a material that is impermeable to the cosmetic product received inside 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 to 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-over portion with an inverted U-shaped longitudinal cross-section. The folded-over 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-over 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] Alternatively, and as illustrated in [Fig. 15], the plate 30 of the closure 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 closure element 3 extending in the radial direction forms a reinforcement, a buttress, for the neck 21 in the closure position of the bottle 2, located in particular opposite axial areas of the bottle 2 that are particularly prone to geometric variations in the presence of a humid atmosphere and / or to torsional deformation when the closure element 3 is screwed onto the neck 21.

[0112] 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.

[0113] 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.

[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, which is substantially tubular in 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 opposite the radially inner 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 level of the opening O.

[0116] 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 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 clamping 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 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.

[0119] 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.

[0120] 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-down 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 through the radially outer wing 42” of a longitudinally cross-section 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, implying in the latter case a clamping attachment 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, 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,involving in the latter case an insertion with clamping 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 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 element is compressed in the radial direction. This ensures that, in the obturating 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 obturating element 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 obturating element 3.

[0125] 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.

[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 bottle 2 closure position.

[0127] Advantageously, in the position of the bottle 2 being 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 axial threaded 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 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, 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 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 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.

[0129] 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 threaded axial 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 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 bottle 2 closure position, the radially external surface 37 is opposite the radially internal surface 23 of the neck 21, at least in the threaded axial portion PF.

[0130] 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.

[0131] According to a particular arrangement, and as shown 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 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 neck 21 in the sealing 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 sealing 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, 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.

[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 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 there formation of the external thread 26 of the neck 21, as for example described in the aforementioned document CN115341415A.

[0134] 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.

[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 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.

[0136] 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 with the inner surface 23 of the neck 21 in the vicinity of the opening O when the bottle 2 is closed. This provides a seal in the radial direction of the bottle 2 in the closed position 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 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.

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

[0139] 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.

[0140] 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.

[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 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.

[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 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 portion of the neck 21, the radially inner wing 41” of the inverted U-shaped joint 4” is in contact with the radially inner surface of the radially inner wing 251 of the folded portion 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 of the radially outer wing 252 of the folded portion of the neck 21.

[0143] 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, being 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-over portion, is particularly advantageous, the base 250 and the wings 251, 252 of the folded-over 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.

[0144] 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.

[0145] Furthermore, as a further alternative or supplement 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.

[0146] 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.

[0147] 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.

[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” joint 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 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®.

[0150] In a second step of this process, 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 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 translational movement of the bottle 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”.

[0153] The front face 25 of the neck 21 is then extracted from the bath of seal constituent material M, by moving the bottle in translation along the arrow F2 illustrated on [Fig.1 1], away from this bath.

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

[0155] 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.

[0156] 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.

[0157] Thus, thanks to these different arrangements, taken in all technically possible combinations, 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.

Claims

Demands

1. 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 (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 bottle (2) closure member (3) 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), erected 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 bottle (2) closure position, wherein at least the neck (21) of the bottle (2), and preferably the entire bottle (2), comprises a cellulosic material, 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 bottle (2) closure position by the closure device (3),the base (40”) of the inverted U-shaped joint (4”) is preferably in contact with the plate (30) and / or the radially outer wing (42”) of the inverted U-shaped joint (4”) is preferably in contact with the radially inner surface (32) of the fastening skirt (31), in particular at the opening (O).

2. 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 joint (4”) are respectively in contact with the radially inner surface (23) and the radially outer surface (24) of the neck (21).

3. 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 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).

4. Assembly (1) according to claim 3, wherein an elastic element (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, wherein the closure member (3) further comprises a radially internal stiffening skirt (35) erected from the plate (30) and having a radially internal surface (36) and a radially external surface (37), and wherein, in the bottle closure position (2), the neck (21) is radially clamped between the fixing skirt (31) and the stiffening skirt (35) of the closure member (3), the radially internal wing (41”) of the inverted U-shaped seal (4”) preferably being in contact with the radially external surface (37) of the stiffening skirt (35), in particular at the opening (0).

6. Assembly (1) according to claim 5, wherein, in the bottle (2) closure position, the radially outer surface (37) of the stiffening skirt (35) extends opposite, possibly 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, wherein the external thread (26) of the neck (21) extends over an axial portion in which the neck (21) has a first thickness (el), wherein the stiffening skirt (35) of the closure member (3) has, at least in the area in contact with the radially inner surface (23) of the neck (21) in the bottle closure position (2), a second thickness (e2), and wherein 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, wherein 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 wherein 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 bottle closure position (2).

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

10. Assembly (1) according to any one of claims 5 to 9, 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.

11. Assembly (1) according to any one of claims 1 to 10, 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).

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

13. 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) being angularly offset, and preferably uniformly distributed, around the longitudinal axis (X).

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

15. Assembly (1) according to any one of claims 1 to 14, 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 sealing 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.

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

17. A method for depositing a seal (4”) with an inverted U-shaped longitudinal cross-section overlapping the front face (25, 250) of the neck (21) of a bottle (2) belonging to assembly (1) according to any one of claims 1 to 16, comprising the steps of: - providing a bath of seal material (M) in a fluid or paste-like state, - providing a bottle (2) belonging to 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 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 material (M) to a depth relative to the surface of the bath of seal constituent 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”), - extract 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, - solidify the seal constituent material, in particular by cross-linking, for example by means of ultraviolet rays, so that the base (40”) and the wings (41”, 42”) of the inverted U-shaped seal (4”) are in 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).,

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