FR3044526A1 - METHOD FOR APPLYING COSMETIC LIQUID AND COSMETIC VIAL PLUG - Google Patents

Abstract

The invention relates to a cosmetic bottle cap, comprising a hollow end (4) having an outlet (6) for outward flow, structured so that: in a first configuration of the endpiece (4), the orifice (6) of the nozzle (4) is semi-open so that the liquid (5) of the bottle (1) flows drop by drop through the orifice (6) of the nozzle ( 4) when the bottle (1) is inverted, in a second configuration of the nozzle (4), the orifice (6) of the nozzle (4) is open so that the liquid (5) of the bottle (1) flows continuously through the orifice (6) of the mouthpiece (4) when the bottle (1) is turned over, characterized in that the first configuration is a configuration of the mouthpiece (4) at rest , the second configuration is a configuration of the nozzle (4) under stress, the passage of the configuration of the nozzle (4) at rest to the configuration of the nozzle (4) under stress is effected by the elastic deformation of 'at M oins part of the tip (4).

Description

METHOD FOR APPLYING COSMETIC LIQUID AND COSMETIC VIAL PLUG

FIELD OF THE INVENTION The invention relates to the field of cosmetic liquid application methods contained in a cosmetic bottle surmounted by a cap comprising a hollow end piece having a flow orifice of this cosmetic liquid towards the outside of the bottle, and the field of cosmetic bottle stoppers.

BACKGROUND OF THE INVENTION

More specifically, the field of the invention relates to cosmetic liquid application methods and cosmetic bottle caps, which have two different flow modes of the cosmetic liquid out of the bottle and two different configurations associated with the cosmetic bottle cap.

The two modes of flow of the cosmetic liquid are preferably flow modes of different flow rates, and advantageously a drip mode and a continuous flow mode.

According to a prior art, there is known a cosmetic vial cap through which the cosmetic liquid flows, which can have two configurations.

In a first configuration, the liquid of the flask drips through the orifice of the nozzle when the flask is turned over.

In a second configuration, the liquid of the flask flows continuously through the orifice of the nozzle when the flask is returned.

The passage between the first configuration and the second configuration, is by moving a rigid mechanical part, under the impulse of the user, between a first position and a second position.

The return of the second configuration to the first configuration, is by the displacement, in the opposite direction, of this rigid mechanical part, always under the impetus of the user, between the second position and the first position.

This rigid piece directly regulates the flow rate of the cosmetic liquid through the flow orifice of the nozzle. In its first position, this rigid part allows a low flow rate, obscuring part of the opening of the orifice. In its second position, this rigid part allows a higher flow rate, leaving free the entire opening of the orifice. The opening of the flow orifice is relatively large at rest, because its size then corresponds to the high flow rate.

The presence and the movement mechanism of this rigid part, make the entire plug relatively complex and expensive. In addition, the required operation of the user at each configuration change makes the use of this plug relatively tedious for the user of the cosmetic bottle.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a method for applying a cosmetic liquid and a cosmetic vial cap at least partially overcoming the aforementioned drawbacks.

More particularly, the invention aims to provide both a cosmetic liquid application method and a cosmetic bottle cap, which make the plug more simple in its structure and less costly in its cost price and / or the process application of the cosmetic liquid by the use of this simpler cap for the user of the cosmetic bottle. The stopper is a cosmetic liquid dispensing stopper, allowing a flow of the cosmetic liquid through this stopper. This cap can be covered by a cap closing the dispenser cap and then preventing the cosmetic liquid from flowing out of the cosmetic bottle. To this end, the present invention proposes a method for applying a cosmetic liquid contained in a cosmetic bottle surmounted by a stopper comprising a hollow end piece having an outward flow orifice, comprising: in a first configuration of the mouthpiece , the orifice of the mouthpiece being semi-open, a step of drip of the cosmetic liquid through the orifice of the mouthpiece when the bottle is turned over, in a second configuration of the mouthpiece, the orifice of the nozzle being open, a step of continuous flow of the cosmetic liquid through the orifice of the nozzle when the bottle is turned, characterized in that: the first configuration is a configuration of the nozzle at rest, the second configuration is a configuration of the endpiece under stress, the transition from the configuration of the nozzle at rest to the configuration of the endpiece under stress is performed by the die elastic formation of at least a portion of the tip. To this end, the present invention also provides a cosmetic vial cap, comprising a hollow tip having an outflow port, structured so that: in a first configuration of the tip, the orifice of the tip is semi-open so that the liquid of the flask drips through the orifice of the tip when the flask is returned, in a second configuration of the tip, the orifice of the mouthpiece is opened so that the liquid of the bottle flows continuously through the mouth of the mouthpiece when the bottle is turned, characterized in that: the first configuration is a configuration of the mouthpiece at rest, the second configuration is a configuration of the nozzle under stress, the transition from the configuration of the nozzle at rest to the configuration of the nozzle under stress is effected by the elastic deformation of at least a portion of the mouthpiece.

The drip mode and the continuous mode of the stopper correspond mainly to a cosmetic liquid with an overall or mean viscosity of between 30 and 80 cP, this cosmetic liquid preferably comprising essentially one or more oils each having a viscosity preferably between 35 and 80.degree. and 70cP.

According to preferred embodiments, the invention comprises one or more of the following features which can be used separately or in partial combination with one another or in total combination with one another of the above-mentioned objects of the invention. .

Preferably, the passage of the configuration of the nozzle at rest to the configuration of the nozzle under stress is performed only by the elastic deformation of a portion of the nozzle. Thus, this configuration change is made in a simple, efficient and reproducible manner.

Preferably, the passage of the configuration of the nozzle at rest to the configuration of the nozzle under stress is effected by the elastic deformation of the orifice of the nozzle. This is the part of the tip most easily accessible in a simple manner, without requiring the presence of an additional piece integrated into the cap or without requiring a more complex gesture to act on another part of the tip that would be less accessible .

Preferably, the elastic deformation of the orifice of the nozzle is obtained by a pressure on the orifice of the nozzle exerted by the application surface during the application of the liquid contained in the bottle on this surface of application, for example by the skin of a user during the application of the liquid contained in the bottle on this skin. Thus, the configuration change is made more ergonomic, being integrated with the natural gesture of application of the cosmetic liquid on the application surface or on the skin, instead of requiring an additional gesture on the part of the user.

Preferably, the orifice of the tip comprises two lips, in the configuration of the nozzle at rest, the two lips remain close to one another, thus maintaining a reduced flow of liquid through the orifice of the when passing from the configuration of the nozzle to rest to the configuration of the nozzle under stress, the two lips move away from each other, thus increasing the flow of liquid through the orifice of the nozzle, in the configuration of the nozzle under stress, the two lips remain distant from each other, thus maintaining an increased flow of liquid through the orifice of the nozzle. The bringing together and spacing of the two lips of a pair of lips is a structurally simple and functionally effective embodiment for achieving a change between two very different flow modes, and this in a very simple manner at the level of the body. user.

Preferably, the initial section of the orifice of the nozzle, which widens during the transition from the configuration of the nozzle at rest to the configuration of the nozzle under stress, is greater than or equal to the section of a bottleneck located in the plug, which remains constant during the transition from the configuration of the nozzle at rest to the configuration of the nozzle under stress. Thus, the increase in the flow rate is not related to a simple increase in the size or diameter of the bottleneck located in the plug, which could be a little more difficult to achieve, but to an effect aspiration related to increasing the size or diameter of the orifice of the nozzle accelerating the passage of the cosmetic liquid through the bottleneck.

Preferably, the plug also comprises a flow channel terminated by the orifice of the nozzle, of substantially constant section over a given height, in the configuration of the tip at rest. Thus, the flow rate of the drip is more regular, regardless of the level of filling of the cosmetic liquid in the cosmetic bottle.

Preferably, the flow channel has, in the configuration of the nozzle under stress, a sectional enlargement on a height of between 25% and 75% of the given height, preferably on a height between 40% and 60%. % of the given height, more preferably on a height equal to half of the given height, the given height being preferably between 2mm and 30mm, the given height being even more preferably between 5mm and 15mm. It is this increase in the size or the diameter of the orifice of the nozzle on a sufficient height which will better accelerate the passage of the cosmetic liquid through the plug, thus creating a better suction effect.

Preferably, the orifice of the tip is of oblong shape, the two sides of the length constituting two lips able to move away from each other under the effect of an applied stress, substantially perpendicular to the flow axis at this tip port. Advantageously, the length of this oblong shape is between 2 and 4 mm and the width of this oblong shape is between 1 and 2 mm. The tip orifice may also have a circular shape for an equivalent surface. This surface is advantageously between 2mm2 and 6mm2.

Preferably, the orifice of the tip is extended by a contiguous slot over a given length, this slot opening under the effect of an applied stress, substantially perpendicular to the axis of flow, to this orifice of mouthpiece, the opening of this slot increasing the section of the flow orifice. The given length of this slot is advantageously between 3mm and 7mm, for example 5mm.

Preferably, the flow section of the orifice of the nozzle, in the configuration of the tip at rest, is between 2mm2 and 6mm2, preferably 4mm2. This range of flow sections allows a more even drip flow for the majority of the oils used for the composition of the cosmetic liquid. The viscosity range of these oils varies mainly between 35 and 70cP (cP = centipoise).

Preferably, in one of the vertical sectional planes of the plug, in the configuration of the nozzle at rest, the angle between the two walls of the nozzle is between 25 ° and 65 °, preferably 40 °. This angular range facilitates the flow, through the stopper, of an essentially oily cosmetic liquid, once the cosmetic bottle has been turned over, thereby avoiding the risk of partial retention of the cosmetic liquid by capillarity.

Preferably, in one of the vertical sectional planes of the stopper, the application surface of the orifice in configuration of the nozzle at rest, has an angle, with the mean plane of the bottom of the bottle, between 10 ° and 30 °, preferably 15 °. This angular range facilitates the flow, on the skin of a user, of an essentially oily cosmetic liquid, after the cosmetic bottle has been inverted, during a linear displacement of the bottle, for example along the arm of a user. . Indeed, the bottle, a little tilted, is more easily moved, without saccade, along the arm of the user, by the same user with a simple and natural gestures.

Preferably, the cap also comprises a hollow support intended to be secured to the neck of the bottle, the material of the support is more rigid than the material of the tip, and the tip is secured to the support. Thus, the rigid support provides strength to the cap, while the flexible tip provides deformation for changing the flow mode of the cosmetic liquid.

Preferably, the tip and the support are made simultaneously by bi-injection of their respective materials, the material of the tip being preferably an elastomeric thermoplastic material. Thus, the tip remains flexible while the tip assembly and support thus formed remains robust for a long time, while requiring only a single manufacturing step instead of several steps in the case of a successive assembly of the support and then of the mouthpiece.

Preferably, the stopper also comprises a flow channel terminated by the mouth of the mouthpiece, a protective cover coming to cover the mouthpiece so as to close the stopper in a sealed manner, preferably comprising a stopper sealing pin the flow channel. Thus, once the protective cover closed, the cosmetic bottle remains sealed and the cosmetic liquid, mainly based on oil (s), is not likely to leak, even if the bottle is horizontal or returned.

In a first preferred embodiment, the shape of the orifice of the nozzle is oblong. The oblong shape of the tip orifice makes it possible to improve the flexibility of the orifice, and in particular the flexibility of the lips, which becomes very good, which makes it easy to switch from the trickle mode to continuous flow.

In a second preferred embodiment, the shape of the orifice of the nozzle is round. The round shape of the tip orifice improves the seal when the cover is closed.

Preferably, the bottle is made of a material that is more rigid than the tip, and is, if necessary, made of a material that is more rigid than the support, and is preferably made of glass.

The support is for example hard plastic, while the tip is soft plastic or rubber. For example the support will be HDPE (high density polyethylene) or PP (polypropylene). For example, the tip will be made of TPE (thermoplastic elastomer), in particular from the family of block copolymers such as, for example, TPA (thermoplastic copolyamide), TPU (thermoplastic elastomer polyurethane), or EPDM (ethylene-propylene-diene monomer). ), or the family of mechanical mixtures of a thermoplastic polymer and an elastomer such as TPV (vulcanized thermoplastic), TPS (thermoplastic elastomer based on styrenic block copolymers), SEBS (polystyrene-b-polybutadiene) -b-polystyrene), or SB S (polystyrene-b-poly (ethylene-butylene) -b-polystyrene). The hardness of this thermoplastic elastomer material will advantageously be between 30 and 90 Shore A, for example about 60 Shore A. The material of the tip may also be LDPE (low density polyethylene) or PETBD (very low density polyethylene). or metallocene PE (polyethylene).

Preferably, the liquid contained in the bottle mainly comprises oil, in fact predominantly one or more oils. This oil or these oils have a viscosity preferably between 35 and 70 cP. This oil or these oils are advantageously vegetable oils. Other features and advantages of the invention will appear on reading the following description of a preferred embodiment of the invention, given by way of example and with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically represents an example of a cap mounted on a bottle, in a set bottle position, according to one embodiment of the invention.

FIG. 2 diagrammatically represents an example of use of the cap mounted on a bottle, in the upside-down bottle position, the plug end being at rest, according to one embodiment of the invention.

Figure 3 schematically shows an example of use of the cap mounted on a bottle, in the inverted flask position, the tip of the cap being under stress, according to one embodiment of the invention.

Figure 4 schematically shows an example of tip shape of the cap mounted on a bottle, according to one embodiment of the invention.

Figure 5 shows schematically another example of tip shape of the cap mounted on a bottle, according to one embodiment of the invention.

FIG. 6 schematically represents an example of an internal structure of the plug, according to one embodiment of the invention.

FIG. 7 represents, in rear view, an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

FIG. 8 shows, in side view, an example of a tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

FIG. 9 is an exploded perspective view of an example of a tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

FIG. 10 shows, in sectional view, in the closed hood position, the detail of an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

FIG. 11 shows, in sectional view, in the open hood position, the detail of an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

FIG. 12 represents, in front view, in the open hood position, the detail of an example of a plug end orifice shape which incorporates a slot and which is mounted on a bottle, according to a preferred embodiment of FIG. the invention.

DETAILED DESCRIPTION OF THE INVENTION

Throughout the rest of the description, as in all the above, when a user is mentioned, it is indifferently a woman or a man.

FIG. 1 schematically represents an example of a cap mounted on a bottle, in a set bottle position, according to one embodiment of the invention.

A bottle 1 contains a cosmetic liquid 5 based on oil. The bottle 1 is for example glass. On the bottle 1 is fixed a support 3 of rigid plastic. On the support 3 is assembled or overmoulded a tip 4 of flexible plastic or rubber. The tip 4 comprises a flow orifice 6 through which the cosmetic liquid 5 can flow out of the bottle 1. The entire support 3 and the tip 4, possibly closed by a cover not shown in this figure 1 is the plug 2 attached to the bottle 1. The bottle 1 is shown in a vertical position, standing, steadily placed on a table for example. The bottle 1 then rests on its bottom 10 which is substantially flat.

FIG. 2 diagrammatically represents an example of use of the cap mounted on a bottle, in the upside-down bottle position, the plug end being at rest, according to one embodiment of the invention.

When a user takes control of the bottle 1, and returns it, after having removed the cover (not shown in FIG. 1) which covered the stopper 2, the flow orifice 6 is free, and at rest in a state semi-open. Consequently, the oil-based cosmetic liquid contained in the bottle 1, passes through the support 3, passes through the nozzle 4, to flow outside the bottle 1, through the flow orifice 6 . Since the flow orifice 6 is in a semi-open state, the flow rate is reduced and corresponds to a trickle flow, given the relatively high viscosity of the oil at the base of the cosmetic liquid. 5. This trickle flow of the cosmetic liquid 5 allows a very accurate dosage, usually corresponding to a care for the user's face.

Figure 3 schematically shows an example of use of the cap mounted on a bottle, in the inverted flask position, the tip of the cap being under stress, according to one embodiment of the invention.

When a user takes control of the bottle 1, and returns it, after having removed the cover (not shown in FIG. 1) which covered the stopper 2, the flow orifice 6 is free. The user applies the bottle 1, and more specifically the tip 4, and even more precisely the flow orifice 6 on the skin 7 either of itself or of another user. The support of the flow orifice 6 on the skin 7 of the user exerts a constraint on this flow orifice 6, this stress increasing the opening of this flow orifice 6 which passes from a semi-open state at rest, in an open state under stress.

The cosmetic liquid 5 containing oil, contained in the bottle 1, passes through the support 3, passes through the nozzle 4, to flow outside the bottle 1, through the orifice 6 of flow. The flow orifice 6 being in an open state, the flow rate is greater, and corresponds to a continuous flow, on the surface of the skin 7 of the user, following the displacement of the bottle 1 the along the user's corresponding limb, for example along an arm or a leg of the user, despite the relatively high viscosity of the oil at the base of the cosmetic liquid 5. This continuous flow on the skin 7 of the user of the cosmetic liquid 5 allows an abundant dosage, usually corresponding to a care for the body of the user.

A simple release of the constraint exerted on the flow orifice 6 by ceasing to press it on the skin 7 of the user will allow the flow orifice 6 to return to its rest position, in a semi-closed state. -open. The application surface of the cosmetic liquid 5 may be different from the skin 7 of the user. Indeed the cosmetic liquid 5 can be applied first to an application medium, such as a cotton or fabric, to be then applied to the skin of the user through this application medium.

Figure 4 schematically shows an example of tip shape of the cap mounted on a bottle, according to one embodiment of the invention.

In the plane of Figure 4, the tip 4 has a substantially asymmetrical shape, its left side being almost vertical while its right side is noticeably inclined relative to the vertical. The average angle between the walls 43 of the nozzle 4 is about 40 degrees. The application surface 12 of the nozzle 4 is noticeably inclined relative to the horizontal, it has a pronounced angle of about 30 degrees with the substantially flat bottom 10 of the bottle 1. To the left end of the surface of the 12 is the flow orifice 6.

Figure 5 shows schematically another example of tip shape of the cap mounted on a bottle, according to one embodiment of the invention.

In the plane of Figure 5, the tip 4 has a substantially symmetrical shape, its left side as its right side being moderately inclined relative to the vertical. The average angle between the walls 43 of the nozzle 4 is about 40 degrees. The application surface 12 of the nozzle 4 is moderately inclined relative to the horizontal, it has a moderate angle of about 15 degrees with the substantially flat bottom 10 of the bottle 1. To the left end of the surface of the 12 is the flow orifice 6.

FIG. 6 schematically represents an example of an internal structure of the plug, according to one embodiment of the invention.

The bottle 1, in its upper part, terminates in a neck 8 which is equipped on its outer surface with a screw thread 80 on which is screwed the complementary screwing step 30 disposed on the inner surface of the support 3 of the cap 2.

The support 3 in its intermediate portion has a narrowing on the outer surface of which are disposed splines 31 on which are clipped complementary splines 91 disposed on the inner surface of a cap 9 for closing and protecting the plug 2. The flutes 31 can also be replaced by a continuous ring. The complementary grooves 91 may also be replaced by other types of protuberances or by notches or by discontinuous reliefs.

Between the support 3 and the cover 9 is located a tip 4 which is fitted in the upper part of the support 3 and which is retained in the support 3 by the cooperation between an annular protuberance 42 of the nozzle 4 and an annular recession 32 of the support 3. The orifice 6 of flow of the tip 4 is closed by a pin 90 sealing the cover 9 which enters the upper part 34 of the support 3. Through the support 3 and the tip 4, there is a flow channel 13 terminated by the flow orifice 6.

Between the support 3 and the neck 8 of the bottle 1, at the narrowing of the support 3, is disposed an annular seal 11. This annular seal 11 is for example a rubber washer.

FIG. 7 represents, in rear view, an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

The bottle 1 is standing, seen from the rear, a cover 9 covering the tip 4 and resting on the support 3. The cosmetic liquid can not flow out of the bottle 1 even if it is returned. The cover 9 has a height of 21.6 mm, for a diameter of 17.8 mm. The base of the support 3 has a height of 16.1mm for a diameter of 23.1mm The total height of the plug 2 is 37.7mm, including cap 9. The total height of the bottle is 125.9mm, cap 2 included.

FIG. 8 shows, in side view, an example of a tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

The bottle 1 is upright, seen from the side, the cover 9 having been removed, the tip 4 surmounting the support 3. The cosmetic liquid can flow out of the bottle 1 as soon as it is returned. The tip 4 has a height of 19.4mm. The height of the cap 2 is 35.5mm, cover 9 not included.

FIG. 9 is an exploded perspective view of an example of a tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention. The tip 4 is overmolded on the upper part 34 of the support 3 which overcomes the base 33 of the support 3. At the top of the upper part 34 of the support 3 is the application surface 12 of the tip 4. The stack is the next. On the thread 80 of the neck 8 of the bottle 1 is screwed the support 3 enclosing the seal 11 between the support 3 and the neck 8. In the upper part 34 of the support 3 is overmolded the tip 4. The tip 4 and that the upper part 34 of the support 3 are covered by the cover 9.

FIG. 10 shows, in sectional view, in the closed hood position, the detail of an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention.

On the thread 80 of the neck 8 of the bottle 1 is screwed the additional screw thread 30 of the base 33 of the support 3, then enclosing the seal 11 between the support 3 and the neck 8. In the upper part 34 of the support 3 The tip 4 is surmounted by the application surface 12 in which the orifice 6 of flow is placed. The flow orifice 6 is plugged by the sealing pin 90 of the cover 9 thus preventing the cosmetic liquid from flowing out of the vial 1 when it is turned over. Through the support 3 and the nozzle 4, there is a flow channel 13 terminated by the orifice 6 of flow. Three hooks 91 of the cover 9, radially evenly distributed around the cover 9, allow the cover 9 to be clipped onto the support 3, cooperating with the annular protuberance 31 of the support 3.

The outer diameter of the gasket 11 is 18mm. The inside diameter of the base 33 of the support 3 is 18 mm, not including screw 30. The inside diameter of the neck 8 of the bottle 1 is 12.6 mm.

FIG. 11 shows, in sectional view, in the open hood position, the detail of an example of the tip shape of the cap mounted on a bottle, according to a preferred embodiment of the invention. The flow orifice 6 is no longer plugged by the sealing pin 90 of the cover 9, the cosmetic liquid can now flow out of the bottle 1 when it is returned. Through the support 3 and the nozzle 4, there is a flow channel 13 terminated by the orifice 6 of flow.

The three latching notches 91 of the cover 9, radially distributed around the cover 9, no longer cooperate with the annular protuberance 31 of the support 3, the cover 9 having been released from the support 3.

Of course, the present invention is not limited to the examples and to the embodiment described and shown, but it is capable of numerous variants accessible to those skilled in the art.

FIG. 12 represents, in front view, in the open hood position, the detail of an example of a plug end orifice shape which incorporates a slot and which is mounted on a bottle, according to a preferred embodiment of FIG. the invention. The orifice 6 of the nozzle 4 is extended by a slot 100 joined over a given length, this slot 100 opening under the effect of an applied stress, substantially perpendicular to the axis of flow, to this orifice 6 of mouthpiece 4, the opening of this slot 100 increasing the section of the flow orifice. The given length of this slot is advantageously between 3mm and 7mm, for example 5mm. The slot 100 advantageously has an oblong shape, slightly V, with the tip of the V downwards, that is to say towards the inside of the tip 4. This V shape advantageously has a rounded fillet at the from the tip of the V.

Claims (12)

1) A method of applying a cosmetic liquid (5) contained in a cosmetic bottle (1) surmounted by a plug (2) comprising a hollow end (4) having an outwardly-flowing orifice (6), comprising in a first configuration of the nozzle (4), the orifice (6) of the nozzle (4) being semi-open, a step of drip of the cosmetic liquid (5) through the orifice ( 6) of the nozzle (4) when the bottle (1) is returned, in a second configuration of the nozzle (4), the orifice (6) of the nozzle being open, a continuous flow step of the cosmetic liquid (5) through the orifice (6) of the mouthpiece (4) when the bottle (1) is turned over, characterized in that: - the first configuration is a configuration of the mouthpiece (4) at rest the second configuration is a configuration of the endpiece (4) under stress, - the passage from the configuration of the endpiece (4) to rest at the configu tion of the endpiece (4) under stress is effected by the elastic deformation of at least a part of the endpiece (4). 2) Cosmetic vial stopper, comprising a hollow end (4) having an outlet (6) outwardly flow, structured so that: - in a first configuration of the tip (4), the orifice (6) of the nozzle (4) is semi-open so that the liquid (5) of the bottle (1) flows drop by drop through the orifice (6) of the nozzle (4) when the bottle (1) is inverted, - in a second configuration of the nozzle (4), the orifice (6) of the nozzle (4) is opened so that the liquid (5) of the bottle ( 1) flows continuously through the orifice (6) of the nozzle (4) when the bottle (1) is turned over, characterized in that: - the first configuration is a configuration of the tip (4) to rest, - the second configuration is a configuration of the nozzle (4) under stress, - the passage of the configuration of the nozzle (4) at rest to the configuration of the nozzle (4) under stress is performed by the of elastic formation of at least a portion of the tip (4). 3) Cosmetic vial cap according to claim 2, characterized in that the passage of the configuration of the tip (4) at rest to the configuration of the tip (4) under stress is performed only by the elastic deformation of part of the mouthpiece (4). 4) Cosmetic vial stopper according to claim 2 or 3, characterized in that the passage of the configuration of the tip (4) at rest to the configuration of the tip (4) under stress is performed by the elastic deformation of the orifice (6) of the nozzle (4). 5) Cosmetic bottle cap according to claim 4, characterized in that the elastic deformation of the orifice (6) of the tip (4) is obtained by a pressure on the orifice (6) of the tip (4). ) exerted by the application surface (12) during the application of the liquid (5) contained in the bottle (1) on this application surface (12), for example by the skin (7) of a user during the application of the liquid (5) contained in the bottle (1) on this skin. 6) Cosmetic bottle cap according to any one of claims 2 to 5, characterized in that: - the orifice (6) of the tip (4) comprises two lips, - in the configuration of the tip (4 ) at rest, the two lips remain close to each other, thus maintaining a reduced flow of liquid (5) through the orifice (6) of the nozzle (4), - during the passage of the configuration of the tip (4) at rest in the configuration of the nozzle (4) under stress, the two lips move away from each other, thereby increasing the flow of liquid (5) through the orifice (6 ) of the nozzle (4), in the configuration of the nozzle (4) under stress, the two lips remain distant from each other, thus maintaining an increased flow rate of liquid (5) through the orifice ( 6) of the tip (4). 7) Cosmetic bottle cap according to any one of claims 2 to 6, characterized in that the initial section of the orifice (6) of the tip (4), which widens during the passage of the configuration of the tip (4) at rest in the configuration of the nozzle (4) under stress, is greater than or equal to the section of a throat (8) of the throat located in the plug (2), which remains constant during from the passage of the configuration of the tip (4) at rest to the configuration of the tip (4) under stress. 8) cosmetic vial stopper according to any one of claims 2 to 7, characterized in that it also comprises a flow channel (13) terminated by the orifice (6) of the tip (4), section substantially constant over a given height, in the configuration of the tip (4) at rest. 9) cosmetic vial cap according to claim 8, characterized in that the flow channel (13) has, in the configuration of the nozzle (4) under stress, a sectional enlargement on a height of between 25% and 75% of the given height, preferably on a height between 40% and 60% of the given height, more preferably on a height equal to half of the given height, the height given being preferably between 2mm and 30mm , the given height being even more preferably between 5mm and 15mm. 10) Cosmetic bottle cap according to any one of claims 2 to 9, characterized in that the flow section of the orifice (6) of the nozzle (4), in the configuration of the tip (4). ) at rest, is between 2mm2 and 6mm2, preferably 4mm2. 11) Cosmetic bottle cap according to any one of claims 2 to 10, characterized in that, in one of the vertical sectional planes of the cap (2), in the configuration of the tip (4) at rest, the angle between the two walls (43) of the nozzle (4) is between 25 ° and 65 °, preferably 40 °. 12) Cosmetic vial stopper according to any one of claims 2 to 11, characterized in that in one of the vertical sectional planes of the stopper (2), the application surface (12) of the orifice (6) ) in the configuration of the tip (4) at rest, has an angle, with the mean plane of the bottom (10) of the bottle (1), between 10 ° and 30 °, preferably 15 °. 3) Cosmetic vial stopper according to any one of claims 2 to 12, characterized in that it comprises a support (3) hollow intended to be secured to the neck (8) of the bottle (1), in that the material the support (3) is more rigid than the material of the nozzle (4), and in that the tip (4) is secured to the support (3). 14) cosmetic vial cap according to claim 13, characterized in that the tip (4) and the support (3) are made simultaneously by bi-injection of their respective materials, the material of the tip (4) being of preferably an elastomeric thermoplastic material. 15) cosmetic vial cap according to any one of claims 2 to 14, characterized in that it also comprises: a flow channel (13) terminated by the orifice (6) of the tip (4), - A protective cover (9) covering the tip (4) so as to close the cap (2) sealingly, preferably comprising a sealing pin (90) plugging the flow channel (13). 16) Cosmetic vial cap according to any one of claims 2 to 15, characterized in that the orifice (6) of the tip (4) has an oblong shape. 17) Cosmetic vial cap according to any one of claims 2 to 15, characterized in that the orifice (6) of the tip (4) has a round shape. 18) cosmetic bottle comprising a cosmetic cap according to any one of claims 2 to 17, characterized in that the bottle (1) is made of a more rigid material than the tip (4), is optionally of more rigid material than the support (3) is preferably made of glass. 19) cosmetic bottle according to claim 18, characterized in that the liquid (5) contained in the bottle (1) comprises mainly oil.