EP2361199B1 - Cap with improved stopper - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

The invention relates to a cap to be fixed on a container neck, in particular on a bottle neck containing a liquid, particularly drinks. This type of plug allows easy closure and opening on the part of the user.

STATE OF THE PRIOR ART

This type of stopper generally comprises three main elements namely a pourer which is screwed on the neck of the bottle, a shutter member movable in translation and an optional protective cover. It is for the user to be able to move from a state (open for example) to another state (closed for example) in a simple way, by intervention of the mouth or one hand, with a further flow controlled liquid. Athletes in particular find here an interest in that they can drink while continuing their physical activity. Young children can favorably use containers equipped with such caps because their handling is very easy and the flow of liquid is controlled.

We know the document EP 1 065 150 A1 which discloses a cap of the type described above wherein the pourer comprises a coaxial cylindrical projection having a central opening; the cylindrical projection is covered over most of its height with a shutter element comprising two coaxial cylinders and a flow control means disposed on the axis of the stopper and provided with orifices for the passage of the liquid. The outer cylindrical wall of the projection comprises two annular protuberances which cooperate with an inner flange of the outer cylinder of the closure member; and the shutter member, which is movable in translation vis-à-vis the projection, can take the two conventional positions of opening and closing for the passage of the liquid. It is easily understood that on the one hand the user must exert a certain traction to open the shutter element because it must then overcome the force exerted on the abutment of one of the protuberances, and once this force is overcome, the shutter element can slide freely until it reaches the protrusion distal to the projection which serves as a stop. limit switch for the shutter. The user must exert a significant force at the opening; this peak early in the race is not welcome especially when we know that the main advantage and expected of this type of cap is easy opening.

We still know the demand WO 2006/053845 wherein the cylindrical projection comprises an outer wall of smaller section over a portion of its height which corresponds to the stroke of the closure member. Indeed in this area an inner flange of the shutter is in contact with the outer wall of the projection. In addition this plug has both a central passage and openings arranged in a circle for the liquid. The passage section is therefore quite important so that the thrust of the liquid on the walls of the shutter, possibly associated with excessive traction of the user may dissociate the shutter vis-à-vis the pourer of the cap; Unexpected and unexpected projection of liquid out of the bottle follows.

The document WO 2006/094415 shows a plug which differs from that previously described essentially by the profile of the outer wall of the projection: a coarse thread is provided according to this document, so that it is a rotation of the closure member vis-à-vis the plug pourer that allows to change the state of the plug. One does not meet here the main problem mentioned previously, namely the unexpected and uncontrolled opening of the stopper, but rather that of the difficulty to maneuver a part of the stopper.

In the document US 2004/129741 is described a cap to be fixed on a liquid container neck. comprising a pourer provided with a connection means with the neck surmounted by a tubular projection defining a reference axis of the plug, the tubular projection having an outer guide wall and a tubular wall defining a mouth to empty the container. and a tubular obturator externally covering the mouth of the pourer. The shutter comprises an outer guide skirt cooperating with the outer guide wall to guide the shutter in axial translation vis-à-vis the pourer between a closed position and an open position allowing the passage of liquid, a pierced bottom of one or more holes extending perpendicularly to the reference axis, the bottom having a plug portion without a hole, and a resilient annular sealing skirt protruding from the shutter portion of the bottom and in contact with the tubular wall of the tubular projection to form an annular seal. The outer wall of the tubular projection and the guide skirt of the shutter are shaped so as to slide relative to each other so that in a first opening phase from the closed position up to an intermediate position between the closed position and the open position the guide skirt slides on the outer wall with an axial friction resultant not exceeding a predetermined maximum value.

There are still known plugs whose tubular projection 1 and the shutter 2 have profiles as shown in section on the Figures 1A and 1B where the Figure 1A shows a closing position of the cap, and the Figure 1B a position of opening opening of the cap. In known manner the outer wall of the tubular projection 1 has in particular an annular groove 22 dug in said outer parol. Furthermore, a flange 15 on the inner wall of the shutter 2 ensures its guiding in translation vis-à-vis the tubular projection 1; a collar 21 forming axial stop is further provided at the distal end of the projection 1. Apart from the section at the annular groove 22, the outer section of the tubular projection 1 is constant.

With such a design, curves are obtained according to the figure 1C which show the variations of the axial forces as a function of the position of the shutter during its axial stroke relative to the annular projection 1. More precisely, three curves are represented on the figure 1C : the curve marked A relates to the axial tensile force (or resultant friction) of a skirt elastic ring (not shown) on a tubular wall (not shown) of the tubular projection 1. This effort is first constant (catch-up game), then decreasing to zero when there is no contact between this skirt and said tubular wall. The curve marked B is relative to the resultant axial friction between the outer wall of the tubular projection 1 and the inner wall of the shutter 2. There is a strong increase in this force at the beginning of opening, when it s' is to release the shutter 2 vis-à-vis the circumferential groove 22, then a slight decrease followed by a stabilization of the effort to a final increase related to the final snap. It should be noted that curve C, which is the "sum" of curves A and B, has a specific profile, with a sharp increase in the first phase of opening followed by an equally abrupt decrease; a stabilization phase is then observed over most of the race which ends with an increase followed by a fall in the axial force.

As already mentioned, this known concept is not satisfactory notably because a large tractive force is required at the beginning of the opening; in addition, there is not a uniform distribution of the tractive force throughout the axial stroke of the shutter 2 along the tubular projection 1; in fact, the user must first exercise a significant effort at the beginning of the opening, so that once the point of the race corresponding to the maximum effort is passed, the shutter is precipitated to the position opening, which is not satisfactory and requires a strengthening of the opening limit stop.

SUMMARY OF THE INVENTION

• un verseur pourvu d'un moyen de liaison avec le col surmonté d'une projection tubulaire définissant un axe de référence du bouchon, la projection tubulaire présentant une paroi extérieure de guidage et une paroi tubulaire délimitant une embouchure pour vider le récipient,
  et
• un obturateur tubulaire recouvrant extérieurement l'embouchure du verseur, l'obturateur comprenant :
  • une jupe extérieure de guidage coopérant avec la paroi extérieure de guidage pour guider l'obturateur en translation axiale vis-à-vis du verseur entre une position obturée et une position ouverte autorisant le passage du liquide,
  • un fond percé d'un ou plusieurs trous et s'étendant perpendiculairement à l'axe de référence, le fond comportant une partie obturatrice sans trou,
  • une jupe annulaire élastique d'étanchéité faisant saillie de la partie obturatrice du fond et au contact de la paroi tubulaire de la projection tubulaire pour former une étanchéité annulaire.

The invention aims to overcome the disadvantages of the state of the art and in particular to provide a plug that allows easy opening maneuver. To do this, it is proposed, according to a first aspect of the invention, a cap to be fixed on a liquid container neck, comprising:

• a spout provided with a connection means with the neck surmounted by a tubular projection defining a reference axis of the stopper, the tubular projection having an outer guide wall and a tubular wall delimiting a mouth to empty the container,
  and
• a tubular obturator externally covering the mouth of the pourer, the shutter comprising:
  • an outer guide skirt cooperating with the outer guide wall to guide the shutter in axial translation vis-à-vis the pourer between a closed position and an open position allowing the passage of liquid,
  • a bottom pierced with one or more holes and extending perpendicular to the reference axis, the bottom having a shutter portion without a hole,
  • a resilient annular sealing skirt protruding from the shutter portion of the bottom and in contact with the tubular wall of the tubular projection to form an annular seal.

According to the invention, the outer wall of the tubular projection and the guide skirt of the shutter are shaped so as to sliding relative to each other so that in a first opening phase from the closed position to an intermediate position between the closed position and the open position the guide skirt slides on the outer wall with an axial friction resultant not exceeding a predetermined maximum value F1, and that in a subsequent opening phase, the elastic annular skirt no longer in contact with the tubular wall, the axial resultant friction between the outer wall and the The guide skirt increases continuously up to a maximum value F 2 such that 10 N <F 2-F1 <20 N.

Thanks to this curve of friction forces, the user must increase his effort as and when opening. It follows a better cinematic opening, which is less impulsive. The arrival in the open position is less brutal, which avoids possible malfunctions at the end of the opening limit stop and allows a lighter dimensioning of the end stop.

Advantageously, during the subsequent opening phase, the shutter travels at least 50%, and preferably at least 60% of the stroke between the closed position and the open position. In addition, during the first opening phase, the shutter travels less than 20%, and preferably less than 15% of the stroke between the closed position and the open position. In other words, the subsequent opening phase constitutes the major part of the opening race.

In addition, during the first opening phase, the resultant of the frictional forces between the guide skirt and the outer wall increases from an initial value to the value F1 and then decreases to a value F1 'such that 2 <F1-F1 '<5N. This passage through the relative maximum value F1 constitutes a top dead center which indicates to the user the proximity of the closed position and can if necessary be accompanied by a slight click.

Moreover, in a final phase of opening, succeeding the subsequent phase of opening, the axial resultant of friction between the wall outside and the guide skirt decreases from the maximum value F2 to a value F3 such that there exists a difference (F3-F2) between 2 and 10 N. This passage through an absolute maximum F2 and the decrease of the effort in opening limit switches indicate to the user the proximity of the open position.

• On a également avantage à ce que la force F1 soit inférieure au maximum de la résultante des efforts de frottement d'étanchéité entre la jupe annulaire élastique d'étanchéité et la paroi tubulaire de la projection tubulaire. On a également avantage à ce que le maximum de la résultante des efforts de frottement d'étanchéité entre la jupe annulaire élastique d'étanchéité et la paroi tubulaire de la projection tubulaire soit inférieur à 15N, et plus avantageusement inférieure à 10N. Dans tous les cas de figures, on a avantage à ce que la valeur de la force F1 soit inférieure à 15N, et plus avantageusement inférieure à 10N. Ces dispositions permette un début d'ouverture avec un effort faible, de sorte que l'on peut avoir dans la phase ultérieure d'ouverture un accroissement sensible de l'effort jusqu'à une valeur F2 qui ne soit pas trop élevée.

It is advantageous that the force F2, which also corresponds to the maximum force to be printed on the shutter, remains less than 30 N, and preferably less than 25 N, and preferably less than 20 N. opening can be obtained with one hand or with the mouth without difficulty.

• It is also advantageous for the force F1 to be less than the maximum of the resultant of the sealing frictional forces between the elastic annular sealing skirt and the tubular wall of the tubular projection. It is also advantageous if the maximum of the resultant of the sealing frictional forces between the elastic annular sealing skirt and the tubular wall of the tubular projection is less than 15N, and more preferably less than 10N. In all cases, it is advantageous for the value of the force F1 to be less than 15 N, and more advantageously less than 10 N. These arrangements allow a beginning of opening with a low effort, so that we can have in the subsequent phase of opening a significant increase in effort to a value F2 which is not too high.

According to a preferred embodiment, the outer wall of the tubular projection comprises a zone having an increasing section away from the base, and cooperating with the guide skirt in the subsequent opening phase.

More precisely, the zone of increasing cross-section preferably extends over at least 50%, and preferably at least 60%, of the translation travel of the shutter between the closed position and the open position.

These precise data come from numerous and varied tests, and they make it possible to reach the objectives previously identified in a reliable and -reproductible way.

Advantageously, the outer wall of the tubular projection further comprises a circumferential ratcheting groove located near its distal end, which cooperates with a flange of the shutter to form an opening stop. This snap gives the user a feeling of end of race

Interestingly, the cooperation between the flange and the groove creates a reduction in the resulting axial force of between 2 and 10 N.

More precisely, the circumferential groove has a height measured along the axis of the stopper of the order of 0.4 mm.

In addition, according to a preferred embodiment, the tubular wall of the pourer is turned radially inwardly, the sealing skirt penetrating in the closed position in the mouth of the pourer, in radial elastic contact with the tubular wall, the the holes being located radially outside the sealing skirt. This embodiment is particularly suitable for a distribution of the holes on a circle located radially outside the skirt. This gives a "shower" type flow. The sealing skirt may then have at its distal end an annular protuberance turned radially outwards and intended to reinforce the seal against the inner wall of the tubular projection.

The invention is however also applicable to a plug whose pourer has a tubular wall turned radially outwardly, the sealing skirt cap this tubular wall, with the event of a sealing bead protruding radially towards the inside in contact with the tubular wall. In this case, the hole or holes through the bottom of the shutter will be located radially inside the skirt.

Furthermore, the tubular projection advantageously has a distal wall which, in the closed position, obstructs the hole or holes of the shutter.

BRIEF DESCRIPTION OF THE FIGURES

• les figures 1 A et 1 B, une vue de coupe d'un bouchon selon un mode de réalisation connu, avec un obturateur dans deux positions différentes, déjà commentées ;
• la figure 1C montre plusieurs courbes donnant différentes forces de traction sur l'obturateur en fonction de la position de celui-ci relativement à la projection tubulaire, pour un bouchon selon les figures 1A et 1 B;
• la figure 2 illustre un mode de réalisation d'un bouchon selon l'invention, en position obturée;
• la figure 3 illustre un mode de réalisation d'un bouchon selon l'invention, en position ouverte ;
• les figures 4A à 4C sont des vues en coupe d'un bouchon selon un mode de réalisation de l'invention, avec l'obturateur dans trois positions différentes ;
• la figure 5 illustre plusieurs courbes donnant différentes forces de traction appliquées à l'obturateur, en fonction de la position de celui-ci relativement à la projection tubulaire, pour un bouchon selon l'invention.

Other features, details and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate:

• the Figures 1A and 1B , a sectional view of a cap according to a known embodiment, with a shutter in two different positions, already commented;
• the figure 1C shows several curves giving different tensile forces on the shutter according to the position of the shutter relative to the tubular projection, for a plug according to the Figures 1A and 1 B;
• the figure 2 illustrates an embodiment of a plug according to the invention, in the closed position;
• the figure 3 illustrates an embodiment of a plug according to the invention, in the open position;
• the Figures 4A to 4C are cross-sectional views of a plug according to one embodiment of the invention, with the shutter in three different positions;
• the figure 5 illustrates several curves giving different tensile forces applied to the shutter, depending on the position of the latter relative to the tubular projection, for a plug according to the invention.

For the sake of clarity, identical or similar elements are marked with identical reference signs throughout the figures.

DETAILED DESCRIPTION OF AN EMBODIMENT

On the figure 2 the main elements of a plug according to the invention can be seen in longitudinal section in the closed state. The pourer 100 of the plug is fixed for example by screwing its lower portion 110 on the neck of the container containing the liquid to be dispensed. Any other reversible connection means can be envisaged without departing from the scope of the invention.

The pourer 100 is surmounted by a tubular projection 1 of specific shape which will be described in more detail below; a tubular shutter 2 is disposed coaxially with the tubular projection 1 vis-à-vis which it is movable in axial translation. Moreover, the shutter 2 comprises, in known manner, an internal collar 15.

In addition, the shutter 2 comprises a circular bottom 3 provided with holes 4 arranged in a circle; the holes 4 are arranged vis-à-vis a distal wall of the tubular projection; in the closed position of the plug there is annular or substantially annular contact between these two elements, which contributes to the closure of the plug.

The shutter 2 comprises an elastic annular sealing skirt 5 integral with the bottom 3, which protrudes internally and which cooperates with an inner tubular wall 11 of the projection 1. In more detail the skirt 5 is elastic and has at its end distal an annular protuberance 6 (or olive) for reinforcing, in the closed position, the sealing vis-à-vis the inner cylindrical wall of the protuberance 1. The skirt 5 associated with the tubular wall 11 further reinforce the axial guidance of the shutter 2. They have substantially the same height measured along the axis of the plug.

Moreover in the open position as shown on the figure 3 , the respective axially distant positions of the skirt 5 and the inner wall 11 of the tubular projection 1 form a kind of baffle for the liquid, thus contributing to a regulation of the flow.

According to an advantageous characteristic of the invention, the outer wall 12 of the tubular projection 1 has a specific profile; the figure 3 , which illustrates the plug in the open position, more legibly shows this profile: starting from the base of the wall 12, it is first cylindrical of constant section, then it has a variable section profile with in particular a zone 13 of increasing section. This area is followed by a groove circumferential 14 serving as a snap for the shutter as will be explained in more detail below.

Indeed, a flange 15 provided on the inner wall of the shutter 2 is in permanent radial contact with the wall 12 of the projection 1.

The Figures 4A, 4B and 4C show the positions of the shutter 2 and the projection 1 respectively in the closed position, the opening start and the open position. In the closed position, the collar 15 is housed so as to have a very limited radial contact with the outer wall 12 of the tubular projection since the latter has a kind of groove vis-à-vis; at the beginning of opening ( Figure 4B ), the flange 15 is in contact with the beginning of the zone 13 of increasing section of the tubular projection 1; then the flange 15 is guided all along the zone 13, until it arrives ( figure 4C ) in contact with a circumferential ratcheting collar 14 formed near the distal end of the tubular projection 1.

It is very interesting to note that the axial tensile force measured throughout the displacement of the shutter 2 is as illustrated by the figure 5 . More specifically, the figure 5 comprises three curves: the curve A relates to the axial force due to the friction of the elastic annular skirt 5 against the tubular wall 11; this curve is identical to the curve A of the figure 1C . The curve B relates to the friction force between the guide skirt 20 and the outer wall 12 of the tubular projection 1. And the curve C is the resultant (or sum) of the two aforementioned forces.

It is advantageously found that during a first opening phase of the plug between the abscissa points O and A of the figure 5 , the curve B increases continuously between the beginning of the race and a point of ordinate F1 which corresponds to a maximum local value of effort in this phase of the race. The increase here is of the order of a few Newtons, for example from 2 to 4 N. Also in this first opening phase, the curve B decreases between the abscissa points A and B, here a few Newtons, indicating a decrease of the effort up to a value F1 ', here about 5N. Advantageously, the curve B, at the beginning of the race near the abscissa point O, lies below the curve A, which reflects lower friction forces at the outer guide surfaces than at the sealing. Then, because of the reduction of the sealing friction forces, the friction forces between the guide skirt 20 and the outer wall 12 become predominant, which results in a crossing of the two curves A and B. By force things, the sealing friction forces of the curve A cancel at the latest when the skirt 5 leaves the tubular wall 11, at the point of abscissa B. It is therefore found that the resultant force on the curve C at the point B is equal to F1 'which is, by construction, less than the maximum force F1 exerted on curve B at point A.

In a later phase of the race, when the skirt 5 is no longer in contact with the tubular wall 11, that is to say beyond the abscissa point B of the figure 5 the axial resultant (curve C, coinciding with curve B) increases continuously up to a maximum point of abscissa C and ordinate F2. Interestingly, the efforts involved are such that 10N <F2-F1 <20N

The tests carried out according to the invention made it possible to measure a maximum force F1 of the order of 7 N and a force F2 of approximately 20 N for a total stroke of approximately 4 mm, comprising approximately 0.4 mm between the points O and B (first phase of the race) and 0, 4 mm between points C and D (final phase of the race). The duration of the opening during these tests is of the order of a few seconds.

At the end of the stroke, that is to say between the abscissa points C and D, there is a relaxation of the tensile force, due to the snap in the groove 14. It is advantageously at this stage of the stroke a fall of the tensile force to be supplied, which is quite perceptible to the user; in addition, this effect can be accompanied by a slight noise (click) characteristic and audible to the user, indicating the end of the race of the shutter.

Furthermore, the latching thus produced contributes to sealing the plug in the open position.

Thus, one has a relatively well-distributed result and in any case one avoids at the beginning of the race a strong growth followed by a decrease as illustrated on the figure 1C of the prior art. It is also observed that the resulting axial force involved is much lower than that required according to the prior art; it reaches at most 20 N whereas in a known manner (cf. Figure 1 C) 35 N are needed.

Finally, the opening energy, which is measured by the surface area of the curve C, is generally smaller.

Thus, not only the parts of the cap are less stressed, but they are better solicited. In addition it is a lesser effort that is asked to the user when manipulating the cap.

The stroke of the shutter 2 is limited between the latching which has just been described and, for the closed position, by the axial contact of the bottom 3 with the distal end of the tubular projection 1.

It is the combined effects of the new and unexpected characteristics mentioned above that make it possible to obtain such advantageous effects.

The form and arrangements just described further allow the presence of a first tamper ring 50 located in the lower part of the pourer 1 to which it is connected, before the first use, by breakable bridges regularly spaced and separated by incisions.

Additionally, it can be provided a hood 55, visible in section on the figure 2 covering the shutter 2 and internally provided with clipping means cooperating with a groove of the tubular projection 1. In addition, there may be provided a second tamperproof ring 60 located in the lower part of the cover 55 to which it is connected, before the first use, by breakable bridges regularly spaced and separated by incisions.

Many variants are possible without departing from the scope of the invention.

Claims (15)

1. A cap to be secured on the neck of a container for liquids, including:

   - a spout (100) provided with linking means with the neck and topped by a tubular projection (1) defining a reference axis of the cap, the tubular projection having an outer guiding wall (12) and a tubular wall (11) delimiting a nozzle to empty the container, and

   - a tubular shutter (2) externally covering the nozzle of the spout, the shutter (2) comprising:

   - an external guiding skirt (20) cooperating with the outer guiding wall (12) to guide the shutter in axial translation with respect to the spout between a closed position and an open position allowing for the flow of liquid,

   - a top (3) formed with one or more holes (4) and extending perpendicularly to the reference axis, the top comprising a blocking portion without holes,

   - an elastic annular sealing skirt (5) protruding from the blocking portion of the top and in contact with the tubular wall (11) of the tubular projection (1) to form an annular seal,
   wherein the outer wall (12) of the tubular projection (1) and the guiding skirt (20) of the shutter are shaped so as to slide relative to each other so that in a first opening phase starting from the closed position up to an intermediate position between the closed position and the open position the guiding skirt (20) slides on the outer wall (12) with an axial resultant of friction not exceeding a predetermined maximum value F1, characterized in that, the outer wall (12) of the tubular projection (1) and the guiding skirt (20) of the shutter are shaped so as to in a subsequent opening phase, the elastic annular skirt (5) is not in contact with the tubular wall (11) anymore and the axial resultant of friction between the outer wall (12) and the guiding skirt (20) increases continuously up to a maximum value F2 such that 1ON < F2-F1 < 20N.
2. The cap according to claim 1, characterized in that during the subsequent opening phase, the shutter travels at least 50% and preferably at least 60% of the way between the closed position and the open position.
3. The cap according to any one of the preceding claims, characterized in that during the first opening phase, the shutter travels less than 20% and preferably less than 15% of the way between the closed position and the open position.
4. The cap according to any one of the preceding claims, characterized in that during the first opening phase, the resultant of the friction forces between the guiding skirt (20) and the outer wall (12) increases from an initial value up to the value F1 to then decrease to a value F1' such that 2<F1-F1'<5N.
5. The cap according to any one of the preceding claims, characterized in that, in an ultimate opening phase, following the subsequent opening phase, the axial resultant of friction between the outer wall (12) and the guiding skirt (20) decreases from the maximum value F2 to a value F3 such that there is a deviation (F3-F2) comprised between 2 and 10N.
6. The cap according to any one of the preceding claims, characterized in that the force F2 is lower than 30N, and preferably lower than 25N, and more preferably lower than 20N.
7. The cap according to any one of the preceding claims, characterized in that the force F1 is lower than the maximum of the resultant of the sealing frictional forces between the elastic annular sealing skirt and the tubular wall of the tubular projection, and preferably lower than 15N or lower than 10N.
8. The cap according to any one of the preceding claims, characterized in that the outer wall (12) of the tubular projection comprises an area (13) having a section that increases with increased distance from the base, and cooperating with the guiding skirt (20) in the subsequent opening phase.
9. The cap according to claim 6, characterized in that the area (13) of increasing section extends over at least 50% and preferably over at least 60% of the translation travel of the shutter between the closed position and the open position.
10. The cap according to any one of the preceding claims, characterized in that the outer wall (12) of the tubular projection further comprises a circumferential detent groove (14) located in the vicinity of its distal end, which cooperates with a flange (15) of the shutter to form an opening abutment.
11. The cap according to claim 8, characterized in that the cooperation between the flange (15) and the groove (14) creates a decrease of the resulting axial force comprised between 2 and 10 N.
12. The cap according to any one of the claims 8 or 9, characterized in that the circumferential groove has a height measured in the axis of the cap of about 0.4mm.
13. The cap according to any one of the preceding claims characterized in that the tubular wall (11) of the spout faces radially inwardly, the sealing skirt (5) penetrating in the closed position in the nozzle of the spout, having an elastic radial contact with the tubular wall, the hole or holes (4) being located radially outwards of the sealing skirt (5).
14. The cap according to claim 11, characterized in that the sealing skirt (5) has at its distal end an annular protrusion (6) facing radially outwardly for reinforcing the sealing against the inner wall of the tubular projection.
15. The cap according to any one of the preceding claims, characterized in that the tubular projection (1) has a distal wall which, in the closed position, blocks the hole or holes (4) of the shutter (2).

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