CA2824874A1

CA2824874A1 - Closure assembly for a container

Info

Publication number: CA2824874A1
Application number: CA2824874A
Authority: CA
Inventors: Alexandre Rouquette; Lino Dreyer
Original assignee: Obrist Closures Switzerland GmbH
Current assignee: Obrist Closures Switzerland GmbH
Priority date: 2011-02-02
Filing date: 2012-01-16
Publication date: 2012-08-09
Also published as: KR20140004737A; BR112013018138A2; MA34846B1; CL2013002174A1; AU2012213661A1; TN2013000328A1; RU2013129459A; WO2012104134A1; IL227262A0; CO6791587A2; EP2484600A1; AR085112A1; MX2013008347A; US20130248530A1

Abstract

The present invention relates to a closure assembly comprising a closure spout (1) adapted to be fitted to the neck of a container and a closure cap. The closure spout (1) comprises a dispensing opening. The closure cap comprises an upper wall and a skirt depending therefrom, adapted to be fitted to the closure spout to close the container, especially for use on pressurized containers such as carbonated beverage containers. At least one substantially continuous second retaining arrangement (5) on said closure spout (1) has one ore more elongate second retaining segments (6). The lower second retaining surface (8) has no pitch or at least a relatively lower pitch in a first region (9), a relatively higher pitch in a second region (10) displaced from the first region (9) in an unscrewing direction (30) and has no pitch or at least a relatively lower pitch in a third region (11) displaced from said second region (10) in a unscrewing direction (30).

Description

CLOSURE ASSEMBLY FOR A CONTAINER
The present invention relates to a closure assembly according to the preamble of the independent claims. The assembly comprises a closure spout and a closure cap. The closure spot is adapted to be fitted to the neck of a container and comprises a dispensing opening. The closure cap comprises an upper wall and a skirt de-pending therefrom, adapted to be fitted to the closure spout to close the container, especially for use on pressurized contain-ers such as carbonated beverage containers.
In recent times the use of so-called sport caps has increased.
Sport caps differ from the more traditional so-called single caps in that they are adapted to provide a dispensing outlet for directly drinking off. Generally they have two areas of sealing:
i) between the closure and the container neck (similar as single caps have); and ii) between two or more parts of the closure.
The two parts of the closure may include, for example, a spout with an outlet or dispensing opening adapted to be used for di-rectly drinking off. Such sports caps permit people to have their beverages in an "on the go drinking" and especially an athlete, particularly a cyclist, to drink during sports activ-ity.
There is a desire to provide sport caps also for carbonated bev-erages, which need more demanding closures due to the internal pressure in the container. The internal pressure may become es-pecially high in the case of to sports caps, since a container being moved during a sports activity leads to an augmented de-gassing of the contained beverage.
Current commercially mass-produced carbonated beverage contain-ers use threads on the container and on the single-cap closure

2 of the continuous, helical type. The threads comprise a single, substantially continuous thread portion on the container neck with a low thread pitch angle, typically less than 500. The low pitch angle is needed in order to ensure that the closure does not unscrew spontaneously under pressure from inside the con-tainer. The low pitch of the helical threads also means that the closure typically needs to be rotated through more than 360 to disengage it completely from the container neck. Whilst this can be laborious, especially for weaker users such as elderly people or children, it also permits some gas venting to take place while the closure is being unscrewed, and thereby reduces the risk that the closure will blow off uncontrollably once unscrew-ing of the closure from the container neck has commenced. This gas venting is usually assisted by the provision of axial gas venting notches extending longitudinally through the helical threads.
EP0868358 proposes a neck and a single-cap closure which are constructed and arranged to provide a vent for venting gas from the container neck at least when the closure is in an intermedi-ate position. The closure comprises means for blocking or re-stricting rotation beyond the intermediate position when there is an axial pressure in a direction emerging from the container neck. These means are part of the screw thread as well of the container neck as of the closure. Thus the proposed solution can only be implemented for specifically adapted containers.
The arrangement described above generally are not suitable for the use with standard container filling apparatus using, for ex-ample, standard (PCO neck finish) PET bottles and standard pro-file closure caps which are screwed onto the bottles and removed therefrom by unscrewing and breaking a tamper evident ring.

3 It is the aim of the present invention to provide a solution which avoids the disadvantages of the prior art, which in par-ticular provides a sport cap also suitable for carbonated bever-ages and for which not necessarily a modification to industry standard bottles is required.
Accordingly, the invention provides a closure assembly compris-ing a closure spout adapted to be fitted to the neck of a con-tainer and a closure cap adapted to be fitted to the closure spout to close the container. The closure spout comprises a dis-pensing opening.
Preferably the closure spout has narrowed cylindrical neck with a smooth and slightly rounded lip to permit drinking directly from the container.
The closure cap comprises an upper wall and a skirt depending therefrom.
The closure cap has a first retaining arrangement comprising one or more elongate first retaining segments. Each first retaining segment has upper and lower first retaining surfaces.
In this context "upper" means directed away from the container when the assembly is applied to the container and "lower" means directed towards the container when the assembly is applied to the container.
The closure spout has at least one substantially continuous sec-ond retaining arrangement comprising one ore more elongate sec-ond retaining segments. Each second retaining segment also has upper and lower second retaining surfaces.

4 PCT/EP2012/050564 The lower second retaining surface has no pitch or at least a relatively lower pitch in a first region, a relatively higher pitch in a second region displaced from the first region in an unscrewing direction and no pitch or at least a relatively lower pitch in a third region displaced from said second region in a unscrewing direction.
As a matter of course the present invention shall be understood as also implying a closure assembly wherein the first retaining arrangement is on the closure spout and a substantially continu-ous second retaining arrangement is on the closure cap.
Since the pitch of the second retaining surface is different in three different regions there is a different axial interaction between the first and the second retaining elements in the dif-ferent regions. A lower pitch provides for a stronger axial in-teraction which may prevent a sudden unintentional removing of the closure cap in case there is internal pressure. On the other hand since there is also a region with a higher pitch, the rota-tion angle for opening the cap is smaller as compared with a low pitch thread.
The closure cap may be removed in a controlled way especially in a first opening phase, when for the first time gas may escape from the container and a third phase, just before the closure cap is completely unscrewed.
The closure spout may be adapted to fit to the container in any intended way, for example having s screw thread being suitable for standard container necks.
Preferably the second retaining arrangement comprises a lower stopping area adjacent to said first region which provides a stopping abutment surface. Correspondingly the first retaining arrangement comprises a corresponding lower abutment surface on at least one of said first segments, which abuts against said lower stopping area to block or restrict rotation of said clo-sure cap in the direction of screwing on (hereinafter screwing direction) to define or to support the fully secured position.
The contact between the lower abutment surface of the closure cap and the stopping abutment surface of the closure spout pre-vents the closure cap from being overtightened when applied to the closure spout. There is the risk that a cap which is over-tightened may not be removed from the closure spout in a con-trolled manner. Overtightening also bears the risk disengaging the retaining elements and thus the risk of a sudden blow off.
Additionally or alternatively the second retaining arrangement comprises an upper stopping area adjacent to said third region which provides a stopping abutment surface. Correspondingly the first retaining arrangement comprises a corresponding upper abutment surface on at least one of said first segments which abuts against the upper stopping area to block or restrict rota-tion of said closure cap in the screwing direction to define or to support the fully secured position. Such an upper area pro-vides for an even better protection against overtightening.
The stopping abutment surface may be part of the lower second retaining surface, may pass into the lower second retaining sur-face or may be a separate surface. The stopping abutment surface preferably tends to a rotational direction, more preferably the stopping abutment surface normal is perpendicular to the main axis of the closure assembly.

In a preferred embodiment of the invention said lower second re-taining surface further comprises a blocking step adjacent to said third region to provide a blocking abutment surface. The first retaining arrangement comprises a corresponding blocking abutment surface on at least one of said first segments which abuts against said blocking step to block or restrict rotation of said closure in an unscrewing direction at an intermediate position when said closure cap is under axial pressure in a di-rection emerging from the closure spout.
Preferably said closure spout and closure cap are constructed and arranged to provide a vent for venting gas from said con-tainer at least when said closure cap is in said intermediate position.
More preferably said closure spout and closure cap are con-structed and arranged to enable said step and said first retain-ing segments to be moved out of engagement by axial displacement of the closure cap downwardly, i.e. towards the container, on said closure spout at said intermediate position.
Such an arrangement is therefore responsive not only to internal pressure acting on the closure cap, but also to external pres-sure applied by the person unscrewing the closure cap.
The greater the internal pressure is, the bigger is the force needed to press down and the more difficult it is to unscrew the closure cap. Thus the arrangement is a safety feature.
The closure cap will be held at the intermediate position until the internal pressure has reduced to a low level at which the closure cap may be easily pressed downwards.

Further more, should the closure begin to spin uncontrollably when it is first unscrewed, the arrangement will act to hold the closure at the intermediate position until the pressure is re-duced.
Preferably at least a part of the lower surface and/or the stop-ping abutment surface in the first region of the second retain-ing segment forms a matching fit with at least a part of said upper surface and/or the corresponding abutment surface on one of said first retaining segments when the closure is fully se-cured on the container spout.
Additionally or alternatively at least a part of the lower sur-face and/or the stopping abutment surface in said third region of the second retaining segment forms a matching fit with at least a part of the upper surface and/or the corresponding abut-ment surface on one of said first retaining segments when the closure cap is fully secured on the closure spout.
Preferably at least a part of the lower surface of the second retaining segment in the third region forms a matching fit with at least a part of the upper surface of the first segment sur-face when the closure cap is at said intermediate position and outwardly displaced on said container spout The matching fit between parts of first and second retaining ar-rangements provides for a reliable contact area, securing the closure cap in axial and preferably also in rotational direc-tion.
In a favourable embodiment of the invention at least one of the first retaining segments comprises a back off cam arranged on the upper first retaining surface which abuts against a blocking step of the second retaining arrangement to block or restrict rotation of said closure in an unscrewing direction at the basi-cally fully secured position.
The back off cam provides for a resistance against simply start-ing to open the closure cap by turning it, especially in case there is an internal pressure.
In particular the back off cam may prevent a self-opening of the closure cap, for example during a transport of the container. An axial force from the inside of the container together with an accidental torque due to for example an external vibration would not be sufficient to open the closure cap.
The back off cam may be constructed and arranged so as to get over the restriction relatively easily when opening torque is applied by a user, especially in case the closure assembly com-prises further safety features as described above.
Preferentially the first retaining arrangement is constructed and arranged such that when the closure cap is fully secured on the closure spout the first retaining arrangement contacts both the first and third region of the second retaining arrangement to provide a holding force in axial direction.
The first retaining arrangement may comprise retaining segments having an adequate rotational length to contact both the first and third region of the second retaining arrangement. Alterna-tively the first retaining arrangement may comprise at least two axially displaced retaining segments whereof one contacts a first retaining region and a second one contacts a third retain-ing region in the fully secured position.

Since in the first and third regions of the second retaining ar-rangement the segments have no pitch or have at least a lower pitch than in the second region, the contact between the first retaining segments and the first and third regions of the second retaining arrangement, primarily provides for an axial holding force. The axial force is necessary to hold the closure cap at the closure spout, especially when an internal pressure arises due to degassing of the beverage.
Using both regions with no pitch increases the holding force.
In a preferred embodiment of the invention the first retaining arrangement comprises at least one retaining segment with both an upper abutment surface and a back off cam, preferably addi-tionally an upper surface which provides for an axial force to-wards the second retaining arrangement when the closure cap is in the fully secured position, preferably with no pitch.
Preferably the upper abutment surface is displaced in the un-screwing direction from the back off cam. The back off cam is arranged on the upper retaining surface. The upper abutment sur-faces may be formed as a continuation of the upper retaining surface, arranged at an angle to said upper retaining surface.
Thus one retaining segment may have multiple functionalities: it prevents unintended self-opening by the back off cam, it pro-vides for a defined fully secured position by the upper abutment surface and it may also provide for an axial holding force by a mainly horizontal upper retaining surface.
The closure spout is meant to remain fixed on the container when the closure assembly is opened and the closure cap is removed form the closure spout.

Moreover in order to allow a comfortable opening of the closure assembly the closure spout should be blocked from rotating with respect to the container. A torque applied to the closure assem-bly should only act on the closure cap.
Therefore the closure spout may be fixed to the container basi-cally inseparable, for example by a snap fit, an adhesive or a welded bond.
Advantageously the closure spout is adapted to be screwed on a container. Preferably the closure spout comprises anti-rotational elements, which block or prevent rotation of said closure spout in the unscrewing direction, when the closure spout is fully secured on the container. Preferably rotational elements may be formed as ribs adapted for interaction with venting slots and/or thread ends in a screw thread of a standard container neck.
With this solution the closure assembly may be used for standard container necks.
Preferably the first region extends for 50-400 about the circum-ference of the container spout and/or the second region extends for 20 -90 about the circumference of the container spout and/or the third region extends for 50-400 about the circumfer-ence of the container spout.
Favourably the pitch of the lower second retaining surface in the first region is in the range -5 to 10 and/or the pitch of the lower second retaining surface in the second region is in the range 5 to 25 and/or the pitch of the lower second retain-ing surface in the third region is in the range -5 to 10 .

Advantageously the pitch of the lower second retaining surface in the first region is equal or at least similar to the pitch of the lower second retaining surface in the third region.
Most preferably the lower second surface in the first and in the third region has no pitch. This provides for an optimal axial holding force and additionally prevents spontaneous opening.
Preferably the second region is adjacent to the first region and/or to the third region of the lower second retaining sur-face. More preferably at least one second retaining segment com-prises basically three sections, wherein the first sections cor-responds to the first region with no pitch or a lower pitch, the second section corresponds to the second region with a higher pitch and the third section corresponds to the third region with also no pitch or a lower pitch. There may additionally be a lower stopping area adjacent to the first region and an upper stopping area adjacent to the third region.
The closure assembly may further comprise means to form a seal between all container neck and the closure assembly when the closure cap is fully engaged on the closure spout. Preferably there are two areas of sealing, that is on the one hand between the closure spout and the container neck and on the other hand between the closure spout and the closure cap.
A rim of the neck of the closure spout may abut sealingly against the inside of the closure cap, in particular against one or more sealing lips of the closure cap.
Additionally or alternatively other seals may be formed between the container neck and the closure spout as well as between the closure spout and the closure cap, such as elastomer layers, in-terference fit seals, 0-ring seals or plug seals, the sealing means sealing against the inner, top or outer surface of the container neck or spout neck.
The closure assembly may further comprise a tamper-evident ring attached to the skirt portion of the closure cap. First unscrew-ing the closure cap causes the closure cap and the tamper-evident ring to at least partially separate.
The closure assembly may also comprise a tamper-evident ring at-tached to the closure spout. Removing the closure spout causes the closure spout and the tamper-evident ring at least partially to separate.
The closure assembly of this invention may comprise only single start retaining arrangement, or it may preferably comprise multi-start retaining arrangements.
Preferably at least one of said first and second retaining ar-rangement has at least two arrangement starts, more preferably four arrangement starts.
Favourably the arrangement starts are equally distanced around the circumference, such that the force for axially holding and rotationally restricting is equally distributed, which supports a reliable closing and a comfortable opening.
In an advantageous embodiment of the invention the first retain-ing arrangement comprises two groups of retaining segments, whereof the first group comprises at least one retaining segment with a lower abutment surface and/or a blocking abutment surface and the second group comprises at least one retaining segment with an upper abutment surfaces and/or a back off cam and/or a mainly horizontal upper surface.
The retaining segments of the first group and the second group typically are axially displaced from each other, in particular, the retaining segments of the first group (lower first retaining segments) are arranged on a first axial plane, which is lower than a second axial plane on which the retaining segments of the second group are arranged (upper first retaining segments).
In the fully secured position the lower first retaining segments engage with the first region of the lower surface of the second retaining arrangement and the upper first retaining segments en-gage with the third region of the lower surface of the second retaining arrangement.
Preferably the second lower surface in the first region has no pitch. Correspondingly the lower first retaining segments also have an upper surface with no pitch and are basically arranged horizontally around the skirt of the closure cap.
Preferably the closure cap can be moved from a fully released to a fully engaged position on the closure spout by a single smooth rotation through 360 or less, preferably through 180 or less, most preferably through about 90 or less.
Furthermore the invention provides a container and a closure as-sembly as described above.
Further benefits and advantages of the present invention will be described in the description and with reference to the following drawings.

Brief description of the drawings:
Figure 1 is a perspective view of a first example of a closure spout;
Figure 2 is a cross section view of a closure cap;
Figure 3a is a perspective view of the closure spout shown in figure 1 in interaction with a first retaining arrange-ment in the fully closed position;
Figure 3b is a perspective view of a second example of a closure spout in interaction with a first retaining arrangement in the fully closed position;
Figure 4 is an enlarged fragmentary view of the closure spout shown in figure 1 in interaction with a first retaining segments in an intermediate degassing position;
Figure 5 is an enlarged fragmentary view of the closure spout shown in figure 1 in interaction with a first retaining segments in an intermediate position after degassing.
Figure 1 is a perspective view of a closure spout 1. The closure spout comprises a dispensing opening 2 and a narrowed cylindri-cal neck 3 with a smooth and slightly rounded rim 4.
The closure spout 1 has a substantially continuous second re-taining arrangement 5 comprising four elongate second retaining segments 6 evenly distributed around the circumference. Each second retaining segment 6 has an upper second retaining surface 7 and a lower second retaining surface 8.
The lower second retaining surface has no pitch in a first re-gion 9, a relatively high pitch in a second region 10 displaced from the first region in an unscrewing direction and no pitch in a third region 11 displaced from said second region 10 in a un-screwing direction.

The second retaining arrangement 5 comprises a lower stopping area 12 adjacent to said first region 9 which provides a stop-ping abutment surface 13, the respective surface normal having a direction. In a plane perpendicular to the axis (hereinafter re-ferred to as horizontal).
The second retaining arrangement 5 further comprises an upper stopping area 14 adjacent to said third region 11 which provides a further stopping abutment surface 15, the surface 15 including an angle B with the axial direction 29.
The second retaining arrangement 5 further comprises a blocking step 16 adjacent to said third region 11 to provide a blocking abutment surface 17, the respective surface normal having a horizontal direction. The blocking step 16 also provides for an lower retaining surface 8a.
Figure 2 is a cross sectional view of a closure cap 100.
The closure cap 100 comprises an upper wall 101 and a skirt 102 depending therefrom. On the inside of the upper wall 101 the closure cap 100 comprises sealing means 103, formed by an outer seal 104, a top seal 105 and a plug seal 106.
A tamper-evident ring 107 is attached to the skirt portion 102 of the closure cap 100. First unscrewing the closure cap causes the closure cap and the tamper-evident ring to separate.
The closure cap 100 comprises a first retaining arrangement 18.
The first retaining arrangement 18 comprises upper first retain-ing segments 19 and lower first retaining segments 20.

The lower first retaining segments 20 are arranged basically horizontally in the same axial plane.
The axial distance between the lower first retaining segments 20 and the upper first retaining segments 19 depends from the axial thickness of the second retaining segment 6. The distance is typically bigger than the axial thickness of the segment 6 at its upper horizontally running end and less than twice its axial thickness (see also Fig 4). The distance typically may be be-tween 1 to 3 mm.
The horizontal length of each lower first retaining segment 20 is between 80 and 120% of the length of the first region or it has typically an angular extension in the circumferential direc-tion of between 15 and 30 . For a closure with 30mm diamtere the horizontal length typically may be 3 to 7 mm. The maximal axial lengths is between 0,7 and 2,5mm.
Each upper first retaining segment 19 has an upper first retain-ing surface 21a and lower first retaining surface 22a, each lower first retaining segment 20 has an upper first retaining surface 21b and lower first retaining surface 22b.
The lower first retaining segments 20 comprise a lower abutment surface 23 with a mainly horizontally directed surface normal.
The upper first retaining segments 19 comprise an upper abutment surface 24. The upper abutment surface 24 includes an angle a, which is between 120 and 160 , with the upper first retaining surface 21a.

The lower first retaining segments 20 comprise a blocking abut-ment surface 25 with a mainly horizontally directed surface nor-mal.
The upper first retaining segments 21 comprises a back off cam 26 arranged on the upper retaining surface 21a. The back off cam 26 has a rounded upper surface to provide for a relatively easy opening when a torque is applied by a user.
Figure 3a is a perspective view of a closure spout 1 in interac-tion with a first retaining arrangement 18 in the fully closed position. The figure only schematically shows the first retain-ing arrangement of a closure cap 100 the rest of which is not fully shown in this figure.
The lower abutment surface 23 abuts against a lower stopping abutment surface 13 to block or restrict rotation of said clo-sure cap in the screwing direction to define or to support the fully secured position.
The upper abutment surface 24 abuts against the upper stopping area 14 to block or restrict rotation of said closure cap 100 in the screwing direction also to define the fully secured posi-tion.
The back off cam 26 abuts against the blocking step 16 to block or restrict rotation of said closure 100 in an unscrewing direc-tion at the fully secured position.
A part of the lower second retaining surface 8 and the stopping abutment surface 13 in the first region 9 of the second retain-ing segment 6 forms a matching fit 27 with at least a part of the upper surface 21 and the lower abutment surface 23 on the lower retaining segments when the closure cap 100 is fully se-cured on the container spout 1.
The upper first retaining surface 21a is engaged with the lower surface 8a of the blocking step 16 to provide an additional ax-ial holding force.
Figure 3b is a perspective view of a second example of a closure spout la in interaction with a first retaining arrangement 18 in the fully closed position.
The closure spout la comprises a second blocking step 16a, wherein the back off cam 26 abuts against the blocking step 16a to block or restrict rotation of said closure 100 in an unscrew-ing direction at the fully secured position.
Figure 4 is an enlarged fragmentary view of one of the second retaining segments 6 of the closure spout 1 in interaction with an upper first retaining segment 19 and a lower first retaining segment 20 in an intermediate degassing position.
The blocking abutment surface 25 of the lower first retaining segment 20 abuts against the blocking step 16 to block or re-strict further rotation of said closure in an unscrewing direc-tion at an intermediate position when said closure cap 100 is under axial pressure in a direction emerging from the closure spout 1.
A part of the lower surface of the second retaining segment 6 in the third region forms a matching fit 28 with at least a part of the upper surface of the lower first retaining segment 20 when the closure cap is at said intermediate position and outwardly displaced on said container spout.

Figure 5 is an enlarged fragmentary view of one of the second retaining segments 6 of the closure spout 1 in interaction with an upper first retaining segment 19 and a lower first retaining segment 20 in an intermediate position after degassing.
When the internal pressures relieves, the matching fit between the lower first retaining segment 20 and the second retaining segment 6 in the third region 11 releases, the closure cap 100 may be moved in axial direction 29 and in unscrewing direction 30 and the lower retaining segment 20 may pass the blocking step 16 of the second retaining segment 6.
The closures assemblies are typically made by injection or com-pression moulding from a plastic material such as polyethylene or polypropylene.

Claims

1. A closure assembly comprising:
a closure spout (1; 1a) adapted to be fitted to the neck of a container, the closure spout (1) comprising a dispensing opening (2), and a closure cap (100) comprising an upper wall (101) and a skirt (102) depending therefrom, adapted to be fitted to the closure spout (1; 1a) for closing the container, a first retaining arrangement (18) on said closure cap (100), said first retaining arrangement (18) comprising at least one elongate first retaining segment (19, 20), each first retaining segment (19, 20) having upper and lower first retaining surfaces (21, 22); and at least one substantially continuous second retaining arrange-ment (5) on said closure spout (1; 1a), said second retaining arrangement (5) comprising at least one elongate second retain-ing segment (6), each second retaining segment having upper and lower second retaining surfaces (7, 8), wherein the lower second retaining surface (8) has no pitch or at least relatively lower pitch in a first region (9), rela-tively higher in a second region (10) displaced from the first region (9) in an unscrewing direction (30) and has no pitch or at least relatively lower pitch in a third region (11) displaced from said second region (10) in a unscrewing direction (30).

2. A closure assembly according to claim 1, wherein the second retaining arrangement (5) comprises a lower stopping area (12) adjacent to said first region (9) which provides a stopping abutment surface (13) and the first retaining arrange-ment (18) comprises a corresponding lower abutment surface (23) on at least one of said first segments (19), which abuts against said lower stopping area (12) to block or restrict rotation of said closure cap (100) in the screwing direction to define the fully secured position and/or wherein the second retaining arrangement (5) comprises an upper stopping area (14) adjacent to said third region (11) which provides a stopping abutment surface (15) and the first retaining arrange-ment comprises a corresponding upper abutment surface (24) on at least one of said first segments (19) which abuts against the upper stopping area (14) to block or restrict rotation of said closure cap in the screwing direction to define the fully se-cured position.

3. A closure assembly according to claim 1 or 2, wherein said lower second retaining surface (8) further comprises a blocking step (16) adjacent to said third region (11) to provide an blocking abutment surface (17) and the first retaining ar-rangement (18) comprises a corresponding blocking abutment sur-face (23) on at least one of said first segments (20) which abuts against said blocking step (16) to block or restrict rota-tion of said closure in an unscrewing direction at an intermedi-ate position when said closure cap is under axial pressure in a direction emerging from the closure spout (1; 1a).

4. A closure assembly according to claims 2 or 3, wherein at least a part of the lower surface (8) and/or the stopping abutment surface (13) in the first region (9) of at least one second retaining segment (6) forms a matching fit (27) with at least a part of said upper surface (21) and/or the corresponding abutment surface (23) on one of said first retaining segments (20) when the closure cap (100) is fully secured on the con-tainer spout and/or wherein at least a part of the lower surface (8) and/or the stopping abutment surface (15) in said third region (11) of at least one of the second retaining segments (6) forms a matching fit with at least a part of the upper surface (21) and/or the correspond-ing abutment surface (24) on one of said first retaining seg-ments (19) when the closure cap (100) is fully secured on the closure spout.

5. A closure assembly according to claim 3 or 4, wherein at least a part of the lower surface (8) of at least one of the second retaining segments (6) in the third region (11) forms a matching fit (28) with at least a part of the upper surface (21) on one of the first retaining segments (20) when the closure cap (100) is at an intermediate position and axially displaced in an upper direction on said container spout.

6. A closure assembly according to at least one of the preceding claims, wherein said lower second retaining surface (8) further comprises a blocking step (16; 16a) adjacent to said third region (11) to provide a blocking abutment surface (17) and at least one of the first retaining segments (20) comprises a back off cam (26) ar-ranged on the upper retaining surface (21) which abuts against said blocking step (16; 16a) to block or restrict rotation of said closure cap (100) in an unscrewing direction (30) at the fully secured position, in particular when said closure cap (100) is under axial pressure in a direction emerging from the closure spout.

7. A closure assembly according to at least one of the preceding claims, wherein the first retaining arrangement (18) is constructed and arranged such that when the closure cap (100) is fully secured on the closure spout (1) the first retaining arrangement (100) contacts the first (9) and third (11) region of at least one second re-taining segment (6) to provide a holding force in axial direc-tion, in particular the first retaining arrangement (18) comprises at least one lower first retaining segment (20) engaging the first region (9) of the lower second retaining surface (8) of at least one second raining segment (6) and the first retaining arrange-ment (18) comprises at least one upper first retaining segment (19) engaging the third region (11) of the lower second retain-ing surface (8) of at one least second raining segment (6), wherein the lower first retaining segment (20) and the upper first retaining segment (19) are axially displaced.

8. A closure assembly according to at least one of the preceding claims, wherein the first retaining arrangement (18) comprises at least one in-tegral retaining segment (19) with an upper abutment surface (24) and a back off cam (26), preferably additionally an upper surface (21a) which provides for an axial force towards the sec-ond retaining arrangement, preferably with no pitch.

9. A closure assembly according to at least one of the previous claims, wherein the closure spout (1; 1a) is adapted to be screwed on a con-tainer and/or comprises anti-rotational elements, which block or prevent rotation of said closure spout in the screwing direction when the closure spout is fully secured on the container, in particular rotational elements adapted for interaction with venting slots in a screw thread of a standard container neck.

10. A closure assembly according to at least one of the previous claims, wherein the first region (9) extends for 5°-40° about the circumference of the container spout (1; 1a) and/or the second region (10) extends for 10°-90° about the circumfer-ence of the container spout (1; 1a) and/or the third region extends (11) for 5°-40° about the circumference of the container spout (1; 1a).

11. A closure assembly according to at least one of the previous claims, wherein the pitch of the lower second retaining surface (8) in the first region (9) is in the range -5° to 10°
and/or the pitch of the lower second retaining surface (8) in the sec-ond region (10) is in the range 5° to 25°
and/or the pitch of the lower second retaining surface (8) in the third region (11) is in the range -5° to 10°.

12. A container closure assembly according to claim 1, wherein at least one of said first and second retaining arrangement (5, 18) has at least two arrangement starts, preferably at least four arrangement starts.

13. A assembly according to claim 1, wherein the first retrain-ing arrangement comprises two groups of retaining segments, whereof the first group comprises at least one retaining segment (20) with a lower abutment surface (23) and/or a blocking abutment surface (25) and the second group comprises at least one retaining segment (19) with an upper abutment surfaces (24) and/or a back off cam (26).

14. A closure assembly according to claim 1, wherein the closure cap (100) can be moved from a fully released to a fully engaged position on the closure spout by a single smooth rotation through 360° or less, preferably through 180° or less, most preferably through about 90° or less.

15. A closing assembly comprising a container and a closure as-sembly according to at least one of the preceding claims.