A closure assembly

Abstract

Closure assembly comprising a spout and a cap provided with an integrated tamper-evident ring member. The spout has a neck around a product passage. The tamper-evident ring member is connected to the cap body via breakable bridges. The neck and tamper-evident ring member are provided with retention members and windows respectively which constrain axial and rotational movement of tamper-evident ring member with respect to the neck. The retention members and retention windows have corresponding engagement surfaces which are inclined with respect to a radial plane.

Description

[0001] A CLOSURE ASSEMBLY

[0002] The present invention relates to a closure assembly.

[0003] Closure assemblies are known with a plastic screw cap which is secured on a neck of a spout. A tamper-evident ring is integrally formed as a part of the cap. In known designs the tamper-evident ring is non-frangible. One or more frangible bridge portions between the tamper-evident ring and the skirt of the cap will be broken when the closure is opened for the first time by a user rotating the cap. The ring remains intact and on the neck.

[0004] Document EP2380820 discloses a screw cap which is secured on the neck of a spout. The screw cap comprises a non-frangible tamper-evident ring and the spout is provided with two circumferential flanges which protrude around the neck. The tamper-evident ring member is confined in the vertical direction between these two flanges, the lower flange comprising a shoulder on which the lower edge of the tamper-evident ring member sits. The lower flange further comprises a rotation preventing boss which fits in an opening, which has an open underside, formed in the lower side of the tamper-evident ring such that the tamper-evident ring member cannot rotate with respect to the neck. This locked-in design of the tamper-evident ring makes it harder to (e.g. inadvertently) remove the tamper-evident ring from the neck, e.g. thereby decreasing the chance that the tamper-evident ring ends up in the environment.

[0005] The present invention aims to provide a closure assembly with an improved retention of the tamper-evident ring member on the neck.

[0006] The first aspect of the invention provides a closure assembly according to claim 1.

[0007] The closure assembly comprises a spout which is made, e.g. moulded, of a plastic material. The spout comprises an attachment portion configured to be secured to a container, e.g. a collapsible pouch or a carton. The spout comprises a neck around a product passage in the spout. The neck has a main axis and forms a mouth at a top end of the product passage. The neck has an exterior side.

[0008] The closure assembly further comprises a cap, preferably a screw cap, which is made, e.g. moulded, of a plastic material and which is secured or to be secured on the neck of the spout. The cap seals the product passage in a closed position of the cap on the neck. The cap comprises a cap body which is configured to be removed from the neck of the spout by a user in a rotational opening direction.

[0009] The cap body comprises a top wall structure and a downward depending skirt, the skirt having an interior side, an exterior side, and a lower edge remote from the top wall structure. The exterior side of the neck and the interior side of the skirt comprise cooperating connection means, preferably screw threads. A bayonet connection is also envisaged.

[0010] The cap further comprises a tamper-evident ring member which is integrally formed to the lower edge of the skirt. The tamper-evident ring member is connected to the lower edge of the skirt via one or more breakable bridges. The tamper-evident ring member is non-frangible.

[0011] The spout comprises one or more retention members, e.g. two, and the tamper-evident ring member defines one or more retention windows, e.g. two. Each retention window has a closed contour. Each retention window is configured to retain therein a respective one of the retention members, such that the tamper-evident ring member is axially and rotationally constrained with respect to the neck when the cap is secured on the neck.

[0012] Each retention member comprises an engagement surface configured to - when the cap is rotated in the opening direction for the first time - engage a corresponding engagement surface of a respective retention window.

[0013] A radial plane encompasses the main axis of the neck and intersects the engagement surface of the retention window, and the engagement surfaces of the retention members and of the retention windows are inclined with respect to the radial plane defining inclination angles (ai, 82) with respect to the radial plane. So, these engagement surfaces do not extend radially with respect to the main axis.

[0014] The one or more retention members and respective retention windows axially and rotationally constrain the tamper-evident ring member with respect to the neck. This will make it harder to remove the tamper-evident ring member from the neck, thereby decreasing the chance that a loose tamper-evident ring member ends up in the environment.

[0015] Due to the cooperating engagement surfaces being inclined with respect to the radial plane, their engagement will cause the retention member to function as a hook. This will prevent the retention window of the tamper-evident ring member from moving over and past the retention member, which may also be seen as jumping over the retention member, when the cap is rotated in the opening direction for the first time and the ring is somewhat entrained with the cap body as the bridge(s) is / are still to be broken. Here the hook-like retention member will exert a force on the engagement surface of the retention window of the tamper-evident ring member which is directed substantially towards the neck, thereby ensuring that the tamper-evident ring member remains on the neck and cannot jump over the retention member, even when the ring is thin. The retention member is also axially restrained in the retention window, so the ring can also not pass above the retention member as well. It is noted in this respect that it is desired to embody the tamper-evident ring thin in order to use as little plastic as possible and to allow for fast production, e.g. in view of cooling time before ejecting the cap from the mould in injection moulding.

[0016] The invention is especially beneficial when the cap is a screw cap. The screw cap will be secured to the neck by a rotational securing motion and opened by a user with an opposite rotational opening motion, i.e. the rotational opening direction. During the opening rotational motion, the corresponding engagement surfaces will come into engagement with each other. Due to the engagement surfaces being inclined with respect to the radial plane, when the surfaces are in engagement and the cap is rotated further, the engagement surface of the retention window and thus the tamper-evident ring will be urged inwards avoiding that the ring jumps over the retention member.

[0017] The retention window extends through the thickness of the tamper-evident ring member from an inner surface of the tamper-evident ring member to an outer surface of the tamper-evident ring member.

[0018] Preferably, the retention member does not stick out of the respective retention window, e.g. the outer end of the retention member being recessed relative to the outer surface of the tamper-evident ring, e.g. just a fraction of a millimetre.

[0019] In embodiments, the retention window is dimensioned such that when the retention member is received therein, it allows for a limited movement of the tamper-evident ring relative to the retention member, e.g. just in rotational direction or, as preferred, both in axial and rotational direction. As can be further understood from the embodiments discussed herein, the term constrained does not exclude a limited movement of the tamper-evident ring member when the cap is removed by rotation for the first time. The closure assembly has an assembled configuration, wherein the cap has been secured on the neck but has not yet been opened by a user. In this assembled configuration each retention member is retained in a respective retention window. The engagement surface of the retention member and a respective engagement surface of the retention window are not in engagement with each other, i.e. the engagement surfaces are spaced apart from each other.

[0020] In an engaged configuration, each retention member is retained in a respective retention window, and the cap has been rotated in the opening direction such that the engagement surfaces of the retention member and retention window are in engagement with each other.

[0021] In an embodiment, the inclination angles (ai,a2) of the engagement surfaces of the retention member and of the retention window is between 20 - 70 degrees, preferably between 50 - 70 degrees.

[0022] In an embodiment, the inclination angles (ai,a2) of the engagement surfaces of the retention members and retention windows are equal to each other. It is also envisaged that the inclination angle of the retention window (ai) is different from the inclination angle of the retention member (a2).

[0023] In an embodiment, the inclination angles (ai) of the engagement surfaces of the retention windows are equal to each other. It is also envisaged that the inclination angles of the engagement surfaces of the retention windows are different from each other.

[0024] In an embodiment, the inclination angles (a2) of the engagement surfaces of the retention members are equal to each other. It is also envisaged that the inclination angles of the engagement surface of the retention members are different from each other.

[0025] In an embodiment, when the engagement surface of a retention member and a respective engagement surface of a retention window are engaged with each other, in the engaged configuration of the cap, the engagement surfaces of the retention member and respective retention window are parallel to each other. This allows for an even force distribution over each respective engagement surface. The engagement surfaces of the retention members and the retention windows are therefore slightly angled with respect to each other, e.g. between 0.5-5 degrees, when the cap is secured on the neck but the cap has not been yet rotated in the opening direction, e.g. in the assembled configuration of the cap. In an embodiment, the attachment portion is configured to be heat-sealed to the container.

[0026] In an embodiment, the attachment portion has a vertical plane of symmetry between opposed sealing faces thereof, for example between a first sealing wall and an opposed second sealing wall, e.g. allowing for heat-sealing the attachment portion between wall portions of a pouch. For example, the sealing faces, e.g. walls, have a continuous curvature between their ends located in the plane of symmetry, e.g. as in W003031280, e.g. the ends of the attachment portion being pointed. In another embodiment, the sealing faces, e.g. walls, each are composed of a first rectilinear portion, a central curved portion, and a second rectilinear portion, e.g. as in WO2021160675. Preferably, the engagement surfaces of the retention members and the retention windows are inclined with respect to the vertical plane of symmetry of the attachment portion, e.g. the engagement surfaces being angled by between 0.1-5 degrees with respect to the vertical plane of symmetry. This geometry allows for an easier production of the spout, e.g. easier ejection from a mould.

[0027] In an embodiment, the attachment portion is a embodied as a planar attachment portion to be secured, e.g. heat-sealed, to a wall of the container, e.g. to a wall portion of a pouch or a carton. For example, the attachment portion extends in a plane generally perpendicular to the main axis.

[0028] In an embodiment, the closure assembly has exactly two diametrically opposed retention members on the spout and respective retention windows in the tamper-evident ring member.

[0029] In an embodiment, the spout comprises one or more flanges which each protrude outwardly from the exterior of the neck. The one or more flanges each have an upward facing surface, a downward facing surface, and an outer edge. The one or more retention members are arranged in proximity of the one or more flanges and extend radially beyond the outer edge of the one or more flanges. When the cap is secured on the neck, an inner surface of the tamper-evident ring member abuts one or both outer edges the upper flange and of the lower flange, preferably the upper flange, more preferably abutting both the outer edge of the upper and lower flange, e.g. wherein the retention member is arranged between these flanges. The one or more flanges may provide inner support for the tamper-evident ring member. In combination with the inclined engagement surfaces of the retention members and retention windows, this will ensure that the tamper-evident ring member does not jump out, which will make it more difficult to (inadvertently) remove the tamper-evident ring member from the neck, even when the ring is rather thin. Thus by having the inner surface of the tamper-evident ring member abut the outer edge of one or more flanges, in particular at least in proximity of the retention members, the tamper-evident ring member will be more securely retained on the neck.

[0030] In an embodiment, at least a portion of the inner surface of the tamper-evident ring member at and / or in proximity of each retention window abuts one or both outer edges of the upper flange and of the lower flange, preferably both flanges.

[0031] In an embodiment, the spout comprises a lower flange and an upper flange which are spaced apart. The one or more retention members are arranged between the lower flange and the upper flange. When the cap is secured on the neck, the inner surface, at least a portion thereof, of the tamper-evident ring member abuts one or both of the outer edges of the upper flange and of the lower flange. Preferably, at least a portion of the inner surface of the tamper-evident ring member at and / or in proximity of the retention window abuts the outer edge of both the upper flange and the lower flange. The lower and upper flange will provide inner support to the tamper-evident ring member at two spaced apart vertical locations, thereby ensuring an even better hold of the tamper-evident ring member. The inclined engagement surface of the retention member will urge the engagement surface of the retention window inwardly, and the upper and lower flange provide an outward reaction force to the tamper-evident ring member, thereby ensuring that the tamper-evident ring member remains locked and does not jump over the retention member.

[0032] In an embodiment, the one or more retention members are arranged such that the one or more retention members are vertically spaced from both the lower flange and the upper flange, e.g. the one or more retention members are not directly connected to the upper and lower flange and only adjoin the neck. By arranging the one or more retention members vertically spaced apart from the both the lower flange and the upper flange, during the moulding process, it allows for faster cooling of the retention members, such that the cap can be removed from a mould faster, thereby decreasing production time. In another embodiment, the one or more retention members are integrally moulded to both the lower flange and the upper flange, e.g. with a gap between the retention member and the neck.

[0033] In an embodiment, each of the one or more retention windows comprises a downward urging portion, wherein - when the cap is rotated in an opening direction for the first time - the tamper-evident ring member is rotated as well, over a limited angle, such that each retention member and the downward urging portion are brought into engagement and the retention member and the downward urging portion interact causing the tamper-evident ring member to be urged in a downward direction with respect to the neck, e.g. relative to the flanges. Preferably, when the one or more retention member is initially received in a respective retention window, the retention members are not in contact with the downward urging portion and comes only in contact with the downward urging portion when the cap is rotated in the opening direction for the first time. When the cap body is then replaced back on the neck, i.e. screwed onto the neck to seal the product passage, there will be a larger vertical distance between the lower edge of the skirt and the tamper-evident ring member than before breaking of the one or more bridges. It will be appreciated that in this arrangement, the tamper-evident ring is able to move downward relative to the neck, e.g. as the flanges only abut the inner surface of the ring and do not vertically fixate the ring, e.g. the abutment only providing friction. Also, the retention member will fit in the window with some vertical play to allow for the relative downward motion of the ring. This arrangement makes it easier for a user to see if the cap has been previously opened. Preferably, the downward urging portion is configured such that the tamper-evident ring portion is moved downwards before the breakable bridges are broken, and only once the tamper-evident ring member has moved downward will the breakable bridges break. The amount of downward motion can be relatively small, yet noticeable, e.g. between 0.2 and 0.8 millimetre, e.g. about 0.4 millimetre.

[0034] In an embodiment, the spout comprises at least one flange, e.g. a lower flange and an upper flange which are spaced apart, wherein each flange protrudes outwardly from the exterior of the neck. Each flange has an outer edge. The one or more retention members are arranged between the lower flange and the upper flange and extend radially beyond the outer edge of each flange. When the cap is secured on the neck, the inner surface, at least a portion thereof, of the tamper-evident ring member abuts the outer edge of each flange. When the cap is secured on the neck, the engagement surfaces of the retention member and of the retention window are spaced apart in rotational opening direction. Herein each retention window comprises a downward urging portion, such that - when the cap is rotated in the opening direction for the first time - the tamper-evident ring member is rotated along with the cap body such that the engagement surfaces come closer to one another and the retention member and the downward urging portion are brought into engagement causing the retention member and the downward urging portion to interact such that the tamper-evident ring member is urged in a downward direction with respect to the one or more flanges.

[0035] In an embodiment, the closed contour of the retention window comprises an upper edge, a lower edge, and two side edges, wherein the downward urging portion is embodied as an upwardly inclined surface portion of the lower edge of each of the one or more retention windows. Preferably, the upwardly inclined surface portion extends to the engagement surface of retention window. When the upwardly inclined surface portion comes into engagement with a respective retention member, the upwardly inclined surface portion will urge the tamper-evident ring member downwards relative to the neck. In embodiments, the frictional abutment with the outer edges of the lower and upper flanges causes the ring to remain in the lowered position achieved by the downward motion.

[0036] In an embodiment, the retention member comprises a corresponding downward urging portion, wherein - when the cap is rotated in an opening direction for the first time - the corresponding downward urging portions of the one or more retention windows and a respective retention member are brought into engagement and interact such that the tamper-evident ring member is urged in a downward direction with respect to the neck, preferably wherein downward urging portion of the retention members is a downwardly inclined surface configured to engage the upwardly inclined surface portion of the retention window. The corresponding downward urging portion allowing for a smoother engagement, thereby ensuring that the downward movement of the tamper-evident ring member is completed before the breakable bridges are broken.

[0037] In an embodiment, the spout comprises multiple anti-compression ribs which each extend away from the neck. Preferably, all of the anti-compression ribs extend in the same direction and parallel to each other, e.g. in a direction perpendicular to the vertical plane of symmetry of the attachment portion. Each anti-compression rib has an outer end and the outer ends of two or more anti-compression ribs abut the inner surface of the tamper-evident ring when the cap is secured on the neck. Preferably, the anti-compression ribs each connect to the lower flange and the upper flange.

[0038] In an embodiment, two diametrically opposed aligned anti-compression ribs are provided, wherein two retention members are arranged diametrically opposed from each other such that the two anti-compression ribs and the two retention members are arranged evenly over the circumference of the neck, e.g. spaced radially 90 degrees apart from each other. This makes that one cannot compress the tamper-evident ring member at and nearby the location of the anti-compression ribs and thereby locally increase the diameter of the tamper-evident ring member at the retention window allowing the ring to jump over a respective retention member.

[0039] In an embodiment, wherein the spout comprises an upper flange, wherein the upper flange comprises a downward facing surface, wherein the tamper-evident ring member comprises an inner surface and an outer surface, wherein the tamper-evident ring member further comprises one or more axial constraining portions, wherein the one or more axial constraining portions comprise an inner surface and an outer surface, wherein the inner surface of each axial constraining portion defines an inwardly protruding ridge, wherein - when the cap is secured to the neck - the ridge abuts the downward facing surface of the upper flange, preferably wherein the outer surface of the axial constraining portion defines an inwardly protruding indentation.

[0040] In an embodiment, the tamper-evident ring member comprises four axial constraining portions arranged around the tamper-evident ring member.

[0041] In an embodiment, the exterior side of the neck and the interior side of the skirt are provided with cooperating angular positioning members which define a predetermined angular position of the cap body with respect to the neck when the cap is rotationally secured to the neck in the closed position. The predetermined angular position is such that the one or more retention members are retained in a corresponding retention window. Preferably, each angular positioning members of the neck is arranged directly above a respective retention member. The angular positioning members allow for a quick securing of the cap with respect to the neck, e.g. by a capping machine, wherein it is ensured that when the cap has been secured to the neck, the one or more retention members are retained in a respective retention window.

[0042] In an embodiment, the exterior of the neck and the interior of the skirt are each provided with two cooperating angular positioning members. The two angular positioning members arranged on the exterior of the neck are embodied as two diametrically opposed angular positioning bosses, wherein the bosses extend upwards from an upper flange of the spout and / or outwardly from the exterior of the neck, preferably both. The two angular positioning members arranged on the interior of the skirt are embodied as two diametrically opposed angular positioning flanges, wherein the angular positioning flanges are radially spaced inwards from the interior of the skirt. The angular positioning flanges extend along a portion of the circumference of the skirt, and wherein the angular positioning flanges follow the curve of the circumference of the skirt. When the cap is secured to the neck, the angular positioning flanges will come into contact with the angular positioning flanges thereby stopping the movement of the cap with respect to the neck. Preferably, the cap is secured using an assembly system which comprises a torque sensor, wherein - when the angular positioning flanges come into contact with the angular positioning bosses - a predetermined torque acts on the assembly system, thereby stopping the securing motion. In an embodiment, each of the one or more retention members has a ramp surface which is configured to flex the tamper-evident ring member outwards during the process of initially securing the cap on the neck of the spout. Preferably, the ramp surface is configured such that a capping machine is able to rotate the tamper-evident ring member over the ramp surface such that the retention member then becomes retained in a respective retention window.

[0043] In an embodiment, the tamper-evident ring member has - when viewed in a horizontal crosssection - a portion with an increased thickness at and in the proximity of the engagement surface of each of the retention windows. The portion of increased thickness may project inward and is then configured such that it allows for the downward motion of the tamper-evident ring member with respect to the neck, e.g. relative to the flanges. When the corresponding engagement surfaces are brought into engagement considerable forces will act on the engagement surfaces, by having an increased thickness it is ensured that the tamper-evident ring member remains intact.

[0044] In an embodiment, one of the one or more breakable bridges is arranged directly above a retention window. Preferably, exactly one breakable bridge is arranged directly above each retention window. The forces caused by the opening of the cap for the first time will be highest near the retention window, by arranging a breakable bridge directly above the retention window it is ensured and made easy for a user to break the breakable bridge(s) when the cap is rotated in an opening direction for the first time.

[0045] In an embodiment, the top wall structure comprises an indentation and a central protrusion to form a W-seal, which seals onto the neck of the inside of the neck.

[0046] In an embodiment, the cap comprises, preferably at diametrically opposed locations, a screw-on torque portion projecting downward from the skirt into a recess at the top of the tamper-evident ring member. Upon screwing the cap onto the neck by a capping machine, this arrangement transmits torque to the tamper-evident ring, so that the ring can then flex over the retention members.

[0047] A second aspect of the invention relates to a closure assembly comprising:

[0048] - a spout which is made, e.g. moulded, of a plastic material, wherein the spout comprises an attachment portion configured to be secured to a container body and wherein the spout comprises a neck around a product passage in the spout, the neck having a main axis and forming a mouth at a top end of the product passage, and wherein the neck has an exterior side;

[0049] - a cap, preferably a screw cap, which is made, e.g. moulded, of a plastic material and which is secured or to be secured on the neck of the spout, wherein the cap seals the product passage in a closed position of the cap on the neck, wherein the cap comprises a cap body which is configured to be removed from the neck of the spout by a user in a rotational opening direction,

[0050] wherein the cap body comprises a top wall structure and a downward depending skirt, the skirt having an interior side, an exterior side, and a lower edge remote from the top wall structure, wherein the exterior side of the neck and the interior side of the skirt comprise cooperating connection means, preferably screw threads,

[0051] wherein the cap further comprises a tamper-evident ring member which is integrally formed to the lower edge of the skirt, wherein the tamper-evident ring member is connected to the lower edge of the skirt via one or more breakable bridges, wherein the tamper-evident ring member is non-frangible,

[0052] wherein the spout comprises one or more retention members, and wherein the tamper-evident ring member defines one or more retention windows, each retention window having a closed contour, and wherein each retention window is configured to retain therein a respective one of the retention members, such that the tamper-evident ring member is axially and rotationally constrained with respect to the neck when the cap is secured on the neck,

[0053] wherein each of the one or more retention windows comprises a downward urging portion, wherein - when the cap is rotated in an opening direction for the first time - the tamper-evident ring member is rotated such that each retention member and the respective downward urging portion are brought into engagement and the retention member and the downward urging portion interact causing the tamper-evident ring member to be urged in a downward direction with respect to the spout.

[0054] The closure assembly according to the second aspect of the invention provides a user with an enhanced visual indication - when the cap body is replaced back on the neck - that the cap body has been opened previously. In many prior art closure assemblies, when the cap body is replaced back on the neck after first time opening, the cap body is in a substantially similar position with respect to the tamper-evident ring member as the position of the cap body prior to the first time opening, i.e. when the cap body was still connected to the tamper-evident ring member via the one or more breakable bridges. This often leads to the remnants of the one or more breakable bridges lining up, which makes it difficult for a user to see whether these breakable bridges are actually broken before or still intact, especially when considering the small sizes of these breakable bridges. As already explained above in the context of the first aspect of the invention, the interaction of the retention member with the respective downward urging portion of the one or more retention windows urges the tamper-evident ring member downwards when the cap is rotated in the opening direction for the first time and the tamper-evident ring is entrained somewhat in rotational opening direction. When the cap body is replaced back on the neck, there will be a larger vertical distance between the lower edge of the skirt and the tamper-evident ring member, and between the remnants of the one or more breakable bridges, thereby making it easier for a user to see if the cap has been previously opened. Preferably, the downward urging portion is configured such that the tamper-evident ring portion is moved downwards before the breakable bridges are broken, and only once the downward movement of the tamper-evident ring member is completed, the breakable bridges will break.

[0055] In an embodiment, the tamper-evident ring member is moved between 0.2 mm and 1 mm downwards with respect to the neck, preferably about 0.4 mm downwards.

[0056] In an embodiment, the closed contour of the retention window comprises an upper edge, a lower edge, and two side edges, wherein the downward urging portion is embodied as an upwardly inclined surface portion of the lower edge of each of the one or more retention windows. Preferably, the upwardly inclined surface portion extends to the engagement surface of retention window. When the upwardly inclined surface portion comes into engagement with a respective retention member, the upwardly inclined surface portion will urge the tamper-evident ring member downwards relative to the neck.

[0057] In an embodiment, the retention member comprises a corresponding downward urging portion, wherein - when the cap is rotated in an opening direction for the first time - the corresponding downward urging portions of the one or more retention windows and a respective retention member are brought into engagement and interact such that the tamper-evident ring member is urged in a downward direction with respect to the neck. Preferably, the downward urging portion of the retention members is a downwardly inclined surface configured to engage the upwardly inclined surface portion of the retention window. The corresponding downward urging portion allowing for a smoother engagement, thereby ensuring that the tamper-evident ring member is moved completely downward before the breakable bridges are broken.

[0058] In an embodiment, the spout comprises one or more flanges which each protrude outwardly from the exterior of the neck. The one or more flanges have an upward facing surface, a downward facing surface, and an outer edge. The one or more retention members are arranged in proximity of the one or more flanges and extend radially beyond the outer edge of the one or more flanges, and wherein- when the cap is secured on the neck - an inner surface of the tamper-evident ring member abuts the outer edge of at least one of the one or more flanges.

[0059] In an embodiment, the spout comprises a lower flange and an upper flange which are vertically spaced apart. The one or more retention members are arranged between the lower flange and the upper flange. When the cap is secured on the neck, the inner surface, at least a portion thereof, of the tamper-evident ring member abuts the outer edge of the upper flange and the lower flange. Preferably, at least a portion of the inner surface of the tamper-evident ring member at and / or in proximity of the retention window abuts the outer edge of the upper flange and the lower flange.

[0060] In an embodiment, the tamper-evident ring member comprises an inner surface and an outer surface, wherein the tamper-evident ring member further comprises one or more axial constraining portions, wherein an inner surface of the axial constraining portion defines an inwardly protruding ridge, wherein - when the cap is secured to the neck - the ridge abuts a downward facing surface of the upper flange. Preferably, the outer surface of the axial constraining portion defines an inwardly protruding indentation, e.g. the wall thickness of the tamper-evident ring member remains approximately constant. The one or more axial constraining portions provide additional prevention of the tamper-evident ring member from moving upwards with respect the neck.

[0061] In an embodiment, one of the one or more breakable bridges is arranged directly above a retention window. Preferably, one breakable bridge is arranged directly above each retention window. The forces caused by the opening of the cap for the first time will be highest near the retention window, by arranging a breakable bridge directly above the retention window it is ensured and made easy for a user to break the breakable bridge(s) when the cap is rotated in an opening direction for the first time. It will be appreciated that the closure assembly according to the second aspect may also further comprise one or more technical features discussed herein, e.g. in the claim set and / or with reference to examples, and / or with reference to the first aspect.

[0062] The invention further relates to a container provided with a closure assembly described herein, e.g. a collapsible pouch container, e.g. wherein the attachment portion is secured between opposed film walls of the collapsible pouch container, or between cartons, or on a carton.

[0063] The invention further relates to a method for manufacturing a closure assembly described herein, comprising the steps of:

[0064] - providing the spout,

[0065] - injection moulding the cap with integral tamper-evident ring,

[0066] - securing the cap with integral tamper evident ring on the neck of the spout.

[0067] The invention will now be discussed with reference to the drawings. In the drawings:

[0068] Figs. 1a - b, show an isometric view of a first example of a closure assembly,

[0069] Fig. 2 shows a vertical cross-section of the closure assembly,

[0070] Fig. 3 shows a horizontal cross-section of the closure assembly,

[0071] Fig. 4 shows a close-up view of a vertical cross-section at the retention window,

[0072] Figs. 5a - b show another example of the closure assembly comprising a downward urging portion according to the second aspect of the invention,

[0073] Figs. 6a - b show a close-up view of the retention window and retention member,

[0074] Fig. 7 shows a horizontal cross-section of the alternative embodiment of the closure assembly,

[0075] Figs. 8a - b show a front view of the closure assembly in the initial secured configuration and the configuration where the cap body has already been removed previously,

[0076] Fig. 9 shows a cross-section of the axial constraining portion.

[0077] Figure 1 shows a closure assembly 1 comprising a spout 10 and a cap 2.

[0078] The spout 10 is made of a plastic material, e.g. by injection moulding.

[0079] The spout 10 comprises an attachment portion which is configured to be secured to a container body, here between film walls of a collapsible pouch. The spout 10 comprises a neck 11 on top of the attachment portion, which neck 11 extends around a product passage 12 in the spout 10.

[0080] The neck 11 has a main axis 13 and forms a mouth at a top end of the product passage 12. The neck 11 has an exterior side.

[0081] As shown, the cap 2 is a screw cap which is made of a plastic material and is secured on the neck 11 of the spout 10. The screw cap 2 seals the product passage 12 in a closed position, shown in Figure 1a.

[0082] The cap 2 comprises a cap body 30 which is configured to be removed from the neck 11 of the spout 10 by a user turning the cap 2 in a rotational opening direction.

[0083] The cap body 30 comprises a top wall structure 31 and a downward depending skirt 32. The skirt 32 having an interior side, and exterior side, and a lower edge remote from the top wall structure 31. The exterior of the neck 11 and the interior side of the skirt 32 comprises cooperating connection screw threads 33a, 33b.

[0084] The exterior side of the skirt 32 comprises gripping element 32a which allow a user to grip and rotate the cap body 30 more easily.

[0085] The cap 2 further comprises a tamper-evident ring member 50 which is integrally formed to the lower edge of the skirt 32. The tamper-evident ring member 50 is connected to the lower edge of the skirt 32 via breakable bridges 51. The tamper-evident ring member 50 is non frangible, so remains intact and on the neck 11 upon removal of the cap body 30.

[0086] The spout 10 has two diametrically opposed retention members 14 and the tamper-evident ring member 50 two diametrically opposed retention windows 52 therein.

[0087] Each retention window 52 has a closed contour and is configured to retain therein a respective one of the retention members 14 such that the tamper-evident ring member 50 is axially and rotationally constrained with respect to the neck 11 when the cap 2 is secured on the neck 11.

[0088] Each retention member 14 has an engagement surface 15 and each retention window 52 has a corresponding engagement surface 53, which are configured to come into engagement with each other when the cap 2 is rotated in the opening direction O for the first time. A radial plane R encompasses the main axis 13 of the neck 11 and intersects the engagement surface 53 of the retention window 52.

[0089] The engagement surfaces 53 of the retention windows 52 are at an inclination angle ai with respect to the radial plane R. The engagement surfaces 15 of the retention member 14 are at an inclination angle a2 with respect to the radial plane R. The inclination angles ai ,a20f the engagement surfaces 15, 53 of the retention member 14 and the retention window 52 are between 20 - 70 degrees, preferably between 50 - 70 degrees.

[0090] When the engagement surface 15 of a retention member 14 and a respective engagement surface 53 of a retention window 52 are engaged with each other - the engagement surfaces 15, 53 of the retention member 14 and respective retention window 52 are preferably parallel to each other, i.e. in the engagement configuration.

[0091] Due to the inclined orientation of the engagement surfaces 15, 53 the retention member 14 acts as a hook for the tamper-evident ring member 50 when the closure is opened for the first time. This avoids that the tamper-evident ring member 50 jumps over the retention member 14, even in an embodiment wherein the retention member 14 does not protrude outward from the outer surface of the tamper-evident ring member 50. The hook-like retention member 14 will exert a force on the engagement surface 53 of the tamper-evident ring member 50 which is directed substantially towards the neck 11, thereby ensuring that the tamper-evident ring member 50 remains on the neck 11 and cannot jump over the retention member 14, even when the ring 50 is thin. The retention member 14 is also axially restrained in the retention window 52, so the ring 50 can also not pass above the retention member 14 as well.

[0092] The spout 10 has an attachment portion 17 which has a vertical plane of symmetry S. In figure 1 the attachment portion includes horizontal plates have edges defining the sealing faces 17a, 17b of the attachment portion, here the so-called diamond shape with two rectilinear portions and a central curved portion. The plane S extends through the pointed ends of the attachment portion 17. In figure 5a, the attachment portion 17 also has a vertical plane of symmetry S, here between a first sealing wall and an opposed second sealing wall.

[0093] Preferably, the engagement surfaces 15, 53 of the retention member 14 and the retention window 52 are inclined with respect to the vertical plane of symmetry S, e.g. the engagement surfaces being inclined by an angle of between 0.1-5 degrees. This enhances production of the spout 10, e.g. in view of ejection from the mould. In Figures 3 and 7, the engagement surfaces 15, 53 are shown to be perpendicular to the vertical plane of symmetry.

[0094] Figures 3 and 7 show the closure assembly in a assembled configuration, e.g. prior to a first time opening of the cap by a user, wherein the retention members 14 are retained by the retention windows 52, and wherein the engagement surface 15 of the retention member 14 and a respective engagement surface 53 of the retention window 52 are not in engagement with each other, i.e. the engagement surfaces are spaced apart from each other. Preferably, in this assembled configuration the engagement surfaces 15, 53 are not parallel to each other.

[0095] The spout 10 has a lower flange 18 and an upper flange 19 which each protrude outwardly from the exterior of the neck 11. The lower flange 18 and the upper flange 19 are vertically spaced apart.

[0096] The lower flange 18 is vertically spaced from the attachment portion 17.

[0097] The lower flange 18 and the upper flange 19 each have an upward facing surface 18a, 19a, a downward facing surface 18b, 19b, and an outer edge 18c, 19c.

[0098] The one or more retention members 14 are arranged between the lower flange 18 and the upper flange 19.

[0099] The retention members 14 each extend radially beyond the outer edge 18c of lower flange 18 and the outer edge 19c of the upper flange 19, as can be seen in Figures 1b, 3 and 7.

[0100] The outer edges 18c, 19c are circular, or at least include circular edge portions, here with straight edge portions in proximity of the retention members 14.

[0101] As can be seen in Figure 4, when the cap 2 is secured on the neck 11 an inner surface 50a of the tamper-evident ring member 50 abuts the outer edges 18c, 19c of the lower flange 18 and the upper flange 19. As will be explained below in more detail, the ring member 50 frictionally abuts these edges 18c, 19c.

[0102] When the cap 2 is rotated in the opening direction O for the first time, the engagement surface 15 of the retention member 14 will come into contact with the engagement surface 53 of the retention window 52 and will act as a hook for the tamper-evident ring member 50, tending to force the caught portion of the ring inwards. The lower flange 18 and the upper flange 19 will then provide a supporting reactive force in the outward direction. This ensures a secure grip on the tamper-evident ring member 50 by the retention member 14, so that the ring 50 cannot deform so as to jump over the retention member 14, even with the ring 50 being thin (e.g. to minimize use of plastic material). This ensures that the tamper-evident ring member 50 is securely secured on the neck 11.

[0103] The retention members 14 in figures 1 - 4 are arranged such that they are vertically spaced from both the lower flange 18 and the upper flange 19, i.e. the one or more retention members 14 are not directly connected to the lower and upper flange 18, 19. These members 14 are integral with the neck 11 at their inner end.

[0104] Figures 5 - 8 show another example of the closure assembly 1, which illustrates both the first aspect and the second aspect of the invention, whereas the earlier example only includes the first aspect of the invention. It will be appreciated that, in another embodiment, the closure assembly may only include the second aspect of the invention.

[0105] Each retention window 52 has a closed contour, now with a downward urging portion 54. When the cap 2 is rotated in an opening direction O for the first time, the tamper-evident ring member 50 is entrained in rotation somewhat before the engagement surfaces 15, 53 block any further rotation. In this process, the retention member 14 and the downward urging portion 54 of the retention window 52 come into engagement and the retention member 14 and the downward urging portion 54 interact such that the tamper-evident ring member 50 is urged in a downward direction with respect to the neck 11, here relative to the flanges internally abutting the ring member.

[0106] When the retention member 14 is initially received in the retention window 52 upon screwing the cap 2 on the neck 11 , the retention member 14 is, preferably, not in contact with the downward urging portion 54. It only comes in contact with the downward urging portion 54 when the cap 2 is rotated in the opening direction O for the first time. The interaction with the downward urging portion 54 of the retention windows 52 urges the tamper-evident ring member 50 downwards when the cap 2 is rotated in the opening direction O for the first time. The tamper-evident ring member 50 being moved between 0.2 - 1 mm downwards with respect to the neck 11, preferably 0.4 mm downwards.

[0107] The closed contour of the retention windows 52 comprise an upper edge 52a, a lower edge 52b, and two side edges 52c, 52d. The downward urging portion 54 is embodied as an upwardly inclined surface portion 54 of the lower edge 52b of each of the one or more retention windows 52, the upwardly inclined surface portion 54 extending to the engagement surface 53 of retention window 52.

[0108] Figure 8a shows the cap 2 when it is initially secured to the neck 11.

[0109] The tamper-evident ring member 50 and the lower edge of the skirt 32 of the cap body 30 are connected via multiple breakable bridges 51. A portion of the lower flange 18 of the spout 10 can be seen below the lower edge of the tamper-evident ring member 50.

[0110] Figure 8b shows the closure assembly 1 wherein the cap body 30 has been removed at least once from the neck, during this first opening the downward urging portion 54 urged the tamper-evident ring member 50 downwards with respect to the neck 11, the tamper-evident ring member 50 now completely covers the lower flange 18, and the breakable bridges 51 were broken after the tamper-evident ring member 50 has been moved completely downward with respect to the neck 11. As can be seen, when the cap body 30 is replaced back on the neck 11 by a user, the vertical distance between the tamper-evident ring member 50 and the lower edge of the skirt 32 is larger than when the cap 2 was initially secured to the neck 11 , providing a more clear visual indication that the closure assembly 1 has been opened previously.

[0111] As shown in Figure 6b, the retention member 14 has a corresponding downward urging portion 14a, wherein - when the cap 2 is rotated in the opening direction O for the first time -the corresponding downward urging portions 14a, 54 are brought into engagement and interact such that the tamper-evident ring member 50 is urged in a downward direction with respect to the neck 11. The downward urging portion 14a of the retention members 14 is a downwardly inclined surface 14a configured to engage the upwardly inclined surface portion 54 of the retention window 52.

[0112] As shown best in Figure 7, the spout 10 comprises multiple anti-compression ribs 20 which each extend perpendicular to the plane of symmetry S of the attachment portion 17, away from the neck 11. Two diametrically opposed aligned anti-compression ribs 20 are arranged on the neck 11, such that the two anti-compression ribs 20 and the two retention members 14 are arranged evenly about the neck 11, i.e. spaced radially 90 degrees apart from each other. The anti-compression ribs 20 each have an outer end 20a which abuts the inner surface 50a of the tamper-evident ring member 50 when the cap is secured on the neck 11. The anticompression ribs 20 are located between the lower flange 18 and the upper flange 19. The tamper-evident ring member 50 has an inner surface 50a and an outer surface 50b. The tamper-evident ring member 50 further comprises one or more axial constraining portions 55. The inner surface 55a of the axial constraining portion 55 defines an inwardly protruding ridge 56, wherein - when the cap 2 is secured to the neck 11 - the ridge 56 abuts the downward facing surface 19b of the upper flange 19, as shown in Figure 9. The outer surface 55b of the axial constraining portion 55 defines an inwardly protruding indentation 57 such that the wall thickness of the tamper-evident ring member 50 remains approximately constant, see Figure 9.

[0113] The exterior of the neck 11 and the interior of the skirt 32 are provided with cooperating angular positioning portions 21, 22 which define a predetermined angular position of the cap body 30 with respect to the neck 11 when the cap 2 is rotationally secured to the neck 11 in the closed position. The predetermined angular position is such that the one or more retention members 14 are each retained in a corresponding retention window 52.

[0114] The two angular positioning portions 21 are embodied as two diametrically opposed angular positioning bosses 21, which are arranged on the upper flange, directly above a respective retention member 14. The bosses 21 extend upwards from the upper facing surface 19a of the upper flange 19 of the spout 10 and outwardly from the exterior of the neck 11.

[0115] The two angular positioning portions 22 are arranged on the skirt 32. When the cap 2 is secured to the neck 11 , the angular positioning portions 22 will come into contact with the angular positioning portions 21 thereby stopping the movement of the cap 2 with respect to the neck 11.

[0116] The retention members 14 have a ramp surface 23 which is configured to flex the tamper-evident ring member 50 outwards during the process of securing the cap 2 with the tamper-evident ring member 50 on the neck 11 of the spout 10.

[0117] As seen in Figures 3 and 7, the tamper-evident ring member 50 has a portion with an increased thickness 50c at and in the proximity of the engagement surface 53 of each of the retention windows 52. As can be seen in Figure 4, the portion with an increased thickness 50c is arranged at a middle portion of the tamper-evident ring member 50 such that it allows for the downward motion of the tamper-evident ring member 50 with respect to the neck 11. One of the one or more breakable bridges 51 is arranged directly above a retention window 52.

[0118] The top wall structure 31 comprises an indentation 31a and a central protrusion 31b to form a W-seal, which seals onto the neck 11 of the inside of the neck 11.

[0119] As shown in Figure 5a the cap 2 further comprises - here at diametrically opposed locations - a screw-on torque portion 60 projecting downward from the skirt into a recess 61 at the top of the tamper-evident ring member 50. Upon screwing the cap onto the neck by a capping machine, this arrangement transmits torque to the tamper-evident ring 50, so that the ring 50 can then flex over the retention members 14.

Claims

C LA I M S1. A closure assembly (1) comprising:- a spout (10) which is made, e.g. moulded, of a plastic material, wherein the spout comprises an attachment portion (17) configured to be secured to a container body and wherein the spout comprises a neck (11) around a product passage (12) in the spout, the neck having a main axis (13) and forming a mouth at a top end of the product passage, and wherein the neck has an exterior side;- a cap (2), preferably a screw cap, which is made, e.g. moulded, of a plastic material and which is secured or to be secured on the neck (11) of the spout, wherein the cap seals the product passage (12) in a closed position of the cap on the neck, wherein the cap comprises a cap body (30) which is configured to be removed from the neck of the spout by a user in a rotational opening direction (O),wherein the cap body (30) comprises a top wall structure (31) and a downward depending skirt (32), the skirt having an interior side, an exterior side, and a lower edge remote from the top wall structure, wherein the exterior side of the neck (11) and the interior side of the skirt (32) comprise cooperating connection means (33a, 33b), preferably screw threads,wherein the cap further comprises a tamper-evident ring member (50) which is integrally formed to the lower edge of the skirt (32), wherein the tamper-evident ring member is connected to the lower edge of the skirt via one or more breakable bridges (51), wherein the tamper-evident ring member is non-frangible,wherein the spout (10) comprises one or more retention members (14), and wherein the tamper-evident ring member (50) defines one or more retention windows (52), each retention window having a closed contour (52a, 52b, 52c, 52d), and wherein each retention window is configured to retain therein a respective one of the retention members, such that the tamper-evident ring member is axially and rotationally constrained with respect to the neck when the cap is secured on the neck,wherein each retention member comprises an engagement surface (15) configured to - when the cap is rotated in the opening direction for the first time - engage a corresponding engagement surface (53) of a respective retention window,wherein a radial plane (R) encompasses the main axis (13) of the neck and intersects the engagement surface (53) of the retention window,wherein the engagement surfaces (15, 53) of the retention member and of the retention window are inclined with respect to the radial plane (R) defining inclination angles (ai, 82).

2. Closure assembly according to claim 1 , wherein the inclination angles (ai, a2) of the engagement surfaces (15, 53) of the retention member and the retention window are between 20 - 70 degrees, preferably between 50 - 70 degrees.

3. Closure assembly according to claim 1 or 2, wherein - when the engagement surface (15) of a retention member (14) and a respective engagement surface (53) of a retention window (52) are engaged with each other - the engagement surfaces of the retention member and respective retention window are parallel to each other.

4. Closure assembly according to any one or more of claims 1-3, wherein the spout and the tamper-evident ring member have two diametrically opposed retention members (14) and two retention windows (52) respectively.

5. Closure assembly according to any one or more of claims 1 - 4, wherein the spout comprises a lower flange (18) and an upper flange (19) which are spaced apart and each protrude outwardly from the exterior of the neck, and wherein each of the lower flange (18) and an upper flange (19) has an outer edge (18c, 19c),wherein the one or more retention members (14) are arranged between the lower flange and the upper flange and extend radially beyond the outer edges (18c, 19c) of the flanges (18,19), wherein - when the cap is secured on the neck - the inner surface, at least a portion thereof, of the tamper-evident ring member abuts one or both outer edges (18c, 19c) of the upper flange and of the lower flange, preferably the outer edge of the upper flange, more preferably the outer edges of both the upper and lower flange.

6. Closure assembly according to claim 5, wherein at least a portion of the inner surface of the tamper-evident ring member at and / or in proximity of each retention window (52) abuts outer edges (18c, 19c) of the upper flange (18) and of the lower flange (19).

7. Closure assembly according to any one or more of claims 1 - 6, wherein the spout comprises at least one flange, e.g. a lower flange (18) and an upper flange (19) which arespaced apart, wherein each flange protrudes outwardly from the exterior of the neck and, wherein each flange (18,19) has an outer edge (18c, 19c),wherein the one or more retention members (14) extend radially beyond the outer edge (18c, 19c) of each flange (18,19), wherein - when the cap is secured on the neck - the inner surface, at least a portion thereof, of the tamper-evident ring member abuts one or both outer edges (18c, 19c) of the upper and lower flange (18,19), and wherein - when the cap is secured on the neck - the engagement surfaces (15, 53) of the retention member and of the retention window are spaced apart in rotational direction, and wherein each retention window comprises a downward urging portion (54), such that - when the cap is rotated in the opening direction (O) for the first time - the tamper-evident ring member (50) is rotated such that the engagement surfaces come closer to one another and the retention member (14) and the downward urging portion (54) are brought into engagement causing the retention member and the downward urging portion to interact such that the tamper-evident ring member is urged in a downward direction with respect to the flanges (18,19).

8. Closure assembly according to claim 7, wherein the contour of the retention window (52) comprises an upper edge (52a), a lower edge (52b), and two side edges (52c, d), wherein the downward urging portion (54) is embodied as an upwardly inclined surface portion of the lower edge of the retention window, preferably wherein the upwardly inclined surface portion extends to the engagement surface of the retention window.

9. Closure assembly according to claim 7 or 8, wherein the one or more retention members (14) each comprise a downward urging portion (14a), wherein - when the cap is rotated in the opening direction for the first time - the corresponding downward urging portions (54, 14a) of the one or more retention windows and the respective retention members are brought into engagement and interact such that the tamper-evident ring member is urged in a downward direction with respect to the flanges (18,19), preferably wherein the downward urging portions of the one or more retention members are downwardly inclined surfaces configured to engage the upwardly inclined surface portions of the retention windows.

10. Closure assembly according to any one or more of claims 1 - 9, wherein the spout comprises multiple anti-compression ribs (20) which each extend outward from the neck, preferably wherein all anti-compression ribs extend parallel to one another, e.g. in a direction perpendicular to the vertical plane of symmetry (S) of the attachment portion (17), wherein the anti-compression ribs each have an outer end (20c), wherein the outer ends of two or moreanti-compression ribs abut an inner surface (50a) of the tamper-evident ring when the cap is secured on the neck,11. Closure assembly according to claim 10, wherein two diametrically opposed and aligned anti-compression ribs (20) are provided, wherein two retention members (14) are arranged diametrically opposed from each other such that the two anti-compression ribs and the two retention members are arranged evenly about the circumference of the neck, e.g. spaced radially 90 degrees apart from each other.

12. Closure assembly according to any one or more of claims 1 - 11, wherein the spout comprises an upper flange (19), wherein the upper flange comprises a downward facing surface (19b), wherein the tamper-evident ring member comprises an inner surface (50a) and an outer surface (50b), wherein the tamper-evident ring member further comprises one or more axial constraining portions (55), wherein the one or more axial constraining portions comprise an inner surface (55a) and an outer surface (55b), wherein the inner surface (55a) of each axial constraining portion defines an inwardly protruding ridge (56), wherein - when the cap is secured to the neck - the ridge abuts the downward facing surface (19b) of the upper flange (19),13. Closure assembly according to claim 12, wherein the outer surface (55b) of the axial constraining portion defines an inwardly protruding indentation (57).

14. Closure assembly according to any one or more of claims 1 - 13, wherein the exterior side of the neck and the interior side of the skirt are provided with cooperating angular positioning members (21, 22) which define a predetermined angular position of the cap body with respect to the neck when the cap is rotationally secured to the neck in the closed position, wherein the predetermined angular position is such that the one or more retention members are retained in a corresponding retention window,15. Closure assembly according to claim 14, wherein each angular positioning member on the exterior side of the neck is arranged directly above a respective retention member (14).

16. Closure assembly according to any one or more of claims 1 - 15, wherein each of the one or more retention members has a ramp surface (23) which is configured to flex the tamper-evident ring member outwards during the process of securing the cap on the neck of the spout, and / or wherein the tamper-evident ring member has - when viewed in a horizontalcross-section - a portion with an increased thickness (50c) at and in the proximity of the engagement surface of each of the retention windows.

17. A closure assembly (1) comprising:- a spout (10) which is made, e.g. moulded, of a plastic material, wherein the spout comprises an attachment portion (17) configured to be secured to a container body and wherein the spout comprises a neck (11) around a product passage (12) in the spout, the neck having a main axis (13) and forming a mouth at a top end of the product passage, and wherein the neck has an exterior side;- a cap (2), preferably a screw cap, which is made, e.g. moulded, of a plastic material and which is secured or to be secured on the neck (11) of the spout, wherein the cap seals the product passage (12) in a closed position of the cap on the neck, wherein the cap comprises a cap body (30) which is configured to be removed from the neck of the spout by a user in a rotational opening direction (O),wherein the cap body (30) comprises a top wall structure (31) and a downward depending skirt (32), the skirt having an interior side, an exterior side, and a lower edge remote from the top wall structure, wherein the exterior side of the neck (11) and the interior side of the skirt comprise cooperating connection means (33a, 33b), preferably screw threads,wherein the cap further comprises a tamper-evident ring member (50) which is integrally formed to the lower edge of the skirt (32), wherein the tamper-evident ring member is connected to the lower edge of the skirt via one or more breakable bridges (51), wherein the tamper-evident ring member is non-frangible,wherein the spout comprises one or more retention members (14), and wherein the tamper-evident ring member defines one or more retention windows (52), each retention window having a closed contour (52a,b,c,d), and wherein each retention window is configured to retain therein a respective one of the retention members, such that the tamper-evident ring member is axially and rotationally constrained with respect to the neck when the cap is secured on the neck,wherein each of the one or more retention windows (52) comprises a downward urging portion (54), wherein - when the cap (2) is rotated in an opening direction (O) for the first time - the tamper-evident ring member (50) is rotated such that each retention member (14) andthe respective downward urging portion (54) are brought into engagement and the retention member (14) and the downward urging portion (54) interact causing the tamper-evident ring member to be urged in a downward direction with respect to the spout (10).

18. Closure assembly according to claim 17, wherein - when the cap (2) is rotated in an opening direction (O) for the first time - the tamper-evident ring member (50) is moved between 0.2 mm and 1 mm downwards with respect to the neck.

19. Closure assembly according to claim 17 or 18, wherein the closed contour of the retention window (52) comprises an upper edge, a lower edge, and two side edges, wherein the downward urging portion (54) is embodied as an upwardly inclined surface portion of the lower edge of each of the one or more retention windows (52).

20. Closure assembly according to any one or more of claims 17- 19, wherein the retention member (14) comprises a corresponding downward urging portion (14a), wherein -when the cap is rotated in an opening direction (O) for the first time - the corresponding downward urging portions (54) of the one or more retention windows (52) and a respective retention member (14) are brought into engagement and interact such that the tamper-evident ring member (50) is urged in a downward direction with respect to the neck.

21. Closure assembly according to any one or more of claims 17-20, wherein the spout comprises one or more flanges (18,19) which each protrude outwardly from the exterior of the neck, wherein the one or more flanges have an upward facing surface, a downward facing surface, and an outer edge (18c, 19c), wherein the one or more retention members are arranged in proximity of the one or more flanges (18,19) and extend radially beyond the outer edge of the one or more flanges (18,19), and wherein- when the cap is secured on the neck - an inner surface of the tamper-evident ring member abuts the outer edge (18c, 19c) of at least one of the one or more flanges.

22. Closure assembly according to any one or more of claims 17 - 21 , wherein the spout comprises a lower flange (18) and an upper flange (19) which are vertically spaced apart, wherein the one or more retention members (14) are arranged between the lower flange and the upper flange, and wherein, when the cap is secured on the neck, the inner surface, at least a portion thereof, of the tamper-evident ring member (50) abuts one or both of the outer edges (18c, 19c) of the upper flange (18) and the lower flange (19).

23. Closure assembly according to any one or more of claims 17-22, wherein the tamper-evident ring member (50) comprises an inner surface and an outer surface, wherein the tamper-evident ring member further comprises one or more axial constraining portions (55), wherein an inner surface of the axial constraining portion defines an inwardly protruding ridge (56), wherein - when the cap is secured to the neck - the ridge abuts a downward facing surface of the upper flange.

24. Closure assembly according to any one or more of claims 17-23, wherein one of the one or more breakable bridges (51) is arranged directly above a retention window (52), preferably wherein one breakable bridge is arranged directly above each retention window.

25. A container provided with a closure assembly according to any one or more of claims 1 -24, e.g. a collapsible pouch container, e.g. wherein the attachment portion is secured between opposed film walls of the collapsible pouch container, or between cartons, or on a carton.

26. Method for manufacturing either a closure assembly according to one of claims 1 -24 or a container according to claim 25, comprising the steps of:- providing the spout,- injection moulding the cap with integral tamper-evident ring,- securing the cap with integral tamper-evident ring on the neck of the spout.

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