SE2251023A1

SE2251023A1 - Bottle closure and bottle provided with such closure

Info

Publication number: SE2251023A1
Application number: SE2251023A
Authority: SE
Inventors: Micael Svensson
Original assignee: Modulpac Ab
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2024-03-06
Also published as: EP4332013A1

Abstract

A bottle closure (14) comprises a screw cap (16) and a tamper-evident rim (18). The screw cap (16) comprises an axial closure wall (28) configured to close an orifice (24) of the bottle spout (20), and a cap skirt (30) configured to engage with an external thread (22) of the bottle spout (20), and translate the screw cap (16) along a screw axis (A) by rotating about the screw axis. The bottom rim (32) of the cap skirt (30) is releasably connected to the tamper-evident rim (18), via a frangible bridge arrangement, along a screw cap separation line, which extends in a plane perpendicular to the screw axis (A). The tamper-evident rim (18) comprises an attachment ring (36) configured to rotatably and non-detachably engage with the bottle spout (20); and a tether band (38) tethering the screw cap (16) to the attachment ring (36), wherein the tether band (38) is configured to be resiliently bent radially outwards from the screw axis (A) against a bias.

Description

BOTTLE CLOSURE AND BOTTLE PROVIDED WITH SUCH CLOSURE Field of the invention The present invention relates to a bottle closure comprising a screw cap and a tamper-evident rim, and to a plastic bottle provided with such a closure.

Background Plastic bottles with screw caps are often used for liquid food products, and in particular, for liquid food products intended to be consumed on the go, such as carbonated soft drinks. Due to the high volumes in which such bottles are produced, it is desirable that the screw cap be produced at low cost and with low environmental impact. For example, it may be desired that the screw cap be tethered to the bottle to reduce the risk of loss and littering. Moreover, bottle spouts are highly standardized, and bottle closure applicator machinery is typically fine-tuned to a specific design of closures and bottle spouts with high precision. lt may therefore also be desired that the bottle closure be possible to use in existing bottle closure applicator machinery without modifications thereto. At the same time, the closure should preferably be easy to use, should not interfere with the stream from the spout while pouring or drinking, and should work not only in theory but also in practice. US 2022/0002021 A1 suggests a tethered screw cap configured to be attached to a plastic bottle, and also addresses the standard PCO 1881. There is however a need for a further improved screw cap.

Summary lt is an object of the present invention to solve, or at least mitigate, parts or all of the above mentioned problems. To this end, according to a first aspect, there is provided a bottle closure configured to be attached to a bottle spout, the bottle closure comprising a screw cap and a tamper-evident rim extending axially along a circular-cylindrical envelope, wherein the screw cap comprises an axial closure wall configured to close an orifice of the bottle spout, the axial closure wall having a top face which faces in an upwards axial direction; and a cap skirt extending from the axial closure wall in a downwards axial direction to a bottom rim of the cap skirt, the cap skirt being provided with an internal thread configured to engage with an external thread of the bottle spout by rotating about a screw axis and thereby translate the screw cap along the screw axis, wherein the bottom rim of the cap skirt extends about the screw axis along a circumferential screw cap separation line in a plane perpendicular to the screw axis, the screw cap separation line spanning, in said plane, an angle of at least 330° about the screw axis, wherein the bottom rim is releasably connected to the tamper-evident rim via frangible bridge arrangement along the screw cap separation line, wherein the tamper-evident rim comprises an attachment ring configured to rotatably and non-detachably engage with the bottle spout, and a single tether band tethering the screw cap to the attachment ring, wherein the tether band is configured to, after the frangible bridge arrangement has been broken, be resiliently bent radially outwards from the screw axis against a bias. Thereby, when unscrewed from the bottle spout, the screw cap may be twisted about the tether band to a position in which the top face of the axial closure wall extends along the screw axis and/or axially downwards. ln this position, radial bias of the tether band will press the cap towards the bottle, such that a stable position of the cap which does not obstruct the spout opening of the bottle may be obtained. The circular-cylindrical envelope defines a cylindrical coordinate system about the screw axis, the coordinate system being anchored to the bottle spout, and thereby also defines a radial direction, and a circumferential direction, i.e. azimuth, which may be referred to hereinbelow. Preferably, the bottle closure is free from any structures extending outside the circular-cylindrical envelope. This facilitates use of the bottle closure in existing bottle closure applicator machinery adapted for e.g. untethered screw caps designed for bottle spouts pursuant to PCO 1810 or PCO 1881. Moreover, by arranging the screw cap separation line in a plane perpendicular to the screw axis, a high geometric similarity with untethered screw caps is obtained, which minimizes any tooling modifications for producing tethered screw caps. According to embodiments, the tamper-evident rim may have a smooth radially outer face, and the cap skirt may have a radially outer face which is provided with friction ribs extending in the axial direction, parallel to the screw axis. Preferably, the cap skirt has a uniform axial height along its circumference. Thereby, again, a high geometric similarity with untethered screw caps may be maintained, which minimizes modifications to existing machinery for producing and applying bottle closures. Similarly, and for the same reasons, the tamper-evident rim preferably has a uniform width in the axial direction along its circumference. The screw cap may extend along a first axial segment of the circular-cylindrical envelope, and the tamper-evident rim may extend along a second axial segment of the circular-cylindrical envelope, wherein the second axial segment does not overlap with the first axial segment. Each of the attachment ring and the 2 tether band may extend along the circular-cylindrical envelope. According to embodiments, the tether band may be axially separated from the attachment ring along a tether band separation line, optionally via one or more frangible bridges. The frangible bridge arrangement may comprise a plurality of discrete bridges, or an elongate, continuous bridge which defines a tear line. Preferably, the bottom rim of the screw cap is integrally formed with the tamper-evident rim and the frangible bridge arrangement. The attachment ring may be configured to non-detachably mate with a track extending about the circumference of the bottle spout. For example, a radially inner face of the attachment ring may be provided with a set of circumferentially distributed barbs configured to engage with a circumferential bead of the spout. The barbs may be configured as tabs extending radially inwards, wherein the tabs have free ends which are configured to flex in the radial direction. A bottom face of the axial closure wall may be provided with a circular bore seal configured to extend into the spout and engage with a radially inner face of the spout. According to embodiments, the screw cap separation line may span an angle of more than 340° about the screw axis.

According to embodiments, the tamper-evident rim may comprise a first circumferential section and a second circumferential section different from said first circumferential section, wherein the tether band is non-detachably connected to the bottom rim of the screw cap at a screw cap interface at a first circumferential position, and to the attachment ring at an attachment ring interface at a second circumferential position different from said first circumferential position, and extends along the attachment ring, from the screw cap interface to the attachment ring interface, in a first circumferential direction along the entire length of said first circumferential section of the tamper-evident rim. The first circumferential section may correspond to the axial overlap of the screw cap separation line and the tether band separation line. Preferably, said first circumferential section spans an angle about the screw axis of between 50° and 90°.

According to embodiments, the internal thread of the cap skirt is right-handed, such that the screw cap is configured to be unscrewed in an anticlockwise unscrewing direction as seen in the downwards axial direction, and said first circumferential direction is said unscrewing direction. Such a direction of the tether band facilitates breaking any frangible bridges connected to the tether band when opening the closure. Moreover, strain exposure to the frangible bridges when applying the closure to the bottle spout during manufacture will be minimized. 3 Thereby, the frangible bridges may be designed to have a lower strength, which also facilitates opening. Preferably, the screw cap may be configured to be twisted about the tether band in an anti-ciockwise direction after opening, as seen from the screw cap towards the screw axis; thereby, the screw cap will be twisted to a lower overall position on the side of the bottle neck.

According to embodiments, at least one of the screw cap interface and the attachment ring interface may have a width in the circumferential direction of less than 6 mm. Thereby, tvvisting of the tether band about an axis tangential to the circular-cylindrical envelope may be facilitated. According to embodiments, said at least one of the screw cap interface and the attachment ring interface may have a width in the circumferential direction of more than 1,5 mm; for example, between 1,5 mm and 4,5 mm.

According to embodiments, at least one of the screw cap interface and the attachment ring interface may, in a section perpendicular to the screw axis, have a shape which is not reflection-symmetric about a radial axis. Thereby, bending the screw cap interface or the attachment ring interface about a bending axis which, initially, extends in the circumferential direction, will tend to deflect the bending axis from the circumferential direction as the degree of bending increases. Such a bending axis deflection may increase the radial bias of the screw cap towards the screw axis when bending said at least one of the screw cap interface and the attachment ring interface. By way of example, the cross-sectional shape of said at least one of the screw cap interface and the attachment ring interface may be the shape of a non-rectangular quadrilateral such as a non-rectangular parallelogram.

According to embodiments, the attachment ring and the tether band may together span a total axial width at the first circumferential section which is substantially the same as an axial width of the attachment ring at the second circumferential section. Here, substantially the same should be construed as being between 80% and 120% of the axial width of the attachment band at the second circumferential section. Said total axial width may, for example, be between 3,3 mm and 3,8 mm, excluding any circumferentially intermittent axial support ridges, as the case may be.

According to embodiments, at said first circumferential section, an axial width of the tether band differs from an axial width of the attachment ring by less than 40%.

For example, the axial width of the attachment ring may be between 10% and 30% greater than the axial width of the tether band at said first circumferential section. 4 According to embodiments, the tether band may be configured to be separated from the attachment ring along a tether band separation line defined by a circumferential separation line section extending in the circumferential direction from the attachment ring interface to the screw cap interface, and, at the screw cap interface, a transversal separation line section extending from the circumferential separation line section to the screw cap separation line. According to embodiments, the circumferential separation line section extends at or adjacent to the axial centre of the tamper-evident rim. According to embodiments, the tether band separation line may curve, at the screw cap interface, towards the screw cap separation line with an outer radius of curvature of between 0,5 mm and 2 mm. Thereby, a high mechanical strength of the attachment ring may be obtained.

According to embodiments, the tether band separation line may extend from the screw cap separation line to a tether band separation line end wall at the attachment ring interface, wherein a projection of the tether band separation line end wall on the circular-cylindrical envelope may have a radius of curvature of between 0,15 mm and 0,60 mm. Thereby, a high mechanical strength of the attachment ring interface may be obtained.

According to embodiments, the tether band may have an axial width of between 0,90 mm and 1,45 mm. Such an axial width provides a particularly suitable degree of flexibility in the axial direction for positioning the twisted screw cap on the side of the bottle spout. Moreover, the axial width range facilitates twisting the screw cap about the tether band. According to further examples, the tether band may have an axial width of between 1,10 mm and 1,30 mm.

According to embodiments, the tether band may have a radial width of between 0,90 mm and 1,45 mm. Such a radial width provides a particularly suitable degree of resilience in the radial direction for biasing the screw cap against the bottle spout. According to further examples, the tether band may have a radial width of between 1,10 mm and 1,30 mm.

According to embodiments, the tether band may comprise a hinge. A hinge provides intuitive guidance to the user with regard to how to twist the screw cap. The hinge may be configured as a living hinge and may, for example, be configured as a bend indication or dent in the tether band. The hinge may define one of a screw cap interface and an attachment ring interface.

According to embodiments, the hinge may be configured to enable the screw cap to, once unscrewed, be pivoted in relation to the attachment ring about a hinge axis of the tether band which, at least prior to breaking the frangible bridge arrangement, is substantially perpendicular to the screw axis. Here, substantially perpendicular to the screw axis should be construed as being inclined by more than 70 degrees to the screw axis.

According to embodiments, a dista| end of the tether band may comprise the hinge and a proximal end of the tether band may be connected to the attachment ring. (here, the term "proximal end" should be construed as the end connected to the attachment ring, and the term "dista| end" should be construed as the end connected to the screw cap.

According to embodiments, the hinge may be defined by a bending indication formed in a radially outer face of the tether band. Thereby, once the screw cap has been unscrewed and moved to a radial position where it is free to be twisted about the tether band, the hinge will facilitate pivoting the screw cap axially downwards, and to at least some degree resist pivoting the screw cap axially upwards. Such an arrangement serves to guide the consumer to twist the screw cap in the right direction to correctly position the screw cap, because the shape of the hinge will make it easier to pivot the screw cap downwards than upwards about the hinge. According to embodiments, the hinge may have a width in the radial direction of between 0,5 mm and 0,9 mm.

According to embodiments, a proximal end of the tether band may have a uniform radial thickness and be free from any hinge.

According to embodiments, the tether band may have a length along the circumferential direction corresponding to an angular distance about the screw axis of between 50° and 90°. Such a length results in a well-defined and stable position of the twisted screw cap when opened. For a bottle closure adapted for a PCO 1810 spout, this corresponds to a length of the tether band, along the circumferential direction, of about 14-25 mm. More preferably, the tether band has a length along the circumference of the circular-cylindrical envelope corresponding to an angular distance of between 65° and 85°.

According to embodiments, the attachment ring, the frangible bridge arrangement, and the tether band may be integrally formed with the screw cap. Thereby, a particularly well-defined bias of the twisted screw cap, when in the open position, may be obtained. For example, the attachment ring, tether band and screw cap may be injection moulded. Exemplary suitable materials for the bottle closure are polypropylene and polyethylene terephthalate. 6 According to embodiments, the frangible bridge arrangement may comprise a plurality of frangible bridges joining the screw cap with the attachment ring.

According to embodiments, the frangible bridge arrangement may comprise at least one tether band bridge frangibly joining the tether band with one of the attachment ring and the bottom rim of the cap skirt. According to embodiments, the frangible bridge arrangement may comprise frangible bridges joining the tether band with both of the bottom rim of the cap skirt and the attachment ring. Alternatively, the frangible bridge arrangement may join the tether band with only one of the attachment ring and the bottom rim of the cap skirt, i.e. the frangible bridge arrangement may be free from any tether band bridges frangibly joining the tether band with the other of the attachment ring and the bottom rim or the cap skirt.

According to embodiments, said at least one tether band bridge may be positioned at a respective circumferential position along the tether band, and at the respective circumferential position, there is no frangible bridge joining the tether band with the other of the attachment ring and the bottom rim of the cap skirt. By not having frangible bridges both upwards and downwards from the tether band at the same circumferential position(s), the axial load on the attachment ring in the circumferential section shared with the tether band may be reduced when unscrewing the screw cap, which reduces any stretching of the attachment ring when unscrewing the screw cap. This may be particularly desirable in combination with a small cross-section of the attachment ring.

According to embodiments, the frangible bridge arrangement may comprise no more than three tether band bridges frangibly joining the tether band with any of the attachment ring and the bottom rim of the cap skirt. Such a number of frangible bridges reduces any stretching of the attachment ring when unscrewing the screw cap.

According to embodiments, the tether band may be shaped to have a tensile strength of at least 12 N. More preferably, the tether band is shaped to have a tensile strength of at least 20 N. By way of example, the tether band may be shaped to have a tensile strength of between 20 N and 40 N.

According to embodiments, the tether band may be configured to, after the frangible bridge arrangement has been broken, be resiliently bent radially outwards from the screw axis against a bias, directed radially inwards, of between 0,35 N and 1,8 N, measured at a distal end of the tether band. According to further embodiments, the bias may be between 0,5 N and 1,5 N. 7 According to embodiments, the bottle closure may be injection-moulded of a polymer material comprising at least 75% polypropylene. Such a material facilitates obtaining a suitable balance between dimensions and resilience of the tether band.

According to embodiments, the polymer material may have a ﬂexural modulus exceeding 1,3 GPa, for example between 1,3 GPa and 1,8 GPa. Alternatively or additionally, the polymer material may have a Young's modulus of between 0,9 and 1,7 GPa.

According to embodiments, the circular-cylindrical envelope may have an outer diameter of between 29 mm and 34 mm. For example, the bottle closure may be configured to mate with a bottle spout pursuant to PCO 1810 OR PCO 1881.

According to embodiments, the circular-cylindrical envelope may have an axial length of between 15 mm and 25 mm.

According to a second aspect, there is provided a bottle comprising a bottle closure as defined hereinabove. According to embodiments, the bottle may be made of polyethylene terephthalate. The bottle may have a threaded bottle spout, wherein the threads have an outer, i.e. major, diameter of between 27 mm and 29 mm. For example, the bottle spout may have a shape pursuant to PCO 1810 or PCO 1881 as defined by the International Society of Beverage Technologists, ISBT. lt is noted that embodiments of the invention may be embodied by all possible combinations of features recited in the claims. Further, it will be appreciated that the various embodiments described for the bottle closure according to the first aspect are all combinable with the bottle according to the second aspect, and vice versa.

Brief description of the drawinqs The above, as well as additional objects, features and advantages of the present invention, will be better understood through the following illustrative and non- limiting detailed description of preferred embodiments of the present invention, with reference to the appended drawings, where the same reference numerals will be used for similar elements, wherein: Fig. 1 is a perspective view of a bottle closure attached to the spout of a bottle; Fig. 2 is a perspective view of the bottle closure of Fig. 1 prior to application to the bottle spout; Fig. 3 is a side view of the bottle closure and bottle spout of Fig. 1 after application to the bottle spout; Fig. 4 illustrates a section of the bottle closure of Fig. 3, the section taken along the plane indicated by IV-IV in Fig. 3; Fig. 5 illustrates a section of the bottle closure of Fig. 3, the section taken along the plane indicated by V-V in Fig. 3; Fig. 6 illustrates a section of the bottle closure of Fig. 3 prior to application to the bottle spout, the section taken along the plane indicated by Vl-Vl in Fig. 4; Fig. 7 illustrates a section of the bottle spout and bottle closure of Fig. 3, the section taken along the plane indicated by Vl-Vl in Fig. 4; Fig. 8 is a side view of the bottle closure and bottle spout of Fig. 3 after unscrewing a screw cap of the bottle closure from the bottle spout; Fig. 9 is a perspective view of the bottle closure and bottle spout of Fig. 8 after moving the screw cap to the side of the bottle spout against the bias of a tether band; Fig. 10 is a perspective view of the bottle closure and bottle spout of Fig. 9 after twisting the screw cap about the tether band to a first twisted position; and Fig. 11 is a perspective view of the bottle closure and bottle spout of Fig. 10 after twisting the screw cap about the tether band to a second twisted position.

All the figures are schematic, not necessarily to scale, and generally only show parts which are necessary in order to elucidate the embodiments, whereas other parts may be omitted.

Detailed description of the exemplarv embodiments Fig. 1 illustrates a bottle 10 made of polyethylene terephthalate, as frequently used for beverages intended for immediate consumption. The bottle 10 comprises a neck 12, an upper end of which defines a bottle spout for pouring or drinking the content of the bottle 10, and a bottle closure 14 is arranged on the spout. The bottle closure 14 comprises a screw cap 16 and a tamper-evident rim 18, which are integrally formed in one piece of polypropylene by injection moulding.

Fig. 2 illustrates the bottle closure 14 and the bottle spout 20 in greater detail, wherein the bottle closure 14 is illustrated separate from the bottle spout 20. The screw cap 16 and the tamper-evident rim 18 extend along a common, circular- cylindrical envelope which is symmetric about a screw axis A. The circular-cylindrical envelope has an outer diameter of about 32 mm, and the bottle closure 14 has an axial length of about 20 mm. The bottle spout is shaped pursuant to the PCO 1810 standard as defined by the International Society of Beverage Technologists, ISBT, and is provided with a right-handed outer thread 22 having an outer diameter of 9 about 28 mm. Even though not visible in the view of Fig. 2, the screw cap 16 is provided with an inner right-handed thread mating with the thread 22 of the bottle spout 20, to enable the screw cap 16 to translate along the screw axis A by rotating on the thread 22 of the bottle spout 20.

The circular-cylindrical envelope of the bottle closure 14 defines a cylindrical coordinate system about the screw axis A, with an axial or longitudinal direction along the screw axis A, a radial direction along a polar axis perpendicularly away from the screw axis, and a circumferential direction or azimuth perpendicular to the radial direction and the screw axis, along an angular axis of the cylindrical coordinate system. The bottle spout 20 is substantially circular-cylindrical, with its axis of symmetry coinciding with the screw axis A, and has a circular orifice 24 defined by an axially facing, circumferential rim 26 of the bottle spout 20.

The screw cap 16 comprises an axial closure wall 28 closing, when the closure 14 is applied to the bottle spout 20, the orifice 24 of the bottle spout 20 in a liquid-tight manner. The axial closure wall 28 has a top face 28a which faces in an upwards axial direction, i.e. away from the bottle spout 20. The screw cap 16 further comprises a cap skirt 30 extending from the axial closure wall in a downwards axial direction to a bottom rim 32. Circumferentially distributed friction ribs 34, extending in the axial direction A, cover a radially outer face of the cap skirt 30 and provide a good grip with the fingers when unscrewing the screw cap 16. The bottle closure is however free from any structures extending outside the circular-cylindrical envelope, such that bottle closures 14 of the illustrated type can be efficiently handled in commonly used screw cap applicator machines without getting entangled with each other.

The tamper-evident rim 18 comprises an attachment ring 36 configured to non-detachably engage with the bottle spout 20, and a tether band 38 non- detachably tethering the screw cap 16 to the attachment ring 36. The bottle closure 14 is applied to the bottle spout 20 by screwing onto the bottle spout 20 to an axial position where the attachment ring 36 is trapped in a circumferential track 39 between a lower circumferential collar 40 and an upper circumferential bead 42 of the bottle spout 20. The tamper-evident ring 18 is axially separated from the screw cap 16 by an upper recess 44, which defines an upper tear indication for axially separating the screw cap 16 from the tamper-evident rim 18 when opening the bottle closure 14. The upper tear indication extends in the circumferential direction along a screw cap separation line in a plane perpendicular to the screw axis A. Similarly, a lower recess 46 defines a lower tear indication for axially separating the tether band from the attachment ring 36. The lower tear indication extends in the circumferential direction along a tether band separation line in a plane perpendicular to the screw axis A. Apart from the lower recess 46, the tamper-evident rim 18 has a smooth radially outer face.

The side view of Fig. 3 is better suited for illustrating certain features of the bottle closure 14. The screw cap 16 extends along a first, upper axial segment A1 of the circular-cylindrical envelope, and has an axial width H1 of about 15 mm. Similarly, the tamper-evident rim 18 extends along a second, lower axial segment A2 of the circular-cylindrical envelope, and has an axial width H2 of about 3,5 mm. The first and second axial segments A1, A2 do not axially overlap. The tamper-evident rim 18 is axially joined with the bottom rim 32 of the screw cap 16 via a first set of frangible bridges 48, four of which are pointed out in the view of Fig. 3. Similarly, the tether band 38 is axially joined with the attachment ring 36 via a second set of frangible bridges 50; in the illustrated example, the second set comprises a single frangible bridge 50 only. As can be seen, none of the frangible bridges 48 of the first set are at the same circumferential position as the frangible bridge 50 of the second set. While the screw cap 16 is reclosable, i.e. repeatedly movable between the fully closed position of Fig. 1, in which it closes the orifice 24 (Fig. 2), and a fully open position allowing a person to drink directly from the orifice 24, the frangible bridges 48, 50 are broken the first time the screw cap 16 is opened, and thereby serve as a tamper evidence.

A non-frangible screw cap interface 52 connects the tether band 38 to the bottom rim 32 of the screw cap 16 in the axial direction, and a non-frangible attachment ring interface 54 connects the tether band 38 to the attachment ring 36. Thereby, the tether band 38 extends from a proximal end 38a at the attachment ring interface 54 to a distal end 38b at the screw cap interface 52. Axial support ridges 56 extend circumferentially along the upper axial face of the tamper-evident rim 18, facing the screw cap 16. The axial support ridges 56, which are not joined with the screw cap 16, support the screw cap 16 such that the risk of damage to the frangible bridges 48, 50 during application of the bottle closure 14 to the bottle spout 20 is reduced. At the same time, the axial support ridges 56 are intermittently distributed along the tamper-evident rim 18, and have a radial width which is substantially smaller than the attachment ring 36 and the tether band 38. As such, they do not 11 considerably contribute to the mechanical strength or resilience of the attachment ring 36 or tether band 38.

When unscrewing the screw cap 16 from the bottle spout 20, the bottom rim 32 of the screw cap 16 will axially separate from the tether band 38 along the screw cap separation line S1. lt will also axially separate from the attachment ring 36 along the tether band separation line S2. The tether band separation line S2 comprises a circumferential separation line section S2a extending in the circumferential direction, in a plane perpendicular to the screw axis A, from the attachment ring interface 54 to the screw cap interface 52, and, at the screw cap interface 52, a transversal separation line section S2b extending from the circumferential separation line section S2a to the screw cap separation line S1. The circumferential separation line section S2a extends approximately at the axial centre of the tamper-evident rim 18. At the screw cap interface 52, the tether band separation line S2 curves towards the screw cap separation line S1 with an outer radius of curvature r of about 1 mm. At the opposite end, i.e. at the attachment ring interface 54, the tether band separation line S2 has a tether band separation line end wall 55, wherein a projection of the tether band separation line end wall 55 on the circular-cylindrical envelope has a radius of curvature of about 0,3 mm.

Fig. 4 illustrates a section along the plane indicated by IV-IV in Fig. 3, immediately above the axial support ridges 56. The screw cap separation line S1 spans an angle a1 of about 345° about the screw axis, while the screw cap interface 52 represents the remaining angle a2 of about 15°, corresponding to a width W1 in the circumferential direction of about 3 mm. The radial width W2 of the tether band 38, as well as of the attachment ring 36, is about 1,2 mm, while the radial width W3 of the screw cap attachment interface 52 is about 0,7 mm, i.e. slightly more than half the radial width W2 of the tether band 38. The reduced material thickness at the screw cap interface 52 forms a bending indication defining a living hinge 53, which will be described in greater detail further below. The hinge 53 enables the screw cap 16 (Fig. 3) to, once unscrewed from the bottle spout 20 (Fig. 3), pivot about a hinge axis HA which, at least for small pivot/bending angles, is substantially perpendicular to the screw axis A as well as to the radial direction. The bending indication defining the hinge 53 is formed in the radially outer face of the tether band 38. As apparent from the section of Fig. 4, the hinge 53, which defines the screw cap interface 52, has a cross-sectional shape which is not reflection-symmetric about a radial axis; more precisely, it has the general shape of a non-rectangular parallelogram. 12 Thereby, substantial pivoting of the screw cap 16 downwards about the hinge 53 will tend to shift the pivot axis HA clockwise, as seen from above. The remaining part of the tether band 38, from the hinge 53 to the proximal end at the attachment ring interface 54, has a uniform radial width W2 without any bending indications.

Frangible bridges 48 and axial support ridges 56 are shaped and positioned to enable extraction from an injection moulding tool in a tool extraction direction extending along an extraction line E. One of the frangible bridges 48 is a tether band bridge 48a, which connects the tether band 38 with the bottom rim 32 of the screw cap 16 (Fig. 3).

Fig. 5 illustrates a section in the plane indicated by V-V in Fig. 3, along the tether band separation line 46 immediately below the tether band 38 (Fig. 3). Even though not part of the illustrated section, a broken line indicates the position of the screw cap interface 52. The tether band 38 (Fig. 3) extends along a first circumferential section C1 of the tamper-evident rim from a first circumferential position P1, in an anti-clockwise circumferential direction D, to the attachment ring interface 54 (Fig. 3) at a circumferential position P2. The first circumferential section C1 corresponds to the axial overlap of the screw cap separation line S1 (Fig. 2) and the tether band separation line S2 (Fig. 2). The first circumferential section C1 spans an angle about the screw axis A of about 75°. Thereby, the remaining, second, circumferential section C2 spans an angle about the screw axis A of about 285°. Accordingly, the axially free, or at least axially detachable, segment of the tether band 38 spans an angle in the circumferential direction of about 75° which, for a bottle closure adapted for a PCO 1810 spout, corresponds to a length of the tether band, along the circumferential direction, of about 21 mm.

Fig. 5 also illustrates the frangible bridge 50, which is a tether band bridge connecting the tether band 38 (Fig. 3) with the attachment ring 36.

Fig. 6 illustrates an axial section taken along the extraction line E of Fig. 4, the view indicated by Vl-Vl. The view illustrates the internal thread 58 of the cap skirt 30, and a bore seal 60 extending axially downwards from the lower face of the axial closure wall 28. The bore seal 60 is configured to extend, when the bottle closure 14 is tightly screwed to the bottle spout 20 (Fig. 2), into the orifice 24 (Fig. 2) of the bottle spout 20, and seal against the radially inner wall of the bottle spout 20 in a liquid-tight manner.

As apparent from the view of Fig. 6, at the second circumferential section C2, the attachment ring 36 alone represents the total axial width H2 of the tamper-evident 13 rim 18, whereas at the first circumferential section C1 (see magnified detail), the tether band 38 and the attachment ring 36 together span the total axial width H2 of the tamper-evident band 18. At the first circumferential section C1, the axial width H3 of the tether band 38 is about 1,2 mm, excluding the axial support ridges 56, while the axial width H4 of the attachment ring 36 is about 1,6 mm.

The radially inner face of the attachment ring 36 is provided with a set of circumferentially distributed tabs 62 extending radially inwards. The tabs 62 operate as barbs configured to, when the bottle closure 14 is applied to the bottle spout 20 (Fig. 2) engage with the circumferential bead 42 ofthe spout 20. The tabs 62 have free ends 64 which are configured to flex radially inwards, such that they can pass the circumferential bead 42 when the bottle closure 14 is screwed onto the bottle spout 20, and thereafter permanently lock the attachment ring 36 to the circumferential track 39 (Fig. 2).

The section of Fig. 7, taken along the same plane as that of Fig. 6, illustrates the bottle closure 14 when applied to the bottle spout 20. The tabs 62 permanently lock the attachment ring 36 to the bottle spout 20 in the axial direction A, whereas rotation of the attachment ring 36 in the circumferential direction is permitted. Hence, the screw cap 16 can be unscrewed by turning about the screw axis A, thereby breaking the frangible bridges 50, 48 (Fig. 3) between the tether band 38 and the screw cap 16 as well as the attachment ring 36.

The tether band 38 has a substantially rectangular cross-section and, as noted hereinabove, a width W2 (Fig. 4) in the radial direction of about 1,2 mm and an axial width H3 (Fig. 6) of about 1,2 mm. This gives the tether band 38 a tensile strength of about 30 N, such that inadvertent breakage is unlikely.

Fig. 8 illustrates the closure 14 when the screw cap 16 has been screwed off, having reached a position immediately above the bottle spout 20. The tether band 38 is just long enough to enable the screw cap 16 to reach the illustrated axial position. From the position illustrated in Fig. 8, the screw cap 16 can be moved to the side of the bottle spout 20 by bending the tether band 38 radially outwards from the screw axis A, against a radial bias generated by the tether band 38, to the position illustrated in Fig. 9. Owing to the dimensions of the tether band 38 in combination with the resilient character of the propylene of the closure 14, in the position of Fig. 9, the tether band 38 exerts a force on the screw cap 16 of about 1 N, measured at the position of the hinge 53, towards the cylindrical symmetry axis of the screw cap. While the position of the screw cap 16 in Fig. 9 is stable, the screw cap 16 is too 14 close to the orifice 24 of the bottle spout 20 to enable convenient drinking directly from the bottle. From the position of Fig. 9, the screw cap 16 is configured to be twisted anti-clockwise about the tether band 38, while also bending the living hinge 53 about the hinge axis HA, to arrive at the position illustrated in Fig. 10, in which the top face 28a of the axial closure wall 28 (Fig. 2) is substantially parallel to the screw axis A. The shape of the hinge 53 and the orientation of the hinge axis HA guides the user to twist the screw cap 16 in the correct direction. Also in the position of Fig. 10, bias of the twisted tether band 38 will press the screw cap 16 towards the bottle spout 20, and in particular, against the circumferential collar 40 (Fig. 2), such that a stable position of the screw cap 16 which does not obstruct the orifice 24 of the bottle spout 20 may be obtained. A final stable position may be obtained by twisting the screw cap 16 a bit further anti-clockwise about the tether band 38, to the position of Fig. 11, in which the top face 28a (Fig. 2) of the axial closure wall 28 (Fig. 2) faces downwards along the screw axis A. Also in the position of Fig. 11, bias of the tether band 38 will press the screw cap 16 against the bottle spout 20 to render the position stable.

The invention has mainly been described above with reference to a few embodiments. However, as is readily appreciated by a person skilled in the art, other embodiments than the ones disclosed above are equally possible within the scope of the invention, as defined by the appended patent claims. ln the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

Claims

Claims'

1.A bottle closure (14) configured to be attached to a bottle spout (20), the bottle closure (14) comprising a screw cap (16) and a tamper-evident rim (18) extending axially along a circular-cylindrical envelope, wherein the screw cap (16) comprises an axial closure wall (28) configured to close an orifice (24) of the bottle spout (20), the axial closure wall (28) having a top face (28a) which faces in an upwards axial direction; and a cap skirt (30) extending from the axial closure wall (28) in a downwards axial direction to a bottom rim (32) ofthe cap skirt (30), the cap skirt (30) being provided with an internal thread (58) configured to engage with an external thread (22) of the bottle spout (20) by rotating about a screw axis (A) and thereby translate the screw cap (16) along the screw axis (A), wherein the bottom rim (32) of the cap skirt (30) extends about the screw axis (A) along a circumferential screw cap separation line (S1) in a plane perpendicular to the screw axis (A), the screw cap separation line (S1) spanning an angle (a1) of at least 330° about the screw axis (A), wherein the bottom rim (32) is releasably connected to the tamper-evident rim (18) via a frangible bridge arrangement (48) along the screw cap separation line (S1), wherein the tamper-evident rim (18) comprises an attachment ring (36) configured to rotatably and non-detachably engage with the bottle spout (20); and a single tether band (38) tethering the screw cap (16) to the attachment ring (36), wherein the tether band (38) is configured to, after the frangible bridge arrangement (48) has been broken, be resiliently bent radially outwards from the screw axis (A) against a bias.

2._ The bottle closure (14) according to claim 1, wherein the tamper-evident rim (18) comprises a first circumferential section (C1) and a second circumferential section (C2) different from said first circumferential section (C1), wherein the tether band (38) is non-detachably connected to the bottom rim (32) of the screw cap (16) at a screw cap interface (52) at a first circumferential position (P1), and to the attachment ring (36) at an attachment ring interface (54) at a second circumferential position (P2) different from saidfirst circumferential position (P1), and extends along the attachment ring (36), from the screw cap interface (52) to the attachment ring interface (54), in a first circumferential direction (D) along said first circumferential section (C1) of the tamper-evident rim (18).

3._ The bottle closure (14) according to claim 2, wherein the internal thread (58) of the cap skirt (30) is right-handed, such that the screw cap (16) is configured to be unscrewed in an anticlockwise unscrewing direction as seen in the downwards axial direction, and said first circumferential direction (D) is said unscrewing direction.

4._ The bottle closure (14) according to any of the claims 2-3, wherein at least one of the screw cap interface (52) and the attachment ring interface (54) has a width (W3) in the circumferential direction of less than 6 mm.

5._ The bottle closure (14) according to any of the claims 2-4, wherein at least one of the screw cap interface (52) and the attachment ring interface (54) has, in a section perpendicular to the screw axis (A), a shape which is not reflection- symmetric about a radial axis.

6._ The bottle closure (14) according to any of the claims 2-5, wherein the attachment ring (36) and the tether band (38) together span a total axial width (H3, H4) at the first circumferential section (C1) which is substantially the same as an axial width (H2) of the attachment ring (36) at the second circumferential section (CZ).

7._ The bottle closure (14) according to any of the claims 2-6, wherein, at said first circumferential section (C1), an axial width (H3) of the tether band (38) differs from an axial width (H4) of the attachment ring (36) by less than 40%.

8._ The bottle closure (14) according to any of the claims 2-7, wherein the tether band (38) is configured to be separated from the attachment ring (36) along a tether band separation line (S2) defined by a circumferential separation line section (S2a) extending in a circumferential direction from the attachment ring interface (54) to the screw cap interface (52), and, at the screw cap interface (52), a transversal separation line section (S2b) extending from thecircumferential separation line section (S2a) to the screw cap separation line (S1).

9._ The bottle closure (14) according to claim 8, wherein the tether band separation line (S2) extends from the screw cap separation line (S1) to a tether band separation line end wall (55) at the attachment ring interface (54), wherein a projection of the tether band separation line end wall (55) on the circular-cylindrical envelope has a radius of curvature of between 0,15 mm and 0,60 mm.

10.The bottle closure (14) according to any of the preceding claims, wherein the tether band (38) has an axial width (H3) of between 0,90 mm and 1,45 mm.

11.The bottle closure (14) according to any of the preceding claims, wherein the tether band (38) has a radial width (W2) of between 0,90 mm and 1,45 mm.

12.The bottle closure (14) according to any of the preceding claims, wherein the tether band (38) comprises a hinge (53).

13.The bottle closure (14) according to claim 12, wherein the hinge (53) is configured to enable the screw cap (16) to, once unscrewed, be pivoted in relation to the attachment ring (36) about a hinge axis (HA) of the tether band (38) which, at least prior to breaking the frangible bridge arrangement, is substantially perpendicular to the screw axis (A).

14.The bottle closure (14) according to any of the claims 12-13, wherein a distal end of the tether band (38) comprises the hinge (53) and a proximal end of the tether band (38) is connected to the attachment ring (36).

15.The bottle closure (14) according to any of the claims 12-14, wherein the hinge (53) is defined by a bending indication formed in a radially outer face of the tether band (38).

16.The bottle closure (14) according to any of the preceding claims, wherein a proximal end of the tether band (38) has a uniform radial thickness and is free from any hinge.

17.The bottle closure (14) according to any of the preceding claims, wherein the tether band (38) has a length along the circumferential direction corresponding to an angular distance about the screw axis (A) of between 50° and 90°.

18.The bottle closure (14) according to any of the preceding claims, wherein the attachment ring (36), the frangible bridge arrangement (48), and the tether band (38) are integrally formed with the screw cap (16).

19.The bottle closure (14) according to any of the preceding claims, wherein the frangible bridge arrangement comprises a plurality of frangible bridges (48) joining the screw cap (16) with the attachment ring (36).

20.The bottle closure (14) according to any of the preceding claims, wherein the frangible bridge arrangement comprises at least one tether band bridge (48a, 50) frangibly joining the tether band (38) with one of the attachment ring (36) and the bottom rim (32) of the cap skirt (30).

21.The bottle closure (14) according to claim 20, wherein said at least one tether band bridge (48a, 50) is positioned at a respective circumferential position along the tether band (38), and at the respective circumferential position, there is no frangible bridge joining the tether band (38) with the other of the attachment ring (36) and the bottom rim (32) of the cap skirt (30).

22.The bottle closure (14) according to any of the claims 20-21, wherein the frangible bridge arrangement comprises no more than three tether band bridges (48a, 50) frangiblyjoining the tether band (38) with any of the attachment ring (36) and the bottom rim (32) of the cap skirt (30).

23.The bottle closure (14) according to any of the preceding claims, wherein the tether band (38) is shaped to have a tensile strength of at least 12 N.

24.The closure (14) according to any of the preceding claims, wherein the tether band (38) is configured to, after the frangible bridge arrangement has been broken, be resiliently bent radially outwards from the screw axis (A) against a bias, directed radially inwards, of between 0,35 N and 1,8 N, measured at a distal end of the tether band (38).

25.The closure (14) according to any of the preceding claims, wherein the bottle closure (14) is injection-moulded of a polymer material comprising at least 75% polypropylene.

26.The closure (14) according to any of the preceding claims, wherein the circular-cylindrical envelope has an outer diameter of between 29 mm and 34 mm.

27.The closure (14) according to any of the preceding claims, wherein the circular-cylindrical envelope has an axial length of between 15 mm and 25 mm.

28.A bottle (10) comprising a closure (14) according to any of the preceding claims.