Container system

Abstract

The invention relates to a container system (11) comprising a container (13) having a container body (17), a shoulder (21) which adjoins the upper side of the container body (17), and a circular-cylindrical neck (23) which has a neck edge (25). In addition, the container system comprises a closure means (15) having an outer casing (29), a cover region (33) adjoining an upper side of the outer casing (29), and an inner casing (35). A child-proof lock is achieved in that at least two projections (39) extending in the radial direction are formed on an inner side (37) of the inner casing (35), which projections, in the closed position, latch on two latching elements (41) formed on an outer side of the neck (23), and in that a spring plate (43) generating an axial force is arranged in the inner casing (35).

Description

[0001] 1040-26687 1 06.08.2025

[0002] Container system

[0003] Field of invention

[0004] The invention relates to a container system according to the preamble of claim 1.

[0005] State of the art

[0006] Child-resistant closures, also known as CRC (Child-Resistant Closures), are known from the prior art. These closures cannot be opened by children up to a certain age. Such a closure is part of a container system. The container system typically comprises a container and the child-resistant closure that interacts with the container. The child-resistant function is achieved by requiring the closure to be pressed downwards so that it can be twisted in the opening direction. In another embodiment of a CRC closure, the closure must first be compressed at its outer casing in order to be twisted in the opening direction.

[0007] CRC closures are typically cylindrical screw caps. With a closure that is not rotationally symmetrical in cross-section and is screwed onto a similarly symmetrical container, the problem arises that the outer contours can only partially or not at all be aligned when the CRC closure is screwed on and sealing the container.

[0008] If the closure has an oval design, precise positioning is difficult or even impossible, especially if a tamper-evident seal is present. Since the seal has a certain height that disappears when the container is further closed, the closure must be screwed on tighter to seal the container. This inevitably results in the outer contours of the closure and container no longer aligning.

[0009] Object of the invention

[0010] The disadvantages of the described prior art result in the challenge of ensuring, in a non-rotationally symmetrical container system with a CRC closure, that the outer contours of the container and the closure are covered and, at the same time, that the container is sealed by the closure during resealing. 1040-26687 2 06.08.2025

[0011] Description

[0012] The problem is solved in a container system by the features listed in the characterizing section of claim 1. Further developments and / or advantageous embodiments are the subject of the dependent claims.

[0013] The invention is characterized in that at least two radially extending projections are formed on an inner surface of the inner sleeve, which, in the closed position, engage with at least two detent elements formed on an outer surface of the neck. Each projection is a protruding, projecting, or protruding component of the inner sleeve. Each detent element, designed to receive the respective projection, is geometrically corresponding to that projection. Furthermore, the invention is characterized in that a spring plate generating an axial force is arranged in the inner sleeve, which, in the closed position, pulls the projections upwards towards the detent elements and presses the spring plate against the neck edge.This means that in the closed position, the spring plate presses the protrusions against the locking elements and the spring plate itself against the neck edge on one underside. Surprisingly, the spring plate can perform two functions simultaneously.

[0014] Firstly, the child safety lock, which is implemented by the locking protrusions and latching elements that engage in a form-fitting manner in the locked position, can be deactivated. To do this, the lock must be pressed downwards against the axial force generated by the spring plate. This releases the locking elements and the protrusions, allowing the lock to be rotated.

[0015] Secondly, in the closed position, the spring plate presses against the neck edge, creating a seal between the neck edge and the spring plate. To improve the seal, it is advisable to place a sealing element made of a compressible sealing material on the underside of the spring plate.

[0016] In a further preferred embodiment of the invention, a retaining element is arranged on the inside of the inner sleeve between the top surface and the projections, which holds the spring plate in the inner sleeve. The retaining element allows the spring plate to be axially displaceable within the inner sleeve, enabling it to spring back against the top surface and press against the retaining element 1040-26687 3 06.08.2025. Furthermore, the retaining element increases the stability of the inner sleeve. In particular, the retaining element is designed as part of the inner sleeve and is therefore particularly easy to provide during the manufacturing of the closure. Alternatively, the retaining element is a component separate from the inner sleeve and is located, i.e., positioned, within the inner sleeve. This allows the structurally identical closure to be individually adapted to the container system by means of specifically designed retaining elements.

[0017] It has proven advantageous for the retaining element to be an annular extension that is at least partially continuous. This ensures that the spring plate is held evenly around its entire circumference within the inner mantle. The annular extension can be understood as a circular appendage projecting from the inner mantle. The annular extension is at least partially continuous, meaning it is a ring arranged within the inner mantle that is at least partially continuous, i.e., it has at least a segment of a ring. Such interruptions in the annular extension allow for a particularly material-efficient function. Alternatively, the annular extension can be completely continuous to support the spring plate around its entire circumference.The height, radial section extent, surface finish and / or inner diameter of the annular extension is dimensioned such that the spring plate can be clipped or clicked into the inner mantle via the annular extension and cannot be pushed out of the inner mantle via the annular extension.

[0018] In a further particularly preferred embodiment of the invention, a sealing element is arranged in the inner sleeve between the spring plate and the retaining element, which is pressed against the neck edge by the spring plate in the closed position. This allows a reliable seal of the opening to be achieved even though pressure on the neck edge is not exerted by a threaded closure.

[0019] The sealing element is preferably a sealing disc. It is essential that the sealing element is pressed against the entire circumference of the annular neck edge in the closed position to achieve a complete seal of the opening.

[0020] It proves advantageous if the sealing disc is made of a foamed plastic, in particular a foamed polyolefin. The foamed plastic can be compressed when pressed by the spring plate onto the neck edge. This improves the seal, even if there are any irregularities on the neck edge. Other sealing materials, such as rubber compounds or fibrous materials (paper), are also conceivable for the sealing element.

[0021] In a further preferred embodiment, the opening is closed by a sealing film which is sealed to the neck edge to provide a tamper-evident seal in conjunction with the sealing element. A tamper-evident seal is understood to mean proof that the container system has not been opened before its initial intended use. Furthermore, the sealing film and sealing element also extend the shelf life of goods stored in the container. The invention has the additional advantage that the spring plate presses the sealing element against the neck edge even when the sealing film is removed. The spring action of the spring plate compensates for any missing height of the sealing film, and the opening remains reliably sealed after initial opening.

[0022] Advantageously, in the closed position, the neck edge penetrates so deeply into the inner mantle that it protrudes beyond the retaining element. This means that the retaining element does not obstruct the sealing element and the spring plate in the closed position, and the sealing element can be pressed onto the neck edge without hindrance.

[0023] In a further preferred embodiment of the invention, a plurality of circumferentially arranged spring leaves are formed on a top side of the spring plate, and the spring leaves are positioned parallel, perpendicular or inclined to the circumferential direction.

[0024] It is preferred if the spring leaves are inclined or tilted relative to the top of the spring plate or protrude orthogonally from the spring plate.

[0025] The spring leaves are an integral part of the spring plate and are preferably manufactured in one piece with the plate. Alternatively, the spring leaves can be subsequently attached to the spring plate. The spring leaves generate a uniform spring force distributed around the circumference of the spring plate when they are supported by the top section. Alternatively, the spring leaves can also be inclined towards the spring plate to generate the spring force by means of a cone or truncated cone located in the top section. The slope of an inner surface of the cone or cone determines the degree of displacement of the spring leaves when the perpendicular distance between the spring plate and the cone decreases. The top section itself can be designed as a cone, or the cone can be arranged on it. Such elastic bending of the spring leaves towards the plate by means of the top section achieves the 1040-26687 5 06.08.2025

[0026] A spring force, or restoring force, is generated. For example, the degree of inclination of the spring leaves relative to their initial position, i.e., the open position of the closure, can determine the magnitude of the spring force. It is conceivable that each spring leaf and / or the spring element could be a bending spring, such as a single coil spring or multiple coil springs, a torsion spring, or a disc spring. Alternatively, the spring leaves could be arranged on the lid, with the cone forming part of the spring plate. This allows for a particularly flexible design of the closure's outer casing. Alternatively, instead of spring leaves, an elastic material, such as foamed polyolefin or foamed polyurethane, could be positioned between the spring plate and the lid to generate the restoring force.

[0027] It has proven advantageous to form a truncated cone in the ceiling area, oriented towards the spring plate, with a lateral surface that interacts with the spring leaves to generate the spring force. In this embodiment, the sealing element is realized by the truncated cone. The truncated cone, or a sealing cone, can be manufactured as part of the spring plate. A circular seal of the neck edge can also be achieved by means of the sealing cone.

[0028] Ideally, the edge of the outer casing and the contour of the shoulder are aligned in the closed position. This visually indicates that the closure is in the closed position. Such alignment can be detected, for example, using a sensor such as a camera. Furthermore, the alignment of the closure with the shoulder results in a pleasing appearance for the container system.

[0029] The invention is also preferably characterized in that each locking element has a step which is bounded by a first and second side flange. The step thus has the two side flanges on both sides of the step, which bound the step on both sides. The two side flanges of each locking element guide each projection to the respective step when the closure is engaged. In the closed position, the side flanges prevent the closure from twisting on the neck. Both side flanges thus each serve to guide and subsequently fix the corresponding projection.

[0030] It is advantageous if the step is chamfered towards the neck edge. This means that a step surface is inclined towards the neck edge. In particular, the angle between the step surface and the neck can be between 20° and 70°, preferably between 30° and 60°. The chamfer allows the respective projection to slide non-destructively over the corresponding step when the closure is pressed onto the neck. In particular, the chamfering of the step can reduce stress on the closure in the area of ​​the locking elements during pressing. It is also conceivable that the closure is not pressed onto the neck but rather screwed on during initial placement. In this case, the step can interact with a thread required for screwing.

[0031] The side cheeks are advantageously angled so that their horizontal distance decreases towards the shoulder. This means that the perpendicular distance between the side cheeks and the central axis of the step decreases with increasing distance from the neck. The side cheeks therefore act as a kind of "guiding aid," directing the respective projection directly onto the steps of each locking element when the fastener snaps into place. If the fastener is not precisely aligned with the neck when snapped into place, this inaccuracy can be compensated for by the angled side cheeks.

[0032] In a further embodiment of the invention, the side flanges project beyond the step towards the shoulder with their lower ends and thus, in the closed position, serve as a stop for the respective projection in the circumferential direction. Here, a stop is understood as a boundary that prevents movement of the respective projection. The height of these projections is dimensioned such that the projections are positioned lower than the side flanges when the closure is pressed completely downwards in the axial direction, i.e., towards the container. Only then can the closure be turned to the left or right, thereby overcoming the child safety lock. Alternatively, the closure can be designed to rotate only to the left or right.

[0033] Each projection is preferably chamfered towards the lower edge of the inner sleeve. This means that a projection surface is inclined towards the lower edge of the inner sleeve. In particular, the projection surface and the lower edge can form an angle between 20° and 70°, preferably between 30° and 60°. This allows the closure to engage gently. The engagement is particularly gentle on the material if, in addition to each projection, each step is also chamfered. Alternatively or additionally, the projections are formed at the lower edge of the inner sleeve. This means that the normal distance between the ceiling area and the projections is maximized. As a result, the height of the inner sleeve above the projections, i.e., towards the ceiling area, is sufficient to accommodate other components of the closure, such as the retaining element, the spring plate, and / or the sealing element.

[0034] In a further preferred embodiment, the inner shell comprises at least two cylindrical shell sections. The inner shell thus has several cylindrical shell sections that deviate from a continuous, and in particular, a one-piece cylinder. The shell sections can be designed, for example, as half-shells, third-shells, and / or quarter-shells. In particular, the inner shell can initially be designed as a cylindrical section in the top region, with the at least two shell sections adjoining the cylindrical section on a side opposite the top region, i.e., projecting or cantilevering from it. The shell sections can be spaced apart from each other parallel to a cylindrical axis of the inner shell, so that an air gap is formed between two shell segments. Advantageously, shell sections designed in this way facilitate alignment of the closure and the container with each other when the container is closed.Furthermore, such a closure with shell sections is particularly easy to demold, and forced demolding reduces deformation of the closure during manufacturing. Additionally, the increased flexibility of the inner shell provided by the shell sections facilitates the snap-fit ​​connection of the closure and container.

[0035] In another preferred embodiment, the shoulder cross-section of the container and the edge of the outer shell each have an oval shape and are symmetrical with respect to a respective major and minor axis. This elliptical shape is widely used in the packaging industry because it makes the closure and the container easy to grip. This facilitates, for example, semi- or fully automated filling and closing processes. The symmetrical, oval shape also acts as an alignment aid, allowing immediate recognition that the closure is in the closed position, as the outer contours of the container and the closure coincide.

[0036] It is advantageous if the protrusions are arranged symmetrically on the inside of the inner mantle and the locking elements are arranged correspondingly on the outside of the neck. In particular, the protrusions and the locking elements can be arranged opposite each other. The at least symmetrical arrangement results in a uniform holding force, which leads to a further optimized seal of the opening. An arrangement of protrusions and corresponding locking elements determines the locking position. If, for example, the closure comprises several protrusions with differing geometric shapes, these are arranged on the corresponding locking elements in the predetermined locking position.For example, the fastener can comprise two projections, with the first projection having a smaller radial extent compared to the second projection and / or being arranged asymmetrically to them, resulting in only one locking position. Alternatively, the fastener can have multiple locking positions if the projections or locking elements are arranged symmetrically and are geometrically identical in shape, i.e., interchangeable.

[0037] Further advantages and features will become apparent from the following description of an exemplary embodiment of the invention with reference to the schematic diagrams. These are shown in a representation not to scale:

[0038] Figure 1: an exploded view of a first embodiment of a container system in an axonometric view;

[0039] Figure 2: the closure from Figure 1 in a view from a slightly oblique top view;

[0040] Figure 3: a side view of the closure and

[0041] Figure 4: a sectional view of the closure along line IV-IV.

[0042] Figure 5: an exploded view of a second embodiment of the container system in an axonometric view;

[0043] Figure 6: a side view of the clasp

[0044] Figure 7: a sectional view of the closure along line VII-VII and

[0045] Figure 8: the closure from Figure 5 in a view from a slightly oblique angle above.

[0046] Figures 1 and 4 show a first embodiment of the container system, and Figures 5 and 7 show a second embodiment of the container system, which together are designated by reference numeral 11. The container system 11 comprises a container 13 and a closure 15. 1040-26687 9 06.08.2025

[0047] The container 13 has a container body 17, which defines an interior space 19. The interior space 19 serves to hold a contents. A shoulder 21 adjoins the upper surface of the container body 17 and has a non-rotationally symmetrical cross-section. The shoulder cross-section can be, for example, oval or elliptical. A circular cylindrical neck 23 is formed on the shoulder 21. The neck 23 has a rim 25 and defines or encloses an opening 27.

[0048] The fastener 15 has an outer shell 29, which is open on its underside and has a non-rotationally symmetrical rim 31 corresponding to the shoulder cross-section on its underside. Furthermore, the fastener 15 has a cover section 33 adjoining the upper side of the outer shell 29 and a circular cylindrical inner shell 35. The inner shell 35 is formed on the inside of the cover section 33 (Figure 2). The oval fastener 15 and the oval shoulder 21 can have a major axis 34 and a minor axis 36 and be symmetrical with respect to these axes.

[0049] On the inner surface 37 of the inner sleeve 35, two radially extending projections 39 are formed, which, in a closed position, engage with two detent elements 41 formed on the outer surface of the neck 23. The projections 39 are formed at the lower edge 53 of the inner sleeve 35.

[0050] A spring plate 43 is arranged in the inner sleeve 35, which generates an axial force. In a closed position, the axial spring force causes the projections 39 to be pulled upwards towards the detent elements 41 and the spring plate 43 to be pressed against the neck edge 25.

[0051] The features described in the last paragraph provide child safety protection for the lock 15. The lock 15 can only be rotated from the closed position, in which the projections 39 engage with the locking elements 41, to an open position on the neck 23 when, in addition to torsion, an axial downward force is applied to the lock 15 against the spring force. To rotate the lock 15 from the closed position to the open position, it must first be pressed downwards. This releases the locking mechanism between the projections 39 and the locking elements 41, allowing the lock 15, along with the projections 39, to be rotated circumferentially. Since there is no thread, the lock 15 can be rotated into the open position either clockwise or counterclockwise. 1040-26687 10 06.08.2025

[0052] On the inner side 37, an annular extension 45 is formed between the ceiling area 33 and the projections 39. The spring plate 43 can be clipped into the inner sleeve 35 by pressing it over the annular extension 45 towards the ceiling area 33. A sealing washer 47 is additionally clipped into the inner sleeve 35 below the spring plate 43.

[0053] The locking element 41 has a step 49. The step 49 is bounded at its left and right ends by a first and second side flange 51a, 51b. The step 49 is beveled towards the neck edge 25 so that the fastener 15 with its projections 39 can be pressed onto the locking elements 41. Accordingly, it is also advantageous if the projection 39 is beveled towards the lower edge 53 of the inner sleeve 35. The side flanges 51a, 51b are oriented obliquely downwards, thus providing an insertion aid for the projections 39 when the fastener 15 is pressed onto the neck 23. The side cheeks 51a, 51b extend beyond the step 49 towards the shoulder 21 with their lower end 52. Thus, in the closed position, the side cheeks 51a, 51b serve as a stop for the projection 39 in the circumferential direction.The locking mechanism 15 can therefore only be rotated when it is pressed downwards to such an extent that the projections 39 are positioned lower than the side plates 51a, 51b. The projections 39 interact with the detent elements 41 and the spring plate 43 in the manner of a bayonet lock.

[0054] To provide a first-opening guarantee, the opening 27 is sealed by a sealing foil 55, which is sealed onto the neck edge 25.

[0055] To generate the spring force, a plurality of circumferentially arranged and inclined spring leaves 57 are formed on the upper side of the spring plate 43.

[0056] The child-resistant container system 11 works as follows: After the container 13 has been filled with contents via the opening 27, the opening 27 is closed with the sealing film 55 by sealing the sealing film 55 onto the neck edge 25.

[0057] To ensure that the edge 31 of the outer casing 29 and the shoulder 21 are aligned in the closed position, it is preferred that the locking elements 41 and the projections 39 are arranged opposite each other on the main axis 34 or on the secondary axis 36. This ensures automatic alignment of the closure 15 and the shoulder 21. The closure 15 is pressed onto the neck 23. The projections 39 are thereby aligned with the steps 49 by the inclined side flanges 51a, 51b. The opposing angles of the projections 39 and steps 49 enable this pressed-on action without damaging any elements. 1040-26687 11 06.08.2025

[0058] The projections 39 are positively locked to the locking elements 41 or the steps 49 in the closed position. It would also be conceivable to screw the closure 15 onto the neck 23 for the initial closure; however, automated screwing is usually more complex to implement than automated snapping.

[0059] During the impact phase, the neck 23 penetrates the inner sleeve 35 and pushes the sealing disc 47 and the spring plate 43 upwards, starting from the annular extension 45, against which the spring leaves 57 press the sealing disc 47 and the spring plate 43. In the closed position, the spring plate 43 performs two functions: Firstly, the projections 39 are pulled upwards against the detent elements 41 and the steps 49, respectively. This prevents the closure 15 from being rotated to the left or right, because the steps 49 abut the side walls 51a and 51b. Secondly, the sealing element 47 is pressed against the neck edge 25 and seals the opening 27. Therefore, it is preferable for the sealing element 47 to be made of a foamed polyolefin. The choice of plastic for the sealing element 47 ensures a reliable seal.For a reliable seal, it is also essential that, in the closed position, the neck edge 25 penetrates so deeply into the inner mantle 35 that it protrudes beyond the annular projection 45. This is because, in the closed position, the sealing washer 47 must be able to be pressed by the spring plate 43 onto the neck edge 25 and must not abut the annular projection 45.

[0060] After the removal of the sealing film 55, the spring plate 43 continues to press the sealing element 47 against the neck edge 25 in the closed position. A further advantage of the invention is therefore the reliable sealing of the opening 27, even when the sealing film 55 has been removed and the sealing element 47 can accordingly be pressed further downwards against the neck edge 25.

[0061] If the opening 27 is to be closed again by the closure 15 after use of the container 13, the closure 15 must be pressed downwards onto the neck 23 against the pressure of the spring plate 43. Only then can the projections 39 be rotated past the lower ends 52 of the side walls 51a, 51b and engage with the locking elements 41. It is also conceivable that the lower ends 52 are chamfered on their outer sides. This would automatically guide the projections 39 downwards through the side walls 51a, 51b and over the lower ends 52 when the closure 15 is turned. Due to the preload, the projections 39 automatically engage between the side walls 51a, 51b with the locking elements 41. 1040-26687 12 06.08.2025

[0062] The closure 15 is preferably injection-molded, and the container 13 can be extrusion bias-molded, injection bias-molded, or injection stretch bias-molded. The closure 15 can be made of a polyolefin, and the container 13 can be made of a polyolefin or a polyester, in particular PET. A polyolefin is the most suitable plastic for the spring plate 43. The sealing film 55 is made of aluminum suitable for induction sealing so that it can be sealed onto the neck edge 25.

[0063] Figures 5 and 7 describe a second embodiment of the container system 11, in which the spring force is generated by the interaction of the spring leaves 57 with a truncated cone 59. The truncated cone 59 is formed on the inside of the lid area 33, has a lateral surface 60, and faces the spring leaves 57. In this second embodiment, the spring leaves 57 are oriented parallel to the circumferential direction of the spring plate 43 and their open ends are angled outwards. This allows the truncated cone 59 to interact effectively with the spring leaves 57 via its lateral surface 60 without undesirably bending the spring leaves 57 inwards. The spring leaves 57 can also project orthogonally from the spring plate 43. Figures 5 and 7 show that the truncated cone 59 is deep-drawn downwards, and the lid area 33 accordingly has a recess 61 on its upper surface.Accordingly, the truncated cone 59 is an integral part of the closure 15. It is also conceivable that the outer surface of the cover area 33 is flat. In this case, the truncated cone 59 could be connected to the inner surface of the cover area 33 as a separate part. When the closure 15 is placed on the neck 23, the axial movement of the truncated cone 59 pushes the elastic spring leaves 57 outwards. The restoring force of the spring leaves 57 forces the closure 15 and the spring plate 43 apart.

[0064] In Figure 8, the inner shell 35 is realized as a first and second half-shell 35a, 35b. Gaps 63 are provided between the half-shells 35a, 35b. The half-shells 35a, 35b facilitate the snapping of the closure 15 onto the neck 23. Furthermore, such a closure 15 with shell sections 35a, 35b is particularly easy to demold, and forced demolding reduces deformation of the closure 15 during manufacturing. 1040-26687 13 06.08.2025

[0065] Legend:

[0066] 11 Container system

[0067] 13 containers

[0068] 15 Closure

[0069] 17 Container bodies

[0070] 19 Interior

[0071] 21 Shoulder

[0072] 23 Neck

[0073] 25 neck edge

[0074] 27 Opening

[0075] 29 Outer coat

[0076] 31 Open edge of the outer mantle

[0077] 33 Ceiling area

[0078] 34 Main axis

[0079] 35 Inner jacket

[0080] 35a, 35b Inner shell as first and second hemisphere

[0081] 36 Secondary axle

[0082] 37 Inside of the inner mantle

[0083] 39 lead

[0084] 41 Latching element

[0085] 43 Spring plate

[0086] 45 Ring process, retaining element

[0087] 47 Sealing element, sealing disc

[0088] 49th level

[0089] 51a, 51b First and second lateral cheek

[0090] 52 Lower end of the side cheek

[0091] 53 Lower edge of the inner mantle

[0092] 55 sealing foil 1040-26687 14 06.08.2025

[0093] 57 Leaf spring

[0094] 59 frustum

[0095] 60 Surface area of ​​the truncated cone

[0096] 61 In-depth study

[0097] 63 gap

Claims

1040-26687 15 06.08.2025 1. Container system (11) comprising - a container (13) with a container body (17) of a shoulder (21) which connects to an upper surface of the container body (17) and has a non-rotationally symmetric shoulder cross-section and a circular cylindrical neck (23) which is formed on the shoulder (21) and has a neck edge (25), - a closure (15) with an outer shell (29) which is open at its underside and has on its underside a non-rotationally symmetrical rim (31) corresponding to the shoulder cross-section, a cover area (33) adjoining an upper side of the outer shell (29) and a circular cylindrical inner shell (35) which is formed on an inner side of the cover area (33), and - a child safety device which is realized by an interaction of the container (13) and the closure (15) in that the closure (15) can only be rotated from a closed position to an open position on the neck (23) when an additional force acts on the closure (15) in addition to the torsion, characterized in that at least two radially extending projections (39) are formed on an inner side (37) of the inner shell (35), which in the closed position engage with at least two detent elements (41) formed on an outer side of the neck (23), and that a spring plate (43) generating an axial force is arranged in the inner shell (35), which force in the closed position pulls the projections (39) upwards towards the detent elements (41) and presses the spring plate (43) against the neck edge (25). 1040-26687 16 06.08.2025 2. Container system according to claim 1, characterized in that a retaining element (45) is arranged on the inside (37) of the inner shell (35) between the ceiling area (33) and the projections (39), which holds the spring plate (43) in the inner shell (35).

3. Container system according to claim 2, characterized in that the retaining element is an at least partially continuous ring extension (45).

4. Container system according to one of claims 2 to 3, characterized in that a sealing element (47) is arranged in the inner jacket (35) between the spring plate (43) and the retaining element (45), which is pressed against the neck edge by the spring plate (43) in the closed position.

5. Container system according to claim 4, characterized in that the sealing element is a sealing disc (47).

6. Container system according to one of claims 4 or 5, characterized in that the sealing element (47) is made of a foamed plastic, in particular of a foamed polyolefin.

7. Container system according to one of the preceding claims 4 to 6, characterized in that the neck (23) defines an opening (27) which is closed by a sealing film (55) which is sealed onto the neck edge (25) in order to provide a first opening guarantee by interaction with the sealing element (47).

8. Container system according to one of the preceding claims 2 to 7, characterized in that in the closed position the neck edge (25) penetrates so deeply into the inner shell (35) that it protrudes beyond the retaining element (45).

9. Container system according to one of the preceding claims, characterized in that a plurality of circumferentially arranged spring leaves (57) are formed on a top side of the spring plate (43) and the spring leaves (57) are positioned parallel, perpendicular or inclined to the circumferential direction.

10. Container system according to claim 9, characterized in that the spring leaves (57) are inclined or tilted relative to the top of the spring plate (43) or project orthogonally from the spring plate (43). 1040-26687 17 06.08.2025 11. Container system according to claim 9 or 10, characterized in that in the ceiling area (33) a truncated cone (59) oriented in the direction of the spring plate (43) is formed with a lateral surface (60) which lateral surface (60) cooperates with the spring leaves (57) to generate the spring force.

12. Container system according to one of the preceding claims, characterized in that the edge (31) of the outer shell (29) and a contour of the shoulder (21) are brought into alignment in the closed position.

13. Container system according to one of the preceding claims, characterized in that each locking element (41) has a step (49) which is bounded by a first and second side wall (51a, 51b).

14. Container system according to claim 13, characterized in that the step (49) is chamfered in the direction of the neck edge (25).

15. Container system according to one of claims 13 or 14, characterized in that the side walls (51a, 51b) are oriented at an angle such that their horizontal distance decreases in the direction of the shoulder (21).

16. Container system according to one of claims 13 to 14, characterized in that the side walls (51a, 51b) extend beyond the step (49) in the direction of the shoulder (21) with their lower ends (52) and thereby serve as a stop for each projection (39) in the circumferential direction in the closed position.

17. Container system according to one of the preceding claims, characterized in that each projection (39) is chamfered in the direction of a lower edge (53) of the inner shell (35) and / or each projection (39) is formed on the lower edge (53) of the inner shell (35).

18. Container system according to one of the preceding claims, characterized in that the inner shell (35) comprises at least two cylindrical shell sections (35a, 35b).

19. Container system according to one of the preceding claims, characterized in that the shoulder cross-section of the container (13) and the rim (31) of the 1040-26687 18 06.08.2025 outer shell (29) have an oval shape and are preferably symmetrical with respect to a respective principal axis (34) and a respective minor axis (36).

20. Container system according to one of the preceding claims, characterized in that the projections (39) are arranged symmetrically, in particular opposite each other, on the inside (37) of the inner shell (35) and the locking elements (41) are arranged correspondingly on the outside of the neck (23).

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