DE102013018095A1 - Cover assembly for a packaging container, packaging container with such a lid assembly and method for their preparation - Google Patents

Abstract

It is proposed a lid assembly for a packaging container, which comprises a lid ring made of a plasticizable, thermoplastic polymer material and an attachable to the lid ring, shape-containing cover part. The invention provides that the cover part on its side facing the cover ring has a layer of a peelable plastic material, wherein the peelable layer contains a sealable, thermoplastic polymer or coated with a cover layer of such a polymer, and that the cover ring at its the Cover part facing end has at least one circumferential projection which is sealed with the peelable layer or the cover layer of the lid part. Alternatively it can be provided that the cover ring on its side facing the cover part has a layer of a peelable plastic material of the aforementioned type, and that the cover part has on its the cover ring facing end face at least one circumferential projection which is sealed with the peelable layer of the cover part. The invention further relates to a packaging container with such a lid assembly and a method for their preparation.

Description

The invention relates to a lid assembly for a packaging container, comprising a lid ring made of a plasticizable, thermoplastic polymer material and a cover part which can be placed on the lid ring and has a shape. The invention further relates to a packaging container with a sleeve, which is provided with such a lid assembly, and to a method for producing such a lid assembly.

Packaging containers provided with such lid parts find widespread use, in particular in the form of so-called composite cans. In this case, the lid part closes the one end of the sleeve usually made of paper or cardboard composite materials, while the other end of the sleeve is closed by a bottom part. Such packaging containers or cans are used in particular for receiving free-flowing or fluid substances, for example food and beverages. To the contents of the packaging container from external influences, eg. As moisture, or to prevent loss of substance, for example by drying, to protect the material of the sleeve usually an inner lining of a substantially gas- and liquid-impermeable material, such as aluminum, plastic or the like.

In addition to such protection of the packaging good generic packaging container can be sealed by a membrane of gas-impermeable material, such as metal, plastic or the like usually in order to provide further protection and a longer shelf life of the packaged goods and protection of the consumer from unwanted or intended damage or contamination of the packaged goods. If the packaging container is equipped with a cover arrangement of the type mentioned, the membrane is sealed inside the sleeve along a cylindrical sealing surface on the sealable inner lining, or is sealed to the front side of the sleeve, provided that an opening edge, such as in the form of a Bördels, which is closable with a simple slip lid. Such a membrane seal is durably more or less completely removed during the first opening of the cardboard composite can, whereby a successful opening of the cardboard composite can be clearly seen. In order to ensure a simple rupture of such a membrane, without leaving sharp edges and thus a risk of injury representing remnants of the membrane on the inner circumference of the sleeve and protrude into the interior of the sleeve, often find so-called peelable membranes use, which consist of several laminates constructed layers, of which at least one layer is made of a peelable, delaminating material. Such membranes are for example from the EP 2 386 410 A1 known.

The lid assembly is used in known packaging containers primarily for reclosing the packaging container after the sealing membrane has been removed, the lid part should suitably fit as tight as possible to the specified at the top of the sleeve cover ring to protect the packaged - so far as possible - from external influences. In addition, it is known to aufzusiegeln the lid part in turn on the cover ring or on, so that on the one hand a tamper-evident closure is formed, which is able to display the first-time opening of the packaging container and which on the other hand serve to the membrane additional or alternative protection of the packaging material from external influences can, if the cover ring is gas- and liquid-tightly connected to the sleeve, for example, by being sealed or welded to the inner lining of the sleeve.

However, the latter is problematic in the case of a more or less form-containing cover part, as it is necessary to after the first opening on the cover ring, z. B. non-positive or positive, such as clamping, latching or the like to be able to determine. Here, there is a problem that when sealing or welding of the cover part on the cover ring, a more or less flat fusion connection is generated, which makes a simple Abrennen the lid part of the lid ring when first opened very difficult, and it also causes damage to both the lid part as well as the cover ring can come. In addition, the Applicant has found that a sealing or welding of the cover part on the cover ring also causes problems when the cover ring is provided with a layer of peelable plastic material, which should ensure a clean separation of the cover ring. The reason for this consists primarily in the fact that for sealing or welding of the form-containing cover part on the cover ring due to its compared with conventional membrane films of higher material thickness requires such a high melting energy that the peelable layer is destroyed and its intended function no longer meet can. This is especially true in the case of ultrasonic sealing or welding, in which the cover part is vibrated by means of ultrasound to heat its contact surface with the lid ring due to friction and to seal or fuse together. It has been shown that to produce a flawless, liquid and gas-tight melt connection so high ultrasonic energy is required that peelable layers of the cover part are destroyed.

The invention is therefore the object of a lid assembly of the type mentioned above and a container provided with such a lid assembly packaging container in a simple and cost-effective manner to the effect that the cover part is substantially gas- and liquid-tight aufweiss on the cover ring or welded, but however, a simple first-time separation of the lid part from the lid ring is ensured. It is further directed to a method of making such a lid assembly.

• – das Deckelteil an seiner dem Deckelring zugewandten Seite wenigstens eine Lage aus einem peelfähigen Kunststoffmaterial aufweist, wobei die peelfähige Lage wenigstens ein siegelbares, thermoplastisches Polymer enthält und/oder mit einer Decklage aus einem solchen Polymer beschichtet ist, und dass der Deckelring an seiner dem Deckelteil zugewandten Stirnseite wenigstens einen Umfangsvorsprung aufweist, welcher mit der peelfähigen Lage und/oder der Decklage des Deckelteils versiegelt ist; oder
• – der Deckelring an seiner dem Deckelteil zugewandten Seite wenigstens eine Lage aus einem peelfähigen Kunststoffmaterial aufweist, wobei die peelfähige Lage wenigstens ein siegelbares, thermoplastisches Polymer enthält und/oder mit einer Decklage aus einem solchen Polymer beschichtet ist, und dass das Deckelteil an seiner dem Deckelring zugewandten Stirnseite wenigstens einen Umfangsvorsprung aufweist, welcher mit der peelfähigen Lage und/oder der Decklage des Deckelteils versiegelt ist.

This object is achieved in a lid assembly of the type mentioned above in that

• - The cover part on its side facing the cover ring at least one layer of a peelable plastic material, wherein the peelable layer contains at least one sealable thermoplastic polymer and / or coated with a cover layer of such a polymer, and that the cover ring on its the cover part facing end side has at least one circumferential projection which is sealed with the peelable layer and / or the cover layer of the lid part; or
• - The cover ring on its side facing the cover part at least one layer of a peelable plastic material, wherein the peelable layer contains at least one sealable thermoplastic polymer and / or coated with a cover layer of such a polymer, and that the cover part at its the lid ring facing end side has at least one circumferential projection which is sealed with the peelable layer and / or the cover layer of the lid part.

A suitable for solving this task packaging container is characterized in that it comprises such a lid assembly, the cover ring at one end of the sleeve, in particular substantially gas and liquid tight, is fixed.

Finally, the invention provides in procedural terms to solve this problem before in a method for producing such a lid assembly that the lid part is placed on the lid ring and the lid part is excited with ultrasound, wherein the peelable layer and / or the cover layer of the lid part or the Cover ring with the at least one circumferential projection of the cover ring or the cover part is ultrasonically sealed.

The invention makes it possible in a surprisingly simple manner, aufzusiegeln the provided with at least one peelable layer, shape-containing cover part (or provided with the at least one peelable layer cover ring) of the cover assembly by means of ultrasound on the cover ring (or on the cover part) or aufzuschweißen and thereby both to form a very easy and convenient to open tamper evident as well as to ensure the greatest possible gas and liquid tightness of the lid assembly by the at the with the cover part (or with the cover ring) in contact peripheral projection of the cover ring (or of the lid part) as a local energy director during ultrasonic sealing of the lid part with the lid ring. When the cover part is ultrasonically vibrated by means of a sonotrode during the ultrasonic welding process, the peripheral projection is locally plastified and melted due to friction with the cover part, which is preloaded in particular mechanically in the direction of the cover ring, whereby the sealed seal or welded connection is produced. The ultrasound energy required for this purpose (or the amplitude of the ultrasound) can be chosen to be sufficiently low despite the relatively large thickness of the form-containing cover part, in order to prevent thermal and / or mechanical destruction of the peelable layer of the cover part, so that these to fulfill their intended function. In this case, the inventive method is in particular practically self-regulating, because even if it comes in the immediate contact region of the peripheral projection of the cover ring (or the cover part) with the cover ring (or with the cover part) to a thermo-mechanical impairment of the peelable layer - which respect high and reliable gas-tightness may even be desirable - in the radially adjacent to the circumferential projection edge areas to a fusion compound only substantially due to heat conduction, so that in any case there destruction of the peelable layer is excluded. If desired, the cover arrangement according to the invention can consequently render unnecessary an (additional) sealing membrane in the interior of the sleeve of the packaging container.

The material of the peelable layer can be of any known construction, its delamination capacity usually being achieved by being formed from at least two polymers which are incompatible with one another and / or have a different melting point, and whose boundary surfaces consequently have only relatively low binding forces. so that it can be separated cleanly. For example only in this context peelable layers of one hand polyolefins, such as polyethylene, z. Eg LDPE (Low Polyethylene), polypropylene or their copolymers and polymer blends and on the other hand polyolefins such as polypropylene, polyethylene, polybutene, z. B. isotactic polybutylene-1 (iPB-1), or their copolymers and polymer blends mentioned. The cover part provided with such a peelable layer (or the cover ring provided with such a peelable layer) can in particular be laminate-shaped and, in addition to the peelable layer, further layers, such as form-retaining support layers, e.g. B. also from polyolefins, terephthalates, z. As polyethylene terephthalate, polyamides and the like, adhesion promoting layers, barrier layers (see below), etc. include. Furthermore, the peelable form the immediate cover layer on the side facing the cover ring side of the cover part (or on the cover part facing side of the cover ring), wherein at least one of the polymers of the peelable layer with the cover ring (or with the cover part) ultrasonically sealed or is welded (ie the peelable layer itself serves to form the fusion bond), or the peelable layer may be coated on the outside with a sealable or weldable thermoplastic cover layer, which provides at least primarily for the formation of the seal or welded joint and the first time Separation of the lid part of the lid ring on the lid ring (or on the lid part) remains, while the underlying peelable layer breaks.

It should be noted at this point that the term "sealing" in the context of the present disclosure, the creation of a fused connection is addressed, the term "welding" is used synonymously.

As already indicated, it is provided in an advantageous embodiment of the method according to the invention that the cover part is placed on the cover ring and the cover part is excited with ultrasound, the peelable layer and / or the cover layer of the cover part or the cover ring with the at least one circumferential projection of the cover ring or the lid part is ultrasonically sealed. This allows a prior application of the cover ring on the sleeve of a packaging container, wherein the cover part remains freely accessible to put it in ultrasonic vibration.

In this case, it may also be advantageous if the cover part is excited by means of at least one sonotrode with ultrasound, which extends at least substantially around the entire circumference of the at least one circumferential projection of the cover ring, so that a complete fusion of the cover ring with the cover part in the region Circumferential projection is ensured. The sonotrode can be plate-shaped or ring-shaped, for example.

• – der Deckelring an seiner dem Deckelteil zugewandten Stirnseite wenigstens zwei, insbesondere genau zwei, im Wesentlichen konzentrisch angeordnete Umfangsvorsprünge aufweist, welche mit der peelfähigen Lage und/oder der Decklage des Deckelteils versiegelt sind; oder
• – das Deckelteil an seiner dem Deckelring zugewandten Stirnseite wenigstens zwei, insbesondere genau zwei, im Wesentlichen konzentrisch angeordnete Umfangsvorsprünge aufweist, welche mit der peelfähigen Lage und/oder der Decklage des Deckelrings versiegelt sind.

As regards the lid assembly according to the invention, a particularly advantageous embodiment provides that

• - The cover ring at its end facing the cover part has at least two, in particular exactly two, substantially concentrically arranged peripheral projections, which are sealed with the peelable layer and / or the cover layer of the cover part; or
• - The cover part on its side facing the cover ring end face at least two, in particular exactly two, substantially concentrically arranged peripheral projections which are sealed with the peelable layer and / or the cover layer of the cover ring.

In this way, not only a particularly secure and reliable melt connection of the greatest possible tightness between the cover ring and the cover part is formed, but results in particular in the annular region between the peripheral projections, in which it also preferably due to heat conduction to a fusion bond during the ultrasonic sealing or Welding comes, a defined area within which the peelable layer of the cover part (or the cover ring) is capable of tearing apart when first disconnected.

The radial distance of the circumferential projections for this purpose is preferably between about 0.3 mm and about 3 mm, in particular between about 0.5 mm and about 2 mm, preferably between about 0.7 mm and about 1 mm.

Moreover, it has proven to be advantageous if the circumferential projection has a height between about 0.05 mm and about 0.4 mm, in particular between about 0.1 mm and about 0.35 mm, preferably between about 0.15 mm and about 0.3 mm, wherein it should expediently have at least a height of about 0.05 mm in order to prevent it being more or less completely melted off during the ultrasonic welding process, which leads to a planar transmission of the ultrasound energy and to one conditional, areal thermo-mechanical stress on the entire face of the cover ring and the hereby coming in contact cover part would come, which in turn would bring the risk of destruction of the peelable layer at least after a certain period of use with it.

Furthermore, it may be advantageous if the cross section of the circumferential projection tapers towards its free end, wherein the circumferential projection may in particular have a substantially triangular cross section, which of course is not necessarily pointed must, but can also have a frontal rounding.

In any case, as already mentioned, the cover part has a sufficient thickness to provide the desired dimensional stability, which makes it possible after the first separation from the cover ring again - be it clamping, latching or otherwise - placed on the cover ring and attached to it become. In this case, in an advantageous embodiment, the cover part has a total thickness of at least approximately 0.2 mm, in particular of at least approximately 0.3 mm, preferably of at least approximately 0.4 mm, with a thickness of up to approximately 10, for example mm, preferably up to about 8 mm.

As already indicated, can also be provided in a further advantageous embodiment that at least the cover part has at least one further layer in the form of a substantially gas and liquid-tight barrier layer to provide a hermetic inclusion of the packaged goods, while a sealing membrane inside of the packaging container dispensable. Such barrier layers are known as such and may for example be made of metal or metal oxides, for. Example of silicon (di) oxide, aluminum, alumina, etc., from polymers, eg. B. from ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVOH), polyvinylidene chloride (PVDC), polyamide (PA) including their copolymers and polymer blend, etc. may be formed. Such barrier layers can be laminated, for example, as an outer cover layer or, optionally with interposition of suitable adhesion promoter layers, as an inner layer during the production process of a suitable laminate used for the cover part or in the form of a lacquer.

As also already indicated, an advantageous embodiment of the cover assembly according to the invention provides that the cover part has at least one protruding in the direction of the cover ring peripheral projection whose cross section is adapted to the cross section of a complementary thereto contact surface of the cover ring, that the cover part after first separation from the Cover ring can be fixed to the cover ring, wherein it bears in particular its contact surface substantially sealing. The cover part, which may be formed, for example, as a deep-drawn part, may preferably have a circumferential projection whose outer cross-section substantially corresponds to the inner cross-section of the cover ring, so that the circumferential projection of the cover part rests against the inner cross-section of the cover ring along an annular contact surface when (re) closing. The outer cross section of the circumferential projection of the cover part and / or the inner cross section of the cover part can, if desired, be coated with a suitable sealing material.

The sleeve of a packaging container according to the invention, such as a can, which is equipped with a cover assembly of the type described above, may conveniently comprise a substantially gas and liquid tight inner lining made of known suitable materials, such as metals (e.g. Aluminum) and / or polymers can be made.

In a particularly advantageous embodiment may be provided in this case that the inner lining of the sleeve has at least one layer of a sealable plastic material which is sealed with the cover ring of the lid assembly, so that between the sleeve of the packaging container and the lid ring of the lid assembly according to the invention a permanent , properly gas- and liquid-tight seal or welded connection is ensured. The sealing or welding connection can be created in any known manner, for example also by means of ultrasonic sealing or welding, by means of high-frequency sealing or welding or the like.

The method according to the invention gives, in particular, the possibility that the cover ring is first placed on the sleeve of a packaging container and then the cover part is ultrasonically sealed or welded to the cover ring.

If the sleeve has at least one layer made of a sealable plastic material, the cover ring can in particular be sealed or welded to the inner lining of the sleeve in the manner described above after the sleeve has also been fitted, which in particular along an inner circumferential section of FIG Sleeve can happen, in which engages the cover ring.

Further features and advantages of the invention will become apparent from the following description of an embodiment with reference to the drawings. Showing:

1 a schematic perspective view of a packaging container in the form of a box with an embodiment of a lid assembly according to the invention, the cover ring is fixed to one end of the sleeve, with removed cover part;

2 a schematic sectional view of the lid assembly according to 1 provided packaging container;

3 a schematic detail view of the detail B according to 2 ;

4 a schematic perspective view of the cover ring of the cover assembly according to 1 to 3 in the raw state, ie before sealing or welding to the cover part; and

5 a schematic detail view of the cover ring according to 4 in a cutaway view.

The in the 1 and 2 schematically reproduced and in total by the reference numeral 1 provided packaging container is formed in the present embodiment of a so-called composite can and has a sleeve 2 on, for example, made of a paper or cardboard composite material and with a substantially gas and liquid-tight inner lining with an inside, sealable or weldable cover layer, for. B. of polymer-coated aluminum, may be provided. At its bottom is the sleeve 2 which of course does not necessarily have to have the shown, approximately square cross-section, but also any other cross-sectional shape, for. B. round, oval, polygonal or the like, may have, in a conventional manner by means of a bottom part 3 locked ( 2 ), which in turn from appropriate materials such as the sleeve 2 , but can also be made of metal, plastic or corresponding composite materials with high gas and liquid tightness.

At the in 1 and 2 upper, the bottom part 3 opposite end of the sleeve is a cover ring 4 a total with the reference numeral 5 provided lid assembly which is made of a thermoplastic polymer material, such as such based on polyethylene. As in particular from the 3 can be seen, the cover ring 4 an approximately L-shaped cross section, the first leg 4a sleeve parallel around the upper inner peripheral portion of the sleeve 2 is arranged and the second leg 4b substantially perpendicular thereto about the upper end of the sleeve 2 extends while the upper end of the sleeve 2 overlaps or covers. The outer circumference of the first leg 4a of the cover ring 2 is with the inner lining of the sleeve 2 sealed or welded, for example, ultrasonic or high frequency sealing or welding.

How the turn 1 and 2 can be seen, serves the first leg 4a of the cover ring 4 also for clamping receiving a form-containing, for example in the form of a deep-drawn part formed lid part 6 the lid assembly 5 at its inner circumference, by its inner cross-section approximately the outer cross-section of a in the direction of the cover ring 4 protruding circumferential projection 6a corresponds, so the lid part 6 detachable on the cover ring 4 can be set, wherein the outer cross section of its circumferential projection 6a the inner cross section of the first leg 4a of the cover ring 4 sealingly rests.

• – im Rohzustand – z. B. etwa 0,8 mm, während ihre Höhe
• – ebenfalls im Rohzustand – etwa 0,2 mm beträgt. Die Gesamtdicke der Schenkel 4a, 4b des Deckelrings 4 kann im vorliegenden Fall beispielsweise etwa 1,4 mm betragen. Die Umfangsvorsprünge 4c, 4d verjüngen im vorliegenden Fall
• – wiederum in dem in 4 und 5 gezeigten Rohzustand – nach oben und laufen z. B. im Wesentlichen spitz nach oben zu, so dass sie einen etwa dreieckigen Querschnitt besitzen.

Like the detail views of the cover ring 4 according to 4 and in particular according to 5 it can be seen which the cover ring 4 according to 1 to 3 show in the raw state, has the cover ring 4 at its the lid part 6 (in 4 and 5 not shown again), ie on the in 4 and 5 upper side of his second thigh 4b , two concentric circumferential projections 4c . 4d on, which protrude from its front side upwards. In this case, the radial distance of the two circumferential projections 4c . 4d

• - in the raw state - z. B. about 0.8 mm, while their height
• - also in the raw state - about 0.2 mm. The total thickness of the legs 4a . 4b of the cover ring 4 may in the present case, for example, about 1.4 mm. The circumferential projections 4c . 4d rejuvenate in the present case
• - again in the in 4 and 5 shown raw state - up and running z. B. substantially pointed upwards so that they have an approximately triangular cross-section.

The lid part 6 has a - not graphically reproduced - laminar structure with multiple layers is, on, for example - by its the lid ring ( 4 ) facing side in the direction of this opposite side - a peelable layer, z. B. from a LDPE / iPB-1 composite material, a bonding layer, a barrier layer, z. B. on the basis of EVOH, a further adhesion-promoting layer and a carrier layer, for. B. of polyethylene terephthalate (PET). Moreover, for example, optionally on the its the lid ring ( 4 ) facing side, so on the peelable layer, another sealable layer, z. B. on the basis of polyethylene, be applied. For the purpose of adequate dimensional stability and stability, the cover part thus constructed has 6 z. B. a total thickness of about 0.5 mm.

To the lid part 6 on the in 4 and 5 in the raw state illustrated cover ring 4 To seal or weld to form a gas- and liquid-tight tamper-evident closure, the lid part 6 on the particular already with the sleeve 2 of the packaging container 1 pre-connected cover ring 4 and then ultrasonically, for example at a frequency of about 10 kHz to about 50 kHz, such as 20 kHz, and over a period of about 0.5 s to about 5 s, such as 1 second to 2 seconds, excited and vibrated to the peelable layer of the lid part 6 - And / or optionally the outside thereof arranged, sealable cover layer - on the upper end side of the second leg 4b of the cover ring 4 aufzusweißen or aufzuschweißen. This can be done in particular by means of one or more sonotrodes (not shown), which from above against the lid part 6 be pressed and which expediently substantially around the entire circumference of the circumferential projections 4c . 4d of the cover ring 4 (So congruent with these) extend around to ensure proper and uniform sound transmission.

As in 3 recognizable, which the lid ring 4 in a state shows in which he already with the lid part 6 has been sealed or welded and the lid part 6 (for the first time) again from the lid ring 4 has been separated by tearing open its peelable layer, the peripheral projections 4c . 4d of the cover ring 6 During the ultrasonic sealing or welding process, at least partially melted off at least in the region of its tip (their height is therefore in comparison with the 5 less), so that there and in the area radially adjacent to the circumferential projections 4c . 4d as a result of heat conduction, a gas- and liquid-tight melt bond is produced, wherein in the regions radially adjacent to the circumferential projections 4c . 4d and especially between them where the lid part 6 during the ultrasonic welding little or no pressure contact with the cover ring 4 Although, also a fusion compound is formed, but the peelable layer is not destroyed due to significantly lower thermomechanical stress, so that they can fulfill their intended function undisturbed.

If desired, by the way, only a circumferential projection can 4c . 4d or can also have more than two circumferential projections 4c . 4d on the lid ring 4 be provided. Further, it is possible to replace the lid ring 4 the lid part 6 to provide with one or more, corresponding circumferential projections and the peelable layer in the upper end face region of the cover ring 4 to be provided (each not shown).

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2386410 A1 [0003]

Claims (15)

Cover arrangement ( 5 ) for a packaging container ( 1 ), with a lid ring ( 4 ) of a plastifiable, thermoplastic polymer material and one on the cover ring ( 4 ) attachable, form-containing cover part ( 6 ), characterized in that - the cover part ( 6 ) at its the lid ring ( 4 ) facing side comprises at least one layer of a peelable plastic material, wherein the peelable layer contains at least one sealable, thermoplastic polymer and / or coated with a cover layer of such a polymer, and that the cover ring ( 4 ) at its the lid part ( 6 ) facing end face at least one circumferential projection ( 4c . 4d ), which with the peelable layer and / or the cover layer of the cover part ( 6 ) is sealed; or - the cover ring ( 4 ) at its the lid part ( 6 ) facing side at least one layer of a peelable plastic material, wherein the peelable layer contains at least one sealable, thermoplastic polymer and / or coated with a cover layer of such a polymer, and that the cover part ( 6 ) at its the lid ring ( 4 ) facing end face has at least one circumferential projection, which with the peelable layer and / or the cover layer of the cover part ( 6 ) is sealed. Lid assembly according to claim 1, characterized in that - the lid ring ( 4 ) at its the lid part ( 6 ) facing end face at least two, in particular exactly two, substantially concentrically arranged circumferential projections ( 4c . 4d ), which with the peelable layer and / or the cover layer of the cover part ( 6 ) are sealed; or - the cover part ( 6 ) at its the lid ring ( 4 ) facing end side has at least two, in particular exactly two, substantially concentrically arranged circumferential projections, which with the peelable layer and / or the cover layer of the cover ring ( 4 ) are sealed. Lid assembly according to 2, characterized in that the radial distance of the circumferential projections ( 4c . 4d ) between 0.3 mm and 3 mm, in particular between 0.5 mm and 2 mm, preferably between 0.7 mm and 1 mm. Lid arrangement according to one of claims 1 to 3, characterized in that the circumferential projection ( 4c . 4d ) has a height between 0.05 mm and 0.4 mm, in particular between 0.1 mm and 0.35 mm, preferably between 0.15 mm and 0.3 mm. Lid arrangement according to one of claims 1 to 4, characterized in that the cross section of the circumferential projection ( 4c . 4d ) is tapered towards its free end, wherein the peripheral projection ( 4c . 4d ) in particular has a substantially triangular cross-section. Lid arrangement according to one of claims 1 to 5, characterized in that the cover part ( 6 ) has a total thickness of at least 0.2 mm, in particular of at least 0.3 mm in total, preferably of at least 0.4 mm in total. Lid arrangement according to one of claims 1 to 6, characterized in that at least the cover part ( 6 ) has at least one further layer in the form of a substantially gas- and liquid-tight barrier layer. Lid arrangement according to one of claims 1 to 7, characterized in that the cover part ( 6 ) at least one in the direction of the cover ring ( 4 ) projecting circumferential projection ( 6a ), whose cross section in such a way to the cross section of a complementary thereto contact surface of the cover ring ( 4 ) is adapted, that the cover part ( 6 ) after the first separation from the lid ring ( 4 ) on the cover ring ( 4 ) can be fixed, wherein it bears in particular its contact surface substantially sealing. Packaging container ( 1 ) with a sleeve ( 2 ), characterized in that it comprises a lid assembly ( 5 ) according to one of claims 1 to 8, whose cover ring ( 4 ) at one end of the sleeve ( 2 ), in particular substantially gas and liquid tight. Packaging container according to claim 9, characterized in that the sleeve ( 2 ) has a substantially gas and liquid-tight inner lining. Packaging container according to claim 10, characterized in that the inner lining of the sleeve ( 2 ) has at least one layer of a sealable plastic material, which with the cover ring ( 4 ) the lid assembly ( 5 ) is sealed. Method for producing a cover assembly ( 5 ) according to one of claims 1 to 8, characterized in that the cover part ( 6 ) on the cover ring ( 4 ) and the lid part ( 6 ) is excited with ultrasound, wherein the peelable layer and / or the cover layer of the cover part ( 6 ) or the cover ring ( 4 ) with the at least one circumferential projection ( 4c . 4d ) of the cover ring ( 4 ) or the lid part ( 6 ) is ultrasonically sealed. A method according to claim 12, characterized in that the cover part ( 6 ) by means of At least one sonotrode is excited by ultrasound, which at least substantially around the entire circumference of the at least one circumferential projection ( 4c . 4d ) of the cover ring ( 4 ). A method according to claim 12 or 13, characterized in that the cover ring ( 4 ) first on the sleeve ( 2 ) of a packaging container ( 1 ) is placed and then the cover part ( 6 ) with the cover ring ( 4 ) is ultrasonically sealed. A method according to claim 14, characterized in that the cover ring ( 4 ) with an inner lining of the sleeve ( 2 ), which has at least one layer of a sealable plastic material, is sealed.

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