EP4242128A1 - Lid made of paper, cardboard or paper-like material and method for producing a lid - Google Patents

Abstract

The invention relates to a lid made of paper, cardboard or paper-like material for a container (70), wherein the lid (10, 40, 50, 60, 80, 90) is made from a one-piece flat blank and a cover plate (12) and a Has a lid collar (14), the lid collar starting from an edge of the lid plate, the lid collar being formed from at least two layers of the flat blank, a first layer (22) of the lid collar extending from the edge of the lid plate to an edge of the lid collar extends and wherein a second layer (26) of the lid collar extends from the edge of the lid collar on a radially inner side of the lid collar to an edge of the second layer of the lid collar, in which the edge of the second layer of the lid collar is at least partially in a groove ( 28) is accommodated in the area of the edge of the cover plate.

Description

The invention relates to a lid made of paper, cardboard or paper-like material for a container, the lid being made from a one-piece flat blank and having a lid plate and a lid collar, the lid collar starting from an edge of the lid plate, the lid collar consisting of at least two Layers of the flat blank are formed, with a first layer of the lid collar extending from the edge of the lid plate to an edge of the lid collar and with a second layer of the lid collar extending from the edge of the lid collar on a radially inner side of the lid collar to an edge the second layer of the lid collar extends.

From the US patent specification US 2,233,489 a cover made of paper is known which has a cover plate and a cover collar projecting from the cover plate. The lid collar consists of two layers of the flat blank from which the lid is made. A first layer of the lid collar extends from the edge of the lid plate to an edge of the lid collar and forms the outer layer of the lid collar. A second layer of the lid collar extends from the edge of the lid collar on a radially inner side of the lid collar to an edge of the second layer of the lid collar. The second layer of the lid collar thereby forms the radially inner layer of the lid collar. The lid is designed to snap onto a container with a so-called mouth roll. The problem with lids made of paper, cardboard or paper-like material for a container, which are made from a one-piece flat blank, is that the second, inner layer of the lid collar must be sealed to the outer layer of the lid collar using adhesive or a plastic coating, so that the lid collar retains its shape. Plastic coatings are problematic from an ecological point of view.

The invention is intended to improve a lid made of paper, cardboard or paper-like material for a container and a method for producing a lid in such a way that the lid can be manufactured from plastic-free paper, cardboard or paper-like material.

According to the invention, a lid with the features of claim 1 and a method with the features of claim 10 are provided for this purpose. Advantageous developments of the invention result from the subclaims.

In the case of a lid made of paper, cardboard or paper-like material for a container, it is provided that the lid is made from a one-piece, flat blank and has a lid plate and a lid collar, that the lid collar starts from an edge of the lid plate, that the lid collar consists of at least two layers of the flat blank are formed, that a first layer of the lid collar extends from the edge of the lid plate to an edge of the lid collar and that a second layer of the lid collar extends from the edge of the lid collar on a radially inner side of the lid collar to a Edge of the second layer of the lid collar extends, the edge of the second layer of the lid collar being received at least in sections in a groove in the area of the edge of the cover plate.

Since the edge of the second layer of the cover collar is received at least in sections in a groove in the area of the edge of the cover plate, the edge of the second layer is mechanically fixed in the groove, in other words the cover of the cover collar, which is formed by the second layer, snaps into place , into the groove. The second layer of the lid collar is fixed simply by snapping it into place. This makes it possible to produce the lid according to the invention from uncoated paper, cardboard or paper-like material or to completely dispense with the use of adhesive in the production of the lid.

The lid according to the invention is made from paper, cardboard or paper-like material. Such lids are usually also referred to as cardboard lids. A paper-like material is a material that can be processed in a similar way to paper or cardboard. Paper or cardboard has fibers and as a result can practically not be stretched and can only be compressed to a very small extent. Paper, cardboard or paper-like material in particular cannot be deep-drawn and generally cannot be significantly deformed. For example, plastic material that cannot be stretched or can only be stretched to a very small extent is also considered a paper-like material. When producing a lid from such a paper-like plastic material, the lid must be made from a flat blank, which is then deformed as far as the paper-like plastic material allows. In other words, the lid according to the invention is always made from paper, cardboard or paper-like material in the same way, namely by deforming a one-piece, flat blank.

The lid according to the invention can be designed as a so-called attachment lid or as a so-called push-in lid. With a top lid, the inner circumference of the lid collar is larger than the outer circumference of the upper edge of a container onto which the lid is then placed. When it is in place, the lid collar surrounds it Outer wall of the container at its upper end. With a push-in lid, the outer circumference of the lid collar is slightly smaller than the inner circumference of the container at its upper end. The lid collar is therefore pressed into the upper end of the container. When attached, the outer wall of the container then surrounds the lid collar with its upper region at least in sections.

In a further development of the invention, the groove in the cover plate is designed to be circumferential.

In this way, the edge of the second, inner layer of the cover collar can be snapped and fixed over the entire circumference of the cover plate.

In a further development of the invention, the cover plate has an upper side and a lower side, with the second layer of the cover collar extending from the edge of the cover collar towards the underside of the cover plate and a circumferential projection being arranged on the upper side of the cover plate, with one of the undersides of the The groove is arranged on the side of the projection facing the cover plate.

When the circumferential projection is formed on the top side of the cover plate, the groove for receiving the edge of the second layer of the cover collar is simultaneously created on the underside of the cover plate. For example, the circumferential projection and thus the circumferential groove can be embossed or rolled into the flat blank.

In a further development of the invention, the first layer of the cover collar forms a wall of the groove.

The groove is therefore arranged directly on the outer edge and thus at the transition from the cover plate to the cover collar. The first layer and the second layer of the lid collar can therefore lie directly on top of one another in the fixed state, so that the lid collar can be made very stable and with twice the wall thickness of the flat blank.

In a further development of the invention, the groove is spaced from the edge of the cover plate.

It may make sense within the scope of the invention to space the groove from the edge of the cover plate. In this case, the cover collar still consists of two layers of the flat blank, which are spaced apart from one another on the underside of the cover plate.

In a further development of the invention, the cover plate has a top and a bottom, with the second layer of the cover collar extending from the edge of the cover collar in the direction of the Underside of the cover plate extends, with a projection extending away from the cover plate being arranged on the underside of the cover plate, the projection being spaced from the edge of the cover plate and the groove being formed between the projection and the first layer of the cover collar.

For example, the projection can be formed by making an impression from the top of the cover plate, which then forms a projection on the underside of the cover plate. The edge of the second layer of the lid collar can then be moved over this projection and snap into place behind this projection. The groove is then formed between the projection and the first layer of the lid collar.

In a further development of the invention, the edge of the second layer of the lid collar is secured in the groove using adhesive.

In this way, fixation of the edge of the second layer of the cover collar in the groove can be improved.

For example, the adhesive is designed as a hot melt adhesive.

In a further development of the invention, the flat blank from which the lid is made is not provided with a sealable plastic coating.

By mechanically fixing the edge of the second layer of the lid collar in the groove, a sealable plastic coating can be dispensed with. The lid according to the invention can thereby be produced in a very environmentally friendly manner and can, for example, be easily made from quickly biodegradable paper material.

In a further development of the invention, the cover collar forms at least one second projection on its radially inner side, which extends radially inwards.

By means of such a projection, the lid collar can be snapped onto a cup with a mouth roller or a circumferential projection projecting radially outwards. The mouth roll then lies between the second projection and the underside of the cover plate of the lid. This keeps the lid securely on the container.

In a further development of the invention, the second projection is formed by means of a bead in the first layer and/or the second layer of the cover collar.

Such a bead can, for example, be rolled or embossed into the lid collar and is particularly tailored to the dimensions of a mouth roll. The bead can, for example, also be designed such that the bead accommodates a section of the mouth roll of the container.

In a further development of the invention, a convex side of the bead lies radially on the inside.

In this way, a second projection projecting inwards in the radial direction is formed by means of the bead, the mouth roll then being able to be received between the second projection and the underside of the cover plate.

In a further development of the invention, the second projection is formed by thickening the second layer of the lid collar.

Thickening can be achieved, for example, by compressing the second layer. Thickening can also be achieved, for example, by rolling up a bead and then compressing the bead.

In a further development of the invention, the edge of the second layer of the lid collar is provided with recesses or is wave-shaped.

Such a design of the edge of the second layer reduces material tensions when the second layer is folded over. The edge of the second layer of the cover collar is then inevitably only partially fixed in the groove.

In a further development of the invention, the second layer of the cover collar has incisions extending from the edge of the second layer, with sections arranged between the incisions being arranged at least in sections extending obliquely radially inwards.

In this way, barb-like elements can be formed on the lid collar with the sections running obliquely inwards. The lid can then be pushed onto a mouth roll until the slanted sections snap behind the mouth roll. The lid is then securely fixed on the container. The sections can be designed in such a way that the cover is either not attached in a non-destructive, detachable manner or is attached in a detachable manner after overcoming a certain resistance.

In a further development of the invention, the cover collar has at least one projection extending radially outwards, in particular on its edge which is spaced from the cover plate.

In the case of a press-in lid, such a projection extending radially outwards is useful in order to form a stop which defines a maximum press-in depth of the lid when it is inserted into a container. The projection can run around the entire circumference of the lid, but this is not absolutely necessary within the scope of the invention. The circumferential and radially outwardly extending projection can, for example, be done in a simple manner by reshaping the cover collar by bending it radially outwards by 90°. For example, two opposite projections are provided, each of which extends over an angle of approximately 100° to 150°, in particular 130° to 140°, around the circumference of the lid collar. For example, a removal aid for the lid can then be arranged between these two radially outwardly extending projections.

In a further development of the invention, the cover collar has at least one projection extending radially inwards, in particular on its edge which is spaced from the cover plate.

In this way, a removal aid for a user can be provided in a very simple manner, particularly in the case of a push-in cover. The user reaches into the lid and places one or more fingers under the radially inwardly projecting projection. By moving upwards, the user can easily remove the lid.

The inwardly projecting projection can extend over the entire circumference of the lid. For example, a first, radially outwardly extending projection can be provided, which defines an indentation depth of the lid, and a second, radially inwardly extending projection can be provided, which is at a different position in the height direction than the radially outwardly extending projection is arranged. Advantageously, however, the radially inwardly extending projection only extends over a portion of the circumference and at the same height, at least one radially outwardly extending projection is provided in another portion of the circumference. For example, two opposite and radially inwardly extending projections are provided. The radially inwardly extending projections can extend over the circumference of the cover by an angle between 30° and 60°, in particular 45° to 55°.

The problem on which the invention is based is also solved by a method for producing a lid with a lid plate and a lid collar extending from the edge of the lid plate, in which the formation of a pot-like intermediate body from a flat blank made of paper, cardboard or paper-like material, the folding over of a circumferential wall of the pot-like body, so that a first, radially outer layer of the lid collar and a second, radially inner layer of the lid collar are formed, the formation of a groove in a radially outer region of the bottom of the pot-like intermediate body and the snapping at least a portion of an edge of the second layer of the lid collar are provided in the groove.

The method according to the invention can be used to produce a one-piece lid made of paper, cardboard or paper-like material, which has a two-layer, stable lid collar and which can still be produced without the use of adhesive or a sealable coating. This is because the edge of the inner second layer of the lid collar snaps into the groove and is thereby mechanically fixed. The method according to the invention can also be used together with adhesive, for example hot glue, or coated paper material. There are paper materials that have a plastic coating that provides very low holding forces when sealing. A one-piece lid can also be produced with such materials using the method according to the invention. Within the scope of the invention, the flat material for producing the lid can also be provided with a sealable dispersion coating and/or with a protective varnish against penetrating liquids. For example, the fixation of the edge of the second layer of the lid collar in the groove can also be improved by fixing the edge in the groove with adhesive. This can be an advantage, for example, if a very stable lid is to be produced. Even if the edge of the second layer of the lid collar is fixed with adhesive, the use of adhesive only supports the mechanical fixation of the edge of the second layer of the lid collar in the groove, which is already present according to the invention.

In a further development of the invention, the groove is formed in such a way that a section of the first layer of the cover collar forms a side wall of the groove.

In this way, the groove is arranged directly on the edge of the lid collar and the second layer of the lid collar can lie flat against the first layer of the lid collar.

In a further development of the invention, the groove is formed in such a way that there is a circumferential groove on an upper side of the cover plate opposite the cover collar Projection is formed, wherein the groove is arranged on a side of the projection facing the underside of the cover plate.

In a further development of the invention, the groove is formed in such a way that the projection forms the outer edge of the cover plate.

In this way, the cover plate is stabilized and the cover also has an attractive design.

In a further development of the invention, at least sections of the edge of the second layer are fixed in the groove using adhesive.

In this way, in addition to the mechanical fixation of the edge of the second layer in the groove, a cohesive fixation can be provided.

In a further development of the invention, the cover plate is formed by embossing the bottom of the pot-like intermediate body.

In this way, the cover plate can be stabilized by embossing or embossing. For example, it is also possible to provide the cover plate with an insertion opening or drinking opening and to provide impressions or embossments in order to enable drinking from the container with the lid on. For example, an impression can be provided so that any liquid that has reached the top of the cover plate runs back into the container.

Fig. 1

einen erfindungsgemäßen Deckel gemäß einer ersten Ausführungsform von schräg unten,

Fig. 2

eine Schnittansicht des Deckels der Fig. 1 von schräg oben,

Fig. 3

die Einzelheit III aus Fig. 2 in vergrößerter Darstellung,

Fig. 4

einen erfindungsgemäßen Deckel gemäß einer zweiten Ausführungsform von schräg unten,

Fig. 5

eine Schnittansicht des Deckels der Fig. 4 von schräg oben,

Fig. 6

die Einzelheit VI aus Fig. 5 in vergrößerter Darstellung,

Fig. 7

einen erfindungsgemäßen Deckel gemäß einer dritten Ausführungsform der Erfindung von schräg unten,

Fig. 8

eine Schnittansicht des Deckels der Fig. 7 von schräg oben,

Fig. 9

die Einzelheit IX aus Fig. 8 in vergrößerter Darstellung,

Fig. 10

einen erfindungsgemäßen Deckel gemäß einer vierten Ausführungsform von schräg unten,

Fig. 11

eine Schnittansicht des Deckels der Fig. 10 von schräg oben,

Fig. 12

die Einzelheit XII aus Fig. 11 in vergrößerter Darstellung,

Fig. 13

eine Schnittansicht des Deckels der Fig. 10 im aufgesetzten Zustand auf einen Pappbecher mit Mundrolle von schräg oben,

Fig. 14

die Einzelheit XIV aus Fig. 13 in vergrößerter Darstellung,

Fig. 15

den Becher und Deckel der Fig. 13 in einer geschnittenen Ansicht von leicht schräg unten,

Fig. 16

die Einzelheit XVI aus Fig. 15 in vergrößerter Darstellung,

Fig. 17

eine Schnittansicht eines erfindungsgemäßen Bechers gemäß einer fünften Ausführungsform von schräg oben,

Fig. 18

die Einzelheit XVIII aus Fig. 17 in vergrößerter Darstellung,

Fig. 19

eine Schnittansicht eines erfindungsgemäßen Deckels gemäß einer sechsten Ausführungsform von schräg unten,

Fig. 20

die Einzelheit XX aus Fig. 19 in vergrößerter Darstellung,

Fig. 21

eine Ansicht eines erfindungsgemäßen Deckels gemäß einer siebten Ausführungsform von schräg oben,

Fig. 22

mehrere der Deckel aus Fig. 21 im gestapelten Zustand,

Fig. 23

eine Schnittansicht der gestapelten Deckel aus Fig. 22,

Fig. 24

eine Ansicht eines erfindungsgemäßen Deckels gemäß einer achten Ausführungsform von schräg oben,

Fig. 25

eine Schnittansicht des Deckels der Fig. 24,

Fig. 26

die vergrößerte Einzelheit A aus Fig. 25,

Fig. 27

eine Ansicht eines erfindungsgemäßen Deckels gemäß einer neunten Ausführungsform von schräg oben,

Fig. 28

den Deckel der Fig. 27 im aufgesetzten Zustand auf einen Behälter,

Fig. 29

eine Draufsicht auf den Deckel der Fig. 27,

Fig. 30

eine Ansicht auf die Schnittebene A-A in Fig. 29,

Fig. 31

die Einzelheit A aus Fig. 30,

Fig. 32

eine abschnittsweise Schnittansicht des Behälters mit Deckel aus Fig. 28,

Fig. 33

eine weitere abschnittsweise Schnittansicht des Behälters mit Deckel aus Fig. 28,

Fig. 34

eine Ansicht eines erfindungsgemäßen Deckels gemäß einer zehnten Ausführungsform von schräg oben.

Fig. 35

den Deckel der Fig. 34 im aufgesetzten Zustand auf einen Behälter,

Fig. 36

eine abschnittsweise Schnittansicht des Deckels mit Behälter aus Fig. 35, und

Fig. 37

eine weitere abschnittsweise Schnittansicht des Deckels mit Behälter aus Fig. 35.

Further features and advantages of the invention result from the claims and the following description of preferred embodiments of the invention in conjunction with the drawings. Individual features of the different embodiments shown and described can be combined with one another in any way without exceeding the scope of the invention. This also applies to the combination of individual features without further individual features with which they are shown and/or described in connection. Shown in the drawings:

Fig. 1

a lid according to the invention according to a first embodiment from obliquely below,

Fig. 2

a sectional view of the lid of the Fig. 1 from diagonally above,

Fig. 3

the detail III Fig. 2 in an enlarged view,

Fig. 4

a lid according to the invention according to a second embodiment from obliquely below,

Fig. 5

a sectional view of the lid of the Fig. 4 from diagonally above,

Fig. 6

the detail VI Fig. 5 in an enlarged view,

Fig. 7

a lid according to the invention according to a third embodiment of the invention from obliquely below,

Fig. 8

a sectional view of the lid of the Fig. 7 from diagonally above,

Fig. 9

the detail IX Fig. 8 in an enlarged view,

Fig. 10

a lid according to the invention according to a fourth embodiment obliquely from below,

Fig. 11

a sectional view of the lid of the Fig. 10 from diagonally above,

Fig. 12

the detail XII Fig. 11 in an enlarged view,

Fig. 13

a sectional view of the lid of the Fig. 10 when placed on a paper cup with a mouth roll from diagonally above,

Fig. 14

the detail XIV Fig. 13 in an enlarged view,

Fig. 15

the cup and lid of the Fig. 13 in a sectioned view from slightly obliquely below,

Fig. 16

the detail XVI Fig. 15 in an enlarged view,

Fig. 17

a sectional view of a cup according to the invention according to a fifth embodiment obliquely from above,

Fig. 18

the detail XVIII Fig. 17 in an enlarged view,

Fig. 19

a sectional view of a lid according to the invention according to a sixth embodiment obliquely from below,

Fig. 20

the detail XX Fig. 19 in an enlarged view,

Fig. 21

a view of a lid according to the invention according to a seventh embodiment obliquely from above,

Fig. 22

several of the lids off Fig. 21 in stacked state,

Fig. 23

a sectional view of the stacked lids Fig. 22 ,

Fig. 24

a view of a lid according to the invention according to an eighth embodiment obliquely from above,

Fig. 25

a sectional view of the lid of the Fig. 24 ,

Fig. 26

the enlarged detail A Fig. 25 ,

Fig. 27

a view of a lid according to the invention according to a ninth embodiment obliquely from above,

Fig. 28

the lid of the Fig. 27 when placed on a container,

Fig. 29

a top view of the lid of the Fig. 27 ,

Fig. 30

a view of the section plane AA in Fig. 29 ,

Fig. 31

the detail A Fig. 30 ,

Fig. 32

a sectional sectional view of the container with lid Fig. 28 ,

Fig. 33

another sectional sectional view of the container with lid Fig. 28 ,

Fig. 34

a view of a lid according to the invention according to a tenth embodiment obliquely from above.

Fig. 35

the lid of the Fig. 34 when placed on a container,

Fig. 36

a sectional sectional view of the lid with container Fig. 35 , and

Fig. 37

another sectional sectional view of the lid with container Fig. 35 .

The representation of the Fig. 1 shows a lid 10 according to the invention according to a first embodiment of the invention. The cover 10 has a cover plate 12 and a cover collar 14 projecting from the cover plate 12. The lid collar 14 protrudes downwards from the lid plate 12 at an angle of 90° on the lid 10. In Fig. 1 only the underside of the cover plate 12 is visible. The lid 10 is intended to be placed on a container, usually a paper cup with a mouth roll, cf. Fig. 13 and Fig. 15 to be put on. When attached, an upper side of the mouth roll of the paper cup rests on the underside of the lid plate 12 and an inside of the lid collar 14 rests on an outside of the mouth roll.

How out Fig. 1 and for example also from the Fig. 13 to 15 can be seen, the lid 10 is designed as a so-called attachment lid, which is placed over the upper end of a container or a sleeve and especially over the mouth roll of a container. Within the scope of the invention, a cover can also be provided, which is designed as a so-called push-in cover, see the Fig. 21 to 37 . This type of lid is not placed over the sleeve or mouth roll of a container, but rather inserted into a container. To ensure that the lid, which is designed as a push-in lid, does not slip into the container, there is usually a holding element on its outside. When designing a press-in lid made of paper, the question arises as to where the cut edge of the flat blank, the so-called lid blank, should be positioned in order not to have any contact with the contents and, on the other hand, not to expose the cut edge unprotected to external environmental influences. Even with a push-in lid, the invention offers the advantage that the edge of the second layer of the lid collar is accommodated at least in sections in a groove in the area of the edge of the lid plate, so that the edge of the second layer is on the one hand mechanically locked and on the other hand simultaneously covered and is protected. In the case of a push-in lid without a plastic coating, supporting the preformed frame or the outer circumference of the lid collar on the inner wall of the container is advantageous, since the frame or the lid collar is less dimensionally stable due to the lack of the plastic coating.

The lid 10 can be used within the scope of the invention, as in Fig. 1 is shown, be circular. The scope of the invention also includes lids with a non-circular cross-section, for example rectangular with rounded ends, oval, elliptical or the like.

The cover plate 12 has a central impression 16, which is slightly recessed relative to the edge region 18 of the cover plate 12, for example recessed by 1 mm to 2 mm in the illustrated embodiment. The impression 16 serves to stiffen the cover plate 12. Instead of the depression 16, impressions with a different shape can also be provided, for example impressions to create ribs, webs or the like.

The cover plate 12 can also be provided with a drinking opening. For example, impressions or embossments can also be provided in the cover plate 12. For example, a drinking opening can be arranged at the lowest point of an impression. Marks and/or impressions can also be provided in the area of a drinking opening in order to make drinking from the drinking opening pleasant and to ensure that any liquid on the top of the cover plate 12 runs back into the container.

The lid 10 is made from a one-piece flat blank, as will be explained below. The one-piece blank consists of paper, cardboard or paper-like material. Such lids are usually also referred to as cardboard lids. A paper-like material is a material that can be processed in a similar way to paper or cardboard. Paper or cardboard has fibers and as a result can practically not be stretched and can only be compressed to a very small extent. Paper, cardboard or paper-like material in particular cannot be deep-drawn and generally cannot be significantly deformed. However, the impression 16 and any impressions or impressions in the area of a drinking opening or to stiffen the lid 10 can be introduced if they only have very small dimensions, such as the impression 16 in the illustrated embodiment with a depth of only 1 mm to 2 mm. For example, plastic material that cannot be stretched or can only be stretched to a very small extent is also considered a paper-like material. When producing a lid from such a paper-like plastic material, the lid must be made from a flat blank.

Conventional lids made of paper or cardboard are either designed in two parts, with the lid collar and lid plate being glued or sealed together using a frame. One-piece lids are usually designed with two layers in the area of the lid collar in order to be sufficiently stable. A connection of an inner layer with an outer layer is also done by sealing a plastic layer on the surfaces of the flat blank. Such plastic layers allow two layers to be sealed and thus two layers of the flat blank to be fixed to one another. However, such plastic layers are problematic when recycling because the lid then consists of two different materials. The biodegradability of the material from which the lid is made is also impaired or even completely prevented. The lid 10 according to the invention, however, can be made from uncoated paper, uncoated cardboard or uncoated paper-like material and without the aid of adhesive, which will be explained below. However, within the scope of the invention it is not excluded to use plastic-coated paper, plastic-coated cardboard or paper-like material coated with adhesive or sealing material. Within the scope of the invention, a flat blank made of paper, cardboard or paper-like material can also be used, which is provided with a dispersion coating and/or with a protective varnish against penetrating liquids for sealing purposes.

Fig. 2 shows a sectional view of the lid 10 Fig. 1 from diagonally above. It can be seen in this view that the lid 10 is made from a one-piece, flat blank and that the cover plate 12 consists of one layer of the flat blank and the lid collar 14 consists of two layers of the flat blank. At the outermost edge of the cover plate 12, a circumferential projection 20 with an approximately semicircular cross-section can be seen. To form this projection, the flat blank is deformed. This can be done, cf. also Fig. 3, by embossing from the underside of the cover plate 12 or, if necessary, by suitable compression of the flat blank. Following the projection 20, a first layer 22 of the cover collar 14 extends away from the cover plate 12. In the embodiment shown, the first layer 22 extends downwards perpendicular to the cover plate 12. On the edge 24 of the lid collar 14, which in the embodiment of Fig. 1 to 3 forms the lower edge of the cover collar 14 and thus has a maximum distance from the cover plate 12, the flat blank is folded over by 180 °. A second layer 26 of the lid collar 14 extends starting from the edge 24 of the lid collar 14 again towards the lid plate 12. In the embodiment shown, the second, inner layer 26 lies flat against the first, outer layer 22 of the lid collar 14. The second layer 26 extends to its edge. This edge of the second layer 26 is received, see also FIG. 3, in a groove 28 which is formed on the underside of the projection 20. The groove is therefore accessible from the underside of the cover plate 12 and runs around the entire edge of the cover plate 12. The second layer 26 is designed to be so long that the edge of the second layer 26 is in the Fig. 2 and 3, the upper limit of the second layer 26, can only be pressed into the groove 28 against resistance. As a result, the second location 26 will be on lower edge 24 folded over by 180 ° and snapped into the groove 28 by pressing. As soon as the edge of the second layer 26, like this in the Fig. 2 and 3 is shown, in which groove 28 is arranged, the position of the second layer 26 is fixed. No glue is required to achieve this fixation. Rather, the edge of the second layer 26 is determined by its arrangement in the groove 28 in the in Fig. 2 and Fig. 3 held position shown. The lid 10 according to the invention can thereby be produced without the aid of adhesive.

Within the scope of the invention, the fixation of the second layer 26 and especially the edge of the second layer 26 in the groove 28 can be supported by gluing in the groove 28 or by flat or partial sealing of the second layer 26 to the first layer 22 of the Lid collar 14.

The representation of the Fig. 4 shows a lid 40 according to the invention according to a second embodiment of the invention obliquely from below. Functionally identical or even identically constructed elements of the cover 40 are designated with the same reference numbers as for the cover Fig. 1 to 3 and not explained again. The lid 40 is made from a one-piece flat blank and has a lid plate 12 and a lid collar 14. The cover collar 14 extends downwards starting from a circumferential projection 20 on the edge of the cover plate 12. A first layer 22 of the cover collar 14 adjoins the projection 20. At the edge 24 of the cover collar, the flat blank is folded over by 180° and a second layer 26 of the cover collar extends again towards the underside of the cover plate 12. The edge of the second layer 26 is, see Fig. 6 , again received in the groove 28 on the underside of the projection and thereby fixed.

In Fig. 3 and Fig. 6 It can be seen that the first layer 22 forms the outer, lateral boundary of the groove 28.

The inner layer 26 is provided with a thickened section 42. This thickened section 42 runs around the entire lid collar 14 and forms a radially inwardly projecting projection. The thickened section 42 is produced, for example, by forming a groove into the second layer 26 and then pressing this groove to produce the thickened section 42. The thickened section 42 can also be produced by upsetting the second layer 26. The thickened section 42 has a predefined distance from the underside of the cover plate 12. This predefined distance is tailored to the diameter of a mouth roll of a container. The mouth roll of a container can thereby be received between the underside of the cover plate 12 and the top of the thickened section 42 facing the cover plate 12. The lid 40 can be thickened by means of the Section 42 can be locked on the mouth roll of a container, for example a paper cup.

Fig. 7 shows a lid 50 according to the invention according to a third embodiment of the invention in a view obliquely from below. To the lid 10 of the Fig. 1 Up to 3 functionally identical or even identically designed elements of the cover 50 are designated with the same reference numerals and are not explained again. The cover 50 has a cover plate 12 and a cover collar 14 which projects vertically from the edge of the cover plate 12. Like in the 8 and 9 As can be seen, a circumferential projection 20 is formed on the edge of the cover plate 12, on the underside of which a groove 28 is arranged, into which the edge of a second, inner layer 26 of the cover collar 14 can be received. The first, outer layer 22 is folded over by 180° at the edge 24 of the cover collar 14, so that the second, inner layer 26 of the cover collar extends again towards the cover plate 12.

The lid collar 14 is provided with a circumferential bead 52, which forms a projection 54 that projects radially inwards. The bead 52 is impressed, for example rolled, into the cover collar 14 from a radially outer side. On the radially outer side of the cover collar 14, the bead 52 is thus concave. On the radially inner side of the lid collar 14, the bead 52 is convex and thereby forms the radially inwardly projecting projection 54. The bead is introduced into both layers 24, 26 of the lid collar 14. Within the scope of the invention, a bead can also only be introduced into the second, inner layer 26 of the lid collar 14.

The inwardly projecting projection 54 is arranged at a distance from the underside of the cover plate 12. The mouth roll of a container, for example a paper cup, can thereby be received between the underside of the cover plate 12 and the top of the projection 54 facing the underside of the cover plate 12. The lid 50 can thereby be snapped onto a container with a mouth roll.

Due to the circular segment-shaped design of the inwardly projecting projection 54, a lid can then be easily removed from a container with a mouth roll and only with little force.

Fig. 10 shows a lid 60 according to the invention according to a fourth embodiment of the invention. With the lid 10 the Fig. 1 Up to 3 functionally identical or even identical elements of the cover 60 are designated with the same reference numerals and are not explained again.

The cover 60 has a cover plate 12 and a cover collar 14 projecting from the cover plate 12. On the top of the cover plate 12, see Fig. 11 and 12 , a circumferential projection 20 is provided, on the underside of which a groove 28 is arranged. A first, radially outer layer 22 of the cover collar 14 forms the radially outer side wall of the groove 28. The inner layer 26 of the cover collar 14 is folded over by 180 ° at the edge 24 of the cover collar 14 and extends again towards the underside of the cover plate 12 to. An edge of the second, inner layer 26 of the lid collar 14 is received in sections in the groove 28 and thereby in its position Fig. 10 to 12 position shown.

The second layer 26 is provided with a plurality of incisions 62 arranged parallel to one another, which run perpendicular to the edge of the second layer 26 in the direction of the edge 24 of the lid collar 14. Material sections lying between two incisions 62 are either arranged parallel to the first layer 22 and received with their edge in the groove 28, or sections 64 between two adjacent incisions 62 are shortened and protrude radially obliquely inwards. How good in Fig. 12 can be seen, the sections 64 protrude obliquely inwards towards the underside of the cover plate 12 and thereby form barb-like elements. Sections 64 are distributed around the entire circumference of the cover collar 14 on its radially inner side and are evenly spaced from one another.

When the lid 60 is pushed onto a mouth roll of a container, for example a paper cup, the sections 64 are first deflected outwards until they are arranged approximately parallel to the first, outer layer 22 of the lid collar 14. As soon as the mouth roller hits the underside of the cover plate 12, the sections 64 can be put back into the Fig. 10 to 12 feather out the position shown. The lid 60 is then securely attached to the mouth roll of the container. This condition is in the Fig. 13 to 16 clearly visible. It's in the Fig. 13 to 16 It is also easy to see that the lid 60 generally cannot be removed from the container 70 without being destroyed. At least some of the sections 64 will be completely bent or possibly even torn off when the container is removed. The lid 60 can thereby ensure a very secure hold on the mouth roll 72 of the cup 70.

The representation of the Fig. 17 shows a lid 80 according to the invention according to a fifth embodiment of the invention, which is essentially the same as the cup 40 of the Fig. 4 to 6 is constructed. Therefore only the differences to the cover 40 are shown Fig. 4 to 6 explained.

In contrast to the lid 40 of the Fig. 4 to 6 In the case of the lid 80, the edge of the second layer 26 of the lid collar 14 is secured by means of an adhesive bead 82 in the groove 28 on the underside of the projection 20, see Fig. 18 . The adhesive bead 82 can, for example, consist of hot-melt adhesive and can be introduced into the groove 28 on the edge 24 of the lid collar 14 before the second layer 26 is completely folded over by 180°. As soon as the edge of the second layer 26 is pressed into the groove 28, the adhesive bead 82 solidifies and thereby reliably secures the edge of the second layer 26 in the groove 28. The cover 80 can therefore be made even more stable compared to the cover 40.

The representation of the Fig. 19 shows a sectional view of a lid 90 according to the invention according to a sixth embodiment of the invention obliquely from below. The lid 90 is essentially the same as the lid 20 Fig. 7 to 9 educated. Therefore only the differences to the cover 20 are shown Fig. 7 to 9 explained.

In contrast to the lid 20 of the Fig. 7 to 9 the edge 92 of the second layer 26 of the lid collar 14 is not smooth but is provided with a wave cut, in other words wave-shaped, see also Fig. 20 . In other words, the edge 92 of the second layer 26 of the cover collar 14 has a sinusoidal shape. After the second layer 26 has been folded over by 180 ° at the location of the edge 24 of the lid collar 14, only sections of the edge 92 come into engagement with the groove 28. However, the engagement of only sections of the edge 92 in the groove 28 is sufficient to achieve a secure fixation of the second layer 26 in the in Fig. 20 to achieve the position shown. The wave shape or wave cut of the edge 92 reduces material tensions when the second layer 26 is folded over. This reduces deformations when the edge is turned over and the folding of the second layer 26 is made easier.

The sections of the edge 92 arranged in the groove 28 can additionally be secured in the groove 28 with adhesive. The two layers 22, 26 of the lid collar 14 can also be fixed to one another by sealing if the flat blank from which the lid 90 is made is at least partially coated with sealable plastic or a sealable dispersion coating. In principle, the lid 90 can also be produced without the aid of adhesive and also with an uncoated blank or simply coated with a protective varnish against penetrating liquids made of paper, cardboard or paper-like material. The snapping of sections of the edge 92 into the groove 28 ensures a secure mechanical fixation of the second layer 26 and ensures a stable design of the lid collar 14 and the lid 90 as a whole.

Fig. 21 shows a lid 100 according to the invention according to a further embodiment. The lid 100 is designed as a so-called push-in lid and is inserted into the open end of a sleeve or a container in such a way that an in Fig. 21 lower section 102 of a lid collar comes to rest on the inside of the outer wall of the container. An upper section 104 of the lid collar is expanded radially outwards. As a result, a circumferential shoulder is formed at the transition between the lower section 102 and the upper section 104, which then forms a stop when the lid 100 is pressed into the open end of a container or a sleeve, which limits the depth of the lid 100 being pressed in. The cover 100 is formed in one piece and has a cover plate 106 and the cover collar 108, which projects essentially vertically upwards from the cover plate 106.

The lid collar 108 is designed in two layers both in the lower section 102 and in the upper section 104, see also Fig. 23 . The lid collar 108 is attached to its in Fig. 21 The top edge is folded over by 180° and the folded section is then converted into an in Fig. 21 unrecognizable groove on the edge of the cover plate 106 snapped into place. Simultaneously or subsequently, the deformation of the two-layer cover collar 108 can then take place, so that the lower section 102 and the radially outwardly expanded upper section 104 are formed.

A circumferential shoulder 110 is also formed on the inside of the lid 100. This shoulder 110 serves as a stop when stacking several similar lids 100.

Fig. 22 shows a total of four similar lids 100 that are stacked one inside the other. It can be seen that the upper cover 100 can only be pushed into a lower cover 100 until the in Fig. 21 lower edge of the cover collar, which then merges into the cover plate 106, rests on the circumferential inner shoulder 110.

This is also in Fig. 23 to recognize. In this way, numerous lids 100 can be stacked without the fear that the stacked lids 100 will become wedged into one another. This is a significant advantage in particular if the lids 100 are to be removed quickly and easily from a high storage stack in order to be placed on a container filled with a drink. The lids 100 can therefore be removed with one hand even from a very high stack with numerous lids 100.

Fig. 24 shows a further cover 120 according to the invention according to a further embodiment of the invention. The lid 120 is also designed as a push-in lid, so that when placed on a container, a section 122 of the lid collar rests with its outside on an inside of the jacket of a container or a sleeve. The Lid collar 122 is based on a cover plate 124. The cover 120 is formed in one piece, see also Fig. 25 and Fig. 26 .

A groove 126 is formed on the outer edge of the cover plate 124, in which the edge 128 of the cover collar is received. Fig. 26 shows detail A of the sectional view of the lid 120 Fig. 24 and shows that the edge 128 of the lid collar is snapped into the groove 126. The cover collar 122 has a first, outer layer 130, which extends from the cover plate or the groove 126 in the cover plate. The outer layer 130 is angled at 90° relative to the cover plate 124. The lid collar 122 has a second, inner layer 132 which is arranged parallel to the outer layer 130 and which is connected to the outer layer 130 at the upper edge of the lid collar 122. The edge 128 forms the lower edge of the inner layer 132. The inner layer 132 cannot come out of the in because the edge 128 is received in the groove 126 and locked in this Fig. 26 move away from the position shown. The lid 120 can be made from uncoated paper material because the inner layer 122 of the lid collar 122 is held mechanically parallel to the outer layer 130.

The cover collar 122 has, on its edge spaced from the cover plate 124, the in Fig. 26 lies at the top, a projection 134 extending radially outwards. This projection 134 forms a stop that limits the depth of impression of the lid 120 when it is pressed into the open end of a sleeve or a container.

The lid collar 122 forms at its in Fig. 26 upper end also has a radially inwardly projecting projection 136. This radially inwardly projecting projection 136 forms a removal aid. When the lid 120 is pressed in, a user can reach under the projection 136 with one or more fingers and thereby easily pull the lid 120 upwards, away from the container or the sleeve.

To form the radially outwardly extending projection 134, the outer layer of the cover collar 130 is bent radially outwards by 90° and, after a short distance of a few millimeters, bent inwards again by 180°. To form the radially inwardly extending projection 136, the inner layer 132 is bent downwards by 90°, then guided approximately at an angle of 45° to the outer layer 130 and finally bent again so that it is parallel to the outer layer 130 up to the groove 126 runs into it. The radially inwardly extending projection 136 therefore has a significantly larger bending radius than the radially outwardly extending projection 134 and can therefore be grasped more easily with a human finger. As part of the According to the invention, it is of course also possible to design the radially outwardly extending projection 134 and the radially inwardly extending projection 136 in the same way and, for example, symmetrically to one another.

Fig. 27 shows a lid 140 according to the invention according to a further embodiment. The lid 140 is designed as a push-in lid and is also made from a one-piece, flat blank. A cover collar 142 has two radially outwardly extending projections 146, 148 in the area of its edge spaced from the cover plate 144. The projections 146, 148 are, see Fig. 31 , by bending the outer layer of the cover collar 142 by 90 ° radially outwards and then, after a short distance of a few millimeters, again by 180 ° radially inwards. In the area of the radially outwardly extending projections 146, 148, the inner layer of the cover collar is then bent downwards again by 90 ° and then runs parallel to the outer layer of the cover collar up to the groove 150 on the outer edge of the cover plate 144. The edge of the inner Position of the lid collar 142 is, see Fig. 30 and Fig. 31 , accommodated in groove 150.

The radially outwardly extending projections 146, 148 are arranged opposite one another and each only extend over an angular range of approximately 130° around the circumference of the cover 140, see Fig. 29 . Between the two radially outwardly extending projections 146, 148, two opposite and radially inwardly extending projections 156, 158 are arranged. The projections 156, 158 each form a removal aid for a user. A user can grasp one or more fingers under one of the projections 156, 158 and thereby remove the lid 140 from a container.

Fig. 28 shows the lid 140 in a state in which it closes a container 160. The container 160 is designed as a cylindrical sleeve. It can be seen that the lid 140 is pressed into the container 160 up to the radially outwardly extending projections 146, 148. The undersides of the projections 146, 148 then form a stop so that the lid 140 cannot be pushed further into the container 160. An outer surface of the lid collar 142 thereby rests in sections on the inner surface of a jacket of the container 160.

As already stated, the lid 140 can be removed from the container 160 by reaching under one or both projections 156, 158 and thereby the lid 140 in Fig. 28 is withdrawn upwards from the container 160.

Fig. 32 shows a sectional sectional view of the arrangement of the Fig. 28 . The container 160 can be seen in the area of its upper, open end. The cutting plane in Fig. 32 runs through the radially inwardly extending projection 158. The radially outwardly extending projection 148 can also be seen in sections.

The radially inwardly extending projection 158 is formed in that the outer layer of the cover collar 142 is bent radially inwards by 90 ° and, after a horizontal course for a few millimeters, for example 5 mm, is folded again radially outwards by 180 °. The projection 158 is therefore designed in two layers. The inner layer of the lid collar 142 is then again arranged parallel to the outer layer and the edge of the inner layer is received in the groove which is arranged on the outer edge of the lid plate 144.

Fig. 33 shows a section through the arrangement of the Fig. 28 , whereby the cutting plane runs through the projection 148 which extends radially outwards. It can be seen that the outer surface of the lid collar 142 lies flat against the inner surface of the outer wall of the container 160. It can also be seen that the lid 140 is pressed so far into the container 160 that the underside of the radially outwardly extending projection 148 rests on the upper edge of the outer jacket of the container 160.

Fig. 34 shows a lid 170 according to a further embodiment of the invention. The lid 170 is designed as a press-in lid and is made from a one-piece, flat blank. The lid 170 is constructed very similarly to the lid 140, which is already based on the Fig. 27 to 33 was described. In the following, only the differences to the cover 140 will be explained.

Fig. 35 shows an arrangement with a container 160, which is designed as a cylindrical sleeve with a circular cross section. The lid 170 is pressed into the upper, open end of the container 160.

The lid 170 has a lid collar 172, the lid collar 172 having a lower section 174, the outer circumference of which is smaller than the inner circumference of the container 160 and the same size as the inner circumference of the container 160. The lid collar 172 has an upper section 176, which was deformed radially outwards and thereby forms two opposite projections 176, 178. At the transition of the lower section 174 of the cover collar 172 into the radially outwardly expanded upper section, the underside of the projections 176 forms a shoulder or a stop, which Shoulder limits the depth of impression of the lid 170 into the container 160. This radially outwardly extending shoulder 180 runs around the entire circumference of the lid collar 172.

Between the radially outwardly extending projections 176, 178, two radially inwardly extending projections 182, 184 are arranged opposite one another. These radially inwardly extending projections 182, 184 serve as a removal aid. A user can reach under one or both of the projections 182, 184, see Fig. 35 , and thereby pull the lid 170 upwards from the container 160.

Fig. 36 shows a sectional sectional view of the arrangement of the Fig. 35 , with a cutting plane running through the radially outwardly extending projection 178. It can be seen that the shoulder formed at the transition between the lower section of the lid collar 172 and the upper section of the lid collar 172 and extending radially outwards forms a stop up to which the lid 170 can be pressed into the open end of the container 160 can.

Fig. 37 shows a sectional sectional view of the arrangement of the Fig. 35 , whereby the cutting plane runs through the radially inwardly extending projection 180. The radially outwardly extending projection 178 can also be seen in sections.

As stated, the shoulder between the lower portion of the lid collar 172 and the upper, radially outwardly deformed portion of the lid collar 172 extends around the entire circumference of the lid 170. The lid 170 therefore sits reliably on the container 160 and can therefore also seal it reliably.

As well in Fig. 36 as well as Fig. 37 It can be seen that a cover plate 188 has a groove 190 on its outer edge, in which the edge of the inner layer of the cover collar 172 is received and thereby mechanically locked.

The lid 170 can also be made of uncoated paper material, like the lids 100, 120, 140 already described.

When producing the covers 10, 50, 60, 40, 80, 90, 100, 120, 140, 170 according to the invention, a one-piece, flat circular blank is first deformed into a pot-like intermediate body. The flat cutting is when producing a circular lid, as shown in the Fig. 1 to 37 is shown, circular. When producing a lid with a different shape, for example rectangular or oval, the flat cut obviously has a different one Shape. After forming the pot-like intermediate body, the circumferential wall of the pot-like body is folded or folded over in such a way that a first, radially outward layer of the lid collar and a second, radially inner layer of the lid collar are formed. The wall of the pot-like body can be folded over by 180°, but does not necessarily have to be folded over by 180° within the scope of the invention. Angles smaller than 180° are possible.

Before or after the circumferential wall of the pot-like body is folded over or even before the pot-like body is formed, a groove is formed in a radially outer region of the bottom of the pot-like intermediate body. This can be done, for example, by embossing a circumferential groove into the still flat, flat blank. After the circumferential wall of the pot-like body has been folded over, an edge of the second layer of the lid collar is then snapped into this groove. The second layer is thus fixed in its position, even without the use of glue.

The groove can be formed in such a way that a portion of the first layer of the lid collar forms a side wall of the groove. The groove is therefore arranged directly on the edge of the cover plate.

Within the scope of the invention, the groove can also be formed somewhat inside the outer edge of the cover plate. The second layer of the lid collar is then folded over not by 180°, but by a smaller angle. The groove does not necessarily have to be stamped or formed from the underside of the cover plate. For example, the groove can also be formed between a projection projecting beyond the underside of the cover plate 12 and the inside of the first layer of the cover collar.

In the method according to the invention, the groove can be formed in such a way that a circumferential projection is formed on an upper side of the cover plate opposite the cover collar, the groove being arranged on a side of the projection facing the underside of the cover plate. This projection can form the outer edge of the cover plate and thereby simultaneously contributes to stiffening the cover plate.

The edge of the second layer can be fixed at least in sections in the groove using adhesive. For example, an adhesive bead of hot melt adhesive can be introduced into the groove before the edge of the second layer snaps into place.

When producing the lid according to the invention, the lid plate can be shaped by embossing the bottom of the pot-like intermediate body. For example, impressions or embossments can be made in order to stiffen the cover plate or, for example, to attach a drinking opening or simply to attach a perforation, in the area of which a drinking opening can then be attached by a user. Projections that extend radially outwards or radially inwards can also be formed on the cover collar.

Claims (15)

Lid made of paper, cardboard or paper-like material for a container (70), the lid (10; 40; 50; 60; 80; 90) being made from a one-piece flat blank and a lid plate (12) and a lid collar (14) has, wherein the lid collar (14) starts from an edge of the lid plate (12), the lid collar (14) being formed from at least two layers of the flat blank, with a first layer (22) of the lid collar (14) starting from the edge the cover plate (12) extends to an edge of the cover collar (14) and a second layer (26) of the cover collar (14) extends from the edge of the cover collar (14) on a radially inner side of the cover collar (14) up to an edge of the second layer (26) of the cover collar (14), characterized in that the edge of the second layer (26) of the cover collar (14) is received at least in sections in a groove (28) in the area of the edge of the cover plate (12). is. Lid according to claim 1, characterized in that the groove (28) in the cover plate (12) is formed circumferentially. Lid according to claim 2, characterized in that the first layer (22) of the lid collar (14) forms a wall of the groove (28), in particular the groove being spaced from the edge of the lid plate. Lid according to one of the preceding claims, characterized in that the edge of the second layer (26) of the lid collar (14) is secured in the groove (28) by means of adhesive, in particular the adhesive being designed as a hot-melt adhesive. Lid according to one of the preceding claims, characterized in that the flat blank from which the lid (10; 40; 50; 60; 80; 90) is made is not provided with a sealable plastic coating. Lid according to at least one of the preceding claims, characterized in that the lid collar (14) forms on its radially inner side at least one second projection (42, 54) which extends radially inwards, in particular the second projection (54) by means of a bead (52) is formed in the first layer (22) and/or the second layer (26) of the cover collar (14), in particular a convex side of the bead (52) being located radially on the inside or wherein in particular the second projection (42) is formed by means of a thickening of the second layer (26) of the lid collar (14). Lid according to one of the preceding claims, characterized in that the edge (92) of the second layer (26) of the lid collar (14) is provided with recesses or is wave-shaped and/or that the second layer (26) of the lid collar (14) has incisions (62) extending from the edge of the second layer (26), sections (64) arranged between the incisions (62) being arranged partially and at least in sections extending obliquely radially inwards. Lid according to one of the preceding claims, characterized in that the lid collar, in particular on its edge spaced from the lid plate, has at least one projection extending radially outwards. Lid according to one of the preceding claims, characterized in that the lid collar, in particular on its edge spaced from the lid plate, has at least one projection extending radially inwards. Method for producing a lid (10; 40; 50; 60; 80, 90) with a lid plate (12) and a lid collar (14) extending from the edge of the lid plate (12) according to at least one of the preceding claims, characterized by forming a pot-like Intermediate body made of a flat blank made of paper, cardboard or paper-like material, folding over a circumferential wall of the pot-like body, so that a first, radially outer layer (22) of the lid collar (14) and a second, radially inner layer of the lid collar (14) is formed, forming a groove (28) in the flat blank, in particular in a radially outer region of the bottom of the pot-like intermediate body, and snapping at least a portion of an edge of the second layer (26) of the lid collar (14) into the groove (28). A method according to claim 10, characterized by forming the groove (28) in such a way that a portion of the first layer (22) of the lid collar (14) forms a side wall of the groove (28). Method according to claim 10 or 11, characterized by shaping the groove (28) in such a way that on an upper side of the cover collar (14) opposite A circumferential projection (20) is formed on the cover plate (12), the groove (28) being arranged on the underside of the projection (20). Method according to claim 12, characterized by shaping the groove (28) in such a way that the projection (20) forms the outer edge of the cover plate (12). Method according to one of claims 10 to 13, characterized by fixing at least portions of the edge of the second layer (26) in the groove (28) using adhesive. Method according to one of claims 10 to 14, characterized by shaping the cover plate (12) by embossing the bottom of the pot-like intermediate body.

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