EP2109569B1 - Peel resistant and tear resistant closure lid with lid ring - Google Patents

Abstract

A lid is proposed. The lid has a lid ring (10) which is connectable to a container edge by means of rims or grooves and which has an outer rim edge (11), and a fastening flange (13) connected to the lid ring by means of a core wall (12) and which borders on a lid opening (15a). Thereon a closure film (15) which tightly seals the lid opening but which can be pulled away to uncover the opening is fastened by its edge area by an adhesive or a heat sealing (17). The closure film has a gripping flap (3) for the initiation and carrying out of the removal process, and the closure film (15) has ears (16) protruding outward at selected edge areas above the fastening area (17) of the film on the flange (13) of the lid ring (10) for the promotion of the removal process and for the prevention of tearing of the film edge during the removal process. Without requiring stronger and thicker materials for the closure film, a tearing of the film is largely avoided.

Description

The invention relates to a lid for hulls of containers, which lid has a lid ring for tight and tight bonding (Anfalzen) with the edge of the container, and for this purpose has an outer beaded edge which is connected via a core wall with an inner flange, the with its inner edge (or end) delimits a lid opening, which in turn can be closed tightly by means of a matched sealing foil, which close to its edge on the flange of the lid ring, eg by gluing or heat sealing or the like, is fixed so that it can be pulled off from the flange for opening by means of a grip tab formed at a circumferential location of the sealing foil. The container is opened when the lid is already folded on it, in concrete, however, the lid is opened, with the sealing film is peeled off.

However, practice has shown that peeling off the entire film often results in difficulties, depending on the shape and size of the opening and the performance of the peeling operation. These consist in the fact that the peeling operation is inhibited at certain points of the circumference of the opening or stops or the edge of the film when the peeling process reaches certain peripheral locations of the film or sealing seam breaks.

One can partially avoid these difficulties when using thicker, stronger closure films. However, this increases the cost of such covers and also complicates the processing and handling or sealing of the closure films.

document US-A-3 380 622 discloses a deexer with a closure foil having a gas bottle.

It is an object of the invention to avoid the difficulties indicated as far as possible in a simple manner, without requiring stronger and thicker materials for the closure film. In this case, the solution for each outline shape and size of a lid opening can be applied, in particular for such an opening in a cover ring.

This object is solved by claim 1.

For this purpose, existing experiences are used to conventional closure films, which teach that the above-mentioned problems usually occur at certain, narrow limited peripheral regions of the sealing film (as "edge points") during the peeling operation of the sealing film.

The proposals of the independent claims are closely related. They differ, however, because the behavior of the closure films in the removal process depends mainly on their format (round, angular, oval, oblong (Hansa), or elongated). The placement of the ears on selected edge areas remains nevertheless common.

In any case, conventional sealing foils of small thickness below 100 μm can be used, so that the costs remain limited. These may be aluminum foils, sealable polymer foils or multilayer foils of different materials.

The self-disclosed sealing film (without cover ring, but suitable to be sealed on it) has at least two spaced from the grip tab on one side edge locations each outwardly projecting ear-shaped lobe piece or each projecting piece of film. They protrude beyond the normal boundary. The edge locations are selected to promote a continuous stripping operation and / or to block or prevent tearing of the closure film at the edge locations with the flap or film pieces inward.

Also disclosed are manufacturing methods for and method of operation of the lid when tearing the sealing film of the independent claims (claim 18 and 19).

The lid has in one embodiment a connectable to the container edge by folding lid ring with outer bead and connected to this by a core wall, a lid ring opening of any outline limiting mounting flange. Then one of the contour shape of the opening adapted and this tightly closing, but removable to expose the opening fastener film attached The attachment is made with the edge region, the peelable sealing film by gluing, heat sealing or the like. The sealing film has at a first edge region an outwardly projecting gripping tab for initiating and carrying out the peeling process, wherein the sealing film over the entire circumference or outer edge of the film reaching over the attachment area to promote the peeling process and to prevent the tearing of the film edge during the peeling process also has projecting edge strips.

In another embodiment, the cover has a cover ring which can be connected to the container edge by folding and has an outer flanged edge and a fastening flange connected to it by a core wall and defining a substantially circular or oval or long oval cover opening (claim 12). Then a lid opening tightly closing, but removable to expose the opening closure film with its edge region is adhesively secured by gluing or heat sealing. The closure film has at one circumferential location - in the case of an oval opening, in particular centrally at an arcuate end region of the closure film - an outwardly protruding grip tab for initiating and carrying out a removal operation. The sealing film has at a predetermined or given angular distance, in particular at an angular distance of between 10 ° and 60 °, on both sides of a median plane of the grip tab on the mounting portion outwardly projecting pieces of film.

The lid has in yet another embodiment a connectable with a container edge by folding lid ring with outer fold edge (beaded edge) and connected to this by a core wall, a substantially square or rectangular lid opening limiting mounting flange on which the lid opening tightly closing, but for Exposing the opening removable Closing film with its edge region by gluing, heat sealing or the like. Fabric closure is attached. The closure film has at a corner portion a diagonally outwardly protruding tab for initiating and carrying out the peeling operation, the closure film being used to promote the peeling operation and to prevent tearing of the film edge during a peeling operation at the edges or sides emanating from the corner region a predetermined angular distance on either side of a diagonally oriented center line of the handle tab - over the mounting portion of the closure film on the cover ring - outwardly projecting pieces of film.

Figur 1

in Draufsicht eine Verschlussfolie 1 für einen Deckelring mit kreisrunder Innenöffnung.

Figur 1a, Figur 1b

sind Ausschnittsvergrößerungen und Variationen eines Bereichs 7a als 7a' und 7a".

Figur 2

im Querschnitt und perspektivischer Ansicht einen Ausschnitt eines Deckels mit Deckelring 10 aufgesiegelter Verschlussfolie 15.

Figur 3

zeigt eine gegenüber Figur 2 abgewandelte Ausführung im Querschnitt.

Figur 4

in Draufsicht eine Verschlussfolie 26 für einen Deckel mit lang-ovaler Deckelöffnung.

Figur 5

eine Draufsicht auf eine Verschlussfolie 35 für einen Deckel mit rechteckiger Deckelöffnung.

Figur 4a, Figur 5a

sind funktionelle Erläuterungen zu Figuren 4 und 5.

Figur 6

veranschaulicht einen Abziehvorgang bis zu der Stelle, wo die Folienstücke 7a*, 7b* beginnen.

Figur 7

in Draufsicht eine Verschlussfolie 15' für einen Deckelring mit im Wesentlichen runder Innenöffnung, wobei die Bereiche der Platzierung der Randerweiterungen ("ohrförmige Lappen") verdeutlicht werden.

The invention is described below with reference to schematic drawings of several embodiments. Show it

FIG. 1

in plan view a closure film 1 for a cover ring with circular inner opening.

FIG. 1a, FIG. 1b

are detail enlargements and variations of a region 7a as 7a 'and 7a ".

FIG. 2

in cross section and perspective view a section of a lid with lid ring 10 sealed sealing foil 15th

FIG. 3

shows one opposite FIG. 2 modified version in cross section.

FIG. 4

in plan view a closure film 26 for a lid with a long-oval lid opening.

FIG. 5

a plan view of a closure film 35 for a lid with a rectangular lid opening.

Figure 4a, Figure 5a

are functional explanations to FIGS. 4 and 5 ,

FIG. 6

illustrates a peeling operation to the point where the pieces of film 7a *, 7b * begin.

FIG. 7

in plan view, a closure film 15 'for a cover ring with a substantially round inner opening, wherein the areas of placement of the edge extensions ("ear-shaped tabs") are illustrated.

The general structure of a lid for cans or the like. Container body, consisting of a aufbördelbaren on the body lid ring and the opening tightly closing, peelable sealing film is well known and need not be described in detail here. The essential features of such a lid are the FIG. 2 refer to. This shows in section and in a perspective view the cover ring 10, which has an outer fold edge 11 for connection to the Rumpfrand (also called: flanged edge 11).

The flanged edge 11 passes over a core wall 12 in a center of the lid aligned flange 13 (strip), whose inner edge has a curl 14 which determines the lid opening 15a of the shape and size. As a rule, the shape and size of the lid ring opening are based on the cross-section - size and shape - of the container body.

On the flat portion of the flange 13 is with its edge region, the sealing film 15 (or 1 in FIG. 1 ) by adhesive bonding, heat sealing or the like. Flushing liquid-tight, but peelable attached, as by the connecting strip 17 in FIG. 2 is indicated. To facilitate the removal is on the sealing film in FIG. 1 formed at one circumferential location an outwardly projecting film strip 3, which at the same time indicates the pulling direction 5 for the opening by its longitudinal extent. This basic construction of the lid applies to all embodiments and will be referred to repeatedly in the following description.

As already emphasized in the introduction to the description, the experience with such lids shows that disturbances occur again and again when removing the sealing foil. Thus, there are peripheral locations along the fastening seam, at which the stripping process is suddenly braked or stopped when the film is peeled off and / or a sudden resistance causes the film edge of the closure film to tear. These defects occur at the different formats and sizes of closure films at often different locations. However, experience shows that these bodies usually have the same position for the same size of the sealing film, the position shifting only slightly with the same size but different sizes.

In-depth experiments have now shown that these disturbances can be largely avoided in a simple manner, without the strength of the material of the sealing film needs to be increased, so that no higher material costs incurred.

FIG. 1 shows at the example of a closure film 1, which is shown for a circular lid opening of medium size, at the recognized from experience points of the film periphery 1 a at least two ear-shaped tabs 7a and 7b, the few millimeters above the outer edge of the strip-shaped connecting portion 4 of the film (in FIG. 2 Sealing strip 17) between the film 1 (or 15) and flange 13 of the cover ring 10 outwardly loose, so not glued to the cover ring, projecting. These "ears" are integrally formed extensions of the film beyond its "normal perimeter".

In FIG. 2 For example, such an ear-shaped lobe 16 (regardless of the size and size of the lid opening 15a) is generally shown. It essentially projects up to the core wall 12, so as not to disturb later machine connection operations between lid edge 11 and - not shown - hull edge. The normal edge (or circumference) of the film 15 is 15b. The edge is extended at the edge points to ears 7a, 7b, which are also called pieces of lobes 16 or pieces of film.

at FIG. 1 is the edge 1 a of the round cut out closure film. 1

In the example according to FIG. 1 is based on the experience that in closure foils for substantially circular lid openings medium format (diameter between 50 mm and 200 mm), the impurities in the area on both sides of the handle tab 3 are located at an angular distance 8 (or α in FIG. 7 ) of the median plane 6 of the grip tab, which also determines the direction of tearing 5, of about 45 °. In each case, a protruding, ear-shaped piece of film 7a or 7b, which has a substantially rounded or rectangular shape, is formed at the closure film 1. The circumferential width of these pieces of film is selected so that the film piece 7b or 7a covers the respective defect sufficiently far before it is reached when it is torn open and after it has passed.

In FIG. 1 is the normal edge of the sealing film designated 1 a and the connecting strip indicated at 4.

That in the FIG. 1 additionally recognizable ear-shaped film piece 7c should facilitate the positioning or placement of the film 1 when applying the film on the cover ring. It is placed symmetrically between the film pieces 7a, 7b, the gripping bottle 3 opposite.

about FIG. 3 further, advantageous embodiments are shown.

One measure for facilitating the peeling is to allow the flange 13a of a lid ring 10a to rise from the lower end of the core wall 20 rising to the flanging edge 19 to its inner, curled edge 21a bounding the lid opening 25a at an angle φ.

A preferred range of angles φ is between 5 ° and 25 ° or 10 ° and 25 °, more preferably between 10 ° and 15 °. Shown is an angle of substantially 11 ° (for deviations of ± 10%).

This facilitates the start of the peeling operation and makes it difficult to automatically detach the film 25 from the flange 13a under the resulting internal pressure during sterilization of the sealed container.

A second detail is the in FIG. 3 shown possibility, bow-shaped film-shaped pieces 16a outside the connecting strip 25a to reform. This may enhance their function of preventing the occurrence of the above-mentioned incidents when peeling off the film 25 along the sealing strip 17. It is additionally edge-resistant. It covers in the sealed state an opening 25a of the cover ring 10a.

In the FIGS. 4 and 5 The invention will be explained using the example of other forms of the lid opening and thus the closure films. It should be noted, however, that also the position of the tightening direction determining gripping tab 27 or 36 on the location of regularly occurring impurities influence.

FIG. 4 shows a closure film 26 for a lid with long-oval lid opening. The cover ring is formatted accordingly and not shown. Here, the grip tab 27 is formed centrally on the arcuate portion 26 a of one end of the film 26. At the same time it determines the direction 28 of winding. For orientation in the placement of the film, a tab 31 is formed on the film circumference with respect to the tab 27. Experience shows that the defects occurring in this format lie in the sheet area of the film edge having the tab 27 and at similar angular intervals 30 as in the case of a circular film (FIG. FIG. 1 ). Therefore, ear-shaped pieces of film 29a and 29b are formed at the corresponding locations, here in a semicircular shape of a respective film piece.

In a rectangular lid opening and closing film 35 according to FIG. 5 the grip tab 36 is preferably formed on a foil corner in the diagonal direction 37. Experience shows that when the films are peeled off, the first defects occur on both sides of the grip tab on the film edges 38, 39, namely at locations which have comparable distances from the diagonal, as in the case of the circular or oval films.

Therefore, the film 35 at the appropriate locations ear-shaped pieces of film 40 and 41, here substantially semicircular or trapezoidal. For square or rectangular films, further disturbances may occur at the corner regions at the ends of edges 38 and 39, respectively, starting from the grip tab. Therefore, two further ear-shaped pieces of film 42 and 43 are provided on the film 35, each extending around the respective corner region.

The transfer of the angular range or preferred angular ranges 8 and 30 from those embodiments having at least half or all round shapes for the closure film 26 or 1 or 15 or 25 to those embodiments which are rectangular or square requires consideration by one skilled in the art. the basis of the FIGS. 4a and 5a is explained. The transfer of the preferred angular ranges of> 10 ° and <65 °, in particular on the 180 ° angle range in or on which the grip tab lies, in an angular region, like him FIG. 5 shows, requires a brief consideration, since the center of a circle is not directly fixed here, but is evident only in a meaningful consideration.

The FIGS. 4a and 5a are the representation of FIGS. 4 and 5 , unchanged, only with additional guides, which is the transmission of an arc of the FIG. 4a on an angular area of FIG. 5a allows. The arcuate portion 26a at an end portion of the elongated (long-oval) sealing film shows that definition of the center is possible where the diameter of a hypothetical full circle would be approximately or the end of the arc portion 26a is reached, and it a rectangular course passes.

Here is an angle 30 to the left and an angle 30 plotted to the right, which determines the position of the edge points, and to these the ears 29b and 29a are arranged. at FIG. 5a There is no bow in the corner area with the grip tab 36, but only two straight edges 38 and 39, which extend from the corner area with the grip tab 36. But there is a diagonal pulling direction 37, which is named as a diagonal and on it lies the center M.

The definition of the center point is determined by the intersection of the diagonal 37 with the other diagonal defined by the far corner region 42, assuming a square shape of the closure film 35. This is indicated by the vertical dashed line with the reference "end".

Here, the film edges 38 and 39 are the same length, the other diagonal 37 'passes through the corner 42 (and through the other hypothetical corner top left opposite). The diagonal 37 cuts this Hilfsdiagonale 37 'at the center M, and when the circle or arc K is then pulled through the corner where the grip tab 36 is located, the resulting rays S1 and S2 result as position information for the two ears 40 and 41st

This will eliminate the angular ranges FIG. 4a or FIG. 1 on FIG. 5a , respectively their underlying FIG. 5 transfer.

In the case of the square lid opening, or its associated square shape of the sealing film, the angular distance is dimensioned such that on both sides of the diagonally oriented center line 37 which defines the grip tab, the circle or arc K is provided with a center M which on the other diagonal 37 ', which other diagonal runs as auxiliary diagonal through the adjacent corner regions. Shown is the corner region 42 and assumed is the corner region 42 '. The midpoint is the intersection of 37 and 37 '. The radius R1 of the circle K is selected so that it passes through the corner region which forms the grip tab 36.

The same applies to the rectangular form, which in FIG. 5a is shown in addition. Here, the auxiliary line "end" is not relevant, but the auxiliary diagonal 37 'remains and then it passes through only one corner region 42, is perpendicular to the other diagonal 37, and defined on the circle K a radius R1 so that it through the Corner area runs with the grip tab 36. The film pieces 40,41 and their position at the marginal edges 38 and 39 are defined as a section of circle K and beam S1, S2.

It should be noted that in the rectangular shape of the sealing film 35, in which the peripheral edge 38 is longer than the peripheral edge 39, the film pieces 40 and 41 do not have the same angular distance from the grip tab 36, but quite the piece of film 40 a larger angle ( over beam S1) can have as the Angular measurement, which is defined by the auxiliary line S2, in particular corresponding or proportional to the length of the peripheral edges 39 and 38, respectively.

In a range of between 10 ° and 60 °, in particular in the upper hemisphere range of 180 °, these angle pieces 40, 41 but also in the rectangular version are arranged (relative to the auxiliary diagonal 37 ').

As dashed in FIG. 5 indicated, a strip-shaped extension 35a of the film 35 may not be shown on its fastening strip (not shown) on a flange of the cover ring (not shown) out, which extends over a substantial or the entire circumference of the film 35. This solution is recommended for unusual formats of the lid opening, for which there is still insufficient experience of the location of the impurities to be expected. However, as far as possible, the specifically intended limited ear-shaped lobes are preferred as locally limited expansions of the film.

Examples of these ears 7a, 7b are also from the FIGS. 1a and 1b seen from the film pieces 7a, 7b of FIG. 1 have arisen in a changing manner. They have wider peripheral and narrower peripheral boundaries. The wider shape 7a 'approximates a rectangle, the narrower shape 7a "approximates a finger-like shape Both shapes are also considered" ears "and are considered as the ears for both foil piece 7a and foil piece 7b FIG. 1 , which are shown there rather semi-circular in the design.

Seen from the FIG. 1 and the FIG. 4 is that the spaced edge points, located on both sides of (and on both sides of) the grip tab 3 or 27 are located in an angular range, which can be specified with 180 °. This angle range lies on the side of the respective grip tab. In a particular embodiment, the edge locations which carry the ears are arranged at least 10 ° away on both sides of the grip tab, but preferably at a larger angle, in the range between 20 ° and 60 ° on both sides of the grip tab, in particular in the range of 30 °. The exact angular position of the embodiment of FIG. 1 is at substantially 45 °, left and right of the handle tab 3, and in accordance with the FIG. 4 showing similar angular intervals 30 as in the circular form of FIG. 1 ,

To carry out the FIG. 3 the inclination of the flange 13a was mentioned. The angle was given by phi (φ). The "horizontal" is the horizontal plane (dashed in FIG. 3 ). The mentioned embodiments and areas of inclination of the Flange of the cover ring refer to all preferred areas of the edge locations where the ears are provided as projecting pieces of film, in particular any combination of these areas.

If the pieces of film are only in pairs, especially in pairs in the angular range of 180 ° on the side of the grip tab, a minimum of projecting pieces of film is required. A third piece of film may be provided substantially opposite the gripping tab, but not in the angular range of 180 ° on the side of the grip tab. Furthermore, not more than two of the pieces of film can be provided on this side of the grip tab, however, a third piece of film can nevertheless be arranged on the opposite angular range of 180 °. The latter film piece 7c facilitates the positioning of the film 26 or 1, but does not directly participate in the improvement of the tearing behavior and the elimination of the disturbances occurring during this tearing.

The shape of the foil pieces may be substantially semicircular, they may be substantially rectangular in shape, if they are more pronounced in the circumferential direction, but are nevertheless provided in the circumferential direction limited in their extension. If they are narrower than the semicircular embodiments, finger-shaped formations result FIG. 1 b.

Special shapes in a direction perpendicular to the circumferential direction is the end-side bulge 16a after FIG. 3 , The ears as circumferentially limited pieces of film are thereby bulged end, so that they provide greater security against the occurrence of the mentioned incidents, in addition, they can be edge-resistant.

The projecting pieces of film as ears are preferably integrally connected or formed with the closure film, so that they result in a coherent piece of film, which is already formed in its respective blank as a form with the projecting film pieces as ears, and preferably also the opposite further film piece 7c, which extended the "normal edge" of the sealing film radially ('laterally' in square shapes).

FIG. 6 FIG. 11 illustrates the peeling operation in a top view, which peeling operation has just arrived at the point where the film pieces 7a * and 7b * correspond to the one FIG. 1 kick off. At this point is to be expected in this embodiment with disturbances in the tearing process, so that here the gains of the edge region by outwardly projecting pieces of film as Ears 7a *, 7b * are provided. Obviously, the grip tab 16, the partially opened cover ring opening 15a, the closing film 15, the cover ring outer edge 11 suitable for folding after FIG. 2 (or 19 after FIG. 3 ), and the mounting direction 5, the off FIG. 1 mutatis mutandis FIG. 2 can be transferred. After the partial opening, the remainder of the sealing strip 17 remains on the flat flange 13 FIG. 2 or in inclined form 13a after FIG. 3 ,

FIG. 7 illustrates preferred angular ranges.
α (alpha) is greater than 3 °, in particular in the range of 10 ° to about 60 °, preferably between 40 ° and 65 °. γ (gamma) is greater than 1 °, in particular in the range of 5 ° to 20 °. β (beta) is 180 ° minus α (alpha).
The extent x, y of the respective piece of film is dependent on the diameter (generally the area) of the sealing film in the y direction, greater than 0.1 mm in the y direction, and in particular less than 3 mm.

This results in surface dimensions of the projecting pieces of film outside the normal scope of the sealing film, which are between 2 mm ² to 60 mm ² .

This information refers to round sealing foils, which have a diameter between 40 mm and 250 mm.

A distinction is made between different diameters of the film, which are called radius in FIG. 7 R1, the dimensions x and y of the two ears 7a 'and 7b' may be provided relatively constant a dimension of substantially 0.7 mm in the x-direction and substantially 10 mm in the y-direction (circumferential direction), whereby they are designed substantially rectangular. These measurements are guidelines, not exact limits.

The angle α varies for increasing diameters, so that it can generally be stated that as the diameter increases, the angle α also becomes larger.

Tests and measurements have shown that the defects are in the following ranges of angles, given with tolerances of ± 15%. Diameter 2R1 Angular measure α 40mm 43 ° 62mm 52 ° 81mm 55 ° 97mm 58 ° 250 mm 65 °

For the above value measurements of the angular dimensions α and the diameter dimensions, in a preferred example all ear dimensions 7b 'and 7a' can have the same absolute size dimensions, essentially 0.7 mm in the radial direction and substantially 10 mm in the circumferential direction. These dimensions are to be understood as guidelines only, not as exact limits.

The dimension R2 results from the aforementioned dimension R1 and the x dimension of the ears 7a ', 7b'. In appropriate training, the third ear 7c 'dimensioned in similar dimensions, based on the circumferential direction and radial direction, only where these extensions of the sealing film does not necessarily have to have the same dimensions as the other two ears, as another functional basis for the ear 7c ' is provided.

In a similar transfer of FIG. 2 and FIG. 1 on the FIG. 7 is the outer normal edge of the closure film 15b ', and the grip tab is designated 3'. The sealing film itself is 15 ', based on the sealing film 15 of FIG. 2 , and the median plane or line 6 of the grip tab.

Claims (21)

1. A seamable lid with lid ring, suitable for seaming onto a seaming edge of a can body, wherein

   - the lid ring (10, 10a) comprises an outer seaming edge (11, 19) as the edge for seaming, which leads to a lid ring opening (15a) via a core wall (12, 20) and a fastening flange (13, 13a) that is inclined vis-à-vis a horizontal plane;

   - a closure film (1, 15) is disposed in a peelable fashion on the fastening flange (13, 13a) by means of a thermal sealing, the sealing extending along the entire opening (15a) of the lid ring (10, 10a) as a sealing strip (17);

   - the closure film (15, 1) comprises a gripping flap (3; 27; 36, 16) at one point of its edge (1a, 15b) for introducing tensile force for implementing a peeling process of the closure film, during which the sealing strip (17) is undone;

   - the closure film comprises one outwards projecting flap piece (16) each or one protruding film piece (7a, 7b) each on at least two edge points spaced from the gripping flap (3) to one side each, which project beyond the sealing strip (17), wherein the position of the edge points promote a continuous peeling process and/or blocking or preventing a tearing of the closure film (15, 1) towards the inside at the edge points.
2. The lid according to claim 1, wherein the "spaced edge points" are located in a 180° angular area (30, 8) on the side of the gripping flap (3; 27; 36; 16).
3. The lid according to claim 1 or 2, wherein the edge points are disposed at a distance of at least 10° on both sides of the gripping flap.
4. The lid according to claim 1, 3 or 2, wherein the edge points with the film pieces (7a, 7b) are disposed in the range of from 20° to 60°, in particular in the range of about 30° or about 45°, on both sides of the gripping flap.
5. The lid according to claim 3 or 2, wherein the inclination of the fastening flange (13, 13a) is from 5° to 25°, in particular less than 15°, with respect to a horizontal (H) or is between 10° and 25° or between 10° and 15°.
6. The lid according to claim 1 or 2, wherein the film pieces (7a, 7b) are no more than two.
7. The lid according to any of the preceding claims, wherein the film pieces (7a, 7b) or flap pieces (16) are of a substantially rectangular design and are limited in the circumferential direction (γ).
8. The lid according to claim 1, wherein the film pieces or flap pieces (16) are arched at the ends (16a), each film piece or flap piece being in particular deformed in an arc-shaped fashion towards the outer side or upper side of the film (16a) - seen in the cross-section.
9. The lid according to claim 1, wherein a further film piece (7c) changes into the closure film vis-à-vis the gripping flap (27, 3) and/or this film piece radially extends the normal edge (15b) of the closure film.
10. The lid according to any of the preceding claims, wherein the film pieces or flap pieces are integrally (or continuously) connected with the closure film (1, 15).
11. The lid according to claim 1, wherein the closure film (15) comprises the outwards projecting gripping flap (3) at a circumferential point for initiating and implementing a peeling process, wherein the closure film for promoting the peeling process and for preventing the tearing of the film edge during the peeling process comprises the ears (16; 7a, 7b, 7a', 7a") projecting outwards beyond the fastening area (17) on selected edge areas as the flap pieces or film pieces.
12. The lid for a can according to claim 1, wherein the closure film (1, 15, 26) for promoting the peeling process and for preventing a tearing of the film edge (1a, 15b) during the peeling process (5, 28) comprises the film pieces (7a, 7b, 29a, 29b) which project outwards at a predetermined or given angular distance (8, 30, α), in particular at an angular distance of from 10° to 60°, on both sides of a central plane (6) of the gripping flap beyond a fastening area (4, 17) of the closure film on the fastening flange of the lid ring.
13. The lid for containers according to claim 1, wherein the closure film (35) comprises a gripping flap (36) projecting outwards in the diagonal direction (37) at an edge area for initiating and implementing the peeling process, wherein the closure film (35) - for promoting the peeling process and for preventing the tearing of the film edge during the peeling process (37) at the edges or sides (38, 39) starting from the corner area comprises film pieces (40, 41) projecting outwards beyond the fastening area of the closure film (35) on the lid ring - at a predetermined angular distance on both sides of a diagonally (37) oriented central line of the gripping flap, the angular distance being in particular of from 10° to 60°.
14. The lid according to claim 13, wherein one further film piece (42, 43) each is in each case provided in the corner area in each case at the end of each side (38, 39) of the closure film (35), which starts from the corner area with the gripping flap (36).
15. The lid according to any of the preceding claims, wherein the closure film has an ear-shaped film piece projecting beyond the fastening area of the film on each circumferential point where, according to experience, a deceleration of the peeling process or a (frequent) tearing of the film edge (1 a, 15a) occurs, in particular one integrally shaped film piece (7a, 7b) each protrudes.
16. The lid according to any of the preceding claims, wherein the flange (13, 13a) of the lid ring (10, 10a) extends from a core wall (20) to the edge (21 a) limiting the lid opening under an angle (ϕ) in a rising fashion.
17. The lid according to any of the preceding claims, wherein an angular distance of at least two protruding flap pieces or film pieces (7a, 7b) from the gripping flap (3) is greater than 3° or a radial extension of each of the protruding flap pieces or film pieces is greater than 0.1 mm, in particular less than 3 mm, or each flap piece or film piece extends by more than 1° as a radian measure.
18. A production of a seamable lid with lid ring, suitable for seaming onto an edge of a can body, wherein

    - an outer seaming edge (11, 19) is shaped onto the lid ring (10, 10a), which leads to a lid ring opening (15a) via a core wall (12, 20) and a fastening flange (13, 13a) that is preferably inclined vis-à-vis a horizontal plane;

    - a closure film (1, 15) is thermally sealed onto the fastening flange (13, 13a), the sealing extending along the entire opening (15a) of the lid ring (10, 10a) as a sealing strip (17);

    - the closure film (15, 1)

    -- comprises a gripping flap (3; 27; 36, 16) at one point of its edge (1a, 15b) for introducing tensile force for implementing a peeling process of the closure film, during which the sealing strip (17) is undone;

    -- the closure film comprises one outwards projecting ear-shaped flap piece (16) each or one protruding film piece (7a, 7b) each on at least two edge points spaced from the gripping flap (3) to one side each, which project beyond the sealing strip (17), wherein the edge points being selected in such a way that they promote a continuous peeling process and/or block or prevent a tearing of the closure film (15, 1) at the edge points with the flap pieces or film pieces (16; 7a, 7b) towards the inside
19. A working process for opening a lid with lid ring, suitable for seaming onto the edge of a can body or seamed onto it, wherein

    - the lid ring (10, 10a) comprises an outer seaming edge (11, 19), which leads to a lid ring opening (15a) via a core wall (12, 20) and a fastening flange (13, 13a); and
    a closure film (1, 15) is thermally sealed onto the fastening flange (13, 13a), said sealing extending along the entire lid ring opening (15a) as a sealing strip (17);

    - the closure film (15, 1) comprises a gripping flap (3; 27; 36, 16) at one point of its edge (1a, 15b), at which a tensile force is introduced for implementing a peeling process of the closure film and the sealing strip (17) is undone;

    - wherein a continuous peeling process takes place and/or an inwards directed tearing of the closure film (15, 1) at edge points with flap pieces or film pieces (16; 7a, 7b) during the peeling process is blocked or prevented;

    - for which purpose one outwards projecting ear-shaped flap piece (16) each or one protruding film piece (7a, 7b) each are provided at at least two edge points spaced from the gripping flap (3) to one side each, which project beyond the sealing strip (17).
20. The lid for containers according to claim 13, wherein - with a square lid opening - the angular distance on both sides of the diagonally oriented central line (37) is dimensioned in such a way that a circle or circular arc (K) with a center (M) on the other diagonal (37') is selected by the adjacent corner areas (42), said center being the point of intersection of both diagonals and the radius of the circle or circular arc being selected in such a way that it extends through the corner area with the gripping flap (36).
21. The lid for containers according to claim 13, wherein - with a rectangular lid opening - the angular distance on both sides of the diagonally oriented central line (37) is dimensioned in such a way that a circle or circular arc with a center on the other diagonal is selected by the adjacent corner area (42), said center being the point of intersection of both diagonals being vertically on each other and the radius of the circle or circular arc being selected in such a way that it extends through the corner area with the gripping flap (36).

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