EP2332849B1 - Cover ring having a slanted part and manufacturing process - Google Patents

Abstract

A container (20) has a closure (1) with a lever pull-ring opener. The lever ring has a peripheral flat strip (3a) running radially outwards to the lever ring rim (2). The rim and flat strip are linked by a groove (N1). The flat strip acts as a sealing zone and extends relative to the closure (1) plane at an angle alpha greater than zero.

Description

The invention is concerned with a particular design of a cover ring to optimize the force acting as buckling membrane acting closure layer, wherein the force is optimized in an adhesive strip, in particular a sealed seam, in order to increase the resilience of the seam by a pending internal pressure in a closed package. Other forces can be better absorbed.

In a claimed manufacturing process, the cover ring is first sealed with the sealing layer (claim 16), delivered in this prefabricated form and the filler filled the fuselage with the contents to then cover it together with the cover ring and the sealed closed position together and then the double fold edge train.

Starting from the usual design of a cover ring, cf. for example EP 408 268 A (CMB) or WO 1997/49510 A (Impress), there FIG. 4 , or GB 2 022 474 A (Swiss Aluminum), which has a Deckelbordierung outside and inside a horizontally oriented flat web, the hold (the adhesion) of a sealed on this flat bar membrane-like sealing film is to be improved. In the normal state, the cover ring is initially sealed inside with the sealing film. This creates a circumferential sealing seam of a certain width, which extends significantly on the flat web. Here, the holding forces are applied to the sealing layer, which is slightly bulged by a resulting internal pressure, which burdensome loads the seal at the point of adhesion from the inside, but preferably not so high or strong that a cohesive force limit is exceeded.

In the rest of the art inclined cover shelves have been known so far in ED lids, see. to DE 28 30 614 A (Officine Monfalconese) or WO 2000/21840 A (Brasilata metallica). EP 683 110 A (Carnaumetalbox) shows a generic cover ring and in Figure 6 and Figure 7 two variants with different inner shapes on the flat bar, a triangular shape ("curl") and a flat shape ("flattened to a fold"), see. there page 4, lines 27 to 41.

The invention is based on the technical problem of increasing a holding force on the flat web without having to make additional changes in the consistency or thickness or width of the sealed seam.

The invention proposes not to align the flat web substantially horizontally, but to extend in its extension inclined at an angle, being used as a reference plane that plane, which results in a aufgesiegelten closure position. As a result, the flat bar is angled upward, with a large Range of angles is initially possible, between above 10 ° and up to substantially 90 °, based on the mentioned level. In this case, the closure layer must already be sealed so that the position of the closure hypothetically serves as a measure of which plane is used as a comparison plane. This level can also be considered (claim 1) as a "horizontal" when hitting the lid ring on a surface.

Preferably, areas of the angular extent (the inclined extent) of the flat web above 10 °, in the range between 25 ° and 35 ° and between 40 ° and 60 ° or substantially perpendicular or between 80 ° and 90 ° (claim 3).

In inclination of the flat web results in a wedge-shaped groove between a peripheral wall, which leads as a core wall for Randbordierung the cover ring, and the inclined flat web. This wedge-shaped design has two non-parallel walls and a rounded bottom portion which rotates as a groove and the lowest point of the cover ring - viewed in the axial direction - forms (claim 7).

The Randbordierung the cover ring is a circumferentially extending, outwardly and downwardly arching structure that is suitable for Anfalzen the cover ring to a hull hook of a hull. The fold can be a double fold application.

Most of the cover ring is first sealed with the sealing layer (claim 16), delivered in this prefabricated form and filled at the bottler of the hull with the contents to then cover it together with the cover ring and the sealed closed position together and then form the double fold edge.

At a suitable location on the edge of the closure layer, at least one or more tabs may be provided, which serve for peeling and the sealing seam begin to split at this point. The entire sealed seam is circumferentially continuously separated and opens the interior to give access to the contents.

On the inside of the inclined aligned flat web a Randeinrollung is provided. It forms a deflection point for the closure layer, which is aligned from this Inneneinrollung in a flat position (without internal pressure load), while the edge of this closure position according to the orientation of the flat web inclined and extending abschälbar thereon over the sealed seam (the adhesive strip) extends. By deflecting pressure forces within the sealed container, which act on the closure position, at least partially converted into such forces, which form in the direction of extension of the sealed seam as tensile forces. In this case, a much higher force can be applied in this direction, after the entire width of the sealed seam resists this tensile force. Pure traction forces formed perpendicular to the sealing seam, which are present for example when peeling or opening the closure, can be reduced for the closed state become. This can delay the time at which the cohesive action of the sealing seam breaks, the so-called cohesive failure, which can be shifted to higher levels instead of 25 N, up to 40 N. At substantially 90 °, even 50 N become ruptured reached.

Metallic films can be used as sealing layers, as well as plastic films which are sealed in the edge region. Also possible are composite films (multiple layers or layers) or metallized films which are to be sealed (claims 12 to 15).

As a sealing surface, an extra applied seal strip on the flat bar offers when a metallic closure layer is used as a film (claim 13). The sealed seam preferably has a substantial width, more than half, preferably substantially the entire extent of the flat web (claim 11).

If a flat web aligned substantially perpendicular (to the horizontal plane of the closure layer) is used, the inner edge curl can even reach axially beyond the upper side of the edge bordering for the folded seam.

Figur 1

veranschaulicht einen Ausschnitt aus einem Deckelring, welcher in einem axialen Schnitt gezeigt ist.

Figur 2

veranschaulicht eine alternative Ausführungsform mit einem anders geneigten Flachsteg.

Figur 3

veranschaulicht eine dritte Ausführungsform mit einem nochmals anders, hier nochmals flacher geneigt verlaufenden Flachsteg.

Figur 4a, Figur 4b

veranschaulichen Unterschiede zwischen Zugkräften und Scherkräften bei einer Druckbelastung aus dem Innenraum auf die Innenseite der Verschlusslage 1, wobei die Druckbelastung mit F_i bezeichnet ist.

Exemplary embodiments explain and supplement the invention.

FIG. 1

illustrates a section of a cover ring, which is shown in an axial section.

FIG. 2

illustrates an alternative embodiment with a different inclined flat web.

FIG. 3

illustrates a third embodiment with a yet different, here again flatter inclined flat web.

Figure 4a, Figure 4b

illustrate differences between tensile forces and shear forces in a pressure load from the interior to the inside of the closure layer 1, wherein the pressure load is denoted by F _i .

In FIG. 1 a section of a cover ring is shown, which is closed in the closed state with a film 1, which can take many alternative designs, so may be made of plastic or metal or a composite of such layers.

In the edge region of the lid closed with foil, an edge trim 2 is provided, which has a substantially U-shaped form. A different U-shape is found in a groove N ₁ , which is formed between the inner wall of Randbordierung as a core wall and an upright erected flat web 3a. On the axial outer side of the flat web, the edge region of the closure layer 1 is closed with a sealing layer not separately shown here. For the training of the seal situation becomes exemplary on the FIG. 4b which shows this sealing layer 30 as adhesion layer, for example, adhesive or other suitable, adhesive and food-compatible material.

Symbolically, the hull is shown as a trough 20, which has a sloping protruding edge 21 which is inverted when closing the Deckelbordierung 2, to be subsequently transferred with a closing machine and a seaming roller in a double seam and to close the trunk 20. Vertically rising, the container wall 22 of the fuselage is shown, which defines the height of the receiving volume of the fuselage 20.

On the inside of the flat web 3a, a Inneneinrollung 4 is provided, the exact design of the FIGS. 4a, 4b can be removed. It avoids cutting dangers and ensures a deflection u of the closure layer 1, between a sealing portion in its edge region 1 b and a plan section, which freely over the entire interior, within the Randbordierung 4 passes over and this closes.

The inclination of the flat web 3a is about 90 ° as angle α1 in the embodiment of FIG. 1 specified. The alignment of the flat web thus takes place substantially perpendicular to the plane which is predetermined by the inner region of the closure layer 1. The Innenbordierung 4 protrudes in this example axially over the top of the outside Randbordierung 2 over, so that the closure layer 1 protrudes upward on this outside.

An alternative inclination α2 is in FIG. 2 shown for the flat bar 3b. This angle is in the range between 40 ° and 60 °, oriented at the described plane of the closure layer as a membrane 1, which is shown here with a thickness d as very thin. Compared with the thickness of this closure layer 1, the sheet metal in the cover ring is stronger, so that the molded-in geometries are maintained in normal use, with the exception of the forming of the lid edge 2 in the formation of the seam with the fuselage hook 21 of the fuselage 20th

In the FIG. 2 shown weaker inclination α2 compared to FIG. 1 relative to the flat web 3b brings a different cross-sectional shape of the substantially wedge-shaped circumferential groove N ₂ , which has a rounded groove bottom. This groove base forms the lowest point of the cover ring, which may be round as such, oval, long oval or rectangular, with slightly rounded inner corners, while allowing the formation of an internal curl 4 also in these inner corners.

Another design shows the FIG. 3 in which a flatter orientation α3 of the flat web 3c in the range between 25 ° and 35 ° is selected. All other provisos of the preceding description of FIG. 2 are fulfilled as well. Again, the Inneneinrollung 4 serves as a deflection point for the membrane in the region between the circumferentially extending seal point 30,1b and the inner surface to cover the opening within the Inneneinrollung. 4

The angle α3 can be further reduced in other examples, which are not shown separately, to about 10 °, but should be above 0 ° and thus form an oblique (inclined) training relative to the described plane of the closure membrane 1.

Due to the different orientation of the flat web, which is not horizontally aligned due to its name, but is flat on a significant width to produce a flat sealed seam on which the membrane can be sufficiently well and tightly secured, there are different designs for the Shape of the circumferential groove N ₂ , N ₃ , with a respective flatter inwardly extending wall, but substantially constant slope of the core wall for Deckelbordierung second

Due to the inclination of the flat web, shown by way of example by examples α ₁ , α ₂ and α ₃ , a system according to the FIG. 4b receive. An internal pressure on the freely bearing inner surface of the membrane 1 is deflected by the Innenbordierung 4 and provides a tensile force in the sealing area 30. The entire width of the sealed seam 30, here in the cross section of FIG. 4b shown, this tensile force z can resist, and better resist, than if a horizontal orientation of the flat bar after FIG. 4a is selected. Here, the compressive force F _i acts on the membrane 1 so that a notch effect x at the point 31 of the sealed seam 30 is formed by a vertical tensile force X, which due to the pending substantially perpendicular to the extension of the sealing strip 30 forces easier to loss of cohesive effect and that leads to a cohesive failure, than that at FIG. 4b was described.

The stronger the inclination of the flat web 3, the stronger the conversion of the forces perpendicular to the sealing seam 30 FIG. 4a into those that are to be described as "shearing forces". It Peelkräfte (vertical tensile forces) are converted into such parallel to 30 extending forces, which after FIG. 4b can be better absorbed, of the entire width of the sealing strip 30, as the notch effecting tensile forces X after FIG. 4a ,

Claims (16)

1. A lid ring for seaming to a body (20) and including a closure layer (1) peripherally sealed thereto which bridges an interior space of the lid ring and, in a seamed state, seals the body (20), wherein

   (i) the lid ring comprises a circumferential flat web (3a, 3b, 3c) transitioning radially outwardly into a circumferential edge rim (2) of the lid ring, wherein a circumferential groove (N₁, N₂, N₃) extends between the edge rim and the flat web,
   characterized in that

   (ii) the flat web is upwards inclined from a horizontal plane and is provided with an inner curl (4) at its radially inner end so that a closure layer (1) sealed (30) onto the flat web is deflected at the inner curl (4) and, in the case of a pressure force (F_i) perpendicular to the plane of extension of the closure layer (1), a substantial force component (z) is deflected via the inner curl (4) and is introduced into the sealed seam (30) such that it extends in the direction of extension of the sealed seam and a cohesion effect of the sealed seam (30) is transferred to ranges greater than 25N, up to 40N.
2. The lid ring according to claim 1, wherein the flat web serves the purpose of sealing the edge of the closure layer (1) thereto and extends in an angle (α₃) of between substantially 25° and 35° to a horizontal plane.
3. The lid ring according to claim 1, wherein the angle (α₁, α₂, α₃) is between substantially 10° and substantially 90°, especially between substantially 40° and 60°, or between substantially 25° and 35°, or between substantially 80° and 90°.
4. The lid ring according to claim 1, wherein the closure layer is sealed onto the flat web (3a, 3b, 3c) via an edge of the closure layer (1) and via a circumferential sealing strip (30).
5. The lid ring according to claim 1, wherein the sealed seam (30) is an adhesive strip.
6. The lid ring according to claim 3, wherein the cohesion effect, at substantially 90°, is up to 50N.
7. The lid ring according to claim 1, wherein the circumferential groove (N₁, N₂, N₃) is wedge-shaped, and two non-parallel walls of the wedge shape are formed by the inclined flat web (3c) and a circumferential wall which, as a core wall, leads to the edge rim (2), and a rounded bottom area is provided which, as a component of the circumferential groove, forms the deepest point of the lid ring when viewed in an axial direction.
8. The lid ring according to claim 7, wherein the edge rim (2) of the lid ring is a structure arching outwards and downwards and suitable for seaming to a body hook (21) of a container body.
9. The lid ring according to any one of preceding claims 1 to 6, wherein the groove (N₁, N₂, N₃) is of a wedge-shaped configuration including a rounded bottom and is formed between a core wall towards the lid rim (2) and the flat web (3a, 3b, 3c) of inclined orientation.
10. The lid ring according to any one of the preceding claims, wherein the closure layer extends across the inner curl (4) and is thus deflected (u) so that an edge strip (1b) is formed which extends in a non-zero angle to the plane of the closure layer (1) in the interior area of the lid ring.
11. The lid ring according to any one of the preceding claims, wherein the sealed seam (30), as a circumferential strip, has a substantial width on the extension of the flat web (3; 3a, 3b, 3c), which width is more than half of a width of the flat web.
12. The lid ring according to any one of the preceding claims, wherein the closure layer is a foil consisting of a metal foil or a composite foil as a layer composite.
13. The lid ring according to any one of claims 1 to 11, wherein the closure layer (1) is a metal foil having a separately applied sealing strip (30).
14. The lid ring according to any one of claims 1 to 11, wherein the closure layer (1) is a composite foil consisting of a plurality of layers or sheets.
15. The lid ring according to any one of claims 1 to 11, wherein the closure layer is a metallized foil.
16. A method for manufacturing a lid consisting of a lid ring and a closure layer (1) sealed thereto, wherein the lid ring is sealed with a closure foil and is delivered in this prefabricated form for covering, upon filling, a body (20) filled with filling material and for forming a double seam at the lid edge, wherein the lid ring has a form according to any one of the preceding claims.

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