EP1658226B1 - Cover ring having a slanted flat strip - 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 special design of a lid to optimize the force acting as buckling membrane acting closure layer, wherein the force is optimized in an adhesive strip (as a seal) to increase the resilience of the seam by a pending internal pressure in a closed package. Other forces can be better absorbed.

Starting from the usual design of a cover ring, cf. for example EP 408 268 A1 (CMB) or WO 97/49510 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 A1 (Officine Monfalconese) or WO 00/21840 A1 (Brasilata metallica).

A generic cover ring, which works with an annular component on the inner edge, allows the bulging of the membrane from the inside to the outside, see. WO 20051005277 A1 (Crown Packaging). Preferred angles of inclination of the flat web (called there 3) are between 10 ° and 20 °. This document is not pre-published and constitutes a prior art to be considered only in the context of novelty. Different from that EP 683 110 A1 (Carnaudmetalbox), which also discloses inclined flat webs on a cover ring, cf. There, however, Figures 6 and 7. The membrane has a completely different shape, has a step and fed with the stored in this stage lid material bulging of the membrane at pressure. The proposed angle of inclination of the flat web is about 30 ° (relative to the horizontal). The other embodiments of the cited document deal with a sealing of the lid edge on an upper body portion, which preferably extends radially outwardly and downwardly angled. There are, however, too Examples, there FIG. 1, 2 disclosed in which this bend of the upper edge portion of the container wall is inclined inwardly.

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 allow it to extend in its extension inclined at an angle, being used as a reference plane that plane, which results in a sealed-sealing position. As a result, the flat web is angled upward, wherein a below-mentioned range of angles is claimed, based on the mentioned level. The closure is already sealed. This plane can also be considered a "horizontal" when the lid ring is placed on a surface. Is the closed position sealed (claim 9), results in a foldable lid.

Areas of the angular extent (the inclined extent) of the flat web are between 25 ° and 35 ° or substantially perpendicular or between 80 ° and 90 °.

In inclination of the flat web results in a wedge-shaped groove between a peripheral wall, which leads as a core wall for Behälterbordierung, 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 deepest point of the cover ring - viewed in the axial direction - forms.

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

Usually, the cover ring is first sealed with the sealing layer, delivered in this prefabricated form and filled at the filler of the fuselage with the contents to then cover it with the cover ring and the sealing 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.

A Randeinrollung is provided on the inside of the inclined flat web aligned. It forms a deflection point for the closure layer, which is oriented 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 seal seam (the adhesive strip or sealing strip) extends.

By deflecting pressure forces within the sealed container, which act on the closure position, at least partially implemented in such forces, which form in the direction of extension of the sealed seam (the sealing strip) as tensile forces. In this case, a much higher force can be applied in this direction, after the entire width of the sealing strip resists this tensile force. Pure traction forces formed perpendicular to the sealing strip, which are present for example when peeling or opening the closure, can be reduced for the closed state. This can delay the time at which the cohesive effect of the sealing strip breaks, the so-called cohesive failure, which can be shifted to higher regions instead of 25 N, up to 40 N. At substantially 90 ° (claim 3) even 50 N reached until break.

Metallic films can be used as the closure layer, 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.

The sealing surface is an extra applied sealing strip on the flat web, if a metallic sealing layer is used as a foil. The sealing strip has a substantial width, more than half, preferably substantially the entire extension of the flat web.

If a flat web aligned substantially perpendicular to the horizontal plane of the closure layer is used, the inner edge curl can extend axially beyond the upper side of the edge bordering for the folded seam (claim 4).

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, dessen Neigungswinkel nicht beansprucht ist.

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.

Execution examples 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, the angle of inclination is not claimed.

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-shaped shape is found in a groove N1, which is formed between the inner wall of Randbordierung as a core wall and an upright 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 then transferred with a capping machine and a folding roller in a double seam and to close the trunk 20. Vertical is the towering Container wall 22 of the fuselage, which defines the height of the receiving volume of the hull 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 (unclaimed) range between 40 ° and 60 °, oriented at the described plane of the membrane 1, which is shown here with the 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 N2 having 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 Wherein a flatter alignment 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. Here, too, the Inneneinrollung 4 serves as a deflection point for the membrane in the area between the circumferentially extending seal 30,1b and the inner surface 1 for covering the opening within the Inneneinrollung. 4

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 sealing strip on which the membrane can be sufficiently well and tightly secured, there are different designs for the Form of the circumferential groove N2, N3, 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 α1 and a3, 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 region of the sealing strip 30. The entire width of the sealing strip 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 _j acts on the membrane 1 so that a notch effect x at the point 31 of the sealing strip 30 by a vertical tensile force X arises, which by the substantially perpendicular to the extension of the sealing strip 30 pending 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 transformation of the forces perpendicular to the sealing strip 30 FIG. 4a into those that are to be described as "shearing forces". It Peelkräfte (vertical tensile forces) are implemented in such parallel to the sealing strip 30 extending forces, which 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 (6)

1. Lid comprising lid ring and closure layer (1) for folding onto a body (20) and with an edge-side connection of a sealed-on closure layer (1) which bridges an interior of the lid ring - typical of a lid ring - and - in a folded-on state on the body (20) - closes the latter, wherein

   (i) the lid ring has an annular flat bar (3a, 3c) which - along its entire periphery - transfers radially outwards into an edge border (2) of the lid ring, wherein an annular groove (N1, N2, N3) runs between the edge border and the flat bar and the flat bar radially inwards has an edge roll (4);

   (ii) the flat bar is suitable for sealing-on of the edge of the closure layer and runs at an angle (α3, α1) which is different from zero with respect to the plane of the sealed-on closure layer (1), wherein the angle lies between essentially 25° and 35° or between essentially 80° and 90° and the edge roll (4) forms a deflecting point for the closure layer (1) which from this edge roll is aligned in a flat position (without internal pressure stress);

   (iii) an extensively running sealing strip (30) is provided on the flat bar (3a, 3c), for connecting the closure layer as a sealing-on of the edge of the closure layer, wherein the extensively running sealing strip (30) has a substantial width on the extension of the flat bar (3), which width is more than half of the width of the flat bar.
2. Lid according to claim 1, wherein the groove (N1, N2, N3) has a wedge-shaped design with a rounded base and is formed between a core wall to the lid border (2) and the flat bar (3a, 3c) which is aligned at an angle.
3. Lid according to claim 1 or 2, wherein the angle which is different from zero runs essentially vertically to the extension of the plane of the closure layer (1) to be attached.
4. Lid according to claim 1, wherein a inner roll is provided which projects axially beyond an upper side of the edge border (2) when the flat bar (3a) is aligned to project steeply.
5. Lid according to one of the previous claims, wherein the closure layer is formed as a film or membrane, in particular made from plastic or metal sheet or metal foil or composite film as a layer composite.
6. Lid according to one of the previous claims, wherein the closure layer is attached and runs over the inner roll (4) and is thus deflected (u) so that an edge strip (1 b) is formed which runs at the angle which is different from zero with respect to the plane of the closure layer (1) in the inner region of the lid ring.

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