The invention relates to the lid of a container, in particular a beverage can comprising at least one pour opening penetrating the lid panel which is reclosable by at least one closure member, where the at least one closure member can be moved by an actuating element from a closed position, in which at least one pouring opening is closed, to an open position, in which the pour opening is at least partially exposed.
Containers of the type described above are produced, for example, as reclosable beverage cans. In a particularly advantageous embodiment of such cans, a pour opening is provided in the lid panel that is like the remainder of the can made of metal, typically made of aluminum or tinplate. This opening is closed by a closure member. This closure member is moved by an actuating element, for example, by a flap or a (rotary) slider from a closed position to an open position, whereby the pour opening is exposed for emptying the can, and can again be closed after the initial opening.
An essential requirement for reclosable beverage cans is their tightness even after repeated opening and closing of the pour opening. A closure member which is made of plastic and has an annular circumferential gas- and liquid-tight seal can be gathered, for example, from AT 507 950 A1 and AT 505 756 B1 of the applicant. However, such a closure member is due to its two-component structure (2 different plastics—a load-bearing hard component and a soft sealing component united in a single injection molded member) is expensive to manufacture. In addition, this technology allows only limited design options for the closure member because particular requirements regarding the plastic injection molding process need to be complied with in terms of parting planes, initial cast positions, wall thickness conditions etc. It would be more cost-effective to realize the sealing function not by a two-component structure, but by a more readily available and therefore more economical planar sealing component from industrially more established standard production processes or semi-finished products.
WO 2011/124552 A1 discloses a container closure device in which a seal is disposed between a lid and a closure member. The contact of the closure member and the seal is there planar. The drawback there is that high contact pressures are needed to securely seal the container.
It is therefore an object of the invention to provide a lid for a reclosable container which ensures gas-and liquid-tight closure of the pour opening also after repeated reclosing and at prolonged storage of the container and which at the same time is cheap and easy to produce.
This object is satisfied by a lid of the aforementioned type in that at least one planar seal element is arranged between the lid panel and the closure member and at least one sealing area is provided at the closure member which during closure of the pour opening coacts with the at least one planar seal element. Planar seal elements, so-called liners, are known, for example, from closure caps of bottles. These are substantially flexible films preventing liquid and/or gas, in particular carbon dioxide, from escaping from the bottle. The at least one sealing area is according to the invention formed as a seal ridge. The pressure during closure exerted by the sealing area upon the planer seal element is increased over prior art due to the reduced contact surface, so that the seal ridge pushes into the planar seal element, thereby achieving an improved sealing effect with less force.
In the present invention, preferably at least one sealing area is provided at the closure member, in particular a seal ridge, which is in the closed position of the closure member pressed into the planar seal element and in this manner seals the pour opening and prevents the contents of the beverage can from leaking out.
In a particularly preferred embodiment of the invention, the at least one closure member and the planar seal element are disposed at the underside of the lid panel, where the at least one closure member during closure of the pour opening coacts with the planar seal element, and particularly preferably, the at least one sealing area is arranged at the surface of the closure member facing the underside of the lid panel.
In a further preferred embodiment of the invention, the closure member is pivotable from the open position to the closed position and from the closed position to the open position. Due to the pivotal motion, the at least one sealing area, in particular at least one seal ridge, is pressed substantially normally against the planar seal element when the closure member is moved to the closed position so that precisely defined sealing of the pour opening is obtained.
The at least one sealing area in a particularly preferred embodiment of the invention fully encloses the at least one pour opening when the closure member is in the closed position in order to achieve sufficient tightness of the re-closed beverage can, also when it is filled with carbonated beverages. In this, the sealing area runs at a distance from the edges of the pour opening, which, for example, has an elliptical shape. In a preferred embodiment, the sealing area, in particular a seal ridge, can be at an even (substantially uniform) distance from the edge of the pour opening, possibly also respectively with further openings. Since the at least one sealing area is pressed against the surface of the planar seal element when the closure member is in the closed position, the seal element must be made of at least partially elastic material. More preferably it is provided that the planar seal element is embodied as a film, in particular as a foam sheet or a rubber sheet.
In a particularly simple variant of the invention, the planar seal element covers the underside of the lid in its entirety, where only the area of the pour opening and possibly the openings for the arrangement of an actuating element remains uncovered.
Alternatively, the planar film is in a further embodiment of the invention smaller than the area of the lid and thereby covers the latter's underside only partially, where, however, the pour opening is again surrounded entirely by the planar seal element.
In the manufacture of the lid according to the invention, it is particularly preferably to provide that the planar seal element is attached to the underside of the lid of the container by inserting, bonding, printing, or casting. Furthermore, the planar seal element can be applied to the underside of the lid by compression molding, where the material of the planar seal element preferably comprises a thermoplastic elastomer. The thickness of the planar seal element can be in the range of 0.1 mm to 2 mm, preferably 0.2 mm to 1 mm.
Though the planar seal element in a further variant of the invention covers the lid panel practically in its entirety, it is not fixed over the entire surface to the lid, but only in small area spaced apart from each other.
Particularly cost-effective manufacture of the lid according to the invention is given when the closure device and/or the actuating element are made of plastic, where production can be achieved in large numbers in an easy and cost-effective manner by injection molding.
In a further development of the invention, the lid panel can comprise a ventilation opening and the closure member can be provided with a passage opening aligned with the ventilation opening, where the ventilation opening and/or the passage opening can be closed and opened with a peg in a fluid-tight manner.
In a preferred optional embodiment, the peg is tapered towards the ventilation opening. The ventilation opening or the passage opening, respectively, can therewith be closed by pressing in the peg.
The peg can be part of the actuating element or be provided separately, for example, as part of a pivotable flap.
The passage opening can comprise a seal ring, in particular a tube portion or an O-ring, for closing the ventilation opening and/or the passage opening with the peg in a fluid-tight manner.
Alternatively or in addition, the peg can on its outer side comprise a seal ring for fluid-tight closure of the ventilation opening and/or the passage opening with the peg, where the seal ring preferably comprises a tube portion or an O-ring.
According to a development, the passage opening can comprise a holding region, in particular a rivet button, for preventing the seal ring from slipping out, and/or the peg can comprise a holding region, in particular a rivet button, for preventing the seal ring from slipping off.
The lid according to the invention or one of its developments can be further developed in that the lid panel can further comprise an actuating element opening, where the planar seal element is preferably integrally formed, and where the planar seal element can enclose both the pour opening as well as the actuating element opening, and the pour opening as well as the actuating element opening can be uncovered, where in the presence of a ventilation opening, the ventilation opening can also be uncovered.
According to another development, the seal ridge can be formed as part of the closure member (120), the seal ridge can in particular be formed integrally with the closure member.
The seal ridge can have the cross-section of a V-shape, a V-shape with a flattened tip, a V-shape with a rounded tip, a rounded shape, in particular a semi-circular shape or a rectangular shape. These shapes are advantageous in that the seal ridge presses well into the planar seal element when the closure member is moved to the closed position, thereby achieving an effective seal, which is particularly relevant, for example, for carbonated beverages.
The size of the seal ridge is preferably such that a maximum height of the seal ridge is in the range of 0.2 mm to 1 mm and/or a maximum width of the seal ridge is in the range of 0.3 mm to 1 mm and/or in the case of a V-shaped seal ridge, the V-shape has an angle of 30° to 120° and/or in the case of a V-shape with a flattened tip, the width of the flat area is in the range of 0.05 mm to 0.2 mm and/or in the case of a V-shape with a rounded tip, the curvature radius of the rounded tip is in the range of 0.05 mm to 0.3 mm, and/or where the seal ridge is in the closed position pressed into the planar seal element by 0.1 mm to 1 mm.
If the lid panel comprises an actuating element opening, a seal ridge can each be provided for the pour opening, as well as for the actuating element opening, which encloses and seals the respective opening in the closed position. Alternatively, both openings can be enclosed by one seal ridge.
According to another further development, the planar seal element can on a peripheral edge of the planar seal element additionally comprise a thickening which is formed integrally with the planar seal element and with which an edge region of the lid is sealed relative to the container. The thickness/height of the planar seal element can be in the range of 0.1 mm to 2 mm, where the thickening has a height in the range of a factor by 1.1 to 5 of the thickness of the flat area, the thickening is therefore elevated by 10% to 400%.
The invention is below explained in more detail by way of non-restricting embodiments with accompanying figures.
a shows a sectional view of the lid of
b shows a sectional view of the lid of
a,b,c show a schematic representation of a peg according to the invention for tight closure of a ventilation opening, and
a,b show a sealed opening of the ventilation opening for receiving a peg.
a,b,c,d illustrate various embodiments of the seal ridge according to the invention.
a,b illustrate a planar seal element with a bead at its edge.
In
If the pour opening 103 is now by pivoting the closure member 120 exposed to the interior of the container, as shown in
The embodiment of the invention shown in
In the embodiment of the lid 100 according to the invention shown in
The size of the seal ridge is in these embodiments such that a maximum height A of the seal ridge is in the range of 0.2 mm to 1 mm and/or a maximum width B of the seal ridge is in the range of 0.3 mm to 1 mm and/or in the case of a V-shaped seal ridge, the V-shape has an angle a of 30° to 120° and/or in the case of a V-shape with a flattened tip, the width C of the flat area is in the range of 0.05 mm to 0.2 mm and/or in the case of a V-shape with a rounded tip, the curvature radius R of the rounded tip is in the range of 0.05 mm to 0.3 mm. In this manner, the seal ridge is in the closed position of the closure member pressed into the planar seal element by 0.1 mm to 1 mm.
It is understood that the present invention is not restricted to the above embodiments. In particular, the lid can be provided with further openings, for example, ventilation openings that are likewise sealed against leakage of the contents from the beverage can by coaction of the seal ridge of the closure member with the planar seal element. It can also be provided that the pour opening and/or ventilation opening is not sealed by a single seal ridge, but by several seal ridges running parallel to each other. Finally, the closure member illustrated in the figures is to be viewed as being non-restrictive, it does not necessarily need to be pivotable, it can also be movable substantially parallel to the lid panel, for example, along an axis, in order to be brought from a closed position to an open position and again returned. The sealing area can be realized in different ways at the closure member, it can in particular be formed as an elevated area with a variety of cross-sectional geometries.
Number | Date | Country | Kind |
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12185214.9 | Sep 2012 | EP | regional |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2013/069012 | 9/13/2013 | WO | 00 |