WO2018172967A1

WO2018172967A1 - Reclosable can end for a beverage can

Info

Publication number: WO2018172967A1
Application number: PCT/IB2018/051922
Authority: WO
Inventors: Erwin Vanderstraeten
Original assignee: E.V.D.S. Bvba
Priority date: 2017-03-22
Filing date: 2018-03-22
Publication date: 2018-09-27
Also published as: BE1024800A1; BE1024800B1

Abstract

The invention relates to a reclosable (beverage) can end comprising a, preferably metal, can end with a tearable groove and a first and second fixation element, in which at the first fixation element, a pull tab has been attached, the pull tab has an operating end that can be lifted away manually from the can end and has an operative end situated opposed to the operating end and positioned in the area of the tearable groove for, when lifting the operative end, exerting a force onto the can end and opening the tearable groove thereby providing a pouring or beverage aperture and a torn out can end part, characterized in that the second fixation element at the top of the can end can receive the operating end of the pull tab and receives a spring element from the bottom of the can end, in which the can end is reclosable by repositioning the torn out can end part in said aperture by means of the spring element and take up of the pull tab end by means of the second fixation element.

Description

RECLOSABLE CAN END FOR A BEVERAGE CAN

TECHNICAL FIELD The present invention relates to a can end for a beverage container, preferably a beverage can, such as an aluminium, steel or PET can. The can end is reclosable in a simple way.

BACKGROUND Beverage cans are generally known. These beverage containers with metal can end have the disadvantage that they can no longer be closed after opening . With an opened beverage container, the disadvantage is that insects come towards the drink and can fall into the container unnoticed . This can have adverse consequences for the consumer. Consumption in a vehicle, such as an airplane in a turbulence or when walking through a train, has the disadvantage that the drink can unwantedly leave the opened container. Furthermore, it can be desired that the drink is consumed in portions, for example at a workplace, in case of carbonated drinks, or for children. To avoid excessive alcohol consumption, it is desirable that a portionable packaging becomes available to temper or spread the consumption of for example alcoholic drinks, such as cocktails in a can or energy drinks. Some users prefer to drink directly from the can, others want to transfer the drink into a container, such as a glass.

Numerous reclosable beverage cans and can ends have been developed, but only a few found their way to the market. Hereby, we think of the XO of Xolution GmbH based on an injection moulded plastic component and the "Ball Resealable End" or BRE of Ball Corp. These proposals have the disadvantage that they are based on fairly complex mechanisms. This means that a consumer is not familiar with the opening and closing mechanisms and new manipulations need to be taught. The proposed solutions introduce new materials, such as plastic can ends. This has the advantage that another type of material is introduced . This is disadvantageous for recycling. The proposed solutions introduce quite a lot of extra material. Extra material often means extra thickness and a corresponding reduction of the production speed on an assembly line. Moreover, this goes against the trend in the industry, whereby can producers look for ways to reduce the weight so that the beverage container is less environmentally harmful. This is an important restraint for proposals working with material addition. Mechanisms that are based on an aperture with closing elements, such as a cap, are not hermetically sealed. There is a problem with gas-tightness.

US 7,823,740 describes a closing mechanism based on a rotational movement and additional material above and below the beverage can end. This closure system goes through the can end which is disadvantageous for the safety. Leaks can occur. This system is not odour-proof and therefore hardly suitable for energy drinks such as RedBull or Monster. EP 2 032 452 describes a reclosable can based on a membrane that hangs below the closure of the beverage opening and is attached to the fixation point below the pressure point of the pull tab. This curved way of suspension is sensitive to spooning up beverage and consequently to sticking and adhesion of to the membrane. In addition, the fixation of the membrane to the can end is based on a fixation element that goes through the can end . The integrity of the can end was therefore abandoned . This increases the chance of leaks. The embodiment of Figure 5a is based on two rivets. The groove cannot be torn open but needs to be pushed open. The pull tab is attached to the cap top and cannot move in independent manner.

NL 1010231 describes a proposal for a closure based on a rotational movement of the pull tab and locking of the pull tab in the inner edge of the can end for closing. There is a risk that the end of the pull tab that is pushed into the pouring aperture is contaminated. The can opening is shut off from the outside. Additional disadvantages are the risk of bursting when the pressure in the can increases, as well as in case of an external pressure onto the central part. The thickness of the closing mechanism is also disadvantageous. Upon closing, the pull tab should be turned 180 degrees and should be positioned accurately by the consumer.

In EP 2 611 705, a mechanism for reclosing a beverage can end is proposed that is based on a combination of elements, i.e. a cap top, a shut-off valve and an elastic spring element. The elastic element is folded double in order to be able to exert a resilient effect on the cap top. This requires space. Venting is based on a reclosable opening in the can end, namely in the shut-off valve part.

Also in WO 2017/032752, use is made of a cap top, and a separate shut-off valve and an elastic spring element, for reclosing a beverage can end . The venting mechanism is based on a cut in plate-like elements. Making a cut requires a separate production step.

There is a need for additional improvements and above all simplification, without loss of reliability with respect to the opening/venting and closing mechanism. It is an object of the present invention to solve at least one of the disadva ntages mentioned above. The present invention aims to offer a simple solution which is as close as possible to the habits and to the visual perception of a user and offers a producer the advantage of having an economically feasible alternative, for instance in the field of production speed, number of parts and material choices. SUMMARY OF THE INVENTION

This aim is achieved with a can end according to claim 1, a spring element according to claim 8, a reclosable can end according to claim 15 or a container according to claim 16; most preferably as shown in Figures 1-40. A reclosable metal can end according to the invention is characterized by the provision of a spring element underneath a tearable contour outline for reclosing the aperture that is made after tearing out the contour by operating a pull tab that is provided on the can end. The opening of the can end can thus be reclosed in an advantageous way. In an additional aspect, the invention provides in a method for producing a reclosable container according to an embodiment of the invention. The invention also provides a method for using a container according to an embodiment of the invention. Further improvements have been elaborated in the dependent claims.

DESCRIPTION OF THE FIGURES

Figure 1 shows a three-dimensional Figure of a preferred embodiment of a beverage can end with spring element according to the invention. Figure 2 shows a top view of a beverage can end according to an embodiment of the invention. A cross-section is shown in Figure 3. Figure 4 illustrates a stack of can ends such as those depicted in Figure 3. Figure 5 shows the parts for a beverage can end as shown in Figure 1, this time with view on the bottom side. Figure 6 shows a three-dimensional view of a beverage can end that has slightly been opened and is therefore vented. This is the venting step. A detailed view is shown on the right side thereof. Figure 7 shows the embodiment applied to a beverage can. Figure 8 is a schematic representation of the venting mechanism when opening a beverage can equipped with a spring element according to the invention. Figure 9 shows a three- dimensional representation of a fully opened beverage can with spring element according to the invention. The corresponding cross-section is shown in Figure 10. Figure 11 shows a top view of a beverage can end without pull tab. Figure 12 shows a three-dimensional representation of a seamed can end, in a drinking position using the spring mechanism based on a spring element according to the invention. The corresponding cross-section is shown in Figure 13. Figure 14 shows a three-dimensional representation of a can end and spring element, with a bottom view, prior to assembly. This figure illustrates the fixation plane, and fixation is preferably by gluing. Figure 15 shows a detailed representation of a sealing mechanism that can be applied to a beverage can end according to the invention. Figure 16 shows schematic representations of alternative spring elements according to the invention. Figure 17 is a three-dimensional representation of the spring element shown in Figure 16 B. Figure 18 illustrates the pouring position, whereby the can is opened and the pull tab is held. Figure 19 shows an asymmetric embodiment of a can end according to an embodiment of the invention. Figure 20 shows a narrow embodiment of a can end according to an embodiment of the invention. Figure 21 shows an embodiment of a can end according to an embodiment of the invention similar to a can end that is known from the state of the art. Figure 22 shows a three-dimensional representation of a seamed can end in bottled condition under pressure provided with a spring element according to an embodiment of the invention. Due to the circumstances, the spring folds inwardly. Figure 23 shows a cross-section of a seamed can end in bottled cond ition under pressure with folded spring element. Figure 24 shows a schematic representation of an alternative spring element according to an embodiment of the invention, and a cross-section through the line A-A. Figure 25 shows a schematic representation of a drawing bench arrangement for measurements of the force required for opening of can ends with and without spring element. Figure 26 shows a schematic representation of a test arrangement, in particular a pressure test for the venting mechanism when opening beverage cans with a spring element according to an embodiment of the invention.

Figure 27 shows a reclosable can end according to the invention in sealed condition. Figure 28 shows a detailed view of the can end of Figure 27. Figure 29 shows a cross-section through the can end of Figure 27. Figure 30 shows a top view of a can end as shown in Figure 27, but without a pull tab. Figure 31 shows a bottom view of a can end as shown in Figure 27, here with a sealing zone, but without a spring element. Figure 32 shows the spring element. Figure 33 shows the reclosable can end in an opened condition, appropriate for drinking or for pouring a drink when the can end is provided onto a beverage container. The seal or bridge with the pull tab is broken. Figure 34 shows a cross-section of the can end shown in Figure 33. Figure 35 shows how different can ends according to the invention can be stacked . Figure 36 shows a bottom view of a can and of a spring element for attachment to the bottom of the can end, prior to assembling. Figure 37 shows a can end in opened position with a bottom view on a cross-section of the spring element. Figure 38 shows a reclosed can end. A detailed illustration is shown in Figure 39. Figure 40 shows an illustration of a can end in a drinking position.

DETAILED DESCRIPTION OF THE INVENTION Unless otherwise specified, all terms used in the description of the invention, including technical and scientific terms, shall have the meaning as they are generally understood by the worker in the technical field the present invention relates to. Furthermore, definitions of the terms have been included for a better understanding of the description of the present invention.

As used here, the following terms shall have the following meaning : "A", "an" and "the", as used here, refer to both the singular and the plural form unless clearly understood differently in the context. For example, "a compartment" refers to one or more than one compartment.

"About" as used here, that refers to a measurable value such as quantity, a parameter, a quantity, a period or moment, etc., is meant to include variations of +/-20% or less, preferably +/-10% or less, more preferably +/-5% or less, still more preferably +/-1% or less, and even still more preferably +/-0.1% or less of the cited value, as far as such variations are appropriate for realizing the invention that is described. It will however be clear that the value to with the term "about" relates, will also be described specifically. The terms "include", "including" and "included", as used here, are synonym with "comprise", "comprising" and "comprises" and are inclusive or open terms that indicate the presence of what follows e.g . a component, and that do not exclude the presence of additional, non-said components, characteristics, elements, members, steps, that are well-known from or described in the state of the art.

The citation of numeric intervals by means of end points includes all integers and fractions included within that interval, including these end points. In a first aspect, the invention provides a can end, preferably for a beverage can, configured for combination with a spring element according to an embodiment of the invention and formation of a reclosable can end, comprising a tearable groove and a first and second fixation element, wherein a pull tab is attachable to the first fixation element, the pull tab has an operating end that can be lifted manually away from the can end, and has an operative end opposite the operating end and positioned over the tearable groove for exercising force onto the can end when raising the operating end and opening the tearable groove, thereby providing in a pouring or drinking aperture and a torn out can end part, characterized in that on top of the can end the second fixation element is equipped for receiving the operating end of the pull tab and on the inner side of the bottom of the can end is equipped for receipt of a spring element for reclosing the can end by repositioning of the torn out can end part into said aperture. This can end can make a container such as a can, sealable and portionable. This prevents excessive use.

The can end is preferably in metal. Beverage cans are generally made of steel or aluminium. Other materials in which a tearable groove can be made, can also be used.

The term "tear groove", as used here, means a line along which the can end is thinner, is thus weakened and can be opened by exerting a force. The tear groove can be executed in a symmetric or asymmetric way.

The tear groove is preferably provided with a stopping means for stopping the ripping of the tear groove. This stopping means is preferably a stopping means as described in WO2016/ 139274 and included herein. More in particular, the stopping means comprises an abrupt change in the direction of the tearable groove or an end point of the tear groove. Said embodiment has the advantage that a pouring aperture can be reclosed from the bottom side. With the bottom side of the can end is meant, the side of the can end facing towards the beverage container. This embodiment is advantageous because the pull tab can be attached without adding extra material or thickness to the can end . No separate shut-off valve is needed . The embodiment is hygienic. For a consumer, it is an additional advantage that a beverage can is presented that is visually and practically close to a standard can.

Preferably, the first and second fixation element are selected from embodiments that do not penetrate the can end and the tearable can end part. This has the advantage that leakage and manipulation can be excluded. No material needs to be provided to keep puncture points leak-proof. Preferably, the first fixation element is a protrusion, more preferably an integral rivet obtained by means of a protrusion in the can end . In other words, it is not a separate part. The second fixation element preferably consists of two form-matching protrusions, such as a push button. It is advantageous upon assembly with the spring to attach them still further, for example by folding an edge. Another possibility is glue.

The second fixation element is preferably a protrusion with rounded edges, such as a circular shape or an oval shape. Preferably, the second fixation element has an edge for receiving the pull tab. The configuration and the size of the edge are chosen in function of the receipt and removal of the pull tab. An edge is also advantageous as a support for the pull tab when opening. Tests have shown that the opening of a can end according to the invention proceeds in phases. First, the pull tab is removed from behind the pull tab edge, for example by means of a knife or a finger nail. When released, the pull tab stays slanted, resting onto the protrusion. This makes it easier to grab the pull tab, raise it and exercise force to open the beverage can. A beverage can with this can end is thus more attractive for a wider public of consumers.

The can end part that can be torn off or was torn out is known to the skilled person as a so- called cap top. In order to optimize the opening and release mechanism of a pouring or drinking aperture, the cap top must be attached to the spring . This is possible, for example, by gluing the cap top to the spring, preferably over the entire contour, even more preferably over the entire fixation plane. Another possibility consists of providing a first receiving means onto the spring element, preferably a nose profile, and providing a form-matching, second receiving means on the tearable can end part, preferably a hook. Most preferably, a combination is made of adhesive and form-matching receiving means.

The tearable part is preferably provided with a receiving means for receipt of the pull tab end . The receiving means is preferably a hook. The end of the pull tab at the end towards the receiving means, is preferably provided with a pull tab guiding/blocking means. Preferably, the pull tab guiding/blocking means is a groove. A groove shape is advantageous to ensure that the hook and pull tab are engaging properly. When using the pull tab, guidance is provided in this way. In closed condition, the groove combined with the hook ensure that the pull tab cannot be moved back and forth unwantedly. This avoids undesired manipulation. In use, the can end is further provided with a pull tab. It comprises two functional ends. The operative end can be grabbed and lifted by a consumer. With this manipulation, the opposing end is pushed against the surface of the can end . As this end is positioned above the tearable part, force is exerted onto the tearable groove and the rivet, and the tearable groove starts to tear open.

The pull tab is preferably provided with a closure that is protected against manipulation, a so-called tamper-evident closure, also called a seal. The provision of a seal on the pull tab has the advantage that almost no additional material is needed and that no additional thickness is introduced. The provision of a seal has the advantage that the consumer can see whether the reclosable can has previously been opened.

The can end is preferably provided with a reinforcement around the first fixation element. Preferably, the reinforcement is located on the circumference of the first fixation element, but not in the zone of the tearable can end part. The use of a U-shape for the reinforcement is advantageous. When a consumer operates the pull tab and thus pushes on the tearable groove by means of the pull tab, the reinforcement ensures that the pushing forces are directed to the tearable groove. Possible damage to the can end is absorbed by the point load . The tearable can end part is preferably provided with a receiving means for receipt the operative end of the pull tab. This provides a housing for the pull tab end. This housing may provide guidance of the end towards the can end when the pull tab is actuated . To this end, the tearable can end part or cap top can be provided with a hook or another clamping system.

The tearable can end is preferably provided with a receiving means for receipt of the spring element. The reception preferably takes place without puncturing the can end part. An appropriate receiving means is for example a protrusion in the shape of a hook that is realized in a form-matching way with a corresponding hook shape provided on the spring element. This provision allows that both parts are put together in an easy way.

The can end is preferably provided with a blocking means for temporarily positioning the pull tab in an approximately vertical position with respect to the can end after tearing off the tearable can end part. This is also known to the skilled person as a so-called latching system. Thus, a means is provided for keeping the pouring aperture open in a better way. This is especially interesting for large cans of 0.5 litre and more. There is less chance that due to the strength of the pouring drink, it will hit the cap and would close the can end . The blocking means helps to hold the aperture open because the movement of the pull tab is hindered . Moreover, the cap top is given some extra depth. The blocking means is for example a reinforcement provided in the can end underneath the pull tab end for opening the cap top.

In a second aspect, the invention provides a spring element that is suitable for being received in a can end according to an embodiment of the invention for formation of a reclosable can end, characterized in that the spring element is provided with a protrusion for receipt in a fixation element of the can end, preferably without penetration of the can end, and whereby said fixation element on the opposite side of the can end is also provided for receipt the operating end of a pull tab.

The can end is often stamped out of a coated can end . The avoidance of a punctured can end has the advantage that the coating of the can end is not damaged . The coating step does not need be modified to the use of the spring element.

In a preferred embodiment of a spring element according to the invention, the surface of the spring element substantially follows the contour of the can end, preferably of the bottom side of the can end. The bottom side means the surface that is directed towards the content of the beverage can.

This embodiment has the advantage that a large surface is provided to exert force on. When the contour of the spring element mainly follows that of the can end, simple means can be provided to secure or clamp the spring to the edge.

A spring element according to an embodiment of the invention is preferably provided at its circumference with one or more, preferably two or more, standing edges realized in a form- matching way with the edge of the can end . These provisions a re simple mea ns for attaching or clamping the spring element. This works efficiently and without adding much thickness or material.

A spring element according to an embodiment of the invention preferably has a thickness between 0,05 and 0, 10 mm, more preferably between 0,07 and 0,09, most preferably of 0,08 mm. These thicknesses entail very little extra material and weight. They are appropriate for allowing a production of beverage cans at high speeds.

A spring element according to an embodiment of the invention is preferably made of a resilient material, preferably selected from spring steel, stainless steel spring steel or a polyester such as polyethylene terephthalate (PET). The material the can end, spring element and can are made of, is preferably of the same type; such as metal or synthetic materials. This is advantageous for recycling . The spring element is preferably provided with a coating. Preferably, the spring element is made of coated spring steel, or stainless-steel spring steel. Stainless-steel spring steel does not require coating . One or more folds in the spring element arise in use in the following way. A spring element from a foldable or elastic material is provided . During assembly, the spring element is applied tightly in the can end, on the sealing surface. When canning or bottling, the can end becomes bulged completely and the spring element partly because of the build-up of pressure. The pressure is the result of the use of carbon dioxide or liquid nitrogen. For the spring element, this is partly because it cannot completely follow the movement of the can end as the pressure above and under the spring element is equal. This is advantageous because, when canning, the spring element is partly free with respect of the sealing surface and consequently the beverage can circulate freely. During unsealing and venting for the first time, the can end will implode causing the spring element to flatten. The spring element no longer seals as the pull tab is already exerting a force on it.

Preferably, additional means are provided on the spring element for folding the spring element in use and/or for a better supply and circulation of air and/or venting. The application of a slot-shaped protrusion in the spring element, preferably in the region situated between the second receiving means and the beverage aperture, is advantageous to enhance further folding of the spring element in use. The location between the second receiving means and the beverage aperture, whereby the sealing region is not cut, is most effective.

Venting of the can end when opening is enhanced by providing a venting aperture in the spring element. The provision of a thickening on the spring element oriented towards the can end, enhances the circulation of air and helps with the evacuation of carbon dioxide or nitrogen.

A spring element according to the embodiment of the invention is preferably provided with a nose for receipt in a form-matching way in a receiving means that is provided on the tearable can end part. The receiving means is preferably a hook. When assembling both parts, glue can further be used.

In a third aspect, the invention provides for a reclosable can end comprising a can end as described above provided with a pull tab and a spring element according to an embodiment of the invention, characterized in that the pull tab and the spring element are accommodated on an opposite surface of the can end by means of the same fixation element. In a further aspect, the invention provides a container for a fluid or beverage, preferably a beverage can, provided with a spring element according to an embodiment of the invention, preferably also provided with a reclosable can end (100) according to an embodiment of the invention, and whereby the beverage container is made of aluminium, steel or a polyester such as polyethylene terephthalate (PET). The latter embodiment is known under the name PET can.

A standard beverage can has a coating inside. This avoids for example that cola obtains a metal taste. It ensures a better shelf life.

Preferably, the pull strength for opening the tearable groove of a beverage container according to an embodiment of the invention deviates with no more than 10% from the pull strength for opening the tearable groove in the absence of said spring element. Preferably, less force is required for opening the tearable groove of a reclosable can according to an embodiment of the invention. Preferably, the difference in force is less than 100 gram, more preferably less than 80 g, most preferably less than 50 g .

A beverage can according to an embodiment of the invention weighs less than 10%, preferably less than 5%, more than the beverage can without a spring element. For a can of 10 gram, consequently less than 1 gram is added . This is not much for an additional mechanism and additional functionality. Moreover, the easier the can end opens, the shorter the pull tab can be. A shorter pull tab hinders less when drinking.

In a further aspect, the invention provides a method for producing a reclosable beverage container, comprising the following steps:

- providing a container for receipt of a beverage with at least one open end,

- providing a reclosable can end according to an embodiment of the invention,

- closing the open end of said container with said reclosable can end, thereby providing a reclosable beverage container,

- optionally repeating the above-mentioned steps.

In a method for producing reclosable beverage containers according to the invention, the reclosable can ends are preferably stacked . Preferably, a stack of reclosable can ends is formed and the stack is transported in a sheaf to a conveyer belt with beverage cans for assembly. The assembly can take place in a device for seaming. For non-carbonated drinks, such as orange juice, drops of liquid nitrogen are added to the can prior to sealing . This provides pressure build-up. The can end may bulge.

The production speed of a method according to an embodiment of the invention is preferably at least 1200, preferably at least 1400, more preferably at least 1600 and most preferably at least 2000 reclosable beverage containers per minute. A standard beverage can production line had a production speed of 1200 cans per minute in 2014. The most performant production lines currently produce at a rhythm of 2000 cans per minute.

A can end with spring element according to the invention is appropriate for use in existing production lines. There is no hindrance to the current speed of a production line for standard cans. No production capacity should be sacrificed for the production of cans that are reclosable compared to non-reclosable cans. This is a very large economic advantage. No new investments are required at the bottling line. In a last aspect, the invention provides a method for application of a container according to an embodiment of the invention, whereby the method comprises the following steps:

- operating a pull tab at the operating end in a direction away from the can end, whereby the can end opens along a tearable groove, tearing off a can end part and a pouring or beverage aperture arises;

- operating the pull tab at the operating end in the reverse direction directed towards the can end, as a result of which a spring element, received in a second fixation element underneath the can end, repositions the torn out can end part in said aperture and the receipt of the operating end by said second fixation element on the upper side of the can end closes said can end.

The introduction of a fixation element for both the pull tab and the spring element simplifies the whole construction. A separate shut-off valve is no longer necessary. The shut-off mechanism is now based on the action of the spring element on the one hand and the pull tab on the other hand . Additional means for venting are also no longer necessary. The spring element was made thin in order to be included in the can end and to have a resilient effect. This also ensures that the spring element may fold . This enhances the venting.

In the following, the use of a beverage can according to the invention will be described . The opening and reclosing of the, preferably metal, can end is realized as follows. First of all, the operating end of the pull tab is raised away from the can end . Hereby, force is exerted onto the part in the can end, where the tea rable groove is located. The tearable groove opens and a first small opening arises. Carbon dioxide or nitrogen gas that is present in the beverage can, may escape. This is associated with a Pssscht noise. This is the venting. Upon raising the pull tab further, the tearable groove opens further and the cap top is torn off completely. Underneath the can end a spring element is located. It is taken up in the protrusion that also took up the pull tab on the opposite can end side. The spring element, in turn, carries a protrusion that is form-matching with a provision on the cap top. When completely ripping open the tearable groove, the cap top consequently stays behind on the spring . As a result of the movement of the pull tab, the spring is pushed inside the can and the torn out aperture is released . For reclosing the can end, the pull tab is again pushed towards the can end. As a result, the spring element comes back towards the can aperture. The cap top is situated again between the tearabie groove. As a result of the tension on the spring element and the suction force, the torn out can end part will strike into the opening whereby the spring element ensures the closure. The pull tab is attached behind the fixation element, here a protrusion. The opening and closing can be repeated several times with a minimal movement of the pull tab. The risk of breaking off the pull tab is small. On the sealing surface or on the spring element, a coating can be applied .

The invention is further illustrated by means of examples and figures. These are non- limiting . Preferred embodiments of the invention are illustrated in Figures 1 to 40.

EXAMPLES

Example 1 relates to an embodiment of the invention. In Figure 1, a three-dimensional illustration is shown with a reclosable can end 2 according to the invention, with a spring element 5 according to the invention therein. The can end part is partly cut away to show the inclusion of the spring element 5. The can end is seamed and in an open condition. Furthermore, the pull tab 16 with an operating end 4 and an opposing end 18 extending above a tearabie part 3 of the can end 2 are shown. When manipulating the pull tab 16, the end 18 will exert a force on this can end part. Because of the presence of a tearabie groove 9, a part of the can end will tear off. This part stays behind on the spring element 5 and will move along with the spring element and the movements the pull tab 16 makes. An important aspect of the invention is the fact that no use is made of fixations means penetrating the can end . The integrity of the can end is maintained, except for the tearabie cap top 3.

Example 2, as shown in Figures 2-4 and 11, relates to a reclosable can end 100 with a tearabie groove 9 and stopping element 22. Figure 2 shows a top view of the can end in use. The sealing can end of the pouring aperture 3 is executed symmetrically, except for the stopping element. It is provided with a protrusion 33. This protrusion can be used for applying glue. The can end is provided with a pull tap that engages at the operating end 4 over a fixation means 12. The fixation means in the figure is a protrusion 12. At the opposing end, the pull tab lies with its end under a lip 7. It is advantageous that at the end, a groove 47 is provided that is form-matching to the lip 7 end . This groove ensures on the one hand guidance when opening . In a closed condition, it ensures that the pull tab cannot be moved back and forth unwantedly. The pull tab is attached to the can end by means of a second fixation means, here a rivet 20.

Figure 11 shows a top view of the can end of Figure 2, however without a pull tab. In this figure, the U-shaped protrusion 51 is clearly shown around the rivet 20. At a standard can, this part is smaller. In this embodiment, the protrusion 51 gives additional support around the rivet 20. Also, some additional height is provided. Figure 3 shows a cross-section of the can end 100 of Figure 2. Here, it is shown that the pull tab with a receiving element 44 at its end is taken up in an indentation 43 under the lip 7 and lies in close proximity to the can end. The pull tab is attached to the can end by means of a rivet 20. The pull tab opening lies around a second fixation means 12. A spring element 5 is lying against the bottom of the can end. To the right of the figure, the edge of the spring 31 is shown, leaning against the edge of the can end 30.

Figure 4 shows a stack 36 of non-seamed can ends 2, 2', 2" as shown in Figure 3. The can ends rest on the edge. The space between different can ends was used for the closing mechanism. Furthermore, it is clearly shown that a reclosable can end with spring element 5" according to the invention hardly entails additional thickness with respect to a standard can without a spring element. This is the case both at the upper and the lower side of the can end, as rivet 20 is also present in a standard can and protrusion 12 is not thicker than a pull tab with standard thickness and the nose 7. The nose 7 is new and is not known from standard embodiments.

Example 3 relates to the first phase of the can end opening. Figure 5 and 14 show the separate parts, namely a non-seamed can end 2 as shown in Figure 2-3 and a spring element 5 for making the can end reclosable. The figure shows a view of the bottom side of the can end 2. Compared to the can ends illustrated earlier, this can end is not seamed. In Figure 5, the sealing surface 10 was additionally emphasized by indicating it in black. In Figure 14, the part that is closing off the pouring aperture, the so-called cap top, was indicated in black. In the location where the bottom of the ca n end is coloured in black in the figure, the spring touches the can end. The part indicated in black is preferably attached to the spring, for example by gluing. At the other parts, the spring element floats. The bottom side of rivet 20 is also shown. At the right, a preferred embodiment of a spring element 5 according to the invention is shown. The contour of the spring element mainly follows the contour of the can end 2. The indentation 60 at the top and the openings 21 ; 11 ensure a better air supply. The protrusion 19 mainly constitutes a reinforcement of the spring element when reclosing . The fixation means for applying the spring onto the can end are the element for coupling with the can end 23, the form-matching nose profile 37 and the edge thickenings 31. Figure 6 shows the assembled reclosable can end. The can end has been seamed . The condition that has been shown, is the initial opening . By manipulating the pull tab at the operating end 4, i.e. by pulling it away from the can end, the opposing end pushes the pull tab towards the closure of the pouring aperture 3. The push force first makes a small opening and ensures venting . Subsequently, the tearable groove rips open further. The tearable groove opens both at the left 41 and the right side 42. This is shown in the detailed view on the right side. Here, the pull tab has been omitted . As a result, the U-shaped reinforcement is shown too that was applied around the rivet 20 and outside the closure 3 in the can end 2. Furthermore, the nose 7 and thickening 50 are clearly shown that constitute an indentation for receiving the push end of the pull tab. The thickening 50 has rounded edges so that the end of the pull tab 18 can slide over it when the can is further opened (see also figure 3, 8, 13, 18).

Figure 7 shows a cross-section through the reclosable can end with spring element of Figure 8, mounted on previously open end of a beverage can 35. The can end is lying over the edge of the beverage can. It was connected to the can body 1. The operating end 4 of the pull tab is slightly raised.

Figure 8 shows a cross-section and a detailed view of the condition as shown in Figure 6 and 7. The can end is seamed and opened . Here, it is shown that at the initial opening of the tearable groove 9, a small opening 8 arises along which gas bubbles 41 can escape (arrow 32). This causes the venting of the can a nd produces the typical "Pscht" noise. In this figure, it is clearly shown that, when opening, the tamper-proof sealing is broken and the connection element 13; 14 is no longer connected . In this condition, the pull tab element 44 is still taken up in the indentation 3 under the lip 7. Example 4 relates to the second phase of the can opening with formation of the drinking and pouring opening by pushing out the can end of the opening 3. Figure 9 shows a seamed can end with pushed-out closing end. This sealing was obtained by further removing the pull tab end 4 from the can as a result of which the tearable groove fully opens. The closing end 3 is attached to the underlying leaf spring 5 and moves along to the inside. This causes tension on the leaf spring. A cross-section through the can end and the spring as shown in Figure 9, is shown in Figure 10. Figure 10 shows a seamed and unsealed can end . Note that the pull tab is slid over the protrusion 50 and pushes away the leaf spring 5 from the pouring aperture. Example 5 relates to a seamed can end in a drinking position, as shown in Figures 12 and

13. For users wishing to consume a drink from the can, the opening can be made to stand open less far. This is already obtained when tilting the pull tab or moving the pull tab end 4 in an arch of about 120 degrees and then partly folding back to the position as shown. On the illustration in Figure 12, it is clearly shown that the pull tab has a recess 47 for engaging the lip 7. Figure 13 shows a cross-section through different protrusions. It is clearly shown how a first protrusion 12 and form-matching part 23 are telescoped onto the spring and show a slight deformation as a result of the fixation of both. This is like in a push button. A second protrusion, here a rivet 20, attaches the pull tab to the can end 2. Also, it is shown how the spring 5 is taken up in the hook 7 on the cap top and how the pull tab end 18 is provided with a groove 47, that is taken up in the indentation 43 below the hook 7. The pull tab end 18 will extend over the bevel of thickening 50 upon further opening of the can end . The shortest bevel of thickening 50 functions as a stopping means when the can end is opened further by an almost vertical position of the pull tab. Connection elements 13 and 14 of the pull tab are broken; the can end is unsealed. Example 6 relates to the characteristic of the so-called tamper-evident closure. This is illustrated in Figure 15. Figure 15 A shows the closure in the position before unsealing . Figure 15B shows the position after opening the can. Here, it is shown that connection elements 13 and 14 were previously connected. Through manipulation of the pull tab, the connection between the connection elements 13 and 14 is broken. The way in which the sealing is realized, is advantageous because it uses little material and introduces no additional thickness.

Example 7 relates to alternative embodiments of a spring element according to the invention. In Figure 16, two other possibilities are shown for a spring element, appropriate for use in the present invention. Instead of openings, use can be made of depressions 28', 29' ; 25" . The protrusion 19', 19" below the spring element, situated opposite to the edge thickenings 31', 31", can also be positioned in several ways with respect to the closure of the pouring aperture 3', 3" . On the left, an embodiment is shown in which the protrusion partially follows the contour of the circular spring element. On the right, an embodiment is shown whereby the protrusion 19" partially follows the contour of the can end of the pouring aperture 3". This protrusion provides reinforcement on the spring. In Figure 17, a three- dimensional view is shown of the spring element in Figure 16, on the right-hand side, but without the closure of the pouring aperture 3". This gives a better view on the standing edge at the spring outline 31" and on the realization of the protrusion 25".

Example 8 illustrates the second application of hillock 50. This protrusion on the one hand, ensures the receipt of the pull tab 16 in the indentation 43 in non-activated condition. In activated condition, the pull tab 16 slides over the bevelled left wall to be blocked at the other side of the protrusion as shown in Figure 18. Figure 18 shows a seamed can end . This prevents the unwanted closure of the pouring aperture. The hillock 50 can thus also function as a blocking means for the pull tab 16. The embodiment shown in this example, is interesting for use in large cans, such as 0.5 or 0.75 or 1 litre beverage cans. The blocking means 50 ensures that when pouring or drinking, the drink that is present in the can does not push the spring element and the closure of the pouring aperture towards the pouring aperture, when hit. The necessary resistance is offered to hold the pouring aperture open. It is only upon manipulation by a user, whereby the pull tab 16 is folded in the direction of the can end again, that the pull tab 16 slides over the hillock 50 and goes back into the indentation 43. The opening of the pull tab at the operating end 4 is brought over the protrusion 12 to end the reclosing . The elements 7, 43 and 50 form a latching or blocking device. These do not introduce any additional thickness. Example 9 relates to an alternative can and, not seamed, with asymmetric closure of the pouring aperture. This embodiment is illustrated in Figure 19. In order to show the difference with previous embodiments, a mirror line has been drawn. This embodiment offers many advantages. A stopping means is no longer necessary. Because the contour on the right is shorter than the contour 48 on the left, the shortest side will tear open first. Because the right side is closer to the pressure point, the venting after reopening is advantageous. The venting point is closer to the pressure point of the pull tab. Because of the position, the forces can be bundled at the shortest side. The asymmetric tearable groove 9 and thus also the aperture, pours better.

Example 10 relates to alternative conical tearable groove shapes and can ends for closing off the pouring aperture. The tearable groove shown in the non-seamed can end in Figure 20 is more oval and narrower than the previous ones. The tearable groove shown in the non-seamed can end in Figure 21 has a large base situated close to the edge of the can end . Towards the pull tab 16, the tearable closure 3 closing off the pouring aperture narrows. Here, one can also see how the pull tab 16 and the tearable can end 3 are situated in a sunken part of the beverage can end 1. This is formed by a relief ridge 17.

Example 22 shows a preferred embodiment of a spring element according to the invention. Figure 22 shows a three-dimensional illustration of a seamed can end in bottled condition under pressure provided with a spring element with fold according to an embodiment of the invention. The seamed can end shown in Figure 22 is provided with this spring element, characterized by a centrally positioned fold 24 in the leaf spring . The effect of the fold 24 is illustrated in Figure 23. The upper view with a can with seamed can end shows a cross- section through the pull tab. The bottom view is a cross-section through the same can end, but turned 90° . The fold 24 offers some extra space under the can end and ensures venting when the tear groove opens. It ensures the spring is "open". When ripping open the tear groove, the spring is thus ready for the venting of the can. In other parts, it is clearly shown how the spring is lying against the can end and offers sealing. In the bottom view, it is clearly shown how the spring covers some can end parts and is floating with respect to other parts. A good venting, with typical noise, indicates to consumers that the beverage can has been opened successfully.

Example 23 shows a preferred embodiment of a spring element according to the invention. This is illustrated by means of Figure 24. At the left side, a top view is shown and at the right side, a cross-section according to line A-A. Instead of openings as shown in Figure 14, use is made of an extra protrusion 62 further holding the drinking aperture open, and two trapezoid protrusions 61. These enhance the sturdiness of the spring 5 around the drinking aperture. Furthermore, the standing edge 63 also takes less space and as a result, the pouring aperture and cap top 3 can move more to the edge or can be realized bigger. Furthermore, a standing edge 63 is provided following the contour of the can. The slot- shaped protrusion 62 serves to enhance folding, to hold the spring more open and thus also to open the drinking aperture more. The additional protrusion 62 cannot be continuous, because otherwise, it would run through the sealing surface. Example 24 relates to test arrangements. They are shown in Figures 25 and 26. Figure 25 illustrates a test arrangement 45 for measuring and comparing the necessary pull force for unsealing beverage can ends 2, 100. Figure 25 shows a measuring device 45 with pulley and disc weights. Extra weight 46 was added until the resistance of the pull tab and tearable groove had been overcome and the pouring aperture was released . The amount of extra weight was noted down and compared to standard can ends without a spring element, as they are available on the market. The base weight was 1 kg. Discs of 50 g were added each time until it ripped open. The leverage effect is double, as the radius of the wheel on the left side is twice that of the leverage. The results of a comparative test are shown in Table 1. Moreover, tests of beverage can ends with a test subject have shown that the provision of the pull tab taken up by a protrusion such as a small edge, was not bothering for opening the can end . First, the pull tab was removed from behind the edge of the protrusion. In a second phase, the manipulation of the pull tab was carried out, exerting force onto the tearable groove and opening it. Hereby, the resting on the edge of the protrusion was advantageous. There was more room to grab the pull tab underneath and to manipulate the pull tab for opening the can end .

Table 1 : Test results pull force for opening can end

Figure 26 illustrates a pressure test arrangement 58, whereby the venting mechanism of a can end was tested . A standard bottled can was cut at 3 cm under the seam. A spring element according to the invention was mounted against the can end by means of screws. The can end was included in the holder 55 of the test arrangement and fixed with a clamp 56. By means of compressed air supply 53 and a stopcock 54, compressed air was supplied to the room under the can end 52. The pressure was read from the pressure meter 57. Under the can end, a constant pressure of 2 bar or more was maintained . Subsequently, the opening of the can end was tested . It can be concluded that the venting remained standard . The can with spring opens with a "psscht" noise as is the case with a standard can. For a user, this is a recognizable noise. This proofs that the spring was in an open position Figure 27 shows a reclosable can end according to the invention in a sealed condition. It shows a pull tab, indicated in red. (See tear groove and pull-tab hillock).

Figure 28 shows a detailed view of the can end of Figure 27. Here, the tear groove is clearly shown, provided with a stopping means (left of the pull tab). The pull tab has been attached to a first protrusion, namely a rivet, in the can end. It is situated centrally. The pull tab is also shown, enclosing a second protrusion. The pull tab part that is attached to the first protrusion, further has a severable bridge connecting the operating end with the central part. When manipulating the pull tab, this pa rt is broken. This is a visual indication for a consumer that the pull tab has previously been used.

Figure 29 shows a cross-section through the can end of Figure 27. The can end (blue) is provided with a spring element (white), with a thickness of 0,05-1,0 mm, at the bottom, and a pull tab (red) at the upper part.

Figure 30 shows a top view of a can end as shown in Figure 27, but without a pull tab.

Figure 31 shows a bottom view of a can end as shown in Figure 27, here with a sealing zone, but without a spring element. The outstanding part of the can end has been coloured black. The black part can be executed in rubber, silicone or an elastic sealing material. It can be executed with or without a coating . The sealing surface can also be coated on the spring itself.

Figure 32 shows the spring element. Preferably, it is executed with a thickness of 0,05-1,0 mm, and in treated spring steel, stainless steel spring steel or PET. In the latter case, the thickness is typically 0,4 mm. Centrally at the top, a protrusion is shown that has been realized in a form-matching way with the second protrusion on the can end .

Figure 33 shows the reclosable can end in an opened condition, appropriate for drinking or for pouring a drink when the can end is provided onto a beverage container. The seal or bridge with the pull tab is broken.

Figure 34 shows a cross-section of the can end shown in Figure 33. The can end is shown in blue, the pull tab in red and the spring element in white.

Figure 35 shows how different can ends according to the invention can be stacked . This is possible even with use of an extra element compared to a standard can end, namely the spring element, typically with a thickness of 0,05-1,0 mm. In the stack of can ends, it can be seen that the closing mechanism takes very little place. The total thickness is equal to that of a standard can end. The stack of can ends is advantageous to be used on an automated production line. Figure 36 shows a bottom view of a can and of a spring element for attachment to the bottom side of the can end, prior to assembly.

Figure 37 shows a can end in opened position with a bottom view on a cross-section of the spring element.

Figure 38 shows a reclosed can end . Note that the hillock in the pull tab has been broken. A detailed view is shown in Figure 39.

Figure 40 shows an illustration of a can end in a drinking position. The can end has been drawn transparently. The lower, green arrows indicate how a beverage will come out of a container with this can end. The upper, blue arrows indicate how air will flow around the can end, between the spring and the can end, and subsequently towards the interior of the can.

Claims

1. Can end (2), preferably for a beverage can (35), configured for combination with a spring element according to any of claims 8 to 14 and formation of a reclosable can end (100), comprising a tearable groove (9) and a first (20) and second (12) fixation element, wherein a pull tab (16) is attachable to the first fixation element (20), the pull tab has an operating end (4) that can be lifted manually away from the can end (2), and has an operative end (18) opposite the operating end (4) and positioned over the tearable groove (9) for exercising force onto the can end (2) when raising the operating end (4) and opening the tearable groove (9), thereby providing in a pouring or drinking aperture (15) and a torn out can end part (3), characterized in that on top of the can end (2) the second fixation element (12) is equipped for receiving the operating end (4) of the pull tab (16) and on the inner side of the bottom of the can end (2) is equipped for receipt of a spring element (5) for reclosing the can end (2) by repositioning of the torn out can end part (3) into said aperture (15).

2. Can end (2) according to claim 1, whereby said first and second fixation elements do not penetrate the can end (2) and the tearable can end part (3).

3. Can end (2) according to claim 1 or 2, whereby the tearable can end part (3) is equipped with a receiving means (7) for receipt of the operative end (18) of the pull tab (16) and for receipt of the spring element (5).

4. Can end (2) according to claim 3, whereby the tearable can end (3) is equipped with a blocking means (50) for temporarily positioning the pull tab (16) in an approximately vertical position with respect to the can end (2) after tearing out the tearable can end part (3).

5. Can end (2) according to any of claims 1 to 4, whereby the pull tab (16) is provided with a manipulation resistant closure (13, 14).

6. Can end (2) according to any of claims 1 to 5, whereby the can end (2) is provided with a reinforcement (51) around the first fixation element (20), whereby the reinforcement is located at the circumference of the first fixation element (20) outside of the tearable can end part (3).

7. Can end (2) according to any of claims 1 to 6, whereby the tearable groove (9) is provided with a stopping means (22) for stopping the tearing in of said tearable groove (9).

Spring element (5) suitable for receipt in a can end (2) according to any of claims 1 to 7 for formation of a reclosable can end (100), characterized in that the spring element (5) is provided with a protrusion (23) for receipt in a fixation element (12) of the can end, preferably without penetration of the can end (2), and whereby said fixation element (12) on the opposite side of the can end (2) is also provided for receipt of the operating end (4) of a pull tab (16).

Spring element (5) according to claim 8, characterised in that the surface of the spring element (5) substantially follows the contour of the can end (2).

Spring element (5) according to claim 8 or 9, characterized in that the spring element (5) is provided at its circumference with one or more, preferably two or more, standing edges realized in a form-matching way (31, 63) with the edge (30) of the can end (2).

Spring element (5) according to claim 10, characterized in that the spring element has a thickness between 0,05 and 0, 10 mm.

Spring element (5) according to any of claims 8 to 11, characterized in that the spring element (5) is made out of a resilient material, preferably selected from coated spring steel, stainless-steel spring steel or a polyester such as polyethylene terephthalate (PET).

Spring element (5) according to any of claims 8 to 12, characterized in that said spring element comprises one or more means for a better supply and circulation of air and/or venting .

Spring element (5) according to any of claims 8 to 13, provided with a first receiving means, preferably a nose profile (37), for form-matching receipt in a second receiving means provided on the tearable can end part (3), preferably a hook (7).

Reclosable can end (100) comprising a can end (2) according to any of claims 1 to 7 provided with a pull tab (16) and a spring element (5) according to any of claims 8 to 14, characterised in that the tearable can end part is connected with the spring element, and the pull tab (16) and the spring element are accommodated on an opposite surface of the can end by means of the same fixation element (12).

16. Container for a fluid or beverage, preferably a beverage can (1), comprising a reclosable can end (100) according to claim 15, whereby the container is made of aluminium, steel or a polyester such as polyethylene terephthalate (PET).

Container according to claim 16, characterized in that the pull strength for opening the tearable groove (9) deviates with not more than 10% from the pull strength for opening the tearable groove (8) in the absence of said spring element (5).

Method for producing a reclosable beverage container (1) according to any of claims 16 or 17, comprising the following steps:

- providing a container for receipt of a beverage with at least one open end (35),

- providing a reclosable can end (100) according to claim 16,

- closing the open end of said container with said reclosable can end (100), thereby providing a reclosable beverage container (1),

- optionally repeating the above-mentioned steps.

19. Method according to claim 18, whereby reclosable can ends (100) are stacked (36).

20. Method according to claim 18 or 19, whereby the production speed is at least 1200, preferably at least 1400, more preferably at least 1600 and most preferably at least 2000 reclosable beverage containers per minute.

21. Method for application of a container (1) according to claim 16 or 17, whereby the method comprises the following steps:

- operating a pull tab (16) at the operating end (4) in a direction away from the can end (2), whereby the can end (2) opens along a tearable groove (9), tearing off a can end part (3) and a pouring or beverage aperture (15) arises;

- operating the pull tab (16) at the operating end (4) in the reverse direction towards the can end (2), as a result of which a spring element (5), received in a second fixation element underneath the can end (2), repositions the torn out can end part (3) in said aperture (15) and the receipt of the operating end (4) by said second fixation element (12) on the upper side of the can end (100) closes said can end.