EP3046849A1

EP3046849A1 - Sealing disk for the induction sealing of a container

Info

Publication number: EP3046849A1
Application number: EP14766430.4A
Authority: EP
Inventors: Heinz-Werner Rohrka; Rainer Kröger
Original assignee: Alfelder Kunststoffwerke Herm Meyer GmbH
Current assignee: Alfelder Kunststoffwerke Herm Meyer GmbH
Priority date: 2013-09-20
Filing date: 2014-09-09
Publication date: 2016-07-27
Also published as: WO2015039927A1; DE102013015581B3

Abstract

The invention relates to a sealing disk (10) for closing openings of containers (5), which sealing disk has an edge (11) that fits an edge of the opening. A film (20) serves to inductively couple heat into the sealing disk (10). A sealing layer (25) on the side of the film (20) facing the interior of the container (5) serves to seal the sealing disk (10) onto the edge of the opening of the container (5) in a sealing manner. One or more layers (30) are arranged on the side of the film (20) facing away from the sealing layer (25). A part of the sealing disk (10) is designed as a handle (35) for opening the opening of the container (5) closed by means of the sealing disk (10). At least one of the layers (30) has weakening lines (36) on the side of the film (20) facing away from the sealing layer (25), which weakening lines serve to form an outline of the handle (35). At least one of the weakening lines (36) leads in the direction of the center of the sealing disk (10) from a starting point (12) at the edge (11) of the sealing disk (10). An area section (37) is constructed adjacently to the weakening lines (36) in such a way that a layer having an adhesion-reducing application (31) is arranged between two of the layers (30) or between the film (20) and the lowest of the layers (30).

Description

Sealing disc for induction sealing of a container

The invention relates to a sealing disc for closing of mouths of containers, wherein the mouth has an edge and the sealing disc has a matching edge, with a film for the inductive coupling of heat in the sealing disc, with a sealing layer on the inside of the container zuwendenenden Side of the film for sealing sealing of the sealing disc on the edge of the mouth of the container, with several layers on the side facing away from the sealing layer side of the film, with an adhesive layer between two of the layers and with a formed as part of the sealing disc handle for opening the mouth of with the sealing disc closed container, wherein at least one of the layers is provided on the side facing away from the sealing layer side of the film with a dividing line for forming an outline of the handle.

Containers are used to hold content, for example, to receive drinks or powdered foods or other substances. The containers have on their top an opening or mouth. Often it is desired or even necessary to close this container mouth with a disc-shaped seal, which closes the contents tightly against external influences.

From EP 1 160 177 B1 and DE 601 04 058 T2 a lid member for containers is known, which are intended for example for the inclusion of yogurt. The cover element has a grip tab. The pull tab can be pulled to pull the lid member off the container. A reclosability is not intended and not possible.

EP 1 842 792 A1 describes a membrane for winding containers. A grip tab is provided which rests on an adhesive-free area. The grip tab can be grasped and pulled by the user. Such winding containers are mainly used for savory biscuits or other content to be consumed in one go and, in particular, are not resealable. Already from DE 91 08 868 U1 a sealing disc for closing a container is known, which can be fixed by induction sealing on the opening edge of the container. The sealing disc has for this purpose a metal foil. On the underside of the metal foil, ie on the side adjacent to the opening edge, a very thin plastic film is applied. It is now possible to attach this film firmly on the top edge by means of induction sealing. If eddy current is induced in the metal foil from above, it is heated accordingly, as well as the underlying, thereby melting plastic film. This also applies to the upper edge of the container, for example a plastic cup. The result is a relatively firm connection of the plastic film with the upper edge of the cup. The entire mouth area is then covered with a screw cap, which mechanically protects the sealed layers of the sealing disc and the mouth area. The user must, so he comes to the contents of the still sealed with the sealed layers of the gasket container, remove these layers of the gasket in a suitable form of the mouth. For this purpose, there are various used in practice operations that facilitate this process.

From DE 10 2007 014 084 B3, for example, an outwardly projecting gripping bottle is known. This projects beyond the opening edge of the container. The user can attack on this pull tab, pull it up and then remove all parts of the sealing disc in one go.

This concept is widely used and has also proven itself. The disadvantage is that the outwardly projecting beyond the radius of the mouth of the container handle latch before the only time at which it is needed and used, as possible must be accommodated so that it is not itself damaged on the one hand and then no longer meet their purpose can, and that on the other hand does not interfere with the closing process. It should be remembered that often a screw cap on the outside and on the mouth of the container must be screwed and outwardly projecting sealing flaps must then be designed so that they do not fall into the screw and either affect the tightness or even through the thread to be attacked. There are possibilities for this, but sometimes require an elaborate adaptation of the screw cap or as in EP 2 045 194 B1 require a complicated folding this tab into the interior of the gasket in between other layers.

Another idea is, as in EP 1 472 153 B1 or DE 199 20 572 A1, to form the uppermost layer of the sealing disk such that it forms a kind of upwardly projecting fold, against which a user can then attack the entire Pull off sealing washer.

This concept, which has also been widely used, has the disadvantage that the uppermost layer either can not be adhesively bonded to the underlying layer or can be fastened to it, so that a loose, upwardly projecting and palpable fold actually results, or the uppermost layer can be removed from the outset formed by additional material so that it forms with this additional material an upwardly projecting and again on the foot of the fold returning layer.

In both cases, the problem arises that this then loose upwardly projecting fold is sensitive to rotational movements of the screw cap thereon and measures must be taken to protect the fold despite their loose resting on the underlying layers against damage. In addition, the formation of such wrinkles over portions of the surface of the sealing disc is not a problem and therefore expensive.

If one refrains from an upwardly projecting fold or an outwardly projecting tab, thus giving the user no handle to open, he must try to destroy the sealing disc with a knife or other object or if necessary with his fingers and force in order to To get content. This is often unappetizing for the user and leads to the spilling of the container contents, since these opening operations are then uncoordinated and difficult to predict for the manufacturer of the corresponding product. From DE 10 2012 006 934 B3, the idea is now known to provide lines of weakness on the top of the sealing disc, which form an outline of a handle. At least one of the lines of weakness leads from the edge of the mouth in the direction of the center of the sealing disc. This makes it possible to provide the user with a handle available without upwardly erect or erected folds or outwardly projecting or unfoldable tabs must be provided. However, the user is no longer forced to destroy the sealing disc with a knife or other object or, if necessary, with his fingers and force in order to get to the contents of the container. This often unappetizing for the user and leading to spill the container contents operations can be avoided.

After unscrewing the screw cap, the user looks directly at the top of the sealing disc and looks at a perforation, which can also be highlighted in color. The user pierces in this conception now the sealing washer in the region of the handle, which is also possible due to the weakening line or the perforation. The behavior of the sealing disc is very predictable both for the user as well as for the bottler of the container contents.

Nevertheless, this concept leaves nothing to be desired. For example, piercing the gasket is a process that still requires a metered amount of force and may cause clumsy users to get their finger into the container, even though they did not intend it at the time.

The object of the invention is therefore to propose a sealing disc, which on the one hand manages without wrinkles and projecting tabs, but also has the additional advantage of being able to better avoid unintentional penetration of the user's fingers into the container interior below the sealing disc during the opening process.

This object is achieved in a generic sealing disc in that a surface portion adjacent to the parting line is constructed so that the adhesive layer has a reduced adhesive force in this surface portion or is omitted or covered with a layer having an adhesion-reduced application, and that the parting line partially surrounds the surface portion to form a tab-shaped handle. By providing a certain surface portion with an adhesion-reduced application, it becomes possible to push the region adjacent to the parting line not only as in DE 10 2012 006 934 B3 inwardly into the container by exerting force on the perforations or other weakening lines but by creating here an attack area for a train of a small surface section upwards.

The user can now attack at the dividing line and pull up on the film or the lower layers fixed and fixed surface portion up. Once the user has a small area section in his hand, he can then pull the entire area of the not completely framed by the dividing line surface upwards, since the dividing line allow an upward lifting.

In this way, the user has the entire area between the preferred convex parting line in his hand after this lifting operation.

With the aid of the tab-like handle thus formed, the user can now easily and easily transfer force to the sealing disc, without piercing it and having to penetrate into the container. The user can transfer this force with the help of his thumb and his forefinger or other fingers on the tab-like handle and pull on this.

This tensile force can now be used for removing the sealing disc from the mouth of the container.

In a preferred embodiment, a high composite adhesion between the outer film is now provided outside the region of the tab-like handle and the induction film used for induction sealing and the sealing layer attached thereto. In this case, the Bonding higher than the adhesion of the sealant layer on the mouth of the container.

This results in the application of further tensile force by the user leads to the tab-like handle that the train of the tab-like handle on the firmly associated with this tab-like handle remaining surface areas of the associated layer and the adhesion with high adhesion attached to her induction film is transmitted and thus the entire sealing disc is released by loosening the thus peelable sealing layer of the mouth of the container.

In this case, the user can pull the tab-like handle either in one direction, which corresponds to a further mounting of the tab-like handle, or even exactly perpendicular to apply the force in a plane corresponding to the vertically erected tab-like handle.

In another embodiment with a particularly tight sealing layer, the sealing disc is not completely withdrawn, but raised by the provision of lines of weakness between the ends of the dividing line and the edge of the mouth of the container so that a defined partial opening of the sealed layers of the sealing disc on the Container mouth results.

The container mouth is opened to a considerable extent and can then be used as access or for dumping.

Three different variants are basically possible for the construction of the sealing disc according to the invention. An adhesive layer is modified in each case. This is in particular the adhesive layer, which acts as a laminating adhesive if the film used for the induction of the sealing disc is to be laminated with those layers which are located on the side facing away from the sealing layer side of the inserted film for induction.

The modification of this adhesive layer can take place in that the surface area remains free of the adhesive layer which is adjacent to the dividing line. This free sticking can be achieved by first printing the adhesive layer used for laminating in a corresponding surface pattern on either the film used for induction or on the film to be laminated with it. Since the surface pattern is known in advance, the pressure roller can be equipped accordingly.

A similar form can be used if the adhesive layer is not to be completely omitted, but if certain portions are to be provided with an adhesive layer which exerts only a reduced adhesive force.

As a third alternative, a release coating is applied in addition to a preferably full-surface adhesive layer. This separating varnish could be applied, for example, in counterpressure to the polyethylene terephthalan film or in another embodiment also in straight printing on the film used for the induction (in particular an aluminum foil). The application of this release coating could be done for example in the so-called flexographic printing process or else in the gravure printing process.

After then the film used for induction has been laminated together with the overlying layers, in this embodiment, the release coating can exert its release effect on the adhesive layer, in particular the Kaschierklebeschicht, and thus allow the simplified removal of this surface area.

It is particularly preferred for the adhesion-reduced coating to be a non-stick coating, in particular a polyamide coating or a polyester coating. As a result, a particularly advantageous production and reliable use of this surface portion during the tearing process is possible.

Technically, it has been proven that the order with an application amount of more than 1, 0 g / m ² and less than 2 g / m ² , in particular more than 1, 3 g / m ² and less than 1, 5 g / m ^{2 is} applied. This release varnish has proven particularly suitable for precise separation of the layers from one another with corresponding adhesive layers. The release lacquer or the non-applied and partially omitted adhesive layer, that is, the laminating adhesive not applied in a certain area section, are responsible for the fact that a tab-like handle or, more simply, an opening tab can be formed. Preferably, the separation line is cut only in the outer layers of the sealing disc on the contour of this release coating or the surface area of the missing laminating adhesive with the aid of a laser. This cutting already physically creates the opening tab. Depending on the shape of the tab and the desired properties of the gasket, the release coating is printed or the adhesive is not applied. The dividing line is based on the shape of the associated surface area.

In both said embodiments, there is no adhesion between the outer layer of the sealing disc on the one hand and the film used for induction in the inner region of the sealing disc on the other. In practice this means a lack of adhesion between the PET layer and the aluminum layer. In order to offer the user a particularly good opportunity to lift off the entire part of the boundary line framed by the slight lifting of the surface portion and quasi a novel "lug" bidding surface, it is preferred if the dividing line a convex line on the surface of the gasket describes, and when the surface portion is disposed adjacent to the parting line and lies on the convex side of the parting line.

The dividing line can not only be particularly well recognized by the user in the formation of such a shape, by the provision of the surface portion with the tab-like handle exactly farthest away from the edge Also the peel-off process is the most reliable and steady and beyond defined prepare and provide the user.

A particularly suitable shape arises when the sealing disc is circular, when the dividing line forms an isosceles triangle with a rounded tip, and when the surface portion fills the rounded tip on the convex side of the dividing line symmetrically to the bisector of the isosceles triangle. A particularly preferred embodiment is characterized in that the dividing line is formed by a perforation, in particular by a lasered perforation, and when this perforation extends through all the layers on the side of the film facing away from the sealing layer, but not through the film itself ,

For the formation of the novel grip tab, therefore, only the side of the sealing disc viewed from the container is preferably provided with the dividing line, ie perforated in particular by means of a laser. This area is preferably a film formed from polyethylene terephthalate (PET).

As an alternative to a PET film, other monofilms or composite films are also possible for the side of the sealing disc which is viewed from the outside of the container. The thickness of these layers is preferably in the range between 20 μηη and 150 μηη. Besides polyethylene terephthalate (PET), oriented polypropylene (OPP), oriented polyamide (OPA) and high density polyethylene (HDPE) are also primarily considered.

These layers or films are then perforated together with the polyethylene terephthalate.

The further layers or layers below this polyethylene terephthalate film, in particular therefore the induction film and the sealing layer, are not damaged by lasering. This can be done, for example, by that the perforation is carried out by lasering through the corresponding layer composite before the sealing disc is formed by laminating the polyethylene terephthalate film with the induction foil. The induction process is therefore not affected.

In this way, a particularly strong and easy for the user tangible grip tab, with which the user can then deduct then the complete sealing disc from the mouth of the container. In order for this process to be carried out properly without tearing down portions or becoming unwieldy, a thick, comparatively stiff film, as in this embodiment of the invention, is very advantageous.

It is not absolutely necessary that the tab-like handle thus formed sits precisely in the center of the surface of the corresponding layer of the sealing disc. Another placement can be used depending on the application and also produced. Thus, such a tab-like handle can also be arranged in the edge region of the sealing disc. The corresponding layer of the sealing disc can be provided with additional customer-friendly imprints, such as with pictograms or a corresponding inscription or other indications, for example along the perforation, which can facilitate the customer's understanding of the procedure.

It is also possible to color the entire tab from the surrounding area or to make the tab in color.

The sealing disks receive a shape corresponding to the size of the mouth of the container and are thus generally preferably round, in particular circular. They can be used by the manufacturer of the closures and the container without additional effort, since the actual positioning of the perforation relative to the container edge is irrelevant. It does not matter where, for example, a special turn of the thread attaches and it does not have to special recess about for tabs or folds in the container lid consideration be taken.

It is also irrelevant how the container itself is shaped as long as the mouth of the container is accessible to the user.

The sealing disk as a whole preferably has a puncture resistance of less than 30 N. The side or surface of the sealing disc opposite the container mouth is provided with sealing layers, which can be adapted to the corresponding choice of material of the container. So a seal against containers made of glass as well as of different plastics (HDPE, LDPE, PP, PET or PVC) is possible. The sealing layers can be set firmly sealing or peelable and have a thickness of preferably between 3 μηη and 100 μηη.

The sealing layers may be extruded or laminated on the other layers of the sealing disc.

The induction layer or induction foil itself, which carries on one side this sealing layer and on the other side the reinforcing layer, is preferably a metal foil, in particular an aluminum foil and has a thickness of preferably between 6 μm and 50 μm. The sealing layer can be applied to this film, for example by means of extrusion coating or lamination or painting. It is also possible to place a primer or a laminating adhesive between the layers, amounts of from 0.5 to 5 g / m ² dry being preferred. Depending on the embodiment, the dividing lines, lines of weakness and perforation lines can be introduced at different times or in different method steps; This is preferably done in the film that forms the reinforcing layer, before merging with the induction layer and the other layers or after the production of the Layer composite, from which the sealing disks are subsequently produced.

The sealing washers produced in this form are brought together in a web and then preferably punched to size.

Between the induction layer and the reinforcing layer provided with the dividing line, weakening line or the perforation, a further layer can be provided, in particular a foam film. For this purpose, preferably has a foam sheet based on polyethylene or polypropylene with a thickness of preferably 15 μηη to 250 μηη proved to be particularly practical.

In a preferred embodiment it is provided that further layers are provided and designed such that they seal the mouth of the container after removing the film and re-laying the layers.

This additional element forms a so-called reseal part. It may in particular have a cardboard or a foam sheet. The carton or foam sheet may be coated or laminated on one or both sides with a plastic film such as polyethylene terephthalate (PET), oriented polypropylene film (OPP), high density polyethylene (HDPE) or low density polyethylene (LDPE) films. Also possible is a coating with paper or cardboard. These reseal parts offer the possibility that the user after initial opening by raising and pulling the tab-like handle and the removal of parts or the entire sealing disc can still make a closure of the container in which he screwed the cap with the remaining reseal - Part screwed again. As a result, at least a temporary tight closure is possible again.

This so-called reseal part can be connected by means of a wax lamination or an extrusion lamination with the reinforcing layers or the release lacquer thereon and then dissolves only when first screwing the screw cap. In other embodiments, no connection of this Reseal part is provided with the underlying layers from the outset, so that it is then a two-piece sealing disc.

Especially in a combination of the embodiment according to the invention with the area adjacent to the dividing line surface portion with the reduced bond strength on the one hand and the proposed reseal parts of various types on the other hand, considerable other advantages. Thus, the perfectly flat and interrupted only by the dividing line top of the other parts of the sealing disc is a particularly suitable surface for the releasable connection and / or the rotational movement relative to the upper parts of the sealing disc

With the present invention, however, a sealing disc is possible, which can have both a sealing film and a Reseal part. The entire sealing disc with the opening aid or grip tab is intended for a closure. The seal with the sealing disc is applied to a container and there the disc is inductively sealed onto the container mouth. The sealing film with the reseal part is produced by a polymer lamination or by a wax lamination.

After the first opening of the closure on the container remains in this embodiment, a part of the sealing disc in the closure (the reseal part thus remains in the lid) and the sealing film with the opening aid initially remains on the container mouth. Then, with the help of the opening aid, the consumer can now remove the sealing film from the container mouth.

In the invention, the formation of this opening aid can be formed by at least two different variants: It is applied in the first variant, the laminating adhesive only in the zones where you need a high bond strength. The glue-free zone, however, is used to form the opening aid. With the help of a laser, the adhesive-free zone is cut so that it forms a tab for peeling off the sealing foil. The same is possible in the second variant with a non-stick paint. Where the non-stick coating is applied, the laminating adhesive will not stick later, and here again a tab can be formed. The sealing film consists of several layers. The outer foil forms the later grip tab. In addition to the film for the grip tab, in particular, an aluminum foil is used for the induction sealing and a peelable sealing layer for the sealing on the respective container mouth. Between the individual layers, another layer of plastic can be classified.

Further preferred features can be found in the dependent claims and the description of the figures.

In the following an embodiment of the invention will be described in more detail with reference to the drawing. 1 shows a perspective view of a container with a sealing disk according to the invention; a perspective view of a container of Figure 1 at an opening; a representation similar to Figure 2 at more advanced opening process; a plan view of an embodiment of a sealing disc; a schematic plan view of a sealing disc according to the invention with a first embodiment of a tab-like handle; a schematic plan view of a sealing disc according to the invention with a second embodiment of a tab-like handle; a schematic plan view of a sealing disc according to the invention with a third embodiment of a tab-like handle; and a schematic plan view of a sealing disc according to the invention with a fourth embodiment of a tab-like handle.

In the arrangement shown in Figure 1 from a container 5 with a screw cap 6 and a placed between the mouth of the container 5 and the screw 6 sealing washer 10 can be seen that for this sealing washer 10 more layers or films one above the other are arranged. The complete sealing disc 10 with a peripheral edge 1 1 is circular in the illustrated preferred embodiment and is applied to the opening edge of the mouth of a container 5, of which in particular the mouth is indicated schematically.

The container 5 can have very different shapes. It may be made of glass or plastic or other material and is filled (not shown), for example with a drink or with a powdered food or similar materials.

The container 5 is closed with a screw cap 6, which is also indicated schematically. Before the first opening the screw cap 6 is continuously screwed tight. When first opening the screw cap 6 is removed by the end user in the illustrated embodiment, for the first time. For this purpose, he turns the screw cap 6 and removes it from the container. 5

The sealing disk 10 has as a central element in the illustrated embodiment of the sealing disk 10, a film 20 for the inductive coupling of heat in the sealing washer 10. This film 20 consists of an electrically conductive material, in particular a metal, usually aluminum.

This film 20 is provided on the mouth of the container 5 facing side with a sealing layer 25. The sealing layer 25 thus rests on the opening edge around the mouth of the container 5.

After filling the container 5 with filling material, the entire sealing disc 10 has been placed on the container mouth or placed there. Then inductively into the sealing disk 10 and thus in particular in the film 20 heat was coupled. This heat causes the entire sealing layer 25 to melt, especially where the sealing layer 25 rests directly on the edge of the mouth of the container 5 in the region of the edge 11 of the sealing disk 10. This mouth of the container 5 is heated. The sealing layer 25 in the region of the edge 1 1 of the sealing disc 10 thus connects firmly in this area with the upper edge of the container 5. It is in a sense sealed. On the opening edge around the mouth of the container 5 and the sealing layer 25 side facing away from the film 20 is another layer 30, which serves as a reinforcing layer here. This layer 30 consists for example of polyethylene terephthalate (PET), biaxially oriented polypropylene (BOPP), monoaxially oriented polypropylene (MOPP) or stretched polyamide film (OPA). It is firmly applied to the induction foil, in particular by means of lamination. For this lamination a laminating adhesive is used, which forms an adhesive layer 32 in this embodiment. The layer 30 has a dividing line 36, which is indicated in FIG. 1 and explained in more detail later, for forming a handle 35.

Above this layer 30, a further layer 40 can be seen in FIG. 1. This layer 40 is fastened to the underside of the screw cap 6, for example, sealed, glued or mechanically clamped. The screw cap 6 holds after sealing the container 5 at the bottler of the content, the entire sealing disc 10 of sealing layer 25, film 20 for coupling heat, reinforcing layer 30 and additional layer 40 additionally firmly on the container 5. At the first opening now the screw cap. 6 first time accepted. The end user unscrews the container 5. In this case, the layer 40 dissolves together with the screw cap 6 of the container 5 with the remaining thereon sealing layer 25, foil 20 and reinforcing layer 30, since an existing adhesive layer between the layer 30 and the layer 40, the weakest connection in the resulting composite of the sealing disc 10 is.

The resulting situation can be seen well in Figure 2, where in perspective already a separation of the screw cap 6 above from the container 5 is done below. The user now looks at the top of the topmost layer, which still rests on the mouth of the container 5. This is the layer 30. Here, it can be clearly seen in this illustration that on the upper side of the layer 30, a handle 35 in a sectional form is apparent, which is formed by the dividing line 36 in the form of a perforation produced here by means of a laser.

The dividing line 36 extends in the illustrated preferred embodiment in an arc between two end points on the layer 30 of the sealing disc 10. Overall, a convex parting line 36 is formed. It represents approximately an isosceles triangle, wherein the two end points form the basis of the isosceles triangle with the connecting line extending between them, while the bent portion of the parting line 36 represents a rounded tip. This rounded tip is the area farthest from the two endpoints.

The area adjacent to this rounded tip on the convex side of the dividing line 36 forms a surface portion 37. From this area portion 37, the handle 35 is subsequently discussed further.

The region below this surface portion 37 of the layers 30 is namely provided above the film 20 with a Abdecklack 31, as will be better understood in the following. The user, who is now separated only by the sealing disc 10 of the substance actually interest him inside the container 5, recognizes the parting line 36 and the adjacent surface portion 37, possibly supported by pictograms or imprints or a colored design, and engages the Surface section 37 at.

This situation is now clearly visible in FIG. In fact, it can be seen in FIG. 3 that the user has attacked at the parting line 36 on the surface section 37. Namely, the resist 31 below the layers 30 and above the film 20 (or in other alternative embodiments also between two layers of the layer package 30) covers the surface portion 37 Adhesive layer 32 from. This leads to the fact that the surface portion 37 is not connected to the film 20 and due to the perforation or separation line 36 can also be easily separated from the surrounding area of the layers 30. As a result, the user can now lift this surface section 37 upwards, resulting in a tab-like handle 35, which can now be removed more and more.

In the figures, two different embodiments are indicated. For a first embodiment, it is assumed that only the parting line 36 is provided which largely surrounds the surface section 37. If you pull now on the handle 35, this is well possible by the tab-like handle 35, and it can be exerted considerable force on the entire sealing washer 10. Then the handle 35 with the surface portion 37 could now be used to tear the entire rest of the sealing washer 10 up.

In a second embodiment, weakening lines 38 are now additionally provided. The weakening lines 38 connect the two end points of the dividing line 36 with the edge 1 1 of the sealing washer 10. In the illustrated embodiment, the dividing line 36 is thereby extended to two connection points 12 at the edge 1 1 of the sealing washer 10.

In this embodiment, the Abdecklack 31 now occupies the entire area on the convex side of the dividing line 36. It thus covers the adhesive layer 32 in this entire area in addition to the area section 37. Then, the handle 35 can be completely removed and between the user and the contents of the container 5 is only the film 20 and the sealing layer 25. This area can then be opened separately just because it is very thin. Then you would have a defined pouring hole within the mouth of the container. 5

In other embodiments, not shown, no resist 31 is provided, but instead the adhesive layer 32 is applied so that it does not exist even in the surface portion 37 or has a lower bond strength. This can be achieved by using this adhesive layer 32 previously applied with a suitably prepared roller on the later laminated together layers.

In any case, due to the sectional shape of the weakening line 36, a type of tab or handle 35, which has previously been integrated surface component of the reinforcing layer 30, is produced.

Thus, unlike conventional projecting folds or outwardly projecting tabs, this is not an additional surface component or an additional attached element of the sealing disk 10, but a non-projecting, protruding or otherwise conspicuous integrated surface component of one of the layers of the sealing disk 10. If the user then tears off this handle 35 completely, he has automatically created an opening in the sealing disc 10 or pulled it off completely in the various embodiments. In both cases, he can now introduce a teaspoon or he can pour about a liquid by tilting the container 5.

The shape of the opening created is either the entire mouth of the container 5 or it is predetermined by the perforation and exactly defined and predictable for the user, so that it can not come to surprising and unpredictable reactions of the contents by spilling or the like. Moreover, it is neither necessary nor can it happen in the case of a careless user that this gets into the container interior with his finger or several fingers. The entire opening movement takes place above the mouth level of the container 5. Even in the embodiment in which only the thin metal foil 20 and the sealing layer 25 remain in a small area and have to be punctured, the teaspoon or some other measure that is available anyway is suitable for this purpose. In other embodiments, by gripping the handle 35 and correspondingly angular pulling, the entire sealing disk 10 or its layers still located on the opening edge of the mouth of the container 5 can be removed.

In FIG. 4, the embodiment of the sealing disk 10 can be seen in plan view. This view is given to the user after he has unscrewed the screw cap 6 from the container 5 and looks directly from above on the sealing washer 10. He sees the top layer, this is the reinforcing layer 30. On this reinforcing layer 30, the dividing line 36 is characterized, which largely surrounds the surface portion 37. At the end points of the dividing line 36, the weakening line 38 connects, which extends from the first connection point 12 on the edge 1 1 of the sealing disc 10 to the dividing line 36 and from there to the second connection point 12 thereafter. Here one sees particularly well the isosceles triangle with the rounded tip in the parting line 36, to which the surface portion 37 connects, which forms the handle 35 here.

If the user raises the surface section 37 in the region of the parting line 36, which is easily possible due to the covering varnish 31 (see FIG. 3), then this handle 35 is torn completely out of the remaining surface of the sealing disk 10 along the weakening line 36.

Looking back into FIG. 1, it can still be seen that a release lacquer may still be located on top of the reinforcing layer 30 above the parting line 36, which provides a simplified separation of the reinforcing layer 30 and the underlying layers from the further, above-lying layers 40 which form the so-called reseal part for reclosability.

Furthermore, between the reinforcing layer 30 and the induction foil 20 there may also be a foam foil, in particular a foamed foil of polyethylene or polypropylene. In the figure 5 is a plan view of a sealing disc 10 can be seen. It can be seen on the reinforcing layer 30, which occupies the entire surface of the top of the circular sealing disc here. In this reinforced layer 30 can be seen the dividing line 36, which is drawn off-center in a symmetrical arc, which opens to the edge 1 1 of the sealing washer 10 out. Between the two end points of the curved dividing line 36 one can think of a baseline being pulled. Between this base line and the arc, the surface portion 37 is provided. He is clearly highlighted here. On the side facing away from the user of the reinforcing layer 30 is in the area of the surface portion 37, a reduced adhesion order or Abdecklack or no adhesive layer, while in the rest of the remaining surface area of the sealing disc 10, an adhesive layer 32 and no such adhesive reduced application or Abdecklack is provided.

If a user now grasps this surface section 37 in the region of the parting line 36, he can easily raise it from the surface lying in the sheet plane and fold it upwards around the base line until this surface section 37 projects vertically out of the sheet plane in the form of a tab-like handle , Then the user can attack on this tab-like handle and pull and leave his pulling force acting on the tab-like handle. It is clear that this tensile force is then transmitted via the base line, which is not weakened or separated, in the surface region of the sealing disc 10, which is immediately adjacent here and in this embodiment is relatively close to the edge 1 1 of the sealing washer 10. This has the consequence that the tensile force acts directly against the adhesive force of the sealing layer 25 (see FIG. 1 or FIG. 3) and makes it possible to break up this adhesive force. Once this is done, the entire sealing disc 10 can be removed by further application of traction clean from the edge of the mouth of the container.

FIG. 6 shows a further embodiment. Again, one looks from above on the reinforcing layer 30 of the sealing disc 10 and sees here another shape of the surface portion 37, which after its lifting the strap-like handle 35 forms. This surface portion 37 is formed here trapezoidal, wherein the base line is located on the wider side of the trapezoid. In addition to the dividing line 36, a weakening line 38 is entered here, which connects the end points of the baseline of the dividing line 36 to the edge 11 of the sealing disk 10. This weakening line 38 moreover goes symmetrically in an arc beyond the base line on the side remote from the surface section 37.

Again, the user on the side facing away from the base line of the dividing line 36 of the surface portion 37 lift the latter and pivot around the base line and thus set up perpendicular to the plane and thus perpendicular to the surface of the sealing washer 10. If the user then draws this tab-like handle 35, which has thus formed, further and exerts additional tensile force, in this case along the line of weakness 38, the sealing disc will tear as a whole and cut out the entire area between the lines of weakness 38. In this embodiment, an approximately triangular cutout is formed in the sealing disc 10, which forms a 60 ° angle and can be used, for example, as a drinking opening. The region of the sealing disc 10 outside the lines of weakness 38 remains on the mouth of the container. In the figure 7, a third embodiment is shown in a similar form as in Figures 5 and 6. In turn, one looks from above onto the reinforcing layer 30 and sees a parting line 36 which largely surrounds a surface section 37. Between the two end points of the dividing line 36, one can again think of a baseline. A user who acts on the dividing line 36, there turn turn the not connected to the underlying layers surface portion 37 to the baseline and set up perpendicular to the sheet plane and the surface of the sealing washer 10. The tab-like handle 35 resulting in this way in this exemplary embodiment is asymmetrical and allows a particularly interesting opening behavior when tensile force is exerted on the tab-like handle 35. It is In addition, a weakening line 38 is provided, which is drawn circularly symmetrical about the center of the sealing disc 10. If you pull now on the tab-like handle 35, the tensile force is transmitted to the base line adjacent side of the inner circle within the line of weakness 38 and then achieved an additional opening within the sealing disc 10 with further application of the tensile force.

FIG. 8 shows a fourth example of an embodiment of a sealing disk 10 according to the invention. Again, one looks from above onto the reinforcing layer 30 of a sealing disc 10. Here again, an approximately quadrangular shape of a surface portion 37 is indicated, which is surrounded on three sides by the parting line 36. Weakening lines start from the two end points of the base line and connect them to the one with the adjacent edge 1 1 of the sealing disc 10, while they run to the other circular as in the example of Figure 7, but not completely close.

If in this embodiment, the surface portion 37 is pivoted about the base line and placed perpendicular to the sheet plane or the surface of the sealing washer 10 and then exerted by a user a tensile force, so tears here the short portion of the line of weakness 38 to the edge 1 1 of the sealing washer 10 and the The entire outer edge of the sealing disc 10 can then be pulled off the weakening line 38 again spirally, so that the sealing disc 10 is applied directly and directly at the edge in the sealed area of the sealing layer 25 on the upper edge of the mouth of the container with force and dissolves successively.

The still standing inside area within the circular weakening line 38 can then be separated separately. Further embodiments of the shape of the surface portion 37 and the relative arrangement of the base line between the two end points of the parting line 36 relative to the edge 1 1 of the sealing disc 10 are conceivable. LIST OF REFERENCE NUMBERS

5 containers

6 screw cap

10 sealing washer

1 1 edge of the sealing disc

12 starting points at the edge of the sealing disc

20 Film for inductive coupling (metal foil) 25 Sealing layer

30 reinforcement layer

31 adhesion-reduced application or covering varnish

32 adhesive layer

35 handle

36 dividing line

37 area section

38 weakening line

40 layer on underside of screw cap (Reseal part)

Claims

claims

Sealing disc (10) for closing mouths of containers (5), the mouth having an edge and the sealing disc (10) having a mating edge (11),

with a foil (20) for the inductive coupling of heat into the sealing disc (10),

with a sealing layer (25) on the side of the film (20) facing the interior of the container (5) for sealingly sealing the sealing disk (10) on the edge of the mouth of the container (5),

with several layers (30) on the side of the film (20) facing away from the sealing layer (25),

with an adhesive layer (32) between two of the layers (30), and with a handle (35) formed as part of the sealing disc (10) for

Opening the mouth of the sealed with the sealing washer (10) container

(5)

wherein at least one of the layers (30) is provided on the side of the film (20) facing away from the sealing layer (25) with a parting line (36) for forming an outline of the handle (35),

characterized,

a surface portion (37) adjacent to the parting line (36) is constructed so that the adhesive layer (32) in said surface portion (37) has a reduced bond strength or is omitted or covered with a layer having an adhesion-reduced deposit (31), and

in that the dividing line (36) partially surrounds the surface section (37) to form a tab-shaped handle (35).

Sealing disc (10) according to claim 1,

characterized,

the adhesion-reduced coating (31) is a non-stick coating, in particular a polyamide coating or a polyester coating.

3. sealing washer (10) according to any one of the preceding claims,

characterized,

in that the adhesion-reduced application (31) has an application quantity of more than 1.0 g / m ² and less than 2 g / m ² , in particular more than 1.3 g / m ² and less than 1.5 g / m ² is applied.

4. sealing washer (10) according to any one of the preceding claims,

characterized,

in that one or more weakening lines (38) are subsequently provided at one or both ends of the parting line (36).

Sealing disc (10) according to one of the preceding claims,

characterized,

that the lines of weakness (38) form a connection between two starting points (12) at the edge (1 1) of the sealing disc (10) on the surface of the sealing disc (10) and the end points of the parting line (36), and

in that the surface section (37) lies on the convex side of the parting line (36) facing the starting points (12). 6. sealing washer (10) according to claim 5,

characterized,

that the sealing disc (10) is circular,

that the dividing line (36) forms a surface whose shape is similar to an isosceles triangle with an imaginary straight line between the two end points as a base, but is formed with a rounded tip, and

the surface portion (37) fills the rounded tip on the convex side of the parting line (36) symmetrically with respect to the bisector of the isosceles triangle. Sealing disc (10) according to one of the preceding claims,

characterized,

the dividing line (36) is formed by a perforation, in particular by a lasered perforation, and

that this perforation extends through all the layers (30) on the side of the film (20) facing away from the sealing layer (25), but not through the film (20) itself.

Sealing disc (10) according to one of the preceding claims,

characterized,

in that further layers (40) are provided and designed such that they seal the mouth of the container (5) tightly after the film (20) has been removed and the layers (40) have been replaced. 9. sealing washer (10) according to claim 8,

characterized,

in that the further layers (40) have a carrier layer of a foamed polymer or of cardboard. 10. sealing washer (10) according to claim 8 or 9,

characterized,

that the layers (40) on the side facing away from the sealing layer (25) side of the film (20) above the layer (30) with the parting line (36) manufacturer already after the filling and closing of the container (5) by means of thermal action of the layer (30) are dissolved, or

in that the layers (40) on the side of the film (20) facing away from the sealing layer (25) above the layer (30) with the parting line (36) are still produced by the manufacturer after the filling and closing operation of the container (5). 30) are connected and only loosen when first screwing a screw cap.

1 1. Container (5) with a mouth, which is closed by a sealing disc (10) according to one of the preceding claims.