阅读说明：本技术 密封膜 (Sealing film ) 是由 M·优希利-霍恩 于 2020-04-17 设计创作，主要内容包括：本发明涉及一种用于施加在基部(2)上的密封膜(1),其包括载体膜(3)和多个功能层(4),其中,功能层包括至少两个颜色呈现层(5、6)和至少两个控制粘附的层(8、9),其中,密封膜具有用于固定在基部上的粘接剂层(11),其中,功能层布置在载体膜与粘接剂层之间,其中,载体膜能够至少部分地从功能层脱离,其中,在第二状态下至少一个符号在视觉上是可见的,所述符号在第一状态下是不可见的,其中,在载体膜脱离时通过所述至少两个控制粘附的层能够将限定的区域从所述至少两个颜色呈现层分离出。提出,功能层包括至少一个另外的控制粘附的层(10),以便使得从载体膜朝着粘接剂层方向看至少一个处于所述另外的控制粘附的层之后的层(17)在第二状态下至少局部可见。(The invention relates to a sealing film (1) for application to a base (2), comprising a carrier film (3) and a plurality of functional layers (4), wherein the functional layers comprise at least two color-rendering layers (5, 6) and at least two adhesion-controlling layers (8, 9), wherein the sealing film has an adhesive layer (11) for fixing to the base, wherein the functional layers are arranged between the carrier film and the adhesive layer, wherein the carrier film can be at least partially detached from the functional layers, wherein in a second state at least one symbol is visually visible, which symbol is not visible in a first state, wherein a defined area can be separated from the at least two color-rendering layers by the at least two adhesion-controlling layers upon detachment of the carrier film. It is proposed that the functional layer comprises at least one further adhesion-controlling layer (10) in order to make at least one layer (17) located behind the further adhesion-controlling layer at least partially visible in the second state, as seen from the carrier film towards the adhesive layer.)

1. Sealing film (1) for application on a base (2), comprising a carrier film (3) and a plurality of functional layers (4), wherein the functional layers (4) comprise at least two color-rendering layers (5, 6) and at least two adhesion-controlling layers (8, 9), wherein the sealing film (1) has an adhesive layer (11) for fixing on the base (2), wherein the functional layers (4) are arranged between the carrier film (3) and the adhesive layer (11), wherein the carrier film (3) can be detached at least partially from the functional layers (4), in particular from the at least two color-rendering layers (5, 6), in order to bring the sealing film (1) from a first state (13) into a second state (14), wherein at least one symbol (12) is visually visible, the symbol (12) is not visible in the first state (13), wherein upon release of the carrier film (3) a defined area can be separated from the at least two color-rendering layers (5, 6) by the at least two adhesion-controlling layers (8, 9) in order to make the at least one symbol (12) visible, characterized in that the functional layer (4) comprises at least one further adhesion-controlling layer (10) in order to make at least one layer (17) behind the further adhesion-controlling layer (10) at least partially visible in the second state (14), seen from the carrier film (3) towards the adhesive layer (11).

2. Sealing film according to claim 1, characterized in that the layer (17) following the further adhesion-controlling layer (10) comprises at least one code (15) consisting of visual characters and/or graphic symbols.

3. Sealing film (1) according to claim 2, characterized in that the layer (17) behind the further adhesion-controlling layer (10) is at least partially transparent and is comprised by the functional layer (4), and that the functional layer (4) comprises at least one further color-rendering layer (7), the further color-rendering layer (7) being arranged between the layer (17) behind the further adhesion-controlling layer (10) and the adhesive layer (11).

4. Sealing film (1) according to claim 3, characterized in that at least the following functional layers (4) are applied in succession, preferably directly in succession, on the carrier film (3) as seen in the direction of the adhesive layer (11):

-a first layer (8) controlling adhesion,

-a first color-rendering layer (5),

-a second layer (9) controlling adhesion,

-a second color-rendering layer (6),

-the further adhesion-controlling layer (10),

-a layer (17) after the further adhesion-controlling layer (10), and

-the further color-rendering layer (7).

5. Sealing film (1) according to claim 1, characterized in that the layer (17) behind the further adhesion-controlling layer (10) and the adhesive layer (11) are at least partially transparent in order to make visible the code (15) on the base (2) in the second state (14).

6. Sealing film (1) according to claim 5, characterized in that at least the following functional layers (4) are applied in succession, preferably directly in succession, on the carrier film (3) as seen in the direction of the adhesive layer (11):

-a first layer (8) controlling adhesion,

-a first color-rendering layer (5),

-a second layer (9) controlling adhesion,

-a second color-rendering layer (6),

-the further adhesion-controlling layer (10), and

-a layer (17) after the further adhesion-controlling layer (10).

7. Sealing film (1) according to one of claims 4 or 6, characterized in that the first color-rendering layer (5) and the second color-rendering layer (6) are embodied in at least two different colors.

8. Sealing membrane (1) according to claim 7, characterized in that the at least one symbol (12) is constituted by at least one of the at least two colors in the second state (14).

9. Sealing film (1) according to claim 8, characterized in that in the second state (14) in the at least one symbol (12) at least one color is visually visible, which is visually invisible in an area (21) at least partially surrounding the at least one symbol (12) and/or vice versa.

10. Sealing film (1) according to one of claims 4 or 6, characterized in that the adhesion-controlling layer (8, 9, 10) is a release lacquer layer (8, 9, 10) which reduces the adhesion capability of the first color-rendering layer (5) and the second color-rendering layer (6) relative to the adjoining layers of the sealing film (1).

11. Sealing membrane (1) according to claim 10, characterized in that the release lacquer layer (8, 9, 10) comprises at least one silicone and/or at least one wax.

12. Sealing film (1) according to one of claims 1 to 11, characterized in that the carrier film (3) consists of a transparent plastic.

13. Sealing film (1) according to one of claims 1 to 12, characterized in that a tab (23) is provided which is connected directly or indirectly to the carrier film (3).

14. Sealing membrane (1) according to claim 13, characterized in that the tab (23) is constructed by a self-contained layer comprised by the functional layer (4).

Technical Field

The invention relates to a sealing film for application on a base, comprising a carrier film and a plurality of functional layers, wherein the functional layers comprise at least two color-rendering layers and at least two adhesion-controlling layers, wherein the sealing film has an adhesive layer for fixing to the base, wherein the functional layers are arranged between the carrier film and the adhesive layer, wherein the carrier film can be detached at least partially from the functional layers, in particular from the at least two color-rendering layers, in order to bring the sealing film from a first state into a second state, wherein in the second state at least one symbol is visually visible, which symbol is not visible in the first state, wherein upon detachment of the carrier film a defined area can be separated from the at least two color-rendering layers by the at least two adhesion-controlling layers, so as to make the at least one symbol visible.

Background

In addition to protecting the container or package from unauthorized opening, a sealing membrane may also be used to cover confidential information. The secret information may be, for example, a PIN code or a QR code, a hologram or an identification code. The confidential information is only visible to the viewer by peeling off the sealing film.

A disadvantage of conventional sealing membranes is that they can be easily and frequently handled. The sealing film, which is placed on the base, for example on paper or cardboard, can often be opened manually or by means of a tool, such as a knife, and then applied back again in its original position, so that the observer is not aware of the previous manipulation.

For this reason there are various sealing films which can be applied to the base by means of an adhesive layer, wherein the adhesive layer prevents detachment by hand or with a tool, such as a knife. By means of a precise separating force or adhesive capacity within the multilayer construction of the sealing film, such sealing films cannot be detached from the respective base without visible changes in their appearance. Often, a graphical symbol is revealed after detachment, which indicates that detachment has been performed.

AT009366U discloses a closure tag by means of which the occurrence of a single opening of a packaging element is univocally and irreversibly indicated. The closure label has a plurality of layers that are partially connected to one another, wherein an upper layer can be partially detached from a lower layer. By detaching the upper layer, defined regions of the coating layer, in particular of the color layer, arranged between the upper layer and the lower layer can be separated by means of at least one release lacquer layer. The graphical object previously hidden from the viewer in the marking area of the closure label is thereby visually visible, thereby univocally and irreversibly indicating that the packaging element has been opened once.

In the known closure labels, it is disadvantageous that only a relatively weak symbol is produced when the carrier film is detached from the further layer. This implies that there is a risk that the carrier film is applied back to the lower layer and that it is only difficult for the viewer to see whether the closure label has been detached, since the manipulated and non-manipulated closure labels are almost indistinguishable from each other. That is, such a closed tag is only conditionally suitable for masking secret information because the observer cannot determine whether the secret information was previously viewed by another person.

EP0974951B1 discloses labels for covering information, in particular passwords, which have an adhesive layer, a base layer and a color layer which can be irreversibly removed by friction. An authenticity feature is provided on the color layer, which is damaged or destroyed when the color layer is removed, so that it is immediately apparent whether a hand was previously placed on the color layer.

In the known labels, it is disadvantageous that additional production steps are required, since an additional color layer must be applied to the base layer, which is usually very thick in order to sufficiently cover the information.

Disclosure of Invention

The object of the present invention is therefore to provide a sealing membrane which overcomes the disadvantages of the prior art and makes the code visible, wherein particularly contrasting symbols appear when the carrier membrane is detached, whereby the previously manipulated sealing membrane is shown by a univocal indication of the open state, and which is simple and cost-effective to produce.

The object set forth at the outset is achieved for a sealing film for application to a base, comprising a carrier film and a plurality of functional layers, wherein the functional layers comprise at least two color-rendering layers and at least two adhesion-controlling layers, wherein the sealing film has an adhesive layer for fixing to the base, wherein the functional layers are arranged between the carrier film and the adhesive layer, wherein the carrier film can be detached at least partially from the functional layers, in particular from the at least two color-rendering layers, in order to bring the sealing film from a first state into a second state, wherein in the second state at least one symbol is visually visible, which symbol is not visible in the first state, wherein upon detachment of the carrier film a defined region can be separated from the at least two color-rendering layers by the at least two adhesion-controlling layers, in order to make the at least one symbol visible, the object is achieved according to the invention in that the functional layer comprises at least one further adhesion-controlling layer, so that at least one layer lying behind the further adhesion-controlling layer, viewed from the carrier film in the direction of the adhesive layer, is at least partially visible in the second state.

The structure of the sealing film according to the invention can be summarized as follows: applying a plurality of functional layers between the carrier film and the adhesive layer, wherein the functional layers comprise at least two color-rendering layers and at least two adhesion-controlling layers. At least one symbol appears during the detachment of the carrier film, wherein defined areas are separated from the at least two color-rendering layers by the at least two adhesion-controlling layers, which constitute the at least one symbol. That is to say that the at least one symbol remains hidden to the observer until the first opening of the sealing film according to the invention and is only visible visually after the opening has been completed.

In a second state, the sealing film according to the invention has a layer which is peeled off and a residue which remains adhered to the base. The at least one symbol may be visible on the layer being peeled off and/or on the remnant in the second state.

Of course, the separate defined regions of the at least one color representation layer need not be attached directly to the carrier film or adhesive layer here, but rather the defined regions can also be attached indirectly via further functional layers arranged on the carrier film or adhesive layer.

Furthermore, the sealing film according to the invention comprises a further adhesion-controlling layer which, during the detachment of the carrier film, makes at least part of the layer which is situated behind the further adhesion-controlling layer, as seen from the carrier film in the direction of the adhesive layer, visible. That is to say that the layer lying behind the further adhesion-controlling layer is not visible in the first state and is at least partially visible only after the carrier layer has been detached, i.e. is at least partially visible in the second state.

The sealing foil according to the invention can, of course, in addition to the described functional layers also have any desired number of further functional layers which have in a targeted manner the advantages of the production technology or the visual effect without departing from the concept according to the invention.

By means of the functional layer, for example, visually perceptible objects, for example, colors or codes, or an effect, for example, by means of the adhesion-controlling layer, are produced. That is to say "functional layer" is a generic term for, for example, a color-rendering layer, an adhesion-controlling layer and a layer lying behind the further adhesion-controlling layer.

The color rendering layer may in turn comprise a plurality of build layers. That is, the color presentation layer includes one or more build layers, depending on the color of the color presentation layer. A color-rendering layer, for example dark gray, typically comprises a white build-up layer and a black build-up layer, based on the printing process that takes place in practice.

It is conceivable that the functional layers are preferably applied one after the other in a flexographic, screen printing, letterpress, lithographic or digital printing process.

By releasing the carrier film, the code is revealed or visible. The code can here be located directly on the packaging and/or be part of the sealing film, preferably part of the functional layer and/or part of the adhesive layer arranged between the carrier film and the adhesive layer.

In order to make the code hardly, preferably not, visible, at least one of the color representation layers may be opaque or contain interference patterns or the code may not be visually prominent for other reasons.

It is envisaged that the at least two colour presentation layers have different colours.

Of course, the at least two color-rendering layers may also have the same color, respectively. In this case, the at least one symbol may also be visible in the second state, because the light refraction of the parts of the color-rendering layer that are separated during detachment by means of the adhesion-reducing layer changes.

The color rendering layer may be opaque, semi-opaque, translucent, or transparent.

Furthermore, it is conceivable for the at least two color-rendering layers to each be composed locally of different colors, which may be, for example, stripe-shaped or grid-shaped or arranged in the form of an image and/or pattern.

It should be mentioned that the functional layer does not necessarily have to extend over the entire surface, i.e. over the entire surface, of the sealing film according to the invention. In other words, it is conceivable for a part of the functional layer to be arranged only partially on the side of the sealing foil according to the invention.

In a preferred embodiment of the sealing film according to the invention, it is provided that the layer following the further adhesion-controlling layer comprises at least one code, which is formed by visual characters and/or graphic symbols. The code is thus also invisible in the first state and only visible after detachment of the carrier layer, i.e. in the second state. That is to say the code is covered by the at least two color representation layers in the first state in such a way that the code lying below the at least two color representation layers is barely visible, preferably not visible. To this end, at least one of the color-rendering layers may be opaque or contain an interference pattern or the code may not be visually prominent for other reasons.

The layer following the further adhesion-controlling layer is in the preferred embodiment a code-presenting layer.

The code typically contains secret information. The code may be, for example, a PIN code or a QR code, a hologram or an identification code.

Particularly preferably, in the sealing film according to the invention, it is provided that the layer lying behind the further adhesion-controlling layer is at least partially transparent and is comprised by the functional layer, and that the functional layer comprises at least one further color-rendering layer which is arranged between the layer lying behind the further adhesion-controlling layer and the adhesive layer. The further color-rendering layer thus follows the layer following the further adhesion-controlling layer, viewed from the carrier film towards the adhesive layer.

The functional layer thus comprises in this particularly preferred embodiment at least in part the code. That is to say the code is at least partially part of a sealing film according to the invention.

The further color rendering layer has the following tasks on the one hand: the code is made readable. That is to say that preferably the color of the further color-rendering layer and the color of the code have a high contrast, whereby the code is clearly visible on the further color-rendering layer which is situated behind, as seen from the carrier film towards the adhesive layer.

On the other hand, the additional color-rendering layer can serve as a visual protection in the event that the sealing film according to the invention, including all functional layers, is removed from the base part without regulation, for example by means of a tool. That is to say that the code is not readable in such a case by the further color-rendering layer and is masked on the rear side by the further color-rendering layer.

Furthermore, it is possible that the further color-rendering layer serves as a protection against visibility in the case of a sealing film according to the invention applied on a transparent base, for example on a glass bottle. In this case, the code (although the base is transparent) is still unreadable, since the further color-rendering layer covers the code on the rear side.

Preferably, the further color-rendering layer fulfils both of the above-mentioned tasks. It is envisaged that the further colour rendering layer is opaque. It is however also possible that the further color-rendering layer is at least partially transparent or translucent.

In a particularly preferred embodiment of the sealing film according to the invention, it is provided that at least the following functional layers are applied, preferably directly, in succession on the carrier film, viewed in the direction of the adhesive layer:

-a first layer for controlling the adhesion,

-a first color-rendering layer,

-a second layer for controlling the adhesion,

-a second color-rendering layer,

-a further adhesion-controlling layer,

-a layer after the further adhesion-controlling layer, and

-said further color-rendering layer.

In a practical test field, this arrangement of successively applied functional layers proves to produce, in the second state, on the one hand, a particularly strong visual contrast in the case of the at least one symbol and, on the other hand, to protect as well as possible the layers comprising the code that follow the further adhesion-controlling layer.

It is of course conceivable that at least one further functional layer is present in addition to the functional layers listed above.

Furthermore, it is conceivable that the code is on the base. In order to make the code on the base visible in the second state, it is possible that the adhesive layer is not applied over the entire face of the sealing film according to the invention, i.e. not over the entire face, and that a section is left empty in which the code on the base should be visible in the second state. That is to say the adhesive layer is in this case arranged only partially below the functional layer. In this way, additional adhesion-controlling layers can be dispensed with in sections where no adhesive layer is present. That is to say that the further adhesion-controlling layer can also be present in this case only locally. Of course, the possibility is not excluded that the layer following the further adhesion-control layer may also be present only locally.

If the code is on the base and the adhesive layer is arranged locally so that the code is visible in the second state, the sealing membrane according to the invention must be arranged very precisely on the base, so that it can be ensured that no section of the adhesive layer actually lies on the code on the base. In order that the sealing film according to the invention does not have to be arranged too precisely, it is preferably provided in the sealing film according to the invention that the layer following the further adhesion-controlling layer and the adhesive layer are at least partially transparent in order to make the code on the base visible in the second state.

The code is preferably on a base, for example on paper, cardboard or a packaging element, and is covered by a sealing film in the first state. That is to say that in this preferred embodiment the code is also invisible in the first state and is visible only after detachment of the carrier layer, i.e. in the second state.

It is also conceivable, however, for the adhesive layer to comprise the code at least in part.

Preferably, the code is a PIN code or a QR code, a hologram or an identification code as described above.

In order to make the code hardly visible, preferably not visible, at least one of the color representation layers may be opaque or contain interference patterns or the code underneath it may be visually unobtrusive for other reasons.

In this case, however, the possibility is not excluded that at least a part of the code may also be located in or on one of the functional layers, preferably on a layer following the further adhesion-control layer. That is to say at least a part of the code is on the base and at least a part of the code is in or on one of the functional layers.

In a particularly preferred embodiment of the sealing film according to the invention, it is provided that at least the following functional layers are applied, preferably directly, in succession on the carrier film, viewed in the direction of the adhesive layer:

-a first layer for controlling the adhesion,

-a first color-rendering layer,

-a second layer for controlling the adhesion,

-a second color-rendering layer,

-said further adhesion-controlling layer, and

-a layer following the further adhesion-controlling layer.

In a practical test field, such an arrangement of successively applied functional layers has proven to produce, in the second state, on the one hand, a particularly strong visual contrast in the case of the at least one symbol and, on the other hand, to protect the code on the base and/or in the adhesive layer as well as possible.

The layer following the further adhesion-controlling layer ensures the action of the further adhesion-controlling layer, since it is thereby ensured that the adhesion-controlling layer does not come into direct contact with the adhesive layer.

It is of course conceivable that at least one further functional layer is present in addition to the functional layers listed above.

In a preferred embodiment of the sealing film according to the invention, it is provided that the first color-rendering layer and the second color-rendering layer are embodied in at least two different colors.

Preferably, the at least two different colors have a very high contrast.

Black and white are also considered as colors within the scope of the present invention.

It is conceivable that both the first color representation layer and the second color representation layer each consist partially of different colors, which are arranged, for example, in stripes.

Of course, the first color-rendering layer and the second color-rendering layer may also each contain only one color, wherein the color of the first color-rendering layer is different from the color of the second color-rendering layer.

Furthermore, as already described above, the two color representation layers can also be composed of the same color.

Furthermore, it is conceivable that the first color-rendering layer is composed of two different colors, for example black and white, and the second color-rendering layer is composed of two different colors, for example white and black, i.e. for example a striped or checkerboard arrangement involving the two different colors. The two different colors of the first color-rendering layer are arranged differently, e.g. diametrically, than the two different colors of the second color-rendering layer.

In a preferred embodiment of the sealing film according to the invention, it is provided that the at least one symbol in the second state is formed by at least one of the at least two colors. The at least one symbol is thereby visible in one of the at least two colors of the first and second color-rendering layers or in a mixed color of the at least two colors of the first and second color-rendering layers.

The mixed color results, for example, from two superposed color-rendering layers, wherein the overlying color-rendering layer may not be opaque anyway. That is to say, for example, when one of the two superposed color-rendering layers is blue and the other of the two superposed color-rendering layers is red, a mixed color of violet is obtained.

Preferably, in the sealing film according to the invention, it is provided that in the second state at least one color is visually visible in the at least one symbol, which is visually invisible in the region at least partially surrounding the at least one symbol and/or vice versa.

That is to say that in the at least one symbol and in the area at least partially surrounding the at least one symbol, the different color is visually visible in the second state.

In particular, the following are conceivable:

a) in the at least one symbol, one of the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is visually visible in the second state. In the region at least partially surrounding the at least one symbol, the other of the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is accordingly visually visible in the second state.

b) In the at least one symbol, one of the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is visually visible in the second state. In a region at least partially surrounding the at least one symbol, a mixed color consisting of the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer in the second state is visually visible.

c) In the at least one symbol, the mixed color is visually visible in the second state. In an area at least partially surrounding the at least one symbol, one of the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is visually visible in the second state.

d) The at least one symbol is transparent in the second state. In a region at least partially surrounding the at least one symbol, one of the mixed color or the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is visually visible in the second state.

e) The area at least partially surrounding the at least one symbol is transparent in the second state. In the at least one symbol, one of the mixed color or the at least one color of the first color-rendering layer and the at least one color of the second color-rendering layer is visually visible in the second state.

The colors are separated in different combinations by the detachment of the carrier film and the symbols are revealed, whereby the visual inability to see the carrier film sticking back to the underlying layer and the unambiguous knowledge of whether the sealing film has been manipulated even in the case of a layperson inspection of the sealing film is virtually avoided.

In a particularly preferred embodiment of the sealing film according to the invention, it is provided that the adhesion-controlling layer is a release lacquer layer which reduces the adhesion capability of the first color-rendering layer and the second color-rendering layer relative to the adjoining layer of the sealing film. The adhesion-control layers include an adhesion-control first layer, an adhesion-control second layer, and an additional adhesion-control layer. The term "contiguous layers" includes functional layers as well as carrier layers.

In the case of defined regions of the first and second color-rendering layers, a lower adhesive capacity results relative to the regions excluded by the defined regions, in that the release lacquer layer adjoins the first and second color-rendering layers, respectively, whereby the two color-rendering layers are not permanently connected, in a manner known per se, to a further functional layer adjoining the release lacquer layer, in particular not to the carrier layer, in the defined regions of lesser adhesive capacity, and thus remain readily detachable. Accordingly, due to this arrangement, the regions of the layers adjoining one another, which are excluded by the defined regions, can be permanently connected to one another.

However, it is also conceivable for the adhesion-controlling layer to be a layer which increases the adhesion capability of the first color-rendering layer and the second color-rendering layer relative to the adjoining layer of the sealing film. The mode of action is exactly the opposite of that described above.

The release lacquer layer is preferably translucent, particularly preferably transparent.

Preferably, provision is made in the sealing film according to the invention for the release lacquer layer to comprise at least one silicone and/or at least one wax.

The adhesion capability of the functional layer or carrier film or base part adjoining the release lacquer layer is thereby reduced in a manner known per se by means of the release lacquer layer to a precisely designed extent, so that adjoining functional layers can adhere to a reduced extent. The extent of the reduction in the adhesive capacity can be controlled, in particular, by the selection of the release lacquer, by the layer thickness and/or by the concentration of the at least one silicone and/or the at least one wax in the release lacquer layer.

In a preferred embodiment of the sealing film according to the invention, it is provided that the carrier film is made of a transparent plastic. By means of the transparent design of the plastic, the at least two underlying color representation layers are at all times well visible and it can be seen whether the at least two color representation layers are evenly distributed and thus not touched, or whether already defined regions in the form of graphic symbols are separated from the face of the at least one color representation layer and thus manipulation of the sealing film according to the invention has taken place.

Preferably, a tab is provided in the sealing film according to the invention, which tab is connected directly or indirectly to the carrier film. In other words, the sealing film according to the invention has tabs which are also connected to the carrier layer in the second state, but not to the adhesive layer, in the sense of improved handling comfort.

The tabs are used to grasp the sealing membrane according to the invention.

The tab is for example an integral part of the carrier layer, but may also be a separate component which is attached to the carrier film by suitable means, such as welding or gluing.

It is also possible for the tab to be an integral part of one of the functional layers or to be attached to one of the functional layers by suitable methods, such as welding or adhesive bonding.

It is conceivable to print an indicator in the region of the tab, which indicates to the user the area on which the sealing film according to the invention is to be grasped for removal.

In a preferred embodiment of the sealing foil according to the invention, it is provided that the tab is formed by a separate layer, which is comprised by the functional layer.

The tabs are arranged in the functional layer, preferably not all the way through the functional layer. In other words, the at least one symbol is preferably formed in the region next to the web when the sealing membrane according to the invention is transferred from the first state into the second state.

It is also conceivable that an adhesive layer, for example a laminating adhesive layer, is part of the functional layer, which adhesive layer is not applied over the entire surface. For example, the adhesive layer may not be applied in the region of one corner of the sealing film according to the invention, as a result of which the carrier film can be detached particularly well from the functional layer in this corner and thus assumes the function of a tab.

Drawings

The invention will now be illustrated in detail by means of examples. The drawings are exemplary and, although the inventive concept should be elucidated, they are by no means limiting or are by no means exhaustive.

In the drawings:

FIG. 1 shows a schematic view of the structural configuration of a first embodiment of a sealing membrane according to the invention, with codes within the functional layer;

FIG. 2 shows a schematic view of the structural configuration of a second embodiment of a sealing membrane according to the invention, having a code on the base;

fig. 3a) shows a schematic view of the first or second embodiment in a first state;

fig. 3b) shows a schematic illustration of the detached layer of the first or second embodiment in a second state after opening as specified;

fig. 3c) shows a schematic illustration of the remnant of the first or second embodiment on the base in the second state after opening as specified;

fig. 3d) shows a schematic illustration of the application of the removed layer of the first or second embodiment which is stuck back to the residual in the second state after the predetermined opening;

FIG. 4 shows a schematic view of the structural configuration of a third embodiment of a sealing membrane according to the invention, with codes within the functional layer;

fig. 5a) shows a schematic view of the third embodiment in a first state;

fig. 5b) shows a schematic view of the uncovered layer of the third embodiment in the second state after opening as specified;

fig. 5c) shows a schematic illustration of a residual part of the third embodiment on the base in the second state after opening as specified;

fig. 5d) shows a schematic illustration of the application of the removed layer adhering back to the residual in the second state after the predetermined opening;

fig. 5e) shows a schematic view of the uncovered layer of the third embodiment in the second state after the non-regular opening;

FIG. 5f) shows a schematic view of the remnant of the third embodiment on the base in the second state after opening out of specification, an

Fig. 5g) shows a schematic illustration of the application of the removed layer which has been glued back to the residual after the non-proper opening in the second state.

Detailed Description

Fig. 1 shows a schematic illustration of the structural design of a sealing film 1 according to the invention, which has a code 15 in the functional layer 4. The sealing membrane 1 according to the invention shown in fig. 1 corresponds to the first exemplary embodiment.

It is to be mentioned that black and white are also to be regarded as colors within the scope of the invention.

The first layer of the sealing film 1 according to the invention, viewed in the first direction 16, is a carrier film 3, which is made of a transparent plastic film, preferably made of polypropylene or polyethylene terephthalate. The plastic film may be matte or glossy. It is furthermore conceivable that the plastic film is colored, but not opaque.

The last layer of the sealing film 1 according to the invention, seen in the first direction 16, is an adhesive layer 11 which can be adhered to the base 2, wherein the base 2 can be, for example, a piece of paper or cardboard. That is to say that the sealing film 1 according to the invention, which is applied to the base 2 by means of the adhesive layer 11, can only be detached from the base 2 in the event of a violent force being used and remains partially on the base 2 even during the detachment process of the sealing film 1 described below. The portion of the sealing film 1 according to the invention remaining on the base 2 is referred to as the residual 19. The self-adhesive function of the adhesive layer 11 can be protected, for example, by a film which is removed before the sealing film 1 is applied or placed on the base 2. In order to ensure a firm connection with the surface of the base 2, a correspondingly strong adhesive material, for example an adhesive cement, must be used. The adhesive may be acrylic-based or rubber-based and the adhesive may be, for example, dispersed, dissolved in a solvent or applied as a hot melt.

Alternatively, a heat-seal adhesive may also be used for establishing a firm connection between the sealing film 1 and the surface of the base 2.

The following functional layers 4 are arranged between the carrier film 3 and the adhesive layer 11.

The first color-rendering layer 5 is behind the carrier film 3, seen in the first direction 16, and remains in the color of white F2 in this embodiment. But in principle the colour can be chosen arbitrarily.

Between the carrier film 3 and the first color-rendering layer 5, an adhesion-controlling first layer 8 is arranged, which in the embodiment shown is a first release lacquer layer 8, which comprises at least one silicone and/or at least one wax.

It should be noted that alternative material mixtures can also be used as release lacquer layers 8, 9, 10. It is important in this case, however, that the release lacquer layers 8, 9, 10 have suitable adhesion-reducing properties in the exemplary embodiment shown, in order to reduce the adhesion capability of the layer (functional layer 4 or carrier film 3) to which the respective release lacquer layer 8, 9, 10 is applied to a precisely designed degree, so that adjoining layers adhere or can adhere to a reduced degree.

Behind the first color-rendering layer 5, viewed in the first direction 16, a second color-rendering layer 6 is arranged, which in this embodiment is black F4. The color of the second color-rendering layer 6 may be arbitrarily selected. Preferably, the first color representation layer 5 and the second color representation layer 6 comprise contrasting colors, so that at least one contrasting symbol 12 is produced in the case of a corresponding arrangement of the functional layer 4 during the detachment process.

Between the first color-rendering layer 5 and the second color-rendering layer 6, an adhesion-controlling second layer 9 is arranged, which in the embodiment shown is a second release lacquer layer 9, which comprises at least one silicone and/or at least one wax.

In the embodiment of fig. 1 and 2, a further adhesion-controlling layer 10 (which in the illustrated embodiment is a further release lacquer layer 10 comprising at least one silicone and/or at least one wax) and a layer 17 behind the further adhesion-controlling layer 10 are arranged behind the second color-rendering layer 6, seen in the first direction 16. The layer 17 behind the further layer 10 controlling adhesion is transparent and comprises a code 15. In the embodiment shown in fig. 1, 2 and 3c, the code 15 is a combination of numbers made up of black text. It is also conceivable, however, for the code 15 to be a QR code (see fig. 4), a graphic symbol or the like.

The code 15 is not visible in the first state 13 of the sealing foil 1 and is visible only after the carrier foil 3 has been detached, i.e. in the second state 14 of the sealing foil 1. The transition from the first state 13 to the second state 14 thus corresponds to the above-mentioned detachment process.

A further color-rendering layer 7, which in the embodiment of fig. 1 is white F2, is arranged, viewed in the first direction 16, behind the layer 17 behind the further adhesion-control layer 10. However, other colors are also conceivable, wherein a color is preferably selected which has a high contrast with the color of the code 15. This ensures that the code 15 is readable even with unfavorable visibility. That is to say on the one hand the further color rendering layer 7 has the task of making the code 15 readable. On the other hand, the further color-rendering layer 7 also serves as a visual protection against the code 15 if the sealing film 1 according to the invention, including all functional layers 4, is removed from the base 2 without regulation, for example by means of a tool. If the further color-rendering layer 7 is sufficiently opaque, i.e. opaque or almost opaque, the code 15 is also not transparent through the further color-rendering layer 7 and thus also not visible through the rear side of the sealing film 1 according to the invention, i.e. through the further color-rendering layer 7.

The functional layer 4 in this exemplary embodiment thus comprises, viewed in the first direction 16, a first release lacquer layer 8, a first color representation layer 5, a second release lacquer layer 9, a second color representation layer 6, the further release lacquer layer 10, a layer 17 following the further release lacquer layer 10 and the further color representation layer 7.

A second embodiment of a sealing membrane 1 according to the invention is disclosed in fig. 2. Fig. 2 shows a schematic illustration of the structural configuration of a second embodiment of a sealing membrane 1 according to the invention, which has a code 15 on the base 2.

The sealing membrane 1 according to the invention is constructed in fig. 2 in the same way as in fig. 1, except for the following unique differences: the layer 17 following the further release lacquer layer 10 does not contain the code 15. In this embodiment, the code 15 is located on the base 2 and is not part of the functional layer 4. The code 15 is covered in the first state 13 by the sealing foil 1 according to the invention. In other words, in this exemplary embodiment, the code 15 is also not visible in the first state 13 and is only visible after the carrier film 3 has been detached, i.e. in the second state 14.

Both adhesive layer 11 and layer 17 behind the further adhesion-control layer 10 are transparent at least in the region of code 15, in order to make code 15 on base 2 visible in second position 14. In this embodiment the further color-rendering layer 7 is dispensed with.

The layer 17 downstream of the further release lacquer layer 10 ensures in this exemplary embodiment the action of the further release lacquer layer 10, since the further release lacquer layer 10 does not come into direct contact with the adhesive layer 11, as is ensured by the layer 17 downstream of the further release lacquer layer 10.

Furthermore, in both illustrated embodiments (see fig. 1 and 2), it is conceivable for the sealing foil 1 according to the invention to have a tab (not shown) which is connected to the carrier foil 3. The tab facilitates the user in removing the carrier film 3 or in changing the sealing film 1 according to the invention from the first state 13 into the second state 14.

Fig. 3a) to d) show exemplary sealing films 1 according to the invention in a first state 13 (fig. 3a)) and in a second state 14 (fig. 3b) to 3d)) after opening as intended. Fig. 3a) to d) in this case cover both the first exemplary embodiment in fig. 1 and the second exemplary embodiment in fig. 2. It is not different from the illustrations in fig. 3a) to d) whether the coding 15 is located on the layer 17 following the further release lacquer layer 10 and is thus part of the functional layer 4 or whether the coding 15 is arranged on the base 2.

Fig. 3a) shows a schematic view of a sealing film 1 according to the invention in a first state 13. The sealing film 1 according to the invention is adhered to the base 2, for example white F2, by means of an adhesive layer 11 and is closed, i.e. it has not previously been manipulated. In the first state 13, the entire sealing foil 1 according to the invention is, for example, dark gray F1. The dark grey colour F1 is produced in the example shown by the close contact of the first colour-rendering layer 5 of white F2 with the second colour-rendering layer 6 of black F4.

It is of course conceivable for the sealing film 1 according to the invention to have other colors and color combinations in the first state 13 and also in the second state 14.

Fig. 3b) discloses a schematic view of the removed layer 18 in the second state 14 after opening as specified. The peeled-off layer 18 is the carrier film 3 including the colour-rendering layers 5, 6 attached to the carrier film 3.

Fig. 3c) shows a schematic illustration of the residual section 19 on the base 2 in the second state 14 after opening as intended. The residual portion 19 is the portion of the functional layer 4 that remains on the base 2.

In the second state 14, the two symbols 12 are now visually visible in two outer regions 20 lying opposite one another, wherein the two symbols 12 are produced when the carrier film 3 is detached by means of the release lacquer layer 8, 9, which separates the defined regions from the two color-rendering layers 5, 6.

The first release lacquer layer 8 ensures that the colour-rendering layers 5, 6 remain on the remnants 19 in the region 21 surrounding the two symbols 12. Correspondingly, the two regions 21 surrounding the symbol 12 are dark gray F1 on the residual part 19 and transparent F3 on the removed layer 18.

The second release lacquer layer 9 separates the first color representation layer 5 and the second color representation layer 6 and is responsible for the color formation of the two symbols 12. Thus, the symbol 12 is white F2 on the uncovered layer 18 and black F4 on the remainder.

The reference sign 12 is embodied in the exemplary embodiment of fig. 1, 2, 3 and 4, in particular in the shape of an "X". But it is of course possible that the symbol 12 has every arbitrary shape.

The further release lacquer layer 10 is responsible for making the code 15 visible. As already described above, it is not important for the code 15 to be visible whether the code 15 is arranged according to fig. 1 on the layer 17 behind the further release lacquer layer 10 or whether the code 15 is arranged according to fig. 2 on the base 2 below the adhesive layer 11.

All layers which, viewed in the first direction 16, precede the further release lacquer layer 10 are detached from the further release lacquer layer 10 in the region in which the further release lacquer layer 10 is applied by means of the carrier film 3. The code 15, which in the illustrated embodiment is located in the center region of the sealing film 1 according to the invention, is thus visible on the residual 19. By the white F2 design of the further color-rendering layer 7 or the base 2, a strong contrast is created between the code 15 (the characters of which are usually embodied in black F4) and the further color-rendering layer 7 or the base 2, whereby the code 15 is well visible. Correspondingly, that middle area on the removed layer 18 is dark gray F1.

Fig. 3d) shows a schematic illustration of the adhesive 22 of the removed layer 18 adhering back to the residual section 19 in the second state 14 after the predetermined opening. It can be seen that the symbol 12 is visible even after the removed layer 18 has been applied back 22 to the remnant 19. In other words, the manipulation of the sealing foil 1 according to the invention before the application of the closure 22 is indicated by a univocal indication of the open state in such a way that the symbol 12 is visible even after the application of the closure 22.

The regions that are superimposed after the application of the adhesive 22 do not produce a strong mixed color, since no intimate contact is produced between the color-rendering layers 5, 6 after the application of the adhesive 22. By detaching the carrier film 3, including the color-rendering layers 5, 6 attached to the carrier film 3, a rough surface is created between the peeled-off layer 18 and the residual part 19. After the adhesive 22 is applied back, it is thus not possible to establish a tight contact between the removed layer 18 and the residual part 19, as described above. That is to say that the different pigments are no longer strongly bonded. In addition, air collects between the removed layer 18 and the residual part 19 during the application 22, which air can no longer escape completely after the application 22, thereby also negatively influencing the color mixture.

The symbol 12 continues to be white F2 after the removed layer 18 is applied back 22 to the residue 19 because the symbol 12 on the removed layer 18 is white F2 and covers the black color F4 of the symbol 12 on the residue 19 when applied back 22.

Since the dark gray F1 region 21 of the remnant 19 is covered by the transparent F3 region 21 of the layer 18 being peeled off, the dark gray F1 region 21 of the remnant 18 is slightly highlighted, so that the region 21 appears gray F5 after being affixed back to 22.

The middle area where the code 15 is arranged after the attachment back 22 appears dark gray F1, because the color of dark gray F1 of the layer 18 being removed completely hides the code 15.

By making the two symbols 12 visible even after the application of the sticker 22, the observer immediately sees that the sealing film 1 according to the invention has been opened previously and that the code 15 may be seen by others.

Fig. 4 shows a schematic illustration of the structural design of a third exemplary embodiment of a sealing film 1 according to the invention, which has a code 15 in the functional layer 4.

The first layer of the sealing foil 1 according to the invention, viewed in the first direction 16, is a covering colour portion 24 which serves to identify the region of the code 15 and the region of the web 23 and additionally to cover the code 15. The carrier film 3 is located behind the color masking section 24, as viewed in the first direction 16, in this exemplary embodiment and is formed from a transparent plastic film.

The last layer of the sealing film according to the invention, seen in the first direction 16, is an adhesive layer 11 which can be adhered to the base 2. The following functional layers 4 are arranged between the carrier film 3 and the adhesive layer 11.

The laminating adhesive layer 25 is located directly behind the carrier film 3, as viewed in the first direction 16, and in this exemplary embodiment serves to leave free the tab 23 in order to enable simple removal. The laminating adhesive layer 25 is not applied over the entire surface, but no laminating adhesive layer 25 is applied at one corner of the sealing film 1 according to the invention, as a result of which the carrier film 3 can be detached particularly well there.

The first color-rendering layer 5 is behind the carrier film 3, seen in the first direction 16. Between the carrier film 3 and the first color-rendering layer 5, a first release lacquer layer 8 is arranged, which comprises at least one silicone and/or at least one wax.

Behind the first color-rendering layer 5, viewed in the first direction 16, a second carrier film 3 is arranged. A second release lacquer layer 9 is arranged between the first color-rendering layer 5 and the second carrier film 3.

By means of the functional layer 4 arranged between the carrier film 3 and the second carrier film 3, two symbols 12 in the shape of two "X" (see fig. 5b), 5c) and 5d) can be seen in the second state 14 after a defined opening.

The further release lacquer layer 10 and the layer 17 lying behind the further release lacquer layer 10 are arranged, as seen in the first direction 16, behind the second carrier film 3. The layer 17 behind the further release lacquer layer 10 is transparent and comprises the code 15. In this embodiment, the code 15 is a QR code.

Directly behind the layer 17 which is situated behind the further release lacquer layer 10, the second colour representation layer 6 is arranged, seen in the first direction 16.

Directly behind the second color-rendering layer 6, viewed in the first direction 16, an additional release lacquer layer 10 is arranged.

The further color-rendering layer 7 is arranged after the additional release lacquer layer 10.

By means of the functional layer 4 between the second carrier film 3 and the adhesive layer 11, two symbols 12' are visible in the second state even after an unscheduled opening, the symbols in the form of two "exclamation marks" in the embodiment shown (see fig. 5e), fig. 5f) and fig. 5 g)). That is to say if the sealing foil 1 according to the invention is not removed from the base as intended, for example by means of a tool, the two symbols 12' can be seen in this embodiment (as well as after the intended opening).

Fig. 5a) shows a schematic view of the third embodiment in the first state 13. The sealing membrane 1 according to the invention is bonded to the base 2 by means of an adhesive layer 11 and is closed. The sealing membrane has not previously been manipulated and therefore no symbol 12 is visible.

Fig. 5b) shows a schematic illustration of the removed layer 18 of the third exemplary embodiment in the second state 14 after opening as specified. The peeled off layer 18 is the carrier film 3 including the hiding color portion 24 attached to the carrier film 3 and the attached portion of the first color-rendering layer 5.

Fig. 5c) shows a schematic illustration of the residual section 19 of the third exemplary embodiment on the base 2 in the second state 14 after opening as intended. The residual part 19 is a part of the functional layer 4 remaining on the base 2 including the adhesive layer 11.

In the second state 14, the two symbols 12 are visually visible in the shape of two "xs" after being opened as specified.

Fig. 5d) shows a schematic illustration of the adhesive 22 of the removed layer 18 adhering back to the residual section 19 in the second state 14 after the predetermined opening. It can be seen that the symbol 12 is visible even after the removed layer 18 has been applied back 22 to the remnant 19. In other words, the manipulation of the sealing foil 1 according to the invention before the application of the closure 22 is indicated by a univocal indication of the open state in such a way that the symbol 12 is visible even after the application of the closure 22.

Fig. 5e) shows a schematic illustration of the uncovered layer 18 of the third embodiment in the second state 14 after the non-proper opening. The uncovered 10 layers 18 are in this embodiment parts of the carrier film 3, including the hiding color part 24 attached to the carrier film 3 and the functional layer 4 arranged between the carrier film 3 and the second carrier film 3, and the second color-rendering layer 6.

In the second state 14 after being opened out of specification, the two symbols 12' are visually visible in the shape of two "exclamation marks". As already mentioned above, the improper opening of the sealing film 1 according to the invention in this exemplary embodiment is also immediately visible to the observer.

Fig. 5f) shows a schematic illustration of the residual section 19 of the third embodiment on the base 2 in the second state 14 after the non-proper opening. The residual part 19 is a part of the functional layer 4 remaining on the base 2 included in the adhesive layer 11.

Fig. 5g) shows a schematic illustration of the adhesive 22 of the removed layer 18 which has been glued back to the residual 19 in the second state 14 after the non-proper opening. It can be seen that the symbol 12' is visible even after the removed layer 18 has been applied back 22 to the remnant 19. In this exemplary embodiment, the manipulation of the sealing membrane 1 according to the invention before the application of the seal 22 is indicated by a univocal marking in the non-properly opened state in such a way that the symbol 12' is visible even after the application of the seal 22.

List of reference numerals

1 sealing film

2 base part

3 support layer

4 functional layer

5 first color-rendering layer

6 second color-rendering layer

7 additional color-rendering layers

8 first layer or first release lacquer layer for controlling adhesion

9 controlled adhesion second layer or second release paint layer

10 additional adhesion-controlling layer or additional release lacquer layer

11 adhesive layer

12, 12' symbol

13 first state

14 second state

15 code

16 first direction

17 after the further adhesion-controlling layer or after the further release lacquer layer

18 layer to be peeled off

19 residual part

20 outer zone

21 region surrounding the symbol

22 paste back

23 contact piece

24 masking the color part

25 laminating adhesive layer

F1 dark gray

F2 white color

F3 transparent

F4 Black

F5 Gray