DE102005043221A1 - self-adhesive tape - Google Patents

Abstract

A self-adhesive tape (100) with a backing layer (10) and an adhesive layer (11) is disclosed, a portion of a primer layer (12) being applied to the backing layer (10) in order to identify an unauthorized opening of a package sealed with the self-adhesive tape (100) and a separating layer (13) is arranged over the entire area between the adhesive layer (11) and the primer layer (12) or carrier layer (10).

Description

The The invention relates to a self-adhesive tape having an adhesive layer.

such self-adhesive tapes for example, from this suitable plastic materials are those skilled in various embodiments known and common. Among other things, they are used for packaging or gluing packaging worthy of protection Products used. Among other things, a cardboard box or a Cardboard with such a self-adhesive tape in per se known Be sealed and closed in order to package the package e.g. by post to be able to send.

there the self-adhesive tape can be designed as a security adhesive tape, to tamper with after removing from the packaging to be able to recognize this. For this purpose, a multi-layered self-adhesive tape a defined adhesive strength between two layers in order to remove the self-adhesive tape here to create a splitting, leaving a part of the self-adhesive tape remains visible on the packaging.

Farther It is known that self-adhesive tapes in particular in their backing with imprints or inscriptions e.g. are provided for promotional purposes. Such imprints can be applied with any printing method. As a disadvantage However, it should be considered that for the production of a printed Adhesive tape this in an economically meaningful way only in big Editions can be made and thus an individualization especially for small quantities associated with very high costs.

The DE 81 30 861 U1 discloses a multilayer label of a thin and a thick self-supporting, opaque pigmented lacquer layer. Both layers each consist of an electron beam-hardened, solvent-free applied paint, wherein the layer thicknesses are different. The labeling of the label takes place in that with the aid of a laser, the upper thin lacquer layer is burned away, so that the lower thick lacquer layer is visible, wherein the lower layer preferably has a contrasting color to the upper. This is a kind of engraving to make manipulations on the label visible. Due to the brittleness of the paint layers, the label can be removed from a substrate to which it was glued, virtually only by destruction.

The EP 0 645 747 A1 describes a laser-markable multilayer label material composed of a first and a second optical layer differing therefrom, the first layer being removable by means of laser radiation corresponding to a desired typeface or print image with visualization of the surface of the second layer. Between the layers, a transparent plastic film forming a carrier layer is furthermore arranged.

The DE 44 21 865 A1 discloses a monolayer laser tag made of a plastic backing which contains an additive which exhibits a color change under laser irradiation. The carrier layer is coated on one side with a self-adhesive, which is optionally covered with a release paper or release film. The carrier film consists of a lacquer which is preferably radiation-cured.

The DE 199 09 723 A1 describes a security film with a carrier layer in which an identification medium is contained. With the help of a non-contact labeling process, the diffusion properties of this identification medium can be specifically selectively and locally changed. If the security film labeled in this way is adhered to a workpiece, the identification medium diffuses toward the substrate surface, where it causes a detectable reaction. In this case, this diffusion or reaction takes place only in those areas in the substrate surface in which the diffusion capability was triggered or not obstructed by the inscription process in order to enable a clear identification of the workpiece.

outgoing From this state of the art, the skilled person is faced with the task, to specify a self-adhesive tape, which can be customized individually is writable and with the a manipulation on the self-adhesive tape or the packaging thus sealed easily can.

These Tasks are solved by the features specified in claim 1.

Of the The core idea of the invention is that the splitting of a Self-adhesive tape when redrawing the self-adhesive tape, for example from a packaging not between two directly over the entire surface over the entire adhesive tape is applied to adjacent layers, but instead that the carrier layer only partially provided with an additional primer layer is. It can the materials of the carrier layer As well as the primer layer are selected by those skilled in such a way that between these Both layers a strong adhesive force or a permanent adhesive bond is trained. additionally becomes full surface a release layer on both the previously applied primer layer as well as on the not yet coated sections of the carrier layer applied. Here, the material of the separating layer is again chosen so that the release layer adheres very well to the primer layer and between the release layer and the not yet coated Sections of the carrier layer only lower adhesive forces occur.

It is understood that in turn to this separation layer in per se known Way an adhesive layer as an adhesive from suitable materials or Adhesive is applied to the self-adhesive tape, for example stick on a cardboard box. If necessary, can here also an additional deductible Cover be provided.

Becomes the tape is pulled off the packaging by an unauthorized person, this will be the carrier layer detached from the ground, due to the different set adhesive forces the Separating layer with lower adhesive force in the sections, the not with the extra Primer layer are provided, detached from the carrier layer and in the areas where the extra Primer layer was applied, this together with the carrier layer and the release layer is removed from the substrate. Thus, will a negative mask of those sections visible previously with the additional Primer layer on the carrier layer have been provided.

in this connection understands it for those skilled in the art that the primer layer preferably in such a pattern on the carrier layer is applied when removing the backing layer by an unauthorized person For example, a voice message "Caution" or "Package Open" becomes visible.

Consequently a self-adhesive tape is obtained in which before sticking the Self-adhesive tape on a packaging no labels or The like are visible and after the unauthorized detachment of the self-adhesive tape the warnings remain visible. This is also the Case, if the self-adhesive tape in turn exactly to the same position should be glued on the packaging, as at least to the For example, outlines of letters the transition edges always remain visible.

Of the Advantage of the invention is that by the additional applying a primer layer in sections, a reliable splitting of the self-adhesive tape is obtained when redrawing. It can the self-adhesive tape not only to identify an unauthorized opening of a Packaging to be used, but also to any substrates with Lettering, Logos or the like to provide. For this purpose, the primer layer with the desired Pattern on the backing layer applied, then the Release layer and then the self-adhesive tape in a known manner glued on the substrate and then peeled off, leaving the desired logos remain on the ground. With a suitable choice of materials or the respective prisoners can in particular all types of cardboard or paper such as paper qualities be provided with waste paper with appropriate labels.

advantageous Embodiments of the invention are characterized in the subclaims.

According to the embodiment of claim 2, the separation layer is formed so as to change its color locally under laser irradiation. Corresponding materials which can be introduced into the release layer and show a color change under laser radiation are known to the person skilled in the art. Thus, for example, in the production of the self-adhesive tape, the release layer can be dyed in the desired manner or labeled with lettering, logos or barcodes. After applying the self-adhesive tape to a package and redrawing markings remain in the desired color on the packaging. In the same way, papers, cardboard and the like may be provided with colored markings. In this case, the remaining sections can either be dyed uni over the entire surface or in the remaining sections, in turn, can be recognized by targeted lasering symbols, logos or the like. For example, known Nd-Yag solid-state lasers having a wavelength of 1064 nm can be used for inscribing the separating layer. At the point of impact of the laser, the laser pigment embedded in the separating layer absorbs the energy, so that local heating takes place here and, for example, carbonization of the adjacent polymer matrix forming the separating layer takes place. The parameters that are relevant for a label, such as performance, frequency and labeling speed can be determined by a person skilled in the art depending on the selected laser or laser pigments.

In Preferably, the carrier layer, as specified in claim 3, by a stretched thermoplastic film formed, which can be produced and processed in a simple manner. additionally can the thermoplastic film on the opposite side of the primer layer Be provided with a release coating to their handling to simplify.

For the composition of the release layer is proposed that it is composed of the following tabular listed raw materials:

Especially is proposed in claim 4, that the pigment content is between 0.1 and 10 weight percent and especially between 0.5 and 5 percent by weight moved. In this case, the powdery constituents the recipe first the aqueous Stirred suspension and then the aforementioned raw materials in the order listed one after the other with a commercially available agitator Room temperature are mixed together homogeneously. The application the release layer on the primer layer or on the not yet coated Sections of the carrier layer carried out with the help of a laboratory or Technikumstreichbalkens (wire squeegee).

there become according to the claim 5 between 2 and 18 grams per square meter the material of the release layer on the carrier layer or the primer layer applied and in particular between 5 and 11 grams per square meter. Subsequently becomes the coated carrier film at about 100 ° C Air temperature completely dried in a laboratory drying oven.

For the following Coating with the adhesive is specified in claim 6 that between 15 and 60 grams per square meter of a specialist applied in an arbitrarily configurable adhesive especially 20 to 30 grams per square meter.

One embodiment The invention is explained below with reference to the drawing: It shows:

1 : a self-adhesive tape in cross-section.

At the in 1 illustrated embodiment is the schematic representation of a self-adhesive tape 100 with a carrier layer 10 and an adhesive layer 11 , The carrier layer 10 , preferably a stretched thermoplastic film, may optionally be provided on its upper side with an additional release coating.

In the production of the self-adhesive tape 100 is on the carrier layer 10 partially a primer layer 12 gebacht, wherein the primer layer 12 preferably in the form of letters or symbols for reproducing information. The primer layer 12 points to the carrier layer 10 a very good adhesion.

The following is a separation layer 13 applied to both the primer layer 12 as well as the carrier layer 10 covering the entire surface. As indicated by the punctuation, the separation layer is 13 provided with laser-sensitive pigments, so that the self-adhesive tape can be provided without contact during production with a laser, for example, with logotypes, logos, warnings or the like. In this case, laser light of any wavelength can be used. In principle, it would also be possible for infrared-sensitive pigments to be used here.

backing 10 and separating layer 13 are matched to one another such that only a slight adhesive force exists between them, whereas the primer layer 12 and the separation layer 13 in turn, adhere well to each other.

Finally, an adhesive layer 11 applied from an arbitrary by the expert arbitrary adhesive to the self-adhesive tape 100 on any surface 14 such as paper, cardboard, packaging or the like to stick.

Will the self-adhesive tape 100 again from underground 14 peeled off, so splits the self-adhesive tape 100 such that the carrier layer 10 in the not with a primer layer 12 provided portions of the release layer 13 dissolves, leaving a part of the self-adhesive tape 100 on the ground 14 remains and accordingly, for example, the words "package open" is visible. This lettering would also remain visible if the self-adhesive tape 100 again would be glued exactly at the same position, since at least at the edges or transitions between primer layer 12 and separating layer 13 the symbols or letters remain visible.

In this case, a coloring of the release layer 13 either done in such a way that it is colored in the desired manner in solid color or in the release layer 13 also symbols, characters or the like can be seen.

100

self-adhesive tape

10

backing

11

adhesive layer

12

primer layer

13

Interface

14

underground

Claims (8)

Self-adhesive tape with a carrier layer ( 10 ) and an adhesive layer ( 11 ), characterized in that a primer layer ( 12 ) in sections on the carrier layer ( 10 ) is applied and a release layer ( 13 ) completely between the adhesive layer ( 11 ) and primer layer ( 12 ) or carrier layer ( 10 ) is arranged. Self-adhesive tape according to claim 1, characterized in that the separating layer ( 13 ) is variable in color under laser irradiation. Self-adhesive tape according to claim 1 or 2, characterized in that the release layer ( 13 ) or is labeled with lettering, logos or barcodes. Self-adhesive tape according to one of claims 1 to 3, characterized in that the separating layer ( 13 ) has laser-active color pigments. Self-adhesive tape according to one of claims 1 to 4, characterized in that in the release layer ( 13 ) between 0.1 and 10 weight percent of laser-active color pigments are provided, in particular between 0.5 and 5 weight percent. Self-adhesive tape according to one of claims 1 to 5, characterized in that the carrier layer ( 10 ) is a stretched thermoplastic film, which is provided in particular with a release coating. Self-adhesive tape according to one of claims 1 to 6, characterized in that the release layer with an application amount between 2 and 19 grams per square meter is applied, in particular between 5 and 11 grams per square meter. Self-adhesive tape according to one of claims 1 to 6, characterized in that the adhesive layer ( 11 ) is applied at an application rate of between 15 and 60 grams per square meter, in particular between 20 and 30 grams per square meter.