TRANSFER TAPE WITH SECURITY FEATURES FOR THE SIDE EDGE OF AN ADHESIVE TAPE

Abstract

The invention relates to a method for attaching security features (8) to an adhesive tape (1), by introducing the security features (8) into a transfer layer (7) and applying the transfer layer (7) to a carrier film (6) to form a transfer tape (9) and pressing an outer side of the transfer layer (7) onto an end face (5) of a roll (4) of the adhesive tape (1) and adhering the transfer layer (7) on the roll end face (5) and peeling the carrier film (6) from the transfer layer (7), with the transfer layer (7) parting from the carrier film (6) and, with it, the security features (8) remaining on a side edge (11) of the adhesive tape (1).

Claims

1. A method for attaching security features to an adhesive tape, comprising: introducing the security features into a transfer layer, and applying the transfer layer to a carrier film to form a transfer tape, and pressing an outer side of the transfer layer onto an end face of a roll of the adhesive tape, and adhering the transfer layer on the roll end face, and peeling the carrier film from the transfer layer, with the transfer layer parting from the carrier film and, with it, the security features remaining on a side edge of the adhesive tape.

2. Method according to claim 1, wherein the carrier film is selected from a material selected from the group consisting of PET, PVC, PC, PP and PE.

3. Method according to claim 1, wherein the transfer layer comprises a coating layer and the coating layer is anchored with a first adhesive force on the carrier film and the coating layer is pressed onto the roll end face and, between the coating layer and the tacky regions of the roll end face, a second adhesive force is developed which is greater than the first adhesive force.

4. Method according to claim 1, wherein, between the coating layer and the carrier film, a primer layer is applied over the full area, and a third adhesive force between the primer layer and the coating layer is lower than the second adhesive force between the tacky regions of the roll end face and the coating layer.

5. Method according to claim 1, wherein the outer side of the transfer layer consists of a non-tacky coating layer.

6. Method according to claim 1, wherein an adhesive is applied over the full area externally to the coating layer opposite to the carrier film.

7. Method according to claim 6, wherein the adhesive is selected from the group of pressure sensitive adhesives based on acrylate, natural rubber, synthetic rubber, silicone, polyurethane or mixtures of these.

8. Method according to claim 1, wherein the coating layer is pressed onto the roll end face at a pressing temperature of less than 250 C.

9. Method according to claim 1, wherein the coating layer comprises colour pigments.

10. Method according to claim 1, wherein the security features are selected from the group consisting of IR active dyes or pigments, doped pigments, micro taggants, heat-sensitive substances, moisture-sensitive substances, refractive structures, laser-sensitive pigments and dyes, Holospots, interference pigments and electrical circuits.

11. Transfer tape for attaching security features to an adhesive tape, comprising a transfer layer which is applied on a carrier film, and wherein the security features are introduced in the transfer layer, and a first adhesive force between the transfer layer and the carrier film being lower than a second adhesive force between an end face of a roll of the adhesive tape and the transfer layer.

12. Transfer tape according to claim 11, wherein the carrier film on one side has a relief structure to which the transfer layer is applied, and the transfer layer adopts a negative of the relief structure.

13. Transfer tape according to claim 11, wherein the relief structure extends over the entire extent of the side of the carrier film.

14. Transfer tape according to claim 11, wherein the transfer layer comprises at least one coating layer.

15. Transfer tape according to claim 11, wherein the at least one coating layer comprises a plurality of different coating layers.

16. Transfer tape according to claim 11, wherein the at least one coating layer is selected from the group consisting of aqueous, solvent-borne and radiation-crosslinked coating materials.

17. Transfer tape according to claim 11, wherein a layer of pressure sensitive adhesive is applied over the full area externally on the coating layer, opposite to the transfer film, this layer of adhesive being based on acrylate, natural rubber, synthetic rubber, silicone, polyurethane or mixtures of these.

18. Transfer tape according to claim 11, wherein the security features comprise IR active dyes or pigments, doped pigments, micro taggants, heat-sensitive substances, moisture-sensitive substances, refractive structures, laser-sensitive pigments and dyes, Holospots, interference pigments and/or electrical circuits.

Description

[0079] The invention is described in reference to an exemplary embodiment. Here:

[0080] FIG. 1 shows a roll of adhesive tape with end face and also the transfer tape of the invention,

[0081] FIG. 2 shows a roll of adhesive tape with end face after transfer of part of the transfer layer of the transfer tape to the roll end face,

[0082] FIG. 3 shows the adhesive tape prepared in FIG. 2, after use thereof for bonding two component surfaces together.

[0083] FIG. 1 shows an adhesive tape 1 having a substrate web 2 and an adhesive web 3. The adhesive tape 1 is wound up to form an adhesive tape roll 4. The adhesive web 3 and the substrate web 2 are disposed in alternation along a radius of a roll end face 5. The substrate web 2 is not adhesive; the adhesive web 3 is adhesive. FIG. 1 also shows a short transfer tape 9 of the invention, having a carrier film 6 and having a transfer layer into which security features 8, here in the form of fluorescent pigments, have been introduced. The transfer layer consists of a coating layer 7. The transfer tape 9 here comprises the carrier film 6, to which the coating layer 7 has been applied, consisting of Tesa 64007, a UV curing coating system applied by means of flexographic printing. The coating layer 7 is anchored on the carrier film 6 with a first adhesive force. After the pressing (not shown) of the transfer tape 9 with the coating layer 7 onto the roll end face 5, as represented by the arrow in FIG. 1, and after subsequent peeled removal of the carrier film 6 from the roll end face 5, parts of the coating layer 7 with the security features 8 remain at least on the tacky regions of the roll end face 5, corresponding to the side edges 11 of the adhesive web 3 of the roll end face 5, as shown in FIG. 2. Side edges of the substrate web 2 are free from the coating layer 7. A second adhesive force, between the adhesive web 3 of the roll end face 5 and the coating layer 7 pressed onto the roll end face 5, is greater than the first adhesive force referred to above, and so, by peeled removal of the carrier film 6, the coating layer 7 breaks up and remains adhering partly on the roll end face 5, while the other part of the coating layer 7, pressed onto the roll end face 5 along the substrate web 2, is detached again with the carrier film 6.

[0084] Directly after being pressed onto the roll end face 5, the transfer tape 9 can be peeled off again, but it is also possible for it to remain on the roll end face 5 initially, for storage or the like, and to be peeled off only at a later point in time. In that case the transfer tape 9 may be peeled off only a number of hours or even days later. On the one hand, storage may be facilitated by the transfer tape 9 remaining on the roll end face 5; on the other hand, at least with certain varieties of the coating layers 7, an improved adhesion may be developed between the roll end face 5 and the coating layer 7.

[0085] The carrier film 6 of the transfer tape 9 is peeled off, and either the whole or substantially the whole coating layer 7 may remain on the roll end face 5, so that onlyor essentially onlythe carrier film 6 is removed by peeling.

[0086] An alternative option is for only part of the coating layer 7 to remain on the roll end face 5. For this purpose, the first adhesive force, between the carrier film 6 and the coating layer 7, is lower than the second adhesive force, between the tacky regions of the roll end face, i.e. side edges 11 of the adhesive web 3 and the coating layer 7.

[0087] The roll 4 of adhesive tape shown in FIG. 2 is passivated for storage. The tacky side edges 11 of the adhesive web 3 are passivated by the applied parts of the coating layer 7. The passivated roll 4 of adhesive tape can be used further in accordance with FIG. 3.

[0088] FIG. 3 shows schematically a use of the adhesive tape 1 in FIG. 2. For this purpose, a section of the adhesive tape 1 is unwound and is cut off from the roll 4 of adhesive tape, and a first free side of the adhesive web 3 is pressed onto a first component surface 12. The substrate web 2 is then peeled off from the adhesive web 3, and a second component surface 13 is pressed onto the second free side of the adhesive web 3, formed as a result of the peeled removal, in accordance with FIG. 3. The free outer sides of the adhesive web 3 are free from the coating layer 7 and from the security features 8. The coating layer 7 and the security features 8 are found only on the roll end face 5 and, after the use of the adhesive tape 1, on the side edges 11 of the adhesive tape 1 removed by cutting. Advantageously, however, the security features 8 are still readily recognizable from the outside, between the component surfaces 12 and 13, and are not hidden by the component surfaces 12 and 13, and in the case of electronic circuits can be easily read out.

LIST OF REFERENCE NUMERALS

[0089] 1 adhesive tape [0090] 2 substrate web [0091] 3 adhesive web [0092] 4 roll of adhesive tape [0093] 5 roll end face [0094] 6 carrier film [0095] 7 coating layer [0096] 8 security feature [0097] 9 transfer tape [0098] 11 side edges [0099] 12 first component surface [0100] 13 second component surface