Interlaminar structure for security element
View Patent ↗A multilayer security element with at least two security features exactly disposed to each other is produced by the security features being present on separate carrier foils ( 100, 200 ) and the carrier foils being laminated with each other in such a way that the security features in the layer compound are disposed to each other in register. As to achieve an exact register of the security features, each carrier foil has register marks, with the help of which the foils are controlled relative to each other. The controlling is effected by stretching that carrier foil, the security features of which are running behind relative to the security features of the respective other carrier foil.
1. A method for producing a layer compound ( 6 ) with at least two security features disposed in register to each other, comprising the following steps:
providing a first carrier foil ( 100 ) with at least one first security feature and first register marks,
providing a second carrier foil ( 200 ) with at least one second security feature and second register marks,
joining the first carrier foil to the second carrier foil, at least one of the two carrier foils being under tensile stress and at least one of the second or the first carrier foil being controlled in longitudinal direction and transverse direction with the help of the first and second register marks in such a way, that a layer compound is the result, in which the first and second security features are disposed in register to each other, whereas the controlling of at least one of the second carrier foil ( 200 ) or the first carrier foil ( 100 ) is effected by stretching the carrier foil in longitudinal direction of the carrier foil.
2. The method according to claim 1 , wherein the second carrier foil ( 200 ) is shorter than the first carrier foil ( 100 ) and is stretched relative to the first carrier foil ( 100 ).
3. The method according to claim 1 , wherein the first carrier foil ( 100 ) due to the tensile stress undergoes a constant stretching in longitudinal direction of the carrier foil and the second carrier foil ( 200 ) is stretched relative to the stretching of first carrier foil ( 100 ).
4. The method according to claim 1 , wherein the carrier foils ( 100 , 200 ) are provided on rollers ( 3 , 4 ) and are drawn off the rollers, the stretching of at least one of the first and second carrier foil ( 100 or 200 ) in longitudinal direction of the carrier foil being achieved by a controlled slow down of this roller when drawing off the carrier foil from the respective roller.
5. The method according to claim 1 , wherein a registered joining of the two carrier foils ( 100 , 200 ) with respect to their longitudinal edges is achieved by means of a tension group ( 11 ).
6. The method according to claim 1 , wherein the tension group is controlled with the help of the first and second register marks.
7. The method according to claim 1 , wherein the register marks are read by means of light guides or CCD-cameras.
8. The method according to claim 1 , wherein the security features are used as register marks.
9. The method according to claim 1 , wherein the layer compound is divided into endless threads or endless strips.
10. A method for producing a security element comprising the procedure steps according to claim 1 , wherein from the layer compound ( 6 ) a security element with its final transverse and longitudinal dimensions is divided out.