Method for producing a document and a document

Patent metadata

Field	Value
Publication number	US-10434813-B2
Application number	US-201615564013-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 8, 2015
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A method for producing a security document, with a thermographic substrate wherein the thermographic substrate is caused to undergo a color change depending on temperature effect in at least one first region A film element is arranged in such a way that the film element is arranged between the at least one first region of the thermographic substrate and a thermal print head. At least one first item of information is introduced by means of the thermal print head by activation of the color change in the at least one first region of the thermographic substrate, wherein the thermal print head, during the introduction of the at least one first item of information is in contact with the film element in such a way that the temperature effect causing the activation of the color change is transferred from the thermal print head through the film element to the at least one first region of the thermographic substrate.

First claim

The invention claimed is:

1. A method for producing a security document, with a thermographic substrate, the method comprising:
(a) providing the thermographic substrate, the thermographic substrate having a thermosensitive layer comprising color-producing substances which, under the effect of warmth, react chemically, such that the thermographic substrate is caused to undergo a color change depending on temperature effect in at least one first region;
(b) arranging a film element in such a way that the film element is arranged between the at least one first region of the thermographic substrate and a thermal print head, the film element having a transfer ply comprising one or more first layers; and
(c) introducing at least one first item of information by means of the thermal print head by:
i) warming the thermographic substrate to chemically react the color-producing substances of the thermosensitive layer in the at least one first region of the thermographic substrate, and
ii) applying the transfer ply of the film element in the at least one first region of the thermographic substrate,

wherein the thermal print head, during the introduction of the at least one first item of information while applying the transfer ply of the film element in the at least one first region of the thermographic substrate, is in contact with the film element, in such a way that the temperature effect causing the activation of the color change is transferred from the thermal print head through the film element to the at least one first region of the thermographic substrate.

2. The method according to claim 1 , wherein, in step c), by color change of the thermographic substrate in the at least one first region, a first color is produced and the one or more first layers of the film element which are applied to the security document, in the at least one first region in step c), are formed colored in a second color at least in regions, wherein the first color and the second color are different colors, of the RGB color space.

3. The method according to claim 1 , wherein the film element arranged in step b) has one or more dyes and/or one or more adhesives, and in step c) the one or more dyes and/or the one or more adhesives are melted on during application.

4. The method according to claim 1 , wherein the film element arranged in step b) has a replication varnish layer, a detachment layer and a transparent protective varnish layer, and wherein a relief structure is molded into the replication varnish layer at least in areas, and wherein the detachment layer is arranged between the replication varnish layer and the transparent protective layer, and wherein the replication varnish layer is facing the thermal print head, and wherein, in step c), the transparent protective varnish layer is applied to the security document, by means of the thermal print head in such a way that a relief structure that is inverted with respect to the relief structure of the replication varnish layer is molded into the transparent protective varnish layer.

5. The method according to claim 1 , wherein, in at least one second region, the temperature effect causing the activation of the color change is selected such that, in the at least one second region, the at least one first item of information is not introduced into the thermographic substrate and the one or more first layers of the film element are applied to the security document, for the representation of at least one second item of information by means of the thermal print head.

6. The method according to claim 5 , wherein the at least one first region and the at least one second region lie in the maximum recording range of the thermal print head, wherein the maximum recording range corresponds to the maximum area of the thermal print head, with which the thermal print head is in contact with the film element during the introduction of the first item of information in step c).

7. The method according to claim 1 , wherein the thermographic substrate provided in step a) is caused to undergo at least two color changes depending on the temperature effect in at least two first regions, wherein the at least two color changes are caused when at least two different temperature limits are exceeded.

8. The method according to claim 1 , wherein the thermographic substrate provided in step a), at least in regions, has one or more second layers that are transparent at least in regions, wherein the one or more second layers are arranged between the film element and the thermographic substrate, when observed perpendicular to the plane spanned by the upper side of the thermographic substrate, and wherein, in step c), the temperature effect causing the activation of the color change is transferred through the one or more second layers to the at least one first region of the thermographic substrate.

9. The method according to claim 1 , wherein, in step c), the temperature effect is more than 50° C.

10. The method according to claim 1 , wherein, in step c), the thermal print head, at least in regions, has a temperature of more than 70° C.

11. The method according to claim 1 , wherein the method is carried out by means of a thermal transfer printer.

12. The method according to claim 1 , further comprising applying at least one sealing layer to the security document.

13. The method according to claim 12 , wherein, the at least one sealing layer is applied by means of cold lamination.

Assignees

• Leonhard Kurz Stiftung & Co Kg
• Ovd Kinegram Ag
• Kurz Typofol Gmbh

Inventors

• Hansen Achim
• Schuller Kilian
• Cathomen Anja
• Falsch Sascha
• Schuler Philipp

Classifications

• B41M2205/38

  Intermediate layers; Layers between substrate and imaging layer · CPC title

• B42D25/328

  Diffraction gratings; Holograms · CPC title

• B42D25/30

  Identification or security features, e.g. for preventing forgery · CPC title

• B41M3/142 Primary

  using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes · CPC title

• B42D25/324 Primary

  Reliefs · CPC title