DE202014104386U1 - Safety thermal carrier - Google Patents

Abstract

Security thermal printing substrate with a base layer (1), a separating layer (2) arranged on this base layer (1) and a heat-sensitive layer or thermal layer (3) which is attached to the separating layer (2), characterized in that a security color layer (7) is arranged along one of the separating layer (2) opposite surface of the thermal layer (3) is attached, which contains iridescent pigment plates.

Description

The subject invention relates to a security thermal print carrier having a base layer, a release layer disposed on said base layer, and a heat-sensitive layer or thermal layer attached to said release layer.

In all areas of the economy, including transportation, direct thermal printers are best suited for customizing informational content that can be used in counters such as passenger ticket machines. The basis for protection against counterfeiting of the tickets thus created is the protection of the paper material used as a basis for the tickets. Counterfeiters obtain the base paper most used for counterfeiting purposes by chemically removing the original content from an already depreciated or low value unused ticket and then applying the wrong content to the surface by a different method (laser printing) of the base paper. The counterfeits produced with such a method are of very good quality and can usually only be explored by means of a targeted examination with the use of instruments. The economic damage caused to the service providers can be significant, so the ticket base paper manufacturers have developed various protective measures. In previous security solutions, chemical protection in the heat-sensitive layer or in the base layer, e.g. B. formed in the base paper. There are those fluffy fibers which fluoresce in different colors when illuminated with UV light, or so-called "planchets", which are usually those paper discs with a diameter of 2 to 3 mm containing any reagent for the purpose of chemical protection. The color content of the substances used for the purpose of chemical protection can be removed without residue from the paper material by means of prolonged and copious soaking. A protection of this kind serves exclusively the defense against partial change of the data contents.

WO 01/05603 provides protection against counterfeiting of a data carrier, e.g. As a ticket is a method in the course of which a control mark on the paper is visible as a result of a further external influence. The control mark contains at least one thermal opaque coating comprising a polymer matrix composition containing melamine formaldehydes and acrylic resins, and a coldset ink type thermosensitive substance containing 1-hexadecanol and 4-ethylphenol, butanol, amine resin and ethyl acetate. The external effect can be a thermal action or UV irradiation, for. B. be a thermal print. However, this solution is disadvantageous in that although the originality of the base paper is confirmed, no protection is provided against the chemical invisibilization of the elements produced in the thermal coating by means of thermal printing and against the subsequent generation of superficial color printing.

It is therefore an object of this invention to provide a security thermal print carrier which is capable of overcoming the disadvantages of the prior art solutions, i. H. a falsification of the data content of the print carrier should be clearly perceptible to the naked eye, whereby invisibilization of the elements produced in the thermal layer by means of thermal printing by chemical means and a subsequent discharge of a superficial color printing is useless.

The object has been achieved by the production of a security thermo-print carrier comprising a base layer, a release layer disposed on this base layer, and a heat-sensitive layer or thermal layer attached to the release layer with a security color layer attached along one of the release layer opposite surfaces of the thermal layer contains iridescent pigment plates.

Between the thermal layer and the protective color layer containing the iridescent pigment plates, a protective layer is expediently arranged which is connected to the security color layer by means of insoluble chemical bonding.

The thickness of the pigment plates is at most 3 μm.

The thickness of the security ink layer containing the pigment plates is at most 5 μm.

A protective layer is attached to the surface of the base layer opposite the release layer.

The object of the invention will be described in more detail below with reference to a preferred embodiment with reference to the accompanying drawings.

Show it

1 a section of an embodiment of a Sicherheitsthermodruckträgers according to the invention in cross-section, and

2 the location of an after the thermal printing subsequently printed on the Sicherheitssthermodruckträger imprint.

1 shows the structure of an embodiment of a Sicherheitsthermodruckträgers according to the invention in cross section. A base layer 1 of the print carrier essentially consists in the illustrated embodiment of a paper layer, but the base layer 1 can also be made of other materials, eg. B. made of plastic. On the base layer 1 is a separation layer 2 attached to the base layer 1 and a heat-sensitive layer, ie, a thermal layer 3 of the print carrier separates from each other, at the same time with each other. In 1 was in the thermo-layer 3 a discoloration 6 drawn after thermoprinting a part of the in the thermo-layer 3 of the print carrier resulting data content forms. When in the 1 illustrated preferred embodiment is a protective layer 4 on the thermo-layer 3 which protects the latter against environmental influences. The protective layer 4 can be used with preference in those applications where the durability and the protection of the thermal layer 3 the print carrier is to be strengthened against environmental influences. The security thermal print carrier according to the invention can therefore also without application of the protective layer 4 getting produced. A similar situation also exists in a protective layer used in the embodiment shown in the figure 5 ,

It is in the 1 well visible on the surface of the protective layer 4 facing the thermo layer 3 lies, a security color layer 7 is attached, which is heat resistant and iridescent, ie suitable for color change, allophanie, color scintillators and is made from a after thermal printing their color changing printing ink "FLEXO" (persoprotect flexo ink). As already mentioned, in such a case where the protective layer 4 is omitted, the security color layer 7 directly on the thermo-layer 3 be applied, the safety color layer 7 but is under any circumstances on that surface of the thermo-layer 3 arranged, facing the separating layer 2 is and is preferably applied by means of a printing process on the print carrier.

The security color layer 7 generated on the surface of the protective layer 4 by oxidizing polymerization, or by cohesive forces a strong and insoluble bond. The security color layer 7 is made from acrinate-based heat-resistant coating containing a mixture of an aqueous acrylate emulsion of 25%, additives (for foam retardation, flowability, pH adjustment, bactericides, fungicides, isopropyl alcohol) in an appropriate ratio of 5.5% in total, water of 68, 5-64.5%, further iridescent metallized pigment plates z. B. on rutile basis of 1-5%, the structure reflect incident light in different colors. This mixture can be prepared with a paddle stirrer at a stirring speed of 500 rpm in 20 minutes. While the white, z. B. the paper backing backing layer 1 reflects all colors and these add up with the colors of wavelengths reflected by the pigment plates, the background color becomes due to discoloration, which under the thermal ink layer during the thermal printing process 7 in the thermo-layer 3 comes about, modified. This resulting black discoloration 6 Swallows the incoming colors so that only the colors reflected by the pigment plates become visible. A common feature of the iridescent pigment plates is a different metallic and pearlescent gloss and a mixture of mica schist and titanium dioxide produced in special processing. The thickness of the plates of the pigment pills having a plate structure in the security color layer 7 is at most 3 microns, their other maximum dimensions can reach 200 microns. It is therefore advisable to use the safety color layer 7 in a thickness of 3 to 5 microns on the protective layer 4 apply. Since acrylates have a poor thermal conductivity, a layer thickness of more than the mentioned 5 microns is not advisable. Unfortunately, the poor thermal conductivity is not even improved by the iridescent pigment plates mixed in the paint. The applied safety color layer 7 forms a closed, water- and solvent-resistant paint layer 7 , It is not appropriate to the color coat 7 Apply to the entire surface of the print carrier, because the iridescent effect is better shown when the paint layer 7 created a drawing.

The color layer 7 may suitably be applied in an area of the print carrier to be protected with data content, since any data content is under the protective layer 4 can be read out. The color layer 7 is identifiable as a security print due to its highly visible discoloring effect, and the data content printed by a thermal printer is easy to read. The above due to the thermal printing (eg printing of ticket data on the print substrate) under the ink layer 7 incurred black thermal dye 6 located color layer 7 reflects the incoming light purple or green colors instead of the original gray-green color. By the discoloration (ie imprint) produced by the thermal printer from the thermo-layer 3 is removed, which also causes the thermo-layer 3 becomes unprintable, can subsequently only on the surface of the color changing coat of paint 7 with a different from the thermal printing printing method, for. As laser printing, but not under the layer, as is the 2 is removable, can be printed. Since the subsequently applied print image on the previously printed color layer 7 is present, omitting the color play of the color layer shown above 7 and the color changing security color layer 7 is clearly visible concealed by the subsequently printed impression. The difference is clear and provides reliable protection against the counterfeiting method mentioned above.

It is also advantageous if in the color layer 7 such a security element is embedded, which serves to protect the authenticity of transport tickets. It is advantageous if this element neither with the naked eye nor with simpler means, for. As a magnifying glass, UV lamp, etc. can be perceived. It is also advantageous if this security element is also suitable for automatic testing within the ticket vending machine. This security element can, for. Example, be an active in the infrared region material that emits in response to excitation radiation, an infrared radiation having a characteristic spectral distribution in the range of 800 to 1200 nm. This emission can be detected with a hand-held detector developed for this purpose. The detector gives clear sound and light signals by detecting the presence of the material or security element.

Since this infrared emission means an intense emission and on the spectral level is clearly separated from the emissions of the material of the ticket and its prints, is particularly well suited for automated controls.

The color layer emitting in the infrared region 7 containing pigments of suitable erbium or ytterbium activated rare earth metals and iridescent, metallized rutile-based pigment plates, is therefore also suitable for the protection of the filling of the ticket and the authenticity of the ticket.

The security thermal print carrier according to the invention, in contrast to the prior art solutions, is capable of unambiguously identifying the falsification of its data content with the naked eye, thereby eliminating chemical elements formed by thermal printing in a thermal blanket and subsequently producing a surface print 10 becomes useless.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 01/05603 [0003]

Claims (6)

Security thermal print carrier with a base layer ( 1 ), one on this basic layer ( 1 ) separating layer ( 2 ) and a heat-sensitive layer or thermal layer ( 3 ) attached to the release layer ( 2 ), characterized in that a security color layer ( 7 ) along one of the separating layers ( 2 ) opposite surface of the thermal layer ( 3 ) containing iridescent pigment plates. Security thermoprinting backing according to claim 1, characterized in that a protective layer ( 4 ) between the thermo layer ( 3 ) and the protective color layer containing the iridescent pigment plates ( 7 ), the protective layer ( 4 ) of the security color layer ( 7 ) is connected by means of insoluble chemical bond. Security thermoprinting support according to claim 1 and / or 2, characterized in that the thickness of the pigment plates is at most 3 microns. Security thermoprinting support according to one of claims 1 to 3, characterized in that the thickness of the security color layer containing the pigment plates ( 7 ) is at most 5 microns. Security thermoprinting support according to one of claims 1 to 4, characterized in that on the release layer ( 2 ) opposite surface of the base layer ( 1 ) a protective layer ( 5 ) is attached. Security thermal print carrier according to one of claims 1 to 5, characterized in that the security color layer ( 7 ) Contains pigments from rare earth metals that emit in an infrared region.

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