DE19836503B4 - Method for producing a security feature - Google Patents

Abstract

method for producing a security feature on special paper for documents, securities and banknotes according to process steps of conventional production a paper web over a wire (1) or a round screen (2) and embossing a watermark (24), being over a reservoir (16) on a feature substance transfer roller (7) and from this on embossed segments (25) an embossing roll (5) an electrically conductive feature substance on the paper web or the pulp web with the embossing process for producing the watermark (24) is applied and embossed, wherein the feature substance is a pigment or an electrically conductive and transparent polymer.

Description

The The invention relates to methods for producing a security feature for documents, securities and banknotes to raise the forgery security.

To increase the security against counterfeiting of papers, according to the DE 195 81 817 T1 introduced security elements made of metal fibers in different areas of a paper, which are detectable with different physical methods. The corresponding embodiment provides to introduce these metal fibers between, for example, two layers of fiber structures, which consists of a wire-forming section or a round screen of an aqueous suspension of cellulose fibers.

In the DE 43 44 552 A1 describes a method and an apparatus for equipping securities having authenticity features, wherein the authenticity features are dyes, fluorescers, magnetic and / or electrically conductive materials. The specific method for producing such securities with authenticity features provides that a homogeneous mixture of a feature substance present in powder form and a gas is produced in a defined concentration and that this mixture exits from at least one nozzle at high speed and the feature substance thus on the running paper web during paper making.

markable Papers and cardboard, and methods of making these and Use in the field of packaging, securities, security papers and graphic products is described in WO 98/35096. The Laser markable papers and cardboard have according to this Writing as absorbent an inorganic platelet-shaped substrate, for example, as a mica or pearlescent pigment or electrically conductive Pigment or mixtures thereof, on.

In WO 90/13877 is a security document with embedded security element in the form of a transparent thread with electrically conductive material describe in at least two layers, wherein at least one layer is transparent or partially pervious at least in some areas and the partially permeable Layer co-operates with the mark on the thread, that the license plates largely concealed in reflected light, in transmitted light but are visually recognizable. The one in the security document Contains security element electrically conductive Material which is applied as an opaque coating or made of reflective consists of metallic characters.

A method and an arrangement for testing metal filaments, tapes and particles is disclosed in U.S. Patent No. 5,376,874 DE 44 15 592 A1 described. The invention provides for introducing metallic constituents in a document into a field of a permanent magnet in such a way that the magnetic field lines emanating from the permanent magnet are cut by, for example, a metal strip inserted in a banknote. The voltage difference caused by the cutting of the field lines of the magnet is induced in a coil and detected in a coupling element and converted into a signal in an evaluation circuit.

Known are still special papers, which identification features for Include counterfeit protection. These will be during integrated in the papermaking process. So for example incorporated light-active feature substances. Some light-active feature substances are available on the market today, so that counterfeiters are able to recreate these already known security features. It be z. B. security features in the UV spectral range. These adjustments have a significant impact on counterfeit security.

Of Further, optical features in the form of watermarks will be in them Papers introduced. The watermark is currently only insignificant adjustment. Known forgeries refer to printing the papers with watermark-like representations. These are however with aids or in transmitted light or in the UV range recognizable.

A another possibility The security of papers is the integration of security threads or of safety bands. These security threads, safety belts are usually electrically conductive. The security threads or Safety bands exist predominantly of a metallized foil, partially with letters or numbers or symbols are demetallized or punched out. This extra Features are designed as optical features and are used for optical Hedging and as a technological hurdle for the counterfeiter. The threads themselves are detected by known capacitive sensors. in this connection becomes the electrical conductivity for one measured certain section of the thread. It is about to determine the presence.

At present, counterfeiters also these security threads are adjusted. These adjustments are carried out by applying hot-melt adhesive films or by applying metallic inks. For the viewer in fast banknotes, these adjustments are difficult to see. In addition, such adjustments for the ATMs are not always detectable. However, highly sensitive capacitive sensors can detect some of these counterfeits within small measurement tolerances.

task The invention is methods for producing security features for special papers for documents, Securities and banknotes for which the counterfeit electrically conductive feature substances in or on the paper web is increased.

The Invention will be described below with reference to the drawings embodiments explained in more detail and described. To be taken from the drawings and the description Features can in other embodiments the invention individually for itself or to several in arbitrary combination application find.

The Drawings show

1 Fourdrinier 1 ) a paper machine in a schematic side view and top view with illustrated method of partial integration of the feature substance in line form or in sections of a line,

2 Round screen ( 2 ) a paper machine in a schematic side view and top view with illustrated method of partial integration of the feature substance in line form or in sections of a line,

3 Round screen ( 2 ) of a paper machine in a schematic side view with subsequent watermark embossing roller ( 5 ), which takes over the material density change and thus the change of the electrical conductivity,

3a schematic plan view of a sheet material during the test and signal image of a sheet material with homogeneously introduced feature substance and subsequent embossed watermark,

4 Round screen ( 2 ) of a paper machine in a schematic side view with material inlet ( 4 ) for homogeneous integration of the feature substance,

5 Fourdrinier 1 ) of a paper machine in a schematic side view with headbox ( 3 ) for homogeneous integration of the feature substance,

6 Signal image when passing the sensor of a bank note with homogeneous feature substance equipment ( 6 ) and security thread ( 15 )

7 Signal pattern course when gluing a bank note with homogeneous feature substance equipment ( 6 ) and watermarks ( 24 )

7a Signal connection of the arranged sensors,

8th schematic side view of the watermark embossing roller ( 5 ) with feature substance transfer roller ( 7 )

8a Signal image of an electrically conductive watermark in conventional paper,

9 schematic representation with partial Merkmalsstoffauftrag on or feature substance integration in the paper web and

10 Signal images of partial feature substance detection.

feature substances exist with electrical conductivity usually made of solids, such as pigments in rod form or irregular shape. Furthermore, electrically conductive polymers are in different versions known.

The Presence of these different manifestations allows one Variety of technological possibilities the integration of the feature substance in the paper.

example 1

In this embodiment will manufacture special paper with electrically conductive pigments shown as feature substance.

In the machine chest ( 8th ) the pulp is mixed with the feature substance and kept under constant stirring as a homogeneous suspension. In the case of solid feature pigments, preferably 10% of the paper solids content is used as added amount. Depending on the type of detection, this proportional amount may vary.

at Using electrically conductive polymers gives the advantage that a good compatibility to other materials. The integration into the pulp is much less complicated than solid materials because it is electric conductive polymers also occur as a dispersion. The required concentration allows a nearly transparent electrically conductive mark.

The detection of homogeneously introduced feature substances ( 6 ) is measured by means of a capacitive scanner sensor ( 11 ) realized.

Example 2:

In this embodiment, a further possibility of homogeneous feature integration ( 6 ) shown in the pulp. Here are further codings by Stoffdichteänderung the watermark ( 24 ) reached. The technological process is identical to the formation of the pulp web with the first embodiment. The further processing of the pulp web is done by embossing watermarks.

The process of watermarking is done via a mechanical treatment of the pulp web, as in 8th shown schematically, omitting the feature substance transfer roller ( 7 ) and omitting the feature reservoir ( 16 ). In this case, by means of embossing roll ( 5 ) produces an impression on the pulp web. This embossing roll ( 5 ) consists of a carrier roll with applied embossing segments ( 25 ). These embossed segments in turn correspond to the pictorial representation of the watermark. The impression of the embossing segments ( 25 ) on the pulp web corresponds to the pictorial representation on the embossing roll ( 5 ). Such a mechanical partial treatment of the pulp web causes a change in the bulk density in the region of the watermark ( 24 ) with an impression-typical electrically conductive structure. This change in the electrical conductivity in the embossing area corresponds to the pictorial representation of the embossing segment ( 25 ).

If one now leads the thus produced sheet material over a capacitive scanner sensor ( 11 ), you get a signal image ( 23 ) for the embossing area ( 24 ) according to the pictorial representation and the scanner resolution.

In 7 shows how a banknote in landscape format the scanner sensor ( 11 ) and how the signal image ( 23 ) when gluing the sheet material with homogeneously introduced feature substance ( 6 ) and subsequently generated watermarks ( 24 ) arises.

Using barium sulfate as a feature substance, one achieves an additional coding in the optical range, because this substance is infrared absorbing. In 7 the sensor arrangement is shown schematically. The sensor arrangement of the capacitive scanner sensor is in this case with an optical scanner sensor ( 10 ) combined. In 7 the signal images of the capacitive scanner sensor ( 11 ) with a plurality of sensor channels and the optical scanner sensor ( 10 ) with its multitude of sensor channels during the checking process of a watermark ( 24 ), which was produced in the homogeneously labeled pulp. The obtained signals are fed to a controller in which a signal image comparison is performed.

Example 3:

A third exemplary embodiment represents a version of the production of partial feature substance test zones. After the formation of the conventional paper web, a watermark ( 9 ) generated. In this watermarking, the feature substance pigments or the feature substance are transferred to the paper web as a dispersion. In 8th this process is shown. A feature substance transfer roller ( 7 ) is passed through a reservoir ( 16 ) fed with feature substance. This feature substance transfer roller in turn runs against the embossing roller ( 5 ), the feature substance being applied to the embossing segment ( 25 ) is transmitted. Since the circumference of the embossing roller ( 5 ) the distance of the watermarks ( 24 ) corresponds to one another, the production of electrically conductive watermarks ( 24 ) possible on an endless track. In 8a is the emergence of the signal image on the scanner sensor ( 11 ).

Example 4:

In a fourth exemplary embodiment, the following description describes how partial deposition of feature substance on the paper web by means of a dripping device or by means of outlet pipes (US Pat. 17 ), which are located precisely positioned above the pulp web, is realized. A prerequisite for a uniform supply of the dosing device with feature substance is the circulation of the suspension by pumping ( 20 ) in the entire pipe system including the reservoir for feature substance ( 26 ). 1 and 2 represent, as by means of a precise, multi-arranged electronically controlled metering device consisting of an outlet pipe ( 17 ) and an automatic valve ( 19 ) a partial Merkmalsstoffauftrag or a feature substance integration in the pulp web, takes place. There are linear continuous partial test zones ( 14a ) and / or discontinuous partial test zones ( 14b ) or selective test zones ( 14e ), as in 9 represented, applied. Thus, when cutting the paper web into sheet material, partial feature zones are obtained. These can run over the entire sheet width or sheet length or be present in sections in the sheet width or sheet length. The width of the lines or the line segments is adapted to the scanner resolution. Preferably, the width is 2 mm.

1

wire

2

Round Screen

3

headbox

4

headbox

5

Watermark embossing roller

6

homogeneous Feature substance in the paper

7

Feature substance transfer roller

8th

machine chest

9

electrical conductive test zone watermark

10

optical scanner sensor

11

capacitive scanner sensor

12

optical Measurement curve, measured at the measuring channels of the opt. scanner

13

optical Sensors for activating the capacitive scanner sensor

14

partial test zones

15

electrical senior security thread

16

Feature reservoir

17

outlet pipe

18

control part for outlet pipe

19

automatic valve for discharge pipe metering device in conjunction with 17

20

pump for feature substance cycle

21

sensor channel even numbering

22

sensor channel odd numbering

23

measured curve capacitive scanner sensor

24

electrical conductive watermark in the homogenous pulp web

25

coin segment

26

Reservoir for feature substance for partial transmission

27

pressure roller

Claims (5)

Method for producing a security feature on special paper for documents, securities and banknotes according to method steps of the conventional production of a paper web over a wire ( 1 ) or a round screen ( 2 ) and embossing a watermark ( 24 ), whereby via a reservoir ( 16 ) on a feature substance transfer roller ( 7 ) and of this on embossed segments ( 25 ) an embossing roll ( 5 ) an electrically conductive feature substance on the paper web or the paper web with the embossing process for the production of the watermark ( 24 ) is applied and embossed, wherein the feature substance is a pigment or an electrically conductive and transparent polymer. A method for producing a security feature in special paper for documents, securities and banknotes according to process steps of the conventional production of a paper web with partial supply of electrically conductive feature substances in the pulp or with the addition of electrically conductive feature substances in the stock preparation or with coating order of electrically conductive feature substances on the pulp web and production of a watermark ( 24 ), whereby by means of embossing segments ( 25 ) an embossing roll ( 5 ) on the pulp web, a change in the substance density with a change in the electrical conductivity in the region of the watermark ( 24 ) of the type takes place that in a test of the electrical conductivity of the partially obtained signal image the imprint of the watermark ( 24 ), wherein the feature substance is an electrically conductive and transparent polymer. Method according to claim 1 or 2, characterized that the feature substance is used as dispersion and or suspension becomes. Method according to claim 1, characterized in that that the feature substance as an image of the embossing stamp or part of the image transferred the embossing stamp becomes. Method according to one or more of the preceding claims, characterized in that the circumference of the embossing roll ( 5 ) with their embossing segments ( 25 ) the distance of the watermarks ( 24 ) and thus the production of electrically conductive watermarks ( 24 ) is made possible on an endless track.