Paper protected against simulation, provided with coding of luminescent blended fibers

FIELD: applicable for manufacture of paper protected against simulation.

SUBSTANCE: the paper protected against simulation, having blended fibers at least of two types that differ in their luminessent properties and form a coding or coded combination. There are at least two definite separate sections, on which blended fiber of only one type are available. The coding or coded combination is formed due to a definite geometrical layout of such separate sections on the paper protected against simulation and/or due to the presence or absence of blended fibers of a definite type. According to the second modification, similar blended fibers are present on both separate sections.

EFFECT: enhanced reliability of readout and identification at automatic control.

14 cl, 6 dwg

 

The present invention relates to tamper-resistant paper with a blend of fibers of at least two types, which differ in their luminescent properties and form encoding or code combination.

The use of melange fibers as security features to protect documents against forgery known for a long time. Typically, such fibers are short, synthetic or cotton fibers, which are buried in the protected from a fake paper in the process of its production. The advantage of heathered fibers before the protective characteristics of other types, such as plates or mica particles is that they are smaller and visually inconspicuous and therefore, from an aesthetic point of view, practically does not affect the General appearance of a counterfeit document.

From DE 677711 known fluorescent when excited with UV radiation melange fiber, which mix in the pulp before forming the sheet, resulting melange fiber subsequently be randomly distributed over the volume of the finished counterfeit paper. In addition, you can also use blend fibers with different fluorescence radiation, resulting in their UV-radiation excitation occurs mixed the fluorescence.

From DE 3122470 C2 also known counterfeit paper embedded in it luminescense melange fibers. Such melange fiber made of cellulose acetate, and painted all over their volume is characterized by a narrow range of radiation by phosphors from the group of compounds of the lanthanides. Such phosphors, which can be introduced into the material fibers in a concentration that a maximum of 20 times the concentration used previously known phosphors, are characterized, in addition, a relatively narrow-band emission spectrum. Of these heathered fibers can also twist or weave protective threads. If you apply for this purpose the individual fibers with different luminescence, the result can also get some coding or code combination, based on quantifiable analysis of the presence or absence of certain phosphors. Such rolled or obtained by the spinning of the thread is most preferable to use as visually distinct signs of authenticity. However, despite the relatively high yield of luminescence proposed in the specified publication phosphors intensity of the luminescence of individual fibers is too small to provide in practice a reliable automatic control of authenticity supplied with such in the Windows documents.

Based on the foregoing, the present invention was used to develop tamper-resistant paper with luminescense melange fibers, forming a specific encoding or code combination, which would provide a reliable reading and recognition during automatic control.

This task is solved by the features presented in the independent claims. Preferred embodiments of the invention are given in the respective dependent claims.

The basic idea of the invention is that for a reliable automatic control heathered fibers with sufficiently high signal-to-noise melange fibers with different fluorescent properties should be placed separately at a sufficient spatial distance from each other. With this in mind, the proposed invention is protected from a fake paper distinguish separate non-overlapping areas, each of which feature a heathered fiber one specific type with a specific fluorescent properties. While encoding or code combination can be formed due to the specific geometric arrangement of the individual sections on anti-forgery paper and/or due to the presence or lack of the Oia melange of fibers of a particular type.

Location melange of fibers with different properties on a separate limited areas makes it relatively easy to locate them and to measure their luminescent properties independently of each other and without their mutual influence. As one separate section contains homogeneous blend of fibers with only one specific set of luminescent properties, the intensity of the measured signal compared with the known counterfeit documents increases only due to the higher surface density melange of fibers on the scanned area. The output luminescence could be further enhanced through the use of special phosphors with high-intensity narrow-band fluorescent radiation is described, for example, in patent US 5448582. Such phosphors are multiphase systems containing optical "pump" light-emitting material, light-scattering centers and the transparent matrix material. These materials create a similar laser effect, consisting in the emission of extremely narrow-band radiation. Another advantage of these materials is that in the manufacture of paper the wavelength of radiation they emit can be targeted "adjusted" in some limited areas to clean the common value.

Light-scattering centers consist of transparent materials in the form of particles, preferably with a high refractive index. The phosphor during its excitation via flash lamp absorbs part of the radiated such a lamp light and the result goes into an excited, so-called "optically pumped" state. The luminescent glow arises from spontaneous emission in the excited state, while at least some portion of the emitted fluorescent radiation is not released immediately from the material to the outside, and partly repeatedly scattered by the light-scattering centers. The result is a significant increase in the intensity of fluorescent radiation, which in addition lies in a very narrow band.

The advantage associated with the use of phosphors with narrow band radiation, is that when measuring fluorescent glow of the sensitivity range of the sensor (detector) can limit the narrow region of the spectrum, which is the band emitted by the one or the other phosphor radiation. As a result, when the measurement is suppressed by the influence of background radiation from adjacent spectral regions and increases the signal-to-noise.

However, you can apply other phosphors preferably with a narrow-band radiation, because UB is the tier of the measured signal depends not only on the intensity emitted by the fluorescent pigment radiation, but also on the concentration of added melange fiber phosphor, as well as from the surface density melange of fibers on the paper.

However, when the surface density should be aware that melange fibers to increase their surface density become increasingly visible and increasingly degrade the aesthetic overall appearance is protected from a fake paper, which is often sealed artistic graphic image. For this reason, the surface density of the blend fibers should be from 2 to 20 fibers per square centimeter. However, undesirable effects associated with the deterioration of the aesthetic overall appearance is protected from a fake paper, can also be reduced by appropriate location on it in some spots. In other words, some parts are preferably positioned so that they do not interfere with the main story of the art of the graphic image.

Since, as already mentioned, heathered fiber by visual examination tamper document should be the extent possible, inconspicuous, according to one preferred options as such melange fibers are encouraged to use transparent polymer fibers, dyed is passed around the terms of the phosphors, which are also almost completely transparent in the visible region of the spectrum.

Phosphors if they have a specific color, and also provided that the luminescent glow of such phosphors has the correct intensity, you can also add in heathered fiber in such small concentrations, so that these fibers remained, as before, is almost completely transparent.

In another embodiment, however, the phosphor can be applied only on the surface of the fiber, for example by immersion in a dye solution.

In addition, as the fibrous materials can be used and other materials that allow recycling of thin fibers, such as silk or cotton.

Preferably, separate sections, which have heathered fiber was in the form of strips running the full width is protected from a fake document. The width of these strips is preferably from 5 to 30 mm, However, these separate parts may have a contour or any other shape, such as rectangular, round, oval, star, etc.

According to the invention in the manufacture of counterfeit paper melange fibers are buried in it so that they at least partially formed of a mesh structure with fibrous material is paper and the result is at least partially overlap on the surface of the paper its fibers.

In the manufacture of paper on kruglosutochno paper machine most suitable for introduction or sealing melange fibers in the infinite, having the form of strips separate sections, for example, is the so-called method of Wilcox. This method consists in the fact that melange fibers are suspended in water, getting water suspension, which in the manufacture of paper is passed through the pipe, the output of which is equipped with a special nozzle, and put on a rotating mesh cylinder near the place where begins the formation of the sheet on a grid cylinder. Under the influence of a prevailing inside the grid cylinder vacuum is a direct dehydration layer caused by melange fibers, resulting in these heathered fibers are tightly attached to the mesh cylinder together with the first layer for layering on him the paper fibers.

In the manufacture of paper on clinocerinae PM fiber can be applied to a long net in the same way.

Depending on the type of encoding or code combination in a paper machine in parallel to each other are installing multiple devices for applying melange of fibers with different fluorescent properties. Device management supply melange fibers assests which is in accordance with a put on paper the encoding or code combination. If the encoding or code combination is determined only certain geometric arrangement of individual sections, each of which provide a blend of fibers of the same type, except type heathered fibers provided in other sections, the position of these feeders melange fibers of the paper machine appropriately regulate before the beginning of the paper manufacturing process. After that, the supply of melange fibers is carried out in a continuous mode.

If the encoding or code combination is determined solely or additionally by the presence or absence of a blend of fibers of one or more types, the supply of these heathered fibers should be terminated in accordance with the new encoding or code combination. If the encoding or code combination does not change in the manufacturing process of the paper web, in this case, before beginning the process of making paper is sufficient to appropriately adjust the position of the feeder melange fibers of the paper machine.

Herself encoding or code combination may carry any information, for example to reflect the value, date of issue, the name of the country of the Issuer of the securities, etc.

Finish is protected from a fake boom is GU, which, along with the proposed invention encoding or code combination can be, obviously, and other protective elements such as the security thread or a similar protective characteristic, subsequently subjected to conventional processing, first of all, seal and cut into individual protected against forgery of documents, such as banknotes, shares, cheques, etc.

When automatic control is protected against forgery encoding or code combination is checked with appropriate sensors for the presence of specific analyze the luminescence properties of melange fibers and the result of measurement is compared with a reference or control value. When the control luminescent properties can, for example, to analyze the wavelength of luminescence or the time of its decay.

Other advantages and features of the invention discussed below in more detail by the example of some variants of its implementation with reference to the accompanying drawings. This is shown in these drawings, the image is made not to scale and serve only to illustrate based on the underlying principles of the invention. In the drawings, in particular, shows:

figure 1 is a view in plan is protected from a fake document, in this case, the banknote, with three having the form of strips of the Department is implementing the land, which are heathered fiber,

figure 2 (2A and 2B) is a view in plan of two protected from forgery with four shaped strips separate areas each defining a different encoding or code combination,

figure 3 is a plot of the spectrum, reflecting the spectral distribution of the wavelength of the radiation, with four preset intervals of wavelengths for a coding system which requires the use of four different phosphors,

figure 4 - diagram of a system for measuring luminescence properties of melange fibers arranged in various separate areas are protected from a fake document, and

figure 5 - time response of the electrical signals at the output of the photodetector (light detector)used in shown in figure 4 the system, when checking depicted on figa document.

Figure 1 in a view in plan showing protected from a fake document 1, in this case, the banknote is made of tamper-resistant paper 2. This is protected from a fake document 1 repeatedly sealed artistic graphic image 4 (not shown), the circuit 3 which occupied the fields marked by a dotted line. Phantom lines protected from a fake document 1 identified three which have the form of strips control plot 8A, 8b, 8C. These participation is part of the corresponding detector checks the luminescent properties melange fibers. Therefore, the position of such sites is protected from a fake document 1 is formed by them controlled code combination.

The distance between the control sections 8A and 8b is marked with the letter a, and the distance between the control sections 8b and 8C is marked with the letter b, and these distances a and b in this case are not equal. The ratio between the distances a and b can be set, for example, integer. Within each of these three shaped strips control sections 8A, 8b, 8C are shaped strips separate sections 5A, 5h, 5s, on which the material is protected from a fake paper 2 sealed melange fiber. The boundaries of such shaped strips of individual sections 5A, 5b, 5C indicated in figure 1 by solid lines. Such solid line, however, is shown for illustrative purposes only and genuine counterfeit document they are missing.

Shown in figure 1 embodiment, all having the form of strips separate sections 5A, 5b, 5C are provided melange fibers of the same type A, i.e. for all these separate sections 5A, 5b, 5C melange fibers have the same y properties. In this embodiment, a code combination, formed of separate sections 5A, 5b, 5C, respectively, of the control participants who AMI 8A, 8b, 8C, is determined only by the distances a and b between them.

Figure 2 : examples of two protected against forgery of documents 1a, 1b illustrates another possibility of execution proposed in the invention encoding. In this case, the control sections 8A, 8b, 8c, 8d are the same distance from each other, and the code combination is determined by the presence or absence of a special blend of fibers on one or more separate areas within the bounding their control sections 8A, 8b, 8c, 8d. While located on one of the individual sections melange fiber in their controlled luminescent properties differ from melange fibers arranged at other sites. Shown in the figure 2 example, the document 1A provided with a heathered fiber types a and b only in some areas 7a, 7b, located within the control sections 8A, 8b, while the document 1b has a heathered fiber types a and D only in some areas 7a, 7d, located within the control sections 8A, 8d.

In accordance with this coding system was established in this case luminescense melange fibers of four types a, b, C and D, which differ in one or more of their luminescent properties and the presence or absence of which is controlled at specific checkpoints for important locations the x sites. If the presence of luminescing material having the desired fluorescent properties at a given control plot to match the logic state "1"and the absence of a suitable material to match the logic state "0", then using the above encoding, we can obtain 24-1=15 different carrier specific information code combinations represented in binary code.

In this case, when checking the document 1A by passing it along the line of measurement corresponding detector would register binary code combination consisting of binary digits 1100. For a document 1b binary code combination consists of the following sequence of binary digits: 1001.

It is obvious that the number of control areas, and the number of types of blend fibers can be varied arbitrarily. In addition to all the control sections can also be applied homogeneous blend of fibers with the same phosphor. The advantage of the latter option is possible to significantly simplify the design of the detector or sensor.

If, in contrast to the above, the encoding should be made even more complex, similar to the one shown in figure 1 variant implementation of the invention can optionally modifies the distance between the control plots.

When necessary to make the encoding more complex structure can be similarly shown in figure 1 advanced option to change the distance between the control plots.

When scanning a document, you can analyze any of the properties contained in heathered fibers phosphors, such as the wavelength or the decay time of the luminescence radiation.

Figure 3 for conducted on the basis of the wavelengths of the analysis shows the possible spectral distribution of wavelengths obtained for the above-described coding system, requires the use of a blend of fibers of four types a, b, C and D, which in this simplest case differ by at least a wavelength emitted by their fluorescent emission. According to the figure 3 chart emitted by the phosphor And radiation has a shorter wavelength than wavelengths emitted by the phosphors, C and D of the radiation. As shown in figure 3, emitted by each of the phosphors a, b, C and D fluorescent radiation lies in a very narrow band of wavelengths that is not overlapped with the bands of radiation used phosphors that allows you to uniquely identify each of these phosphors a, b, C and D. These phosphors also have a sufficiently high intensity of luminescence is eszencia, so when automatic control is provided by the reliable recognition and detection.

Figure 4 schematically shows a possible detection system (detection) and analysis of the coding or code combinations obtained by using phosphors, respectively melange fibers, line radiation which is presented in figure 3.

Usually checking banknotes takes place in the device for processing, in which banknotes with high speed moving conveyor system past the sensors. Figure 4 the direction of such movement proposed in the invention of the banknote 2 is indicated by arrow 11. If this bill passes the light source 12, the radiation of which by means of the optical system 13 is focused on the document. As the light source 12 when this source is used, the wavelength of which corresponds to a wavelength of excitation of the individual phosphors. If the wavelengths of excitation of the individual phosphors lie in different ranges of wavelengths, it may be appropriate to use as a light source a few of the exciting light sources, each of which emits light in the appropriate wavelength range of the excitation. When lighting is proposed in the invention of the document 2 at some stage, which according from what briteney are y melange fiber, in the last excited luminescence. Subsequently emitted by the phosphors radiation 14 luminescence, usually scattered, focuses another optical system 15 on the sensor (detector) 16. Such a sensor (detector) 16 preferably has a spectrometer with diode matrix, each of the diodes has a sensitivity to radiation of one wavelength 23a, 23b 23C, 23d (Fig 3).

When moving under represented in figure 4 of the measuring device shown, for example, on figa banknotes 1a c heathered fiber types a and b, the fluorescent radiation which is characterized by the presence figure 3 presents emission lines 23a, 23b, this fluorescent radiation is perceived by the measuring channels of the sensor (detector), scanning corresponding control sections 8A, 8b, 8C, 8d, and converted into signals shown in figure 5 of the form.

Figure 5 presents the characteristics of the signals I received in the respective melange fibers separate types a, b, C and D of the measuring channels, depending on time t. Limited dashed lines time slots 30A, 30b, 30C, 30d correspond to control sections 8A, 8b, 8C, 8d and conventionally denote measuring channels, each of which are expected to be obtained for each signal. When moving the banknote 1A under the sensor (detector) in the direction of p is the CTL 11 first illuminated control section 8d. Because this control plot melange fibers are absent, corresponding to this control section of the measuring channel does not perceive no signal in the time interval 30d. Since then melange fiber type are also missing, the corresponding measuring channel also does not perceive no signal. Only upon entering a coverage area of the sensor (detector) individual parcel 7b, respectively, the control section 8b transported banknotes corresponding measuring channel registers in the time interval 30b lying in the band 23b radiation phosphor Century. the above applies to the following separate section 7a, respectively, lying in the strip 23a signal recorded in the time interval 30A. If, as indicated above, the presence of fluorescent radiation 23a, 23b, 23C, 23d, registered in the corresponding time interval 30A, 30b, 30C, 30d, corresponds to the binary digit "1"and the absence of such radiation corresponds to the binary digit "0", then the received sequence is shown in figure 5 signals can be represented in the form of a code combination 1100.

1. Tamper-resistant paper having a blend of fibers of at least two types, which differ in their luminescent properties and form encoding or code combination,characterized in that there areat least two distinct separate section, each of which has melange fibers of only one type, and the encoding or code combination is formed due to the specific geometric arrangement of individual sections on anti-forgery paper and/or due to the presence or absence of a blend of fibers of a particular type.

2. Tamper-resistant paper having a heathered fibers, which have fluorescent properties and form encoding or code combination,characterized in thatthere are at least two distinct separate section featuring heathered fiber, while encoding or code combination is formed due to the specific geometric arrangement of individual sections on anti-forgery paper, both individual plots are the same melange of fiber.

3. Protected from falsification paper according to claim 1 or 2,characterized in thatwhat heathered fibers contain phosphors with a characteristic fluorescent properties.

4. Anti-forgery paper on p. 3,characterized in thatthe phosphors have a narrow spectral band of radiation.

5. Anti-forgery paper on p. 3,characterized in thatthat emitted by the phosphors emission lies outside ViDi the Oh region of the spectrum.

6. Anti-forgery paper on p. 3,characterized in thatthe phosphors are amplifying optical radiation materials that contain optically pumped light-emitting material, light-scattering centers and the transparent matrix material.

7. Anti-forgery paper on p. 3,characterized in thatthe phosphors are present in the amount of blend fibers.

8. Protected from falsification paper according to claim 3,characterized in thatwhat heathered fiber colored phosphors.

9. Protected from falsification paper according to claim 1 or 2,characterized in thatwhat heathered fiber made from a polymer material.

10. Protected from falsification paper according to claim 1 or 2,characterized in thatwhat heathered fibers are sealed in tamper-resistant paper in the process of its production.

11. Anti-forgery paper under item 1 or 2,characterized in thatwhat heathered fibers are sealed in tamper-resistant paper method Wilcox.

12. Protected from falsification paper according to claim 1 or 2,characterized in thatwhat geometric separate sections have the form of stripes.

13. Anti-forgery paper by p. 12 differenttopicswhat is the width of the strips is from 5 to 30 mm

14. Protected from falsification paper according to claim 1 or 2,characterized in thatthe density of the melange vololona individual plots ranging from 2 to 20 melange of fibers per square centimeter.



 

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