EP0860298A2 - Security paper - Google Patents

Abstract

The security paper material has a security strip (7) in a width of more than 2mm, embedded in the first paper layer (6) of a multi-layer paper structure, with openings in the paper surface for at least partial exposure of the strip on both sides. The first paper layer (6) is covered by at least one further paper layer (9), and they are bonded together. The second paper layer (9) has a thickness of 10-50% of the total thickness of the security paper (15), and pref. 20%. Also claimed is a mfg. process where the initial paper layer is formed conventionally, and the security strip is embedded in the paper while it sets into a paper material, with windows formed where the security strip is accessible. The security strip, with a width more than 2 mm, with a width selected for the holes formed on the side away from the rotary fourdrinier while giving a smooth and unbroken paper surface on the side of the paper towards the fourdrinier. At least one further paper layer is produced in parallel with the first stage, to be applied to the reverse side of the first paper layer, to be bonded together covering the openings in the first paper surface or give a defined shape. Similarly, a third paper layer is formed to cover the other side, to be followed by further finishing processes such as calendering, glue application, drying, etc.

Description

The invention relates to a security paper with a embedded security tape, which is so in paper is embedded that it is at least partially freely accessible and a method for its production.

For security papers such as banknotes, securities, Documents, ID cards etc. it is known as Security feature security elements in the form of Store threads, tapes or the like. Usually these threads or ribbons during manufacture of the paper into the paper. At The thread or the belt is in circular sieve plants the pulp is inserted and brought to the screen in such a way that an embedding in the fiber structure takes place. This storage process is well known and z. B. in EP-A1 0 279 880 (Crane) or EP-A1 0 492 407 (GAO).

Sometimes it is desirable that the security element so embedded in the security paper that there is at least one point on the security paper is exposed on the surface. Instructs the security element optically variable effects, so their Effect by at least partially exposing the Security elements increased considerably or in many Cases effective at all.

One way of such a so-called window security thread to insert into a document is out EP-A1 0 059 056 (portals) is known. The security element is thus on the paper sieve outside the pulp introduced that it is exalted on it Deliver, in the following text called humps comes to lie. In the places where the security thread lying on the humps, can rest on the Do not form paper on the side facing the screen, so that it exactly at these points in the paper that will be finished later is freely accessible.

It is known that the storage of a security thread is difficult in practice in so far as the sheet formation over and under the thread is hindered because the flow velocity in the area of the thread the pulp changed significantly in the direction of the sieve or is reduced. This affects the more the wider the thread to be stored. To be sufficient That is to guarantee good sheet quality Processes known from EP-OS 0 059 056 therefore use threads limited, the width of which does not exceed 1mm - 1.5mm.

To also embed wide security tapes enable, it is proposed in EP-PS 0 070 172 (portals) the thread after that described at the beginning embedding classical technology (sieve without hump), but special requirements for what is to be embedded To provide thread material. The film-like security tape is in certain, periodically repeating Partial areas designed to be liquid-permeable, so that in these areas unchanged at the Paper production a fiber deposit or sheet formation is possible, but in the impermeable areas Sheet formation is prevented. During embedding of such a security band thus form in Area of liquid impermeable zones areas in which the tape is freely accessible on one side.

Although with this procedure very wide bands in the paper is stored and accessible in window areas can be made, it turns out to be disadvantageous that the homogeneity of the tape is periodically determined by the intended perforations in the longitudinal direction always is interrupted again. This makes a special one Advantage of previous window security threads lost, which is that the optical effects of the tape (Negative writing, optically variable properties etc.) in Incident light can only be checked in the window areas Transmitted light but also those embedded in the paper Areas are recognizable. Is the security thread or the security tape is applied homogeneously in the longitudinal direction, so it is in transmitted light as a continuous bar recognizable and therefore easy to check. He points in that areas inhomogeneities embedded in the paper, this is how it differs when it comes to reflected light / transmitted light not very essential and is therefore only difficult to distinguish from angry imitations.

The object of the invention is now a security document propose a wide window security band is embedded, the security band in the document a uniform appearance in the Has incident and transmitted light as well as a method its manufacture.

This task is carried out by the Features specified claim 1 solved. The inventive Process aspects are the characteristic parts of claims 9 and 10.

The basic idea of the invention is that in known a security paper with window security thread is formed, in which the security thread but is deliberately so broad that inevitably a paper is created that is in the area of the security thread or security tape defects in the form of has arbitrary holes. Usually tried the expert in any case to such defects avoid. In the security paper according to the invention these defects are consciously accepted, to then correct them with one or two To combine or connect layers of paper in such a way that all imperfections from the additional layer (s) covered or brought into a defined form.

The invention is based on the surprising finding from that in the production of security papers with Window security threads are getting wider and wider when inserted threads or tapes from a certain Width of the band first on the side facing away from the sieve Side (back side) above the security band in the form of holes. With increasing The width and the width of the band increase Flaws without the same mistakes the side of the paper facing the screen (front) occur. Only step after increasing the width these mistakes on both sides at the same time. Elevated if the width of the security band continues, it is omitted in extreme cases in the area of the security band the sheet formation on both sides of the security band Completely.

If you experimentally determine the width of the Security tape the bugs on the back and down whatever width they also have on the front occur, you have the two limit values in which one in the simplest case when choosing the invention usable security tapes can move.

Experience has shown that there are first imperfections on the back from a width of about 1.5 - 2 mm. Without additional measures can now be taken on the rotary screen system with the usual mesh size of the sieve (approx. ... millimeters) and usual height of the humps (approx. ... millimeters) the width of the security band to about 4 - 5 mm increase before also missing spots on the front of the paper occur.

It is now the first time with the solution according to the invention possible that without special additional measures on the Circular screening plant to use security threads instead the previous 0.75 - 1 mm width is now up to can have about 4 mm. By additional enlargement the mesh size of the sieve (which with unchanged Fiber length is only possible within narrow limits) and change in height and shape of the humps further increases in width possible without errors occur on the front of the paper.

If even wider security tapes are to be used, is proposed according to a development of the invention, additionally in the edge area of the security band to provide liquid-permeable areas that are not visible in the finished paper. Through this Measure is impermeable even when the exposure is complete Band area still one on the edge area limited embedding and anchoring of the Band possible. Through these measures you now get even the possibility of security tapes of any width to be stored in the first paper layer so that it Extreme case in the middle of the security band of are continuously accessible on both sides.

Are the liquid-permeable edge areas on both sides provided along the security band and executed sufficiently wide, this is anchored Security tape so intensely arranged in both sides Layers of paper that the finished paper Detachment of the paper webs only under great mechanical Load is possible. Such security paper is therefore basically also without additional applied Layers of paper can be used. By applying The security paper can, however, add further layers of paper additionally stabilized and further in appearance to be changed. The second paper layer can Area of the security band also have window areas, in which the security band is then unchanged is accessible.

By applying additional on one or both sides Leave layers of paper with or without window areas produce security paper variants that differ from differentiate very clearly so far. Because of that wide security tapes receive the security papers a specific look that sets them apart from others clearly differentiates and that with modern ones Copiers are not to be copied.

The security paper according to the invention also has the Advantage that by using much wider Security tapes these, especially at the simultaneous use of windows, solely because of the larger area share much easier to check are. The larger area also allows more complex and complicated print images and optical Use effects, so that the imitation of such Security tapes is additionally difficult. There such security papers also on conventional ones Double circular paper machines can be manufactured is the use of the inventive method without large additional production costs or investments possible. When using special in Edge area permeable security threads There are also completely new possibilities in the design of the security papers, as now on very simple way on one or both sides over the whole Length of freely accessible security tapes in the security paper can be integrated. The accessibility this tapes can also be used if necessary Combination with one or two layers of paper, which are also congruent or mutually may have staggered windows, on one or both sides be prevented. By special arrangement of such Tapes in the multi-use paper web or by cutting the web / arches in the area of the belt can now even Security papers are made on a Edge made of transparent film material and only at a certain edge distance in the known fiber paper pass over.

Other advantages and advantageous developments are Subject of the subclaims and content of the description the invention with reference to the figure.

Fig. 1

die schematische Darstellung einer Doppelrundsieb-Papiermaschine zur Herstellung eines Sicherheitspapiers;

Fig. 2

eine Detaildarstellung des Rundsiebs mit Höckern zur Erzeugung von Fensterbereichen in der Papierbahn;

Fig. 3 - 5

Draufsicht und Schnittdarstellungen eines Sicherheitspapiers mit Fenstersicherheitsfaden;

Fig. 6

die schematische Darstellung eines Sicherheitsbandes mit flüssigkeitsdurchlässigem Randbereich;

Fig. 7

eine Detaildarstellung des Rundsiebs mit ringförmiger Erhöhung

Fig. 8

die Rundsieberhöhung der Fig. 7 mit aufliegendem Sicherheitsband (Schnittdarstellung);

Fig. 9

Draufsicht auf ein Sicherheitspapier mit durchgehendem Fensterbereich;

Fig. 10, 11

Schnitte CD des Sicherheitspapiers der Fig. 9;

Fig. 12

Draufsicht auf ein Sicherheitspapier mit eingebettetem Sicherheitsband und unterschiedlichen Fenstervarianten;

Fig. 13

Schnitt EF des Sicherheitspapiers der Fig. 12;

Fig. 14

Draufsicht auf ein Sicherheitspapier mit transparentem Kantenbereich;

Fig. 15

Schnitt GH des Sicherheitspaciers der Fig. 14;

Show it:

Fig. 1

the schematic representation of a twin circular paper machine for the production of security paper;

Fig. 2

a detailed view of the circular screen with bumps for creating window areas in the paper web;

3 - 5

Top view and sectional views of a security paper with window security thread;

Fig. 6

the schematic representation of a security tape with liquid-permeable edge area;

Fig. 7

a detailed representation of the circular sieve with an annular increase

Fig. 8

the round screen elevation of Figure 7 with overlying security band (sectional view).

Fig. 9

Top view of a security paper with a continuous window area;

10, 11

Sections CD of the security paper of Fig. 9;

Fig. 12

Top view of a security paper with an embedded security tape and different window variants;

Fig. 13

Section EF of the security paper of Fig. 12;

Fig. 14

Top view of a security paper with a transparent edge area;

Fig. 15

Section GH of the security package of FIG. 14;

Fig. 1 shows the schematic representation of a twin circular paper machine how to make Security paper is used. The facility exists from two circular screen paper machines 1 and 2, which over a take-off felt 3 are connected to one another.

In the paper machine 1 is a on the rotary screen 4 Paper web 6 is formed, in which a security band 7th is embedded. The security band 7 runs on Bump 5 of the rotary screen 4 before the assigned one Bump 5 or the respective screen area in the pulp 8 immersed in the paper machine. When doing this manufactured paper web 6 is the security band in an inner layer of the paper. In the Areas where it lies on the humps is that Security band 7, however, freely accessible. Production such paper webs 6 corresponds to the manufacturing process, as for example in EP-PS 056 059 is described.

By means of the paper machine 2 is parallel to the production the paper web 6 is made a second paper web 9, the homogeneous in the present example, d. H. without Window or the like. The paper web 9 is by means of the so-called take-off felt 10 from the rotary screen 11 removed, in the area of the pressure roller 12 with the paper web 6 connected and together with this the further processing stations (calender, paper sizing etc.) fed to the manufacturing plant.

Fig. 2 shows a detail of the circular sieve system 1, in which the described introduction of the security band 7 can be seen more clearly. Especially it is shown that in the areas where the Security tape 7 on the hump 5 rests, none Leaf formation is possible because of the intimate No contact between the safety band 7 and the hump 5 Can deposit fibers. Form these contact surfaces on the finished paper the window areas in which the Security band will be freely accessible later. The bumps 5 in the sieve 4 are usually essential made wider than the security band. This is the introduction of the security band within a wide tolerance range possible. Depending on the shape of the Hump 5 and their arrangement to each other in the Circumferential track of the rotary screen 4 are the number and location of the Window areas can be planned specifically in later paper.

As mentioned at the beginning, the sheet formation is in the area the security thread or security band from the Depends on the width of the security band, as that is usually the case liquid-impermeable tape 7 the drainage hindered by the sieve 4. The specialist is known that when using too wide security tapes Errors in the form of holes that can occur Expose the security band. Since the first mistakes already a width of about 1.5 mm are expected therefore usually security threads with a width used up to a maximum of 1 mm.

Closer investigations have now shown that in one Increase in security thread width not as expected on both sides of the security band, d. H. who the Sieve 4 facing side 13 and the side facing away from the sieve Page 14, errors in the form of holes occur at the same time. Surprisingly, the mistakes show up first on the back of the security band, d. H. in the Layer region 14 of the paper web occur. Only after the security bandwidth will increase significantly affects sheet formation in layer area 13 in such a way that there, in addition to those deliberately created Random holes appear in window areas. Increases one continues the width of the security band, so take number and size of holes on both sides of the Paper web continues until finally in the area of Safety tape on both sides of the sheet formation is completely prevented.

According to the invention in a first embodiment Security tapes are used, the width of which is so large is chosen that on the back of the later Security paper, d. H. in area 14 of the security band 7, defects in the form of holes occur such mistakes but not on the front, d. H. in area 13. Such security tapes preferably have a width of 2 mm - 4 mm.

If you cover the faulty back of the so produced Security paper with that in the second rotary screen generated paper web 9, is also in The area of the defects always has a minimum paper thickness present a homogeneous impression of the paper surface mediated. The errors in paper web 6 are hidden from the later viewer.

Fig. 3 shows a security paper with embedded Window security tape in top view. It has window areas 16 on and areas 17 where the security paper embedded in paper or covered by fibers is.

If one now assumes that that shown in Fig. 3 Security paper is a paper made by a conventional process Paper is "falsely" one Safety tape with a width of 4 mm embedded has, for example, in area 18 one Fault on that in Fig. 4 similar to the window area 16 exposes the security band.

5 shows the same section AB of the security paper, but with the stipulation that this security paper produced by the method according to the invention has been. In this embodiment, the flaw is 18 covered with the additional paper web 9. Paper web 6 and paper web 9 are different in FIG. 5 hatched, in the finished paper however, no separate layers of paper can be identified, since two shortly after the leaf formation merged paper webs in the following processing steps (Calendering, gluing, drying etc.) connect so intimately that a separation or no longer distinguish between the individual tracks is possible. By overlaying these two layers this creates the impression of a faultlessly manufactured one Paper web.

Fig. 6 shows a special embodiment of a Security tape 19, which is much wider than that originally defined security band is executed. This security band 19 is, for example, 20 mm or 30 mm wide. It has 20 liquid-permeable in the edge regions and ideally even fiber-permeable Areas on. In the middle area 21 that is Band 19 made liquid permeable.

Such a security band 19 can, for example be made of a film strip in the edge area permeable to liquid or fiber due to perforation have been done. Alternatively, however, is also a liquid or fiber permeable fabric tape can be used, that in the central area 21 by special impregnation or coating impermeable to liquids have been done.

Do you leave such a security band 19, as in Fig. 7 shown on a in the direction of rotation of the sieve considered, ring-shaped elevation 22 of the sieve 4, run up and one forms the annular elevation 22 so narrow out that the permeable edge areas 20 over the elevation 22 protrude (Fig. 8), so it will Security tape in impermeable area 21, as far as this rests on the ring, prevent leaf formation. In the protruding, permeable marginal areas 20 but it is embedded in the paper.

The result of doing this is a security paper, in which an extremely wide security band is embedded is in the central region 21 from both sides is freely accessible. The edge areas 20 are due the permeable structure firmly anchored in the paper. A such paper is in plan view in Figures 9 and 10 and reproduced in a sectional view.

11 shows the section of such security paper, one side with an additional Paper layer 9 is provided. This gives the security paper one-sided homogeneous appearance. On this On the side, it is like conventional security papers can also be printed on the entire surface.

On the other hand, the security paper is dated Security tape 19 interrupted. Assigns the security band holographic or other optically variable Effects on, it seems reasonable, these areas to be included in the print image only in the transition area. Has the security band only metallic shiny structures, each for themselves would be relatively easy to imitate, so it is recommended the security print image (steel gravure, guilloche pattern etc.) also to be provided in this area. On this way the metallic luster of the security tape combined with the security print image or with this firmly connected.

In the embodiment shown in Figures 12 and 13 is the security paper 23 on both sides with each connected to a further paper layer 27, 28. Both outer paper layers 27, 28 have in the area of Security tape window 16 on each other like this are arranged so that the security band once on both sides, once through a window only from the front and finally through another window just from the Back is accessible. One made in this way Security paper is double-sided like normal security paper to edit. In the relatively large area Window areas are all provided on the security band, very visually verifiable properties clearly accessible and therefore also without optical aids easy to check by everyone. That from Windows accessible from both sides allow provision of see-through features, e.g. B. in transmitted and reflected light Varying layers of color that protect against counterfeiting increase further.

14 and 15 is finally a security paper shown, in which the security band in Edge area is arranged. Like especially the cut GH can be seen, the security band 26 only anchored in the paper on one side. The making of a such security paper is possible, for example, by the security paper 25 in the to be manufactured Multi-use paper web is arranged such that the cutting line for the individual banknote tracks in runs through the middle of the security band. Alternatively it is also conceivable that the security band at the Paper production in the edge area of the cut lines provide that the protruding beyond the cut edge Area of the security band as a waste strip Will get removed. This embodiment has the advantage that the width of the film area must be adhered to more precisely is because the cutting lines are at the transition Can orient film / paper, but is disadvantageous the need for several on regulatory mechanisms cuts to be controlled. It also decreases with this procedure, because of the unusable Stripes in the separated edge area, the usable Area share of the paper web.

It is clear to the person skilled in the art that the mentioned embodiments are exemplary, and that beyond that Many other embodiments are conceivable build on the basic idea of the invention.

Claims (13)

Security paper with an embedded security tape, which is embedded in the paper such that it is at least partially freely accessible, characterized in that the security band (7, 19) has a width greater than 2 mm, the security paper is made of multiple layers, ie has at least two layers of paper that are produced on separate paper systems, the security band (7, 19) is embedded in the first paper layer (6) and is at least partially accessible on both sides through openings in the paper surface, and that the first paper layer (6) is covered with at least one second paper layer (9) and is firmly connected thereto, the second paper layer (9) having a thickness of 10 to 50%, preferably 20% of the total thickness of the security paper (15, 23, 25 ) having. Security paper according to claim 1, characterized in that the security tape (7, 19) is equipped with optically variable effects, in particular diffraction patterns, holograms or interference effects. Security paper according to claim 1, characterized in that the security tape (7, 19) is equipped with printed images, in particular negative or positive characters. Security paper according to claim 1, characterized in that the security tape (7, 19) contains a metal layer. Security paper according to claim 1, characterized in that the security tape contains fluorescent, in particular daylight fluorescent substances. Security paper according to Claim 1, characterized in that the paper webs (6, 9, 27, 28) have windows (16) in the region of the security band (7, 19). A method for producing a security paper according to claim 1, characterized in that in a first method step, in a manner known per se, a first paper web is formed, in which a security band is embedded in the paper during sheet formation, and windows are formed by likewise known measures, through which the security band is partially freely accessible, that a security band with a width of greater than 2 mm is used and the width is dimensioned such that defects occur in the form of holes at least on the side of the paper web to be formed in the area of the security band in the area of the security band in the form of holes, the side facing the sieve the paper web (front) still has a flawless surface, that at least a second paper web is formed parallel to the first method step, which is applied to the back of the first paper web and connected to it after completion of the first paper web, so that existing imperfections on the back are covered with this additional paper layer or brought into a defined shape, wherein the second paper web has a thickness of 10 to 50%, preferably 20% of the total thickness of the security paper, that in the same way a third paper web is optionally formed in parallel and connected to the other side of the paper web, and that Connect further process steps, such as calendering, gluing, drying, etc., to complete the paper in a known manner. Method according to claim 7, characterized in that the additional paper web (s) have window areas which are brought into register with the exposed areas of the security band. A method for producing a security paper according to claim 7, characterized in that the screen on which the first paper web is formed has bumps which are made narrower than the security band, and that the permeable areas of the security band protrude laterally beyond the bumps. Method according to claim 7, characterized in that the security band runs onto the screen outside the pulp. Method according to claim 7, characterized in that the elevation on which the security band runs is an elevated ring area of the screen. A method according to claim 7, characterized in that the security band is brought to the screen after about 30% of the sheet formation is completed. Method according to claim 7, characterized in that the additional paper webs (9, 27, 28) are made homogeneously.

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