CH696744A5 - Security paper and method for its production. - Google Patents

Security paper and method for its production. Download PDF

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Publication number
CH696744A5
CH696744A5 CH01184/03A CH11842003A CH696744A5 CH 696744 A5 CH696744 A5 CH 696744A5 CH 01184/03 A CH01184/03 A CH 01184/03A CH 11842003 A CH11842003 A CH 11842003A CH 696744 A5 CH696744 A5 CH 696744A5
Authority
CH
Switzerland
Prior art keywords
paper
security
fibers
characterized
range
Prior art date
Application number
CH01184/03A
Other languages
German (de)
Inventor
Jakob Grob
Klaus Franken
Juergen Mertins
Original Assignee
Landqart
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Landqart filed Critical Landqart
Priority to CH01184/03A priority Critical patent/CH696744A5/en
Publication of CH696744A5 publication Critical patent/CH696744A5/en

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/44Watermarking devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/06Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type
    • D21F11/08Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the cylinder type paper or board consisting of two or more layers
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply

Description

CH 696 744 A5

Description Technical area

The present invention relates to a method for producing a security paper and a security paper embedded in the mass security elements.

State of the art

Especially in the field of banknotes security features are very often introduced into the mass of the paper. To mention are i.d.R. metallized security strips, which are either completely embedded in the paper and thus are hardly recognizable in supervision and are perceived as a black strip, or which can occur in some areas on the surface and may additionally be provided with recessed letters, etc. Also important are so-called mottling fibers, i. fibers anchored in the bulk of the paper which are normally undetectable under ordinary lighting conditions, but which are e.g. when illuminated by UV light appear bright / colored (photoluminescence). Typically, such mottled fibers are colored with various photoluminescent dyes, so that on irradiation of light of appropriate wavelength mottled fibers appear in different colors.

Presentation of the invention

The invention is therefore based on the object to propose an improved security paper embedded in the mass security elements such as mottled fibers and to provide a method for its preparation. This for security elements, which are introduced via a slurry in the pulp.

The solution to this problem is achieved by using a method using two separately prepared paper webs, as set forth in claim 1. Concretely, the procedure is that a first paper web is formed, and that e.g. at least one second paper web is formed parallel thereto, wherein, during sheet formation, particularly preferably security elements slurried in the pulp are embedded in the mass of the second paper web. In this case, the second paper web typically has a thickness of 10% to 50% of the total thickness of the security paper. In a subsequent method step, the second paper web is then brought together with the first paper web and connected to it. This process preferably takes place in the wet area of a single paper machine, and the connection preferably takes place between wet paper webs.

Normally, it is the case that only mottled fibers, which are arranged in a certain near-surface area, actually make a recognizable effect, since fibers arranged deeper in the paper mass are covered by the mass. Accordingly, to achieve a comparatively modest effect, it is already necessary to mix mottling fibers in the pulp in a comparatively high concentration. Accordingly, the essence of the invention is to use the technology already known in the prior art to produce at least two paper webs next to each other often in parallel and then to join them together in the wet area of the paper machine, to use security elements slurried in the pulp, e.g. Melierfasern to arrange specifically only in one layer, which is manufactured separately and which is arranged at the finished security paper on the surface. On the one hand, surprisingly and unexpectedly, with the same efficiency, the high cost of the security elements can be reduced, or it can be reduced by using e.g. low mottling fibers are already produced very efficient effects, since the security elements such. Melierfasern are arranged substantially exclusively in a region of the security paper, which is effective for the effect. Moreover, it is thus possible to selectively arrange certain security elements such as mottled fibers only on one side of the security paper, which is not possible in typical prior art processes.

It is thus possible on the one hand, a thick first paper web only with a thin second paper web with security elements, i. E. e.g. Melierfasern to connect, and provide in the first paper web no security elements. Alternatively, it is possible to connect the first paper web on both sides with two thin paper webs and to provide security elements in these two thin second paper webs. A particularly impressive effect can thus be generated in particular if the second paper webs arranged on the different surfaces have security elements of different types, densities and / or distributions. In addition, very interesting effects can be produced by, for example, embedding other security features, such as watermarks, security strips, possibly exposed in regions (Windows method) in the first paper web. This results in a security paper, which has on the one hand a partially exposed security strip and shows only on the other side visible mottled fibers.

According to a first preferred embodiment of the method according to the invention, the bonding of the paper webs in the wet area of the same paper machine takes place by means of a greasing process which, e.g. can be realized by a simple deflection immediately after the merger of the wet webs around a roll. The two paper webs can in principle also be produced in different paper machines, and both long wire machines and round screening machines can be used. In particular, however, preferably round screen units are used for the production of both paper webs and the webs in the same paper machine in Nassbe2

CH 696 744 A5

richly connected. In addition, the thin paper layer with the security elements is preferably produced in a so-called short shaper or a short shaper, a round sieve unit in which the round sieve does not rotate in a tank with pulp but in which the pulp is applied via a cloth application unit, optionally with a squeegee the round screen is applied. Typically, the second paper web has a thickness of 10% to 30%, preferably 15% to 25% of the total thickness of the security paper.

As already mentioned, the security elements according to a further embodiment are preferably mottled fibers. Also possible, however, are taggants (markers acting as security elements or microscopic marking elements, such as planchettes, frequently called up converters), in general pigments or dyes which are effective as security elements.

The mottled fibers preferably have photoluminescent properties, in particular fluorescent or phosphorescent properties. The method proves to be particularly suitable, in particular, when the mottled fibers exhibit linearly polarized absorption and / or linearly polarized photoluminescence, in which case excitation by light substantially outside the visible range (UV, IR) is particularly possible and the observation or emission in the visible area happens. Good effects can be achieved if a dichroic ratio in the range of greater than or equal to 2, preferably greater than or equal to 5, is present in absorption and / or emission. In order to support the arrangement of the mottling fibers in the near-surface region in the most optically effective manner, according to a further preferred embodiment, the mottling fibers have an anisotropic cross-section, with the ratio of the short main axis of the cross section to the long main axis of the cross section in the range of 1 being particularly preferred : 1.5 to 1: 100, preferably in the range from 1: 2 to 1:50, particularly preferably from 1: 2 to 1:25 or even from 1: 8 to 1:15. Such anisotropic cross-sectioned mottled fibers tend to have their long major axis substantially parallel to the surface of the paper, thus exhibiting improved effects. In combination with the inventive method of arranging such fibers exclusively in the near-surface region so amazing effects can be generated. Typically, the mottling fibers have a length of less than 10 mm, preferably in the range of 1 to 5 mm, particularly preferably in the range of 3 or 3.5 mm. The mottled fibers normally have a diameter in the range of 20 to 150 μm, more preferably in the range of 50 to 100 μm, with anisotropic cross section preferably the short major axis having a length in the range of 5 to 20 μm and the long major axis a length in the range of 50 to 150 ym.

The mottled fibers may be made of different material, which material should have the property of anchoring well in the paper matrix. In the area of bank notes, a paper matrix with a high percentage of cotton is typically used. Accordingly, the mottled fiber may be synthetic fibers selected from the group consisting of polyethylene, polypropylene, aramid, polyamide, polyacrylonitrile (these materials should have a hydrophilic surface for incorporation into the paper, which may be realized via chemical modification of the surface can be), or based on natural or partially synthetic materials based fibers selected from the group of wood, cotton, grass, cellulose, viscose, lyocell, rayon. Alternatively, metal-based fibers are also possible (metal fibers). A mixture of fibers of different materials is possible. In this case, the fibers are dyed, for example, with a photoluminescent dye and optionally subsequently stretched to give rise to the property of polarizing absorption or emission (the dyes must have the property of aligning themselves during stretching of the fiber in such a way that the desired polarization effect occurs). ,

Further preferred embodiments of the inventive method are described in the dependent claims.

Furthermore, the present invention, as already mentioned above, relates to a security paper with embedded in the mass, in particular optically verifiable, and introduced via slurry in the pulp security elements. The security paper is according to the invention characterized in that the security elements, in particular mottled fibers, are arranged in at least one near-surface region, said near-surface region accounts for 10% to 30%, preferably 15% to 25% of the total thickness of the security paper. The near-surface region can be provided by a separate layer. Preferably, such a security paper can be produced or produced by a method as described above. In this case, the security element is particularly preferably provided as a photoluminescent mica fiber introduced via the pulp, which in particular exhibits linearly polarized emission and / or absorption. In the method described above resp. the security paper, the security elements are embedded over the entire width on one side in the paper web. Alternatively, however, it is possible to use these elements only in subregions, such as e.g. To embed strips in the paper.

Further preferred embodiments of the inventive security paper are described in the dependent claims.

Brief explanation of the figures

The invention will be explained in more detail with reference to embodiments in conjunction with the drawings. Show it:

3

CH 696 744 A5

1a) is a schematic representation of the wet area of a paper machine with a possible process structure for producing a security paper,

Fig. 1 b) is a schematic representation of another possible process structure for producing a security paper; and

Fig. 2 sections through security papers with embedded security elements, wherein in

Fig. 2a) the security elements are arranged exclusively on one side, in

Fig. 2b) the security elements are arranged compressed on both sides, in

2c) additional security elements are additionally present,

Fig. 2d) and security elements are arranged on both sides.

Ways to carry out the invention

Fig. 1 shows a schematic representation of a paper machine with two round-screen units, in which two paper webs 6 and 13 are produced in two rotary screening units 1 and 8 in parallel and synchronously in the wet area. Compared to a paper machine with only one round screen, such double-round screen paper machines have the possibility of a faster production with simultaneously high quality of the produced paper. In particular, in the field of production of paper for banknotes find such machines application, firstly, because of banknotes paper of very high quality and special nature is required, and secondly, only round screen paper machines allow the production of finely detailed multi-level watermark, which are as security features in banknotes still have a very high priority.

A first paper web, which typically represents the thicker paper web, i. At least 50% of the total thickness of the resulting paper, usually even in the region of 80%, is built up on the first round screen unit 1 using the first round screen 2. In this case, the round screen 2 is immersed in the pulp A and the inner portion of the rotating round screen has a lower liquid level, so that liquid of the pulp A is pressed through the screen 7 and concentrates accordingly on the outside of the screen 7, the fiber content of the pulp and the Sheet is formed. The first paper layer 6 produced on the first round screen unit 1 is made of a pulp A without mottled fibers, i. the first paper web or paper layer 6 does not have mottled fibers.

This first paper layer 6 is then in that area of the first screen 7, which protrudes from the pulp A, via a pickup 3 (also referred to as pick-up felt) received on a roller 5 from the screen 7 and together with the take-off screen (reference numeral 4th ) dissipated. In order to prevent the guided on the underside of the take-off screen 4 train peels off, a suction head 18 or overhead suction can be arranged, which holds the web 6 on the wire 4. The suction head 18 can take over a dewatering function in addition to the holding function.

At the same time a second paper layer 13 is prepared in an analogous manner using a second round screen 8 with a second screen 11 in the second round screen unit 8. However, this second paper layer 13 is now thinner than the first paper layer 6, typically making up about 10 to 20% of the total thickness of the resulting paper 12. In particular, however, the pulp B used in the second round sieve unit is mixed with mottled fibers, which results in that the second paper layer 13 contains these mottled fibers in the mass. The concentration of mottled fibers in the pulp B is comparatively high, but since only a thin paper layer 13 is produced and, accordingly, the mottled fibers are arranged selectively on the surface of the resulting paper 12, the costs can nevertheless be kept low.

This second paper layer 13 is then brought into the region of the second screen 11, which protrudes from the pulp B, with the arranged on the pick-up screen on the bottom first paper web 6 on the roller 10 into contact and brought together. The roller 10, around which the two webs are led around at least about 120 °, thus acts as Gautschrolle. Subsequently, the laminate thus produced respectively resulting security paper 12 is discharged. Optionally, this security paper 12 can then be pressed between further rollers (not shown) and further gummed, and there is such an intimate connection between the two paper layers that the different paper layers can hardly be distinguished from one another in the finished security paper. In addition, the security paper 12 is then dried in the dryer section of the paper machine and usually provided with sizing or feeds in the coating section of the paper machine. This can be done either inline or on a separate coater.

In connection with the two round screen units it must be noted that in principle the two units 1 and 8 can also be reversed in their order, i. that on the one hand the thinner second paper layer can be produced with mottled fibers and on the other unit the thicker first paper layer. Which round screen is used for which function, for example, can be made dependent on which

4

CH 696 744 A5

Layer if necessary, additional security features such as watermarks or security threads to be installed, and which round screen is already prepared for such installation.

Fig. 1b) shows an alternative construction in the wet end of a paper machine. This is on a first round screen unit, which here as a so-called Kurzformer or in professional circles and English Shortformer 25 used to produce the second thin paper web. Such Kurzformer 25 does not rotate in a bath of pulp, but the pulp B with mottled fibers is applied via a cloth application unit 21. This cloth application unit 21 is designed to be movable, and the concerns on the round screen can be adjusted via a hydraulic cylinder 19. The fabric application unit 21 applies the pulp only shortly before the take-off screen 3 (e.g., spraying), i. the actual sheet formation happens only in a small angular range of rotation of the round screen 11. Since in this step, however, only a thin paper layer should be formed anyway, this is not detrimental. In the cloth application unit 21, e.g. the substance (pulp) is to some extent sprayed or sprayed on and / or a squeegee is provided, for example.

The thin first paper web 13, which is produced by the Kurzformer 25, then tapped off the pickup 3, and thus does not begin to detach the paper web down from the wire 3 (sag at too high basis weight), a suction head 18 on the Be provided top of the take-off screen. This suction head 18 can also take over a drainage function.

In the other round screen unit 1, the stronger paper web 6 is constructed. This first round sieve unit 1 has a bath in which the pulp A is held and in which the round sieve 7 rotates. In addition, it is shown in FIG. 1 b) how a security thread 15 is guided over the round wire 7 via a roller 23 via a thread feed unit 22. The tape is then during sheet formation on the wire 7 and is embedded in the sheet. Optionally, a structure of bumps may be provided on this screen 6, as described in EP-A-0 059 056, so that the security thread is subsequently partially embedded and partially exposed in the web.

The thin paper web 13, which is supplied together with the pick-up felt 3 while still wet, is then merged with the still wet paper web 6 and strongly deflected over the roller 10, so that already in this diversion around the roller 10 of the Gautschvorgang expires. The security paper 12 can then be guided through further units of the paper machine, such as drying unit, calender, coating units, etc.

2 now shows sections through different embodiments of a security paper produced in this way. In Fig. 2a, the simplest form is shown. The security paper 12 has the first paper layer 6, which contains no mottling fibers 14. Associated with this is the second paper layer 13, which is substantially thinner than the first paper layer 6, and which contains mottle fibers 14. The individual paper layers 6 and 13 can, if the paper layers are combined and gummed in the wet area of the paper machine, essentially no longer be distinguished from each other in the finished security paper (therefore the dividing line between the two layers 6 and 13 is shown in broken lines). It can be seen that the mottled fibers 14 are selectively located in a thin near-surface region, and thus substantially as good as any mottled fibers 14 used can give rise to an optically perceptible effect.

It should be noted that also the first paper web 6 can contain mottled fibers, but for example in a lower density, and it is e.g. it is possible to provide in the thinner paper layer 13 high-quality mica fibers (for example those with photoluminescence and with linearly polarized absorption and / or emission) and in the thicker paper layer 6 no mottling fibers or simple inexpensive mottled fibers. For example, it is advantageously possible to use identical mottled fibers in the paper layers per se at first glance and without polarizer, but the mottled fibers arranged in the thinner paper web 13 additionally exhibit polarization effects. When viewed without a polarizer in UV light so both sides of the security paper 12 appear identical, but is irradiated, for example, UV light with a rotating polarization direction (linearly polarized absorption of Melierfasern), or by a rotating polarizer observed (linearly polarized emission of mottled fibers) appears the side of the first paper web 6 without particular effect, while the side of the second paper web 13 shows a flip-flop effect of the mottled fibers, depending on the relative orientation of the polarization direction of the fiber or the polarization direction of the incident light or the polarization direction of the polarizer for observation.

A possible mottled fiber consists for example of lyocell as a matrix material, is dyed with a fluorescent dye such as Blankophor P (Bayer, Leverkusen), or Pergasolgelb 8GA (Ciba Specialty Chemicals) and has a length of: 2.5 mm at 17 dtex; or a length of: 4 mm at 6.7 dtex. These are either stretched fibers in which dyes are anisotropically incorporated during dyeing and thus polarization effects are possible, or the fibers are extruded using a colored mass and then stretched matrix and dye of the extrudate, so that orientation of the dyes occurs.

In the method described above, the security elements are embedded over the entire width in the paper web. In principle, it is also possible not to introduce the mottled fibers over the entire width of the paper web in the layer 13, but only in certain areas. For example, it is possible to perform a so-called Streifenmelierung in which Melierfasern 14 along the direction of the paper web vorhan5 only in certain strips

CH 696 744 A5

are, and depending on the strip in different stripes different Melierfasern 14 can be introduced.

This localization of the mottled fibers in strips can be achieved, for example, by not applying the same substance in the shaper 25 over the entire width of the paper web. For example, when spraying the fabric onto the round wire, only individual nozzles containing mordant fibers may be applied and / or it is possible to apply the fabric in the region of the fabric application unit 21 via e.g. Partitions or similar means in direction transverse to the direction of compartmentalization, so that areas arise in which pulp is applied without mica fibers, and other areas in which pulp is applied with mica fibers. Of course, it is also possible to provide contiguous areas with pulps of different Melierfasem.

Analogous is possible in a structure according to FIG. 1a), in which case the pulp B must be compartmentalized. One possibility of selectively introducing (for example in strips) mottled fibers in a structure according to FIG. 1 a) is, in the immersion region (see the position of arrow in FIG. 1 a)) in the regions in which strips of mottled fibers are to be formed, respectively to provide an auxiliary casserole. This auxiliary casserole (a device for applying pulp to the round sieve, for example similar to the device 21 from FIG. 1b)) is fed from a container in which pulp with slurried mottling fibers is present. The pulp B is then for example not mixed with mottled fibers in this particular case. The auxiliary casserole now applies pulp with mottled fibers to the round sieve 11 in one area. Depending on the width of this auxiliary casserole, a strip of mottled fibers is produced accordingly. It can be provided side by side for the production of several strips and several such auxiliary casserole devices.

Subsequently, by the rotation of the round screen of this area in which the auxiliary casserole applies the special pulp, passed through the pulp B and thereby the entire paper web is formed and thus this area covered on the back of pulp B without mottled. Thus, strips form, in which selectively Melierfasern from the pulp of the auxiliary casserole are included.

Incidentally, such an auxiliary bake can also be formed over the entire width of the paper web. In this way, then Melierfasern in enriched form in the near-surface region, which rests on the production on the round screen arranged. It must be noted in this connection that this use of an auxiliary headbox for the selective application of pulp with mottled fibers in an early stage of sheet formation (both in the form of strips and over the entire width of the paper web) is also independent of the use of a second (round -) Siebes can apply and owns for itself new and innovative character. It can also be produced using only a round screen paper, which on the one hand (in the production of the round screen facing) contains mottled fibers, as they are introduced from the auxiliary casserole, and on the other side (facing away from the round screen during production) either does not contain mottled fibers or, for example, another type of mottled fibers which are slurried in the pulp into which the round screen dips.

An alternative embodiment is shown in Fig. 2b), here are on both surfaces of the first paper web 6 thinner second paper webs 13 and 13 'are arranged, which each contain mottling fibers 14. It is particularly advantageous if different mottling fibers or the same mottling fibers are arranged in different distribution or density in the two paper webs 13 and 13, respectively, so that the resulting security paper has different properties on different sides. This can be used beneficially as another level of security.

Moreover, it is quite generally possible to provide, so to speak, "hidden" mottling fibers, e.g. in Fig. 2b) are arranged only in the layer 6 mottled fibers, and the two outer layers are free of mottled fibers 14. In this case, therefore, only the middle layer contains mottled fibers.

The embodiment according to FIG. 2c) serves, in particular, to illustrate that further security features can be arranged in the mass of the security paper 12. Examples include security threads 15 or watermarks in question. In this specific case, a security thread 15 is arranged here in the first paper web 6, and this security thread is partially exposed on the surface facing away from the thin paper layer 13 with mottled fibers. The embedding in the mass of the first paper web 6 can be carried out on the first wire 7, as described in EP-A-0 059 056, and as shown in Fig. 1b).

To further increase the effect on the side of the thin paper layer 13, mottling fibers 14 with anisotropic cross-section may be used, in which case the fibers preferably align with their broad side parallel to the paper surface and thus have a clearer visibility.

Fig. 2d) also shows an embodiment in which both the first layer 6 and the second layer 13 Melierfasern 14 has. The mottling fibers 14 'in the first, thicker layer 6 are cheap, simple mottling fibers, since in order to achieve any effect, a large amount of such mottling fibers must be provided in the pulp A during the production process. On the other side, in the thin layer 13, other mottling fibers 14 are arranged, which may have special properties, and in particular may be present, for example, at a substantially higher density.

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CH 696 744 A5

The mottled fibers may include qualitative information, but may equally represent quantitative information, for example by being arranged in a particular arrangement or density in the mass.

The proposed security paper can be used in addition to the function as a paper for a banknote, for example, as a paper for bonds, checks, stock certificates, tickets, billets or other securities, but there are also uses in the field of packaging materials, cover materials, labels, price tags , Tags etc. possible where a verification of authenticity is desirable.

LIST OF REFERENCE NUMBERS

[0040]

1

first round sieve unit

2

first round sieve

3

Abnahmesieb

4

Pick-up screen with first paper layer

5

role

6

first paper layer

7

Surface (sieve) of the first round sieve

8th

second round sieve unit

9

second round sieve

10

Roll, Gautschrolle

11

Surface (sieve) of the second round sieve

12

Security paper web

13

second paper layer

14

Security element, mottled fibers

15

security thread

16

uncovered area of 15

17

embedded area of 15

18

suction head

19

hydraulic cylinders

20

Axis of 21

21

Fabric application unit of 25

22

Yarn feeding unit

23

role

24

Pick-up screen with second paper layer

25

Short shaper, short shaper

A

Pulp without mottling fibers

B

Pulp with mottled fibers

Claims (13)

    claims
  1. Method for manufacturing a security paper (12), characterized in that a first paper web (6) is formed so that at least one second paper web (13) is formed, wherein during the formation of a sheet in the pulp (B) slurried security elements (14 ) are embedded in the mass of the second paper web (13), and wherein the second paper web (13) has a thickness of 10% to 50% of the total thickness of the security paper (12), and that in a subsequent process step, the first paper web (6) is merged with the second paper web (13) and connected to this.
  2. 2. The method according to claim 1, characterized in that the bonding of the paper webs (6,13) in the wet area of the paper machine is done by a Gautschvorgang and that particularly preferably for the production of the first and / or the second paper web (6,13) a Rundsieb- Unit (1, 8) is used.
  3. 3. The method according to any one of the preceding claims, characterized in that the second paper web (13) has a thickness of 10% to 30%, preferably from 15% to 25% of the total thickness of the security paper (12).
  4. 4. The method according to any one of the preceding claims, characterized in that it is at the security elements (14) to Melierfasern, Taggants acting as security elements pigments or dyes, and / or planchettes.
  5. 5. The method according to claim 4, characterized in that the mottled fibers (14) have photoluminescent properties, in particular fluorescent or phosphorescent properties.
  6. 6. The method according to any one of claims 4 or 5, characterized in that the mottled fibers show linearly polarized absorption and / or linearly polarized photoluminescence, wherein particularly preferably the excitation by light outside the visible range (UV, IR) is possible and the observation respectively Emission in the visible
    7
    CH 696 744 A5
    Area happens, and wherein particularly preferably in the absorption and / or emission a dichroic ratio in the range of greater than or equal to 2, preferably greater than or equal to 5 equal to 10 is present.
  7. 7. The method according to any one of claims 4 to 6, characterized in that the mottling fibers (14) have an anisotropic cross section, wherein particularly preferably the ratio of the short major axis of the cross section to the long major axis of the cross section in the range of 1: 1.5 to 1: 100 , preferably in the range from 1: 2 to 1:50, particularly preferably from 1: 2 to 1:25 or even from 1: 8 to 1:15.
  8. 8. The method according to any one of the preceding claims 4 to 7, characterized in that the mottling fibers (14) have a length of less than 10 mm, preferably in the range of 1 to 5 mm, particularly preferably in the range of 3 or 3.5 mm, and that the mottled fibers (14) have a diameter in the range from 20 to 150 μm, particularly preferably in the range from 50 to 100 μm, the anisotropic cross section having the short main axis a length in the range of 5 to 20 μm and the long main axis a length of Range of 50 to 150 ym.
  9. 9. The method according to any one of claims 4 to 8, characterized in that it is the mottled fiber (14) synthetic fibers selected from the group polyethylene, polypropylene, aramid, polyamide, polyacrylonitrile or based on natural or partially synthetic materials fibers selected from the group consisting of wood, cotton, grass, cellulose, viscose, lyocell, rayon, wherein the fibers (14) are particularly preferably dyed with a photoluminescent dye and optionally stretched.
  10. 10. The method according to any one of the preceding claims, characterized in that the second paper web (13) is produced in a Kurzformer (25), in which particularly preferably the substance (B) via a cloth application unit (21) is applied.
  11. 11. Security paper (12), produced by a process according to one of claims 1 to 10, embedded in the mass, in particular optically verifiable, and on slurry in the pulp (B) introduced security elements (14).
  12. 12. Security paper (12) according to claim 11, characterized in that the security elements (14) in at least one near-surface region (6) are arranged substantially exclusively or at least compressed, said near-surface region (6) 10% to 30%, preferably 15% to 25% of the total thickness of the security paper (12).
  13. 13. Security paper (12) according to claim 11 or 12, characterized in that the security element (14) is a introduced via the pulp photoluminescent mica fiber with linearly polarized emission and / or absorption.
    8th
CH01184/03A 2003-07-07 2003-07-07 Security paper and method for its production. CH696744A5 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CH01184/03A CH696744A5 (en) 2003-07-07 2003-07-07 Security paper and method for its production.

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CH01184/03A CH696744A5 (en) 2003-07-07 2003-07-07 Security paper and method for its production.
PCT/CH2004/000425 WO2005003458A1 (en) 2003-07-07 2004-07-06 Security paper and method for the production thereof

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FR2891848A1 (en) * 2005-10-06 2007-04-13 Banque De France Method for manufacturing a fibrous sheet having localized fibrous material contributions
FR2897078B1 (en) 2006-02-09 2011-08-19 Arjowiggins Sheet material comprising at least one watermiline with a colored nuance.
FR2904835B1 (en) 2006-08-08 2010-03-19 Arjowiggins Relatively small format safety elements comprising a through hole and sheet comprising same
FR2918679B1 (en) 2007-07-11 2017-12-01 Arjowiggins Licensing Sas Method for manufacturing sheet material
DE102010034693A1 (en) * 2010-08-18 2012-02-23 Giesecke & Devrient Gmbh Method for producing a security paper and round screen for it
DE102012212529A1 (en) * 2012-07-18 2014-01-23 Voith Patent Gmbh Security paper-flow system
FR2995114B1 (en) 2012-09-03 2015-09-04 Arjowiggins Security Method for authentication from the content of bio-sourcee material

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EP0059056A1 (en) * 1981-02-19 1982-09-01 Portals Limited Method for making a fibrous sheet
EP0229645A1 (en) * 1986-01-16 1987-07-22 GAO Gesellschaft für Automation und Organisation mbH Process for producing an antifalsification paper with an incorporated security element
EP0625431A1 (en) * 1993-05-01 1994-11-23 Giesecke & Devrient GmbH Security paper
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GB2309710A (en) * 1994-11-03 1997-08-06 Arjo Wiggins Sa Concentrations of security elements, and method for making same
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EP0987662A2 (en) * 1998-09-19 2000-03-22 Meto International GmbH Method for producing security elements for the electronic protection of articles
WO2000015903A1 (en) * 1998-09-11 2000-03-23 Companhia Suzano De Papel E Celulose Process for making cardboard having safety means
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EP0059056A1 (en) * 1981-02-19 1982-09-01 Portals Limited Method for making a fibrous sheet
EP0229645A1 (en) * 1986-01-16 1987-07-22 GAO Gesellschaft für Automation und Organisation mbH Process for producing an antifalsification paper with an incorporated security element
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EP0625431A1 (en) * 1993-05-01 1994-11-23 Giesecke & Devrient GmbH Security paper
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WO2000015903A1 (en) * 1998-09-11 2000-03-23 Companhia Suzano De Papel E Celulose Process for making cardboard having safety means
EP0987662A2 (en) * 1998-09-19 2000-03-22 Meto International GmbH Method for producing security elements for the electronic protection of articles
WO2000019016A1 (en) * 1998-09-25 2000-04-06 Landqart Antifalsification paper and other antifalsification items
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