EP3411525B1 - Method and device for producing a security paper having two window security elements - Google Patents

Description

The invention relates to a method and an apparatus for producing a security paper with at least two endless, on opposite sides of the security paper visible window security elements. The invention also relates to a corresponding multilayer security paper and document of value.

Security papers or documents of value are often provided with security features, such as watermarks, embedded security threads and the like, which permit verification of the authenticity of the security paper or value document and which at the same time serve as protection against unauthorized reproduction.

In the past, authenticity features that can only be introduced into the security paper during production, such as watermarks, chemically reacting additives, mottled fibers or security threads that are completely or partially embedded in the security paper, have proven to be very effective. In this case, security threads which are neither completely applied to a surface of a security paper nor completely embedded in the security paper are referred to as window security threads. These are partially embedded in the security paper so that they are visible on one or both opposite surfaces of the security paper only in certain areas of the window.

From the document WO 2005/052249 A1 For example, a method for producing a security paper is known. A security thread is embedded in a paper machine with a round screen between two paper layers. The Rundsieb has bumps to form windows in a paper layer, so that in the area of the bumps the security thread is exposed on one side of the security paper.

Based on this, the present invention seeks to provide a simple and inexpensive method for producing a security paper of the type mentioned. The method is intended in particular to produce security paper with advantageous properties, in particular with an improved process capability in terms of a good flatness and also give the designer a great deal of creative freedom. The invention is also intended to provide a corresponding device as well as a corresponding multi-ply security paper and value document.

• in einer ersten Papierlagenerzeugungsvorrichtung eine erste Papierbahn gebildet wird und dabei bei der Blattbildung ein erstes endloses Sicherheitselement als Fenstersicherheitselement in die erste Papierbahn eingebracht wird,
• in einer zweiten Papierlagenerzeugungsvorrichtung eine zweite Papierbahn erzeugt wird,
• die zweite Papierbahn so mit der ersten Papierbahn zusammengeführt und fest verbunden wird, dass das erste endlose Sicherheitselement in Fensterbereichen der ersten Papierbahn frei zugänglich ist,
• beim Zusammenführen der Papierbahnen ein zweites endloses Sicherheitselement zwischen die erste und zweite Papierbahn eingebettet wird, und
• mittels einer Saug- und/ oder Spülvorrichtung aus der zweiten Papierbahn in noch feuchtem Zustand Papierfasern entfernt werden, so dass das zweite endlose Sicherheitselement in Fensterbereichen der zweiten Papierbahn frei zugänglich ist.

According to the invention, in a method for producing a security paper having at least two endless window security elements visible on opposite sides of the security paper, it is provided that

• a first paper web is formed in a first paper layer production device, and a first endless security element is introduced into the first paper web as a window security element during sheet formation;
• a second paper web is produced in a second paper web production device,
• the second paper web is brought together with the first paper web and firmly connected so that the first endless security element is freely accessible in window regions of the first paper web,
• when merging the paper webs, a second endless security element is embedded between the first and second paper web, and
• paper fibers are removed by means of a suction and / or rinsing device from the second paper web in a still moist state, then the second endless security element is freely accessible in window regions of the second paper web.

For the purposes of the invention, the term "security paper" here refers to the unprinted paper, which is usually in quasi-endless form and is further processed at a later time. The security papers are used in particular for the production of value documents. In this case, a "document of value" is a document that has been completed for its intended use. Value documents within the meaning of the present invention are, in particular, bank notes, shares, bonds, certificates, vouchers, checks, high-quality admission tickets, but also other papers which are subject to counterfeiting, such as passports and other identification documents, as well as product security elements such as labels, seals, packaging and the like. The simplified term "security paper" or "value document" below includes all such documents and product security means.

The security paper is preferably multi-layered and comprises at least one layer of paper. The further layer or further layers may likewise be made of paper, but also of other materials, for example by plastic films. The paper or a paper layer particularly preferably comprises cotton fibers, as used for example for banknotes.

For the purposes of the invention, a paper-layer-producing device is a device, in particular a sheet-forming unit, for producing a paper web. The paper sheet producing apparatus may be a rotary screen machine, in particular a countercurrent rotary screen machine, a DC round screen machine or a twin round screen machine, act. Furthermore, a paper sheet producing apparatus may be a fourdrinier machine. The paper web output from the paper sheet forming apparatus is preferably output as a continuous paper. Alternatively, a sheet of paper could be issued. Furthermore, the paper-web-forming device may comprise a nozzle for dispensing a pulp mass onto a screen unit, for example a screen or a wire, whereby a paper web is produced.

The endless security elements of the present invention may in particular be formed by security threads or wide security bands. While security threads have a width of less than 4 mm, usually less than 2 mm, and typically about 1 mm, endless security elements with a width of 4 mm or more are referred to herein as security bands. The safety bands may in particular have a width of 4 mm to 20 mm, sometimes even up to 30 mm. Although the invention is explained below mainly by the example of narrow security threads, it is always understood that the security elements can also be formed by wide security bands. The embedding of wide security tapes in papermaking, for example, in the document EP 0625 431 described.

The endless security element can be, for example, a security element with a color shift effect, with a diffraction structure such as a hologram, with a dynamic effect, with an optionally partially recessed metallization, and / or with a printed image.

The above-mentioned window areas of the second paper web arise straight through the removal of the paper fibers from the second paper web. In an advantageous variant of the invention, the paper fibers are removed from the second paper web prior to merging with the first paper web. The paper fibers are advantageously removed in the register to the embedding position of the second endless security element.

For the first and second endless security element security elements with different optical appearance are advantageously used, for example, each one security element with color shift effect, with a diffraction structure such as a hologram, with a dynamic effect, with an optionally partially recessed metallization, or with a printed image. If more than two endless security elements are introduced, preferably all introduced security elements have a different visual appearance.

The second endless security element is advantageously embedded with an offset to the first endless security element that is more than twice the width of the widest embedded security element. In this way, the total thickness of the security paper is not excessively increased by the embedding of the security elements. The endless security elements can also be uniformly distributed over the security element, for example by the security elements are arranged symmetrically to the center line of the isolated security paper. By a uniform distribution of the security elements, a particularly uniform paper thickness and a particularly good flatness of the security paper or the value document generated therefrom can be achieved.

In other designs, especially in anyway thicker security papers such as those used for high-quality tickets, the endless security elements can be arranged one above the other without offset his. As a result, additional visual effects can be realized in the security paper, which are not or not readily possible with a security element alone. In this case, three or more endless security elements can be introduced into the security paper, for example by several or more second paper webs are connected to the first paper web.

The first paper web can be provided with at least one further security feature, which is advantageously in register with the window regions of the first paper web. Alternatively or additionally, the second paper web can be provided with at least one further security feature, which is advantageously in register with the window regions of the second paper web. As further security features, for example, watermarks, recesses or printed elements come into consideration.

In an advantageous development of the method, it is provided that the window regions of the first and second paper webs are formed differently, in particular have different shapes and / or sizes.

It is understood that more than one second paper web can be produced in the manner described and connected to the first paper web or the other second paper webs. For example, in the above-mentioned method, a third paper web can be additionally produced in another paper-web-forming device, and the third paper web can be brought together and firmly joined to the first and second paper webs, wherein when the paper webs are merged, a third endless security element is embedded between the second and third paper webs becomes. By means of a suction and / or flushing device can thereby Paper fibers are removed from the third paper web while the state is still wet, so that the second and third endless security elements are freely accessible in window regions of the third paper web.

• einer ersten Papierlagenerzeugungsvorrichtung zum Bilden einer ersten Papierbahn und zum Einbringen eines ersten endlosen Sicherheitselements als Fenstersicherheitselement in die erste Papierbahn bei der Blattbildung,
• einer zweiten Papierlagenerzeugungsvorrichtung zum Erzeugen einer zweiten Papierbahn,
• einem Abnahmesieb, welches auch als Abnahmefilz oder Abnahmeband verstanden werden kann, zum Zusammenführen und festen Verbinden der zweiten Papierbahn mit der ersten Papierbahn,
• einer Einrichtung zur Zuführung eines zweiten endlosen Sicherheitselements zwischen die erste und zweite Papierbahn beim Zusammenführen der Papierbahnen, und
• einer Saug- und/ oder Spülvorrichtung zum Entfernen von Papierfasern aus der zweiten Papierbahn in noch feuchtem Zustand.

The invention also includes an apparatus for producing a security paper having at least two endless window security elements visible on opposite sides of the security paper

• a first paper layer producing device for forming a first paper web and for introducing a first endless security element as a window security element into the first paper web during sheet formation,
• a second paper layer producing device for producing a second paper web,
• a take-off screen, which can also be understood as a pick-up felt or removal belt, for bringing together and firmly connecting the second paper web to the first paper web,
• a device for feeding a second endless security element between the first and second paper web when merging the paper webs, and
• a suction and / or rinsing device for removing paper fibers from the second paper web while still wet.

In an advantageous development of the invention, the suction and / or flushing device has an endless belt with at least one recess on, which is stretched on at least two position adjustable guide rollers. The suction device preferably further includes a suction roll or a suction box for generating a negative pressure for sucking paper fibers through the at least one recess of the endless belt. The at least one recess of the endless belt corresponds to the window areas to be produced in the second paper web.

The flushing device has an outlet device. The outlet device is designed to dispense a liquid and directed to the second paper web. Over the directed output of the liquid openings paper fiber are selectively washed away, so that at least one recess is produced in the second paper web. On the outlet device opposite side of the second paper web, a receptacle for receiving the weggespülten paper fibers is provided. The outlet device may be configured to act on the second paper web geometrically in the form of the recess. Furthermore, a bearing surface, which is arranged on the outlet of the opposite side of the second paper web, having openings. The openings are formed corresponding to the recess, so that when two-dimensional loading of the second paper web, the recess is produced. The support surface is preferably an endless belt. The support surface may be formed as an endless belt.

The endless belt can be formed from a sieve-like fabric, for example made of plastic, copper or bronze, or consist of a material that shows a closed surface except for the at least one recess.

Instead of a suction box, the suction device may also have a suction roll or a pipe suction. To assist the suction, at least one spray tube may be arranged on the side of the second paper web opposite the suction device, which sprays a liquid onto the second paper web to convey the fiber to be suctioned through the at least one recess of the endless belt into the suction roll or suction box. To clean the endless belt, the suction device may further contain a screen conditioning with cleaning spray pipes and tube suckers.

The suction and / or rinsing device is advantageously arranged in the device between the second paper layer producing device and the merging position of the paper webs so that the paper fibers can be removed from the second paper web prior to merging with the first paper web and embedding the second endless security element.

• einer ersten Papierlage mit einer Grammatur von 60 g/m² oder mehr, insbesondere von 60 g/m² bis 80 g/m² und einer fest mit der ersten Papierlage verbundenen zweiten Papierlage mit einer Grammatur von 45 g/m² oder weniger, insbesondere von 10 bis 45 g/m²,
• einem ersten endlosen Fenstersicherheitselement, das in die erste Papierlage eingebettet ist und in Fensterbereichen der ersten Papierlage frei zugänglich ist, und
• einem zweiten endlosen Fenstersicherheitselement, das zwischen die erste und zweite Papierlage eingebettet und in Fensterbereichen der zweiten Papierlage frei zugänglich ist,
• so dass das erste und zweite endlose Fenstersicherheitselement auf einander gegenüberliegenden Seiten des Sicherheitspapiers jeweils in den Fensterbereichen der ersten bzw. zweiten Papierlage sichtbar ist.

Finally, the invention also includes a multilayer security paper or document of value

• a first paper layer having a grammage of 60 g / m ² or more, in particular from 60 g / m ² to 80 g / m ^2, and a second paper layer firmly bonded to the first paper layer and having a grammage of 45 g / m ² or less, in particular from 10 to 45 g / m ² ,
• a first endless window security element, which is embedded in the first paper layer and freely accessible in window areas of the first paper layer, and
• a second endless window security element embedded between the first and second paper layers and freely accessible in window areas of the second paper layer,
• such that the first and second endless window security elements on opposite sides of the security paper are respectively visible in the window areas of the first and second paper layers.

In an advantageous embodiment, it is provided that the first and second endless security element have different visual appearances. Advantageously, the first and second endless security elements are embedded with an offset that is more than twice the width of the widest embedded security element. Alternatively, the endless security elements can also be arranged one above the other without offset.

The first and / or second paper layer expediently has at least one further security feature, which is advantageously in register with the window regions of the respective paper web.

Further exemplary embodiments and advantages of the invention are explained below with reference to the figures, in the representation of which a representation true to scale and proportion has been dispensed with in order to increase the clarity.

Fig. 1

schematisch eine Papiermaschine mit einer Rundsieb-Papiermaschine und einer zweiten Papierlagenerzeugungsvorrichtung nach einem Ausführungsbeispiel der Erfindung,

Fig. 2

die Saugvorrichtung der Papiermaschine der Fig. 1 genauer,

Fig.3

in (a) eine Aufsicht auf die Oberseite und in (b) eine Aufsicht auf die Unterseite eines erfindungsgemäßen Sicherheitspapiers in zugeschnittener Form, und

Fig. 4

einen Schnitt durch das Sicherheitspapier der Fig. 3 entlang der in Fig. 3(a) gezeigten Linie IV-IV.

Show it:

Fig. 1

schematically a paper machine with a rotary screen paper machine and a second paper layer production device according to an embodiment of the invention,

Fig. 2

the suction device of the paper machine Fig. 1 more accurate,

Figure 3

in (a) a top view and in (b) a top view of the underside of a security paper according to the invention in a cut shape, and

Fig. 4

a section through the security paper of Fig. 3 along the in Fig. 3 (a) shown line IV-IV.

The invention will now be explained using the example of the production of security paper for banknotes with two mutual security threads. FIG. 1 schematically shows a paper machine 10 with a first paper layer production device, in the present example, a rotary screen paper machine 12 and a second paper layer production device 14, preferably a second round screen.

In round-screen paper machine 12, a paper web 20 is formed in a manner known per se on a round screen 18, a first endless security thread 22 being embedded as window security thread in the paper web 20 during sheet formation. For this purpose, the security thread 22 runs on bumps 26 of the round screen 18 before being immersed in the paper pulp 24 of the paper machine. In the first paper web 20 thus produced, the security thread 22 is basically located in an inner plane of the paper, although no paper fibers are deposited from the paper mass 24 at the contact surfaces of the security thread 22 with the bumps 26, so that the paper web 20 has recessed window areas there, in which the security thread 22 is freely accessible. The first paper web has, for example, a grammage of 60 to 80 g / m ² .

In parallel to this, in the second paper-web-forming device 14, a second, initially homogeneous paper web 30 is produced by the paper pulp being sprayed onto the surface of a round screen 44 with a headbox nozzle 42. The paper layer produced by the second paper-making device 14 is very thin and has, for example, a grammage of only 10 to 25 g / m ² . The second paper web 30 is removed by means of a pick-up felt 16 from the round screen 44 and guided to the first paper machine 12, where it is connected to the first paper web 20 in the region of the pressure roller 36.

How out Fig. 1 As can be seen, the two paper webs 20, 30 are brought together so that the second paper web 30 comes to lie on the recessed window areas opposite surface of the first paper web 20. The security thread 22 embedded in the first paper web 20 is therefore visible and freely accessible even after the merging and joining of the two paper webs 20, 30 in the recessed window areas of the first paper web 20.

When merging the paper webs 20, 30, a second endless security element 32 is also unwound from a reel 34 and embedded in connecting the two paper webs 20, 30 between the first 20 and second paper web 30. In order not to excessively increase the thickness of the security paper, the second endless security element 32 is usually not at the position of the first endless security element 22, but with a predetermined offset Δ (see Fig. 3 ) are embedded to the first security element 22.

Further, between the second paper sheet forming device 14 and the pinch roller 36, there is disposed a suction device 50 which removes paper fibers from the second paper web 30 while still wet in the register to the embedding position of the second endless security element 32. The areas of removed paper fibers form window areas in the second paper web 30, in which the second endless security element 32 is visible and freely accessible after its embedding between the two paper webs 20, 30.

The interconnected paper webs 38 are then fed to other processing stations, such as calenders, sizing and the like.

Instead of or in addition to the suction device 50, a rinsing device 58 for removing paper fibers may be provided.

In the Fig. 2 More specifically shown suction device 50 comprises an endless belt 52 of a sieve-like fabric, which is stretched mechanically tight by a series of adjustable in position guide rollers 54. The endless belt 52 has one or more recesses which correspond in shape and size to the window areas to be produced in the second paper web 30. Within the endless belt 52, a slotted suction box 56 is arranged, with which a negative pressure on the endless belt 52 generated and thereby paper fibers from the second paper web through the recesses of the belt 52 and the slot of the suction box 56 can be sucked.

Instead of a suction box 56, a suction roll or a tube suction can also be used. For cleaning the belt 52, the suction device 50 contain a not shown in the figure sieve conditioning with cleaning spray pipes and pipe sucker.

A multi-layer security paper 60, as is the case with the paper machine Fig. 1 can be produced in the FIGS. 3 and 4 shown in tailored form. It shows Fig. 3 (a) a top view of the top 62 and Fig. 3 (b) a top view on the bottom 64 of the security paper 60. In this case, the side with the emerged from the first paper web 20 first paper layer 70 is referred to as the top, and the side with the resulting from the second paper web 30 second paper layer 80 as the underside of the security paper. Embedded or lying on the opposite side of the security paper elements are dashed lines for clarity. FIG. 4 shows a section through the security paper 60 along the in Fig. 3 (a) shown line IV-IV, each extending approximately in the region of the first and second security thread.

The security paper 60 contains a first, thicker paper layer 70, with a grammage of 60 to 80 g / m ² , in the interior of which a first window security thread 72 is embedded. The first paper layer has window areas 74 in which the first security thread 72 is visible and freely accessible from the upper side 62 of the security paper 60. The first paper layer 70 is fixedly connected to a second, thinner paper layer 80, which has only a grammage of 10 to 45 g / m ² . Between the first and second paper layers 70, 80, a second window security thread 82 is embedded. The second paper layer 80 has window regions 84 in which the second security thread 82 is visible and freely accessible from the underside 64 of the security paper 60. The security threads 72 and 82 are not accessible from the opposite side 64 and 62 of the security paper and at least not visible in incident light.

The visual impression of the security threads in transmitted light can be selected as desired. In an advantageous embodiment, the security threads each carry a metallic coating, for example, into which small, pattern-shaped recesses, for example in the form of a microwriting, are inserted. If these security threads are embedded in at least partially translucent security paper, they appear in transmitted light as dark stripes with bright recesses. If a security thread is not visible in transmitted light, the opposite surface of the security paper may be provided with an opaque coating.

The two security threads 72, 82 advantageously show a different visual appearance, for example the security thread 72 has a color-shift effect and the security thread 82 has a dynamic effect.

In the security paper 60, the two security threads 72, 82 are advantageously offset by an offset Δ (in Fig. 3 (b) ), which is more than twice the width of the widest of the embedded security threads. While Fig. 3 shows an asymmetrical distribution of the security threads 72, 82, the security threads can also be arranged symmetrically to the center line of the security paper 60, so that when turning the security paper in each case a security thread is visible at the same location of the security paper.

As in FIG. 3 indicated, the window areas 74, 84 on the front and back 62, 64 of the security paper can have different shapes and sizes.

The first paper layer 70 may be provided with at least one further security feature 76 associated with the window security thread 72, which preferably is in register with the window regions 74 of the first paper web. In the same way, the second paper layer 80 can be provided with at least one further security feature 86 associated with the window security thread 82, which preferably is in register with the window regions 84 of the second paper web. The associated security features 76, 86 may be, for example, watermarks, recesses of the first or second paper layer or printed elements.

LIST OF REFERENCE NUMBERS

10

paper machine

12

Cylinder mold paper machine

14

second paper layer producing device

16

pick-

18

Round Screen

20

first paper web

22

first endless security thread

24

pulp

26

cusp

30

second paper web

32

second endless security element

34

Kitchen sink

36

pinch

38

interconnected paper webs

42

headbox

44

Round Screen

50

suction device

52

endless band

54

guide rolls

56

suction box

58

flushing

60

security paper

62

top

64

bottom

70

first paper layer

72

first window security thread

74

panes

76

another security feature

80

second paper layer

82

second window security thread

84

panes

86

another security feature

Claims (15)

1. A method for manufacturing a security paper (60) having at least two endless window security elements visible on mutually opposing sides of the security paper (60), in which

   - in a first paper ply production apparatus (12), a first paper web (20) is formed and, in so doing, upon sheet formation a first endless security element (22, 72) is incorporated into the first paper web (20) as a window security element,

   - in a second paper ply production apparatus (14) a second paper web (30) is produced,

   - the second paper web (30) is brought together with the first paper web (20) and firmly connected therewith such that the first endless security element (22, 72) is freely accessible in window regions of the first paper web (20),

   - upon bringing together the paper webs (20, 30), a second endless security element (32, 82) is embedded between the first and the second paper web (20, 30), and

   - by means of a suction and/or rinsing apparatus (50, 58), paper fibres are removed from the second paper web (30) in a still moist state, so that the second endless security element (32, 82) is freely accessible in window regions of the second paper web (30).
2. The method according to claim 1, characterized in that before the second paper web (30) is brought together with the first paper web (20), the paper fibres are removed from the second paper web (30).
3. The method according to claim 1 or 2, characterized in that the paper fibers are removed in registration with the embedding position of the second endless security element (32, 82).
4. The method according to at least one of claims 1 to 3, characterized in that for the first and the second endless security element (22, 72, 32, 82) security elements with different optical appearance are used, respectively.
5. The method according to at least one of claims 1 to 4, characterized in that the second endless security element (32, 82) is embedded with a shifting to the first endless security element (22, 72), which is more than double the width of the widest embedded security element (22, 72, 32, 82).
6. The method according to at least one of claims 1 to 5, characterized in that the first paper web (20) is provided with at least one further security feature which is advantageously located in register with the window regions of the first paper web (20).
7. The method according to at least one of claims 1 to 6, characterized in that the second paper web (30) is provided with at least one further security feature which is advantageously located in register with the window regions of the second paper web (30).
8. The method according to at least one of claims 1 to 7, characterized in that the window regions of the first and the second paper web (20, 30) are configured differently.
9. An apparatus (10) for manufacturing a security paper (60) having at least two endless window security elements visible on mutually opposing sides of the security paper (60), comprising

   - a first paper ply production apparatus (12) for forming a first paper web (20) and for incorporating a first endless security element (22, 72) as a window security element into the first paper web (20) upon sheet formation,

   - a second paper ply production apparatus (14) for producing a second paper web (30),

   - a removal screen for bringing together the second paper web (30) and the first paper web (20) and firmly connecting them, characterized by

   - a device for feeding a second endless security element (32, 82) in between the first and the second paper web (20, 30) upon bringing together the paper webs (20, 30), and

   - a suction and/or rinsing apparatus (50, 58) for removing paper fibres from the second paper web (30) in a still moist state.
10. The apparatus according to claim 9, characterized in that the suction and/or rinsing apparatus (50, 58) has an endless band (52) with at least one recess, which endless band is tensioned on at least two position-adjustable guide rollers (54), and preferably further has a suction roller or a suction box (56) for producing a negative pressure for sucking off paper fibres and/or a rinsing unit for rinsing paper fibres through the at least one recess of the endless band (52).
11. The apparatus according to claim 9 or 10, characterized in that the suction and/or rinsing apparatus (50, 58) is arranged between the second paper ply production apparatus (14) and the position of bringing together the paper webs (20, 30).
12. A multi-ply security paper (60) or value document, comprising

    - a first paper ply (70) with a grammage of 60 g/m² or more, in particular 60 g/m² to 80 g/m², and a second paper ply (80) firmly connected with the first paper ply (70) and having a grammage of 45 g/m² or less, in particular 10 to 45 g/m²,

    - a first endless window security element (22, 72) which is embedded in the first paper ply (70) and freely accessible in window regions (74) of the first paper ply (70), and

    - a second endless window security element (32, 82) which is embedded between the first and the second paper ply (70, 80) and is freely accessible in window regions (84) of the second paper ply (80),

    - so that the first and the second endless window security element (22, 72, 32, 82) are visible on mutually opposing sides of the security paper (60) in the window regions (74, 84) of the first and the second paper ply (70, 80), respectively.
13. The security paper (60) or value document according to claim 12, characterized in that the first and the second endless security element (22, 72, 32, 82) have different optical appearances.
14. The security paper or value document according to claim 12 or 13, characterized in that the first and the second endless security element (22, 72, 32, 82) have a shifting which is more than double the width of the widest security element (22, 72, 32, 82).
15. The security paper (60) or value document according to at least one of claims 12 to 14, characterized in that the first and/or the second paper ply (70, 80) has at least one further security feature (76, 86) which is advantageously located in register with the window regions (74, 84) of the respective paper ply (70, 80), in particular symmetrically with respect to the first and the second paper web (70, 80).

Images