FI117869B - Calendering method for low-gloss fibrous web such as paper, board or a corresponding web, involves calendering low-gloss fibrous web in hard nip zone which has hard-matte-surface rough surfaces manufactured with predetermined roughness - Google Patents

Abstract

The method involves processing a low-gloss fibrous web (W) that passes through a nip zone (N1) formed by two hard surfaces for pressing the fibrous web. The fibrous web is calendered in the hard nip zone, in which the nip zone has surfaces (10,11) pressing the web and arranged as hard matte-surface rough surfaces. The surfaces are manufactured to have a roughness of 0.2 to 1.0 micrometer, preferably a roughness of 0.4 to 0.6 micrometer, to calender the fibrous web to be matte-like. An independent claim is included for the calendering device.

Description

117869

Method and apparatus for making a matte fiber web

The invention relates to a method and a device for producing a matte fiber web. More particularly, the invention relates to a method and a device 5 for calendering low-gloss paper, cardboard or the like.

A method of calendering a fibrous web between two polymer rolls is known for finishing a low-gloss matte finish. By using this method, the fibrous web is capable of providing a small amount of deformation in the case of a calendering nip formed between two soft rolls. In this method, heat is not introduced into the process by polymer rolls. The fiber web is not significantly polished. The method produces a relatively poor smoothness on the fibrous web.

A method of calendering a fibrous web with a special mat roll against a soft roll such as a polymer roll is also known for finishing a low gloss mat surface. This method provides an efficient mat molding process in which the fibrous web is calendered in a nip between a hard and a soft surface. In this method, heat is applied to a calender nipple • 1 · * ... · 20 by a mat roll. The method produces a good smoothness. The mat roll is equipped with * 1 · • · '·· .1 a special hard ceramic coating, and the matte roll has a fine Mat * 1' ···: texture pattern imprinting due to the compression of the fibrous web.

Low-gloss web grades are available in, for example, wood-based and wood-free printing papers, 25, and paperboard. • · 9 * 1 1 uncoated low-gloss matte papers are especially intended for use in copy paper. Coated matte paper · · is used for high-quality printing in demanding applications such as color printing, * ·· • · * ··· 1 photo and art printing papers and specialty products such as calendars, ······ 'business cards, etc.' ·: · 30 ·· ·· · ♦ ♦ ♦ ♦ ♦ · * · 2,117869

In general, matte papers are used for a pleasant surface appearance, uniform gloss and high readability.

As regards the prior art, reference is made to International Patent Publication WO J

5 03/064762, which discloses belt calendering solutions that permit the use of a wide pressure range and a lifetime in the web forming region.

Weak formations have greater basis weight variability and flocs are well above average density and thickness.

10 When calendering, low formation paper is subjected to the highest nip pressure and heat transfer to the thicker flocculations of the paper. When calendering with a conventional smooth roller, it has been found to be detrimental that the flocs become more agitated than the rest of the area, resulting in glossy paper.

15 In the calendering process, the outer surface layer of the paper undergoes a process of so-called small-scale smoothness and optical properties. through the replication process, i.e. the copying mechanism. In this case, the shape of the surface of the roll, and in particular the small irregularities therein, are reproduced, i.e. replicated in nip contact with the paper, ***** provided the fibers of the surface layer of the paper are in a sufficiently plastic state.

• ♦ * * ... · * 20; ***: Thanks to the replication mechanism, the smooth and glossy roll surface gives a smooth • • l and glossy calendering result. Similarly, rough and, on a small scale, * * * * uneven (matte) roll surface produces a matte finish.

The conditions favorable for replication are particularly good. in the long nip belt of the metal belt calender, where long enough ··· · **; nip time results in high temperature, which effectively plasticizes the paper web.

The object of the present invention is to prevent the occurrence of the above-mentioned problems and deficiencies, or at least to reduce the above-mentioned drawbacks, or to provide an alternative way of producing a matte gloss-free fiber web.

3,117,869

It is an object of the invention to provide a method and apparatus for making a matte fiber web.

The following Claim 1 discloses a method according to the invention.

The attached claim 12 discloses a device according to the invention.

The invention provides significant advantages over previously known solutions 10 and among these benefits the following may be mentioned. According to the invention, the surface of a low-gloss fibrous web, such as paper, cardboard or the like, can be finished by pressing it on a heated rough hard surface against another hard surface so that the surface of the web is uniformly matte and of low gloss variation. The matte-inelastic 15 roller roller compresses the area around the seagulls more than the seagulls, resulting in a more efficient matte-matting process, which also makes the surface more matte-like to the flocs, and can help reduce local gloss variation in the extrusion of fiber web.

The hard and inflexible surface mentioned above may be, for example, a roll ♦ * • ♦ *: a metal surface, a metal coated surface of a roll, a ceramic coated surface of a roll or a surface of a metal belt such that the calendering nipple zone at least one surface of the • · * ·· ** web pressing surfaces is a matt surface rough surface. Preferably two. The said 25 surfaces forming a nip band between them are matte surfaces, whereby · · in the same nip band, both surfaces of the fiber web are calendered * · * 1 'matte.

For other features and advantages of the invention, reference will be made to the dependent claims of * 4 · * / · 30 and to the following specific part of the specification which explains in detail, but only 117869, examples of preferred embodiments of the invention. embodiments and their feasibility.

The invention will now be described with reference to the accompanying drawings, in which:

Figure 1 schematically shows the gloss variation of webs of the same wood-free uncoated (WFU) paper with two different pressures applied in five different web forming processes.

Figure 2 schematically illustrates the gloss variation of webs of the same wood-free coated (WFC) paper with two different pressures applied in five different web forming processes.

Figure 3 is a schematic side view of an exemplary embodiment of the device 15 of the invention.

Fig. 4a is a schematic side view of another exemplary embodiment of the device according to the invention.

Figure 4b shows a schematic side view of a third exemplary embodiment of a device according to the invention.

Fig. 4c is a schematic side view of a variant of the apparatus of Fig. 4a * 1.

Fig. 4d is a schematic side view of a variant of the device of Fig. 4c «« - * ♦ '! 1.

Figure 5 is a schematic side elevation view of a fourth surface finish of a low-gloss fibrous web of the invention, such as paper, board or the like, in process tests by extruding the web on a heated rough surface. In these experiments, in which various matte-coated plates have pressed the fibrous web against a smooth hard surface under conditions similar to the calendering conditions, it has been found that the surface of the web is made to be uniformly matte and of low gloss variation. The experiments were carried out by compressing the paper web with various matte steel plate presses at 170 ° C with a dwell time corresponding to the calender nip and pressing pressure.

10 The paper used in the tests was uncoated fine paper (WFU, 80 g / m2), that is, standard copy paper and coated fine paper (WFC, 100 g / m2).

For both paper grades, matte press plates VM1, VM2, V3 and V4, which were hard-coated steel presses, were tested. The roughness surfaces of the press surfaces Ra · 15 were VM1 0.6 µm, VM2 0.62 µm, V3 0.48 µm and V4 0.45 µm. The reference press was a smooth steel press with a Ra roughness of about 0.1 µm. Conventional quality properties (density, PPS smoothness, Bendtsen smoothness, Hunter gloss) and gloss uniformity (gloss variation) were measured from the papers tested.

* • · ··· * · ♦; * 20 Here, the result of the gloss variation is expressed by a coefficient of variation which represents the relative variation of the gloss. The coefficient of variation indicates the percentage of the same ·

* * I

'**, * The standard deviation of the gloss measured at different points in the sample differs from the mean luster of the sample * * * ft · · I'. The gloss variation was measured with a KCL measuring instrument * * * · (KCL = Oy Keskuslaboratorio - Centrallaboratorium Ab, Espoo, Finland).

. 25 • · * • ♦ ·

The above tests have resulted, among other things, in the result that the gloss variability of the end product calendered against a hard surface roll by a hard matt roller is significantly reduced compared to the end product calendered by a standard smooth surface roller * · *; ; 30 gloss variations. The matte-inelastic roller surface compresses the ft ·· flocs more strongly than the area around the flocs, resulting in a more efficient matte-molding process 611869, which also makes the surface more matte than the flocs. The roll surface patterns and topography are replicated in the paper. In this way, the invention can reduce the occurrence of local gloss variation when compressing a fibrous web in a calendering nip.

5

The mat roll is equipped with a special hard ceramic coating, and the fine mat pattern of the mat roll is structured by the compression of the fibrous web.

In the above process tests, 80 g / m WFU and 100 g / m WFC paper webs were pressed against five smooth surface types against a smooth hard surface and subsequently determined the gloss variation of the fiber web. The five different surface types are shown in the same order as the bars representing the gloss fluctuation values measured on the Tain pressed on these surfaces are shown in sequence in the diagrams of Figures 1 and 2, respectively. The first four surfaces VM1, VM2, V3 and V4 are various rough mat surfaces which correspond to matte heated heat rolls in the calendering process. The fifth surface is a smooth heated surface that corresponds to a smooth heatable thermal roll that is common in the calendering process.

***** The gloss variation is measured in three different ranges of wavelength, less than 1 mm, · ** * ... 1 20 in the range 1 mm to 5 mm and more than 5 mm, which are plotted on the horizontal axis of the graphs.

··· * ··. ' On each surface VM1, VM2, V3, V4, and on a smooth surface against a hard surface, the gloss results obtained by squeezing the fiber web at a given * 1 · wavelength are plotted as columns of height • t * ··· 1 gloss. The gloss variation is thus plotted on the vertical axis of the graphs.

, 25 The calendering pressures used in the experimental arrangements have been the »» il; 3 MP in the upper charts and 9 MPa in the lower charts.

In the upper graph of Figure 1, when used with a compression pressure of 3 MPa * · 1 * * · · · 'mat mattes VM1, VM2, V3, V4 were obtained by compressing into a WFU web • 1 i /: value of 30 gloss variation coefficient at a wavelength of <1 mm for about 3, • · '... t for a smooth surface with a gloss variation of about 9. Further, at 3 MPa, the corresponding values of 7 117869 for the gloss variation coefficient ranged from 1 mm to 5 mm for about 2-3 and about 6, respectively. more than 5 mm about 2 and about 3.

1, VM2, V3, V4 had a gloss variation coefficient value obtained by pressing on a WFU web at a wavelength <1 mm of about 4-5, while on a smooth surface a gloss variation of about 9 MPa was obtained. the values were 10 in the range of wavelengths from 1 mm to 5 mm in the range of about 2-3 and about 13 and respectively in the range of wavelengths over 5 mm in the range of about 2 and about 7.

From Figure 1, it can be seen that as pressure increases, the glossiness of the WFU caused by a conventional thermal roller increases, but the glossiness of the mat roll VM1, VM2, V3, 15V4 remains constant or decreases. There is an enhanced matte editing process at the block locations.

In the upper graph of Figure 2, when using a compression pressure of 3 MPa · * · «on matt surfaces VM1, VM2, V3, V4, the value of the 20 gloss variation coefficient of variation at a wavelength <1 mm of about 9- • * / ··· 12 for a smooth surface with a gloss variation of about 21. Still at 3 MPa • · · *** · / the corresponding values for the gloss variation coefficient values were * * · *** in the range of 1mm to 5mm for about 3 and about 12, respectively • · • «" * with a wavelength of more than 5 mm about 2-3 and about 7.

In the lower diagram of Figure 2, when using a compression pressure of 9 MPa • · ** 'on the mat surfaces VM1, VM2, V3, V4, the value of the gloss variation coefficient of variation <1 mm obtained by pressing on the WFC web was about 9- • **; · 11 while the smooth surface had a gloss variation of about 49. Still at 9 MPa * * 30, the corresponding values of the gloss variation coefficient values were · • * • * * · · '117869

O

in the wavelength range of 1 nun to 5 mm in the range of about 3-4 and about 22, and in the wavelength range of greater than 5 mm in the range of about 2-3 and about 15, respectively.

From Fig. 2, it can be seen that as the pressure increases, the glossiness of the WFC caused by a conventional thermal roller 5 increases dramatically, but the glossiness of the mat roll VM1, VM2, V3, V4 remains constant or decreases. There is an enhanced matte editing process at the block locations.

As shown in Figures 1 and 2, it can be seen that the gloss variation 10 produced by the matt roll is only about 20-50% of the gloss variation produced by a smooth-surface roll in the WFU and WFC grades. The fibrous web species mentioned in the test arrangements are calendered under the same calendering conditions to the same sweat and to approximately the same surface roughness level. Further, under the same calendering conditions, humidity, temperature and dwell time conditioning in the 15 experimental arrangements are intended herein. !:

Referring to Figures 1 and 2, it can further be seen that the higher the pressure calendering, the more significant the benefit to the mat surface becomes. This is important for dense calendered mat species. This also i «» 20 means that a uniform matte process can be implemented particularly well with a hard nip and / or nip zone such as, for example, • 1; machine calender or metal belt calender or multi roll roll calender. The advantage of using a hard * 1 1 nip / nip zone is its simplicity and the ability of «1 ·« «* ··· 1 to use two matt surfaces on both sides. In a two-sided process consisting of two or at least two mat hard non-resilient • · 1 '1j · 1 press surfaces, one can effectively improve the surface properties of both sides of the paper • · * ·; 1' matte, avoid local gloss variation when calendering, adjust paper thickness to produce the final product • 1 # * ... · and smooth the paper thickness profile to provide smooth rolls 30 in the winding.

«4 - · · •» .....

• 1 * »» 9 117869

The hard matte treatment zone may be, for example, a nip such as a roller nipple or a roller / belt nipple or a belt / belt nipple, or a zone such as a roller / roller belt or roller belt zone or belt / belt zone. Preferably, the hard mat treatment zone is, for example, one of the nip zones 5 of the device 100 shown in Figures 3-5, such as the mat roll / mat roll nipple shown in Fig. 3 or the mat roll / metal belt nipple or Fig. 4b; Fig. 4d is a mat roll / metal belt zone or a metal belt / metal belt zone shown in Fig. 5. Specifically, when using a metal belt, the calendering nip profiling can be provided by an additional loading roll provided inside the belt rotation, which may be, for example, a deflection compensated roll, such as that shown in Figures 4b, 4c and 4d.

Figure 3 is a schematic side view of an exemplary embodiment of the device 15 100 of the invention, wherein the device comprises at least one hard nip zone N1 of Figure 3 through which the fibrous web W to be treated is passed; To a Ra roughness of 0.2 to 1.0 µm, • f! preferably 0.4 to 0.6 µm. In Fig. 3, the device preferably comprises two nip zones N1 formed by two matte-hard matt thermal rollers 10 and 11, wherein the forming area of the web W is a hard matt roll / matt roll nip N1.

* * ·: · Optionally, one of the hard rolls of the hard nip zone N1, for example ·. ·. * Thermo roll 11 could be a smooth surface roll such as a smooth thermo roll.

Fig. 4a is a schematic side view of another exemplary embodiment of a device of the invention in accordance with the invention, wherein the device comprises at least one of Fig. 4a.

Hard nip zone N2 according to '··· * through which the fibrous web W to be processed

exported. Here, the hard nip zone N2, and thus the forming zone «··, of the web W is formed by a matte surface hard thermo roll 10 and a metal belt 12 between which · * ·, · 30 fiber web W is guided during calendering. The nip zone N2 provides: • ·: *** · compression by the tension of the metal belt 12. In the nip zone N2, at least one of the extruding surfaces of the 1 · 7869 web W is a hard matt rough surface made to a Ra roughness of 0.2 to 1.0 µm, preferably a Ra roughness of 0.4 to 0.6 µm.

In Fig. 4a, the apparatus comprises a nip zone N2 formed by a matte-hard thermo roll 10 and a matte-metal belt 12, wherein the forming area of the web W 5 is a hard mat roll / metal belt N2 with a length allowing a longer residence time. Optionally, one of the hard surfaces of the hard nip zone N2, for example a metal belt 12 or a thermo roll, could have a smooth surface.

Figure 4b is a schematic side view of a third exemplary embodiment of the device 100 of the invention, the device comprising at least one of Figure 4b

according to the hard nip zone N3, through which the fiber web W

exported. Here, the hard nip zone N3 and thus the forming zone of web W are formed by a matte surface hard thermal roll 10 and a metal belt 12 between which the fibrous web W is guided during calendering and a nipple 13 supporting the metal belt 12 The 13 may preferably be a deflection compensated roll. In nipple zone N3, at least one of the pressing surfaces of the ****: web W is a hard matt rough surface, which is made to a Ra roughness of 0.2 to 1.0 µιη, preferably to a Ra roughness of 0.4 to 0.6 µιη .

In Fig. 4b, the device comprises a matte-surface hard thermo roll 10 and a smooth-surface • · ···;

A nip zone N3 formed by a metal belt 12, wherein the web W

0 * «** j · * the working area is a hard mat roll / metal strap N3. Optionally, * * * * * * * metal strap 12 may have a matte finish, 25 · · ·, · · ·

Figure 4c is a schematic side view of an example of a modification of the device ♦ »• · * ♦ * of Figure 4a, wherein the device comprises at least one of the device 4c ·····

* * according to the hard nip zone N4 through which the fiber web W is to be processed

«* · * ··· * is exported. Here, the hard nip zone N4, and thus the forming zone • * ϊ, * · ϊ 30 of the web W, is formed by a matte surface hard roll 10 and a metal belt 12 between which * * * fiber web W is guided during calendering. In the nip zone N4, the tension of n 117869 web W is provided by the tension of the metal belt 12 and the nip roll 13 which presses the metal belt 12 towards the thermal roll 10 and exerts additional compression force on the nipple roll 13 of the nip zone N4. In the nip zone N4, at least one of the press-pressing surfaces of the web W5 is a hard matt rough surface made to an R * roughness of 0.2 to 1.0 µm, preferably a Ra roughness of 0.4 to 0.6 µm. In Fig. 4c, device 100 comprises a matte-surface hard roll 10 and a matte metal belt 12 and a nip zone N4 formed by a nip roll 13, wherein the forming zone of web W is a hard mat roll / metal belt N4 whose length 10 allows Optionally one; from the hard surfaces of the hard nip zone N4, for example the metal belt 12 may have a smooth surface. It is also possible that the hard nip zone is formed between a smooth surface roller and a matt surface belt.

15

Figure 4d is a schematic side view of an example of a modification of the device 100 of Figure 4c, wherein the device comprises at least one hard nip zone N5 of Figure 4d through which the fibrous web W to be processed is passed. Here, the hard nip zone N5, and thus the forming zone * * · * ··· * 20 of the web W, is formed by a matte surface hard roll 10 and a metal belt 12 between which the fiber web W is guided during calendering. In the nip zone N5, a tension of the metal belt 12 is provided by a tension of the metal belt 12 and a long nip roll which supports the metal belt 12 to apply additional clamping force to the forming web W, • · * · '** 14 is preferably a deflection compensated roll

. 25 for example the so-called. a shoe roll. At nip zone N5, at least one web W

II »press surfaces have a hard matt rough surface made to a Ra · · * · * roughness of 0.2 to 1.0 µm, preferably a Ra roughness of 0.4 to 0.6 µm. In Fig. 4d, the device comprises a matte surface hard roll 10 and a matte metal belt 12 * *

And the nip zone N5 formed by the long nip roll 14, wherein the web W

* «\ '* I 30 working area is a hard mat roll / metal belt zone N5 with a length of * * · * ... · which allows a longer dwell time and a long nip roll used as a press member 117869 12 14 allows for a desired pulse shape. Optionally, one of the hard surfaces of the hard nip zone N5, for example metal belt 12, may have a smooth surface.

Figure 5 is a schematic side view of a fourth exemplary embodiment of the device 100 of the invention, wherein the device 100 comprises at least one of Figure 5;

hard nip zone N6, through which the fibrous web W

exported. Here, the forming zone of the hard nip zone N6 and thus the web W is formed by a matte metal belt 12 and another matte metal belt 10 15, between which the fiber web W is guided during calendering. Belts 12; 15 is supported by guide rollers 17. In the nipple zone N6, pressure is provided on the metal belts 12 and 15 and optional metal belts 12; 15 by means of supporting / clamping nip rolls 16, 16 '. The nip rolls 16, 16 'shown in dashed lines in Fig. 5 may form a nip with each other and support the metal belts 15 and apply additional clamping force to the forming web W. In Fig. 5, the nip , such as the .... Ϊ nipple formed by two metal straps. In nipple zone N6, at least one of the surfaces pressing the web W is. ***. 20 hard matt rough surface made with a Ra roughness of 0.2 -1.0 pm, ·· ♦.

. ***. preferably Ra roughness of 0.4 to 0.6 µm In Figure 5, device 100 comprises ··· • · *; a matte metal belt 12 and a second matte metal belt 15 formed between it by a nip zone N6, wherein the forming zone of the web W is hard * ««: ***: a metal belt / metal belt N6 with a length allowing a longer residence time of * * · 25, and optional nip rolls 16, 16 'ϊ ·' used as press members. furthermore, make the shape of the pressure pulse desired. Optionally · »·: One hard surface of the hard nip zone N6, for example metal belt 12, can be .... ϊ smooth surface.

··· * · • · ·. The matte surface temperature of the rolls and belts shown in Figures 3-5 may be arranged to be in the range of about 80-220 ° C, particularly preferably in the range of about 140- * * ··· 117869 13,200 ° C for calendering web W. According to one embodiment, in nip zones N1-N6 has a maximum pressure of about 0.2-40 MPa, particularly preferably about 5-20 MPa.

In one embodiment, the fibrous web W shown in Figures 3-5 is wood-free, uncoated paper, such as copy paper or color copy paper (WFU), having a bulk of 1.1 to 1.4 and a smoothness of 6.0 to 4.0 PPS or about 50 to 200 ml / min Bendtsen, or better than said smoothness values.

The fibrous web W shown in Figures 3-5 is, according to one embodiment, wood-containing uncoated paper.

The fibrous web W shown in Figures 3-5 is, according to one embodiment, wood-free coated paper such as Fine Paper (WFC) suitable for use in high quality printed matter such as brochures, art printing products, etc., having a bulk of about 0.8-1.0 and smoothness of about 0. , 8-1.2 PPS.

According to one embodiment, the fibrous web W shown in Figures 3-5 is wood-coated paper.

Il *:: 20 Ml · · · * ... * In one embodiment, the fibrous web W shown in Figures 3-5 is cardboard.

• · • · *.

The at least one hard nip and / or nip zone shown in FIGS. 3-5 may be provided, for example, in a machine calender or a metal belt calender or in a 25 roll multi caliber calender.

The invention has been described above using an example of a hard roll surface as an example.

Ml · · 11-1 ··· • ·. metal roller * especially matte thermo roller, but also other hard inelastic ··· • *.

* · .. * roller surface comes in the form of a metal coated roller surface. It is advantageous to use 7 ·· 30 special ceramic coated matt rolls. Similarly, the invention has been described above using a metal belt as an example of a hard belt surface, it is preferable to use a heated mat belt such as a metal belt, but other hard non-elastic belt surfaces are also contemplated.

The invention has been described above by way of example with reference to Figure 5 of the accompanying drawings. However, the invention is not limited to what is described in the description and figures, but various embodiments of the invention may vary within the scope of the inventive idea defined in the appended claims.

10 • · · · 4 · • · f • · · * · 1 • f # • • • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·ener ·

Mt · * 1 · • · 1 • 4 f ··· * · • 1 * ·· • · · 1 · '- • · · 1 ·' - • · · · ft. 1 • 1 • · • 1 · • · • 1 · • 1 · · ·. 1 • · • 1 ···

Claims (24)

A method of calendering a low-gloss fiber web (W), such as a web, paper, or similar web, in such a manner that the fiber web is guided through a nip zone (N1-N6) formed by two hardened surfaces in such manner, said fiber web (W) being processed pressed into said hardened nip zone (N1-N6) formed by eating at least two hardened surfaces, characterized in that the fiber web (W) is calendered in eating at least one hard nip zone (N1-N6), in which nip zone has at least one surface (10; 11; 12; 15) pressing the web is arranged as a hardened matte surface having a surface roughness of 0.2-1.0 µm, advantageously a Ra roughness of 0.4 -0.6 μτη, to calender the fiber web (W) so that it becomes dull. 2. A method according to claim 1, characterized in that the surface of a matte surface (10,11) of thermal roller is provided as at least one surface which presses the web (W) in the nip zone (N1-N6). Method according to claim 1, characterized in that the surface of a metal surface (12,15) with matte surface is provided as at least one surface which presses the web (W) into the nip zone (N1-N6). 20 • · 1 • · '··· 1 Method according to any one of claims 1 - 3, characterized in that two surfaces (1), (2) 1 (10,12) pressing the web (W) between them in the nip zone (N1-N6) are arranged as: 1 matte surfaces, both surfaces of the fiber web (W) being calendered to mat in the same nip zone. 25 • · 1 • «· IX Method according to any of claims 1-4, characterized in that the temperature of the matte surface of the nip zone (N1-N6) is arranged at about 80-220 ° C, advantageously about 140-200 ° C. ·····. • 1 ·· • · · · • · • 1 · * · · 2 • 1 117869 6. A method according to any of claims 1-5, characterized in that about 0.2-40 MPa, advantageously about 5-20 MPa, is arranged as a pressure maximum in the nip zone (N1-N6). 5 Process according to any of claims 1-6, characterized in that in the process wood-free uncoated paper (W), such as copy paper or color copy paper (WFU), whose bulk is 1.1-1.4 and whose surface roughness is 6.0, is calendered. -4.0 PPS or about 50-200 ml / min Bendtsen or better. 10 Method according to any of claims 1-6, characterized in that wood containing uncoated paper is calendered in the process. 9. A method according to any of claims 1-6, characterized in that in the process wood-coated coated paper, such as fine paper (WFC), whose bulk is about 0.8-1.0 and whose surface roughness is about 0.8-1, is calendered. , 2 PPS. Process according to any one of claims 1-6, characterized in that wood-containing coated paper is calendered in the process. »M ·· • · • · · 20 11. A method according to any of claims 1-6, characterized in that in the * * * * ... * process, the cardboard is calendered. • »• * * • · · ··· · * · * A device (100) for calendering a low gloss fiber web (W), such as a web of paper, cardboard or the like, which device comprises a core. A nip zone (N1-N6), which forms at least two hardened surfaces between them, for conducting the fiber web (W) through said hardening nip zone (N1-N6) and pressing thereon, characterized by , that the device (100) comprises at least one hardened nip zone ··· # · * ··· * (N1-N6), in which at least one surface pressing the web is a hardened rigid surface with matte surface formed with a Ra 0.2-1.0 µm, preferably a Ra, 0.4-0.6 µm, for calendering the fiber web (W) so that it becomes dull. • · * · · • * # * · 117869 Device (100) according to claim 12, characterized in that at least one surface pressing the web (W) in the nip zone (N1-N6) is the surface of a matte surface (10,11). Device (100) according to claim 13, characterized in that the matte surface (10, 11) is a thermal roller. Device (100) according to claim 12, characterized in that at least one surface pressing the web (W) in the nip zone (N1-N6) is the surface of a strip (12,15) with matte surface. Device (100) according to claim 15, characterized in that the band (12,15) with matte surface is heated. Device (100) according to any of claims 12 - 16, characterized in that two surfaces (10, 12) pressing the web (W) between them in the nip zone (N1-N6) are matte surfaces, whereby the surfaces of the fibrous web are bathed. (W) is calendered to the mat in the same nip zone. ···· «'• 1 ···' ' Apparatus (100) according to any of claims 12 - 17, characterized in that the mat surface in the nip zone (N1-N6) is heated to a temperature of about • 1 in the 80 ° C. 220 ° C, preferably about 140-200 ° C. * • · · • · · • 1 1 • # 1 * 1. * · 1 · ' Device (100) according to any one of claims 12-18, characterized in that. The size of the pressure maximum in the nip zone (N1-N6) is about 0.2-40 MPa, advantageously about 5-20 MPa. • · • «• · · * · ♦ '.' ·· ♦ ♦ * · **! Device (100) according to any one of claims 12 - 19, characterized in that the nip zone (N1-N6) is a belt / roll nip (N3) or a belt / roll zone. N4; N5) or a band / band nip or single band / band zone (N6). • · • · ♦ · 117869: Apparatus (100) according to any one of claims 12 - 19, characterized in that the nip zone (N1-N6) is a roll / roll nip (N1) or a roll / roll zone. Device (100) according to any of claims 12 - 19, characterized in that the nip zone (N1-N6) is a nip or zone in a metal band calender. Device (100) according to any of claims 12 - 19, characterized in that the nip zone (N1-N6) is a nip or zone in a machine or long nip calendar. Device (100) according to any one of claims 12 - 19, characterized in that the nip zone (N1 -N6) is a nip or zone in a plurality calendar. 15 »« · »· * ♦ · * 1 2 3 1 • · • t • · · • 1 · • · • ♦ •« · • 1 • · · • · · *. 1 • · ♦ »· · • · 1 • · · ♦ · • · • · · m • · · • · · ··» • »• · · ♦ # ···. ... • · • · • 1 · • · 1 ♦ · 2 • · 3 • «• · · •« · J • ·