EP1964971A2 - Method for producing a coated length of fibre sheet, in particular paper or cardboard - Google Patents

Abstract

The method for producing a special fibrous web such as a coated paper or paperboard, comprises forming web from a fibrous material mixture with a headbox (2) and a wire section (3), dewatering the web in a pressing section (4), pre-drying the formed fibrous web (7) to obtain a residual moisture content, coating both web sides (7a, 7b) of the fibrous web, and redrying and rolling the fibrous web. In an on-line process, the web side is provided triply with coating section (11, 17, 18). The two last coating sections are applied directly with a 1:1-coating unit without intermediate drying. The method for producing a special fibrous web such as a coated paper or paperboard, comprises forming web from a fibrous material mixture with a headbox (2) and a wire section (3), dewatering the web in a pressing section (4), pre-drying the formed fibrous web (7) to obtain a residual moisture content, coating both web sides (7a, 7b) of the fibrous web, and redrying and rolling the fibrous web. In an on-line process, the web side is provided triply with coating section (11, 17, 18). The two last coating sections are applied directly with a 1:1-coating unit without intermediate drying, i.e. wet on wet manner. The first coating layer and/or a further and/or second coating section are applied indirectly with a film spreading unit and/or directly with a bladecoater. The first coating layer and/or the further and/or second coating layer are applied directly with a 1:1-coating unit. The first coating layer, a pigment containing pre-coating, a middle coating layer, a function layer and the last coating layer represent a covering and/or a protective layer. The first and second web sides are coated in multilayer manner. The coating layer has a coat weight of 70-120 g/m 2>of total or per web side. A curtain-coat coating unit or spray coating unit is used as 1:1-coating unit. Calendering of the fibrous material web is carried out before the pre-coating and/or the first coating layer and/or after the pre-coating and/or the first coating layer and/or before rolling. Independent claims are included for: (1) a machine for the production of a coated fibrous web; and (2) a special paper.

Description

The invention relates to a process for the production of a coated fibrous web, in particular of paper or board, comprising the following steps: web formation from a pulp mixture with a headbox and a wire section; Drainage in a press section; Pre-drying to dry the formed fibrous web at least to a residual moisture content; Coating at least one side of the fibrous web; Post-drying and reeling of the fibrous web.

Such methods are common practice for producing various types of paper or board.

If special papers are to be produced, in online or offline coating systems usually direct coating processes with conventional, so-called doctor blade coating devices (the doctoring element connected downstream of a coating nozzle can be a blade or a blade or a roller blade) are used.
But there are also indirect coating methods, such as the film coating into consideration. Here, the application medium is applied with a coating unit on the surface of an applicator roll and forms a film here. This application roller forms a nip with the fibrous web to be coated, in which this film is transferred to the coating side of the web.

In many cases, a multiple coating should be done.

For some time, a new method has been tried, namely to use the 1: 1 method. In contrast to the above-mentioned conventional methods with the corresponding doctor blade or film coating equipment, namely, in the 1: 1 method, the application medium only needs to be applied in the amount that is to remain on the fibrous web. This saves application medium, energy for the customer Return of excess medium and also said squeegee devices for dosing the application layer. In addition, in the 1: 1 order, the fibrous web is spared, because the order of the medium takes place without contact. The application medium is used either in a spray process, for example, with a free-jet nozzle commissioned work, for example, in the US 5,603,767 (U5210), or curtain curtain coating with a curtain coater. The latter coater including method is for example in the WO 98/48112 (PU8022).
When doctor blade - discloses, for example, in the DE-A1-42 30 276 (U4964) - one achieves a high surface smoothness by a "leveling effect" of the squeegee element, which is however at the expense of a uniform coverage. In addition, there is an increased risk of breaks in the web in the area of the doctor element. In addition, the coating weight range is relatively narrow.

On the other hand, a curtain coating unit is capable of ensuring perfect coverage on the coating side of the web when a closed curtain is functioning. The application medium used, i. the coating color is distributed very evenly, but the smoothness achieved is often insufficient for certain purposes due to the lack of leveling element (doctor element).

If the fibrous web or papers are to be coated several times, the web is so far driven several times through the coating system, which is very expensive. This also means production losses due to winding losses (core scrap, scraps, etc.) and means lower overall productivity.

Good runnability, ie web travel properties, is important here since the process or production process is to take place online. The Bladecoater (blade applicators) used in previous methods often caused web breaks. These breaks are undesirable, especially in online processes, because at each demolition not only the production in the finishing section fails, but at the same time as the paper machine.

The object of the invention is therefore to provide an on-line method and a machine for producing a coated fibrous web, in particular for a special paper, which or which enables a high quality of the application layer and yet has a high productivity.

The object of the invention is achieved by a method according to the characterizing part of claim 1.

According to the invention, the method is carried out by providing at least one side of the web of the fibrous web at least three times with application layers, wherein at least the last two application layers are applied in a direct manner with a one-to-one coater, and this process is processed online without intermediate drying, i. wet in wet, is performed.

As a result, a particularly good coverage and an overall high productivity is achieved.

The inventors have recognized that if the last two application layers are applied with a one-to-one coater, in particular the costs for an otherwise quite high-quality and expensive functional layer (required with special papers) can be reduced.

Particularly advantageous in this context is when the last two application layers are applied with a curtain applicator. This makes it possible to apply said functional layer, but also a cover layer, the latter eg as a protective layer, at the same time, without the web having to pass through the coating machine several times. This saves time, costs and avoids winding losses and demolition risks. The runnability and productivity are extremely high. At the same time, the functionality of the product is improved.

It is also advantageous if a pigment-containing medium (pigment coating) is applied with a conventional doctor blade coater as the first application layer, ie as precoat or base coat, because this way the web is leveled and the pores of the fibrous web are sealed. This achieves a very good starting quality for the subsequent application layers, which can now be applied with the said at least one 1: 1 applicator. The functional layer following the base layer applied with the squeegee device can thereby be reduced in its layer thickness, as a result of which costs are also saved.
It should be noted that a technical performance rule is generally much more expensive than a standard pigment stroke. A function bar or a functional layer can be for example a thermo-layer, an NCR-layer or even a silicone layer. The layer may also be intended to provide grease or water resistance.

The last layer or the coating forming the cover layer is transparent and is intended to serve as a protective layer against environmental influences, fats, oils, water abrasion, etc.

The method according to the invention is suitable for one-sided but also for two-sided applications. For two-sided strokes, one side is first pre-painted and immediately painted over. Thereafter, the coating of the second web side takes place in the same manner.

The object of the invention is also achieved with a machine for producing the coated fibrous web. According to the invention, for the application of at least three coating layers on at least one web side of the fibrous web for the at least two last application layers at least a 1: 1 applicator, that is a curtain applicator and / or a Sprühauftragswerk provided without arranging an intermediate drying device. With such a 1: 1 coating unit, a complete and particularly uniform coverage of the fibrous web surface can be achieved.

Thus, in the end, an attractive smoothness can be achieved, a conventional commissioned work in the form of a doctor blade for direct application or a film applicator for indirect application is provided for the first layer of coating or the precoat. Such applicators are well known and should therefore not be further explained at this point.

The inventors have recognized that it is particularly expedient for the at least two last application layers, i. for the application of a functional layer and a cover layer, to provide a curtain applicator as a 1: 1 commissioned work. This curtain application plant has at least one application head arranged above the fibrous web and spaced therefrom. The applicator head includes at least one medium distribution chamber and at least one application or dispensing nozzle communicating with the distribution chamber via a supply nip for a coating medium curtain to be dispensed to the fibrous web underneath.

As a curtain commissioned work, various variants are suitable.

A first variant may consist in that a single application head is arranged with parallel distribution chambers. From each distribution chamber for the application medium used branches off a supply gap. The feed gaps unite at the exit of the applicator head in a common dispensing nozzle for dispensing a double layer application medium curtain. This design is referred to by the applicant company as a "twin" design.

A further variant may consist in that the curtain applicator has two applicator heads arranged one after the other running parallel to one another in the running direction of the fibrous web, each containing one feed chamber, one feed gap and one dispensing nozzle each for dispensing a single-layer application medium curtain. The two curtains lay down only on the fibrous web as a double layer. This design is referred to by the applicant company as a "tandem design".

A further variant may consist in that the curtain applicator has two mutually offset, parallel in the direction of the fibrous web, successively arranged applicator heads each having a feed chamber, a respective supply gap and a respective dispensing nozzle for dispensing a single-layer application medium curtain.
Below this single-layer curtains, an inclined collecting plate is arranged, on which the said curtains deposit one above the other and lead to a double layer, which then forms a double-layer application medium curtain, which also deposits as in the first variant as a double layer on the surface of the fibrous web ,

A further variant may also consist in that the curtain applicator has indeed a single application head but with mutually offset in height, parallel distribution chambers. The feed gaps branching therefrom run upwards in the direction of an inclined run-off plane or sliding surface, on which the respective emerging application medium unites to form a double layer, thereby forming a double-layer application medium curtain. In the direction of the fibrous web, this double-layered curtain likewise again lays down as a double layer, that is to say the previously described functional layer and covering layer on the fibrous web.

With regard to the surface quality, it is expedient if a smoothing device is arranged before and / or after the first applicator unit and / or before the reeling at the end of the machine.

Further embodiments of the invention will become apparent from further subclaims.

With the inventive method according to claims 1 to 9 and the machine according to claims 10 to 17 special papers can be produced for the first time with high productivity.

Reference to an embodiment, the invention will be explained in more detail.

Figur 1:

in schematischer Darstellung eine Gesamtmaschine zur Herstellung einer beschichteten Faserstoffbahn

Figur 2 bis 5:

in schematischer Darstellung Varianten eines für das erfindungsgemäßen Verfahrens verwendetes Vorhang-Auftragswerk

It shows:

FIG. 1:

a schematic representation of an overall machine for producing a coated fibrous web

FIGS. 2 to 5:

schematic representation of variants of a curtain applicator used for the process according to the invention

In the figures, the same reference numerals mean the same components.

• Bahnbildung aus einem Faserstoffgemisch, mit einem Stoffauflauf 2 und einer Siebpartie 3, Entwässerung in einer Pressenpartie 4, Vor-Trocknung in einer aus Trockenzylindern 5 bestehenden Vor-Trockenpartie 6, um die gebildete Faserstoffbahn 7 zumindest bis auf einen Restfeuchtegehalt zu trocknen, eine Nachtrockenpartie 8 und die Aufrollung 9 der fertigen, beschichteten Faserstoffbahn 7, die damit weiteren Verarbeitungsprozessen, wie Längsschneiden in einzelne Bahnrollen und/oder Formate und einer späteren Bedruckung oder dergleichen zur Verfügung steht. Dabei kann von der Siebpartie 3 (Former, bzw. Gap-Former) bis hin zu einer Impingement-Trocknung mit Heißluft die Bahn 7 gestützt geführt werden. Bei der Pressenpartie 4 kann eine Schuhpresse oder eine Tandem-Nipco-Presse oder eine mit Centerbelt betriebene Duo-Centri-Nipcoflexpresse verwendet werden.

The FIG. 1 is intended to show that the production and refining of the fibrous web takes place in an online process. In the FIG. 1 Within the fibrous web manufacturing machine 1, the known method steps or machine configurations 2 to 6 are only roughly illustrated as a box and mean:

• Web formation from a pulp mixture, with a headbox 2 and a wire section 3, dewatering in a press section 4, pre-drying in a pre-dryer section 6 consisting of drying cylinders 5 in order to dry the formed fibrous web 7 at least to a residual moisture content, an after-dryer section 8 and the reeling 9 of the finished, coated fibrous web 7, which is thus available for further processing processes, such as longitudinal cutting into individual web rolls and / or formats and subsequent printing or the like. In this case, the web 7 can be performed supported by the wire section 3 (shaper, or gap former) up to an impingement drying with hot air. The press section 4 may use a shoe press or a tandem Nipco press or a Centerbelt operated Duo Centri Nipcoflex press.

In the example chosen, following predrying, 6 and optionally following a desired pre-smoothing 10 with at least one single-nip calender, a triple coating of the same web page. For the application of a first coating layer 11 is first made directly. In the example, this consists of an application unit 12.1 assigned to the coating side 7a with a blade or roller blade as a leveling or metering element 12.2 and of a backing roller 12.3 supporting the fibrous web 7 on the opposite side 7b during coating. Here, glue or starch for penetrating and strengthening the fibrous web 7 or even a pigment-containing coating color is used for the purpose of achieving good printability of the web page 7a. At the same time, a leveling and closing of the pores of the fibrous web 7 and, as stated, an improvement in the optical properties are achieved with the coater 12. At the same time, there is now a very good initial quality of the web surface for the following two (possibly also further) application layers.

Subsequent to an intermediate drying 13 and optionally to a further intermediate smoothing 14, at least one contour line completely covering the web is subsequently applied with at least one so-called 1: 1 applicator 15.

In the example chosen, a curtain coater 16 is provided for applying the following two contour lines or layers, which is shown in FIG FIG. 1 should be indicated with two curtain applicator heads 16.1. The two applicator heads 16.1 are arranged above and at a distance from the fibrous web 7 and could therefore be part of a single applicator 16 or even two successively arranged applicators 16 represent. With you a functional layer 17 and as a conclusion a protective layer 18 against environmental influences on the web 7 are applied. Due to the leveling done with the applicator 12, the subsequent functional layer 17 can be reduced in their layer thickness, thereby saving costs.

The function bar or the functional layer 17 may, for example, a Thermo layer, an NCR layer, a silicone layer, etc. The layer may also be intended to provide grease or water resistance.

The last layer or the coat forming the cover layer is transparent and is intended to serve as a protective layer 18 against environmental influences, fats, oils, water abrasion, etc.

• Figur 2 zeigt eine erste Variante. Angeordnet ist hier ein einziger Auftragskopf 16.1 mit parallelen Verteilkammern 16a. Aus jeder Verteilkammer 16a für das verwendete Auftragsmedium M bzw. M1 zweigt ein Zufuhrspalt 16b ab. Die Zufuhrspalte 16b vereinen sich am Austritt der Auftragskopfes 16.1 in einer gemeinsamen Abgabedüse 16c zur Abgabe eines doppelschichtigen Auftragsmedium-Vorhanges16 D.
  In Figur 2 ist in gepunkteter Linie die Deckschicht, d.h. die Schutzschicht 18 (resultierend aus der rechten, gezeichneten Verteilkammer) und in gestrichelter Linie die aus der linken Verteilkammer resultierende Funktionsschicht 17 dargestellt, die gemeinsam auf der Faserstoffbahn die Doppelschicht DS bilden.
• Figur 3 zeigt eine zweite Variante. Diese besteht darin, dass das Vorhang-Auftragswerk 16 zwei parallel in Laufrichtung der Faserstoffbahn gesehen, hintereinander angeordnete Auftragsköpfe 16.1 aufweist, die je eine Verteilkammer 16a, je einen Zufuhrspalt 16b und je eine Abgabedüse 16c zur Abgabe je eines einschichtigen Auftragsmedium-Vorhanges 16E enthalten. Die beiden Einzelvorhänge 16 E legen sich erst auf der Faserstoffbahn als Doppelschicht DS ab.
  In Figur 3 ist ebenfalls wie bei Figur 2 in gepunkteter Linie die Deckschicht, d.h. die Schutzschicht 18 (resultierend aus dem rechten Auftragskopf und der rechten Verteilkammer) und mit gestrichelter Linie die aus dem linken Auftragskopf bzw. der linken Verteilkammer resultierende Funktionsschicht 17 dargestellt.
• Figur 4 zeigt eine dritte Variante. Hierbei ist gezeigt, dass das Vorhang-Auftragswerk 16 zwei zueinander höhenversetzte, parallel in Laufrichtung L der Faserstoffbahn 7 gesehen, hintereinander angeordnete Auftragsköpfe 16.1 ebenfalls wieder mit je einer Zufuhrkammer 16a, je einem Zufuhrspalt 16b (beides hier aus Vereinfachungsgründen nicht eingezeichnet) und je einer Abgabedüse 16c zur Abgabe je eines einschichtigen Auftragsmedium-Vorhanges 16E aufweist.
  Unterhalb dieser einschichtigen Vorhänge 16E ist eine schräg gestellte Auffangplatte 20 angeordnet. Auf dieser Platte 20 legen sich die besagten Einzelvorhänge 16E übereinander ab und bilden eine Doppelschicht DS_P (wobei das P für Platte steht), die danach einen doppelschichtigen Auftragsmedium-Vorhang 16D bildet, der sich ebenfalls wie bei der Variante gemäß Figur 1 als Doppelschicht DS auf der Oberfläche der Faserstoffbahn 7 ablegt.
• Figur 5 zeigt eine vierte Variante. Hier weist das Vorhang-Auftragswerk 16 vom Typ eines sogenannten "Slide-Coaters", die auch "Slide Die" bezeichnet wird, zwar wieder nur einen einzigen Auftragskopf 16.1 auf, hat aber zueinander höhenversetzte, parallele Verteilkammern 16a. Im Beispiel sind zwei Verteilkammern gezeichnet. Es könnten bei weiteren Auftragsschichten auch noch entsprechend mehr sein. Die von den Verteilkammern 16a abzweigenden Zufuhrspalte 16b verlaufen nach oben in Richtung einer schräg nach unten verlaufenden Ablaufebene bzw. Gleitfläche 21, auf der sich das jeweils austretende Auftragsmedium zu einer Mehrfachschicht zu einer Doppelschicht DS_G vereint und ebenfalls wieder einen doppelschichtigen Auftragsmedium-Vorhang 16D bildet. Dieser doppelschichtige Vorhang 16D legt sich ebenfalls wieder als Doppelschicht DS auf die Bahnseite 7a ab.
  Aufgrund der Ausgestaltung des Auftragskopfes ist bei dieser Ausführungsform das aus der linken Verteilkammer resultierende Medium nun die Deck- bzw. Schutzschicht 18 und das aus der rechten Verteilkammer resultierende Medium die Funktionsschicht 17 bei gleicher Bahnlaufrichtung L, wie bei den vorherigen Figuren 2 bis 4 angegeben.

This can, as the following Figures 2 to .5 show, the application heads 16.1 be designed or act as follows:

• FIG. 2 shows a first variant. Arranged here is a single application head 16.1 with parallel distribution chambers 16a. From each distribution chamber 16a for the application medium used M or M1 branches off a supply gap 16b. The feed gaps 16b merge at the exit of the applicator head 16.1 into a common dispensing nozzle 16c for dispensing a double layer application medium curtain 16D.
  In FIG. 2 is the dotted line, the cover layer, ie the protective layer 18 (resulting from the right, drawn distribution chamber) and shown in dashed line resulting from the left distribution chamber functional layer 17, which together form the double layer DS on the fibrous web.
• FIG. 3 shows a second variant. This is that the curtain applicator 16 has two parallel viewed in the running direction of the fibrous web, successively arranged applicator heads 16.1, each containing a distribution chamber 16a, each supply gap 16b and a respective dispensing nozzle 16c for dispensing a single-layer application medium curtain 16E. The two individual curtains 16 E settle only on the fibrous web as a double layer DS.
  In FIG. 3 is also like at FIG. 2 the covering layer, ie the protective layer 18 (resulting from the right-hand application head and the right-hand distribution chamber), is shown in dotted line, and the functional layer 17 resulting from the left application head or the left distribution chamber is shown by a dashed line.
• FIG. 4 shows a third variant. Here it is shown that the curtain commissioned work 16 two mutually offset in height, seen in the direction L of the fibrous web 7, successively arranged applicator heads 16.1 also again each with a supply chamber 16a, each a supply gap 16b (both not shown here for reasons of simplification) and a respective dispensing nozzle 16c for delivering a single-layer Auftragmedium Curtain 16E has.
  Below this single-layered curtains 16E, an inclined collecting plate 20 is arranged. On this plate 20, the said individual curtains 16E overlap one another and form a double layer DS _P (where the P stands for plate), which then forms a double-layered application medium curtain 16D, which likewise acts as in the variant according to FIG FIG. 1 as a double layer DS deposits on the surface of the fibrous web 7.
• FIG. 5 shows a fourth variant. Here, the curtain applicator 16 of the type of a so-called "slide coater", which is also called "slide die", although again only a single application head 16.1, but has mutually offset in height, parallel distribution chambers 16a. In the example, two distribution chambers are drawn. It could also be correspondingly more in further order layers. The feed gaps 16b branching off from the distribution chambers 16a run upwards in the direction of an obliquely downward run-off plane or sliding surface 21, on which the respective emerging application medium combines to form a multiple layer to form a double layer DS _G and again forms a double-layer application medium curtain 16D , This double-layered curtain 16D likewise deposits again on the web side 7a as a double layer DS.
  Due to the design of the applicator head in this embodiment, the medium resulting from the left distribution chamber is now the cover or protective layer 18 and the medium resulting from the right distribution chamber the functional layer 17 at the same web running direction L, as in the previous FIGS. 2 to 4 specified.

In the FIGS. 2 to 5 all the media resulting from the right distribution chamber 6a are dotted and the ones resulting from the left chamber are dotted lines FIG. 5 In contrast to the FIGS. 2 to 4 the Functional layer 17 here in dotted line and the cover or protective layer 18, indicated in dashed line.

Following this multiple coating (here in the example, as described a triple coating) follows the above-mentioned drying with impingement dryers and drying cylinders existing and already named after-dryer section 8 and the designated reel 9 of the finished fibrous web. If desired, an after-smoothing 19 (not shown) with single-nip calenders or a multinip calender, for example a Janus calender known per se, can take place prior to winding up.

Overall, with the individual application layers 11, 17 and 18 a total of a high coating weight between 30 and 120 g / m ² , preferably 70 to 120 g / m ² , achieved, whereby a particularly good coverage over the entire web width is possible.

LIST OF REFERENCE NUMBERS

1

Fibrous web-making machine

2

headbox

3

Wire section

4

press section

5

drying cylinders

6

Pre-dryer section

7

Fibrous web

7a

coating side

7b

other side

8th

Afterdryers

9

Reeling

10

pre-smoothing

11

first order layer

12

Blade coater

12.1

application unit

12.2

Leveling or dosing element

12.3

backing roll

13

intermediate drying

14

between smoothing

15

1: 1 applicator

16

Curtain applicator

16.1

Curtain applicator head

16a

distribution chamber

16b

feed gap

16c

dispensing nozzle

16D

double layer application medium curtain

16E

Single or single-layered curtain

17

functional layer

18

Cover or protective layer

19

re-smoothing

20

sloping plate

21

Run-off plane or sliding surface

L

direction

M, M1

application medium

DS

bilayer

DS _P

Bilayer plate

DS _G

Double-layer slide

Claims (18)

Method for producing a coated fibrous web (7), in particular of paper or cardboard in a web-making machine (1), comprising the following steps: - web formation from a pulp mixture with a headbox (2) and a wire section (3); - drainage in a press section (4); - Predrying (6) to dry the formed fibrous web (7) at least to a residual moisture content; - coating at least one side (7a, 7b) of the fibrous web (7); - drying (8) and - reeling (9) of the fibrous web (7); characterized in that
in an on-line process, at least one web side (7a, 7b) of the fibrous web (7) is provided at least three times with application layers (11, 17, 18), wherein at least the last two application layers (17, 18) are provided with a 1: 1 applicator (15) directly and without intermediate drying, ie wet on wet. Method according to claim 1,
characterized in that
the first application layer (11) and / or a further or second application layer is applied in a direct manner by conventional methods, ie indirectly by means of a film applicator and / or with a doctor blade applicator (12). Method according to claim 1 or 2,
characterized in that
the first application layer (11) and / or the further or second application layer is likewise applied directly with a 1: 1 application unit (15). Method according to one of claims 1 to 3,
characterized in that
the first application layer (11) is a pigment-containing precoat, a middle application layer (17) is a functional layer and the last application layer (18) is a cover or protective layer. Method according to one of claims 1 to 4,
characterized in that
First, the first web page (7a) is painted multi-layered and then the second web page (7b) is coated in the same manner with the desired two-sided treatment. Method according to one of claims 1 to 5,
characterized in that
the application layers overall or per web side (7a, 7b) are between 30 and 120 g / m ² , preferably between 70 and 120 g / m ² . Method according to one of claims 1 to 6,
characterized in that
so that a special paper web is produced. Method according to one of claims 1 to 7,
characterized in that
as a 1: 1 commissioned work (15) a curtain coating commissioned work (16.1) or a spray applicator is used. Method according to one of claims 1 to 8,
characterized in that
either before the precoat or, the first application layer (11) and / or after the precoat or the first application layer (11) and / or before the reeling (9), a smoothing (10, 19) of the fibrous web is made. Machine for producing a coated fibrous web (7), in particular of paper or cardboard, comprising a headbox (2) and a wire section (3), a press section (4), a predrying (6), at least one device for coating at least one side of the Fibrous web (7), a final drying (8) and reeling (9),
marked by
for applying at least three application layers (11, 17, 18) to at least one web side (7a, 7b) of the fibrous web (7) for the at least two last application layers (17, 18) at least one 1: 1 applicator (15) means a curtain applicator (16) and / or a Sprühauftragswerk is provided without the arrangement of an intermediate drying device. Machine according to claim 10,
characterized in that
for the first application layer (11) or the precoat a conventional commissioned work, such as a blade coating device (12) for direct application or a film applicator for indirect application is provided. Machine according to claims 10 and 11,
characterized in that
for the at least two last application layers (17, 18), ie for a functional layer (17) and a cover or protective layer (18), as a 1: 1 applicator (15) a curtain applicator (16.1) with at least one above the fibrous web (7) and arranged spaced therefrom applicator head (16.1) is provided, wherein the applicator head (16.1) at least one medium distribution chamber (16a) and at least one, with the distribution chamber (16a) via a feed gap (16b) in connection standing Application or dispensing nozzle (16c) for a to be delivered to the underlying fibrous web (7) application medium curtain (16D, 16E) contains. Machine according to claim 12,
characterized in that
the curtain applicator unit (16) comprises a single application head (16.1) with parallel distribution chambers (16a), the supply gaps (16b) branching therefrom uniting in a common delivery nozzle (16c) for delivery of a double-layer application medium curtain (16D). Machine according to claim 12,
characterized in that
the curtain applicator (16) two parallel in the direction of (L) of the fibrous web (7) arranged successively arranged applicator heads (16.1), each with a distribution chamber (16a), each a feed gap (16b) and a respective dispensing nozzle (16c) for dispensing each having a single-layer application medium curtain (16E). Machine according to claim 12,
characterized in that
the curtain applicator (16) two mutually offset, parallel in the direction of (L) of the fibrous web (7), successively arranged applicator heads (16.1), each with a distribution chamber (16a), each a feed gap (16b) and a respective discharge nozzle (16c ) for dispensing each of a single-layer application medium curtain (16E), below which single-layer curtains (16E) an obliquely downward sloping collecting plate (20) is arranged, on which said curtains (16E) to a double layer (DS _P ) and form a double-layered application medium curtain (16D). Machine according to claim 12,
characterized in that
the curtain applicator unit (16) has a single applicator head (16.1) with mutually offset, parallel distribution chambers (16a) whose feed gaps (16b) branching out of them extend upward in the direction of an inclined progress plane or sliding surface (21) on which the each emergent application medium (M, M1) to form a double layer (DS _G ) and thereby forms a double-layer application medium curtain (16D). Machine according to at least one of claims 10 to 16,
characterized in that
Before and / or after the first commissioned work (12) and / or before the reeling (9) a smoothing device (10, 19) is arranged. Special paper paper,
characterized in that
It has been produced by a method according to claims 1 to 9 and in a machine according to claims 10 to 17.

Images