WO2021104742A1 - Bandes de pâte à papier de couchage - Google Patents

Bandes de pâte à papier de couchage Download PDF

Info

Publication number
WO2021104742A1
WO2021104742A1 PCT/EP2020/078991 EP2020078991W WO2021104742A1 WO 2021104742 A1 WO2021104742 A1 WO 2021104742A1 EP 2020078991 W EP2020078991 W EP 2020078991W WO 2021104742 A1 WO2021104742 A1 WO 2021104742A1
Authority
WO
WIPO (PCT)
Prior art keywords
application
fibrous web
web
nip
wet
Prior art date
Application number
PCT/EP2020/078991
Other languages
German (de)
English (en)
Inventor
Franziska FERRER
Sebastian Bläsing
Benjamin Méndez-Gallon
Christoph Henninger
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to EP20796503.9A priority Critical patent/EP4065769A1/fr
Priority to CN202080078258.7A priority patent/CN114667377B/zh
Publication of WO2021104742A1 publication Critical patent/WO2021104742A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH
    • D21H23/10—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH at least two kinds of compounds being added
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention relates to a system for producing a multi-coated fibrous web, in particular a cardboard or packaging web, according to the preamble of claim 1, and a corresponding method for production according to the preamble of claim 9.
  • the object is achieved by a system for producing a multi-coated fibrous web, in particular a cardboard or packaging web, the system having an application device for multi-layer application of at least a first application medium and a second application medium in a common treatment nip on a first side of the Includes fibrous web.
  • a wet smoothing device for pre-smoothing the fibrous web is arranged upstream of the application device in the running direction of the fibrous web.
  • wet smoothing devices per se are already known. They can be designed in various forms, for example as a Yankee or smoothing cylinder, as an offset press or the like. At higher machine speeds, the wet smoothing device can also be provided with a single felt (single felted smoothing press). In such wet smoothing devices, a relatively moist fibrous web - advantageously with a dry content of up to 65%, preferably between 35% or 40% and 60% dry content - can be smoothed and / or compacted.
  • the inventors have recognized that the high smoothness in connection with the compaction of the fibrous web or its surface is very advantageous for the application of multi-layer coatings, in particular of barrier coatings.
  • an improved holdout of the coating medium can be achieved by compressing the web.
  • the moist coating medium does not penetrate so deeply into the fibrous web.
  • the improved smoothness of the web enables the surface to be completely covered with smaller amounts of coating medium.
  • the Complete coverage of the surface is an essential criterion, especially for barrier applications. Since only a smaller amount of coating medium needs to be applied, the amount of moisture that is applied over it to the web is also reduced. This is an important advantage, especially with the very highly diluted barrier media.
  • this system can be expanded to include the option of applying multiple coatings, saving space and money.
  • a wet smoothing device - for example an offset press - can often be installed relatively easily in an existing system that already has a classic film press, for example. This film press can then also be converted into a multi-layer application mechanism quite easily. The existing drying facilities can then continue to be used.
  • the application device can also be set up to transfer not only the first application medium and the second application medium but also further application media in the common treatment nip.
  • a three-layer application can in particular also be advantageous. All known application media can be used as application media in the context of the present application.
  • starch solutions, pigment colors and barrier media such as PVA, EVAC etc. can be used.
  • the high dilution usually required for this is not Obstacle to use in an embodiment according to an aspect of the present idea.
  • the application media can be applied in a suitable viscosity.
  • the present invention is not limited to these viscosity ranges.
  • An advantageous embodiment can therefore be if the application device is designed as a film press, the treatment nip being formed by an application roller and a counter-element, in particular a counter-roller, and with application units being provided around the deposit the first application medium and the second application medium on top of one another on the application roller, which can be transferred together in the treatment nip onto the fibrous web.
  • an application medium is also applied to the second side of the fibrous web in the same application unit.
  • the application on the second side can be a single-layer application or a multi-layer application.
  • at least one, in particular all of the rollers of such a film press can have a roller hardness between 0 Pusey &
  • a contactless deflecting element can be provided directly after the application device, in particular directly after the film press. Because the application medium applied in multiple layers usually dries slowly, the web is often not yet sufficiently dry when this web has to be deflected for structural or technological reasons.
  • a non-contact deflection device for example a so-called "air turn" - such a deflection is possible even when the webs are still damp.
  • the wet smoothing device can in particular have a smoothing section - that is, the section in which the fibrous web is in contact with the wet smoothing device - which has a length of at least 10 mm, in particular more than 20 mm, preferably more than 500 mm. Depending on the design of the wet smoothing device, this distance can be significantly larger, for example 6 m or more.
  • the wet smoothing device can comprise or consist of a Yankee cylinder. These can be used in particular in systems for the production of paper that is smooth on one side (MG paper).
  • the wet smoothing device can comprise or consist of an offset press.
  • An offset press has a smooth press nip. In particular, it is unfelted.
  • An offset press is often designed as a non-felted roll nip.
  • An offset press is usually arranged in front of the entry of the fibrous web into the dryer section.
  • the wet smoothing can be carried out at the most suitable dry content of the fibrous web, regardless of which dry content of the web is required for the coating.
  • the system has a calender which is arranged after the wet smoothing device and before or after the application device is.
  • a calender can be used for calibrating the thickness of the fibrous web.
  • a calender can also be used to further optimize the surface roughness and / or the surface porosity.
  • calenders can also be provided, for example a hard-nip calender for calibrating the thickness, and a soft-nip calender or a belt calender to improve the surface quality.
  • the system comprises at least one degassing device for degassing the first application medium and / or the second application medium, wherein the degassing device can in particular be designed as a pump-like degasser.
  • Pump-like ventilators are known per se from the prior art, for example US Pat. No. 7,597,732. They usually work via a stator / rotor system and are used, for example, in the food industry for venting pasty media such as ketchup.
  • the process of gas-liquid separation is based on the strong centrifugal force generated by a separation impeller.
  • a vacuum is used here only for sucking off the separated air, but not for the actual gas-liquid separation.
  • pump deaerators have a larger capacity and can also be used to deaerate large amounts of application medium. This is particularly advantageous if, for example, the first application medium is applied in excess and then wiped off.
  • the object is achieved by a method for producing a multi-coated fibrous web, in particular a cardboard or packaging web, with at least a first application medium and a second application medium being applied to a first side of the fibrous web in a common treatment nip. It is provided that the fibrous web passes through a wet smoothing device before the common treatment nip.
  • the dry content of the fibrous web upon entry into the wet smoothing device can preferably be between 35% and 65%, in particular between 40% and 60%.
  • the temperature of the fibrous web in the wet smoothing device can be at least temporarily between 40 ° C and 120 ° C, in particular between 40 ° C and 60 ° C or between 80 ° C and 120 ° C.
  • the various wet smoothing devices can differ greatly within this framework.
  • both the dry content and the temperature of the fibrous web will tend to be in the lower range. Often temperatures between 40 ° C and 60 ° C combined with a dry content between 35% and 50% are used.
  • wet smoothing takes place, for example, by means of a Yankee cylinder
  • the web temperature will tend to be higher due to the heating of this cylinder alone.
  • Yankee cylinders are advantageously only used when the web has a higher dry content. Combinations are therefore common in which the web temperature is between 80 ° C and 120 ° C at least in places, and the dry content of the fibrous web when entering the wet smoothing device is greater than 45%, often between 50% and 60%.
  • wet smoothing device as well as the web temperature and dry content, can differ depending on the type of fibrous web produced on the system.
  • the fibrous web has a dry content of more than 85%, in particular between 88% and 98%, before it enters the treatment nip.
  • the fibrous web is additionally calendered by at least one calender nip, the web being dried to a dry content of more than 65% prior to calendering.
  • the fibrous web is moistened after reaching at least 65% dryness but before passing through a calender nip, in particular less than 15 g / m 2 of water, preferably between 5 g / m 2 and 10 g / m 2 are applied to the fibrous web in water.
  • the web In order to increase the efficiency of the calender or to suitably condition the fibrous web, provision can be made for the web to be tempered before it enters the calender nip. For some, it can be advantageous to heat the web after use. In other applications it can be advantageous to cool the web.
  • the tempering of the fibrous web and in particular the tempering of the first side of the fibrous web, can be implemented by applying a suitable fluid, for example water, steam or air, to the web, and in particular to the first side of the fibrous web.
  • a suitable fluid for example water, steam or air
  • FIG. 1 shows a section of a system for setting a fibrous web according to one aspect of the invention
  • FIGS. 2a and 2b each show an application device which is suitable for use in a system according to one aspect of the invention.
  • FIG. 3 shows a further application device which is suitable for use in a system according to one aspect of the invention.
  • FIG. 1 shows a section of a system for setting a fibrous web 1 according to one aspect of the invention.
  • the fibrous web 1 was formed on a sheet-forming section of the system, not shown in the figure. It is then transferred to a press section while it is still relatively moist - usually with a dry content between 10% and 20%.
  • the press section in FIG. 1 comprises, for example, a shoe press 10.
  • the fibrous web 1 generally runs through the press nip between two coverings that are not explicitly shown in FIG.
  • a wet smoothing device 4 in the form of a Yankee cylinder 4 is provided in the system.
  • the first side 1 a of the fibrous web 1 is advantageously in contact with the surface of the Yankee cylinder 44.
  • the wet smoothing effect is achieved directly on side 1a, which is to be coated in the following.
  • the fibrous web When entering the wet smoothing device 4, in this case when it is transferred to the Yankee cylinder 44, the fibrous web generally has a dry content of less than 60%, usually less than 50%.
  • the smoothing section that is to say the section on which the first side 1a of the fibrous web 1 is in contact with the Yankee cylinder 44, is usually very long. Modern Yankee cylinders can have a diameter of over 6m, even over 7m.
  • This Yankee cylinder 44 is heated from the inside, for example with steam.
  • a hood 41 is also provided, which is set up to apply hot gas to the second side 1b of the fibrous web 1 and thereby increase the drying effect.
  • the fibrous web 1 is heated as it passes through this wet smoothing device.
  • the web 1 can heat up considerably and at least temporarily reach temperatures between 80.degree. C. and 120.degree.
  • a calender 9 is provided in the system in FIG.
  • This calender 9 can advantageously be a soft nip calender 9, which in particular further smoothes or compresses the first side 1 a of the fibrous web 1.
  • a conditioning device 11 is also arranged in FIG. 1 in front of the entry into the calender nip. This is not absolutely necessary, but conditioning of the web 1 - and here especially the first side - by moistening and / or tempering can be advantageous.
  • At least one application device 2 is then provided for multi-layer application.
  • the application device shown here comprises an application roller 5 and a counter roller 6 which together form a common treatment nip 3 through which the fibrous web 1 passes.
  • Each of the two rollers 5, 6 can have a roller hardness between OP&J and 80 P&J.
  • the hardness of the two rollers 5.6 can be the same or different.
  • Two application units 7, 8 are provided for the application roller.
  • the first application unit 7 - for example a film application unit 7, applies a first application medium to the application roller.
  • a second application unit 8 - for example a spray or curtain application unit 8 - then deposits a second application medium onto the first application medium that has already been applied.
  • the two films from the first and second application medium are then transferred together in the common treatment nip 3 to the first side 1 of the fibrous web.
  • FIGS. 2a and 2b application devices 2 for multi-layer application are shown, which are suitable for a system according to one aspect of the invention.
  • the common treatment nip 3 is formed by two rollers 5, 6 through which the fibrous web is guided. It can be seen here that, in addition to the actual application roller 5, the counter roller 6 can also be used to apply application medium to the fibrous web 1. In both application devices 2 shown, both the first side 1a and the second side 1b of the fibrous web 1 are coated in the common treatment nip 3.
  • a multilayer application is even carried out on both sides 1a, 1b, namely in two layers, while in the embodiment in FIG. 2b, the second side 1b is only applied in one layer.
  • FIG. 2a two application mechanisms 7, 8 are arranged on application roller 5.
  • two application units 7a, 8a are arranged on the counter roll 6.
  • the commissioned works 7 and 7a as well as 8 and 8a are executed as identical commissioned works.
  • the commissioned units 7 and 7a are film commissioned units and the commissioned units 8 and 8a are curtain commissioned units.
  • other known commissioned works could also be used.
  • a film applicator unit 7, 7a is arranged on the applicator roller 5 and on the counter roller 6. On the counter roll 6, this is the only application unit. If an application is carried out via the counter roller 6, a single-layer application, as shown here by way of example, will often be advantageous.
  • FIG. 2b shows a further suitable application device 2. While the application roller 5 and its application units 7, 8 are designed as in FIG.
  • the band 60 can be designed as a plastic band or as a metal band.
  • an applicator 8a can also be arranged on the revolving belt 60 in order to also coat the second side 1b of the fibrous web.
  • this commissioned work 8a can also be dispensed with.

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  • Paper (AREA)

Abstract

L'invention concerne un système et un procédé de production d'une bande de pâte à papier à couches multiples, en particulier une bande de carton ou une bande d'emballage, le système comprenant un dispositif d'application permettant d'appliquer au moins un premier support d'application et un second support d'application sur un premier côté de la bande de pâte à papier dans de multiples couches dans une ligne de contact de traitement conjoint, un appareil de lissage par humidité permettant de prélisser la bande de pâte à papier étant disposé en amont du dispositif d'application dans le sens de déplacement de la bande de pâte à papier.
PCT/EP2020/078991 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage WO2021104742A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20796503.9A EP4065769A1 (fr) 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage
CN202080078258.7A CN114667377B (zh) 2019-11-29 2020-10-15 纤维材料幅的涂覆部

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019132446.7 2019-11-29
DE102019132446.7A DE102019132446A1 (de) 2019-11-29 2019-11-29 Beschichtung von Faserstoffbahnen

Publications (1)

Publication Number Publication Date
WO2021104742A1 true WO2021104742A1 (fr) 2021-06-03

Family

ID=73005580

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/078991 WO2021104742A1 (fr) 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage

Country Status (4)

Country Link
EP (1) EP4065769A1 (fr)
CN (1) CN114667377B (fr)
DE (1) DE102019132446A1 (fr)
WO (1) WO2021104742A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022105500A1 (de) * 2022-03-09 2023-09-14 Voith Patent Gmbh Auftragswerk und Verfahren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408A1 (de) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Verfahren zur Oberflächenveredelung einer Kartonbahn
DE10012257A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Auftragsvorrichtung
DE10245073A1 (de) * 2002-09-27 2004-04-01 Voith Paper Patent Gmbh Auftragsvorrichtung
WO2005052252A1 (fr) * 2003-11-28 2005-06-09 Voith Paper Patent Gmbh Machine a papier
DE102004036276A1 (de) * 2004-07-27 2006-02-16 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Aufbringen eines Auftragmediums in einer Maschine zur Herstellung einer Faserstoffbahn
DE102006057870A1 (de) * 2006-12-08 2008-06-12 Voith Patent Gmbh Mehrschichtauftrag

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005048927A1 (de) * 2005-10-13 2007-04-19 Voith Patent Gmbh Pressanordnung
DE102007009702A1 (de) * 2007-02-28 2008-09-04 Voith Patent Gmbh Verfahren zur Herstellung einer beschichteten Faserstoffbahn, insbesondere aus Papier oder Karton
DE102010013123A1 (de) * 2010-03-26 2011-09-29 SchäferRolls GmbH & Co. KG Verwendung einer mehrschichtig aufgebauten Walze
DE102010029615A1 (de) * 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
DE102010030081A1 (de) * 2010-06-15 2011-12-15 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen Faserstoffbahn
US20160038969A1 (en) * 2013-04-05 2016-02-11 Voith Patent Gmbh Film press
DE102017118222A1 (de) * 2017-08-10 2019-02-14 Voith Patent Gmbh Maschine und verfahren zur herstellung einer faserstoffbahn

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408A1 (de) * 1995-12-06 1997-06-12 Voith Sulzer Papiermasch Gmbh Verfahren zur Oberflächenveredelung einer Kartonbahn
DE10012257A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Auftragsvorrichtung
DE10245073A1 (de) * 2002-09-27 2004-04-01 Voith Paper Patent Gmbh Auftragsvorrichtung
WO2005052252A1 (fr) * 2003-11-28 2005-06-09 Voith Paper Patent Gmbh Machine a papier
DE102004036276A1 (de) * 2004-07-27 2006-02-16 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Aufbringen eines Auftragmediums in einer Maschine zur Herstellung einer Faserstoffbahn
DE102006057870A1 (de) * 2006-12-08 2008-06-12 Voith Patent Gmbh Mehrschichtauftrag

Also Published As

Publication number Publication date
CN114667377A (zh) 2022-06-24
EP4065769A1 (fr) 2022-10-05
DE102019132446A1 (de) 2021-06-02
CN114667377B (zh) 2023-10-27

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