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EP4065769B1 - Bandes de pâte à papier de couchage - Google Patents

Bandes de pâte à papier de couchage

Info

Publication number
EP4065769B1
EP4065769B1 EP20796503.9A EP20796503A EP4065769B1 EP 4065769 B1 EP4065769 B1 EP 4065769B1 EP 20796503 A EP20796503 A EP 20796503A EP 4065769 B1 EP4065769 B1 EP 4065769B1
Authority
EP
European Patent Office
Prior art keywords
application
fibrous web
web
nip
wet
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
EP20796503.9A
Other languages
German (de)
English (en)
Other versions
EP4065769A1 (fr
Inventor
Franziska FERRER
Sebastian Bläsing
Benjamin Méndez-Gallon
Christoph Henninger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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
Publication of EP4065769A1 publication Critical patent/EP4065769A1/fr
Application granted granted Critical
Publication of EP4065769B1 publication Critical patent/EP4065769B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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 plant for producing a multi-coated fibrous web, in particular a cardboard or packaging web, according to the preamble of claim 1, and to a corresponding method for producing the same according to the preamble of claim 8.
  • the object is achieved by a system for producing a multi-coated fibrous web, in particular a cardboard or packaging web, wherein the system comprises an application device for the multi-layer application of at least a first application medium and a second application medium in a common treatment nip to a first side of the 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.
  • the improved smoothness of the web allows for complete surface coverage with smaller amounts of coating medium.
  • Complete surface coverage is a crucial criterion, especially for barrier applications. Since only a smaller amount of coating medium needs to be applied, the amount of moisture applied to the web is also reduced. This is a significant advantage, especially for highly diluted barrier media.
  • a wet decurling system for example, an offset press
  • an offset press can often be relatively easily integrated into an existing system that already has a conventional film press, for example.
  • This film press can then also be converted quite easily to a multi-layer decurling system.
  • the existing drying equipment can then continue to be used.
  • the application device can also be configured to transfer additional application media in the common treatment nip in addition to the first application medium and the second application medium.
  • additional application media in the common treatment nip in addition to the first application medium and the second application medium.
  • a three-layer application can also be advantageous.
  • the application media can be applied in a suitable viscosity.
  • the present invention is not limited to these viscosity ranges.
  • the application device is designed as a film press, wherein the treatment nip is formed by an application roller and a counter element, in particular a counter roller, and wherein application units are provided in order to deposit the first application medium and the second application medium one above the other 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 to the second side can be a single-layer application or a multi-layer application.
  • At least one, and in particular all, of the rollers of such a film press can have a roller hardness between 0 Pusey & Jones (P&J) and 80 P&J, especially between 5 P&J and 50 P&J. If both rollers of such a film press have a roller hardness in the range between 0 P&J and 5 P&J (or even between 0 P&J and 1 P&J), this is often referred to as a "hard-nip application.”
  • a non-contact deflection element can be provided directly downstream of the application device, especially directly downstream of the film press.
  • the web is often not sufficiently dry when a deflection of this web is necessary for structural or technological reasons.
  • a non-contact deflection device for example, a so-called "air turn”—such deflection is possible even with still-moist webs.
  • the wet smoothing device can, in particular, have a smoothing section—that is, the section where the fibrous web is in contact with the wet smoothing device—that 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 section can be significantly longer, for example, 6 m or more.
  • the wet smoothing device can comprise or consist of a Yankee cylinder. These can be used particularly in plants for the production of one-side smooth paper (MG paper).
  • MG paper one-side smooth paper
  • the wet smoothing device can comprise or consist of an offset press.
  • An offset press has a smooth press nip. It is, in particular, unfelted.
  • An offset press is often designed as an unfelted roller nip.
  • An offset press is usually located before the fiber web enters the dryer section.
  • the system includes a calender located downstream of the wet smoothing device and upstream or downstream of the application device.
  • a calender can be used to calibrate the thickness of the fibrous web.
  • a calender can also be used to further optimize surface roughness and/or surface porosity.
  • calenders can also be provided, for example a hardnip calender for thickness calibration, as well as a softnip 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 be designed in particular as a pump-like degasser.
  • Pump-type deaerators are known per se. They usually operate via a stator/rotor system and are used, for example, in the food industry for deaerating pasty media such as ketchup. The process of gas-liquid separation is based on the strong centrifugal force generated by a separating impeller. The use of Vacuum is used here only to extract the separated air, not for the actual gas-liquid separation. Compared to the vacuum deaerators commonly used in the paper industry, pump-type deaerators have a greater capacity and can also be used to deaerate large quantities of coating medium. This is particularly advantageous when, for example, the first coating medium is applied in excess and then doctored off. In this case, usually over 90% of the coating medium—for example, the starch—is recycled. In this case, ten times more coating medium needs to be degassed than is applied to the web. This is where the use of pump-type deaerators is very advantageous.
  • the object is achieved by a method for producing a multiply coated fibrous web, in particular a cardboard or packaging web, wherein at least a first application medium and a second application medium are 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 when entering the wet smoothing device can 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.
  • wet smoothing device as well as the web temperature and dry content, may vary depending on the type of fibrous web produced on the plant.
  • the fibrous web has a dry content of more than 85%, in particular between 88% and 98%, before entering the treatment nip.
  • the fibrous web is additionally calendered by at least one calender nip, wherein the web is dried to a dry content of more than 65% before calendering.
  • the fibrous web is moistened after reaching at least 65% dry content but before passing through a calender nip, wherein in particular less than 15 g/m 2 of water, preferably between 5 g/m 2 and 10 g/m 2 of water is applied to the fibrous web.
  • the fibrous web it may be necessary to temper the web before entering the calender nip. Heating the web may be advantageous for some applications. Cooling the web may be advantageous for others.
  • Figure 1 shows a section of a plant for producing a fibrous web 1 according to one aspect of the invention.
  • the fibrous web 1 was formed on a sheet forming section of the plant (not shown in the figure). It is then transferred to a press section in a relatively moist state—usually with a dry matter content between 10% and 20%.
  • the press section in Figure 1 This includes, for example, a shoe press 10.
  • the fibrous web 1 usually runs between two coverings that are not explicitly mentioned in the Figure 1 shown, through the press nip.
  • the system features a wet smoothing device 4 in the form of a Yankee cylinder 4.
  • the first side 1a of the fibrous web 1 is in contact with the surface of the Yankee cylinder 44. This achieves the wet smoothing effect directly on the side 1a that is to be coated subsequently.
  • the fibrous web Upon entering the wet smoothing device 4, in this case upon transfer to the Yankee cylinder 44, the fibrous web typically has a dry content of less than 60%, usually less than 50%.
  • the smoothing section i.e., the section over which the first side 1a of the fibrous web 1 is in contact with the Yankee cylinder 44, is typically very long. Modern Yankee cylinders can have diameters of over 6m, even over 7m. However, even with a diameter of 4m and a wrap angle of only 180°, the smoothing section is over 6m.
  • This Yankee cylinder 44 is heated from the inside, for example, with steam.
  • a hood 41 is also provided, which is designed to apply hot gas to the second side 1b of the fibrous web 1, thereby increasing the drying effect. Due to the hot surface of the Yankee cylinder 44 and the exposure of the web to hot gas from the hood, the fibrous web 1 heats up as it passes through this wet smoothing device. The web 1 can heat up considerably and, at least temporarily, reach temperatures between 80°C and 120°C.
  • Figure 1 a calender 9 is provided.
  • This calender 9 can advantageously be a soft nip calender 9, which in particular further smooths or compacts the first side 1a of the fibrous web 1.
  • Figure 1 A conditioning device 11 is also arranged. This is not absolutely necessary, but conditioning the web 1—and here especially the first side—by moistening and/or tempering can be advantageous.
  • At least one application device 2 for multi-layer application is provided downstream of the calender 9, at least one application device 2 for multi-layer application is provided.
  • 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 0 P&J and 80 P&J.
  • the hardness of the two rollers 5, 6 can be the same or different.
  • 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 already applied first application medium. The two films of the first and second application medium are then transferred together to the first side 1 of the fibrous web in the common treatment nip 3.
  • the common treatment nip 3 is formed by two rollers 5, 6, through which the fibrous web 1 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.
  • Two application units 7, 8 are arranged on the application roller 5.
  • Two application units 7a, 8a are also arranged on the counter roller 6.
  • application units 7 and 7a as well as 8 and 8a are designed as identical application units.
  • Application units 7 and 7a are film application units and the Applicators 8 and 8a are curtain applicators. However, other known applicators could also be used.
  • a film application unit 7, 7a is arranged on the application roller 5 and on the counter roller 6. This is the only application unit on the counter roller 6. If application is carried out via the counter roller 6, a single-layer application as shown here as an example will often be advantageous. However, multi-layer application via the counter roller 6 is not excluded. On the application roller in Figure 2b Another application unit 8 is arranged. This is designed as a so-called 'multilayer curtain'. Here, a two-layer film of application medium is deposited onto the application roller 5 in a single application unit 8. Together with the layer from the film application unit 7, this example results in a three-layer application.
  • the film application unit 7 of the application roller 5 when executed according to Figure 2b can be omitted, so that a two-layer application takes place via the application roller 5.
  • Figure 3 shows another suitable application device 2. While the application roller 5 and its application units 7, 8 as in Figure 2a are executed, consists in Figure 3
  • the counter element 6a does not consist of a counter roller 6, but of a rotating belt 60.
  • the common treatment nip 3 is created by pressing the belt 60 against the application roller 5.
  • the resulting common treatment nip 3 is significantly longer than the roller nips shown above.
  • the belt 60 can be designed as a plastic belt or a metal belt.

Landscapes

  • Paper (AREA)

Claims (13)

  1. installation pour la fabrication d'une bande fibreuse (1) à enduction multiple, en particulier une bande de carton ou d'emballage, dans laquelle l'installation
    comprend un dispositif d'enduction (2) pour l'application multicouche d'au moins un premier agent d'enduction et d'un deuxième agent d'enduction dans une ligne de traitement (3) commune sur une première face (1a) de la bande fibreuse (1), caractérisée en ce que, dans le sens d'avancement de la bande fibreuse (1), avant l'étape d'enduction, la bande fibreuse (1) est enduite d'un deuxième agent d'enduction.
    dispositif d'application (2), un dispositif de lissage humide (4, 40) est disposé pour le pré-lissage de la bande fibreuse (1), et en ce que le dispositif d'application
    (2) est conçu comme une presse à film, la ligne de traitement commune étant
    (3) est formé par un rouleau applicateur (5) et un contre-élément (6, 6a), en particulier un contre-rouleau (6), , et où
    Des dispositifs d'application (7, 7a, 8, 8a) sont prévus pour déposer le premier milieu d'application et le deuxième milieu d'application l'un sur l'autre sur le rouleau d'application (5), lesquels peuvent être transférés ensemble dans la ligne de contact de traitement (3) sur la bande fibreuse (1).
  2. Installation selon l'une des revendications précédentes, caractérisée en ce qu'un élément de déviation sans contact est prévu directement après le dispositif d'application, en particulier directement après la presse à film.
  3. Installation selon l'une des revendications précédentes, caractérisée en ce que le dispositif de lissage humide (4, 40) présente une section de lissage qui a une longueur d'au moins 10 mm, en particulier de plus de 20 mm, de préférence de plus de 500 mm.
  4. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de lissage humide (4, 40) comprend, ou est constitué par, un cylindre Yankee (40).
  5. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de lissage humide (4) comprend ou est constitué d'une presse offset.
  6. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'installation comprend une calandre (9) disposée en aval du dispositif de lissage humide (4, 40) et en amont ou en aval du dispositif d'application (2).
  7. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'installation comprend au moins un dispositif de dégazage pour dégazer le premier milieu d'application et/ou le second milieu d'application, où le dispositif de dégazage notamment que dégazeur de type pompe.
  8. Procédé de fabrication d'une bande fibreuse (1) à enduction multiple, en particulier d'une bande de carton ou d'emballage (1), dans lequel au moins un premier milieu d'enduction et un deuxième milieu d'enduction sont appliqués en une seule couche.
    une ligne de contact de traitement commune (3) sur une première face (1a) de la bande fibreuse (1), caractérisé en ce que la bande fibreuse (1) traverse un dispositif de lissage humide (4, 40) avant la ligne de contact de traitement commune (3) et en ce que le dispositif d'enduction (4, 40) est conçu de manière à ce que la bande fibreuse (1) ne puisse pas être lissée.
    (2) est réalisé sous la forme d'une presse à film, la ligne d'alimentation commune de traitement
    (3) est formé par un rouleau d'application (5) et un contre-élément (6, 6a), en particulier un contre-rouleau (6), et dans lequel des dispositifs d'application (7, 7a, 8, 8a) sont prévus pour déposer le premier milieu d'application et le deuxième milieu d'application l'un au-dessus de l'autre sur le rouleau d'application (5), qui sont placés ensemble dans la pince de traitement (3).
    sur la bande fibreuse (1).
  9. Procédé selon la revendication 8, caractérisé en ce que la teneur en matière sèche de la bande fibreuse (1) à l'entrée dans le dispositif de lissage humide (4, 40) est comprise entre 35% et 65%, en particulier entre 30% et 30%.
    entre 40% et 60%.
  10. Procédé selon l'une des revendications 8 ou 9, caractérisé en ce que la température de la bande fibreuse (1) dans le dispositif de lissage humide (4, 40) est comprise au moins temporairement entre 40°C et 120°C, notamment entre 40°C et 60°C ou entre 80°C et
    120°C.
  11. Procédé selon l'une quelconque des revendications 8 à 10, caractérisé en ce que la bande fibreuse (1) présente, avant son entrée dans la ligne de contact de traitement commune (3), une teneur en matière sèche supérieure à
    85%, en particulier entre 88% et 98%.
  12. Procédé selon l'une quelconque des revendications 8 à 11, caractérisé en ce que la nappe fibreuse (1) est en outre encore calandrée par au moins une ligne de contact de calandrage, la nappe (1) étant soumise avant
    le calandrage est séché à une teneur en matière sèche supérieure à 65%.
  13. Procédé selon la revendication 12, caractérisé en ce que la bande fibreuse (1) après atteint de au moins 65%.
    teneur en matière sèche, mais est humidifiée avant le passage d'une pointe de calandre, en particulier moins de 15 g/m2 d'eau, de préférence entre 5 g/m2 et 10 g/m2 d'eau étant appliqués sur la bande fibreuse (1).
EP20796503.9A 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage Active EP4065769B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019132446.7A DE102019132446A1 (de) 2019-11-29 2019-11-29 Beschichtung von Faserstoffbahnen
PCT/EP2020/078991 WO2021104742A1 (fr) 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage

Publications (2)

Publication Number Publication Date
EP4065769A1 EP4065769A1 (fr) 2022-10-05
EP4065769B1 true EP4065769B1 (fr) 2025-08-13

Family

ID=73005580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20796503.9A Active EP4065769B1 (fr) 2019-11-29 2020-10-15 Bandes de pâte à papier de couchage

Country Status (6)

Country Link
EP (1) EP4065769B1 (fr)
CN (1) CN114667377B (fr)
DE (1) DE102019132446A1 (fr)
FI (1) FI4065769T3 (fr)
PL (1) PL4065769T3 (fr)
WO (1) WO2021104742A1 (fr)

Families Citing this family (2)

* 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
DE102023108252A1 (de) 2023-03-31 2024-10-02 Voith Patent Gmbh Maschine und Verfahren

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19545408C5 (de) * 1995-12-06 2004-01-22 Voith Sulzer Papiermaschinen 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
DE102005048927A1 (de) * 2005-10-13 2007-04-19 Voith Patent Gmbh Pressanordnung
DE102006057870A1 (de) * 2006-12-08 2008-06-12 Voith Patent Gmbh Mehrschichtauftrag
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
WO2014161755A1 (fr) * 2013-04-05 2014-10-09 Voith Patent Gmbh Presse de pelliculage
DE102017118222A1 (de) * 2017-08-10 2019-02-14 Voith Patent Gmbh Maschine und verfahren zur herstellung einer faserstoffbahn

Also Published As

Publication number Publication date
FI4065769T3 (fi) 2025-11-12
CN114667377A (zh) 2022-06-24
DE102019132446A1 (de) 2021-06-02
CN114667377B (zh) 2023-10-27
PL4065769T3 (pl) 2026-01-19
EP4065769A1 (fr) 2022-10-05
WO2021104742A1 (fr) 2021-06-03

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