EP4524323A1 - Procédé de production d'un substrat en papier - Google Patents

Procédé de production d'un substrat en papier Download PDF

Info

Publication number
EP4524323A1
EP4524323A1 EP23197987.3A EP23197987A EP4524323A1 EP 4524323 A1 EP4524323 A1 EP 4524323A1 EP 23197987 A EP23197987 A EP 23197987A EP 4524323 A1 EP4524323 A1 EP 4524323A1
Authority
EP
European Patent Office
Prior art keywords
mfc
paper
substrate
layer
calendering
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.)
Pending
Application number
EP23197987.3A
Other languages
German (de)
English (en)
Inventor
Alba SANTMARTI
Tjerk BOERSMA
Pierluigi MASI
Giulia DAL MOLIN
Barbara BUSNARDO
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.)
Sappi Papier Holding GmbH
Original Assignee
Sappi Papier Holding 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 Sappi Papier Holding GmbH filed Critical Sappi Papier Holding GmbH
Priority to EP23197987.3A priority Critical patent/EP4524323A1/fr
Priority to PCT/EP2024/075460 priority patent/WO2025061556A1/fr
Publication of EP4524323A1 publication Critical patent/EP4524323A1/fr
Pending legal-status Critical Current

Links

Images

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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H19/10—Coatings without pigments
    • D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
    • D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/52—Cellulose; Derivatives thereof
    • 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
    • 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
    • D21H23/24—Addition to the formed paper during paper manufacture
    • D21H23/26—Addition to the formed paper during paper manufacture by selecting point of addition or moisture content of the paper
    • 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
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

Definitions

  • the present invention relates to a method to produce a paper substrate for functionalized papers for packaging applications as well as a functionalized paper based on this substrate, a packaging material based on the functionalized paper and the use of this functionalized paper.
  • the products are packaged in a packaging.
  • the appropriate packaging needs to be selected depending on the packaged product, as well as depending on the substances that are to be kept from damaging the product.
  • One way to achieve the desired protection is to provide the package with a barrier.
  • WO 2011/078770 A1 ( EP 2 516 156 B1 ) relates to a paper or paperboard substrate having barrier properties which substrate comprises a first fiber based layer, a second layer comprising 0.1-10 g/m2 (dry) microfibrillated cellulose with a length of 10-100 ⁇ m and a third layer comprising a polymer wherein said polymer is any of the following polymers: polyethylene (PE), polyethylene terephthalate (PET), polyvinyl alcohol (PVOH), polyvinyl acetate (PVA), polypropylene (PP) and/or polyamide (PA).
  • the second layer of the substrate is preferably attached to the first layer and the third layer is preferably attached to the second layer of the paper or paperboard substrate.
  • the paper or paperboard substrate comprises three layers and the second layer comprising microfibrillated cellulose is located in between the first fiber based layer and the third polymer layer.
  • WO 2016/097964 A1 ( EP 3 234 260 B1 ) relates to a process for the production of a coated substrate comprising cellulosic fibers, the process comprising the steps of: i) providing a substrate comprising cellulosic fibers and having a dry content of less than 50% by weight; ii) applying a coating composition to the substrate in a total amount of more than 5 g/m2, especially between 10 g/m2 and less than 40 g/m2, calculated as dry weight of the coating composition, wherein the coating composition comprises: microfibrillated cellulose (MFC), and especially a water retention agent being carboxymethyl cellulose (CMC) in an amount of at least 3% up to 8.5% by weight, calculated as dry weight and based on the dry weight of the MFC; and iii) mechanically dewatering the first substrate.
  • MFC microfibrillated cellulose
  • CMC carboxymethyl cellulose
  • the water retention agent used in WO 2016/097964 A1 can also be selected from carboxymethyl cellulose (CMC), anionic polyacrylamide (A-PAM),sodium polyacrylates, polyacrylic acid derivatives, guar gum, alginate, MFC prepared from carboxymethylated fibers, MFC prepared from oxidized fibers, MFC prepared by CMC- functionalized fibers, and/or combinations thereof.
  • CMC carboxymethyl cellulose
  • A-PAM anionic polyacrylamide
  • sodium polyacrylates polyacrylic acid derivatives
  • guar gum guar gum
  • alginate alginate
  • MFC prepared from carboxymethylated fibers MFC prepared from oxidized fibers
  • MFC prepared by CMC- functionalized fibers and/or combinations thereof.
  • WO 2013/188739 A1 ( EP2861800B1 ) is related to a release base paper and the method of its manufacture, wherein the method for producing such a release base paper comprises: i) manufacturing a release base paper with a paper-making furnish having a fiber freeness (CSF) of 180 ml or higher; ii) pressing the furnish into a web of paper; iii) drying the pressed web; and iv) calendering the web to form a release base paper, wherein the release base paper is manufactured with nano-fibrillated cellulose added to the release base paper by means of at least one of: (i) incorporation into the furnish at a loading concentration of from about 10 to about 400 Ibs/ton; and (ii) coating on the web of paper at a coating rate of about 0.2 to about 12 g/m.
  • CSF fiber freeness
  • WO 2022/049484 A1 discloses a method for manufacturing a multilayer machine glazed paper comprising highly refined cellulose fibers, especially microfibrillated cellulose (MFC), the method comprising the steps of: a) forming a first wet web by applying at least one first pulp suspension comprising highly refined cellulose fibers on a first wire; b) partially dewatering the first wet web to obtain a first partially dewatered web; c) forming a second wet web by applying at least one second pulp suspension comprising highly refined cellulose fibers, especially microfibrillated cellulose (MFC), on a second wire: d) partially dewatering the second wet web to obtain a second partially dewatered web; e) joining the first and second partially dewatered web to obtain a multilayer web; f) optional dewatering the multilayer web in a dewatering unit, and g) glazing the multilayer web in at least one glazing unit, especially a Yankee cylinder, a glassine calender or
  • the manufacturing method according to WO 2022/049484 A1 involves the separate preparation and partial dewatering of at least two webs, the two webs having a lower grammage compared to the finalized multilayer MG paper.
  • the partially dewatered but still wet webs are joined to form a higher grammage multilayer web, which is subsequently further dewatered and dried to obtain a more dry multilayer web.
  • the microfibrillated cellulose is laminated onto the substrate.
  • Such a method also encompasses a method for manufacturing paper or paperboard with low Bendsten porosity and roughness to be used as a substrate to support coatings for barrier papers or other functionalities.
  • a method to produce a coated paper substrate for functional papers for packaging applications comprising: forming an initial fiber-based wet substrate with solid contents between 4-20 wt.% on a wire; applying a microfibrillated cellulose (MFC) fiber suspension with solid contents between 1 and 30 g/L on top of the fiber-based wet substrate on the wire at the forming table of a paper machine to form a uniform substrate layer; drying of the uniform substrate layer with a moisture content ranging from 0.5 wt.% and 12 wt.%; and inline or offline calendering of the uniform substrate layer, creating a calendered MFC coated substrate.
  • MFC microfibrillated cellulose
  • One of the methods to apply a layer of MFC on top of paper is by means of wet end application. Whilst this method is relatively feasible to scale-up and produce MFC precoated papers at industrial scale at economically viable machine speeds, the as-produced paper has a much higher roughness than most latex-precoated papers used as substrates for functional barrier coatings and this roughness can lead to defects when applying barrier coatings on top.
  • MFC is applied in the wet end of a paper machine and it is dewatered via filtration, some pinholes are still present in the MFC layer which act as water pathways during the dewatering process but are not desirable in substrates used for subsequent coating.
  • MFC-precoated papers are subjected to a pressure and heat treatment (calendering) to further close the surface porosity and smoothen the paper to make it a suitable substrate for barrier or other functional coatings.
  • the MFC fiber suspension is prepared based on Bleached Kraft Eucalyptus pulp or sulphite beech pulp or bleached birch pulp.
  • both hardwood and softwood pulps can be used, however hardwood pulps are preferred over softwoods.
  • a rewetting step is introduced between the drying and the calendering step.
  • the rewetting of the paper can be performed up to 10% or 12% - 18%, before the calendering.
  • Wet stack or multi-nip calendering is typically done with three or more rolls and two or more nips.
  • wet stack water is added to the sheet surface in between one or more nips using water boxes. The added moisture and applied nip pressure develop uniform nip pressure profile and good smoothness of sheet.
  • the rewetting can also happen during calendering, i.e. in a wet stack application,
  • the coated paper substrate can be used as barrier paper but can also be preferably coated with one or more specific layers of barrier coatings after the calendering step. There can be one single additional barrier coating, there can be two or more barrier coating layers.
  • a packaging material comprising the barrier paper according to the first object, where the food packaging material is configured such that the barrier paper is in direct contact with the packaged material when in use.
  • Such packaged material can be a food or non-food product.
  • Fig. 1A shows a cross-section SEM image of a calendered (at 100 kN/m) MFC-precoated substrate 5 with two barrier coatings 30, 31 on top at a first magnification.
  • the MFC-precoated substrate 5 comprises a base paper substrate 10 and a MFC layer 20 which is difficult to spot as it has the same composition as the fibers forming the base paper substrate 10.
  • the fibers of the MFC layer 20 might penetrate into the base paper and not stay completely on the surface.
  • Reference numeral 80 indicates the area of Fig. 1A which is shown in Fig. 2A which is a cross-section SEM image of the substrate of Fig. 1A at a second magnification which is 10 times higher.
  • a method to produce a coated paper substrate for functional papers for packaging applications comprises: forming an initial fiber-based wet substrate with solid contents between 4-20 wt.% on a wire;
  • coated substrate 5' is also named precoated substrate since it can be treated in additional further steps.
  • the SEM images of Fig. 1A and 2A show a first barrier coating 30 and a second barrier coating 31 applied on top of the uniform substrate layer 5. It can be seen that, when the uncalendered substrate layer 5 is used as basis to apply the barrier coatings 30 and 31, the entire paper substrate is rough and the thin MFC fiber coating 20 follows the roughness of this paper substrate whereas the calendered MFC precoated substrate 5' allows the barrier coating 30 to be applied on a far smoother surface. In fact, when the MFC is applied with the wet end applicator it contours the original roughness of the substrate on which it is applied. Therefore, based on a paper substrate with a high roughness, the MFC coating layer 20 will follow this roughness too until the calendering step.
  • the coat weight of the MFC layer 20 can range from 1 to 20 gsm, the example/embodiments shown in Fig. 1 uses a coat weight of 8 gsm.
  • Fig. 1B shows a cross-section SEM image of a calendered (at 100 kN/m) MFC-precoated substrate with two barrier coatings 30, 31 on top at a first magnification.
  • the calendering uses a, or a multi-nip calender, or a soft-nip calender, or a belt calender.
  • the temperature applied is preferably above 100°C, preferably between 110-190°C. It is optional and may even be preferred that before calendering, the MFC pre-coated paper substrate is rewetted to increase its moisture content and make it more malleable during the calendaring process
  • the MFC side of the uniform substrate layer will be in direct contact with the calender
  • the pressure applied can be between 10 kN/m and 400 kN/m, especially from 80kN/m to 300kN/m
  • the base paper layer of the barrier paper is obtained from a paper machine or paperboard machine having a drying section equipped with Yankee dryers.
  • the treatment in the calender can be done inline.
  • the calendering step can be a supercalendering step.
  • the calendering process is related to smoothening the surface of the uniform substrate layer to provide it with low surface roughness values.
  • Different parameters as well as calendering techniques can be used to achieve this: rewetting of the uniform substrate layer prior to calendering to increase the moisture content and aid the smoothening of the uniform substrate layer before calendering, increased temperature during the calendering process, increased dwell time during the calendering process.
  • a calender unit a calender with a higher amount of nips, or a belt calender with a longer nip, or different nip materials in contact with the paper.
  • a rewetting step is introduced between the drying and the calendering step.
  • the rewetting can especially comprise the feature of increasing moisture from 2-7% to 10-18%. This can be achieved by water spraying or water vapour, on one side of the paper or on both sides. This can be performed at a speed from 200 to 1500m/min.
  • a residence time before calendering can be chosen to be between from 1 to 24h.
  • one or more coating layer 30, 31 before calendering especially an additional coating with a barrier layer.
  • Such layers can be starch or PVOH with coat weights between 0.2 and 3.0 gsm.
  • Such coatings can be applied with speed sizer, film press and other means.
  • the rewetting can take place before the further coating. It is also possible that a first layer coating 30 could be applied before the calendering step by using an inline coater such as a speed sizer. The optional second coating layer can be applied after calendering
  • Fig. 1C shows a cross-section SEM image of a calendered MFC-precoated substrate 5' with two barrier coatings 30, 31 on top at a first magnification, just calendered at 280 kN/m. Therefore, identical reference numerals are used in Fig. 1C and the ten times higher magnification image 2C.
  • Fig. 1D shows a comparative example of a cross-section SEM image of a calendered (at 280 kN/m) substrate without MFC-precoating with two barrier coatings 30, 31 on top at a first magnification and Fig. 2D the detail view of Fig. 1D at a higher magnification
  • the properties of the MFC precoated calendered paper before an optional further coating step with a barrier layer are evaluated based on:
  • Type 1 is MFC from Kraft eucalyptus
  • type 2 is MFC from beech sulphite.
  • the prepared examples and comparative examples show:
  • the method can furthermore comprise a further coating step:
  • the presence of the MFC layer 20 within the uniform substrate layer 5' has the function to densify and seal the base paper surface porosity to ensure a good holdout of the functional layers applied on top of the uniform substrate layer.
  • the MFC layer contours the surface roughness of the fiber-web substrate onto which it is being applied and therefore it does not have a major impact in reducing its roughness.
  • functional coatings such as barrier coatings are applied on top of a substrate, smoothness is an important parameter. If a thin layer is applied and a substrate is rougher, it will be more difficult to obtain a perfect coverage than if the substrate is smoother.
  • Rougher substrates can lead to uncoated areas or areas in which the coating thickness is not uniform. This can cause defects (pinholes) or irregular barrier properties with high standard deviations due to the unevenness of the barrier coating thickness applied.
  • the calendering can use a pressure of between 10 kN/m and 400 kN/m, especially between 80 kN/m and 300 kN/m.
  • the temperature applied can be in the range between 80 and 150 degree Celsius.
  • the first barrier coating is 'sizing' the MFC surface to make it less susceptible to water when the second layer is applied.
  • Fig. 1B and 1C show cross-section SEM images 101, 102 showing different MFC-precoated substrates 5' with barrier coatings 30, 31 on top.
  • the SEM image 100 in Fig. 1A and 2A shows a paper, not according to the invention, where the barrier coatings 30, 31 have been applied to an uncalendered substrate 5 comprising the fiber base layer 10 and the MFC layer 20.
  • the SEM image 103 in Fig. 1D shows a paper, not according to the invention, where the barrier coatings 30, 31 have been applied to a base paper substrate without a MFC precoating..
  • Fig 1B and 1C are specifically the cross-sections of the MFC precoated samples with the following coatings applied on top: layer 30 has 2.5 gsm of a first coating, layer 31 has 9.5 gsm of a second coating.
  • Table 2 correspond to the samples shown in Fig. 1A to 1D .
  • the four entries in Table 2 correspond to the four examples/comparative samples of Fig. 1A to Fig. 1D .
  • Table 2 and Fig. 1A to 1D illustrate the effect of calendering through the substrate properties such as smoothness on the performance of the MFC-precoated substrates as a support for barrier polymers.
  • the construct of the functional papers described here are: Base paper + 8 gsm MFC + two barrier polymer layers applied on top (2.5 gsm first coating + 9.5 gsm second coating).
  • Fig. 3A to Fig. 3D show the amount of defects (pinholes) 210 for four papers 200, 201, 202 and 203, respectively which are based on the four examples 100. 101. 102. 103 of Fig. 1A to Fig. 1D , respectively.
  • Fig. 3A to Fig. 3D show each a view from above on a paper based for Fig. 3A to Fig. 3C on MFC-precoated substrates with barrier coatings on top and Fig. 3D on a paper without MFC with barrier coatings on top, wherein, subsequently, a blue dye was applied for 10 min to identify coating defects 210. The application of a blue dye allows to identify coating defects 210.
  • the uncalendered paper sample 200 is too rough to even obtain grease barrier performance and shows too many coating defects 210.
  • the calendered paper sample 201 is smooth enough to obtain grease barrier performance, medium WVTR performance but too rough to get oxygen barrier (OTR).
  • OTR oxygen barrier
  • the supercalendered paper sample 202 does not show any coating defects.
  • the supercalendered paper is smooth enough to have all barrier properties on target (oxygen, water vapor and grease).
  • the calendered paper without MFC 203 shows pinhole defects 210.
  • the barrier layer construct which is characterized on parameters relating to the number of layers, different types of coatings, different barrier layer thickness, coat weights, viscosity barrier coating, etc. will achieve different results but the baseline teaching of the samples 200, 201, 202 and 203 is that a (super)calendered MFC coated fiber substrate provide in any case sufficient performance relating to defects as pinholes, independent from any barrier coating applied later on.
  • the Bleached Kraft Eucalyptus pulp can be prepared as described in https://www.eucalyptus.com.br/icep02/jorge colodette.pdf.
  • Fines are defined as the fine cellulosic particles, which are able to pass through a 200 mesh screen (according to ARTM being equivalent to a hole diameter of 76 ⁇ m (micrometer)) of a conventional laboratory fractionation device.
  • the MFC-precoated substrate When the barrier coating is applied in only one step the MFC-precoated substrate is more open, absorbs the water-based coating faster and this might lead to creation of coating defects but which are acceptable for functionalized papers.
  • the barrier coating 30 was applied in two steps with a 2.5 gsm first barrier coating and a 9.5 gsm second barrier coating layer. In samples with one single barrier coating, the resulting paper was rougher but still provided a decent performance as functionalized paper.
  • the MFC layer can also be a mix of MFC fibers and additives such as CMC, starch, etc.. Specifically, adding a sizing agent such as AKD to the MFC makes the MFC layer more hydrophobic.
  • the base paper layer 10 may be a paper or paper-board layer, which may be formed from a mixture of paper pulp and mineral particles such as fillers, pigments or sizing materials.
  • Suitable paper pulp may be sourced from either virgin or recycled pulp sources.
  • An example of a recycled pulp source is deinked pulp.
  • Virgin pulp sources are plant materials such as wood, rice straw, bagasse, bamboo, sisal, and others.
  • the paper pulp forming the base paper layer is chemical wood pulp such as Kraft or sulfite wood pulp, and is more preferably a bleached chemical wood pulp.
  • Suitable bleached chemical wood pulps are northern bleached softwood kraft (NBSK), southern bleached softwood kraft (SBSK) or dissolving pulp.
  • the mineral particles in the base paper layer are formed of minerals chosen from calcium carbonate, talcum, gypsum or titanium dioxide, aluminum phyllosilicate clays such as kaolin clay.
  • a paper machine or a paperboard machine includes several section, starting with a wet section, or wet end, where a web of wet paper precursor is formed by discharging a paper furnish onto a formation table, where the furnish is drained of some water mainly by suction.
  • the paper precursor is passed through dewatering devices which remove water via mechanical action, such as for example rolls that squeeze the paper precursor to dewater the paper precursor.
  • the "dewatered" paper precursor which is still moist, transits into the dryer section, where drying devices such as heated rolls, infrared heaters, and hot air heaters remove the remaining moisture from the dewatered paper precursor.
  • the dewatered paper precursor When dried in the dryer section, the dewatered paper precursor tends to shrink, in both machine direction as well as in cross direction, unless the drying shrinkage is prevented in some way.
  • the dewatered paper base layer is dried to form the paper base layer using said drying device, which drying device is configured to prevent drying shrinkage.

Landscapes

  • Paper (AREA)
EP23197987.3A 2023-09-18 2023-09-18 Procédé de production d'un substrat en papier Pending EP4524323A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23197987.3A EP4524323A1 (fr) 2023-09-18 2023-09-18 Procédé de production d'un substrat en papier
PCT/EP2024/075460 WO2025061556A1 (fr) 2023-09-18 2024-09-12 Procédé de production de substrat en papier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23197987.3A EP4524323A1 (fr) 2023-09-18 2023-09-18 Procédé de production d'un substrat en papier

Publications (1)

Publication Number Publication Date
EP4524323A1 true EP4524323A1 (fr) 2025-03-19

Family

ID=88204181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23197987.3A Pending EP4524323A1 (fr) 2023-09-18 2023-09-18 Procédé de production d'un substrat en papier

Country Status (2)

Country Link
EP (1) EP4524323A1 (fr)
WO (1) WO2025061556A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001288692A (ja) * 2000-03-31 2001-10-19 Oji Paper Co Ltd 紙の製造方法
WO2011078770A1 (fr) 2009-12-21 2011-06-30 Stora Enso Oyj Substrat en papier ou en carton, procédé pour la production de substrat et emballage formé avec le substrat
WO2013188739A1 (fr) 2012-06-15 2013-12-19 University Of Maine System Board Of Trustees Papier couché antiadhésif et son procédé de fabrication
WO2016097964A1 (fr) 2014-12-18 2016-06-23 Stora Enso Oyj Procédé de production d'un substrat revêtu comprenant des fibres cellulosiques
JP2017000016A (ja) * 2015-06-04 2017-01-05 大王製紙株式会社 農業用シート及び積層シート
JP2019023360A (ja) * 2017-07-21 2019-02-14 大王製紙株式会社 製紙方法
US20200173109A1 (en) * 2017-05-18 2020-06-04 Stora Enso Oyj A method of manufacturing a film having low oxygen transmission rate valves
WO2022049484A1 (fr) 2020-09-01 2022-03-10 Stora Enso Oyj Procédé de production de papier satiné sur machine multicouche comprenant des fibres de cellulose hautement raffinées et papier satiné sur machine multicouche produit
WO2022189958A1 (fr) * 2021-03-10 2022-09-15 Stora Enso Oyj Procédé de fabrication d'un film barrière comprenant de la cellulose hautement raffinée

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001288692A (ja) * 2000-03-31 2001-10-19 Oji Paper Co Ltd 紙の製造方法
WO2011078770A1 (fr) 2009-12-21 2011-06-30 Stora Enso Oyj Substrat en papier ou en carton, procédé pour la production de substrat et emballage formé avec le substrat
EP2516156B1 (fr) 2009-12-21 2019-03-20 Stora Enso Oyj Substrat en papier ou en carton, procédé pour la production de substrat et emballage formé avec le substrat
EP2861800B1 (fr) 2012-06-15 2017-02-15 University of Maine System Board of Trustees Papier couché antiadhésif et son procédé de fabrication
WO2013188739A1 (fr) 2012-06-15 2013-12-19 University Of Maine System Board Of Trustees Papier couché antiadhésif et son procédé de fabrication
US20170342661A1 (en) * 2014-12-18 2017-11-30 Stora Enso Oyj Process for the production of a coated substance comprising cellulosic fibres
WO2016097964A1 (fr) 2014-12-18 2016-06-23 Stora Enso Oyj Procédé de production d'un substrat revêtu comprenant des fibres cellulosiques
EP3234260B1 (fr) 2014-12-18 2021-02-03 Stora Enso Oyj Procédé de production d'un substrat couché comprenant des fibres cellulosiques
JP2017000016A (ja) * 2015-06-04 2017-01-05 大王製紙株式会社 農業用シート及び積層シート
US20200173109A1 (en) * 2017-05-18 2020-06-04 Stora Enso Oyj A method of manufacturing a film having low oxygen transmission rate valves
JP2019023360A (ja) * 2017-07-21 2019-02-14 大王製紙株式会社 製紙方法
WO2022049484A1 (fr) 2020-09-01 2022-03-10 Stora Enso Oyj Procédé de production de papier satiné sur machine multicouche comprenant des fibres de cellulose hautement raffinées et papier satiné sur machine multicouche produit
WO2022189958A1 (fr) * 2021-03-10 2022-09-15 Stora Enso Oyj Procédé de fabrication d'un film barrière comprenant de la cellulose hautement raffinée

Also Published As

Publication number Publication date
WO2025061556A1 (fr) 2025-03-27

Similar Documents

Publication Publication Date Title
CN110832013B (zh) 制造具有低透氧率值的膜的方法
US12366035B2 (en) Multilayer film comprising MFC
JP7737396B2 (ja) 高度に精製されたセルロース繊維を含む多層フィルム
CN115413288B (zh) 包含高度精制的纤维素纤维的多层膜
BR112020020682A2 (pt) Método para a produção de um papel, papelão ou filme revestido e um papel, papelão ou filme revestido
JP2020502379A (ja) コート紙、板紙又はフィルムの製造方法及びコート紙、板紙又はフィルム
CN115427485A (zh) 包含高度精制的纤维素纤维的多层膜
US20230151553A1 (en) Multilayer film comprising highly refined cellulose fibers
US20240133118A1 (en) Method for manufacturing a barrier film comprising highly refined cellulose
US20220389658A1 (en) Mfc substrate with enhanced water vapour barrier
JP2024539547A (ja) マイクロフィブリル化セルロースを含むフィルムを製造する方法、及びマイクロフィブリル化セルロースを含むフィルム
EP4524323A1 (fr) Procédé de production d'un substrat en papier
WO2024100565A1 (fr) Film barrière pour matériau d'emballage
EP4615907A1 (fr) Film barrière multicouche, procédé de fabrication d'un tel film, et matériau d'emballage à base de papier ou de carton comprenant un tel film
CN115552075A (zh) 用于制造包含高度精制的纤维素纤维的膜的方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20250908