EP4158100A1 - Method for obtaining a fibrous preparation for immersion-resistant opaque paper - Google Patents

Method for obtaining a fibrous preparation for immersion-resistant opaque paper

Info

Publication number
EP4158100A1
EP4158100A1 EP21729484.2A EP21729484A EP4158100A1 EP 4158100 A1 EP4158100 A1 EP 4158100A1 EP 21729484 A EP21729484 A EP 21729484A EP 4158100 A1 EP4158100 A1 EP 4158100A1
Authority
EP
European Patent Office
Prior art keywords
salts
fatty acid
calcium
carbonate
acid salts
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
EP21729484.2A
Other languages
German (de)
French (fr)
Inventor
Erwan LE GOUE
Frédérique HAM-PICHAVANT
Véronique COMA
Stéphane GRELIER
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.)
Centre National de la Recherche Scientifique CNRS
PAPETERIE ZUBER RIEDER
Universite de Bordeaux
Institut Polytechnique de Bordeaux
Original Assignee
Centre National de la Recherche Scientifique CNRS
PAPETERIE ZUBER RIEDER
Universite de Bordeaux
Institut Polytechnique de Bordeaux
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 Centre National de la Recherche Scientifique CNRS, PAPETERIE ZUBER RIEDER, Universite de Bordeaux, Institut Polytechnique de Bordeaux filed Critical Centre National de la Recherche Scientifique CNRS
Publication of EP4158100A1 publication Critical patent/EP4158100A1/en
Pending legal-status Critical Current

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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents

Definitions

  • the present invention lies in the field of obtaining a fibrous preparation for the manufacture of a paper having a hydrophobicity and a significant opacity in the dry or wet state so as to be able to be affixed, for example, on a paper.
  • bottle of wines or spirits capable by its nature of being stored in a humid environment such as, for example, a refrigerator or an ice bucket.
  • the fibers are cellulose fibers.
  • the dosages of calcium salts and of carbonate salts used are advantageously determined to produce, by precipitation, a mass of calcium carbonate corresponding to at most 25% of the dry matter.
  • the fatty acid salts comprise 18 carbons in their chain and will preferably be potassium stearate.
  • the process for obtaining a fiber preparation comprises at least the following steps:
  • This last step can advantageously be followed by a step of adding to the fiber preparation obtained additives and / or dyes usually used in stationery.
  • Said additives and / or colorants which are well known to those skilled in the art, are such as, for example, alkyl ketene dimers (AKD), cationic starch, anionic pigment dyes, colloidal silica, or still some carboxymethylcellulose, in order to impart to the paper made from the fibrous preparation obtained an increased whiteness and opacity.
  • the carbonate salts in the form of an aqueous solution have counterions of a metallic nature such as, for example, counterions of sodium Na + , or of potassium K + .
  • the carbonate salts can also be of inorganic or organic nature such as, for example, dimethyl carbonate or ammonium carbonate.
  • the carbonate salts used are sodium carbonate.
  • the fatty acid salts comprise between 12 and 22 carbons in their chain and their counterions can be metallic (eg: Na + , K + ) or organic (eg: NH4 + ) salts.
  • the fatty acid salts will advantageously comprise 18 carbons in their chain and will preferably be potassium stearate.
  • the fibrous preparation obtained with the process according to the invention is then used, without additional treatment, on a conventional paper machine to manufacture a paper exhibiting significant hydrophobicity and opacity in the dry or wet state.
  • paper made from the resulting fiber preparation can subsequently be coated to further improve performance or provide other functionality.
  • the production process according to the invention is particularly advantageous, since it does not include a fiber washing step, it can be semi-continuous or continuous and implemented on one and the same production line, and the white water that it generates can be reused during the papermaking process from the fiber preparation obtained.
  • the opacity properties of the paper made from the fibrous preparation obtained by the production process according to the invention are also very good.
  • the dry opacity of the paper is high and after immersion in water, this opacity only decreases by almost 3% to remain stable even after 24 hours of immersion in water.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The present invention relates to a method for obtaining a fibrous preparation for manufacturing a paper having significant water repellency and opacity in the dry or wet state, characterised in that it comprises at least the following steps: - suspending fibres in water, - adding calcium salts to the fibres, - adding a source of carbonate salts in the form of an aqueous solution, - stirring the resulting mixture for a time sufficient to allow calcium carbonate particles to be precipitated, - adding a solution of fatty acid salts heated to a temperature which corresponds to the micellisation temperature of the fatty acid salts and takes into account the critical micellar concentration of the fatty acid salts, - stirring the mixture thus obtained for a time sufficient to allow the fatty acids to be absorbed at the surface of the calcium carbonate particles and to obtain the desired fibrous preparation.

Description

DESCRIPTION DESCRIPTION
TITRE : PROCEDE D'OBTENTION D'UNE PREPARATION FIBREUSE POUR PAPIER OPAQUE RESISTANT A L'IMMERSION TITLE: PROCESS FOR OBTAINING A FIBROUS PREPARATION FOR OPAQUE PAPER RESISTANT TO IMMERSION
Domaine technique de l'invention Technical field of the invention
La présente invention se situe dans le domaine de l'obtention d'une préparation fibreuse pour la fabrication d'un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide de manière à pouvoir être apposé, par exemple, sur une bouteille de vins ou spiritueux susceptible par sa nature d'être stockée en milieu humide tel que, par exemple, un réfrigérateur ou encore un seau à glace. The present invention lies in the field of obtaining a fibrous preparation for the manufacture of a paper having a hydrophobicity and a significant opacity in the dry or wet state so as to be able to be affixed, for example, on a paper. bottle of wines or spirits capable by its nature of being stored in a humid environment such as, for example, a refrigerator or an ice bucket.
Etat de la technique State of the art
Dans ce domaine technique particulier, on connaît déjà la demande de brevet français FR 3 071 517 déposée au nom de la Demanderesse et divulguant un papier opaque résistant à l'immersion pour la fabrication d'étiquette destinée principalement à des bouteilles de vins ou spiritueux, remarquable en ce qu'il est constitué d'un support papier de base non couché composé de fibres et de charges minérales opacifiantes, ledit support papier de base recevant sur ses faces recto et verso un traitement de surface constitué de pigments minéraux ou autres, associés à des liants hydrosolubles et synthétiques. In this particular technical field, French patent application FR 3,071,517 is already known, filed in the name of the Applicant and disclosing an opaque paper resistant to immersion for the manufacture of labels intended mainly for bottles of wines or spirits, remarkable in that it consists of an uncoated base paper support composed of fibers and opacifying mineral fillers, said base paper support receiving on its front and back sides a surface treatment consisting of inorganic or other pigments, associated to water-soluble and synthetic binders.
Ce papier pour étiquette, qui est certes intéressant car on obtient, avec les traitements de surface, des couches limitant la propagation de l'humidité vers le papier, présente toutefois un certain nombre d'inconvénients. This label paper, which is certainly interesting because, with the surface treatments, layers are obtained which limit the propagation of humidity towards the paper, however has a certain number of drawbacks.
En effet, les caractéristiques d'opacité et de résistance au milieu sec et humide de ce papier, qui ne sont obtenues que par des traitements de surface, sont donc limitées et ne permettent pas d'envisager pour ledit papier d'autres usages que celui des étiquettes de bouteilles de vins ou spiritueux, susceptibles par leur nature d'être stockées en milieu humide. In fact, the characteristics of opacity and resistance to dry and humid conditions of this paper, which are only obtained by surface treatments, are therefore limited and do not make it possible to envisage for said paper other uses than that. labels of bottles of wines or spirits, likely by their nature to be stored in a humid environment.
Résumé de l'invention Summary of the invention
Le but de la présente invention est donc de proposer un procédé d'obtention d'une préparation fibreuse pour fabriquer un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide de sorte à pouvoir utiliser ledit papier dans de nombreux usages, ladite préparation fibreuse présentant l'intérêt de pouvoir être fabriquée sur une seule et unique ligne de production. A cet égard, la présente invention a pour objet un procédé d'obtention d'une préparation fibreuse pour fabriquer un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide caractérisé en ce qu'elle comporte au moins les étapes suivantes :The aim of the present invention is therefore to provide a process for obtaining a fibrous preparation for manufacturing a paper exhibiting significant hydrophobicity and opacity in the dry or wet state so as to be able to use said paper in numerous uses, said fibrous preparation having the advantage of being able to be manufactured on a single and unique production line. In this regard, the present invention relates to a process for obtaining a fibrous preparation for manufacturing a paper exhibiting significant hydrophobicity and opacity in the dry or wet state, characterized in that it comprises at least the following steps :
- mise en suspension de fibres dans de l’eau,- suspending fibers in water,
- ajout de sels de calcium dans lesdites fibres,- addition of calcium salts in said fibers,
- ajout d’une source de sels de carbonates sous forme d’une solution aqueuse,- addition of a source of carbonate salts in the form of an aqueous solution,
- agitation du mélange obtenu pendant un temps suffisant pour permettre la précipitation de particules de carbonate de calcium,- stirring of the mixture obtained for a sufficient time to allow the precipitation of calcium carbonate particles,
- ajout d’une solution de sels d’acide gras chauffée à une température correspondant à la température de micellisation desdits sels d’acides gras et tenant compte de la concentration micellaire critique desdits sels d’acides gras,- addition of a solution of fatty acid salts heated to a temperature corresponding to the micellization temperature of said fatty acid salts and taking into account the critical micellar concentration of said fatty acid salts,
- agitation du mélange ainsi obtenu pendant un temps suffisant pour permettre l’adsorption des acides gras à la surface des particules de carbonate de calcium et obtenir la préparation fibreuse souhaitée. - stirring the mixture thus obtained for a time sufficient to allow the adsorption of fatty acids to the surface of the calcium carbonate particles and to obtain the desired fibrous preparation.
Selon un mode de réalisation avantageux, la dernière étape est suivie d'une étape d'ajout à la préparation fibreuse obtenue d'additifs et/ou de colorants habituellement utilisés en papeterie. According to an advantageous embodiment, the last step is followed by a step of adding to the fiber preparation obtained additives and / or dyes usually used in stationery.
Selon un mode de réalisation classique, les fibres sont des fibres de cellulose.According to a conventional embodiment, the fibers are cellulose fibers.
Selon un mode de réalisation avantageux, les sels de calcium possèdent soit des contre ions de nature minérale soit des contre ions de nature organique. According to an advantageous embodiment, the calcium salts have either counterions of mineral nature or against ions of organic nature.
Les sels de calcium sont de préférence du chlorure de calcium. The calcium salts are preferably calcium chloride.
Selon un mode de réalisation avantageux, les sels de carbonates possèdent des contre ions de nature métallique ou les sels de carbonates peuvent également être de nature minérale ou organique. According to an advantageous embodiment, the carbonate salts have counterions of metallic nature or the carbonate salts can also be of inorganic or organic nature.
Les sels de carbonates sont de préférence du carbonate de sodium. The carbonate salts are preferably sodium carbonate.
Selon un mode de réalisation avantageux, les dosages de sels de calcium et de sels de carbonates mises en œuvre sont avantageusement déterminées pour produire, par précipitation, une masse de carbonate de calcium correspondant à au plus 25% de la matière sèche. According to an advantageous embodiment, the dosages of calcium salts and of carbonate salts used are advantageously determined to produce, by precipitation, a mass of calcium carbonate corresponding to at most 25% of the dry matter.
De manière préférée, la masse de carbonate de calcium produite correspond à une valeur comprise entre 20 et 22% de la matière sèche. Selon un mode de réalisation avantageux, les sels d’acides gras comprennent entre 12 et 22 carbones dans leur chaîne et leurs contre ions peuvent être des sels métalliques ou organiques. Preferably, the mass of calcium carbonate produced corresponds to a value between 20 and 22% of the dry matter. According to an advantageous embodiment, the fatty acid salts comprise between 12 and 22 carbons in their chain and their counterions can be metallic or organic salts.
Selon un mode de réalisation encore plus avantageux, les sels d’acide gras comprennent 18 carbones dans leur chaîne et seront, à titre préférentiel, du stéarate de potassium. According to an even more advantageous embodiment, the fatty acid salts comprise 18 carbons in their chain and will preferably be potassium stearate.
Les sels d’acide gras sont de préférence du stéarate de potassium. The fatty acid salts are preferably potassium stearate.
L'invention concerne également un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide remarquable en ce qu'il est fabriqué à partir de la préparation fibreuse obtenue par le procédé d'obtention selon l'invention. Description des modes de réalisation The invention also relates to a paper exhibiting high hydrophobicity and opacity in the dry or wet state, which is remarkable in that it is made from the fibrous preparation obtained by the production process according to the invention. Description of the embodiments
Le procédé d'obtention selon l’invention d'une préparation fibreuse pour fabriquer un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide, s’appuie sur le principe de la précipitation de charges sur des fibres puis sur la modification desdites charges afin les rendre moins hydrophiles. The process for obtaining according to the invention a fibrous preparation for manufacturing a paper exhibiting significant hydrophobicity and opacity in the dry or wet state is based on the principle of the precipitation of charges on the fibers and then on the modification of said fillers to make them less hydrophilic.
Ainsi, le procédé d'obtention de préparation fibreuse comporte au moins les étapes suivantes : Thus, the process for obtaining a fiber preparation comprises at least the following steps:
- mise en suspension de fibres, classiquement des fibres de cellulose, dans de l’eau,- suspending fibers, conventionally cellulose fibers, in water,
- ajout de sels de calcium dans lesdites fibres,- addition of calcium salts in said fibers,
- ajout d’une source de sels de carbonates sous forme d’une solution aqueuse,- addition of a source of carbonate salts in the form of an aqueous solution,
- agitation du mélange obtenu pendant un temps suffisant pour permettre la précipitation de particules de carbonate de calcium,- stirring of the mixture obtained for a sufficient time to allow the precipitation of calcium carbonate particles,
- ajout d’une solution de sels d’acide gras chauffée à une température correspondant la température de micellisation desdits sels d’acides gras et tenant compte de la concentration micellaire critique (CMC) desdits sels d’acides gras,- addition of a solution of fatty acid salts heated to a temperature corresponding to the micellization temperature of said fatty acid salts and taking into account the critical micellar concentration (CMC) of said fatty acid salts,
- agitation du mélange ainsi obtenu pendant un temps suffisant pour permettre l’adsorption des acides gras à la surface des particules de carbonate de calcium et obtenir la préparation fibreuse souhaitée. - stirring the mixture thus obtained for a time sufficient to allow the adsorption of fatty acids to the surface of the calcium carbonate particles and to obtain the desired fibrous preparation.
Cette dernière étape peut avantageusement être suivie d'une étape d'ajout à la préparation fibreuse obtenue d'additifs et/ou de colorants habituellement utilisés en papeterie. Lesdits additifs et/ou colorants, qui sont bien connus de l'Homme du Métier, sont tels que, par exemple, des alkyle cétène dimères (AKD), de l'amidon cationique, des colorants pigmentaires anioniques, de la silice colloïdale, ou encore de la carboxyméthylcellulose, afin de conférer au papier fabriqué à partir de la préparation fibreuse obtenue une blancheur et une opacité accrues. This last step can advantageously be followed by a step of adding to the fiber preparation obtained additives and / or dyes usually used in stationery. Said additives and / or colorants, which are well known to those skilled in the art, are such as, for example, alkyl ketene dimers (AKD), cationic starch, anionic pigment dyes, colloidal silica, or still some carboxymethylcellulose, in order to impart to the paper made from the fibrous preparation obtained an increased whiteness and opacity.
Selon un mode de réalisation avantageux, les sels de calcium possèdent soit des contre ions de nature minérale tels que, par exemple, des contre ions de nitrate NO3 , de chlorure Cl , d'iodure G, ou encore de bromure Br , soit des contre ions de nature organique et pouvant être, par exemple, sous la forme de carboxylates de calcium possédant un à plusieurs carbones tels que, par exemple, de l'acétate de calcium. Toutefois, à titre préférentiel, les sels de calcium utilisés sont du chlorure de calcium.According to an advantageous embodiment, the calcium salts have either counterions of mineral nature such as, for example, counterions of nitrate NO3, of chloride Cl, of iodide G, or of bromide, or of counterions. ions of organic nature and which may be, for example, in the form of calcium carboxylates having one to more carbons such as, for example, calcium acetate. However, preferably, the calcium salts used are calcium chloride.
De même, les sels de carbonates sous forme de solution aqueuse possèdent des contre ions de nature métallique tels que, par exemple, des contre ions de sodium Na+, ou de potassium K+. Par ailleurs, les sels de carbonates peuvent également être de nature minérale ou organique tels que, par exemple, du carbonate de diméthyle ou du carbonate d'ammonium. Toutefois, à titre préférentiel, les sels de carbonates utilisés sont du carbonate de sodium. Likewise, the carbonate salts in the form of an aqueous solution have counterions of a metallic nature such as, for example, counterions of sodium Na + , or of potassium K + . Moreover, the carbonate salts can also be of inorganic or organic nature such as, for example, dimethyl carbonate or ammonium carbonate. However, preferably, the carbonate salts used are sodium carbonate.
Par ailleurs, les dosages de sels de calcium et de sels de carbonates mises en œuvre sont avantageusement déterminées pour produire, par précipitation, une masse de carbonate de calcium correspondant à au plus 25% de la matière sèche et, de préférence, à une valeur comprise entre 20 et 22%. Furthermore, the dosages of calcium salts and carbonate salts used are advantageously determined to produce, by precipitation, a mass of calcium carbonate corresponding to at most 25% of the dry matter and, preferably, to a value between 20 and 22%.
De plus, le fait d'intégrer cette phase de précipitation du carbonate de calcium dans le procédé général de fabrication de préparation fibreuse conforme à l'invention permet de garantir, lors de l'agitation du mélange obtenu, la fixation des particules de carbonate de calcium directement à la surface et/ou dans les fibres, afin d'accroître les caractéristiques de la préparation fibreuse obtenue. Avec le procédé de fabrication de préparation fibreuse conforme à l'invention, on a pu constater que les particules de carbonate de calcium sont, en outre, unitaires, non agglomérées et de dimensions régulières comprises entre 0,2 et 5 pm. In addition, the fact of integrating this phase of precipitation of calcium carbonate in the general process for the manufacture of fibrous preparation in accordance with the invention makes it possible to guarantee, during the stirring of the mixture obtained, the fixation of the carbonate particles. calcium directly on the surface and / or in the fibers, in order to increase the characteristics of the fibrous preparation obtained. With the process for manufacturing a fiber preparation according to the invention, it has been found that the particles of calcium carbonate are, in addition, unitary, not agglomerated and of regular dimensions of between 0.2 and 5 μm.
Selon ce mode de réalisation avantageux, les sels d’acides gras comprennent entre 12 et 22 carbones dans leur chaîne et leurs contre ions peuvent être des sels métalliques (ex : Na+, K+) ou organiques (ex : NH4+). Les sels d’acide gras comprendront avantageusement 18 carbones dans leur chaîne et seront, à titre préférentiel, du stéarate de potassium. According to this advantageous embodiment, the fatty acid salts comprise between 12 and 22 carbons in their chain and their counterions can be metallic (eg: Na + , K + ) or organic (eg: NH4 + ) salts. The fatty acid salts will advantageously comprise 18 carbons in their chain and will preferably be potassium stearate.
L'adsorption des acides gras à la surface des particules de carbonate de calcium permet de rendre ces dernières moins hydrophiles et donc d'accroître significativement la caractéristique hydrophobe des fibres, de la préparation fibreuse obtenue et du papier fabriqué à partir de ladite préparation fibreuse. The adsorption of fatty acids at the surface of the calcium carbonate particles makes it possible to make the latter less hydrophilic and therefore significantly increase the hydrophobic characteristic of the fibers, of the fibrous preparation obtained and of the paper made from said fibrous preparation.
Le procédé d'obtention conforme à l'invention pourra comporter, si nécessaire, une étape d'ajout de charges The method of obtaining in accordance with the invention may include, if necessary, a step of adding fillers.
La préparation fibreuse obtenue avec le procédé selon l'invention est ensuite utilisée, sans traitement supplémentaire, sur machine à papier classique pour fabriquer un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide. Toutefois, le papier fabriqué à partir de la préparation fibreuse obtenue peut être par la suite enduit pour améliorer encore ses performances ou lui apporter d’autres fonctionnalités. The fibrous preparation obtained with the process according to the invention is then used, without additional treatment, on a conventional paper machine to manufacture a paper exhibiting significant hydrophobicity and opacity in the dry or wet state. However, paper made from the resulting fiber preparation can subsequently be coated to further improve performance or provide other functionality.
Par ailleurs, le procédé d'obtention selon l'invention est particulièrement avantageux, car il ne comporte pas d'étape de lavage des fibres, il peut être semi- continu ou continu et mis en œuvre sur une seul est même ligne de production, et les eaux blanches qu'il génère peuvent être réutilisées au cours du processus de fabrication de papier à partir de la préparation fibreuse obtenue. Furthermore, the production process according to the invention is particularly advantageous, since it does not include a fiber washing step, it can be semi-continuous or continuous and implemented on one and the same production line, and the white water that it generates can be reused during the papermaking process from the fiber preparation obtained.
Enfin, on comprend bien que, le procédé d'obtention selon l'invention permet d'agir directement dans la masse de fibres de la préparation fibreuse afin d'obtenir une préparation fibreuse spécifique et non uniquement sur la surface d'un papier de l'art antérieur fabriqué à partir d'une préparation fibreuse classique, ce qui confère au papier fabriqué à partir de ladite préparation fibreuse spécifique une hydrophobie et une opacité à l’état sec ou humide plus importantes et intéressantes que celles du papier de l'art antérieur. En effet, on comprend bien que l'un des caractéristiques innovantes du procédé d'obtention selon l'invention repose sur le fait d'avoir une étape d'ajout d'une solution de sels d'acides gras, après précipitation de la charge, ladite solution de sels d'acides gras utilisée étant chauffée à leur température de micellisation desdits sels d’acides gras. Cette étape permet l'adsorption des micelles d'acides gras créées (avec la température de micellisation) avec le carbonate de calcium précipité sur la fibre, ce qui a pour effet, au final, de rendre les fibres moins hydrophiles. Finally, it will be understood that the production process according to the invention makes it possible to act directly in the mass of fibers of the fibrous preparation in order to obtain a specific fibrous preparation and not only on the surface of a paper of the 'prior art made from a conventional fiber preparation, which gives the paper made from said specific fiber preparation a hydrophobicity and opacity in the dry or wet state more important and interesting than those of the paper of the art prior. Indeed, it is well understood that one of the innovative characteristics of the production process according to the invention is based on having a step of adding a solution of fatty acid salts, after precipitation of the charge. , said solution of fatty acid salts used being heated to their micellization temperature of said fatty acid salts. This step allows the adsorption of the fatty acid micelles created (with the micellization temperature) with the calcium carbonate precipitated on the fiber, which ultimately has the effect of making the fibers less hydrophilic.
Ainsi, des essais selon la méthode du Cobb ont montré que le procédé d'obtention de préparation fibreuse selon l'invention confère au papier fabriqué à partir de cette préparation fibreuse une faible absorption d’eau sur des temps longs. En effet, la quantité d'eau absorbée par ledit papier après une immersion d'une heure n’augmente que de 30 % au bout de 24 h d'immersion, prouvant ainsi la stabilisation dans le temps de ses propriétés de résistance à l’eau. Par ailleurs, on comprend bien qu'avec une absorption d’eau plus faible, ledit papier présente une moindre déformation et une plus grande stabilité dimensionnelle. Thus, tests according to the Cobb method have shown that the process for obtaining a fibrous preparation according to the invention confers on the paper made from this fibrous preparation low water absorption over long periods of time. Indeed, the quantity of water absorbed by said paper after an immersion of one hour only increases by 30% after 24 h of immersion, thus proving the stabilization over time. of its water resistance properties. Furthermore, it is understood that with a lower water absorption, said paper exhibits less deformation and greater dimensional stability.
Par ailleurs, les propriétés d’opacité du papier fabriqué à partir de la préparation fibreuse obtenue par le procédé d'obtention selon l'invention sont également très bonnes. L’opacité sèche du papier est élevée et après immersion dans l’eau, cette opacité décroît seulement de près de 3% pour rester stable même au bout de 24 h d’immersion dans l’eau. Furthermore, the opacity properties of the paper made from the fibrous preparation obtained by the production process according to the invention are also very good. The dry opacity of the paper is high and after immersion in water, this opacity only decreases by almost 3% to remain stable even after 24 hours of immersion in water.
On comprend bien que le procédé d'obtention selon l'invention est avantageusement destiné à produire une préparation fibreuse pour la fabrication d'un papier pour étiquette de bouteille de vins ou spiritueux. Toutefois, il va de soi que, compte tenu des caractéristiques élevées d'hydrophobie et d'opacité conféré au papier fabriqué à partir de la préparation fibreuse obtenue par le procédé d'obtention selon l'invention, ledit papier pourra être destiné à de nombreux autres usages tels que, par exemple, la fabrication de packaging alimentaire ou non. It is well understood that the production process according to the invention is advantageously intended to produce a fibrous preparation for the manufacture of paper for bottle labels for wines or spirits. However, it goes without saying that, taking into account the high characteristics of hydrophobicity and opacity conferred on the paper produced from the fibrous preparation obtained by the production process according to the invention, said paper may be intended for many other uses such as, for example, the manufacture of food packaging or not.
Enfin, il va de soi que les exemples de procédés d'obtention de préparation fibreuse conformes à l'invention qui viennent d'être décrits ne sont que des illustrations particulières, en aucun cas limitatives de l'invention. Finally, it goes without saying that the examples of processes for obtaining a fibrous preparation in accordance with the invention which have just been described are only specific illustrations, in no way limiting the invention.

Claims

REVENDICATIONS
1. Procédé d'obtention d'une préparation fibreuse pour fabriquer un papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide caractérisé en ce qu'il comporte au moins les étapes suivantes :1. Process for obtaining a fibrous preparation for making a paper exhibiting significant hydrophobicity and opacity in the dry or wet state, characterized in that it comprises at least the following steps:
- mise en suspension de fibres dans de l’eau,- suspending fibers in water,
- ajout de sels de calcium dans lesdites fibres,- addition of calcium salts in said fibers,
- ajout d’une source de sels de carbonates sous forme d’une solution aqueuse,- addition of a source of carbonate salts in the form of an aqueous solution,
- agitation du mélange obtenu pendant un temps suffisant pour permettre la précipitation de particules de carbonate de calcium,- stirring of the mixture obtained for a sufficient time to allow the precipitation of calcium carbonate particles,
- ajout d’une solution de sels d’acide gras chauffée à une température correspondant à la température de micellisation desdits sels d’acides gras et tenant compte de la concentration micellaire critique desdits sels d’acides gras,- addition of a solution of fatty acid salts heated to a temperature corresponding to the micellization temperature of said fatty acid salts and taking into account the critical micellar concentration of said fatty acid salts,
- agitation du mélange ainsi obtenu pendant un temps suffisant pour permettre l’adsorption des acides gras à la surface des particules de carbonate de calcium et obtenir la préparation fibreuse souhaitée.. - stirring the mixture thus obtained for a time sufficient to allow the adsorption of fatty acids to the surface of the calcium carbonate particles and to obtain the desired fibrous preparation.
2. Procédé d'obtention selon la revendication 1 caractérisé en ce que la dernière étape est suivie d'une étape d'ajout à la préparation fibreuse obtenue d'additifs et/ou de colorants habituellement utilisés en papeterie. 2. A method of obtaining according to claim 1 characterized in that the last step is followed by a step of adding to the fibrous preparation obtained additives and / or dyes usually used in stationery.
3. Procédé d'obtention selon l'une quelconque des revendications 1 ou 2 caractérisé en ce que les fibres sont des fibres de cellulose. 3. A method of obtaining according to any one of claims 1 or 2 characterized in that the fibers are cellulose fibers.
4. Procédé d'obtention selon l'une quelconque des revendications 1 à 3 caractérisé en ce que les sels de calcium possèdent soit des contre ions de nature minérale soit des contre ions de nature organique. 4. Process for obtaining according to any one of claims 1 to 3, characterized in that the calcium salts have either counterions of mineral nature or against ions of organic nature.
5. Procédé d'obtention selon la revendication 4 caractérisé en ce que les sels de calcium sont du chlorure de calcium. 5. Process for obtaining according to claim 4 characterized in that the calcium salts are calcium chloride.
6. Procédé d'obtention selon l'une quelconque des revendications 1 à 5 caractérisée en ce que les sels de carbonates possèdent des contre ions de nature métallique ou les sels de carbonates peuvent également être de nature minérale ou organique. 6. Process for obtaining according to any one of claims 1 to 5, characterized in that the carbonate salts have counterions of a metallic nature or the carbonate salts can also be of inorganic or organic nature.
7. Procédé d'obtention selon la revendication 6 caractérisé en ce que les sels de carbonates sont du carbonate de sodium. 7. A method of obtaining according to claim 6 characterized in that the carbonate salts are sodium carbonate.
8. Procédé d'obtention selon l'une quelconque des revendications 1 à 7 caractérisé en ce que les dosages de sels de calcium et de sels de carbonates mises en œuvre sont avantageusement déterminées pour produire, par précipitation, une masse de carbonate de calcium correspondant à au plus 25% de la matière sèche. 8. A method of obtaining according to any one of claims 1 to 7 characterized in that the dosages of calcium salts and carbonate salts used are advantageously determined to produce, by precipitation, a mass of corresponding calcium carbonate. at most 25% of the dry matter.
9. Procédé d'obtention selon la revendication 8 caractérisé en ce que la masse de carbonate de calcium produite correspond à une valeur comprise entre 20 et 22% de la matière sèche. 9. A method of obtaining according to claim 8 characterized in that the mass of calcium carbonate produced corresponds to a value between 20 and 22% of the dry matter.
10. Procédé d'obtention selon l'une quelconque des revendications 1 à 9 caractérisé en ce que les sels d’acides gras comprennent entre 12 et 22 carbones dans leur chaîne et leurs contre ions peuvent être des sels métalliques ou organiques. 10. The production process according to any one of claims 1 to 9 characterized in that the fatty acid salts comprise between 12 and 22 carbons in their chain and their counterions can be metallic or organic salts.
11. Procédé d'obtention selon la revendication 10 caractérisé en ce que les sels d’acide gras comprennent 18 carbones dans leur chaîne et seront, à titre préférentiel, du stéarate de potassium. 11. The production process according to claim 10, characterized in that the fatty acid salts comprise 18 carbons in their chain and will preferably be potassium stearate.
12. Procédé d'obtention selon la revendication 11 caractérisé en ce que les sels d’acide gras sont du stéarate de potassium. 12. The production process according to claim 11 characterized in that the fatty acid salts are potassium stearate.
13. Papier présentant une hydrophobie et une opacité importantes à l’état sec ou humide caractérisé en ce qu'il est fabriqué à partir de la préparation fibreuse obtenue par le procédé d'obtention selon l'une quelconque des revendications 1 à 12. 13. Paper exhibiting significant hydrophobicity and opacity in the dry or wet state, characterized in that it is made from the fibrous preparation obtained by the production process according to any one of claims 1 to 12.
EP21729484.2A 2020-05-28 2021-05-27 Method for obtaining a fibrous preparation for immersion-resistant opaque paper Pending EP4158100A1 (en)

Applications Claiming Priority (2)

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FR2005654A FR3110919B1 (en) 2020-05-28 2020-05-28 METHOD FOR OBTAINING A FIBROUS PREPARATION FOR IMMERSION-RESISTANT OPAQUE PAPER
PCT/EP2021/064218 WO2021239882A1 (en) 2020-05-28 2021-05-27 Method for obtaining a fibrous preparation for immersion-resistant opaque paper

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EP (1) EP4158100A1 (en)
AU (1) AU2021278296A1 (en)
FR (1) FR3110919B1 (en)
WO (1) WO2021239882A1 (en)
ZA (1) ZA202212178B (en)

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US5275699A (en) * 1992-10-07 1994-01-04 University Of Washington Compositions and methods for filling dried cellulosic fibers with an inorganic filler
EP3012223A1 (en) * 2014-10-24 2016-04-27 Omya International AG PCC with reduced portlandite content
FR3071517B1 (en) 2017-09-22 2021-12-24 Papeterie Zuber Rieder IMMERSION RESISTANT OPAQUE PAPER

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FR3110919B1 (en) 2022-06-24
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FR3110919A1 (en) 2021-12-03
AU2021278296A1 (en) 2022-12-01
WO2021239882A1 (en) 2021-12-02

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