EP2504487B1 - Verfahren zur herstellung einer nanofibrillierten zellulosepulpe und verwendung der pulpe bei der papierherstellung in nanofibrillierten zellulose-verbundstoffen - Google Patents

Verfahren zur herstellung einer nanofibrillierten zellulosepulpe und verwendung der pulpe bei der papierherstellung in nanofibrillierten zellulose-verbundstoffen Download PDF

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EP2504487B1
EP2504487B1 EP10832694.3A EP10832694A EP2504487B1 EP 2504487 B1 EP2504487 B1 EP 2504487B1 EP 10832694 A EP10832694 A EP 10832694A EP 2504487 B1 EP2504487 B1 EP 2504487B1
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Prior art keywords
pulp
cellulose
optical brightening
brightening agent
refining
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English (en)
French (fr)
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EP2504487A1 (de
EP2504487A4 (de
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Markus Nuopponen
Taru PÄIVÄLÄINEN
Antti Laukkanen
Jouni Paltakari
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UPM Kymmene Oy
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UPM Kymmene Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • 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
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • 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
    • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
    • 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
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • 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
    • D21H21/32—Bleaching agents

Definitions

  • the invention relates to a method of manufacturing nanofibrillated cellulose pulp.
  • the invention further relates to use of the pulp in paper manufacturing or in nanofibrillated cellulose composites.
  • nanofibrillated cellulose consumes a great deal of energy due to several fibrillarion passages that are needed to achieve nano-sized material. Because the energy consumption of the manufactured pulp increases hugely when the produced pulp includes nanofibrillated cellulose, there may be an efficiency problem when the produced pulp consist at least partly of nanofibrillated cellulose. Sometimes another problem in the nanofibrillated cellulose pulp production is poor water removal due to several strong bonds between cellulose fibers and the water to be removed.
  • the new additive would preferably have features to reduce the inter-fiber bonding and, thus, increase a refining efficiency due to decreased energy consumption of the refining stage.
  • the additive would preferably have features to reduce fiber-water and fiber-fiber bonding that occurs during drying and concentrating.
  • the additive would preferably be some of those additives that are often added for another purpose on later process stages.
  • the present invention solves at least some of the above mentioned problems by providing a method for pulp manufacturing wherein the produced pulp consist at least partly of nanofibrillated cellulose.
  • the method comprises a step in which at least one type of optical brightening agent (OBA) is dosed before and/or during at least one pre-refining and/or fibrillation stage.
  • OSA optical brightening agent
  • the invention further discloses a use of the produced pulp in nanofibrillated cellulose composites or in paper or paperboard manufacturing including base paper manufacturing and finishing stages like, for example, the use in paper or paperboard coatings.
  • optical brightening agents can increase the production efficiency of the nanofibrillated cellulose pulp if the additives are dosed before or during a pre-refining stage and/or a fibrillation stage.
  • Optical brightening agents have been found to be able to create bonding with cellulose in such a way that the optical brightening agents can act as substituents in inter-fiber bonding and, thus, inhibiting hydrogen bonding of fibrils in cellulose.
  • the increased production efficiency is mainly due to decreased energy consumption of the fibrillation stage because of the substituent effect.
  • Optical brightening agents are also able to create bonding with water and, thus, to increase the efficiency of drying and concentrating processes.
  • optical brightening agents are able to enable redispersing of nanofibrillated containing cellulose. Due to the dispersive effect, an optical brightening agent can be used as a dispersing agent in nanofibrillated concentrating and/or redispersing process and, therefore, help the process. In addition, due to the dispersive effect, the quality of the nanofibrillated cellulose pulp can be increased.
  • At least one kind of optical brightening agent is added before a pulp pre-refining stage. According to another embodiment, at least one kind of optical brightening agent is added before a pulp fibrillation stage. According to another embodiment, at least one kind of optical brightening agent is dosed into the pulp at the pre-refining stage. According to another embodiment, at least one kind of optical brightening agent is dosed into the pulp at the fibrillation stage.
  • the amount of the nanofibrillated cellulose in the produced pulp is more than 30 w-%, preferably more than 40 w-%, 50 w-%, 60 w-% or 70 w-%, and can be even up to 100 w-% measured from the dried pulp.
  • the nanofibrillated cellulose pulp that can be produced according to the invention and, thus, contains one or more optical brightening agents, may be used in various end product applications.
  • the cellulose pulp may be used, for example, in nanofibrillated cellulose composites, and/or in paper manufacturing, for example, in a base paper and/or in a finishing stage of produced paper.
  • the finishing stages of produced paper includes, for example, coating stages.
  • cellulose raw material refers to any cellulose raw material source that can be used in a production of cellulose pulp, refined pulp, or microfibrillar cellulose.
  • the cellulose raw material can be based on any plant material that contains cellulose, for example wood material.
  • the wood material can be from softwood trees, such as spruce, pine, fir, larch, douglas-fir or hemlock, or from hardwood trees, such as birch, aspen, poplar, alder, eucalyptus or acacia, or from a mixture of softwoods and hardwoods.
  • Non-wood material can be from agricultural residues, grasses or other plant substances such as straw, leaves, bark, seeds, hulls, flowers, vegetables or fruits from cotton, corn, wheat, oat, rye, barley, rice, flax, hemp, manila hemp, sisal hemp, jute, ramie, kenaf, bagasse, bamboo or reed.
  • agricultural residues, grasses or other plant substances such as straw, leaves, bark, seeds, hulls, flowers, vegetables or fruits from cotton, corn, wheat, oat, rye, barley, rice, flax, hemp, manila hemp, sisal hemp, jute, ramie, kenaf, bagasse, bamboo or reed.
  • cellulose pulp refers in this application to cellulose fibers, which are isolated from any cellulose raw material using chemical, mechanical, thermomechanical, or chemithermo - mechanical pulping process(es). Typically the diameter of the fibers varies between 15-25 ⁇ m and the length exceeds 500 ⁇ m, but the present invention is not intended to be limited to these parameters.
  • paper manufacturing refers to manufacturing process of any paper-like material, for example, paperboards, papers and/or paper composites.
  • At least part of the lignin that has been included in cellulose raw material is advantageously removed from the cellulose raw material when it is processed into cellulose pulp to be used in the nanofibrillated cellulose production.
  • chemical pulp may be used more preferably for nanofibrillated cellulose production than mechanical pulp.
  • the yield of the process wherein cellulose raw material is processed into cellulose pulp to be used in the nanofibrillated pulp production has been at least 50 %, at least 60 %, at least 70 % or at least 80 %.
  • the cellulose pulp used in the nanofibrillated cellulose production may be preferably unbleached or bleached chemithermo or chemical pulp, more preferably unbleached or bleached chemical pulp, and the most preferably unbleached chemical pulp, because the method of the invention may be the most advantageous compared to other processes when the used cellulose pulp is chemically produced unbleached pulp.
  • refined pulp refers to refined cellulose pulp.
  • the refining of cellulose pulp is carried out with suitable equipment such as a refiner, grinder, homogenizer, colloider, friction grinder, fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer or ultrasound sonicator.
  • suitable equipment such as a refiner, grinder, homogenizer, colloider, friction grinder, fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer or ultrasound sonicator.
  • suitable equipment such as a refiner, grinder, homogenizer, colloider, friction grinder, fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer or ultrasound sonicator.
  • fluidizer such as microfluidizer, macrofluidizer or fluidizer-type homogenizer or ultrasound sonicator.
  • all cellulose fibers have not been fully fibrillated; a large fraction of cellulose fibers with unchanged dimensions are still present in addition to refined cellulose material.
  • nanofibrillated cellulose refers to a collection of isolated cellulose microfibrils or microfibril bundles derived from cellulose raw material.
  • Microfibrils have typically high aspect ratio: the length might exceed one micrometer while the number-average diameter is typically below 200 nm.
  • the diameter of microfibril bundles can also be larger but generally less than 1 ⁇ m.
  • the smallest microfibrils are similar to the so called elementary fibrils, which are typically 2-12 nm in diameter.
  • the dimensions of the fibrils or fibril bundles are dependent on the raw material and disintegration method.
  • the nanofibrillated cellulose may also contain some hemicelluloses; the amount may be dependent on the plant source.
  • Nanofibrillated cellulose can also be any chemically or physically modified derivate of cellulose microfibrils or microfibril bundles.
  • the chemical modification could be based for example on carboxymethylation, oxidation, esterification, or etherification reaction of cellulose molecules. Modification could also be realized by physical adsorption of anionic, cationic, or non-ionic substances or any combination of these on cellulose surface.
  • the described modification can be carried out before, after, or during the production of nanofibrillated cellulose.
  • Nanofibrillated cellulose described in this application is not the same material as the so called cellulose whiskers, which are also known as: cellulose nanowhiskers, cellulose nanocrystals, cellulose nanorods, rod-like cellulose microcrystals or cellulose nanowires. In some cases, similar terminology is used for both materials, for example by Kuthcarlapati et al.
  • cellulose nanofiber amorphous segment along the fibrillar structure as microfibrillar cellulose, which leads to more rigid structure.
  • Cellulose whiskers are also shorter than microfibrillar cellulose; typically the length is less than one micrometer.
  • Nanofibrillated cellulose and normal cellulose are usually produced using different kind of refiners, because the refiners that are used conventionally in the pulp refiner production may not, at least efficiently, be used in nanofibrillated cellulose production. However, the refiners used in the conventional pulp production may be used as pre-refiners in nanofibrillated cellulose production.
  • the term “fibrillation stage” means the stage that causes more fibrillar cellulose
  • the term “pre-refiner stage” means the stage that may advantageously be used for pre-refining before a fibrillation stage in nanofibrillated cellulose production.
  • Nanofibrillated cellulose pulp differs hugely from conventional cellulose pulp due to many nano-sized particles of the nanofibrillated cellulose pulp and, thus, nanofibrillated cellulose cannot be though as a same material as conventional cellulose pulp.
  • Nanofibrillated cellulose is, for example, gel-like material even in low consistency, and its water removal rate is usually slow.
  • Paper sheets that contain a lot of nanofibrillated cellulose have special properties comparing to the sheets made from normal cellulose pulp, for example, they have usually high strength properties, their porosity is very low, and the sheets are usually (at least partly) transparent.
  • FIGS. 1 a-1 d The differences between cellulose pulp, refined cellulose pulp and nanofibrillated cellulose pulp are illustrated in figures 1 a-1 d in optical microscopy pictures. Magnification is the same in the figures 1a - 1 c.
  • Figure 1 a shows an optical microscopy picture of typical cellulose pulp.
  • Figure 1 b shows an microscopy picture of typical refined cellulose pulp.
  • Figures 1 c and 1 d show microscopy pictures of typical nanofibrillated cellulose pulp.
  • the large cellulose fibers shown in figures 1 a and 1 b are not anymore clearly visible.
  • Figure 1 d shows the same situation as figure 1 c but with higher magnification wherein individual microfibrils and microfibril bundles with diameter less than 100 nm can be detected.
  • the present invention provides a method for manufacturing nanofibrillated cellulose pulp by pre-refining and/or fibrillating the pulp with a presence of at least one kind of optical brightening agent.
  • the present invention provides the use of the produced pulp in paper manufacturing or in nanofibrillated cellulose composites.
  • optical brightening agents are dye-like compounds which absorb short-wave light in the ultraviolet and violet region of the electromagnetic spectrum not visible to the human eye and re-emit the light in the longer-wave blue region.
  • optical brightening agents make the material, for example paper, to look less yellow to the human eyes and, thus, human eyes interpret the blue light as a higher degree of whiteness.
  • the optical brightening agents are used to achieve better optical properties of the produced paper, for example, for a whitening effect of the produced paper.
  • Optical brightening agent types that are typically used in the pulp and paper industry are, for example, di-, tetra-, and hexasulphonated stilbene compounds.
  • the amount of sulphonated groups has an effect on the chemical properties of the optical brightening agent and, thus, the type of the used OBA may have an effect on the method according to an example embodiment of the invention.
  • the more the optical brightening agent has sulphonated groups the bigger may be the effect of the used optical brightening agent on the method accordant with the invention.
  • Some other most commercially available optical brightening agents in pulp and paper industries are based on coumarin and pyrazoline chemistries. Those mentioned optical brightening agent types are only some examples and also other types of optical brightening agents known in prior art can be used in this invention.
  • those chemical types mentioned in the application i.e stilbene, coumarin and pyrazoline, are preferred to use in the practice of this invention.
  • the anionic stilbene compounds may be the most preferably used in the invention.
  • optical brightening agents are quite expensive additives, thus, solutions provided in this invention are intended to be the most efficient if optical brightening agents are used in nanofibrillated pulp production wherein the optical brightening agent is otherwise added in a later stage to the pulp or to the end product.
  • optical brightening agents are typically added at the wet end of the papermaking process, which include, for example, the fan pulp or the machine chest.
  • optical brightening agent in accordance with some example embodiments of the invention does not necessarily increase additive costs but, quite the contrary, the retention of the optical brightening agent to the nanofibrillated pulp may be improved if the optical brightening agent is added before or during pre-refining stage or before or during a fibrillation step and, therefore, the overall costs of the used optical brightening agent may be decreased.
  • the total amount of the needed optical brightening agent dosage according to an example embodiment of the invention can be smaller if the optical brightening agent is added accordant with some example embodiments of the invention due to several fiber - optical brightening agent bondings that may be formed during nanofibrillated cellulose pre-refining and/or fibrillation stages.
  • the efficiency of the nanofibrillated cellulose production can further be increased when the optical brightening agent is added to the produced pulp before or during the refining stage, not only because of the decreased energy consumption but also because of less additive costs.
  • the optical brightening agent dosage to the nanofibrillated cellulose production according to some example embodiments of this invention may increase an ability of the nanofibrillated cellulose to carry the optical brightening agent and, therefore, a need for other optical brightening agent carriers e.g. Polyvinyl Alcohol (PVOH) may decrease.
  • PVOH Polyvinyl Alcohol
  • the method comprises a step wherein at least one type of the optical brightening agent (OBA) is dosed as a refining additive to the pulp which contains cellulose.
  • OSA optical brightening agent
  • the dosage is preferably done before a pre-refining and/or fibrillation stage.
  • one type of the optical brightening agent can be added into the pulp at the pre-refining or the fibrillation stage.
  • the pulp is fibrillated in at least one fibrillation stage after the additive addition, no matter in which stage the additive is added to the process.
  • the anionic optical brightening agent is capable of inhibiting hydrogen bonding between the cellulose fibrils in cellulose and can therefore be used to create a dispersive effect, which dispersive effect can increase the quality of the produced nanofibrillated cellulose. Due to the dispersive effect, optical brightening agent can be used as a dispersing agent in the nanofibrillated concentrating/redispersing process and, therefore, may help the process.
  • Nanofibrillated cellulose that contains optical brightening agent may improve not only the refining efficiency and the quality of the produced pulp but also both the strength and the optical properties of the end product to be produced from the pulp manufactured according to an example embodiment of the invention.
  • the improvements in strength properties are mainly due to the features of nanofibrillated cellulose and the improvements in optical properties are mainly due to the features of the optical brightening agent.
  • the novel invention can provide at least some of the following advantages:
  • the amount of nanofibrillated cellulose in the pulp manufactured according to the invention may be 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95 or 100 w- %, including any and all ranges and subranges therein.
  • the pulp manufacturing process according to invention has at least one fibrillation stage, possibly at least 2, 3 or 4 fibrillation stages. According to the invention at least one type of the optical brightening agent is added
  • the pulp is fibrillated after at least one additive dosage in at least one fibrillation stage in order to form some nanofibrillated cellulose material.
  • the addition of the optical brightening agent before or during the refining decreases the cellulose-cellulose bonding through hydroxyl groups by forming hydrogen bonds with the cellulose fibrils.
  • the addition of the optical brightening agent creates a dispersive effect to the pulp suspension through the repulsive forces between the anionic groups.
  • a bleached birch pulp made with conventional chemical pulping process was used as raw cellulose pulp.
  • optical brightening agents Two different kinds of optical brightening agents were used as the refining additive: disulphonic type of the optical brightening agent and hexasulphonic type of the optical brightening agent. In addition, reference samples without addition of the optical brightening agent were performed.
  • the pre-refining stage was performed with Voith refiner. Addition of the used optical brightening agent was always 2 w-%. The whole amount was dosed to the pulp before the pre-refiner stage, after which the samples were refined at energy of 200 kWh/t. The pre-refinings were performed in the consistency of 4%.
  • the obtained pulps were diluted to 1.6% for fluidizer and to 2% for Masuko.
  • the optical brightening agents were dosed to the pre-refining process in order to improve their bonding to fiber surface.
  • the part of the samples was fluidized with the M-700 Microfluidics Processor. Those samples were dispersed with a mixer in 1.6% consistency during 30 minutes. After dispersing, the samples were passed three times through fluidizer so that in the first pass there was only an APM chamber with diameter at 500 ⁇ m. In the second pass, the fiber suspension was passed through two sequential chambers with diameters at 500 ⁇ m and 200 ⁇ m. The third pass was carried out so that the fiber suspension passed through sequential 500 ⁇ m and 100 ⁇ m diameter chambers. The condenser of the fluidizer was switched off during all these trials, as it was found to improve fibrillation in the first part of experiments.
  • the grinded samples were dispersed in 2% consistency with a mixer during 15 minutes before the treatment with Masuko.
  • the dispersed samples were passed four times through Masuko in such a way that in the first pass the gap between the grinding stones was looser than with the following three passes.
  • the grinder was washed after the first and third pass.
  • the gel-like fiber suspensions obtained from Masuko and from fluidizer were characterized by measuring viscosity (Brookfield) and turbidity of the samples and by observing optical microscope and SEM images of the samples. In addition, with centrifugation measurements the dry matter content was measured from both the liquid and the solid phase in order to determine the amount of nano-sized material in the sample.
  • Paper sheets were made in a laboratory from the produced pulps.
  • Refining result can be estimated by measuring the viscosity level of the nanofibrillated cellulose sample, because the viscosity level of the pulp material goes along with the portion of nanofibrillated cellulose in the pulp.
  • more refined, and thus, more fibrillated nanofibrillated cellulose is more gel-like material than less nanofibrillated cellulose. Therefore, more gel-like material means more nanofibrillated cellulose in the sample and this bigger part of nanofibrillate cellulose can be seen in higher viscosity level in the sample.
  • Samples with optical brightening agent - dosage were clearly more viscous than the reference samples. The amount of unfibrillated fibers can be estimated from optical microscopy pictures.
  • FIGs 2a-2c wherein viscosity results with some optical microscopy pictures of Masuko grinded samples are shown.
  • the figure 2a presents the viscosity results of the reference sample 21, the sample with disulphonic optical brightening agent dosage 22, and the sample with hexasulphonic optical brightening agent dosage 23.
  • Figure 2b shows an optical microscopy picture of the reference sample 21
  • figure 2c shows an optical microscopy picture of the sample 23 with hexasulphonic optical brightening agent dosage.
  • Figures 3a and 3b show an optical microscopy images of fluidisator samples, wherein the reference sample (shown in figure 3a ) and the sample 32 with hexasulphonic optical brightening agent (shown in figure 3b ) are presented. The sample presented in figure 3b with the dosage of the optical brightening agent is clearly better fibrillated than the reference sample shown in figure 3a .
  • Figures 4a and 4b show the same situation with SEM pictures (magnification: 10 000 x) in which the reference sample (in figure 4a ) and the sample with hexasulphonated optical brightening agent addition (in figure 4b ) are presented.
  • the samples with hexasulphonated optical brightening agent looks clearly better compared to the reference sample, as many smaller fibrils can be seen in the image.
  • FIG. 5 shows turbidity and centrifugation results of the fluidized samples.
  • the reference sample 51, the sample 52 with disulphonic type of the optical brightening agent dosage, and the sample 53 with addition of hexasulphonic type of the optical brightening agent are presented.
  • the samples with OBA dosages were the most nano-sized.
  • centrifugation results indicated that amount of nano-sized material increases along with OBA addition.

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Claims (12)

  1. Verfahren zur Herstellung von Pulpe, wobei die hergestellte Pulpe mindestens 30 Gew.-% nanofibrilliertes Zellulosematerial enthält, gemessen aus der getrockneten Pulpe, wobei das Verfahren Folgendes umfasst:
    - Einbringen von Rohstoff in ein System, wobei der Rohstoff Zellulose beinhaltet,
    - Zudosieren mindestens eines Typs eines optischen Aufhellers als ein Veredelungsadditiv zu dem System und
    Veredeln des Rohstoffs in Gegenwart des zudosierten optischen Aufhellers in mindestens einer Vorveredelungsstufe oder Fibrillierungsstufe, um fibrilläres Zellulosematerial zu bilden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Veredelung in Gegenwart des zudosierten optischen Aufhellers in mindestens einer Fibrillierungsstufe vorgenommen wird, um fibrilläres Zellulosematerial zu bilden.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass hergestellte Pulpe mindestens 40 Gew.-%, mindestens 50 Gew.-%, mindestens 60 Gew.-% oder mindestens 70 Gew.-% nanofibrilliertes Zellulosematerial enthält, gemessen aus der getrockneten Pulpe.
  4. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 3, dadurch gekennzeichnet, dass mindestens ein Teil des Rohstoffs aus der folgenden Gruppe ausgewählt ist:
    - ungebleichter Zellstoff,
    - gebleichter Zellstoff,
    - ungebleichter chemothermischer Zellstoff und
    - gebleichter chemothermischer Zellstoff.
  5. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 4, dadurch gekennzeichnet, dass mindestens ein Typ des optischen Aufhellers vor der Vorveredelungsstufe zudosiert wird.
  6. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 5, dadurch gekennzeichnet, dass mindestens ein Typ des optischen Aufhellers zu der Vorveredelungsstufe zugegeben wird.
  7. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 6, dadurch gekennzeichnet, dass mindestens ein Typ des optischen Aufhellers vor der Fibrillierungsstufe zudosiert wird.
  8. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 7, dadurch gekennzeichnet, dass mindestens ein Typ des optischen Aufhellers zu der Fibrillierungsstufe zugegeben wird.
  9. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 8, dadurch gekennzeichnet, dass mindestens ein zudosierter optischer Aufheller-Typ aus der Gruppe von Stilben-, Cumarin- und Pyrazolinverbindungen ausgewählt ist.
  10. Verwendung einer Pulpe in nanofibrillierten Zellulose-Verbundstoffen, wobei mindestens ein Teil der Pulpe nach dem Verfahren nach einem der vorhergehenden Ansprüche hergestellt wird.
  11. Verwendung einer Pulpe beim Herstellen von Papier oder Pappe, einschließlich
    - Rohpapierproduktion und
    - Endbearbeitungsstufen von Papier oder Pappe,
    wobei mindestens ein Teil der Pulpe nach dem Verfahren nach einem der vorhergehenden Ansprüche 1 bis 9 hergestellt wird.
  12. Verwendung nach Anspruch 11, wobei die Endbearbeitungsstufen Beschichtungen für das Papier oder die Pappe umfassen.
EP10832694.3A 2009-11-24 2010-11-05 Verfahren zur herstellung einer nanofibrillierten zellulosepulpe und verwendung der pulpe bei der papierherstellung in nanofibrillierten zellulose-verbundstoffen Active EP2504487B1 (de)

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FI20096233A FI123289B (fi) 2009-11-24 2009-11-24 Menetelmä nanofibrilloidun selluloosamassan valmistamiseksi ja massan käyttö paperinvalmistuksessa tai nanofibrilloiduissa selluloosakomposiiteissa
PCT/FI2010/050897 WO2011064441A1 (en) 2009-11-24 2010-11-05 Method for manufacturing nanofibrillated cellulose pulp and use of the pulp in paper manufacturing or in nanofibrillated cellulose composites

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FI20096233A0 (fi) 2009-11-24
WO2011064441A1 (en) 2011-06-03
EP2504487A1 (de) 2012-10-03
CN102686799A (zh) 2012-09-19
EP2504487A4 (de) 2014-01-22
US20130000855A1 (en) 2013-01-03
FI20096233A (fi) 2011-05-25

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