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WO2021061718A1 - Pâtes à papier commerciales composées de fibres de pâte à surface aggrandie et leurs procédés de fabrication - Google Patents

Pâtes à papier commerciales composées de fibres de pâte à surface aggrandie et leurs procédés de fabrication Download PDF

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Publication number
WO2021061718A1
WO2021061718A1 PCT/US2020/052138 US2020052138W WO2021061718A1 WO 2021061718 A1 WO2021061718 A1 WO 2021061718A1 US 2020052138 W US2020052138 W US 2020052138W WO 2021061718 A1 WO2021061718 A1 WO 2021061718A1
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WO
WIPO (PCT)
Prior art keywords
pulp
feed
fibers
equal
market
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.)
Ceased
Application number
PCT/US2020/052138
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English (en)
Inventor
Harshad PANDE
Bruno Marcoccia
Gwen Johnston
David Lloyd
Bradley Langford
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.)
Domtar Paper Co LLC
Original Assignee
Domtar Paper Co LLC
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 Domtar Paper Co LLC filed Critical Domtar Paper Co LLC
Priority to US17/754,098 priority Critical patent/US20220356648A1/en
Priority to CA3150210A priority patent/CA3150210A1/fr
Publication of WO2021061718A1 publication Critical patent/WO2021061718A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • D21D1/30—Disc mills
    • D21D1/306—Discs
    • 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
    • D21H11/08—Mechanical or thermomechanical pulp
    • 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
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • 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
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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
    • 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
    • D21D1/34—Other mills or refiners
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration

Definitions

  • the present invention relates generally to pulps, and more particularly, but without limitation, to market pulps comprising surface enhanced pulp fibers.
  • Market pulp is pulp that is produced at a first mill and shipped to a second mill for further processing (e.g., papermaking).
  • Market pulps typically include fibrillated fibers that, when incorporated into a furnish used in the papermaking process, can strengthen the wet web and the final paper product.
  • fibers are fibrillated using a relatively low refining energy (e.g., between 20 and 80 kilowatt-hours per ton of fiber) and at a specific edge load that is between 0.4 and 0.8 Watt-seconds per meter.
  • Some refining processes fibrillate pulp fibers under conditions that deviate from those conventionally used such that the fibers can achieve a higher degree of fibrillation.
  • Such highly fibrillated fibers can, in at least some instances, increase the wet-web strength and dry strength of a paper product to a greater extent than conventionally-refined fibers.
  • these fibers can have a higher water retention value (WRV) than conventionally-refined fibers and, as such, can be difficult to dry. Additionally, these fibers can be difficult to rehydrate.
  • WSV water retention value
  • the difficulty in drying and rehydrating highly fibrillated pulp fibers can render their use in market pulp challenging. Because market pulp is shipped to a second mill, and transporting a pulp slurry comprising mostly water can be expensive, market pulp is preferably dry to reduce delivery costs. And, dry market pulp is generally rehydrated and repulped in the second mill for use in the papermaking process.
  • the high WRV of highly fibrillated fibers may limit the amount of moisture that can be removed from a market pulp including such fibers — rendering the market pulp expensive to transport — and such a market pulp, because it can be difficult to rehydrate, may be unsatisfactory for use in the papermaking process.
  • pulps comprising these highly fibrillated fibers are generally used in integrated pulp mills where the pulp slurry can be made and used to form a paper product without having to dry the pulp, rather than non-integrated pulp mills where the pulp is produced and shipped to a producer of a paper product. Accordingly, there is a need in the art for a process of making a low moisture content, rehydratable market pulp that includes highly fibrillated pulp fibers such that pulp producers can deliver such highly fibrillated pulp fibers to a paper producer in a cost- effect manner.
  • the present methods address this need in the art at least by incorporating both highly-fibrillated surface enhanced pulp fibers (SEPF) and unrefined pulp fibers into the market pulp.
  • SEPF can have a length weighted average fiber length that is at least 0.20 millimeters (mm) and an average hydrodynamic specific surface area that is greater than or equal to 10 square meters per gram (m 2 /g). While the SEPF may otherwise be difficult to dry and rehydrate, incorporating both the SEPF and unrefined pulp fibers into the pulp can facilitate drying during the pulp-making process and rehydration of the market pulp when it is used to form a paper product.
  • the produced market pulp may accordingly be dryable to a greater extent (e.g., to reach a lower moisture content) than a pulp comprising SEPF alone or SEPF in combination with conventionally-refined fibers, at least for a given energy expended to dry the pulp.
  • the market pulp can provide a cost-effective mechanism by which the highly- fibrillated SEPF can be delivered to a mill to make a paper product.
  • Some of the present methods of making a market pulp comprise separating a slurry that comprises a plurality of pulp fibers into at least a first pulp feed comprising a first plurality of pulp fibers and a second pulp feed comprising a second plurality of pulp fibers.
  • the first and second pulp feeds need not originate from the same slurry (e.g., a slurry need not be separated at least the first and second pulp feeds).
  • the first pulp feed can be refined.
  • the first pulp feed can be refined at least by, for each of one or more mechanical refiners, introducing the first pulp feed between two refining elements of the refiner and rotating at least one of the refining elements.
  • Each of the refining elements in some methods, comprises a plurality of bars, each protruding from a surface of the refining element and having a width that is less than or equal to 1.3 mm and/or a plurality of grooves defined by the bars, each having a width that is less than or equal to 2.5 mm.
  • refining the first pulp feed is performed such that each of the refiner(s) operates at a specific edge load that is between 0.1 and 0.3 Watt-seconds per meter (W-s/m) and/or the refiner(s) consume at least 300 kilowatt- hours (kWh), optionally at least 650 kWh, per ton of fiber in the first pulp feed.
  • W-s/m Watt-seconds per meter
  • the refiner(s) consumes least 300 kilowatt- hours (kWh), optionally at least 650 kWh, per ton of fiber in the first pulp feed.
  • the second pulp feed is not refined.
  • Some methods comprise combining the first pulp feed (e.g., after it is refined) and the second pulp feed to produce a third pulp feed, optionally such that less than or equal to 10% of the fibers of the third pulp feed, by weight, are the first pulp fibers.
  • the first pulp feed is directed into a tank before combining the first and second pulp feeds.
  • Some methods comprise drying the third pulp feed, optionally such that less than or equal to 15% of the market pulp, by weight, is liquid.
  • Some methods comprise baling the market pulp.
  • Some of the present market pulps comprise a first plurality of pulp fibers and a second plurality of pulp fibers, wherein, optionally, less than or equal to 10% of the fibers of the market pulp, by weight, are the first pulp fibers. For some pulps, less than or equal to 15% of the market pulp, by weight, is liquid.
  • the first pulp fibers have a length weighted average fiber length that is greater than or equal to 0.20 millimeters (mm) and an average hydrodynamic specific surface area that is greater than or equal to 10 square meters per gram (m 2 /g) (e.g., after refining).
  • the second pulp fibers in some embodiments, have an average hydrodynamic specific surface area that is less than or equal to 2.0 m 2 /g.
  • the first pulp fibers and/or the second pulp fibers are softwood fibers.
  • the market pulp in some embodiments, has a basis weight that is greater than or equal to 500 grams per square meter. Some embodiments comprise a bale of any of the present market pulps.
  • Coupled is defined as connected, although not necessarily directly, and not necessarily mechanically; two items that are “coupled” may be unitary with each other.
  • the terms “a” and “an” are defined as one or more unless this disclosure explicitly requires otherwise.
  • the term “substantially” is defined as largely but not necessarily wholly what is specified - and includes what is specified; e.g., substantially 90 degrees includes 90 degrees and substantially parallel includes parallel - as understood by a person of ordinary skill in the art. In any disclosed embodiment, the terms “substantially” and “approximately” may be substituted with “within [a percentage] of’ what is specified, where the percentage includes 0.1, 1, 5, and 10 percent.
  • any embodiment of any of the products, systems, and methods can consist of or consist essentially of - rather than comprise/include/have - any of the described steps, elements, and/or features.
  • the term “consisting of’ or “consisting essentially of’ can be substituted for any of the open-ended linking verbs recited above, in order to change the scope of a given claim from what it would otherwise be using the open- ended linking verb.
  • a device or system that is configured in a certain way is configured in at least that way, but it can also be configured in other ways than those specifically described.
  • FIG. 1 is a schematic of a system that can be used to make a market pulp that includes both surface enhanced pulp fibers and unrefined pulp fibers.
  • FIG. 2 is a schematic of two refining elements that can be used in the one or more refiners of the system of FIG. 1 to produce surface enhanced pulp fibers.
  • FIG. 3A is a schematic of a refining unit that can be used in the system of FIG. 1 to produce surface enhanced pulp fibers.
  • the refining unit of FIG. 3A includes a single refiner through which a pulp feed can be recirculated.
  • FIG. 3B is a schematic of another refining unit that can be used in the system of FIG. 1 to produce surface enhanced pulp fibers.
  • the refining unit of FIG. 3B includes two refiners, where a pulp feed can be recirculated through one of the refiners.
  • system 10 that can be used to perform some of the present methods. While some methods are described with reference to system 10, system 10 is not limiting on those methods, which can be performed using any suitable system.
  • Some methods of making a market pulp include a step of separating a slurry that comprises a plurality of pulp fibers into at least first and second pulp feeds (e.g., 18 and 22).
  • the first pulp feed can comprise a first plurality of fibers (e.g., a first portion of the slurry’s pulp fibers) and the second pulp feed can comprise a second plurality of fibers (e.g., a second portion of the slurry’s pulp fibers).
  • the slurry can be contained within a reservoir (e.g., 14), and the pulp fibers of the slurry (and thus the first and second pulp fibers) can be hardwood pulp fibers (e.g., from oak, gum, maple, poplar, eucalyptus, aspen, birch, and/or the like), softwood pulp fibers (e.g., from spruce, pine, first, hemlock, redwood, and/or the like), non wood pulp fibers (e.g., from kenaf, hemp, straws, bagasse, and/or the like), or a combination thereof.
  • hardwood pulp fibers e.g., from oak, gum, maple, poplar, eucalyptus, aspen, birch, and/or the like
  • softwood pulp fibers e.g., from spruce, pine, first, hemlock, redwood, and/or the like
  • non wood pulp fibers e.g., from kenaf, hemp,
  • the pulp fibers of the slurry can be obtained from any suitable process, such as, for example, a chemical process (e.g., a kraft process), a mechanical process, a thermomechanical process, a chemi-thermomechanical process, and/or the like, and can be bleached or unbleached.
  • the slurry can have any suitable consistency to promote runnability in system 10; for example, less than or equal to any one of, or between any two of, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1% of the slurry, by weight, can be the pulp fibers.
  • Some methods include a step of refining the first pulp feed to fibrillate the first pulp fibers.
  • the first pulp feed can be refined in a refining unit (e.g., 26) of system 10 that includes one or more mechanical refiners (e.g., 30a and/or 30b) (FIGs. 3A and 3B).
  • each of the refiner(s) can comprise at least two refining elements (e.g., 34), each including a plurality of bars (e.g., 42) that extend outwardly from a surface (e.g., 38) of the refining element and define a plurality of grooves (e.g., 46).
  • each of the refiner(s) can be a disk refiner (e.g., a single-disk refiner, a double-risk refiner, or a multi-disk refiner) (e.g., in which the refining elements are refiner plates) or a conical refiner (e.g., in which the refining elements are conical refiner fillings).
  • the first pulp feed can be refined at least by, for each of the refiner(s), introducing the first pulp feed between the refining elements and rotating at least one, optionally each, of the refining elements.
  • the bars can thereby impart compression and shearing forces on the first pulp fibers to increase the fibrillation, and thus the average hydrodynamic specific surface area, thereof.
  • each of the refining elements can have a fine bar pattern and, optionally, the refiner(s) can be operated at a low intensity (e.g., at a low specific edge load (SEL)), compared to conventional refining processes.
  • SEL specific edge load
  • each of the bars can have a width that is less than or equal to any one of, or between any two of, 1.3 millimeters (mm), 1.2 mm, 1.1 mm, 1.0 mm, 0.9 mm, or 0.8 mm (e.g., less than or equal to 1.3 mm or 1.0 mm) and each of the grooves can have a width that is less than or equal to any one of, or between any two of, 2.5 mm, 2.3 mm, 2.1 mm, 1.9 mm, 1.7 mm, 1.5 mm, or 1.3 mm (e.g., less than or equal to 2.5 mm , 1.6 mm, or 1.3 mm).
  • refining the first pulp feed can be performed such that each of the refiner(s) operates at a SEL that is less than or equal to any one of, or between any two of, 0.70 Watt-seconds per meter (W-s/m), 0.60 W-s/m, 0.50 W-s/m, 0.40 W-s/m, 0.30 W-s/m, 0.25 W-s/m, 0.20 W-s/m, 0.15 W-s/m, or 0.10 W-s/m (e.g., between 0.1 and 0.3 W-s/m or 0.1 and 0.2 W-s/m).
  • W-s/m 0.70 Watt-seconds per meter
  • the first pulp feed can be refined using a large amount of refining energy, compared to conventional processes, to achieve a high degree of fibrillation.
  • refining the first pulp feed can be performed such that, per ton of fiber in the first pulp feed, the refiner(s) consume greater than or equal to any one of, or between any two of, 300 kilowatt-hours (kWh), 400 kWh, 500 kWh, 600 kWh, 700 kWh, 800 kWh, 900 kWh, or 1,000 kWh (e.g., greater than or equal to 300 kWh or 650 kWh per ton of fiber in the first pulp feed).
  • the refining energy expended can depend at least in part on the type of fibers in the first pulp feed and the desired degree of fibrillation.
  • the refining energy can be between 300 and 650 kWh per ton of fiber and when the first pulp fibers are softwood fibers, the refining energy can be at least 650 kWh, optionally at least 1,000 kWh, per ton of fiber (e.g., because softwood fibers, which are typically longer than hardwood fibers, may be subjected to more refining than hardwood fibers before fiber shortening and fines production adversely affects fiber quality).
  • each of the refiner(s) can consume, per ton of fiber in the first pulp feed, less than or equal to any one of, or between any two of, 110 kWh, 100 kWh, 90 kWh, 80 kWh, 70 kWh, 60 kWh, 50 kWh, 40 kWh, or 30 kWh each time the first pulp feed is passed through the refiner.
  • the first pulp feed can be recirculated through at least one of the refiner(s) and/or passed through multiple refiners such that the cumulative energy consumed by the refiner(s) reaches the desired level (e.g., at least 300 kWh or 650 kWh per ton of fiber).
  • the one or more refiners can consist of a single refiner (e.g., 30a) (e.g., where, for each of the refiner’s refining elements, each of the bars has a width that is less than or equal to 1.3 mm and each of the grooves has a width that is less than or equal to 1.6 mm) and the first pulp feed can be passed through the refiner a plurality of times (e.g., greater than or equal to any one of, or between any two of, 2, 6, 10, 14, 18, 22, or 26 times) until the refiner consumes the desired refining energy.
  • a single refiner e.g., 30a
  • each of the bars has a width that is less than or equal to 1.3 mm and each of the grooves has a width that is less than or equal to 1.6 mm
  • the first pulp feed can be passed through the refiner a plurality of times (e.g., greater than or equal to any one of, or between any two of, 2, 6, 10, 14, 18, 22, or 26 times
  • the one or more refiners can comprise one or more first refiners (e.g., 30a) (e.g., a single first refiner) and one or more second refiners (e.g., 30b) such that the first pulp feed passes through multiple refiners.
  • Each of the first refiner(s) can be configured to fibrillate the first pulp fibers with less refinement than the second refiner(s).
  • each of the bars can have a width that is greater than or equal to 1.0 mm
  • each of the grooves can have a width that is greater than or equal 1.6 mm
  • the first refiner can operate at a SEL between 0.2 and 0.3 W-s/m.
  • the first pulp feed can be introduced into the second refiner(s) after passing through the first refiner(s) and, for each of the second refiner(s), each of the bars can have a width that is less than or equal to 1.0 mm, each of the grooves can have a width that is less than or equal to 1.6 mm, and the second refiner can operate at a SEL between 0.1 and 0.2 W-s/m.
  • the first pulp feed can be recirculated through at least one of the second refiner(s) (e.g., as described with respect to FIG. 3A).
  • Such high-energy refining (e.g., at least 300 kWh per ton of fiber) performed using refining elements having a fine bar pattern (e.g., any of those described above) and/or at low intensity (e.g., at a SEL between 0.1 and 0.3 W-s/m) can yield larger increases in the average hydrodynamic specific area of the first pulp fibers than conventional refining processes while mitigating reductions in fiber length.
  • the first pulp feed can be refined such that the average hydrodynamic specific surface area of the first pulp fibers increases by at least 300% (e.g., at least 700%) while the length weighted average fiber length of the first pulp fibers decreases by less than 30%.
  • the fibrillated first pulp fibers can have a length weighted average fiber length that is greater than or equal to any one of, or between any two of, 0.20 millimeters (mm), 0.30 mm, 0.40 mm, 0.50 mm, 0.60 mm, 0.70 mm, 0.80 mm, 0.90 mm, 1.0 mm, 1.5 mm, or 2.0 mm (e.g., greater than or equal to 0.20 mm, 0.30 mm, or 0.40 mm or between 1.0 mm and 2.0 mm), and an average hydrodynamic specific surface area that is greater than or equal to any one of, or between any two of, 10 square meters per gram (m 2 /g), 12 m 2 /g, 14 m 2 /g, 16 m 2 /g, 18 m 2 /g, 20 m 2 /g, or larger (e.g., greater than or equal to 10 m 2 /g).
  • m 2 /g square meters per gram
  • the number of SEPF can be at least 12,000 per milligram on an oven-dry basis (e.g., based on a sample of the SEPF that is dried in an oven set at 105 °C for 24 hours).
  • a description of SEPF and processes by which SEPF can be made are set forth in further detail in U.S. Patent Application No. 13/836,760, filed March 15, 2013, and published as Pub. No. US 2014/0057105 on February 27, 2014, which is hereby incorporated by reference.
  • the SEPF due at least in part to their large average hydrodynamic specific surface area, can improve the wet-web strength and/or dry strength of a paper product to a greater extent than conventionally-refined fibers when incorporated therein.
  • the market pulp can be produced for transportation to a separate mill where the market pulp can be rehydrated, repulped, and used to form a paper product.
  • the market pulp preferably has a low moisture content to reduce transportation costs and a composition that facilitates the rehydration thereof.
  • the market pulp can include the SEPF such that a paper product produced therefrom can attain the above-described improvements in strength; however the SEPF can have a comparatively high water retention value (WRV), which may render the SEPF difficult to dry (e.g., may require a large amount of energy for drying), particularly because the market pulp can have a high basis weight compared to paper products (e.g., a basis weight that is at least 500 grams per square meter (gsm)).
  • the SEPF can be difficult to rehydrate because of the SEPF’s physical characteristics (e.g., the large average hydrodynamic specific surface area thereof).
  • some methods include a step of combining the refined first pulp feed and the second pulp feed to produce a third pulp feed (e.g., 62) that can be used to make the market pulp.
  • a third pulp feed e.g., 62
  • the second pulp feed can be unrefined; for example, the second pulp fibers can have an average hydrodynamic specific surface area that is less than or equal to any one of, or between any two of, 2.4 m 2 /g, 2.2 m 2 /g, 2.0 m 2 /g, 1.8 m 2 /g, 1.6 m 2 /g, 1.4 m 2 /g, 1.2 m 2 /g, 1.0 m 2 /g, 0.8 m 2 /g, or 0.6 m 2 /g (e.g., less than or equal to 2.0 m 2 /g).
  • the combination of SEPF and unrefined pulp fibers in the third pulp feed can promote the dryability thereof, e.g., such that the third pulp feed can be dried to a greater extent than a pulp feed whose pulp fibers comprise SEPF alone or in combination with conventionally-refined fibers, at least for a given amount energy used to dry the third pulp feed.
  • the refined first pulp feed and second pulp feed can be combined such that at least a majority of the pulp fibers in the third pulp feed are unrefined, which can facilitate drying.
  • the refined first pulp feed and the second pulp feed can be combined such that less than or equal to any one of, or between any two of, 15%, 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1% (e.g., less than or equal to 10% or between 1% and 10%) of the fibers of the third pulp feed, by weight, are the first pulp fibers (e.g., the SEPF) and/or greater than or equal to any one of, or between any two of, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, or 99% (e.g., greater than or equal to 90%) of the fibers of the third pulp feed, by weight, are the second pulp fiber fibers (e
  • Some methods comprise directing the refined first pulp feed into a tank (e.g. 58) before combining the refined first pulp feed and the second pulp feed.
  • the refined first pulp feed can be temporarily stored in and metered from the tank (e.g., to facilitate mixing of the desired proportions of SEPF and unrefined pulp fibers).
  • the refined first pulp feed and the second pulp feed originate from a common source (e.g., the slurry)
  • the first and second pulp feeds can originate from different sources.
  • the first pulp fibers (e.g., the SEPF) and second pulp fibers (e.g., the unrefined pulp fibers) can be of the same type (e.g., hardwood pulp fibers, softwood pulp fibers, or non- wood pulp fibers) or of different types.
  • Some methods include a step of drying the third pulp feed in a drying unit (e.g., 66) to produce the market pulp.
  • the third pulp feed can be dried in any suitable manner, such as, for example, by draining (e.g., on a wire onto which the third pulp feed is deposited), pressing, and/or heating (e.g., with heated air) the third pulp feed. Substantially all of the moisture of the third pulp feed can be removed when it is dried.
  • drying the third pulp feed can be performed such that less than or equal to any one of, or between any two of, 20%, 19%, 18%, 17%, 16%, 15%, 14%, 13%, 12%, 11%, or 10% (e.g., less than or equal to 15% or 10%) of the market pulp, by weight, is liquid.
  • the presence of unrefined pulp fibers in addition to the SEPF in the third pulp feed can facilitate drying such that the market pulp can achieve such low moisture contents and/or the energy required to do so, thereby reducing the costs of transporting the market pulp.
  • the market pulp can be processed further in a packaging unit (e.g., 70) to prepare the market pulp for transport.
  • Some methods include a step of baling the market pulp (e.g., to produce one or more bales of the market pulp).
  • the third pulp feed can be dried such that the market pulp forms a sheet and the sheet can be cut into smaller sheets (e.g., having dimensions suitable for shipment) that can be stacked and baled.
  • the market pulp can be wound onto a roll.
  • the market pulp can be made such that the market pulp has a basis weight that is greater than or equal to any one of, or between any two of, 500 gsm, 600 gsm, 700 gsm, 800 gsm, 900 gsm, 1,000 gsm, 1,100 gsm, 1,200 gsm, 1,300 gsm, 1,400 gsm, or 1,500 gsm.
  • the produced market pulp can have any of the relative proportions of the first pulp fibers (e.g., SEPF) and second pulp fibers (e.g., unrefined pulp fibers) described above with reference to the third pulp feed.
  • less than or equal to any one of, or between any two of, 15%, 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, or 1% (e.g., less than or equal to 10% or between 1% and 10%) of the fibers of the market pulp, by weight, can be the first pulp fibers and/or greater than or equal to any one of, or between any two of, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, or 99% (e.g., greater than or equal to 90%) of the fibers of the market pulp, by weight, can be the second pulp fibers.
  • the second (e.g., unrefined) pulp fibers can facilitate rehydration of the market pulp such that the market pulp can be repulped and used to form a paper product.
  • the market pulp can accordingly provide a cost-effective mechanism by which SEPF can be delivered to a separate mill and used in a papermaking process.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Selon l'invention, un procédé de fabrication d'une pâte à papier commerciale peut comprendre la séparation d'une suspension pâteuse comprenant une pluralité de fibres de pâte dans au moins une première et une deuxième alimentation en pâte. La première charge de pâte peut être raffinée au moins par son introduction, dans chacun d'un ou plusieurs raffineurs mécaniques, entre deux éléments de raffinage du raffineur et par la rotation d'au moins un des éléments de raffinage, chacun des éléments de raffinage comprenant une pluralité de barres et une pluralité de rainures, la largeur de chacune des barres étant inférieure ou égale à 1,3 mm et la largeur de chacune des rainures étant inférieure ou égale à 2,5 mm. Le ou les raffineurs peuvent consommer au moins 300 kWh par tonne de fibre. La première alimentation en pâte raffinée et la deuxième alimentation en pâte, qui n'est pas raffinée, peuvent être combinées pour produire une troisième alimentation en pâte qui peut être séchée.
PCT/US2020/052138 2019-09-23 2020-09-23 Pâtes à papier commerciales composées de fibres de pâte à surface aggrandie et leurs procédés de fabrication Ceased WO2021061718A1 (fr)

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US17/754,098 US20220356648A1 (en) 2019-09-23 2020-09-23 Market Pulps Comprising Surface Enhanced Pulp Fibers and Methods of Making the Same
CA3150210A CA3150210A1 (fr) 2019-09-23 2020-09-23 Pates a papier commerciales composees de fibres de pate a surface aggrandie et leurs procedes de fabrication

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US201962904393P 2019-09-23 2019-09-23
US62/904,393 2019-09-23

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US20230320540A1 (en) * 2022-04-08 2023-10-12 The Procter & Gamble Company Sanitary Tissue Products Comprising Once-Dried Fibers
US12415672B2 (en) 2022-06-17 2025-09-16 The Procter & Gamble Company Sanitary tissue product packages conveying sustainability
US12503297B2 (en) 2023-06-14 2025-12-23 The Procter & Gamble Company Digital arrays comprising sustainable sanitary tissue products

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US11473245B2 (en) 2016-08-01 2022-10-18 Domtar Paper Company Llc Surface enhanced pulp fibers at a substrate surface
WO2018075627A1 (fr) 2016-10-18 2018-04-26 Domtar Paper Company, Llc Procédé de production de fibres de pâte améliorées à surface chargée par une charge
US11441271B2 (en) 2018-02-05 2022-09-13 Domtar Paper Company Llc Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same
EP4148182B1 (fr) * 2019-03-20 2025-11-19 Billerud Aktiebolag (publ) Procédé de production
CA3150203A1 (fr) * 2019-09-23 2021-04-01 Bradley Langford Mouchoirs et serviettes en papier incorporant des fibres de pate a papier a surface agrandie et leurs procedes de fabrication
WO2021061747A1 (fr) * 2019-09-23 2021-04-01 Domtar Paper Company, Llc Produits en papier comprenant des fibres de pâte à papier exaltées de surface et ayant des résistances à l'état humide et à sec découplées et leurs procédés de fabrication
US12428788B2 (en) 2019-10-07 2025-09-30 Domtar Paper Company, Llc Molded pulp products incorporating surface enhanced pulp fibers and methods of making the same

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US20190242062A1 (en) * 2018-02-05 2019-08-08 Pande HARSHAD Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same

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US20230320540A1 (en) * 2022-04-08 2023-10-12 The Procter & Gamble Company Sanitary Tissue Products Comprising Once-Dried Fibers
US12415672B2 (en) 2022-06-17 2025-09-16 The Procter & Gamble Company Sanitary tissue product packages conveying sustainability
US12503297B2 (en) 2023-06-14 2025-12-23 The Procter & Gamble Company Digital arrays comprising sustainable sanitary tissue products

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