WO2020014351A1 - Procédé de fabrication de papier ou de carton - Google Patents

Procédé de fabrication de papier ou de carton Download PDF

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Publication number
WO2020014351A1
WO2020014351A1 PCT/US2019/041190 US2019041190W WO2020014351A1 WO 2020014351 A1 WO2020014351 A1 WO 2020014351A1 US 2019041190 W US2019041190 W US 2019041190W WO 2020014351 A1 WO2020014351 A1 WO 2020014351A1
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WO
WIPO (PCT)
Prior art keywords
paper
pulp slurry
pulp
carbohydrate
board
Prior art date
Application number
PCT/US2019/041190
Other languages
English (en)
Inventor
Xinglian Geng
Chen Yun CHUNG
John Powell
Priscilla Damiao MONTOAN
Original Assignee
Novozymes A/S
Corn Products Development Inc.
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 Novozymes A/S, Corn Products Development Inc. filed Critical Novozymes A/S
Priority to CA3102221A priority Critical patent/CA3102221A1/fr
Priority to CN201980044039.4A priority patent/CN112601859A/zh
Priority to MX2021000113A priority patent/MX2021000113A/es
Priority to EP19745529.8A priority patent/EP3821073A1/fr
Priority to US17/258,290 priority patent/US20210269972A1/en
Priority to BR112021000294-4A priority patent/BR112021000294A2/pt
Publication of WO2020014351A1 publication Critical patent/WO2020014351A1/fr

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Classifications

    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/005—Microorganisms or enzymes
    • 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
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/22—Proteins
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/25—Cellulose
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch 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
    • 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
    • D21H21/18—Reinforcing 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper
    • D21H27/004—Tissue paper; Absorbent paper characterised by specific parameters
    • D21H27/005—Tissue paper; Absorbent paper characterised by specific parameters relating to physical or mechanical properties, e.g. tensile strength, stretch, softness
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard

Definitions

  • SEQ ID No: 1 is a Q120H variant of the mature endoglucanase shown as SEQ ID NO: 9 of WO 96/29397.
  • SEQ ID No: 2 is a variant of endoglucanase.
  • the present invention relates to methods of making paper or board and methods of improving refinability and/or strengthening potential of pulp for use in a paper or board mill.
  • Enzymes are known in the art as means to alter the response of cellulosic fiber to refining to reduce manufacturing costs and/or improve certain properties of paper and board. Natural or modified polymers are generally added after or in the absence of refining to improve pulp performance (e.g. drainage, dewatering, retention, etc.) within the paper machine - reduce manufacturing costs - and provide desired structural and strength properties in the finished goods.
  • W014058557 describes a method of producing paper or paperboard, wherein an enzyme and a polymer is added during the process.
  • W017029238 relates to an aqueous surface treatment composition for paper and board comprising degraded starch.
  • a method of making paper and paper products is described where a composition comprising laccase, lipase and cationic fixative polymer is used as an additive to a lignocellulosic suspension.
  • the invention provides mixtures comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent that is useful for making paper or board and for improving refinability and/or strengthening potential of pulp for use in a paper or board mill.
  • the invention provides a method of making paper or board comprising the steps of:
  • the method of improving refinability and/or strengthening potential of pulp for use in a paper or board mill comprises a step of introducing at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a once- dried or never-dried pulp slurry prior to or after refining in the paper or board mill.
  • the treated pulp slurry is refined to a target property selected from the group consisting of: reduced freeness of a refined, treated pulp slurry, increased tensile strength of a paper or board product, an increased structural property of a paper or board product, and combinations thereof.
  • the invention provides a method of making a pulp or pulp slurry, comprising: a) introducing at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a pulp or pulp slurry prior to refining, and b) refining the treated pulp or pulp slurry to form a refined, treated pulp or pulp slurry.
  • the invention provides a method of making a pulp or pulp slurry, comprising: introducing at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a pulp or pulp slurry prior to or after refining to obtain a refined, treated pulp or pulp slurry.
  • the mixture disclosed in this specification comprises at least one carbohydrate- active enzyme and at least one liquid natural polymer, and optionally at least one strength agent.
  • a modified liquid natural polymer disclosed in this specification is made by the process of mixing a natural polymer with at least one carbohydrate-active enzyme and optionally at least one strength agent.
  • the refined, treated pulp slurries are made by the process of introducing to a once-dried or never-dried pulp slurry a mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent, prior to refining the pulp slurry, and reacting the mixture with the pulp slurry for sufficient time to improve at least one property of the pulp slurry for use in making paper or board products.
  • the refined, treated pulp slurries are made by the process of introducing to a once-dried or never-dried pulp slurry a mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent prior to refining the pulp slurry, and reacting the mixture with the pulp slurry for sufficient time that the pulp slurries have a freeness of between 10 ml and 890 ml.
  • Figure 1 presents the effect of pre-treatments of different dosage levels of LNP and of two different carbohydrate active enzymes on the tensile strength of handsheets prepared from the treated fiber.
  • ‘EGA’ and ⁇ QB’ denote cellulases of SEQ ID 1 and SEQ I D 2, respectively.
  • the extension ‘50’ and‘100’ denote dosing levels of 50 grams per ton of dry fiber and 100 grams per ton of dry fiber, respectively.
  • Figure 2 presents the effect of pre-treatments of different dosage levels of LNP and of two different carbohydrate active enzymes on the burst strength index of handsheets prepared from the treated fiber.
  • ‘EGA’ and‘EGB’ denote cellulases of SEQ ID 1 and SEQ ID 2, respectively.
  • the extension ‘50’ and‘100’ denote dosing levels of 50 grams per ton of dry fiber and 100 grams per ton of dry fiber, respectively.
  • Figure 3 presents the effect of the various pre-treatments on the tensile strength indices of handsheets prepared from fiber subjected to various degrees of PFI beating.
  • Figure 4 presents a comparison between the freeness of beaten pulps prepared from pre-treated fiber and the tensile strength indices of handsheets prepared from the pre-treated and beaten fiber.
  • Figure 5 presents the effect of pre-treatments on the bulk of handsheets prepared from fiber subjected to various degrees of PFI beating.
  • Figure 6 presents a comparison between tensile strength indices and bulk in handsheets prepared from fiber subjected to the various pretreatments and to various degrees of PFI beating.
  • Figure 7 presents the effect of pre-treatments on tensile index of handsheets prepared from treated-BEKP.
  • Figure 8 presents the effect of pre-treatments on burst index of handsheets prepared from treated- BEKP.
  • Figure 9 presents the effect of pre-treatments on tensile index of handsheets prepared from treated-BEKP and refined-BSKP at a ratio of 1 : 1 (w/w).
  • TAPPI refers to the Technical Association of the Pulp and Paper Industry, which promulgates standards and guidelines for test methods. Such methods are routinely used within the pulp and paper industry and are available at http://www.TAPPI.org/Publications-Standards/Standards-Methods.
  • Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulosic fibers from wood, fiber crops or waste paper. Consequently, pulp is herein understood as a fluid mixture of fiber and water used to make paper.
  • Pulp slurry refers to a suspension of fiber within a liquid phase.
  • the slurry can be formed using various suitable liquids (e.g. water) and with various ratios of either component and therefore can be described by a range of weight or volume-based consistency values (e.g. solids content, moisture content, etc.).
  • the pulp slurry is the suspension of fiber within a liquid phase before refining and addition of the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to the pulp slurry.
  • Addition of the at least one carbohydrate-active enzyme, the at least one liquid natural polymer, and optionally the at least one strength agent forms a treated pulp slurry, and refining of the treated pulp slurry forms a refined, treated pulp slurry.
  • Standard handsheets are handsheets prepared according to TAPPI Standard T 205:“Forming handsheets for physical tests of pulp”.
  • Refining is the mechanical treatment of pulp fibers to impart to them the appropriate characteristics for papermaking.
  • Refining may be performed by any appropriate process, illustrative processes include, but are not limited to, processes in which pulp slurries are refined between rotating and occasionally static metal elements of, for example, laboratory beaters, or industrial disk or conical refiners. Freeness is a measure of how quickly water is able to drain from a sample of dilute fiber. A sample’s freeness decreases as the drainage rate decreases.
  • Freeness can be measured by any standard method.
  • An illustrative test for measuring freeness is based on gravity dewatering through a screen.
  • the devices are designed so that an operator can judge the rate of dewatering by observing the volume of liquid collected in a graduated cylinder.
  • Fines are objects small enough to pass through a conical hole having a maximum diameter of 76 micrometers.
  • fines include, but are not limited to, small cellulosic materials, parenchyma cells, and other small cells from wood.
  • a natural polymer is a polymer occurring in nature and may e.g. have its origin in plants or animals.
  • suitable natural polymers include but are not limited to starch, cellulose, proteins and natural rubber.
  • Liquid natural polymers are natural polymers modified through at least one means of chemical (e.g. etherification, acetylation, propylation, phosphating, ethylation, acidulation, oxidation, enzymatic), physical and/or mechanical conversion to obtain the natural polymer in liquid form.
  • chemical e.g. etherification, acetylation, propylation, phosphating, ethylation, acidulation, oxidation, enzymatic
  • physical and/or mechanical conversion to obtain the natural polymer in liquid form.
  • Strength agents are natural or synthetic additives employed to improve fiber bonding.
  • Lignocellulosic fibers are fibers from plant dry matter, such as wood, and comprise carbohydrate polymers, such as e.g. cellulose and hemicellulose, and an aromatic polymer such as e.g. lignin.
  • a wet end system is generally the part of the stock preparation and paper or board machine that contacts a slurry of fibers, fillers, and/or other additives.
  • the wet end system includes all of the unit operations between the brown stock washers to the press section where water is pressed from the wet fibrous web and any combination of subunits therein.
  • a dry end system is the part of the papermaking system after the wet-press section (i.e. dryer section to roll).
  • Runnability describes the efficiency with which a furnish - comprising a slurry of papermaking fiber and various additives - undergoes consolidation into a fibrous web via water removal across elements of the paper or board machine.
  • pulp properties can influence the runnability of the furnish on the machine for example, including, but not limited to freeness.
  • the improved property relates to improving the refinability of the pulp slurry and/or strengthening potential of the pulp slurry and/or the runnability of the pulp slurry and/or at least one structural property of paper and board, including but not limited to tensile strength and/or the bulk of the paper or board.
  • liquid natural polymer and cellulase prior to refining also provided the greatest tensile strength while delivering greater freeness than the control or either component when added alone (see Figure 4).
  • Cellulases are known to improve the tensile strength of paper or board products, such as e.g. standard handsheets, often at the expense of bulk. When applied in concert with cellulase, liquid natural polymer surprisingly mitigated the loss of bulk (see Figure 5). Furthermore, pretreatment with the blend of liquid natural polymer and cellulase provided higher tensile strength at higher bulk in resultant handsheets prepared from the refined fiber (see Figure 6).
  • the properties of the pulp slurry are improved after at least one carbohydrate-active enzyme and at least one liquid natural polymer are added to a pulp slurry prior to refining, and optionally at least one strength agent is added to the pulp slurry after refining.
  • the strengthening potential of pulp slurry is improved after at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are added to a pulp slurry prior to refining.
  • the strengthening potential of pulp slurry is improved after at least one carbohydrate-active enzyme and at least one liquid natural polymer are added to a pulp slurry prior to refining, and optionally at least one strength agent is added to the pulp slurry after refining.
  • the structural properties, for example bulk of the paper or board product, prepared from the refined, treated, pulp slurry treated with at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent prior to refining are improved.
  • the structural properties for example bulk of the paper or board product, prepared from the refined, treated, pulp slurry treated with at least one carbohydrate-active enzyme and at least one liquid natural polymer are added to a pulp slurry prior to refining, and optionally at least one strength agent is added to the pulp slurry after refining.
  • the at least one carbohydrate-active enzyme is a cellulase
  • the at least one liquid natural polymer is derived from starch.
  • Such treatment may also be referred to as a pre-treatment.
  • the at least one carbohydrate-active enzyme is an endoglucanase. In a still further aspect the at least one carbohydrate-active enzyme is a GH45. In an even further aspect, the at least one carbohydrate-active enzyme has an amino acid sequence which is at least 80%, 85%, 90%, 95% or 99% identical to SEQ ID No: 1. In a yet further aspect, the at least one carbohydrate- active enzyme has the amino acid sequence of SEQ ID No: 1 or has an amino acid sequence with up to 10, such as 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10, amino acid changes compared to SEQ ID No: 1.
  • the at least one carbohydrate-active enzyme has an amino acid sequence which is at least 80%, 85%, 90%, 95% or 99% identical to SEQ ID No: 2.
  • the at least one carbohydrate-active enzyme has the amino acid sequence of SEQ ID No: 2 or has an amino acid sequence with up to 10, such as 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10, amino acid changes compared to SEQ ID No: 2.
  • Liquid natural polymers suitable for use in the methods described herein include natural polymers. Such polymers are natural polymers that have been modified through at least one chemical (e.g. etherification, acetylation, propylation, phosphating, ethylation, acidulation, oxidation, enzymatic), physical and/or mechanical conversion means to obtain the natural polymer in liquid form.
  • the liquid natural polymer is derived from one or more vegetal sources.
  • the vegetal material is starch.
  • the starch may be derived from corn, waxy maize, cassava, waxy cassava, wheat, potato, rice and pea (or other pulse source, including but not limited to fava bean or lentil), as well as other high amylose or low amylose variants of the vegetal source where a low amylose sources comprises no more than 10% amylose, or less than 5% amylose, or less than 3% amylose, or essentially no amylose (about 0%), and where high amylose sources comprise at least 40% amylose, or at least 50% amylose or at least 60% amylose, or at least 70% amylose, or between about 40% and 80% amylose.
  • the liquid natural polymer is derived from a waxy starch.
  • the liquid natural polymer is derived from a waxy corn starch.
  • Strength agents may also be added to the liquid natural polymers.
  • the combination of at least one liquid natural polymer and at least one carbohydrate-active enzyme for use in the present invention further comprises at least one strength agent.
  • the strength agents suitable for use with the disclosed methods and claims include, but are not limited to, natural or synthetic additives employed to improve fiber bonding.
  • additives include, but are not limited to, carboxymethyl cellulose (CMC), glyoxalated polyacrylamide (GPAM), polyamide-epichlorohydrin (PAE), polyaminoamide-epichlorohydrin (PAAE), cationic polyacrylamide (CPAM), anionic polyacrylamide (APAM), amphoteric polyacrylamide, urea-formaldehyde (UF) and melamineformaldehyde (MF).
  • CMC carboxymethyl cellulose
  • GPAM glyoxalated polyacrylamide
  • PAE polyamide-epichlorohydrin
  • PAAE polyaminoamide-epichlorohydrin
  • CPAM cationic polyacrylamide
  • APAM anionic polyacrylamide
  • amphoteric polyacrylamide amphoteric polyacrylamide, urea-formaldehyde (UF) and melamineformaldehyde (MF).
  • the at least one carbohydrate-active enzyme is added to the natural polymer during, before or after it has been converted to a liquid natural polymer. In another aspect the at least one carbohydrate-active enzyme is added to the natural polymer after it has been converted to a liquid natural polymer.
  • Natural polymers for example starch, can be converted to liquid natural polymers using any suitable process, including but not limited to means of chemical (e.g . etherification, acetylation, propylation, phosphating, ethylation, acidulation, oxidation, enzymatic), physical and/or mechanical conversion to obtain the natural polymer in liquid form.
  • the manner in which the at least one carbohydrate-active enzyme is added to the polymer depends on the liquefaction process as the enzyme is added at an appropriate time to ensure the enzyme remains functional within the enzyme/liquid natural polymer mixture. Considerations include for example, but are not limited to, whether the at least one carbohydrate-active polymer will withstand the pH, temperature, pressure, sheer, or any combination thereof used during the liquefaction process. In one aspect the at least one carbohydrate-active enzyme is added to the liquid natural polymer after it is converted from a natural polymer.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are added to a pulp slurry prior to refining the treated pulp slurry.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are added to a pulp slurry in the pulper of a non-integrated paper mill, or a stock tower or equivalent storage vessel, in an integrated paper mill.
  • the pulp slurry is pre-incubated before addition of the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent for between 1 minute and 1 hour, or between 10 minutes and 40 minutes or between 15 minutes and 30 minutes.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent may be applied to a pulp slurry and allowed to react with the pulp slurry for sufficient time to improve at least one property of the pulp slurry for making paper or board, or between 1 minute and 6 hours, or between 10 minutes and 5 hours, or between 20 minutes and 4 hours or between 30 minutes and 3 hours, or between 40 minutes and 2 hours or between 40 minutes and 1 hour, wherein the pulp slurry optionally has been preheated to 50 - 70 °C such as to about 60 °C prior to the addition of the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent.
  • reaction between the mixture of the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent and the pulp slurry is stopped by inactivating the enzyme by for example, adjusting the temperature of the treated pulp slurry or adjusting the pH of the treated pulp slurry.
  • the enzyme in the treated slurry is inactivated by adding sodium hypochlorite.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are applied to a pulp slurry at the same time or sequentially within between 1 second to 6 hours to allow interaction between the carbohydrate-active enzyme(s), liquid natural polymer(s) and pulp prior to refining the treated pulp slurry.
  • the at least one enzyme, at least one liquid natural polymer, and optionally at least one strength agent are added sequentially within one hour of each other, such as within between 1 second and five minutes of each other.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are combined as a mixture, and then added together in a common composition to the pulp slurry.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent may be mixed in an addition pipeline or other feedline that feeds the resulting mixture to an introduction port, such as a port on a pulp processing unit or prior to the suction side of a pump between units.
  • the at least one carbohydrate-active enzyme, the at least one liquid natural polymer, and optionally at least one strength agent are combined into a single suspension before being added to the pulp slurry.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are added simultaneously to the pulp from different, separated introduction ports on the same processing unit.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent are introduced sequentially as one or more addition streams from the same or different introduction ports or locations on the papermaking system within a short period of time.
  • the at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent components are separately added in time with both components brought into contact with the pulp within the pulp slurry within a short period of time, for example, within about 5 minutes of each other, or within about 4 minutes of each other, or within about 3 minutes of each other, or within about 2 minutes of each other, or within about 1 minute of each other, or within about 30 seconds of each other, or within shorter periods of time.
  • the resulting treated pulp slurry may be further processed, for example by refining, and employed in the formation of paper or board.
  • the mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength ingredient is added to the pulp slurry at a temperature between about 30 degrees and about 80 degrees centigrade, or between about 40 degrees and about 70 degrees centigrade or between about 50 degrees and about 60 degrees centigrade.
  • the mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength ingredient is added to the pulp slurry at pH between about 4.0 and about 10, or between about 5.0 and about 9.0 or between about 6.0 and about 8.0.
  • the at least one liquid natural polymer is added to the pulp slurry or to the mixture comprising the at least one carbohydrate-active enzyme and the optional at least one strength additive in an amount between 0.01 % and 5.0% by weight of the pulp being treated, or between 0.05% and 2.0% by weight of the pulp being treated or between 0.10% and 2.0% by weight of the pulp being treated or between 0.10% and 1.0% by weight of the pulp being treated, or about 0.5% by weight of the pulp being treated.
  • the at least one carbohydrate-active enzyme is added to the pulp slurry or to the mixture of the at least one liquid natural polymer and the optional strength agent in an amount between 25 g and 200 g per metric ton of dry fiber or between 0.005% and 0.1 % of dry fiber.
  • the pulp slurries may have various concentrations, but in embodiments the pulp slurry comprises between 1 % and 20% fiber, or between 5% and 15% fiber, or about 10% fiber.
  • pulp slurries may use various suspension liquids, such liquids may vary over pH as described above.
  • the suspension fluid is deionized water, which has a pH between pH 6.0 and 8.0.
  • the suspension fluid is mill process water such as e.g.
  • the treated pulp slurry is refined to reduce its freeness.
  • the freeness as measured by a freeness tester (for example as available from TAPPI T est Method T 227 om-99,“Freeness of pulp (Canadian standard method)”), is between 20 ml and 890 ml, and all subranges within.
  • the refined, treated pulp slurry increases the tensile strength of the paper or board product.
  • the tensile strength of the product as measured by tensile testing machine (for example as available from TAPPI T 494,“Tensile Breaking Properties of Paper and Paperboard (Using Constant Rate of Elongation Apparatus)”) is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g, or between 40 and 70 Nm/g, or between about 45 Nm/g and 65 Nm/g, and all subranges within.
  • the tensile strength of the paper or board product varies with the amount of refining of the treated pulp slurry.
  • the tensile strength is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g, or between 40 and 70 Nm/g, or between about 45 Nm/g and 65 Nm/g over a range of 0 to 1600 revolutions of a PFI mill.
  • the combined pre-treatment with at the least one liquid natural polymer and the at least one carbohydrate-active enzyme surprisingly provided an advantage in terms of handsheet strengthening relative to the control and either component added alone.
  • the combined application of the at least one liquid natural polymer and the at least one carbohydrate-active enzyme added to the pulp slurry prior to refining also provided greater tensile strength while delivering greater freeness than the control or either component when added alone, as shown in Figure 4.
  • the tensile strength index is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g or between 40 and 70 Nm/g or between about 45 Nm/g and 65 Nm/g over a freeness range of between 390 ml and 490 ml.
  • the refined, treated pulp slurry increases or preserves the bulk of the paper or board product relative to paper or board products prepared after carbohydrate enzyme treatment alone.
  • the paper or board product is a standard handsheet.
  • the bulk is calculated by dividing the thickness of a sheet by its basis weight is between 0.1 cm 3 /g and 2.0 cm 3 /g, and all subranges within.
  • this result is unexpected as cellulases are known to improve the tensile strength of paper or board products, such as e.g. standard handsheets, at the expense of bulk. But, when applied in concert the cellulose and liquid natural polymer surprisingly mitigated the loss of bulk, as shown in Figure 5.
  • the bulk of paper or board products, such as e.g. standard handsheets, using the treated pulp slurry is within 7.5% of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining, or within 7% of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining, or within 6.5% of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining, or within 6% of the same paper or board products, such as e.g.
  • standard handsheets using untreated pulp slurry at the same level of refining, or within 5.5% of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining, or within 5% of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining, or within between about 7.5% and 0.1 % of the same paper or board products, such as e.g. standard handsheets, using untreated pulp slurry at the same level of refining.
  • pretreatment with the blend of liquid natural polymer and cellulase provided higher tensile strength and higher bulk in resultant handsheets prepared from the refined, treated pulp slurry, as shown in Figure 6.
  • the paper or board product will have a bulk of between 0.25 cm 3 /g and 0.35 cm 3 /g or between 0.28 cm 3 /g and 0.34 cm 3 /g, or between 0.29 cm 3 /g and 0.33 cm 3 /g while having a tensile strength of between 45 Nm/g and 65 Nm/g.
  • paper or board products made using the treated and refined pulp slurry have a higher burst strength index at the same level of refining.
  • the burst strength index of handsheets made from refined, treated pulp is between about 3 and about 3.5 kPa m 2 /g.
  • the method described herein may be practiced within conventional papermaking operations with modifications that may be easily made in view of the present disclosure.
  • the method may be practiced, for example, in wet end operations before the refiner as part of conventional papermaking operations with modifications that may be easily made in view of the present disclosure.
  • the method may employ many different types of papermaking pulp or combinations thereof.
  • the method may be practiced to make of any grade for example, including, but not limited to printing and writing paper, medium grade paper, paperboard, linerboard, tissue paper, towel paper and moulded packaging.
  • This specification further discloses a method of making a pulp or pulp slurry, comprising:
  • This specification further discloses a method of making a pulp or pulp slurry, comprising: introducing at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a pulp or pulp slurry prior to or after refining to obtain a refined, treated pulp or pulp slurry.
  • This specification further discloses a mixture comprising a carbohydrate-active enzyme, at least one liquid natural polymer, and optionally a strength agent.
  • the mixture is made by the process of mixing at least one carbohydrate-active enzyme, at least one liquid natural polymer and optionally at least one strengthening agent.
  • the mixture is made by the further process of contacting the at least one carbohydrate-active enzyme and at least one liquid natural polymer.
  • the carbohydrate active enzyme from the CAZy database i.e. a database of Carbohydrate- Active enzymes (also called CAZymes) known to the person skilled in the art and e.g. described by Lombard, V. et al. in "The carbohydrate-active enzymes database (CAZy) in 2013". Nucleic Acids Research, 42 (D1): D490-D495.
  • the at least one carbohydrate-active enzyme is a cellulase.
  • the at least one carbohydrate- active enzyme is an endoglucanase.
  • the at least one carbohydrate-active enzyme is a GH45.
  • the at least one carbohydrate-active enzyme has an amino acid sequence which is at least 80%, 85%, 90%, 95% or 99% identical to SEQ ID No: 1.
  • the at least one carbohydrate-active enzyme has the amino acid sequence of SEQ ID No: 1 or has an amino acid sequence with up to 10, such as 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10, amino acid changes compared to SEQ ID No: 1.
  • the at least one carbohydrate-active enzyme has an amino acid sequence which is at least 80%, 85%, 90%, 95% or 99% identical to SEQ ID No: 2.
  • the at least one carbohydrate-active enzyme has the amino acid sequence of SEQ ID No: 2 or has an amino acid sequence with up to 10, such as 1 , 2, 3, 4, 5, 6, 7, 8, 9 or 10, amino acid changes compared to SEQ ID No: 2.
  • the starch may be derived from corn, waxy maize, cassava, waxy cassava, wheat, potato, rice and pea (or other pulse source, including but not limited to fava bean or lentil), as well as other high amylose or low amylose variants of the vegetal source where a low amylose sources comprises no more than 10% amylose, or less than 5% amylose, or less than 3% amylose, or essentially no amylose (about 0%), and where high amylose sources comprise at least 40% amylose, or at least 50% amylose or at least 60% amylose, or at least 70% amylose, or between about 40% and 80% amylose.
  • the liquid natural polymer is derived from a waxy starch.
  • the liquid natural polymer is derived from a waxy corn starch.
  • the strength agents that optionally may be used in the mixture include but are not limited to natural or synthetic additives employed to improve fiber bonding.
  • such agents include, but are not limited to, carboxymethyl cellulose (CMC), glyoxalated polyacrylamide (GPAM), polyamide-epichlorohydrin (PAE), polyaminoamide-epichlorohydrin (PAAE), cationic polyacrylamide (CPAM), anionic polyacrylamide (APAM), amphoteric polyacrylamide, urea- formaldehyde (UF) and melamineformaldehyde (MF).
  • CMC carboxymethyl cellulose
  • GPAM glyoxalated polyacrylamide
  • PAE polyamide-epichlorohydrin
  • PAAE polyaminoamide-epichlorohydrin
  • CPAM cationic polyacrylamide
  • APAM anionic polyacrylamide
  • amphoteric polyacrylamide amphoteric polyacrylamide
  • UF formaldehyde
  • MF
  • the specification discloses a treated pulp slurry, and a refined, treated pulp slurry.
  • a treated pulp slurry made by the process of introducing into a pulp slurry prior to refining a mixture comprising at least one carbohydrate- active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a once-dried or never-dried pulp slurry prior to refining, and reacting the mixture with the pulp slurry for sufficient time to improve at least one property of the pulp slurry for use in making paper.
  • the refined, treated pulp slurry made according to the foregoing process has a freeness of between 20 ml and 890 ml, and all subranges within.
  • the mixture comprised of at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent is used to make a refined, treated pulp slurry that increases the tensile strength of the paper or board product.
  • the tensile strength index of the product as measured by a tensile testing machine, is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g, or between 40 and 70 Nm/g, or between about 45 Nm/g and 65 Nm/g, and all subranges within.
  • the tensile strength index of the paper or board product varies with the amount of refining of the treated pulp slurry.
  • the tensile strength is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g, or between 40 and 70 Nm/g, or between about 45 Nm/g and 65 Nm/g over a range of 0 to 1600 revolutions of a PFI mill.
  • the pre-treatment of the pulp slurry with the mixture comprising the at least one carbohydrate-active enzyme and the least one liquid natural polymer surprisingly provided an advantage in terms of handsheet strengthening relative to the control and either component added alone.
  • the combined application of the at least one liquid natural polymer and the at least one carbohydrate-active enzyme added to the pulp slurry prior to refining also provided greater tensile strength while delivering greater freeness than the control or either component when added alone, as shown in Figure 4.
  • the tensile strength index is between 10 Nm/g and 100 Nm/g, or between 20 Nm/g and 80 Nm/g or between 40 and 70 Nm/g or between about 45 Nm/g and 65 Nm/g over a freeness range of between 390 ml and 490 ml.
  • the mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent is used to increase or preserve the bulk of the paper or board products relative to paper or board products prepared after carbohydrate enzyme treatment alone.
  • the paper or board product is a standard handsheet.
  • the bulk is calculated by dividing the thickness of a sheet by its basis weight. In embodiments the bulk of the paper or board product is between 0.1 cm 3 /g and 2.0 cm 3 /g and all subranges within. In still another aspect, this result is unexpected as cellulases are known to improve the tensile strength of paper or board products at the expense of bulk.
  • the bulk of paper or board products such as e.g. standard handsheets using the treated pulp slurry is within 7.5% of the same paper or board products, such as e.g. standard handsheets using untreated pulp slurry at the same level of refining, or within 7% of the same paper or board products, such as e.g. standard handsheets using untreated pulp slurry at the same level of refining, or within 6.5% of the same paper or board products, such as e.g.
  • pretreatment with the blend of liquid natural polymer and cellulase provided higher tensile strength at higher bulk in resultant handsheets prepared from the refined fiber, as shown in Figure 6.
  • the paper or board products such as e.g. standard handsheets will have a bulk of between 0.25 cm 3 /g and 0.35 cm 3 /g or between 0.28 cm 3/ g and 0.34 cm 3 /g, or between 0.29 cm 3 /g and 0.33 cm 3 /g while having a tensile strength of between 45 Nm/g and 65 Nm/g.
  • Pulps and pulp slurries used in accordance with aspects of the disclosure may comprise virgin and/or recovered fibers. Any nonwood, softwood or hardwood fiber typically used in the paper industry may be employed, including, but not limited to bleached and unbleached chemical pulp.
  • a method of making paper or board comprising: a) introducing at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent to a once-dried or never-dried pulp slurry prior to refining,
  • the treated pulp slurry is refined to a target property selected from the group consisting of: reduced freeness of the refined, treated pulp slurry, increased tensile strength of the paper or board product, increased structural property of the paper or board product, decreased energy required during refining to meet a tensile strength target of a paper or board product, and a combination thereof.
  • tensile strength is a tensile strength index, which is measured according to TAPPI test method T 220 sp-16, and is between 10 Nm/g and 100 Nm/g.
  • the at least one strength agent is selected from the group consisting of: carboxymethyl cellulose (CMC), Glyoxalated Polyacrylamide (GPAM), Polyamide-Epichlorohydrin (PAE), Polyaminoamide-Epichlorohydrin (PAAE), Cationic Polyacrylamide (CPAM), Anionic Polyacrylamide (APAM), Amphoteric Polyacrylamide, Urea-Formaldehyde (UF) and Melamineformaldehyde (MF).
  • CMC carboxymethyl cellulose
  • GPAM Glyoxalated Polyacrylamide
  • PAE Polyamide-Epichlorohydrin
  • PAAE Polyaminoamide-Epichlorohydrin
  • CPAM Cationic Polyacrylamide
  • APAM Anionic Polyacrylamide
  • Amphoteric Polyacrylamide Amphoteric Polyacrylamide
  • Urea-Formaldehyde (UF) and Melamineformaldehyde (MF) Melamineformaldehyde
  • liquid natural polymer is derived from a waxy corn starch.
  • the endoglucanase has an amino acid sequence which is at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, or at least 95% identical to the amino acid sequence of SEQ ID No: 1 or SEQ ID No: 2.
  • endoglucanase has an amino acid sequence which is at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, or at least 95% identical to the amino acid sequence of SEQ ID No: 2.
  • amino acid changes are conservative amino acid substitutions or insertions that do not significantly affect the folding and/or activity of the endoglucanase.
  • liquid natural polymer is in a dose from 0.01 % to 5.0% - such as about 0.5% - of the weight of the total dry solids in the pulp being treated.
  • liquid natural polymer is in a dose from 0.05% to 2.0% of the weight of the total dry solids in the pulp being treated.
  • liquid natural polymer is in a dose from 0.10% to 2.0% of the weight of the total dry solids in the pulp being treated.
  • the fiber is selected from the group consisting of Bleached eucalyptus kraft (BEK) fiber, Bleached acacia kraft (BAK) fiber, Bleached hardwood kraft (BHK) fiber Unbleached hardwood kraft (UHK) fiber, Northern bleached softwood kraft (NBSK) fiber, Southern bleached softwood kraft (SBSK) fiber Unbleached softwood kraft (UBSK) fiber, Old corrugated container (OCC), Mixed office waste (MOW), Deinked pulp (DIP), and bleached and non-bleached non-wood fiber.
  • BEK Bleached eucalyptus kraft
  • BAK Bleached acacia kraft
  • BAK Bleached hardwood kraft
  • UHK Northern bleached softwood kraft
  • SBSK Southern bleached softwood kraft
  • USK Unbleached softwood kraft
  • OCC Old corrugated container
  • MOW Mixed office waste
  • DIP Deinked pulp
  • a method of improving at least one property of a pulp slurry for use in a paper or board mill wherein at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent is introduced to a once-dried or never-dried pulp slurry prior to refining in the paper or board mill thereby making a treated pulp slurry having at least one improved property.
  • the improved property is one or more properties selected from the group consisting of: reducing freeness of the refined, treated pulp slurry, increasing the tensile strength of the paper or board product made from the treated pulp slurry, increasing the structural property of the paper or board product made from the treated pulp slurry, decreasing the energy required during refining to meet a tensile strength target of a paper or board product, and a combination thereof.
  • the at least one strength agent is selected from the group consisting of: carboxymethyl cellulose (CMC), Glyoxalated Polyacrylamide (GPAM), Polyamide-Epichlorohydrin (PAE), Polyaminoamide-Epichlorohydrin (PAAE), Cationic Polyacrylamide (CPAM), Anionic Polyacrylamide (APAM), Amphoteric Polyacrylamide, Urea-Formaldehyde (UF) and Melamineformaldehyde (MF).
  • CMC carboxymethyl cellulose
  • GPAM Glyoxalated Polyacrylamide
  • PAE Polyamide-Epichlorohydrin
  • PAAE Polyaminoamide-Epichlorohydrin
  • CPAM Cationic Polyacrylamide
  • APAM Anionic Polyacrylamide
  • Amphoteric Polyacrylamide Amphoteric Polyacrylamide, Urea-Formaldehyde (UF) and Melamineformaldehyde (MF).
  • liquid natural polymer is derived from a waxy starch.
  • liquid natural polymer is derived from a waxy corn starch.
  • liquid natural polymer is in a dose from 0.10% to 2.0% of the weight of the total dry solids in the pulp being treated.
  • pulp, paper or board is selected from the group consisting of: printing paper, writing paper, corrugating medium, linerboard (kraft and test), tissue, towel, and boxboard.
  • a mixture comprising at least one carbohydrate-active enzyme and at least one liquid natural polymer, and optionally a strength agent.
  • a mixture for use in making paper or board comprising at least one carbohydrate-active enzyme and at least one liquid natural polymer, and optionally a strength agent. 1 12.
  • Example 1 Pretreatment of cellulosic fiber with a combination of liquid natural polymer and enzyme
  • Example 2 Pre-refiner pretreatment of cellulosic fiber with a combination of liquid natural polymer and enzyme
  • pulp slurries were prepared by diluting 24 grams of oven dry equivalents of never-dried bleached eucalyptus kraft fiber to 10% w/w consistency with deionized water. The resultant pulp slurries (pH 7.8) were then pre-incubated separately for 20 minutes at 40°C. After pre-incubation, the pulp slurry was divided into one group of four and three groups of three. The first group of four served as the untreated control group (labelled“Control”). The first group of 3 slurries (labelled “LNP”), were treated with a liquefied waxy corn starch (Ingredion, Westchester, Illinois).
  • the second group of 3 slurries were treated with cellulase A of SEQ ID No: 1 from Novozymes (Bagsvaerd, Denmark) (labelled“Cellulase A”).
  • the third group of 3 slurries was treated with both the Cellulase A and the liquefied waxy corn starch (labelled“LNP + Cellulase A”).
  • formulated liquefied waxy corn starch was added to deliver 5 kg of dry waxy corn starch per metric ton of oven dry bleached eucalyptus kraft fiber.
  • formulated Cellulase A of SEQ ID No: 1 was added to deliver 100 g of formulated cellulase per metric ton of oven dry fiber. All pulps were incubated for 60 min at 40°C and pH 7.8 within a kettle reactor immersed in a water bath. Continuous agitation was provided by an impeller.
  • Pulp pads were prepared by vacuum filtration. The filtrate was passed once back across the pad to capture small materials (e.g. fragmented fibers and fines). Filtrates from each pulp were used to dilute the respective pads to 10% w/w consistency. Pulps from the control and each group of pre-treatments were subjected to 0, 500 & 1500 revolutions of beating within a standard PFI mill operating with 0.2 mm gap and a load of 1765 N/mm of bar length. Subsequently, the pulps were diluted to 0.3% consistency for freeness determinations according to TAPPI standard T 227 om- 99. Each slurry was used to prepare six 1.2 g (60 g/m 2 ) handsheets according to TAPPI standard T 205. Physical testing (e.g. Tensile and burst strength indices) was performed according to the respective TAPPI standard procedures.
  • liquid natural polymer and cellulase prior to refining also provided the greatest tensile strength while delivering greater freeness than the control or either component when added alone (see Figure 4).
  • Cellulases are known to improve the tensile strength of paper or board products, such as e.g. standard handsheet at the expense of bulk. When applied in concert with cellulase, liquid natural polymer surprisingly mitigated the loss of bulk (see Figure 5). Furthermore, pretreatment with the blend of liquid natural polymer and cellulase provided higher tensile at higher bulk in resultant handsheets prepared from the refined fiber (see Figure 6).
  • Example 3 Pretreatment of cellulosic fiber with a combination of liquid natural polymer and enzyme
  • the formulated liquid natural polymer was added to deliver 7.5 kg of starch solids per metric ton of oven dry fiber.
  • formulated cellulase of SEQ ID No: 1 was added to deliver 150 g of formulated cellulase per metric ton of oven dry fiber. All pulps were incubated for 30 min at 40°C and pH 6.8 within a kettle reactor immersed in a water bath. Continuous agitation was provided by an impeller.
  • Example 4 Pretreatment of cellulosic fiber with a combination of liquid natural polymer and enzyme
  • formulated liquid natural polymer was added to deliver 7.5 kg of starch solids per metric ton of oven dry fiber.
  • formulated cellulase of SEQ I D No: 1 was added to deliver 150 g of formulated cellulase per metric ton of oven dry fiber. All pulps were incubated for 30 min at 40°C and pH 6.8 within a kettle reactor immersed in a water bath. Continuous agitation was provided by an impeller.
  • BSKP bleached softwood kraft pulp
  • the BSKP sample was concentrated to 10% w/w consistency and refined using a PFI refiner according to the conditions in Table 3.
  • the BSKP sample was diluted to 1.2% w/w consistency for disintegration and further diluted to 0.3% w/w consistency.
  • Each BEKP (0.3% w/w consistency) was blended with refined BSKP (0.3% w/w consistency) at the ratio of 1/1 (w/w) and used to prepare six 1.2 g (60 g/m 2 ) handsheets according to TAPPI standard T 205.
  • Physical testing e.g. tensile and burst strength indices was performed according to the respective TAPPI standard procedures.

Abstract

L'invention concerne un mélange comprenant au moins une enzyme active sur les glucides, au moins un polymère naturel liquide, et éventuellement au moins un agent de renforcement. Le mélange est utile dans des procédés de fabrication de papier ou de carton et des procédés d'amélioration de l'aptitude au raffinage et/ou du potentiel de renforcement de la pâte à papier destinée à être utilisée dans une usine à papier ou à carton. Dans de tels procédés, le mélange est ajouté à un matériau cellulosique contenant une pâte à papier liquide lors du processus de fabrication des produits en papier ou en carton.
PCT/US2019/041190 2018-07-10 2019-07-10 Procédé de fabrication de papier ou de carton WO2020014351A1 (fr)

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CA3102221A CA3102221A1 (fr) 2018-07-10 2019-07-10 Procede de fabrication de papier ou de carton
CN201980044039.4A CN112601859A (zh) 2018-07-10 2019-07-10 制造纸张或纸板的方法
MX2021000113A MX2021000113A (es) 2018-07-10 2019-07-10 Metodo de fabricacion de papel o carton.
EP19745529.8A EP3821073A1 (fr) 2018-07-10 2019-07-10 Procédé de fabrication de papier ou de carton
US17/258,290 US20210269972A1 (en) 2018-07-10 2019-07-10 Method of making paper or board
BR112021000294-4A BR112021000294A2 (pt) 2018-07-10 2019-07-10 Métodos de produção de papel ou cartão, de melhoria de pelo menos uma propriedade de uma pasta semifluida de polpa para uso em um moinho de papel ou cartão, de produção de uma polpa ou pasta semifluida de polpa, de produção de papel ou cartão ou para produção de uma polpa ou pasta semifluida de polpa, polpa ou pasta semifluida de polpa tratada, produto de papel ou cartão produzido usando a pasta semifluida de polpa tratada, e, mistura

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US20210269972A1 (en) 2021-09-02
CL2021000014A1 (es) 2021-09-24
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