WO2021148662A1 - Product containing an anionic cellulose derivative and its use in paper industry - Google Patents
Product containing an anionic cellulose derivative and its use in paper industry Download PDFInfo
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- WO2021148662A1 WO2021148662A1 PCT/EP2021/051536 EP2021051536W WO2021148662A1 WO 2021148662 A1 WO2021148662 A1 WO 2021148662A1 EP 2021051536 W EP2021051536 W EP 2021051536W WO 2021148662 A1 WO2021148662 A1 WO 2021148662A1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
- 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
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
- D21H17/375—Poly(meth)acrylamide
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
- D21H17/45—Nitrogen-containing groups
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
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- 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
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
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- 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
- D21H21/20—Wet strength agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
Definitions
- the present invention relates to the field of paper industry, particularly, paper making.
- Paper is usually produced from pulp, which is a lignocellulosic fibrous material obtained from wood or non-wood material (e.g. cotton, bagasse, etc.). Wood pulp is separated into two main categories: either hardwood pulp or softwood pulp. Hardwood is wood from angiosperm trees (e.g. birch, eucalyptus), whereas softwood is wood from gymnosperm trees (conifers, e.g. spruce, pine). On average, softwood fibers are more than three times the length of hardwood fibers; this is why pulp obtained from softwood is called “long fiber pulp” and pulp obtained from hardwood is called “short fiber pulp”. As an increased fiber length usually provides more inter-fiber bonding, softwood pulp usually leads to products having a higher strength than products obtained from hardwood pulp.
- pulp is a lignocellulosic fibrous material obtained from wood or non-wood material (e.g. cotton, bagasse, etc.). Wood pulp is separated into two main categories: either hardwood pulp or softwood pulp. Hardwood is
- pulp is provided and may be refined and mixed with water to provide an aqueous pulp mixture (or pulp furnish), which can contain manufacture additives.
- the aqueous pulp mixture may be provided as a wet web, water is then drained from the web, which provides a wet paper sheet. The wet paper sheet is then pressed, dried, and finally rolled into large rolls.
- the initial wet web strength is a feature describing the strength of a paper sheet before drying.
- IWWS of a sheet is increased, the machines can be run at a higher speed, thus providing a significant industrial improvement.
- eucalyptus is beneficial in terms of costs, since eucalyptus is a fast growing tree that can be harvested after only 8 years.
- Dry tensile strength is indicative of the strength derived, notably, from fiber strength, fiber length, and bonding. It can be used as an indication of the potential resistance to web breaking of papers such as printing papers during printing on a sheet fed press, web fed press or other web fed converting operations.
- a starch derivative and an anionic cellulose derivative as additives during paper making thus allows the obtention of paper sheets having overall improved properties, in particular when used in a printing process.
- the invention thus relates to a product (or a kit) comprising: a microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65, as a combined preparation for simultaneous or separate use.
- kit-of-parts The product or kit according to the invention is a juxtaposition of separate but functionally interacting individual components: a microfibrillated cellulose composition, a starch derivative and a specific anionic cellulose derivative (“kit-of-parts”)
- microfibrillated cellulose composition a composition comprising cellulose microfibrils or cellulose microfibril bundles that are present in the cell walls of plants (including wood).
- the microfibrillated cellulose composition may originate from wood or from cellulose containing biomass, for example originating from agricultural crops which may have been processed such as agricultural wastes, by-products or secondary streams of processing streams.
- the cellulose containing agricultural biomass may originate from vegetables, fruits, grasses, buckwheat, members of the Fabeceae family, or combinations thereof.
- Microfibrillated cellulose may also be called interchangeably nanofibrillar cellulose (NFC), nanofibrillated cellulose, cellulose nanofiber, nano-scale fibrillated cellulose, microfibrillar cellulose or cellulose nanofibrils (CNF).
- NFC nanofibrillar cellulose
- CNF cellulose nanofibrils
- the microfibrils in the microfibrillated cellulose composition may have a length higher than or equal to 1 pm and a diameter comprised between 2 and 200 nm.
- the microfibril length is comprised between 1 and 200 pm, more preferably, between 10 and 100 pm, even more preferably, between 10 and 60 pm.
- the microfibril diameter is comprised between 2 and 100 m, more preferably, between 4 and 70 nm, even more preferably, between 5 and 40 nm.
- each bundle comprises between 10 and 50 microfibrils and has a diameter less than 1 pm.
- the microfibrillated cellulose composition may be extracted from a natural source, it may comprise other components than cellulose.
- the microfibrillated cellulose composition comprises at least 30 wt% of cellulose, preferably, between 50 and 99 wt% of cellulose, more preferably, between 60 and 90 wt% of cellulose, based on the dry weight of the microfibrillated cellulose composition.
- the microfibrillated cellulose composition is not soluble in water.
- the microfibrillated cellulose of the microfibrillated cellulose composition is not chemically and/physically modified.
- starch derivative it is intended starch constituted by amylose and amylopectin that may have been chemically modified by grafting identical or different chemical compounds via their hydroxyl groups.
- the starch derivative is derived from any suitable starch used in paper making, such as potato, rice, corn, waxy corn, wheat, barley or tapioca starch, preferably, wheat, corn or potato starch.
- the amylopectin content of the starch is comprised between 65 and 90 wt%, preferably between 70 and 85 wt%.
- At least 70 wt% of the starch units of the starch derivative have a number average molecular weight higher than 20000000 g/mol, preferably, higher than 50000000 g/mol, more preferably, higher than 100000000 g/mol.
- the starch derivative is a chemically-modified starch; more preferably, the starch derivative is cationic starch.
- the starch may be cationised by any suitable method.
- the cationic starch is obtained by using a quaternary ammonium compound, preferably (3- acrylamidopropyl)-trimethylammonium chloride, 2,3-epoxypropyl-trimethylammonium chloride or 3-chloro-2-hydroxypropyltrimethylammonium chloride, more preferably 2,3- epoxypropyltrimethylammonium chloride.
- the cationic starch has a degree of substitution comprised between 0.01-0.3, preferably 0.02-0.1 , more preferably 0.03-0.06, where the degree of substitution indicates the number of cationic groups of the starch on average per glucose unit.
- the cationic starch is non-degraded, which means that the starch has been modified solely by cationisation, and its backbone is non-degraded and non-cross- linked.
- degradation processes are, for example, oxidation and acid-thinning.
- anionic cellulose derivative it is intended cellulose which is chemically modified by substitution of some hydrogens of the hydroxyl groups with carboxymethyl groups under their anionic form (i.e. some of the -OH groups are modified to -OCH2COO groups).
- the anionic cellulose derivative is different from sodium carboxymethylcellulose (CMC) due to its higher molecular weight and its lower degree of substitution, the degree of substitution indicating the number of carboxymethyl groups of the cellulose on average per glucose unit.
- CMC sodium carboxymethylcellulose
- CMC has a number average molecular weight typically comprised between 70000 g/mol and 100000 g/mol for uses in paper industry, and a degree of substitution which is at least 0.6, typically over 0.7 for uses in paper industry.
- the anionic cellulose derivative has a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65.
- the anionic cellulose derivative has a number average molecular weight comprised between 400000 g/mol and 700000 g/mol, more preferably, between 450000 g/mol and 650000 g/mol, even more preferably, between 450000 g/mol and 600000 g/mol.
- the degree of substitution of the anionic cellulose derivative is comprised between 0.4 and 0.5, more preferably between 0.45 and 0.5.
- the anionic cellulose derivative has a number average molecular weight comprised between 450000 g/mol and 600000 g/mol and a degree of substitution comprised between 0.45 and 0.5.
- the number average molecular weight of the anionic cellulose derivative may be calculated using the degree of polymerization (DP) and the degree of substitution (DS) thereof determined by methods known to a person skilled in the art, and the approximative number average molecular weight of the anionic cellulose derivative can be calculated from:
- DP x (162 + 81 x DS), wherein DP is degree of polymerization and DS is degree of substitution.
- microfibrillated cellulose composition, the starch derivative and the specific anionic cellulose derivative of the product or kit according to the invention can be used or introduced simultaneously or separately, such as sequentially, in a process such as a paper making process.
- the product according to the invention can be used in an aqueous pulp mixture together with additives which are usual in the field, as defined below.
- additives such as a retention system e.g. a cationic retention polymer (e.g. natural and/or synthetic cationic polymer), retention chemicals (e.g. silica sol or bentonite), etc.
- the invention also relates to an admixture composition comprising: an aqueous pulp mixture, and a microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65.
- aqueous pulp mixture it is intended a mixture comprising water and pulp, preferably, a mixture consisting of water and pulp.
- Pulp it is meant a fibrous cellulosic material, originating from softwood, hardwood or non-wood sources, such as bamboo or kenaf or mixtures thereof.
- the fibrous material comprises hardwood or softwood originating fibrous material.
- Pulp may be cellulosic fiber material and may originate from any suitable mechanical, semi mechanical or chemical pulping process or any of their combinations or any other suitable pulping process known as such. Such pulps may be bleached or unbleached pulps.
- the cellulosic fiber material may also comprise fiber material which originates from recycled board, paper or pulp.
- cellulosic fiber material may comprise cellulosic fibers that originate from hardwood and have a length of 0.5 - 1.5 mm (“short fibers”) and/or softwood and have a length of 2.0 - 7.5 mm such as 2.5 - 7.5 mm (“long fibers”). Often the length of softwood fibers is in the magnitude of three times the length of hardwood fibers.
- the pulp is wood pulp, more preferably, the pulp is hardwood pulp such as eucalyptus, beech, birch, maple, willow and rose apple pulp, even more preferably, eucalyptus or birch pulp.
- the aqueous pulp mixture comprises at least 80 wt% of short fibers, relative to the total weight of fibers.
- short fibers are hardwood fibers (fibers from e.g. birch, eucalyptus).
- the average fiber length in hardwood chemical pulp is typically 0.5 mm - 1.5 mm (“short fiber”), and the average fiber length in softwood chemical pulp is typically 2.0 mm - 5.0 mm (“long fiber”).
- the rest of the aqueous pulp mixture comprises preferably long fibers, more preferably softwood fibers (conifers), relative to the total weight of fibers.
- Softwood pulp can be, for example, pine or spruce pulp.
- the aqueous pulp mixture of the admixture composition comprises at least 90 wt% of short fibers, more preferably, 100 wt% of short fibers, relative to the total weight of fibers.
- the aqueous pulp mixture has a solid content of less than 3 wt% based on the total weight of the aqueous pulp mixture, preferably, less than 2 wt%, more preferably, less than 1 wt%, such as for example, 0.5 wt%.
- microfibri Hated cellulose composition the starch derivative and/or the anionic cellulose derivative, as described above, also apply to the admixture composition.
- the m i crofi bri Mated cellulose of the microfibrillated cellulose composition is more preferably not chemically and/or physically modified, and/or the starch derivative is more preferably cationic starch, and/or the degree of substitution of the anionic cellulose derivative is comprised between 0.4 and 0.5, more preferably between 0.45 and 0.5.
- the admixture composition according to the invention further comprises at least one additive, which can be added to the aqueous pulp mixture, simultaneously or subsequent to the microfibrillated cellulose composition, the starch derivative and the anionic cellulose derivative which are described above.
- a retention system such as a cationic retention polymer can be added to the aqueous pulp mixture, for example, at least one natural and/or synthetic cationic polymer.
- the cationic retention polymer may be any suitable retention polymer, for example a cationic polyacrylamide (CPAM) having an average molecular weight of 4000000 to 18000000 Da, preferably 4000000-12000000 Da, more preferably 7000000-10000000 Da and/or a charge density of 0.2-2.5 meq/g, preferably 0.5-1.5 meq/g, more preferably 0.7- 1.2 meq/g.
- CPAM cationic polyacrylamide
- the charge density of the polymer may be determined at pH 7, and measured by titration with Mutec PCD instrument with PesNa.
- absolute value is herein to be interpreted as a real number x being the non-negative value of x without regard to its sign. E.g. the absolute value of 1 is 1, and the absolute value of -1 is also 1.
- retention chemicals such as silica particles or silica microparticles, e.g under the form of silica sol, or bentonite can be added to the aqueous pulp mixture.
- the silica sol may be added to the aqueous pulp mixture in an amount of about 0.01- 0.06 wt% silica/aqueous pulp mixture, such as about 0.02 - 0.06 wt%, or 0.03 to 0.05 wt%, based on the dry solid content of the silica sol relative to the dry solid content of the aqueous pulp mixture.
- the amount of microfibrillated cellulose composition in the admixture composition according to the invention is comprised between 0.3 wt% and 5 wt%, based on the dry solid content of the microfibrillated cellulose composition relative to the dry solid content of the aqueous pulp mixture.
- the amount of microfibrillated cellulose composition is comprised between 0.4 wt% and 3 wt%, more preferably between 0.5 wt% and 2 wt%, such as for example 1 wt%.
- the amount of starch derivative in the admixture composition according to the invention is comprised between 0.1 wt% and 2 wt%, based on the dry solid content of the starch derivative relative to the dry solid content of the aqueous pulp mixture.
- the amount of starch derivative is comprised between 0.3 wt% and 1.8 wt%, more preferably between 0.5 wt% and 1.5 wt%, such as for example 0.5 wt%.
- the amount of anionic cellulose derivative in the admixture composition according to the invention is comprised between 0.05 wt% and 0.3 wt%, based on the dry solid content of the anionic cellulose derivative relative to the dry solid content of the aqueous pulp mixture.
- the amount of anionic cellulose derivative is comprised between 0.05 wt% and 0.2 wt%, such as for example 0.2 wt%.
- the admixture composition according to the invention comprises: between 0.3 wt% and 5 wt% of a microfibrillated cellulose composition, based on the dry solid content of the microfibrillated cellulose composition relative to the dry solid content of the aqueous pulp mixture, between 0.1 wt% and 2 wt% of cationic starch, based on the dry solid content of the cationic starch relative to the dry solid content of the aqueous pulp mixture, and between 0.05 wt% and 0.3 wt% of an anionic cellulose derivative having a molecular weight comprised between 300 000 g/mol and 800 000 g/mol, and a degree of substitution comprised between 0.3 and 0.65, based on the dry solid content of the anionic cellulose derivative relative to the dry solid content of the aqueous pulp mixture.
- the microfibrillated cellulose in the m i crof i bri 11 ated cellulose composition is not chemically and/or
- the admixture composition according to the invention may further comprise a retention system, e.g. at least one retention polymer such as a cationic retention polymer, preferably a cationic polyacrylamide as defined above, and/or at least one other retention chemicals, such as microparticles, for example, silica and/or bentonite particles.
- the retention system may also comprise a second retention polymer, cationic or anionic, such as in addition to the cationic retention polymer and optionally the microparticles.
- the invention also relates to a process for preparing the admixture composition according to the invention, comprising: providing an aqueous pulp mixture, admixing to the aqueous pulp mixture: a microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65.
- the at least one cationic retention polymer and/or the at least one other retention chemical and/or additive usual in the technical field of paper making, as described above, is added to the aqueous pulp mixture.
- aqueous pulp mixture the microfibrillated cellulose composition, the starch derivative and/or the anionic cellulose derivative, as well as of the admixture composition, also apply to the process for preparing the admixture composition.
- the aqueous pulp mixture advantageously has a solid content of less than 3% based on the total weight of the aqueous pulp mixture.
- microfibrillated cellulose composition, the starch derivative, and the anionic cellulose derivative can be added simultaneously or sequentially, in either order, to the aqueous pulp mixture, either to the thin or thick stock.
- the anionic cellulose derivative and/or the microfibrillated cellulose composition can be added to the thick stock.
- the anionic cellulose derivative is added to the thick stock.
- thin stock typically has a solid content of less than 2 wt%, for example about 1 wt%, based on the total weight of the stock.
- thick stock typically has a solid content of about 3 to 4 wt%, based on the total weight of the stock.
- the anionic cellulose derivative, the starch derivative, the microfibrillated cellulose composition and the optional retention system e.g. the optional cationic polyacrylamide can be added sequentially according to this addition order.
- the invention relates to a paper product comprising a microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65.
- paper product it is intended, for example, fine papers, printing paper, toilet paper, tissues or packaging materials, or else paperboard
- the paper product is, for example, selected from fine papers, printing paper, toilet paper, tissues or packaging materials.
- microfibrillated cellulose composition the starch derivative, and the anionic cellulose derivative are as described above, including the embodiments.
- the paper product according to the invention is obtained from the aqueous pulp mixture as described above.
- the paper product according to the invention preferably comprises 80 wt% of short fibers, more preferably, 90 wt% of short fibers, even more preferably, 100 wt% of short fibers, relative to the total weight of fibers.
- the invention also relates to a process for preparing a paper product, comprising: providing an aqueous pulp mixture, admixing to the aqueous pulp mixture: a microfibrillated cellulose composition, a starch derivative and an anionic cellulose derivative, as described above, and optionally a retention system such as a cationic polyacrylamide, to form an admixture composition according to the invention, and forming a wet sheet by draining the admixture composition, wherein the anionic cellulose derivative has a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65.
- the process for preparing a paper product according to the invention further comprises: pressing the wet sheet, and drying the wet sheet.
- the anionic cellulose derivative is added to the aqueous pulp mixture at least 10 minutes, preferably at least 20 minutes, more preferably about 30 minutes before the wet sheet formation.
- This process for preparing the paper product according to the invention encompasses all the embodiments described for the admixture composition according to the invention and all general and preferred embodiments described above for the microfibri Hated cellulose composition, the starch derivative and the anionic cellulose derivative.
- this process for preparing a paper product according to the invention provides the paper product according to the invention as described above.
- the invention relates to the use of the product or kit according to the invention, as a strength additive for increasing the initial wet web strength and/or dry tensile strength of a paper sheet.
- the product according to the invention is used to improve runability of machines during the preparation of a paper product.
- the invention further relates to a product or kit comprising: a microfibri Hated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65, as defined above, in association, for joint use in a paper making process.
- joint use is meant the use of a microfibri Hated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65, as defined above, in order to obtain the desired properties of the paper product with respect to IWWS and/or dry tensile strength, the microfibrillated cellulose composition, a starch derivative, and an anionic cellulose derivative having a number average molecular weight comprised between 300000 g/mol and 800000 g/mol, and a degree of substitution comprised between 0.3 and 0.65, being capable of being introduced simultaneously or separately, such as sequentially, during the paper making process, preferably in the aqueous pulp mixture.
- Example 1 Evaluation of IWWS of hand sheets prepared from birch pulp 1.1 Pulping of birch furnish
- Birch pulp were refined with Voith Sulzer-refiner to a Schopper-Riegler (SR) value of 22, determined according to the method set forth in ISO 5267-1 Pulps - Determination of drainability - Part 1 : Schopper-Riegler method.
- the consistency (or solid content) of the disintegrated pulp was 3 wt%.
- the pulp was further diluted with water prior to sheet formation to a solid content of 0.5 wt% with respect to the total weight of the aqueous pulp mixture.
- the laboratory hand sheets were prepared with dynamic sheet former (TechPap). The chemicals were added to the pulp system in the following order:
- Anionic cellulose derivative ECA (Nouryon); chemically modified cellulose having anionic carboxymethyl substituents with a degree of substitution comprised between 0.45 and 0.5 and a number average molecular weight of about 500 000 g/mol.
- MFC microfibrillated cellulose composition
- Brookfield viscosity of a 1 wt% MFC aqueous solution is 0.106 Pa.s at 100 rpm, and 0.192 Pa.s at 50 rpm (a V75 vane spindle was used for the measurement)
- Cationic polyacrylamide Fennopol K3400 (Kemira Oyj)
- the normal delay time to add these chemicals is the following: cationic starch is added 30 s after ECA, MFC is added 60 s after ECA, CPAM is added 70 s after ECA and silica is added 80 s after ECA, the sheet formation occurring 90 s after the addition of ECA.
- the sheet average grammage was 100 g/m 2 .
- the sheets were placed between plotting papers and pressed with a lab nip press under 5 bar pressure. The pressing was repeated twice after which the sheets were cut in 15 mmx150 mm cross direction (CD) and machine direction (MD) pieces. The pieces were placed into a plastic minigrip bag to avoid changes in the solid content prior the initial wet web strength (IWWS) measurements.
- CD 15 mmx150 mm cross direction
- MD machine direction
- the solid content of the pressed sheets was measured with placing a sample into 150°C dryer for 10 minutes and measuring the weight loss of the dried paper pieces.
- Dry tensile strength was measured on dried sheets. Dry tensile strength was measured by using method ISO 1924-3.
- IWWS was measured with tensile strength measuring equipment similarly to the dry tensile strength, except that the sheets were not dried. Each test point measurement was repeated with 8 separate paper slices per machine direction and 6 per cross direction.
- compositions 5 and 6 are compositions according to the invention, whereas compositions 1-4 are comparative compositions.
- ECA was added either with normal delay time (90 seconds between addition of ECA and sheet formation) for compositions 1-5, or with long delay time (30 minutes between addition of ECA and sheet formation) for composition 6.
- composition 4 the birch sheets obtained from the compositions 5 and 6 according to the invention have the higher IWWS, while a combination of starch with either ECA (composition 4) or MFC (composition 3) leads to sheets having an IWWS less than sheets obtained with addition of starch only (composition 2).
- compositions 5 and 6 according to the invention show a significant increase of the dry tensile strength with respect to the reference sheet (composition 1).
- compositions according to the invention are able to highly increase the IWWS, as well as the dry tensile strength.
- Example 2 Evaluation of IWWS of hand sheets prepared from eucalyptus pulp
- Hand sheets were obtained according to point 1.2 of Example 1, except that eucalyptus pulp was used instead of birch pulp, and a different MFC was used.
- This MFC is a sugar beet originated MFC having a cellulose content of 69 wt%, based on dry solid content of the MFC, and a solid content of 7.7 wt%, based on the total weight of the MFC; the Brookfield viscosity of a 1% MFC aqueous solution is 0.940 Pa.s at 100 rpm, and 1.725 Pa.s at 50 rpm (a V75 vane spindle was used for the measurement).
- composition 15 is a composition according to the invention, whereas compositions 7-14 are comparative compositions.
- ECA was added with normal delay time (90 seconds between addition of ECA and sheet formation) for all compositions.
- the pulp was obtainec from a weight ratio of 90/10 eucalyptus/softwood (long fibers)
- composition 15 for a similar solid content, the sheet obtained from composition 15 according to the invention (comprising a combination of MFC, starch and ECA) has an increased IWWS, as well as an increased dry tensile strength, with respect to the reference eucalyptus sheet (composition 7).
- composition 15 reaches a value close to the comparative sheet made from 90/10 eucalyptus/softwood (composition 8), and has an increased dry tensile strength compared to this sheet (composition 8), resulting in better overall properties than the comparative sheet made from 90/10 eucalyptus/softwood.
- the eucalyptus sheets obtained from any one of the comparative compositions 9, 10, 12 do not combine both a high IWWS and a high dry tensile strength.
- the improvement in terms of both IWWS and dry tensile strength is not as high when CMC is used instead of ECA (comparison of compositions 10 and 11, and of compositions 14 and 15).
- composition according to the invention allows obtaining sheets from 100% eucalyptus pulp having an IWWS close to a sheet made from 90/10 eucalyptus/softwood (good runability), but also a better dry tensile strength (better handling properties) than said sheet.
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Abstract
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Priority Applications (7)
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CA3165198A CA3165198A1 (en) | 2020-01-22 | 2021-01-22 | Product containing an anionic cellulose derivative and its use in paper industry |
EP21701965.2A EP4093911A1 (en) | 2020-01-22 | 2021-01-22 | Product containing an anionic cellulose derivative and its use in paper industry |
KR1020227028469A KR20220125356A (en) | 2020-01-22 | 2021-01-22 | Products containing anionic cellulose derivatives and their use in the paper industry |
US17/794,618 US20230053998A1 (en) | 2020-01-22 | 2021-01-22 | Product containing an anionic cellulose derivative and its use in paper industry |
AU2021211153A AU2021211153A1 (en) | 2020-01-22 | 2021-01-22 | Product containing an anionic cellulose derivative and its use in paper industry |
CN202180010419.3A CN115349042A (en) | 2020-01-22 | 2021-01-22 | Product containing anionic cellulose derivatives and use thereof in the paper industry |
BR112022014498A BR112022014498A2 (en) | 2020-01-22 | 2021-01-22 | PRODUCT CONTAINING AN ANIONIC CELLULOSE DERIVATIVE AND ITS USE IN THE PAPER INDUSTRY |
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AU (1) | AU2021211153A1 (en) |
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Citations (6)
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WO2010092239A1 (en) * | 2009-02-13 | 2010-08-19 | Upm-Kymmene Oyj | A method for producing modified cellulose |
WO2012039668A1 (en) * | 2010-09-22 | 2012-03-29 | Stora Enso Oyj | A paper or paperboard product and a process for production of a paper or paperboard product |
EP2662419A1 (en) * | 2012-05-11 | 2013-11-13 | Omya International AG | Charge controlled PHCH |
WO2017103335A1 (en) * | 2015-12-15 | 2017-06-22 | Kemira Oyj | Method for producing paper, board or the like |
WO2018229333A1 (en) * | 2017-06-14 | 2018-12-20 | Kemira Oyj | Method for increasing the strength properties of a paper or board product |
WO2019123191A1 (en) * | 2017-12-19 | 2019-06-27 | Stora Enso Oyj | A method to produce a fibrous product comprising microfibrillated cellulose |
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CN110462132B (en) * | 2017-03-29 | 2022-08-05 | 凯米拉公司 | Method for producing paper, paperboard or the like |
CA3099514A1 (en) * | 2018-05-14 | 2019-11-21 | Kemira Oyj | Paper strength improving composition, manufacture thereof and use in paper making |
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2020
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- 2021-01-22 CN CN202180010419.3A patent/CN115349042A/en active Pending
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Patent Citations (6)
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WO2010092239A1 (en) * | 2009-02-13 | 2010-08-19 | Upm-Kymmene Oyj | A method for producing modified cellulose |
WO2012039668A1 (en) * | 2010-09-22 | 2012-03-29 | Stora Enso Oyj | A paper or paperboard product and a process for production of a paper or paperboard product |
EP2662419A1 (en) * | 2012-05-11 | 2013-11-13 | Omya International AG | Charge controlled PHCH |
WO2017103335A1 (en) * | 2015-12-15 | 2017-06-22 | Kemira Oyj | Method for producing paper, board or the like |
WO2018229333A1 (en) * | 2017-06-14 | 2018-12-20 | Kemira Oyj | Method for increasing the strength properties of a paper or board product |
WO2019123191A1 (en) * | 2017-12-19 | 2019-06-27 | Stora Enso Oyj | A method to produce a fibrous product comprising microfibrillated cellulose |
Non-Patent Citations (1)
Title |
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"Polymer Handbook", vol. 2, 1999, JOHN WILEY & SONS, INC |
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EP3854936A1 (en) | 2021-07-28 |
EP4093911A1 (en) | 2022-11-30 |
CA3165198A1 (en) | 2021-07-29 |
AU2021211153A1 (en) | 2022-08-25 |
US20230053998A1 (en) | 2023-02-23 |
CN115349042A (en) | 2022-11-15 |
KR20220125356A (en) | 2022-09-14 |
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