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EP4202119B1 - Papier recyclable à haute résistance à l'état humide - Google Patents

Papier recyclable à haute résistance à l'état humide

Info

Publication number
EP4202119B1
EP4202119B1 EP21217014.6A EP21217014A EP4202119B1 EP 4202119 B1 EP4202119 B1 EP 4202119B1 EP 21217014 A EP21217014 A EP 21217014A EP 4202119 B1 EP4202119 B1 EP 4202119B1
Authority
EP
European Patent Office
Prior art keywords
paper
tonne
dry
pam
iso
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21217014.6A
Other languages
German (de)
English (en)
Other versions
EP4202119B8 (fr
EP4202119A1 (fr
Inventor
Karin ATHLEY
Lars WAHLSTRÖM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Billerud AB
Original Assignee
Billerud AB
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 Billerud AB filed Critical Billerud AB
Priority to EP21217014.6A priority Critical patent/EP4202119B8/fr
Priority to EP22703919.5A priority patent/EP4288603A1/fr
Priority to US18/274,678 priority patent/US20240110337A1/en
Priority to PCT/EP2022/052384 priority patent/WO2022167437A1/fr
Priority to CA3205747A priority patent/CA3205747A1/fr
Priority to US18/723,175 priority patent/US20250052008A1/en
Priority to CN202280083098.4A priority patent/CN118414461A/zh
Priority to PCT/EP2022/087656 priority patent/WO2023118535A1/fr
Priority to EP22844479.0A priority patent/EP4453313A1/fr
Publication of EP4202119A1 publication Critical patent/EP4202119A1/fr
Priority to ZA2023/08329A priority patent/ZA202308329B/en
Application granted granted Critical
Publication of EP4202119B1 publication Critical patent/EP4202119B1/fr
Publication of EP4202119B8 publication Critical patent/EP4202119B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • 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
    • D21H17/33—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
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/52—Epoxy resins
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/56—Polyamines; Polyimines; Polyester-imides
    • 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
    • D21H17/72—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—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
    • 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
    • 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
    • D21H27/10—Packing paper

Definitions

  • the present disclosure relates to the field of paper and in particular recyclable paper having relatively high wet strength.
  • US 54 27 652 discloses a repulpable wet strength paper board formed from a dispersion of cellulosic fibers treated with a glyoxylated vinylamide in combination with a wet strength agent.
  • An objective of the present disclosure is to provide a paper of relatively high wet strength that is recyclable.
  • the present disclosure provides a paper (preferably a kraft paper) as defined in the current claim 1.
  • a paper comprising polyamino amide epichlorohydrin (PAE) resin, glyoxylated polyacrylamide and starch.
  • PAE resin polyamino amide epichlorohydrin
  • starch polyamino amide epichlorohydrin
  • the amount of G-PAM is preferably 0.5-6.0 kg/tonne dry paper and more preferably 1.0-5.0 kg/tonne dry paper, such as 1.5-4.0 kg/tonne dry paper.
  • the amount of PAE resin is preferably 0.25-1.50 kg/tonne dry paper, more preferably 0.30-1.25 kg/tonne dry paper, such as 0.30-1.10 kg/tonne dry paper or 0.40-1.25 kg/tonne dry paper.
  • the PAE resin and the G-PAM is typically added in the wet end.
  • the PAE resin and the G-PAM are thus wet end chemicals.
  • the paper is preferably a kraft paper, such as a machine glazed (MG) kraft paper.
  • MG machine glazed
  • the paper may be bleached or unbleached. Bleached paper is typically easier to repulp and may therefore be preferred.
  • the grammage of the paper is typically 35-200 g/m 2 and preferably 50-140 g/m 2 . In one embodiment, the grammage is 50-110 g/m 2 . In another embodiment, the grammage is 60-120 g/m 2 . In yet another embodiment, the grammage is 35-55 g/m 2 . In the present disclosure, grammage is measured according to ISO 536:2019.
  • the teachings of the present disclosure are not intended for tissue paper, such as bath, towel, facial or napkin paper. Accordingly, the paper of the present disclosure typically has a density of at least 600 kg/m 3 , such as 600-1000 kg/m 3 . In the present disclosure, density is measured according to ISO 534:2011.
  • the water absorbency of the paper is preferably relatively low.
  • the Cobb 60 s value of at least one side of the paper is preferably below 40 g/m 2 , more preferably below 30 g/m 2 , such as below 25 g/m 2 .
  • both sides of the paper have a Cobb 60 s value below 40 g/m 2 , such as below 30 g/m 2 , such as below 25 g/m 2 .
  • Cobb 60 s is measured according to ISO 535:2014.
  • hydrophobic size may be added, typically in the wet end of the paper machine.
  • hydrophobic size are AKD, ASA and rosin size.
  • the (dry) geometrical tensile index measured according to ISO 1924-3:2005 is at least 50 Nm/g, such as 50-150 Nm/g.
  • the geometrical wet tensile index measured according to ISO 1924-3:2005 (using a wetting time of 10 min) of the paper is typically at least 10 Nm/g, such as at least 15 Nm/g, such as at least 16 Nm/g.
  • the paper is preferably formed from a softwood pulp or a mixture of a softwood pulp and a hardwood pulp. Softwood pulp typically provides better strength and hardwood typically provides better surface properties.
  • At least 75% by dry weight of the fibres of the paper are virgin fibres and preferably at least 90% by dry weight of the fibres of the paper are virgin fibres.
  • Virgin fibres provide better strength than recycled fibres.
  • the paper of the present disclosure comprises less than 3.5 kg/tonne dry paper of starch, such as 1-3 kg/tonne dry paper of starch.
  • the starch is preferably cationic starch.
  • Strength may be impaired by the addition of inorganic filler to the paper pulp.
  • a high amount of filler corresponds to a high ash content.
  • the paper of the present disclosure preferably has an ash content of less than 7.0% by dry weight, such as less than 5.5% by dry weight.
  • the package is a Quick Service Restaurant food package.
  • the package is typically a bag or a wrap.
  • the package is a medical device package, in particular a medical device package that will undergo or has undergone gas or steam sterilization.
  • the package may be a sack, such as a potato sack or a sack for a hydraulic binder (e.g. a cement sack), a garbage bag, a pouch for foods (e.g. fruits or vegetables) or an e-commerce bag.
  • the grammage of the paper is typically in the range of 35-55 g/m 2 .
  • a coated barrier paper comprising a paper substrate, which is a paper according to the first aspect, and a barrier coating provided on the paper substrate.
  • Step Additive Fibre consist. (g/l) Dosage (g/kg dry fibre) Stirring time (s) 1 Fibre 12.5 2 PAE 12.5 Acc. to Table 2 30 3 AKD 12.5 30 4 G-PAM 12.5 Acc.
  • the sheets were cured at 105 °C for 2 * 30 minutes.
  • sheets were tested for the following properties: dry tensile strength (ten stripes per series in MD and seven stripes per series in CD except for series 2 for which only two stripes could be tested due to restricted amount of paper); COBB 60 s; air resistance (Gurley); and wet tensile strength measured after wetting times of 1, 3, 5, and 15 minutes (ten stripes per series in MD and seven stripes per series in CD except for series 2 for which only two stripes could be tested due to restricted amount of paper).
  • Tensile index values were calculated by dividing the tensile strength values by the grammage. Geometrical tensile index values were calculated as the geometrical mean of the tensile index in MD and the tensile index in CD.
  • WS3 means average geometrical wet tensile strength index measured after 3 minutes of wetting time.
  • WS5" means average geometrical wet tensile strength index measured after 5 minutes of wetting time.
  • WS15 means average geometrical wet tensile strength index measured after 15 minutes of wetting time.
  • FIG. 1 shows a sharp increase in the wet strength when 0.5 kg/tonne and 1.0 kg/tonne PAE is added, but a more modest increase when the amount is higher.
  • figure 2 shows a relatively modest decrease of the recyclability when 0.5 kg/tonne and 1.0 kg/tonne PAE is added, and a sharper decrease beyond those amounts. Consequently, figures 1 and 2 together show that the optimal amount of PAE is from about 0.25 kg/tonne to about 1.5 kg/tonne when high wet strength is to be combined with high recyclability, provided that G-PAM has been added.
  • Table 4 Average values for Cobb, Gurley and dry strength. The tests behind the results in this table were carried out between the first and the second curing, i.e. after curing at 105 °C for 1 * 30 minutes.
  • Series PAE kg/tonne
  • G-PAM kg/tonne
  • Cobb 60s g/m 2
  • Gurley s
  • Geometrical dry tensile strength index Nm/g

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Paper (AREA)

Claims (13)

  1. Papier comprenant une résine de polyaminoamide épichlorhydrine (PAE), du polyacrylamide glyoxylé (G-PAM) et de l'amidon, dans lequel :
    - la quantité de résine de PAE est comprise entre 0,15 et 1,75 kg/tonne de papier sec ;
    - la quantité d'amidon est comprise entre 1 et 3°kg/tonne de papier sec ; et
    - l'indice de traction géométrique à sec mesuré selon la norme ISO 1924-3:2005 est d'au moins 50 Nm/g, tel que compris entre 50 et 150 Nm/g.
  2. Papier selon la revendication 1, dans lequel la quantité de G-PAM est comprise entre 0,5 et 6,0 kg/tonne de papier sec, de préférence comprise entre 1,0 et 5,0 kg/tonne de papier sec, telle que comprise entre 1,5 et 4,0 kg/tonne de papier sec.
  3. Papier selon la revendication 1 ou la revendication 2, dans lequel la quantité de résine de PAE est comprise entre 0,25 et 1,50 kg/tonne de papier sec, de préférence comprise entre 0,30 et 1,25 kg/tonne de papier sec, telle que comprise entre 0,30 et 1,10 kg/tonne de papier sec ou comprise entre 0,40 et 1,25 kg/tonne de papier sec.
  4. Papier selon l'une quelconque des revendications précédentes, dans lequel ledit G-PAM est un GPAM cationique.
  5. Papier selon l'une quelconque des revendications précédentes, qui est un papier kraft, tel qu'un papier kraft glacé machine (MG).
  6. Papier selon l'une quelconque des revendications précédentes, qui est blanchi.
  7. Papier selon l'une quelconque des revendications précédentes, dans lequel le grammage mesuré selon la norme ISO 536:2019 est compris entre 35 et 200 g/m2, tel que compris entre 50 et 200 g/m2, de préférence compris entre 50 et 140 g/m2, tel que compris entre 50 et 110 g/m2 ou compris entre 60 et 120 g/m2.
  8. Papier selon l'une quelconque des revendications précédentes, dans lequel la densité mesurée selon la norme ISO 534:2011 est d'au moins 600 kg/m3, telle que comprise entre 600 et 1000 kg/m3.
  9. Papier selon l'une quelconque des revendications précédentes, dans lequel la valeur Cobb 60 s mesurée selon la norme ISO 535:2014 d'au moins un côté du papier est inférieure à 40 g/m2, de préférence inférieure à 30 g/m2, telle qu'inférieure à 25 g/m2.
  10. Papier selon l'une quelconque des revendications précédentes, dans lequel l'indice géométrique de résistance à l'état humide mesuré selon la norme ISO 1924-3:2005 est d'au moins 10 Nm/g, tel qu'au moins 15 Nm/g, tel qu'au moins 16 Nm/g.
  11. Papier selon l'une quelconque des revendications précédentes, qui est formé à partir d'une pâte de bois tendre ou d'un mélange d'une pâte de bois tendre et d'une pâte de bois dur.
  12. Papier selon l'une quelconque des revendications précédentes, dans lequel au moins 75 % en poids sec des fibres du papier sont des fibres vierges et, éventuellement, dans lequel au moins 90 % en poids sec des fibres du papier sont des fibres vierges.
  13. Emballage comprenant un papier selon l'une quelconque des revendications précédentes.
EP21217014.6A 2021-02-02 2021-12-22 Papier recyclable à haute résistance à l'état humide Active EP4202119B8 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP21217014.6A EP4202119B8 (fr) 2021-12-22 2021-12-22 Papier recyclable à haute résistance à l'état humide
US18/274,678 US20240110337A1 (en) 2021-02-02 2022-02-02 Papermaking Method
PCT/EP2022/052384 WO2022167437A1 (fr) 2021-02-02 2022-02-02 Procédé de fabrication de papier
CA3205747A CA3205747A1 (fr) 2021-02-02 2022-02-02 Procede de fabrication de papier
EP22703919.5A EP4288603A1 (fr) 2021-02-02 2022-02-02 Procédé de fabrication de papier
CN202280083098.4A CN118414461A (zh) 2021-12-22 2022-12-22 高湿强度的可循环再生纸
US18/723,175 US20250052008A1 (en) 2021-12-22 2022-12-22 Recyclable paper of high wet strength
PCT/EP2022/087656 WO2023118535A1 (fr) 2021-12-22 2022-12-22 Papier recyclable à haute résistance à l'humidité
EP22844479.0A EP4453313A1 (fr) 2021-12-22 2022-12-22 Papier recyclable à haute résistance à l'humidité
ZA2023/08329A ZA202308329B (en) 2021-02-02 2023-08-29 Papermaking method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21217014.6A EP4202119B8 (fr) 2021-12-22 2021-12-22 Papier recyclable à haute résistance à l'état humide

Publications (3)

Publication Number Publication Date
EP4202119A1 EP4202119A1 (fr) 2023-06-28
EP4202119B1 true EP4202119B1 (fr) 2025-10-15
EP4202119B8 EP4202119B8 (fr) 2025-11-26

Family

ID=79024963

Family Applications (2)

Application Number Title Priority Date Filing Date
EP21217014.6A Active EP4202119B8 (fr) 2021-02-02 2021-12-22 Papier recyclable à haute résistance à l'état humide
EP22844479.0A Pending EP4453313A1 (fr) 2021-12-22 2022-12-22 Papier recyclable à haute résistance à l'humidité

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP22844479.0A Pending EP4453313A1 (fr) 2021-12-22 2022-12-22 Papier recyclable à haute résistance à l'humidité

Country Status (4)

Country Link
US (1) US20250052008A1 (fr)
EP (2) EP4202119B8 (fr)
CN (1) CN118414461A (fr)
WO (1) WO2023118535A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995021298A1 (fr) * 1994-02-04 1995-08-10 The Mead Corporation Carton recyclable, resistant a l'etat humide
US5427652A (en) * 1994-02-04 1995-06-27 The Mead Corporation Repulpable wet strength paper
US6419789B1 (en) * 1996-10-11 2002-07-16 Fort James Corporation Method of making a non compacted paper web containing refined long fiber using a charge controlled headbox and a single ply towel made by the process
AU3217399A (en) * 1998-03-31 1999-10-18 Callaway Corporation Improving retention and drainage in alkaline fine paper
SE0001268L (sv) * 2000-04-06 2001-10-07 Sca Hygiene Prod Ab Förfarande för adsorption av på varandra följande tunna skikt av katjoniska och anjoniska polymerer på ytan hos partiklar eller grupper av partiklar, och pappers- eller nonwovenprodukt innehållande s ådana partiklar eller grupper av partiklar
US8512519B2 (en) * 2009-04-24 2013-08-20 Eastman Chemical Company Sulfopolyesters for paper strength and process
US9347181B2 (en) * 2013-11-22 2016-05-24 Kemira Oyj Method for increasing paper strength
CN105696414B (zh) * 2014-11-27 2022-08-16 艺康美国股份有限公司 造纸助剂组合物以及提高纸张抗张强度的方法
US10435843B2 (en) * 2016-02-16 2019-10-08 Kemira Oyj Method for producing paper

Also Published As

Publication number Publication date
EP4202119B8 (fr) 2025-11-26
EP4202119A1 (fr) 2023-06-28
EP4453313A1 (fr) 2024-10-30
CN118414461A (zh) 2024-07-30
US20250052008A1 (en) 2025-02-13
WO2023118535A1 (fr) 2023-06-29

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