Patents Assigned to BillerudKorsnäs AB
  • Patent number: 12269242
    Abstract: There is provided a packaging material comprising a fibre based substrate and a gas barrier layer based on a polyvinyl alcohol (PVOH), wherein said gas barrier layer comprises an interpolymer complex forming agent (IPCFA), which IPCFA is a water-soluble polymer exhibiting functional groups capable of forming hydrogen bonds with —OH groups of the PVOH. Said PVOH has a weight average molecular weight (Mw) measured according to ASTM D4001-13 in the range of about 80 kg/mol to 135 kg/mol, the proportion of said IPCFA to PVOH in said gas barrier layer is in the range of 0.5 to 7.0% (w/w) and said packaging material has an oxygen permeability (OP) below 14 ml ?m/m2 day atm, which OP is obtained by multiplying the oxygen transmission rate (OTR) of the packaging material measured according to ASTM F1927-7 at a relative humidity (RH) of 80% and 23° C. by the thickness of the gas barrier layer.
    Type: Grant
    Filed: October 29, 2019
    Date of Patent: April 8, 2025
    Assignee: Billerudkorsnas AB
    Inventor: Ali Naderi
  • Patent number: 11814227
    Abstract: There is provided a method of producing a containerboard, comprising the step of pressing a web formed from a pulp comprising NSSC pulp in an extended nip press, such as a shoe press, wherein the line load in the extended nip press is above 1200 kN/m. Further, there is provided a corrugated board comprising a liner and a fluting, wherein the fluting is formed from a pulp comprising NSSC pulp, the density of the fluting is above 725 kg/m3 and the geometric SCT index (ISO 9895) of the fluting is above 37 Nm/g.
    Type: Grant
    Filed: November 3, 2020
    Date of Patent: November 14, 2023
    Assignee: BillerudKorsnas AB
    Inventor: Fredrik Nordstrom
  • Patent number: 11746472
    Abstract: There is provided a use of a pulp mixture for forming a container in a mould, which pulp mixture comprises: 65-90%, such as 70-84%, by dry weight of a first pulp having a Schopper-Riegler (SR) number of below 48, preferably below 40, more preferably below 30; and 10-35%, such as 16-30%, by dry weight of a second pulp having a Schopper-Riegler (SR) number of 60-90, preferably 70-90, more preferably 77-90. A pulp mixture and a method of producing a pulp mixture are also provided.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: September 5, 2023
    Assignee: BillerudKorsnas AB
    Inventors: Irina Rauvanto, Lars Hilden
  • Patent number: 11352171
    Abstract: A paper bag for e-commerce shipments, which paper bag comprises first closure means for first closure of the bag (46, 49, 123, 127a, 127b, 227a, 337, 337a), tear means (47, 126, 136, 226a, 226b, 336) for opening the bag after first closure and second closure means (45, 48, 137, 137a, 238a, 238b, 338, 338a) for reclosing the bag after tearing the tear means. The paper bag is formed of a paper having specific properties concerning—inter alia—the grammage, the tensile index, the bending resistance and the like for rendering the bag especially durable and reliable in use.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: June 7, 2022
    Assignee: BillerudKorsnas AB
    Inventors: Valdemar Forsblom, Ove Lindstrom, Andreas Abacka
  • Patent number: 11339535
    Abstract: There is provided a method of producing a paper having a grammage according to ISO 536 of 50-250 g/m2, a Gurley value according to ISO 5636-5 of above 15 s and a stretchability according to ISO 1924-3 in the machine direction of at least 9%, said method comprising the steps of: a) providing a pulp, preferably sulphate pulp; b) subjecting the pulp to refining; c) diluting the pulp from step b) and adding the diluted pulp to a forming wire to obtain a paper web; d) pressing and the paper web from step c); e) drying the paper web from step d); f) compacting the paper web from step e) in a Clupak unit at a moisture content of 32-50%, preferably 37-49%, more preferably 41-49%; g) calendering the paper web from step f), optionally after drying, at a moisture content of 21-40%, preferably 30-40%, more preferably 32-39%; h) drying the paper web from step g).
    Type: Grant
    Filed: April 5, 2018
    Date of Patent: May 24, 2022
    Assignee: BillerudKorsnäs AB
    Inventors: Nils Nordling, Tommy Stenman, Erik Lindberg
  • Patent number: 10384424
    Abstract: There is provided a package material comprising an oxygen barrier polymer film, wherein the film comprises a polymer obtainable by a process comprising the steps of: a) oxidizing cellulose fibers to ultimately obtain cross-linked cellulose; and b) homogenizing the product of step a) to obtain fibrils in a width range of 1 nm to 150 nm. A corresponding use is also provided.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: August 20, 2019
    Assignee: BillerudKorsnäs AB
    Inventors: Per Larsson, Lars Wagberg
  • Patent number: 10351632
    Abstract: There is provided a use of a material comprising fibers as an oxygen barrier, wherein the fibers comprise native cellulose and dialcohol cellulose. There is also provided a material comprising fibers and having a density of at least 1200 kg/m3, wherein the fibers comprise native cellulose and dialcohol cellulose and the oxygen permeability of the material according to ASTM D3985 is below 30 ml·?m/(m2·kPa·24 h) at 23° C. and 80% relative humidity.
    Type: Grant
    Filed: June 30, 2016
    Date of Patent: July 16, 2019
    Assignee: BillerudKorsnas AB
    Inventors: Per Larsson, Lars Wagberg
  • Patent number: 10086585
    Abstract: A paper laminate comprising a first stretchable paper layer, a second stretchable paper layer and an intermediate paper layer arranged between the first and the second stretchable paper layer, characterized in that the stretchability (ISO 1924/3) of the first and the second stretchable paper layer is at least 5% in both the machine direction (MD) and the cross direction (CD) and the stretchability (ISO 1924/3) of the intermediate paper layer is less than 4% in the MD and/or the CD.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: October 2, 2018
    Assignee: BillerudKorsnäs AB
    Inventors: Åke Reuterhage, Anders Gåsste, Johan Byman, Peter Bergström