PRODUCTION OF PAPER- OR LINERBOARD
    7.
    发明公开

    公开(公告)号:EP4261346A1

    公开(公告)日:2023-10-18

    申请号:EP22168616.5

    申请日:2022-04-14

    摘要: There is provided a method of producing a paper- or linerboard having a grammage measured according to ISO 536:2019 of 170-310 g/m 2 and comprising a print layer, a middle layer and a back layer, wherein the middle layer is formed from a middle layer furnish comprising at least 25% by dry weight CTMP and the back layer is formed from a back layer furnish comprising an unbleached pulp, such as an unbleached kraft pulp, said method comprising the step of subjecting a multi-layered web at a speed of at least 600 m/min to pressing in a press section comprising a first and a second double-felted shoe press nip arranged in series, wherein the total press impulse of the double-felted shoe press nips is at least 95 kPa ∗ s, preferably at least 100 kPa ∗ s.