US20220213649A1 - Efficient production of a containerboard to be used as fluting - Google Patents

Efficient production of a containerboard to be used as fluting Download PDF

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Publication number
US20220213649A1
US20220213649A1 US17/611,434 US202017611434A US2022213649A1 US 20220213649 A1 US20220213649 A1 US 20220213649A1 US 202017611434 A US202017611434 A US 202017611434A US 2022213649 A1 US2022213649 A1 US 2022213649A1
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pulp
nssc
press
shoe press
containerboard
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US17/611,434
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English (en)
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Fredrik Nordstrom
Johan Kullander
Mikael Karpathakis
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Billerudkorsnas AB
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Billerudkorsnas AB
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • 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
    • 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 invention relates to a method of producing a containerboard to be used as fluting.
  • Neutral Sulfite Semi-Chemical (NSSC) pulping is an old process that it is well known in the field of paper pulping and in use in many pulp mills around the world.
  • One of the reasons for using NSSC pulping is the high yield.
  • the cooking liquor comprises sulfite, such as Na 2 SO 3 or (NH 4 ) 2 SO 3 and a base, such as NaOH or Na 2 CO 3 .
  • “Neutral” means that the pH of the NSSC cooking liquor is generally between 6 and 10. Normally, the cooking time is between 0.5 and 3 hours and the cooking temperature is 160-185° C.
  • the NSSC pulp comprises comparatively high amounts of residual lignin, such as 15-20%, which make the NSSC pulp stiff.
  • the NSSC pulping is “semi-chemical” in the sense that it comprises mechanical treatment/grinding (after the chemical (cooking step)).
  • the NSSC pulp is for example used to produce containerboard that is subsequently corrugated to form the fluting of corrugated board.
  • mills using the NSSC pulping method are: BillerudKorsnäs' mills in Gruvön (PM 6) and Skärblacka (PM4), Sweden; Mondi Swiecie S.A.'s mill in Swiecie (PM 4), Poland; Mondi's (Powerflute's) mill in Koupio, Finland; Stora Enso Oyj's mill in Heinola, Finland (Heinola Fluting Mill); S.C. Celrom S.A.'s mill in Drobeta, Romania; Packaging Corp.
  • EP3026173 discloses a method of producing a containerboard (to be used as fluting) of increased SCT strength from pulp comprising NSSC pulp. According to the method, a web formed from the pulp comprising NSSC pulp is pressed in a shoe press, in which the line load is at least 1200 kN/m.
  • the SCT strength of NSSC-based containerboard to be used as fluting is increased when the NSSC pulp is subjected to more refining.
  • the rebuild of PM4 in Swiecie in 2015 involved a rebuild of the refining system to allow for more refining of the NSSC pulp in order to increase SCT strength.
  • Billerud AB now BillerudKorsnäs AB
  • the object of the present disclosure is to increase the efficiency of the method disclosed in EP3026173 while maintaining the SCT strength of the product at a high level.
  • the increased efficiency may be an increased energy efficiency (i.e. a reduced amount of energy consumed for producing one tonne of paper) and/or a higher productivity (i.e. that a higher amount of paper can be produced by the paper machine used for the method).
  • a method of producing of a containerboard having a geometric SCT index of 37.0-42.0 Nm/g when measured according to ISO 9895:2008 comprising the steps of:
  • the method may also be described as follows:
  • the above range for the Schopper-Riegler value of the pulp (15-19) reflects a very low degree of refining, which means low energy consumption in that stage of the papermaking process.
  • the inventor has also shown that a reduction of the refining energy results in that less energy (i.e. less steam) is needed for drying the paper web formed from the pulp in the drying section.
  • the inventors have found that the low degree of refining is not associated with an impaired SCT strength when the production is carried out according to the present disclosure.
  • the inventors have found that increasing the line load to 1400 kN/m or more generally does not increase dewatering of the web unless the right type of shoe press belt is selected. When the right belt is selected, however, such an increase of the line load effectively reduces the amount of steam needed to dry the paper web in the downstream drying section.
  • the present disclosure can thus make the production of NSSC-based containerboard more energy efficient, which is of particular interest since the yield of the NSSC pulping process is so high that the remaining biofuel (that is combusted in the recovery boiler) is insufficient for the papermaking process. Consequently, NSSC mills are dependent on external energy. If the NSSC mill is not integrated with an adjacent sulphate mill that produces a surplus of biofuel, it may be necessary to use fossil fuel as the external energy. Examples of such non-integrated NSSC mills are the Heinola Fluting Mill and the Powerflute Mill. Further, the speed of many papermaking processes is limited by the drying capacity of the drying section. This limitation is a particular problem when containerboard of higher grammages is produced. By providing a web that requires less drying energy in the drying section, the present disclosure allows for higher speed and thus higher productivity in the making of NSSC-based containerboard.
  • FIG. 1 is a graph showing the shoe press line load and the resulting specific steam consumption (medium pressure steam at about 8 bar) in the drying section during the inventive trial described below.
  • the shoe press line load was 1300 kN/m during a first period (“1 st ”) and a third period (“3 rd ”).
  • the shoe press line load was 1700 kN/m.
  • the containerboard is intended for use as fluting (i.e. corrugated medium) in corrugated board.
  • the method is intended to be used on a full-scale paper machine, i.e. a machine adapted to produce at least 50,000 tons of containerboard per year, normally at least 100,000 tons of containerboard per year.
  • the grammage of the containerboard may be in the range of 100-240 g/m 2 , such as 110-240 g/m 2 , such as 120-240 g/m 2 , such as 120-200 g/m 2 or 140-230 g/m 2 , such as 150-230 g/m 2 . Grammage is measured according to ISO 536:2012.
  • the geometric SCT index of the containerboard is 38.0-42.0 Nm/g, such as 38.0-41.0 Nm/g.
  • the compressive strength in the machine direction (MD) and the cross direction (CD) of the containerboard is first measured using a short-span compressive tester (SCT) measured according to ISO 9895:2008.
  • SCT short-span compressive tester
  • N/m the compressive strength
  • the unit of the SCT index is thus Nm/g.
  • the geometric SCT index is calculated as the square root of the product of the SCT index in MD and CD:
  • geometric SCT index ⁇ (SCT index (MD)*SCT index (CD)).
  • the compressive strength is considered to be more important in CD than in MD.
  • the SCT index in the CD of the containerboard may for example be above 28 Nm/g, such as at least 29 Nm/g.
  • An upper limit for the SCT index index may for example be 32 Nm/g.
  • the method comprises the step of:
  • the SR value is 16-19. In another embodiment, the SR value is 15-18.
  • the SR value referred to above is the SR value that the pulp has in the head box (i.e. the chamber from which the pulp is caused to flow onto the wire of the wire section).
  • the pulp of the present disclosure may be subjected to refining, such as LC refining, between the NSSC pulping process and the head box.
  • At least 80% by dry weight of the pulp is NSSC pulp. In one example, at least 85% or 88% by dry weight of the pulp is NSSC pulp.
  • the NSSC pulp may comprise hardwood NSSC pulp.
  • at least 70% by dry weight of the NSSC pulp is hardwood NSSC pulp, such as birch NSSC pulp.
  • at least 80% by dry weight of the NSSC pulp is hardwood NSSC pulp, such as birch NSSC pulp.
  • the yield of the NSSC pulp of the present disclosure may thus be 75%-85%, preferably 79%-85%, such as 80-84%.
  • the pulp may comprise recycled fibers, reject pulp and/or clippings (typically corrugated box plant clippings).
  • the above-mentioned LC refining may be carried out before or after mixing with such other fibres.
  • NSSC pulp is obtained from “NSSC pulping”, which in turn is defined in the background section.
  • the NSSC pulp of the present disclosure may for example be sodium-based NSSC pulp, which means that the cooking liquor of the NSSC cook comprised Na 2 SO 3 .
  • the method further comprises the step of:
  • the head box consistency may for example be 0.50%-1.20%, such as 0.80%-1.20%, such as 0.90%-1.15%.
  • the higher consistencies are particularly relevant when a large proportion (e.g. at least 80%) of the NSSC pulp is derived from hardwood.
  • the head box consistency is 1.05%-1.20% and the grammage of the containerboard is 140-240 g/m 2 , such as 140-240 g/m 2 .
  • the method further comprises the step of:
  • the nip length in the shoe press may for example be 200-330 mm, such as 250-300 mm.
  • the shoe press is typically a double felted shoe press.
  • the shoe press comprises a shoe press belt having discontinuous grooves.
  • a shoe press belt is commercially available.
  • One example is the BlackBelt G DG marketed by Valmet.
  • Another example is Valmet Black Belt H DG marketed by Valmet.
  • the hardness of the elastomer in the shoe press belt may for example be 93-95 Shore A.
  • the line load in the shoe press is in the range of 1400-2000 kN/m, preferably 1500-2000 kN/m, such as 1600-2000 kN/m, such as 1600-1800 kN/m.
  • the web may be subjected to a press impulse of 105-280 kPa*s, such as 105-190 kPa*s, such as 105-135 kPa*s.
  • the highest press impulses are obtained when the line load is relatively high and the web speed is relatively low (because of a high grammage of the produced containerboard).
  • the press section may comprise another press arranged upstream the shoe press.
  • the other press is typically double felted and may for example be a jumbo press or a shoe press.
  • the line load of the other press may be 100-300 kN/m, such as 150-250 kN/m, in particular in case of a jumbo press.
  • the method further comprises the step of:
  • NSSC containerboard (intended for fluting) of various grammages was produced in the Gruvön mill, Sweden. Data from the production is presented in table 1.
  • the pulp was a mixture of about 90% NSSC pulp from birch and about 10% kraft pulp. The pulp was refined. The resulting SR numbers are presented in table 1.
  • the press section had two double felted nips; first a jumbo press and then a shoe press with a shoe press belt having blind drilled holes.
  • the line load of the jumbo press was 180 kN/m.
  • NSSC containerboard (intended for fluting) of the same grammages was produced in the Gruvön mill, Sweden. Data from the production is presented in table 2. Again, the pulp was a mixture of about 90% NSSC pulp from birch and about 10% kraft pulp and it was refined. The resulting SR numbers are presented in table 2.
  • the press section was the same as during the first period except that another shoe press belt was used. This new shoe press belt had discontinuous grooves. The characteristics of the grooves were:
  • NSSC containerboard (intended for fluting) having a grammage of 140 g/m 2 was produced in the Gruvön mill, Sweden.
  • the pulp was a mixture of about 90% NSSC pulp from birch and about 10% kraft pulp. The pulp was refined.
  • the resulting SR numbers are presented in table 3 along with other data from the production.
  • NSSC containerboard (intended for fluting) having a grammage of 160 g/m 2 was produced in the Gruvön mill, Sweden.
  • the pulp was a mixture of about 90% NSSC pulp from birch and about 10% kraft pulp.
  • the pulp was refined.
  • the resulting SR numbers are presented in table 4 along with other data from the production.
  • the shoe press line load was then gradually increased and during a second period of about two hours, the shoe press line load was 1700 kN/m.
  • the shoe press line load was then gradually decreased and during a third period of about one hour, the shoe press line load was again 1300 kN/m. Data from the production is presented in table 4 (see also FIG. 1 ).
  • the average geometric SCT index of the containerboard produced during the second period was 38.3 Nm/g.
  • the SCT index in the cross direction was 29.4 Nm/g.

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  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
US17/611,434 2019-05-14 2020-05-14 Efficient production of a containerboard to be used as fluting Pending US20220213649A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP19174469.7 2019-05-14
EP19174469.7A EP3739114B1 (en) 2019-05-14 2019-05-14 Efficient production of a containerboard to be used as fluting
PCT/EP2020/063488 WO2020229611A1 (en) 2019-05-14 2020-05-14 Efficient production of a containerboard to be used as fluting

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US20220213649A1 true US20220213649A1 (en) 2022-07-07

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US17/611,434 Pending US20220213649A1 (en) 2019-05-14 2020-05-14 Efficient production of a containerboard to be used as fluting

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US (1) US20220213649A1 (pl)
EP (5) EP3739114B1 (pl)
CN (1) CN113825876B (pl)
CA (1) CA3137795A1 (pl)
ES (2) ES2882002T3 (pl)
FI (1) FI3889345T3 (pl)
PL (3) PL3739114T3 (pl)
WO (1) WO2020229611A1 (pl)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE544926C2 (en) * 2021-05-17 2023-01-10 Stora Enso Oyj Multiply containerboard for use in corrugated board
EP4261346A1 (en) * 2022-04-14 2023-10-18 Billerud Aktiebolag (publ) Production of paper- or linerboard
BR102022011333A2 (pt) * 2022-06-09 2023-12-19 Klabin S.A. Papel-miolo semiquímico, embalagem e uso

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090029051A1 (en) * 2003-11-18 2009-01-29 Fitzpatrick Keith Shoe press belt having a grooved surface
US20170327285A1 (en) * 2014-11-26 2017-11-16 Billerudkorsnas Ab High-strength fluting from nssc pulp

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015223664A1 (de) * 2015-11-30 2017-06-01 Voith Patent Gmbh Vorrichtung und verfahren zur herstellung einer faserstoffbahn
DE102015223662A1 (de) * 2015-11-30 2017-06-14 Voith Patent Gmbh Vorrichtung zur Herstellung einer Faserstoffbahn
FR3049194B1 (fr) 2016-03-23 2019-10-04 Sederma Utilisation d’un ingredient cosmetique comprenant un materiel vegetal issu de marrubium vulgare pour un traitement cosmetique
RU2738381C2 (ru) 2016-03-23 2020-12-11 Стора Энсо Ойй Картон с улучшенным пределом прочности при сжатии
SE540115C2 (en) * 2016-09-21 2018-04-03 A paper or paperboard product comprising at least one ply containing high yield pulp and its production method
EP3385444B1 (en) * 2017-04-06 2019-04-24 BillerudKorsnäs AB Production of paper that is highly stretchable in the cross direction

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090029051A1 (en) * 2003-11-18 2009-01-29 Fitzpatrick Keith Shoe press belt having a grooved surface
US20170327285A1 (en) * 2014-11-26 2017-11-16 Billerudkorsnas Ab High-strength fluting from nssc pulp

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Ramid Forouzanfar et al. entitled: NSSC pulp from planted populus and hardwood sawdust for flutting production, Received: 6 January 2016 / Accepted: 15 April 2016 / Published online: 27 April 2016---Indian Academy of Wood Science 2016 (Year: 2016) *

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Publication number Publication date
EP3739114B1 (en) 2021-03-10
CA3137795A1 (en) 2020-11-19
CN113825876A (zh) 2021-12-21
EP3739115A1 (en) 2020-11-18
ES2877201T3 (es) 2021-11-16
EP3889345A1 (en) 2021-10-06
EP3969658A1 (en) 2022-03-23
EP3885490A1 (en) 2021-09-29
EP3739115B1 (en) 2021-03-17
EP3889345B1 (en) 2023-02-01
WO2020229611A1 (en) 2020-11-19
PL3739114T3 (pl) 2021-10-25
PL3739115T3 (pl) 2021-10-25
FI3889345T3 (fi) 2023-05-04
ES2882002T3 (es) 2021-11-30
PL3889345T3 (pl) 2023-05-29
EP3739114A1 (en) 2020-11-18
CN113825876B (zh) 2024-06-18

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