EP3889345A1 - Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure - Google Patents

Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure Download PDF

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Publication number
EP3889345A1
EP3889345A1 EP21160869.0A EP21160869A EP3889345A1 EP 3889345 A1 EP3889345 A1 EP 3889345A1 EP 21160869 A EP21160869 A EP 21160869A EP 3889345 A1 EP3889345 A1 EP 3889345A1
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EP
European Patent Office
Prior art keywords
pulp
nssc
press
web
containerboard
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.)
Granted
Application number
EP21160869.0A
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German (de)
English (en)
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EP3889345B1 (fr
Inventor
Fredrik Nordström
Johan KULLANDER
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Billerud 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.
  • the cooking time is between 0.5 and 3 hours and the cooking temperature is 160-185 °C.
  • the cooking time may be as short as 15 min, in particularly in case of a relatively high temperature, such as ⁇ 180 °C.
  • the NSSC pulp comprises comparatively high amounts of residual lignin, such as 15-20 %, which make the NSSC pulp fibers 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 object of the present disclosure is to optimize the production of NSSC-based containerboard intended to be used as fluting.
  • a method of producing a containerboard for use as fluting comprising the steps of:
  • the above range for the SR value of the pulp (16.0-19.0) reflects a very low degree of refining, which means low energy consumption in that stage of the papermaking process.
  • the inventors have shown that a reduction of the refining energy results in a drastically reduced energy consumption (i.e. steam consumption) in the drying section.
  • the containerboard produced by the method of the present disclosure is surprisingly strong. The inventors have thus identified an optimum at which strong containerboard is produced at low energy consumption.
  • 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 present invention may have particular value when the grammage is relatively high, e.g. 140-230 g/m 2 .
  • the geometric SCT index (measured according to ISO 9895:2008) of the containerboard is 37.0-43.0 Nm/g, such as 37.0-42.0 Nm/g, such as 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 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 in CD may for example be 32 Nm/g.
  • the method comprises the step of:
  • 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 is typically subjected to low consistency (LC) refining between the NSSC pulping process and the head box.
  • the energy input of such LC refining may for example be 40-65 kWh/tonne, such as 40-60 kWh/tonne.
  • the "energy input" having the unit kWh/tonne means, in the context of the present disclosure, the net energy input, which excludes the no-load power.
  • the "tonne" of the unit means tonne of dry fiber.
  • the SR value is 16.0-18.5.
  • 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 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 140-200 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 may comprise a shoe press belt having discontinuous grooves.
  • a shoe press belt is commercially available.
  • An 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 1200-2000 kN/m, preferably 1300-2000 kN/m.
  • a higher shoe press line load typically correlates with a higher geometric SCT index.
  • the web maybe 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 pulp was obtained from a full-scale process of producing NSSC containerboard (intended for fluting) in the Gruvön mill (PM 6), Sweden.
  • a first pulp sample was obtained from a position upstream the two LC refining steps of the process. Accordingly, this pulp had been subjected to 0 kWh/tonne of LC refining.
  • a second and a third pulp sample were obtained from a position between the two LC refining steps of the process. These pulp samples had been subjected to 20 and 40 kWh/tonne of LC refining, respectively.
  • composition of all samples was 100% NSSC pulp from birch.
  • SR Schopper-Riegler
  • Raphid Köhten lab sheets having grammages of about 100 g/m 2 were produced from the pulp samples according to ISO 5269-2:2004. The actual grammages were then measured. The following strength parameters of the lab sheets were measured at 50% and 90% relative humidity: SCT (ISO 9895:2008); CCT (SCAN P-42); CMT (SS-EN ISO 7263:2011); and tensile stiffness (SS-ISO 1924-3:2011). The measured strength parameters were indexed by the measured grammages (by dividing a value by the grammage, an indexed value is obtained).
  • the SCT is often considered to be the most important strength parameter.
  • Figure 1 shows the SCT index values, which increases with increased refining up to 60 kWh/tonne (corresponding to an SR value of 18.50). Between 60 and 80 kWh/tonne, no increase was observed.
  • the pulp form which samples 1-4 were obtained was subjected to a total of 60 kWh/tonne LC refining in the full-scale process. To obtain samples 5-7, the total LC refining was successively increased up to 115 kWh/tonne. Subsequent to the LC refining, the NSSC pulp was mixed with kraft pulp in a 90:10 dry weight ratio.
  • a web was formed in a forming section.
  • the headbox consistency was about 0.94%.
  • the web was then pressed in a press section and dried in a drying section.
  • Paper produced by the full-scale process was obtained at 18:26 (see figure 5 ), which means that the paper was formed from pulp subjected to a total of 60 kWh/tonne LC refining. Samples of the paper was tested. Despite the moderate level of refining, the SCT index at 50% RH (ISO 9895:2008) of the sampled paper was 56.0 Nm/g in MD and 29.4 Nm/g in CD, resulting in a geometric SCT index of 40.59 Nm/g. The grammage was 120 g/m 2 .

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  • Paper (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP21160869.0A 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure Active EP3889345B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19174469.7A EP3739114B1 (fr) 2019-05-14 2019-05-14 Production efficace d'un carton-caisse destiné à être utilisé en tant que cannelure
EP20174696.3A EP3739115B1 (fr) 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP20174696.3A Division EP3739115B1 (fr) 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure

Publications (2)

Publication Number Publication Date
EP3889345A1 true EP3889345A1 (fr) 2021-10-06
EP3889345B1 EP3889345B1 (fr) 2023-02-01

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ID=66554181

Family Applications (5)

Application Number Title Priority Date Filing Date
EP19174469.7A Active EP3739114B1 (fr) 2019-05-14 2019-05-14 Production efficace d'un carton-caisse destiné à être utilisé en tant que cannelure
EP21160868.2A Pending EP3885490A1 (fr) 2019-05-14 2019-05-14 Production efficace d'un carton-caisse destiné à être utilisé en tant que cannelure
EP20725179.4A Pending EP3969658A1 (fr) 2019-05-14 2020-05-14 Production efficace d'un carton-caisse à utiliser en tant que papier cannelé
EP21160869.0A Active EP3889345B1 (fr) 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure
EP20174696.3A Active EP3739115B1 (fr) 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure

Family Applications Before (3)

Application Number Title Priority Date Filing Date
EP19174469.7A Active EP3739114B1 (fr) 2019-05-14 2019-05-14 Production efficace d'un carton-caisse destiné à être utilisé en tant que cannelure
EP21160868.2A Pending EP3885490A1 (fr) 2019-05-14 2019-05-14 Production efficace d'un carton-caisse destiné à être utilisé en tant que cannelure
EP20725179.4A Pending EP3969658A1 (fr) 2019-05-14 2020-05-14 Production efficace d'un carton-caisse à utiliser en tant que papier cannelé

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP20174696.3A Active EP3739115B1 (fr) 2019-05-14 2020-05-14 Production optimisée d'un carton-caisse destiné à être utilisé en tant que cannelure

Country Status (8)

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

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 (fr) * 2022-04-14 2023-10-18 Billerud Aktiebolag (publ) Production de papier ou de carton doublure
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
EP3026173A1 (fr) * 2014-11-26 2016-06-01 BillerudKorsnäs AB Procédé de production d'un carton à partir de pulpe à papier comprenant NSSC pulpe
WO2018054957A1 (fr) * 2016-09-21 2018-03-29 Hoeglund Hans Produit en papier ou en carton comprenant au moins un pli contenant une pâte à haut rendement et son procédé de production

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8080137B2 (en) * 2003-11-18 2011-12-20 Albany International Corp. Shoe press belt having a grooved surface
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
BR112018069142A2 (pt) 2016-03-23 2019-01-22 Stora Enso Oyj papelão com resistência à compressão aperfeiçoada
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
PL3385444T3 (pl) * 2017-04-06 2020-01-31 Billerudkorsnäs Ab Wytwarzanie papieru, który jest wysoce rozciągliwy w kierunku poprzecznym

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3026173A1 (fr) * 2014-11-26 2016-06-01 BillerudKorsnäs AB Procédé de production d'un carton à partir de pulpe à papier comprenant NSSC pulpe
WO2018054957A1 (fr) * 2016-09-21 2018-03-29 Hoeglund Hans Produit en papier ou en carton comprenant au moins un pli contenant une pâte à haut rendement et son procédé de production

Also Published As

Publication number Publication date
ES2877201T3 (es) 2021-11-16
ES2882002T3 (es) 2021-11-30
PL3739115T3 (pl) 2021-10-25
PL3739114T3 (pl) 2021-10-25
PL3889345T3 (pl) 2023-05-29
EP3739115A1 (fr) 2020-11-18
CN113825876A (zh) 2021-12-21
EP3969658A1 (fr) 2022-03-23
EP3889345B1 (fr) 2023-02-01
EP3739115B1 (fr) 2021-03-17
FI3889345T3 (fi) 2023-05-04
WO2020229611A1 (fr) 2020-11-19
EP3739114B1 (fr) 2021-03-10
CA3137795A1 (fr) 2020-11-19
EP3885490A1 (fr) 2021-09-29
EP3739114A1 (fr) 2020-11-18
US20220213649A1 (en) 2022-07-07
CN113825876B (zh) 2024-06-18

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