EP3502348B1 - Faserfraktionierung - Google Patents

Faserfraktionierung Download PDF

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Publication number
EP3502348B1
EP3502348B1 EP17209806.3A EP17209806A EP3502348B1 EP 3502348 B1 EP3502348 B1 EP 3502348B1 EP 17209806 A EP17209806 A EP 17209806A EP 3502348 B1 EP3502348 B1 EP 3502348B1
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European Patent Office
Prior art keywords
pulp
layer
broke
mixture
chemical
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EP17209806.3A
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English (en)
French (fr)
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EP3502348A1 (de
Inventor
Mats Häggquist
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Billerudkorsnas AB
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Billerudkorsnas AB
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Priority to EP17209806.3A priority Critical patent/EP3502348B1/de
Priority to PCT/EP2018/085408 priority patent/WO2019121625A1/en
Priority to CN201880081658.6A priority patent/CN111511988B/zh
Publication of EP3502348A1 publication Critical patent/EP3502348A1/de
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    • 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
    • D21H27/30—Multi-ply
    • D21H27/38—Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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

Definitions

  • the invention relates to the field of paperboard production in a paperboard machine.
  • Stiffness in the form of bending resistance is an important parameter for many paperboard applications.
  • the prior art describes many ways of increasing this stiffness, preferably with minimal increase in fibre consumption as fibre is a main cost driver in paperboard production.
  • One way is to produce a paperboard of at least three layers, wherein the outer layers have a relatively high tensile stiffness and the middle layer is bulky and relatively low tensile stiffness.
  • Another paperboard property of interest is the surface roughness, in particular that of the top surface that is typically intended for printing.
  • WO 2016/140609 discloses a pulp mixture comprising a first pulp and a second pulp, the first pulp consisting of a chemical softwood pulp which has been subjected to high consistency refining followed by low consistency refining, the second pulp consisting of a bulk increasing pulp selected from the group consisting of a chemi-thermomechanical pulp (CTMP), a thermomechanical pulp (TMP) and a chemical softwood pulp which has been subjected to low consistency refining without preceding high consistency refining, and wherein: in the case the second pulp is a CTMP or a TMP, the first pulp is present in an amount of 20-90 %, such as 25-90 %, such as 50-90 % by dry weight of the total dry weight of the first pulp and the second pulp; in the case the second pulp is a chemical softwood pulp which has been subjected to a low consistency refining without preceding high consistency refining, the first pulp is present in an amount of 5-90 % by dry weight of the total dry weight of the first
  • WO 2008/153565 relates to producing paper or paperboard having improved stiffness and strength, compared to the conventional paperboard at the same basis weight. It also discloses a method of wood pulping having a significantly increased yield and providing fiber pulps with enhanced properties such as strength and stiffness. Wood chips are chemically pulped to a high kappa number, providing a rejects component and an accepts component. The rejects component is subjected to a substantially mechanical pulping process, optionally in a presence of bleaching agent, prior to blending back into the accepts component. The resulting fiber blend is washed, optionally bleached, and subjected to a papermaking process to provide paper or paperboard with enhanced strength and stiffness at low basis weight.
  • US 2008/0308239 relates to producing paper or paperboard having improved stiffness and strength, compared to the conventional paperboard at the same basis weight. It also discloses a method of wood pulping having a significantly increased yield and providing fiber pulps with enhanced properties such as strength and stiffness. Wood chips are chemically pulped to a high kappa number, providing a rejects component and an accepts component. The rejects component is subjected to a substantially mechanical pulping process, optionally in a presence of bleaching agent, prior to blending back into the accepts component. The resulting fiber blend is washed, optionally bleached, and subjected to a papermaking process to provide paper or paperboard with enhanced strength and stiffness at low basis weight.
  • US 5,916,417 discloses that stiffness improvements for multi-ply paperboard laid from chemically pulped softwood and hardwood papermaking furnish are obtained by fiber fractionating the softwood pulp and repositioning the resulting fractions.
  • Chemically pulped and preferably bleached softwood fiber "rejects" of a fractionation screen are redistributed into the outer plies of a three-ply, 300-350 g/m (approximately 195 #/3,000 ft.) basis weight paperboard.
  • the fractionation "accepts” are repositioned to the center ply for a 12% to 15% increase in Taber stiffness.
  • the short, "accept” fiber from the fractionation screen is mixed with chemically pulped hardwood fiber or modified mechanical pulp of either species for formation of the center ply on a multiformer paper machine.
  • the objective has been met by mixing broke pulp that was previously only used for the middle layer with chemical pulp that was previously used for the bottom layer and fractionating the mixture so as to obtain an accept fraction that is used for forming the bottom layer and a reject fraction that is mixed with unfractionated broke pulp and/or another pulp and then used for forming the middle layer.
  • the present disclosure provides a method of producing a multi-layer paperboard comprising a first layer, a second layer and a third layer, wherein the second layer is arranged between the first layer and the third layer, which method comprises the steps of:
  • the method of the present disclosure results in a substantial increase of the bending resistance index, which allows for a substantial reduction of the fibre consumption. Further, the method of the present disclosure allows for increased production rates. Also, it reduces the top surface roughness. This reduction allows for less calendering, which in turn further improves the bending resistance index.
  • the present disclosure relates to a method of producing a multi-layer paperboard in a paperboard machine (i.e. of full-scale paperboard machine, not a pilot machine).
  • the multi-layer paperboard comprises at least three layers. Consequently, it comprises a first layer, a second layer and a third layer, wherein the second layer is arranged between the first layer and the third layer.
  • the second layer is thus a so-called middle layer.
  • the multi-layer paperboard may comprise more than one middle layer, such as two or three middle layers.
  • the third layer is typically a top layer, e.g. for printing, and the first layer is typically a bottom layer.
  • the method comprises the step of:
  • step a) thus comprises providing the first broke pulp and the second broke pulp.
  • the first and the second broke pulp may be obtained from different broke pulps. However, they are typically obtained from the same broke pulp that is divided into two portions.
  • broke pulp(s) is/are normally (and preferably) obtained from same method as it/they is/are used in.
  • the method further comprises the step of:
  • the dry weight ratio of broke pulp to chemical pulp in the first mixture may for example be between 15:85 and 70:30, preferably between 20:80 and 55:45. Accordingly, the proportion of broke pulp in the first pulp mixture may be 15-70 %, such as 20-55 %, by dry weight.
  • the chemical pulp of step b) is preferably unbleached. However, it may also be bleached. In one embodiment, the chemical pulp of step b) is a kraft pulp.
  • the proportion of softwood pulp in the chemical pulp of step b) is at least 50 %, such as at least 75 %, such as at least 90 %, by dry weight.
  • the chemical pulp of step b) is normally refined even though the method of the present disclosure generally requires less refining than prior art methods.
  • the chemical pulp of step b) may have been subjected to refining to a degree of 20-120 kWh/ton, such as 30-100 kWh/ton.
  • the Schopper-Riegler (SR) number measured according to ISO 5267-1:1999 of the refined chemical pulp of step b) may be below 20, such as below 17, such as 16 or lower.
  • a typical lower limit is 13.
  • the chemical pulp of step b) may comprise a strength agent, such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • a strength agent such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • Step b) is typically carried out in a mixing chest.
  • the method further comprises the step of:
  • the dry weight ratio of the reject fraction to the accept fraction is preferably between 20:80 and 75:25, more preferably between 30:70 and 55:45.
  • the fractionation may for example be carried out by means of one or more screens (see e.g. Fredlund M. et al., "Förbucilitetsegenskaper hos kartong genom fr forceering", STFI-rapport TF 23, Augusti 1996 ; and Grundström K-J, "STFIs silteknik höjer kvaliteten vidissersiell drift", STFI Industri toast, 1995, no. 1, p. 7-8 ).
  • the fractionation is carried out by hydrocyclones (see e.g. Jonas Bergström's Doctoral Thesis "Flow Field and Fibre Fractionation Studies in Hydrocyclones” (1996 )).
  • the average fibre wall thickness is preferably greater in the reject fraction than in the accept fraction.
  • the average fibre wall thickness may for example be measured by a colorimetric-based quantification technology commercialized by PulpEye AB ( ⁇ rnsköldsvik, Sweden) (see also US7289210 B2 ). PulpEye AB has developed a module for fibre wall thickness measurements called the PulpEye Fibre Wall Thickness (FWT) module.
  • the PulpEye FTW module may be acquired for a measurement of an average fibre wall thickness of a sample.
  • the sample may be sent to PulpEye AB for the measurement.
  • the average fibre wall thickness may also be measured by the MorFi wall thickness device that has been developed by CTP and is industrialized and distributed by Techpap.
  • the fines content (%) is preferably higher in the accept fraction than in the reject fraction.
  • the fines content may be defined as the length-weighted proportion of fibres having a length below 0.2 mm. Such a proportion may be measured according to TAPPI T271, e.g. using the equipment kajaaniFS300. In one embodiment, the fines content is at least 50 % higher in the accept fraction than in the reject fraction.
  • shives are defined as fibre bundles having a width above 75 ⁇ m and a length above 0.3 mm.
  • the unit of the shives content is number of shives per gram of dry material (#/g).
  • the shives content is at least 100 % higher, such as at least 150 % higher, in the reject fraction than in the accept fraction.
  • the shives content may for example be measured using a PulpEye equipped with a shives content module.
  • the reject fraction from a fractionation with hydrocyclones typically has a consistency in the range of 1.0-3.5 %.
  • the accept fraction from a fractionation with hydrocyclones typically has a consistency in the range of 0.1-0.4 %.
  • the method further comprises the step of:
  • the second pulp mixture is thus a mixture of the reject fraction and the second broke pulp.
  • the second broke pulp is thus provided in step a).
  • the second pulp mixture is a mixture of the reject fraction and an additional pulp.
  • step a) provides the second broke pulp.
  • the second pulp mixture is a mixture of the reject fraction, the second broke pulp and an additional pulp.
  • the second broke pulp is thus provided in step a).
  • the dry weight ratio of the second broke pulp to the additional pulp may be between 1:4 and 4:1, such as between 1:4 and 1:1.
  • the amount of the reject fraction that is added in the mixing of step d) is preferably such that its proportion in the second pulp mixture is 25-70 %, such as 30-60 %, such as 40-55 %, by dry weight.
  • the additional pulp may be a mechanical pulp, such as chemithermomechanical pulp (CTMP) or thermomechanical pulp (TMP), but it is preferably a chemical pulp.
  • CTMP chemithermomechanical pulp
  • TMP thermomechanical pulp
  • the additional pulp is a chemical pulp, it is preferably provided by the same pulping process as the chemical pulp of step b).
  • the chemical pulp added in the mixing of step d) may have been subjected to less refining than the chemical pulp of step b) or even no refining (since the chemical pulp added in the mixing of step d) will only be used in the second/middle layer).
  • the method comprises the step of dividing a chemical pulp into a first part that becomes the chemical pulp of step b) and a second part that becomes the additional pulp that is added in the mixing of step d).
  • the first part is preferably subjected to more refining (typically measured as kWh/ton) than the second part.
  • the Schopper-Riegler (SR) number is preferably higher for the first part than for the second part.
  • the second pulp mixture may comprise a strength agent, such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • a strength agent such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • Step d) is typically carried out in a mixing chest.
  • the method further comprises the steps of:
  • the first layer is formed from the accept fraction in step f).
  • the accept fraction is not mixed with any other pulp before the first layer is formed.
  • the method may also comprise the step of forming the third layer from a pulp comprising chemical pulp, such as bleached chemical pulp, such as bleached kraft pulp.
  • the pulp used for forming the third layer is a mixture of hardwood pulp and softwood pulp.
  • the pulp used for forming the third layer is preferably refined, e.g. such that it has a higher Schopper-Riegler (SR) number (measured according to ISO 5267-1:1999) than the chemical pulp of step b).
  • SR Schopper-Riegler
  • the pulp used to form the third layer may comprise a strength agent, such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • a strength agent such as starch, e.g. starch in an amount of 5-10 kg/ton dry fibres.
  • the method may further comprise the step of coating the multi-layer paperboard by applying a coating composition, such as a pigment coating composition, onto the third layer, e.g. to further improve the printing properties.
  • a coating composition such as a pigment coating composition
  • the grammage measured according to ISO 536 of the multi-layer paperboard produced by the method is typically between 150 and 500 g/m 2 , such as between 160 and 450 g/m 2 , such as between 170 and 350 g/m 2 . When the grammage is measured, any coating is excluded.
  • high-refined bleached kraft pulp was again used to form a top layer.
  • a first portion of the broke pulp was used for the bottom layer.
  • a (first) mixture of broke pulp (30 %) and refined unbleached kraft pulp (70 %) was prepared and subsequently subjected to fractionation in hydrocyclones. The degree of refining of the refined unbleached was lower than for the high-refined unbleached pulp in the traditional method.
  • the accept fraction from the fractionation was then used to form the bottom layer.
  • the reject fraction from the fractionation was added to a mixing chest.
  • a second portion of the broke pulp and low-refined unbleached kraft pulp were added to the mixing chest in a 1:2 dry weight ratio. The proportion of the reject fraction in the second mixture was 50 %.
  • the bending resistance index of the boards produced with the traditional and the inventive method was measured (see figure 3 ). It was shown that the inventive method increased the bending resistance index by about 9.4 %. Such an increase allows for a reduction of the basis weight by about 2 % (and thus a reduction of the fibre consumption by about 2 %). Further, the basis weight reduction allows for reduced steam consumption in the drying section.
  • the roughness of the top surface of the boards produced with the traditional and the inventive method was measured (see figure 4 ). It was shown that the inventive method decreased the top surface roughness by about 42 %. This was highly surprising as the pulp used for the top layer was the same in the traditional method and the inventive method.
  • Machine trial 2 a traditional method of producing a three-layer paperboard described under Machine trial 1 was compared to an inventive method of producing a three-layer paperboard ("Inventive trial 2").
  • the amount of starch (strength agent) in the middle layer was 8.5 kg/ton as compared to 6.8 kg/ton for the traditional method. Further, the amount of starch (strength agent) in the top layer was 8.0 kg/ton for Inventive trail 2 as compared to 6.0 kg/ton for the traditional method. The reason for increasing the amount of starch was to maintain the z direction strength when the composition of the middle layer was altered.
  • the reject fraction from the fractionation was added to a mixing chest. Further, a second portion of the broke pulp and low-refined unbleached kraft pulp were added to the mixing chest in a 1:2 ratio. Even though the degree of refining was reduced for the unbleached kraft pulp used for the bottom layer, it was still higher than the degree of refining of the unbleached kraft pulp used exclusively for the middle layer (i.e. low-refined unbleached kraft pulp).
  • the roughness of the top surface of the board was decreased significantly by the Inventive trial 2 as compared to the traditional method. This allowed for a successive reduction of the line load in a pre-calender from 20 kN/m to 12 kN/m (see figure 5 ). At 12 kN/m, the surface roughness was still slightly lower than for the traditional method that used 20 kN/m. The line load reduction from 20 to 12 kN/m further improved the bending resistance index by about 8 % (see figure 6 ). In total, Inventive trial 2 decreased the basis weight by about 8 g/m 2 (corresponding to a reduction of the fibre consumption by almost 3 %) compared to the traditional method (see figure 7 ) without any negative impact on surface roughness or bending resistance. At the same time, Inventive trial 2 allowed for an increased production by almost 15 %, i.a. because the Inventive trial 2 consumes less steam per ton of produced board and allows for quicker dewatering.
  • a mixture of broke pulp and chemical pulp i.e. a "first pulp mixture” according to the present disclosure, referred to as "inject” below
  • inject was fractionated using hydrocyclones into a accept fraction and a reject fraction.

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  • General Chemical & Material Sciences (AREA)
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Claims (15)

  1. Verfahren zur Herstellung eines mehrlagigen Kartons, der eine erste Lage, eine zweite Lage und eine dritte Lage umfasst, wobei die zweite Lage zwischen der ersten Lage und der dritten Lage angeordnet ist, wobei das Verfahren die Schritte umfasst:
    a) Bereitstellen eines ersten Ausschussfaserstoffs und optional eines zweiten Ausschussfaserstoffs;
    b) Mischen des ersten Ausschussfaserstoffs mit einem chemisch aufgeschlossenen Zellstoff, um ein erstes Faserstoffgemisch zu erhalten;
    c) Fraktionieren des erste Faserstoffgemischs, um eine Spuckstoff-Fraktion und eine Gutstoff-Fraktion zu erhalten;
    d) Mischen der Spuckstoff-Fraktion mit dem zweiten Ausschussfaserstoff und/oder einem zusätzlichen Faserstoff, um ein zweites Faserstoffgemisch zu erhalten;
    e) Ausbilden der zweiten Lage aus dem zweiten Faserstoffgemisch; und
    f) Ausbilden der ersten Lage aus einem Faserstoff, der die Gutstoff-Fraktion umfasst.
  2. Verfahren nach Anspruch 1, wobei Schritt a) umfasst: Teilen eines Ausschussfaserstoffs in eine erste Teilmenge, die der erste Ausschussfaserstoff ist, und eine zweite Teilmenge, die der zweite Ausschussfaserstoff ist.
  3. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Zellstoff von Schritt b) ungebleicht ist.
  4. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Zellstoff von Schritt b) Kraftzellstoff ist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, wobei der zusätzliche Faserstoff durch das gleiche Aufschlussverfahren wie der Zellstoff von Schritt b) bereitgestellt wird.
  6. Verfahren nach Anspruch 5, ferner umfassend den Schritt: Teilen eines Zellstoffs in einen ersten Teil, der zu dem Zellstoff von Schritt b) wird, und einen zweiten Teil, der zu dem zusätzlichen Faserstoff wird, der beim Mischen von Schritt d) zugegeben wird.
  7. Verfahren nach Anspruch 6, wobei mindestens der erste Teil so gemahlen wird, dass der nach ISA 5267-1:1999 gemessene Schopper-Riegler-Mahlgrad (SR-Zahl) für den Zellstoff von Schritt b) höher ist als für den zusätzlichen Faserstoff, der beim Mischen von Schritt d) zugegeben wird.
  8. Verfahren nach einem der vorhergehenden Ansprüche, wobei der gemäß ISA 5267-1:1999 gemessene Schopper-Riegler-Mahlgrad (SR-Zahl) des Zellstoffs von Schritt b) weniger als 20, wie zwischen 13 und 17, beträgt.
  9. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Trockengewichtsverhältnis der Spuckstoff-Fraktion zur Gutstoff-Fraktion zwischen 20:80 und 75:25, wie zwischen 30:70 und 55:45, liegt.
  10. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Fraktionierung von Schritt c) eine Fraktionierung in Hydrozyklonen umfasst.
  11. Verfahren nach einem der vorhergehenden Ansprüche, wobei der Anteil der Spuckstoff-Fraktion im zweiten Faserstoffgemisch 25-70 %, wie 30-60 %, wie 40-55 %, bezogen auf Trockengewicht, beträgt.
  12. Verfahren nach einem der vorhergehenden Ansprüche, wobei die dritte Lage aus einem Faserstoff ausgebildet wird, der Zellstoff, wie gebleichten Zellstoff, umfasst.
  13. Verfahren nach einem der vorhergehenden Ansprüche, wobei die dritte Lage eine Decklage zum Bedrucken ist und die erste Lage eine untere Lage ist.
  14. Verfahren nach Anspruch 12, ferner umfassend den Schritt: Streichen des mehrlagigen Kartons durch Auftragen einer Streichmasse, wie einer Pigmentstreichmasse, auf die Decklage.
  15. Verfahren nach einem der vorhergehenden Ansprüche, wobei die gemäß ISO 536 gemessene Grammatur des mehrlagigen Kartons zwischen 150 und 500 g/m2, wie zwischen 160 und 450 g/m2, wie zwischen 170 und 350 g/m2 liegt.
EP17209806.3A 2017-12-21 2017-12-21 Faserfraktionierung Active EP3502348B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP17209806.3A EP3502348B1 (de) 2017-12-21 2017-12-21 Faserfraktionierung
PCT/EP2018/085408 WO2019121625A1 (en) 2017-12-21 2018-12-18 Fibre fractionation
CN201880081658.6A CN111511988B (zh) 2017-12-21 2018-12-18 纤维分提

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17209806.3A EP3502348B1 (de) 2017-12-21 2017-12-21 Faserfraktionierung

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EP3502348A1 EP3502348A1 (de) 2019-06-26
EP3502348B1 true EP3502348B1 (de) 2020-06-24

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AT524998B1 (de) * 2021-04-21 2023-02-15 Mondi Ag Bedruckbares, mehrlagiges Papier für Verpackungen und Verfahren zu dessen Herstellung

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US5916417A (en) * 1997-08-22 1999-06-29 International Paper Company Method of making multi-ply paperboard sheet having layers of different fiber properties
SE513596C2 (sv) * 1999-02-22 2000-10-09 Stora Kopparbergs Bergslags Ab Metod vid tillverkning av papper eller kartong
FI116908B (fi) * 2002-06-11 2006-03-31 Metso Paper Inc Menetelmä massan fraktioimiseksi ja syöttämiseksi monikerrosperälaatikkoon
CN1711395A (zh) * 2002-11-01 2005-12-21 国际纸业公司 分层纸张的制造方法
FI115234B (fi) * 2003-09-24 2005-03-31 Metso Paper Inc Menetelmä kerrostetun paperi- tai kartonkirainan valmistamiseksi
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FI119062B (fi) * 2006-12-28 2008-07-15 Upm Kymmene Corp Menetelmä mekaanisen massan valmistamiseksi
US20080308239A1 (en) * 2007-06-12 2008-12-18 Hart Peter W Fiber blend having high yield and enhanced pulp performance and method for making same
WO2008153565A1 (en) * 2007-06-12 2008-12-18 Meadwestvaco Corporation A fiber blend having high yield and enhanced pulp performance and method for making same
EP2199459A1 (de) * 2008-12-16 2010-06-23 Voith Patent GmbH Blattbildungssystem für eine Maschine zur Herstellung einer mehrschichtigen Faserstoffbahn
DE102010029617A1 (de) * 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
SE539344E (en) * 2015-03-02 2020-02-11 Billerudkorsnaes Ab Pulp mixture for production of a paper product with high strength in z-direction
SE1550985A1 (sv) * 2015-07-07 2016-09-06 Stora Enso Oyj Shaped tray or plate of fibrous material and a method of manufacturing the same

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EP3502348A1 (de) 2019-06-26
WO2019121625A1 (en) 2019-06-27
CN111511988B (zh) 2022-09-27
CN111511988A (zh) 2020-08-07

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