EP4575084A1 - Verfahren zur herstellung einer mehrlagigen pappe - Google Patents

Verfahren zur herstellung einer mehrlagigen pappe Download PDF

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Publication number
EP4575084A1
EP4575084A1 EP23218168.5A EP23218168A EP4575084A1 EP 4575084 A1 EP4575084 A1 EP 4575084A1 EP 23218168 A EP23218168 A EP 23218168A EP 4575084 A1 EP4575084 A1 EP 4575084A1
Authority
EP
European Patent Office
Prior art keywords
ply
paperboard
web
ply web
water
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
EP23218168.5A
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English (en)
French (fr)
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EP4575084C0 (de
EP4575084B1 (de
Inventor
Magnus HAGELQVIST
Adam ATTEMALM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Billerud AB
Original Assignee
Billerud AB
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by Billerud AB filed Critical Billerud AB
Priority to EP23218168.5A priority Critical patent/EP4575084B1/de
Priority to PL23218168.5T priority patent/PL4575084T3/pl
Priority to PCT/EP2024/082847 priority patent/WO2025131501A1/en
Publication of EP4575084A1 publication Critical patent/EP4575084A1/de
Application granted granted Critical
Publication of EP4575084C0 publication Critical patent/EP4575084C0/de
Publication of EP4575084B1 publication Critical patent/EP4575084B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • Paperboards are commonly made of one ply or out of two or more plies, wherein the latter is referred to as multi-plied paperboards. Multi-plied paperboards are used in for example packaging due to their mechanical properties.
  • One objective is to make available a method which provides a multi-plied paperboard of high strength with a decreased cost in a full-scale paperboard machine.
  • the present disclosure provides a method of forming a multi-ply paperboard comprising at least a first ply and a second ply in a full-scale paperboard machine, wherein the method comprises the following steps:
  • the first ply web and second ply web are formed in the wire section of the paperboard machine.
  • the webs are thereby provided on individual forming wires from individual headboxes.
  • the water is substantially free of bonding chemicals.
  • the water is preferably free of at least the bonding chemicals starch, microfibrillated cellulose (MFC) and carboxymethyl cellulose (CMC).
  • bonding chemicals is meant substances that improves the ply-bond strength in a multi-ply paperboard. For the avoidance of doubt, this does not include starch added to any of the furnishes upstream the headboxes, i.e. to the furnishes.
  • the strength of the plies may be further improved by addition of starch to the furnishes.
  • Starch is preferably added in an amount of 1.5-7.0 kg/tonne based on dry weight of the furnishes, such as 2.0-6.0 kg/tonne based on dry weight of the furnishes.
  • the water is typically sprayed in an amount of at least 35 g/m 2 onto a surface of the first ply web or second ply web to obtain a wetted surface in the wire section.
  • the amount of sprayed water may be even higher, such as at least 40 g/m 2 , such as at least 45 g/m 2 .
  • the water is sprayed evenly over the surface of the first ply web or second ply web.
  • One way of spraying the water evenly is to use nozzles from Spraying Systems AB of model H-U-9515.
  • the first ply web and the second ply web are dewatered to a dry content of below 30 % prior to the spraying of water. For example, by passing the webs over suction boxes to be partially dewatered.
  • the inventors have realized that it is enough with application of water in an amount according to the present disclosure on the first ply web or second ply web also if the plies have been partially dewatered to provide satisfactory mechanical properties in the z-direction.
  • suction boxes are typically arranged in a position downstream of the headbox in a full-scale board machine and to provide a homogenous moisture content of the webs these has to be disconnected or turned off, which in turn would cause issues with for example dewatering downstream in the production process.
  • the wetted surface is merged with a surface of the other web by couching.
  • Couching is a process well-known to the skilled person in which the webs are pressed together prior to final drying to adhere one another.
  • the couching is typically conducted at a temperature of below 50 °C, such as below 40 °C. Accordingly, the couching is not the same principle as heat pressing, and it is advantageous of such process in terms of energy efficiency.
  • the inventors have realized that there is no need to supply external heat to bind the wetted surface to the other web by the spraying of the water.
  • the different plies adhere so that the mechanical properties, in particular in the z-direction, are satisfactory. Moreover, if the adhesion between the plies, i.e. the ply-bond strength, is unsatisfactory, it may also cause the outer plies to at least partially lift from the middle pl(y/ies) which give rise to surface defects amongst other drawbacks.
  • the moisture content of web with the wetted surface is increased by 0.5-2.0 %.
  • Moisture content of the webs can be measured online by for example a near-IR (NIR) sensor.
  • the increase in moisture is measured by measuring the moisture before and after the spraying of water.
  • the first ply web may comprise chemical pulp.
  • a preferred type of chemical pulp is kraft pulp, such as softwood kraft pulp.
  • the proportion of chemical pulp in the first ply web is 15-80% by dry weight, such as 15-50% by dry weight. Inclusion of kraft pulp in the first ply web is beneficial in terms of strength properties.
  • the first ply web may comprise chemithermomechanical pulp (CTMP).
  • CTMP is a bulky mechanical pulp.
  • the CTMP may be bleached or unbleached. Even though the CTMP is a relatively weak type of pulp, the inclusion of chemical pulp balances the strength as the chemical pulp is a relatively strong type of pulp.
  • the first ply web also comprises chemical pulp. It is beneficial to include CTMP in the first ply web as it decreases the density, i.e. increases the bulk, of the paperboard. A high bulk is preferred as less fibres are used per gram of paperboard.
  • CTMP also includes high-temperature chemithermomechanical pulp (HT-CTMP).
  • the first ply web comprises chemithermomechanical pulp (CTMP)
  • CTMP is provided in a proportion of 0-45% by dry weight, such as 0-40% by dry weight.
  • the first ply web typically forms a middle ply in the multi-ply paperboard.
  • the second ply web typically forms a top ply in the multi-ply paperboard.
  • the inventors realized that if water substantially free from bonding chemicals according to the present disclosure is sprayed, the mechanical properties in z-direction, e.g. said ZD tensile strength and Scott Bond, are provided at least of a similar level as when a regular amount of ply-bond starch is applied between the plies, which typically is higher, e.g. about 1 g/m 2 or more.
  • the inventors have realized that when measuring the z-directional property Scott Bond value of multi-plied paperboards having at least three plies, the failure typically occurs in or near the interface of the top ply and the middle ply or in or near the interface of the back ply and the middle ply. In case the failure typically occurs in or near the interface of the top ply and the middle ply, the conclusion was made that there is a higher importance to provide a strong interface between the top ply and middle ply to provide a multi-plied paperboard having good z-direction (ZD) tensile strength as well as Scott Bond values. This was the case for the multi-plied paperboards produced on the paperboard machine used in the experimental section of the present disclosure.
  • ZD z-direction
  • the internal bond strength, Scott Bond, according to Tappi T 569, of the multi-plied paperboard is typically at least 175 J/m 2 , such as at least 190 J/m 2 .
  • the z-directional (ZD) tensile strength according to Tappi T 541 of the multi-plied paperboard is typically at least 230 kPa, such as at least 300 kPa, such as at least 330 kPa.
  • the first ply web may comprise broke pulp.
  • the proportion of broke pulp in the first ply furnish is typically 20-60% by dry weight, such as 25-50% by dry weight.
  • a suitable Schopper-Riegler (SR) number for the broke pulp is °20-°40, such as °22-°38.
  • SR number may be obtained by adapting the degree of refining of the broke pulp.
  • the SR number is measured according to ISO 5267-1:1999.
  • the broke pulp in the first ply furnish has been refined with 15-50 kWh/t to provide the particular SR number.
  • the broke pulp is typically obtained from the method of the present disclosure, which means that it has the same fibre composition as the multi-plied paperboard.
  • the density according to ISO 534:2011 of the multi-ply paperboard is typically 680-820 kg/m 3 , such as 690-810 kg/m 3 , such as 690-780 kg/m 3 .
  • the grammage according to ISO 536:2020 of the multi-ply paperboard is typically 130-500 g/m 2 , such as 150-480 g/m 2 .
  • the thickness according to ISO 534:2011 of the multi-ply paperboard is typically 220-800 ⁇ m, such as 250-750 ⁇ m.
  • Paperboard 1 In a full-scale paperboard machine, a 3-ply paperboard was produced from a top ply furnish, a middle ply furnish and a back ply furnish. This composition of the paperboard is referred to as "Paperboard 1". Paperboard 1 was produced in two different baseboard grammages: 175 g/m 2 (“Paperboard 1a”) and 248 g/m 2 (“Paperboard 1b"). The paperboards were thereafter coated with a coat weight of 19 g/m 2 .
  • top ply furnish, middle ply furnish and back ply furnish were each provided from separate headboxes on separate forming wires to provide a top ply web, a middle ply web and a back ply web.
  • water was sprayed. Thereafter, the top ply web and middle ply web were combined by couching.
  • the amount of sprayed water was kept constant at about 25 g/m 2 (Reference; IE) for paperboard 1a and varied from about 25 g/m 2 (Reference) to about 40 g/m 2 (Inventive Example (IE)) for paperboard 1b (Inventive Example (IE)).
  • the sprayed water on the top side of the back ply web is presented in Figs. 3 & 4 .
  • Fig. 3 the sprayed water on the top side of the back ply in paperboard 1a is presented and in Fig. 4 the sprayed water on the top side of the back ply in paperboard 1b is presented.
  • Fig. 7 the z-directional (ZD) tensile strength measured according to TAPPI T 541 are presented for the paperboard 1a and in Fig. 8 for paperboard 1b.
  • the ZD tensile strength did not decrease by the reduction in sprayed starch. Instead, it was remained at about the same level as when the starch was sprayed.
  • the furnishes contained softwood kraft pulp (SW kraft), hardwood kraft pulp (HW kraft), chemithermomechanical pulp (CTMP) and broke pulp as presented in Table 2 below.
  • Table 2. Composition of each ply in Paperboards 2-4. Paperboard Paperboard grammage Top ply composition (% by dry weight) Middle ply composition (% by dry weight) Back ply composition (% by dry weight) 2 150-295 g/m2 65-75% HW kraft/25-35% SW kraft 15% SW kraft/ 40% CTMP/ 45% broke pulp 100% SW kraft 3 155-210 g/m2 70% HW kraft/ 30% SW kraft 0-10% SW kraft/ 45% CTMP/ 45-55% broke pulp 80% SW kraft/ 20% broke pulp 4 140-205 g/m2 25% SW kraft/ 75% HW kraft 55% CTMP/ 45% broke pulp 100 % SW kraft
  • the amount of sprayed water was the same as for paperboard 1, i.e. for the reference the amount was about 25 g/m 2 and for the examples with reduced or no starch the amount was about 45 g/m 2 or 65 g/m 2 depending on paperboard grammage. Paperboards having lower grammages, around 175 g/m 2 were sprayed with 45 g/m 2 water, while paperboards having higher grammages, around 248 g/m 2 were sprayed with 65 g/m 2 water.
  • Paperboard Starch addition on back side of the top ply web Z-directional mechanical properties 2a About 1 g/m 2 Reference 2b About 0 g/m 2 About the same as the reference 3a About 1 g/m 2 Reference 3b
  • Estimated possible starch addition About 0.3 g/m 2 About the same as the reference* 3c About 0 g/m 2
  • Estimated to be slightly lower than reference* 4a About 1.0 g/m 2 Reference 4b About 0 g/m 2 Not satisfactory
  • Estimated based on that 55% CTMP (paperboard 4) provides unsatisfactory z-directional mechanical properties without starch and that 40% CTMP (paperboard 2) provides similar z-directional mechanical properties with and without sprayed starch.

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  • Paper (AREA)
EP23218168.5A 2023-12-19 2023-12-19 Verfahren zur herstellung einer mehrlagigen pappe Active EP4575084B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP23218168.5A EP4575084B1 (de) 2023-12-19 2023-12-19 Verfahren zur herstellung einer mehrlagigen pappe
PL23218168.5T PL4575084T3 (pl) 2023-12-19 2023-12-19 Sposób wytwarzania tektury wielowarstwowej
PCT/EP2024/082847 WO2025131501A1 (en) 2023-12-19 2024-11-19 Method for production of a multi-ply paperboard

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23218168.5A EP4575084B1 (de) 2023-12-19 2023-12-19 Verfahren zur herstellung einer mehrlagigen pappe

Publications (3)

Publication Number Publication Date
EP4575084A1 true EP4575084A1 (de) 2025-06-25
EP4575084C0 EP4575084C0 (de) 2025-11-12
EP4575084B1 EP4575084B1 (de) 2025-11-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP23218168.5A Active EP4575084B1 (de) 2023-12-19 2023-12-19 Verfahren zur herstellung einer mehrlagigen pappe

Country Status (3)

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EP (1) EP4575084B1 (de)
PL (1) PL4575084T3 (de)
WO (1) WO2025131501A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011056135A1 (en) * 2009-11-06 2011-05-12 Stora Enso Oyj Process for the production of a paper or board product and a paper or board produced according to the process
WO2022003423A1 (en) * 2020-07-03 2022-01-06 Essity Hygiene And Health Aktiebolag Coreless rolls of a tissue paper product and methods of manufacturing coreless rolls
WO2023062557A1 (en) * 2021-10-13 2023-04-20 Stora Enso Oyj Method for manufacturing a multiply paperboard, and a multiply paperboard
WO2023198916A1 (en) * 2022-04-14 2023-10-19 Billerud Aktiebolag (Publ) Production of paper- or linerboard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011056135A1 (en) * 2009-11-06 2011-05-12 Stora Enso Oyj Process for the production of a paper or board product and a paper or board produced according to the process
WO2022003423A1 (en) * 2020-07-03 2022-01-06 Essity Hygiene And Health Aktiebolag Coreless rolls of a tissue paper product and methods of manufacturing coreless rolls
WO2023062557A1 (en) * 2021-10-13 2023-04-20 Stora Enso Oyj Method for manufacturing a multiply paperboard, and a multiply paperboard
WO2023198916A1 (en) * 2022-04-14 2023-10-19 Billerud Aktiebolag (Publ) Production of paper- or linerboard

Also Published As

Publication number Publication date
EP4575084C0 (de) 2025-11-12
PL4575084T3 (pl) 2026-03-23
EP4575084B1 (de) 2025-11-12
WO2025131501A1 (en) 2025-06-26

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