EP2617895B1 - Verfahren in einem Mehrrollenkalender - Google Patents

Verfahren in einem Mehrrollenkalender Download PDF

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Publication number
EP2617895B1
EP2617895B1 EP12151578.7A EP12151578A EP2617895B1 EP 2617895 B1 EP2617895 B1 EP 2617895B1 EP 12151578 A EP12151578 A EP 12151578A EP 2617895 B1 EP2617895 B1 EP 2617895B1
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EP
European Patent Office
Prior art keywords
calender
stack
rolls
web
roll
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.)
Not-in-force
Application number
EP12151578.7A
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English (en)
French (fr)
Other versions
EP2617895A1 (de
Inventor
Tommi Vanhala
Krista Nukarinen
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.)
Valmet Technologies Oy
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Valmet Technologies Oy
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Publication date
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Priority to EP12151578.7A priority Critical patent/EP2617895B1/de
Priority to CN201310018654.2A priority patent/CN103215841B/zh
Publication of EP2617895A1 publication Critical patent/EP2617895A1/de
Application granted granted Critical
Publication of EP2617895B1 publication Critical patent/EP2617895B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • present invention relates to a method for multiroll calendering according to preamble part of claim 1.
  • Calendering is generally carried out in order to improve the properties, like smoothness and gloss, of a web-like material such as a paper or board web.
  • a web-like material such as a paper or board web.
  • the web is passed into a nip, i.e. calendering nip, formed between rolls that are pressed against each other, in which nip the web becomes deformed as by the action of temperature, moisture and nip pressure.
  • the nips are formed between a smooth-surfaced press roll such as metal roll and a roll coated with resilient material such as a polymer roll.
  • the resilient-surfaced roll adjusts itself to the forms of the web surface and presses the opposite side of the web evenly against the smooth-surfaced press roll.
  • Multinip, or multiroll calendering is calendering in a calendering unit, in which the nips are formed between a smooth-surfaced press roll such as metal roll and a roll coated with resilient material such as a polymer roll and the linear load increases in multinip calenders from the upper nip to the lower nip due to gravitation, unless roll relies systems are used.
  • multiroll calenders are known, in which the set of rolls of which is formed of two stacks of rolls, each stack of rolls comprising at least two calender rolls.
  • Multinip or multiroll calender are known for example by brand names OptiLoad and TwinLine.
  • FI patent 96334 is disclose a method for calendering a paper or an equivalent web material in a calender in which method the web to be calendered is passed through nips formed by a deflection-compensated upper roll and a deflection-compensated lower roll, and by two or more intermediate rolls arranged between the upper and lower roll. The rolls are arranged as a substantially vertical stack of rolls.
  • a fiber web is calendered in a multi roll calender comprising two stacks of rolls, both stacks comprising at least two calender rolls.
  • at least one intermediate roll is locked to a lower position whereby loading the rolls above or below the locked roll, a required number of calendering nips can be provided for use.
  • this prior art publication also various ways of guiding the web to be calendered through the calendering nips of the calender roll stacks is disclosed but the running direction of the web is always same in each stack of the calender during calendering in each configuration.
  • WO 2007/082986 is disclosed a calendering method by which both glossy fiber web grades and high matte-surface fiber web grades are calendered in the same multiroll calender by using calendering nips in reverse order for glossy grades and for matte grades.
  • the line between paper and board is flexible and paper and board are available in a wide variety of grades and can be divided according to basis weight in two categories: papers with a single ply and a basis weight of 25 - 300 g/ m 2 and boards manufactured in multi-ply technology and having a basis weight of 150 - 600 g/ m 2 . It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
  • Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
  • Newsprint is composed either completely of mechanical pulp or may contain some bleached softwood pulp (0 - 15 %) and/or recycled fiber to replace some of the mechanical pulp.
  • General values for newsprint can be regarded as follows: basis weight 40 - 48,8 g/m 2 , ash content (SCAN-P 5:63) 0 - 20 %, PPS s10 roughness (SCAN-P 76:95) 3,0 - 4,5 ⁇ m, Bendtsen roughness (SCAN-P 21:67) 100 - 200 ml/min, density 200 - 750 kg/m 3 , brightness (ISO 2470:1999) 57 - 63 %, and opacity (ISO 2470:1998) 90 - 96 %.
  • Uncoated magazine paper usually contains mechanical pulp to 50 - 70 %, bleached softwood pulp to 10 - 25 %, and fillers to 15 - 30%.
  • Typical values for calendered SC paper containing e.g. SC-C, SC-B.
  • SC-A/A+ include basis weight 40 - 60 g/m 2 , ash content (SCAN-P 5:63) 0 - 35 %, Hunter gloss (ISO/DIS 8254/1) ⁇ 20 - 50 %, PPS s10 roughness (SCAN-P 76:95) 1,2 - 2,5 ⁇ m, Bendtsen roughness (SCAN-P 21:67) 100 - 200 ml/min, density 700 - 1250 kg/m 3 , brightness (ISO 2470:1999) 62 - 70 %, and opacity (ISO 2470:1998) 90-95%.
  • General values for LWC paper can be regarded as follows: basis weight 40 - 70 g/m 2 , Hunter gloss 50 - 65 %, PPS s10 roughness 0,8 - 1,5 ⁇ m (offset), 0,6 - 1,0 ⁇ m (roto), density 1100 - 1250 kg/m 3 , brightness 70 - 75 %, and opacity 89 - 94 %.
  • MFC machine finished coated
  • basis weight 50 - 70 g/m 2 Basis weight 50 - 70 g/m 2 , Hunter gloss 25 - 70 %, PPS s10 roughness 2,2 - 2,8 ⁇ m, density 900 - 950 kg/m 3 , brightness 70 - 75 %, and opacity 91 - 95 %.
  • FCO film coated offset
  • MWC medium weight coated
  • basis weight 70 - 90 g/m 2 Basis weight 70 - 90 g/m 2 , Hunter gloss 65 - 75 %, PPS s10 roughness 0,6 - 1,0 ⁇ m, density 1150 - 1250 kg/m 3 , brightness 70 - 75 %, and opacity 89 - 94 %.
  • HWC (heavy weight coated) has a basis weight of 100 - 135 g/m 2 and can be coated even more than twice.
  • Pulp-produced, wood free printing papers or fine papers include uncoated - and coated - pulp-based printing papers, in which the portion of mechanical pulp is less than 10 %.
  • Uncoated pulp-based printing papers contain bleached birchwood pulp to 55 - 80 %, bleached softwood pulp 0 - 30 %, and fillers to 10 -30 %.
  • the values with WFU have a large variation: basis weight 50 - 90 g/m 2 , Bendtsen roughness 250 -400 ml/min, brightness 86 - 92 %, and opacity 83 - 98 %.
  • WFC coated pulp-based printing papers
  • the amounts of coating vary widely in accordance with requirements and intended application, the following are typical values for once- and twice-coated, pulp-based printing paper: once-coated basis weight 90 g/m 2 , Hunter gloss 65 - 80 %, PPS s10 roughness 0,75 - 2,2 ⁇ m, brightness 80 - 88 %, and opacity 91 - 94 %, and twice-coated basis weight 130 g/m 2 , Hunter gloss 70 - 80 %, PPS s10 roughness 0,65 -0,95 ⁇ m, brightness 83 - 90 %, and opacity 95 - 97 %.
  • Release papers have a basis weight within the range of 25 - 150 g/m 2 .
  • Other papers include e.g. sackkraft papers, tissues, and wallpaper bases.
  • Board making makes use of chemical pulp, mechanical pulp and/or recycled pulp.
  • Graphic boards used for making e.g. cards, files, folders, cases, covers, etc. and Wallpaper bases.
  • An object of the present invention is to create a method for multiroll calendering in which grade change of fiber web is easily applicable.
  • One aim is to achieve high capacity of the production line thus it is very important to minimize down times of machinery of the line.
  • One object of the invention is providing means for minimizing maintenance time of a multiroll calender.
  • Another object of the present invention is to achieve a method in which possible disadvantages and problems of known methods and calenders are eliminated or at least minimized.
  • a method for multiroll calendering wherein the running direction of the fiber web to be calendered can be changed in at least one calender roll stack for calendering a different grade of fiber web.
  • the upper side of the web to be calendered is in contact with a thermo roll in the first stack of calender rolls and the lower side of the web is in contact with a thermo roll in the second stack of calender rolls and in second running direction of the at least one stack of calender rolls the upper side of the web to be calendered is in contact with a thermo roll in the first stack of calender rolls and the upper side of the web is in contact with a thermo roll in the second stack of calender rolls so that by using the first running direction two-sided fiber web grade can be produced and by using the second running direction one-sided fiber web grade can be produced.
  • the lower side of the web to be calendered is in contact with a thermo roll in the first stack of calender rolls and the upper side of the web is in contact with a thermo roll in the second stack of calender rolls and in second running direction of the at least one stack of calender rolls the lower side of the web to be calendered is in contact with a thermo roll in the first stack of calender rolls and the lower side of the web is in contact with a thermo roll in the second stack of calender rolls so that by using the first running direction two-sided fiber web grade can be produced and by using the second running direction one-sided fiber web grade can be produced.
  • the invention also provides for possibility of using one stack of calender rolls for production while other stack of calender stack is under maintenance.
  • a fiber web grade that has basis weight of 40 -150 g/m 2 is calendered and in the method fiber web is calendered to surface roughness of 0,6 - 4,5 ⁇ m PPs.
  • the fiber web is calendered in a multiroll calender comprising at least two stacks of at least four calender rolls.
  • the calender roll refers to rolls that form the calendering nip
  • upper roll refers to the uppermost roll in a stack of rolls
  • upper nip refers to the uppermost calendering nip, formed between the upper roll and the calender roll below the upper roll
  • lower roll refers to the lowest roll in a stack of rolls
  • lower nip refers to the lowest calendering nip in a stack of rolls, which lowest calendering nip is formed between the lower roll and the calender roll above the lower roll.
  • Intermediate nips refer to calender nips formed by means of calender rolls between the rolls between the upper nip and the lower nip of a calender.
  • upper roll / uppermost calendering nip refers to first nip roll / first nip of the calendering process and the lower roll / lowest calendering nip to the last roll / last nip of the calendering process.
  • the stack of rolls can be vertical or inclined or horizontal.
  • the calender can comprise one stack of rolls or more stacks of rolls, for example two stacks of rolls.
  • the stacks of rolls may or may not have common support frame.
  • the running direction of the web defines the side of the web to be calendered in the calendering nips i.e. which side of the web will be in contact with the smooth-surfaced calender rolls.
  • figure 1 one example of a multiroll calender is schematically shown with one example of running direction.
  • fiber web W is guided in the multiroll calender example of figure 1 with another running direction in second stack of calender rolls.
  • fiber web W is guided in the multiroll calender example of figure 3 with another running direction in second stack of calender rolls.
  • FIGS 1 - 4 schematically show examples of multiroll calenders with two stacks of calender rolls.
  • Multiroll calender 10 shown in figures comprises two stacks of calender rolls 20, 30, in which a fiber web W is calendered in the calendering nips between the calender rolls of the stacks of calender rolls.
  • Reference numerals 21 - 25 refer to those of first stack of calender rolls and reference numerals 31 - 35 to those of second stack of calender rolls.
  • By reference sign A after the reference numeral a calender roll that is a resilient-surfaced calender roll is indicated and by reference sign B after the reference numeral a calender roll that is a smooth-surfaced calender roll.
  • Resilient-surfaced calender rolls are soft-surfaced, for example polymer-surfaced deflection, rolls and smooth-surfaced rolls are metal rolls, or thermo rolls either heatable and/or coolable rolls.
  • FIG. 1 and 2 a multiroll calender 10 with two stacks of calender rolls 20, 30 is shown.
  • the two stacks 20, 30 are located next to each other and a multiroll calender corresponding to the brand TwinLine is presented.
  • the uppers rolls 21, 31 of each stack are deflection compensated rolls.
  • Rolls 22B, 32B, 24B, 25B are thermo rolls and rolls 23A, 33A are resilient-surfaced polymer rolls.
  • Lower roll 25, 35 of each stack is a deflection compensated roll.
  • the running direction of the web has been changed for grade change of fiber web.
  • a two-sided fiber web grade for example wood free coated (WFC)
  • WFC wood free coated
  • a one-sided fiber web grade for example release
  • the upper side of the web W is in contact with thermo rolls 22B, 24B in the first stack of calender rolls 20 and the lower side of the web is in contact with thermo rolls 32B, 34B in the second stack of calender rolls 30.
  • the running direction has been changed for grade change and in the first stack of calender rolls 20 and again the upper side of the web is in contact with thermo rolls 32B, 34B in the second stack of calender rolls 30.
  • a multiroll calender 10 with two stacks of calender rolls 20, 30 is shown.
  • the two stacks 20, 30 are located on top of each other and a multiroll calender corresponding to the brand OptiLoad is presented.
  • the uppers rolls 21, 31 of each stack are deflection compensated rolls.
  • Rolls 22B, 32B, 24B, 25B are thermo rolls and rolls 23A, 33A are resilient-surfaced polymer rolls.
  • Lower rolls 25, 35 of each stack are deflection compensated rolls.
  • a two-sided fiber web grade for example wood free coated (WFC)
  • WFC wood free coated
  • a one-sided fiber web grade for example release
  • the web is calendered from top to bottom via calendering nips of both stacks of calendering rolls 20, 30 and the lower side of the web W is in contact with thermo rolls 22B, 24B in the first stack of calender rolls 20 and the upper side of the web is in contact with thermo rolls 32B, 34B in the second stack of calender rolls 30.

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  • Paper (AREA)

Claims (1)

  1. Verfahren zur Mehrwalzenkalandrierung, wobei in dem Verfahren eine Faserbahn, insbesondere eine Papier- oder Kartonbahn (W), in einem Mehrwalzenkalender (10) kalandriert wird, der wenigstens zwei Stapel (20, 30) von Kalenderwalzen aufweist, wobei jeder Stapel wenigstens vier Kalenderwalzen aufweist, wobei in dem Verfahren die Laufrichtung der zu kalendrierenden Faserbahn (W) in dem Mehrwalzenkalender in wenigstens einem Kalenderwalzenstapel (20, 30) zum Kalendrieren einer unterschiedlichen Sorte der Faserbahn gewechselt werden kann, und die Faserbahn auf eine Sorte kalendriert wird, die ein Riesgewicht von 40 bis 150 g/m2 und eine Oberflächenrauigkeit von 0,6 bis 4,5 µm PPs aufweist,
    dadurch gekennzeichnet, dass
    in der ersten Laufrichtung des wenigstens einen Stapels (20) von Kalenderwalzen die obere Seite der zu kalendrierenden Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem ersten Stapel (20) von Kalenderwalzen ist und die untere Seite der Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem zweiten Stapel (30) von Kalenderwalzen ist, und in der zweiten Laufrichtung des wenigstens einen Stapels (20) von Kalenderwalzen die obere Seite der zu kalendrierenden Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem ersten Stapel (20) von Kalenderwalzen ist und die obere Seite der Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem zweiten Stapel (30) von Kalenderwalzen ist, so dass durch Verwenden der ersten Laufrichtung eine zweiseitige Faserbahnsorte produziert werden kann, oder in der ersten Laufrichtung des wenigstens einen Stapels (20) von Kalenderwalzen die untere Seite der zu kalendrierenden Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem ersten Stapel (20) von Kalenderwalzen ist und die obere Seite der Bahn in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem zweiten Stapel (30) von Kalenderwalzen ist, und in der zweiten Laufrichtung des wenigstens einen Stapels (20) von Kalenderwalzen die untere Seite der zu kalendrierenden Bahn in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem ersten Stapel (20) von Kalenderwalzen ist und die untere Seite der Bahn (W) in Kontakt mit wenigstens einer Thermowalze (22B, 24B) in dem zweiten Stapel (30) von Kalenderwalzen ist, so dass durch Verwenden der ersten Laufrichtung eine zweiseitige Faserbahnsorte produziert werden kann, und durch Verwenden der zweiten Laufrichtung eine einseitige Faserbahnsorte produziert werden kann.
EP12151578.7A 2012-01-18 2012-01-18 Verfahren in einem Mehrrollenkalender Not-in-force EP2617895B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12151578.7A EP2617895B1 (de) 2012-01-18 2012-01-18 Verfahren in einem Mehrrollenkalender
CN201310018654.2A CN103215841B (zh) 2012-01-18 2013-01-18 用于多辊压光机的方法及多辊压光机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12151578.7A EP2617895B1 (de) 2012-01-18 2012-01-18 Verfahren in einem Mehrrollenkalender

Publications (2)

Publication Number Publication Date
EP2617895A1 EP2617895A1 (de) 2013-07-24
EP2617895B1 true EP2617895B1 (de) 2016-03-30

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ID=45495836

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Application Number Title Priority Date Filing Date
EP12151578.7A Not-in-force EP2617895B1 (de) 2012-01-18 2012-01-18 Verfahren in einem Mehrrollenkalender

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EP (1) EP2617895B1 (de)
CN (1) CN103215841B (de)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI96334C (fi) 1993-11-24 1996-06-10 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri
WO2004040059A1 (en) * 2002-10-30 2004-05-13 Metso Paper, Inc. Method and arrangement for calendering a web
AU2003290142A1 (en) * 2003-01-02 2004-07-29 Metso Paper, Inc. Multiroll calender
FI119068B (fi) * 2004-11-12 2008-07-15 Metso Paper Inc Menetelmä kalanterissa ja monitelakalanteri sekä menetelmä monitelakalanterin kalanteritelan laakerin kuormittamiseksi ja monitelakalanteri
FI117868B (fi) * 2006-01-02 2007-03-30 Metso Paper Inc Förfarande och flervalskalander för att kalandrerattapintaisen kuiturainan kalanteroimiseksi

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Publication number Publication date
CN103215841B (zh) 2016-01-06
CN103215841A (zh) 2013-07-24
EP2617895A1 (de) 2013-07-24

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