EP2628851A1 - Verfahren in einem Mehrrollenkalander und Mehrrollenkalander - Google Patents

Verfahren in einem Mehrrollenkalander und Mehrrollenkalander Download PDF

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Publication number
EP2628851A1
EP2628851A1 EP12155384.6A EP12155384A EP2628851A1 EP 2628851 A1 EP2628851 A1 EP 2628851A1 EP 12155384 A EP12155384 A EP 12155384A EP 2628851 A1 EP2628851 A1 EP 2628851A1
Authority
EP
European Patent Office
Prior art keywords
calender
rolls
multiroll
roll
fly
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.)
Withdrawn
Application number
EP12155384.6A
Other languages
English (en)
French (fr)
Inventor
Tommi Vanhala
Hannu Pullinen
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
Original Assignee
Metso Paper Oy
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.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Priority to EP12155384.6A priority Critical patent/EP2628851A1/de
Priority to CN 201320022120 priority patent/CN203113150U/zh
Publication of EP2628851A1 publication Critical patent/EP2628851A1/de
Withdrawn legal-status Critical Current

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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
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0073—Accessories for calenders
    • D21G1/0086—Web feeding or guiding devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0293—Provisions or constructions to facilitate the removal of the rolls

Definitions

  • present invention relates to calendering of fiber web in a calender of a fiber web machine. More especially the present invention relates to a method according to preamble part of claim 1 and to a multiroll calender according to preamble part of claim 7.
  • 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 disclosed 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.
  • WO publication 2006/051169 a method in a multiroll calender, a multiroll calender and a method for loading a calender roll of a multiroll calender is disclosed.
  • a fiber web is calendered in a multi roll calender comprising two stacks of rolls, both stacks comprising at least two calender rolls.
  • 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.
  • 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 in a multiroll calender and to a multiroll calender in which grade change of fiber web is easily applicable. Also an object of the invention is to create a multiroll calender of which investment cost is low and a further object of the invention is to create a multiroll calender in which the changing of calender rolls is simple and easy.
  • 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, especially during grade change.
  • Another object of the present invention is to achieve a method and a multiroll calender in which possible disadvantages and problems of known methods and calenders are eliminated or at least minimized.
  • the multiroll calender according to the invention is mainly characterized by the features of the characterizing part of claim 7.
  • At least one fly roll of the multiroll calender has at least two positions of use during calendering and the at least one of the fly rolls is movable between at least two locations.
  • the number of movable fly rolls is chosen in dependency of calender type and/or the fiber web grades to be calendered.
  • thermo rolls need to be replaced more seldom than the soft rolls, for example polymer coated calender rolls.
  • fly rolls are located next to thermo rolls.
  • the location of fly rolls is designed such that the replacement of a fly roll is easy for changing a calender roll and / or for changing grade of the web.
  • the number of fly rolls is minimized and thus down times are shorter and thus the capacity of the calender is improved.
  • a fiber web grade that has basis weight of 40 - 150 g/m 2 , more advantageously 40 - 70 g/m 2 , is calendered and advantageously in the method fiber web is calendered to surface roughness of 0,6 - 4,5 ⁇ m PPS s10, more advantageously 0,65 - 2,5 ⁇ m PPS s10.
  • the multiroll calender and the method in the multi roll calender are utilized in connection with calendering of fiber web grades: News, SC, LWC, MFC, MWC, WFU, WFC, Release, Glassine.
  • At least one of the fly rolls is movable between at least two locations one of which optimizes the replacement time of a resilient-surfaced calender roll and one of which that optimizes the running properties of the fiber web in the calender.
  • the fly rolls are located next to the smooth-surfaced calender rolls.
  • the number of fly rolls is minimized.
  • 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 according to the invention is schematically shown.
  • FIGS 1 - 6 schematically show examples of multiroll calenders with two stacks of calender rolls.
  • Multiroll calender shown in figures comprises two stacks of calender rolls 10, 20, in which a fiber web W is calendered in the calendering nips between the calender rolls of the stacks of calender rolls.
  • Reference numerals 11 - 17 refer to those parts and components of first stack 10 of calender rolls and reference numerals 21 - 29 to those of second stack 20 of calender rolls.
  • reference numerals 13, 23 a calender roll that is a resilient-surfaced calender roll is indicated and by reference numeral 12, 22 a calender roll that is a smooth-surfaced calender roll is indicated.
  • Resilient-surfaced calender rolls 13, 23 are soft-surfaced, for example polymer-surfaced deflection, rolls and smooth-surfaced rolls 12, 22 are metal rolls, or thermo rolls either heatable and/or coolable thermo rolls. Guide rolls guiding the web are indicated by reference numeral 26, fly rolls by reference numeral 25 and guide rolls not in use by reference numeral 27.
  • FIGS 1 - 3 a multiroll calender with two stacks of calender rolls 10, 20 is shown. The two stacks 10, 20 are located next to each other and a multiroll calender corresponding to the brand TwinLine is presented. The uppers rolls 11, 21 and the lower rolls 14, 24 of each stack 10, 20 are deflection compensated rolls.
  • Rolls 12, 22 are thermo rolls and rolls 13, 23 are resilient-surfaced polymer rolls.
  • a multiroll calender with two stacks of calender rolls 10, 20 is shown.
  • the two stacks 20, 30 are located on top of each other.
  • the uppers rolls 11 are deflection compensated rolls.
  • Rolls 12, 22 are thermo rolls and rolls 13, 23 are resilient-surfaced polymer rolls.
  • Lower rolls 14 are deflection compensated rolls.
  • calendering the web W is passed into a nip, i.e. calendering nip, formed between rolls 14, 12; 12, 13; 12, 11; 21, 22; 22, 23; 22, 24 that are pressed against each other, in which nip the web becomes deformed as by the action of temperature, moisture and nip pressure.
  • the calendering nips are formed between a smooth-surfaced press roll 12, 22 such as metal roll and a roll coated with resilient material such as a polymer roll 13, 23.
  • one-sided fiber web grade is calendered, for example glassine type paper grade.
  • fly rolls 15, 25 of stacks of calender rolls 10, 20 are located such that replacement of resilient-surfaced polymer rolls 13, 23 is simple and easy. By locating the fly rolls 15, 25 next to the thermo rolls 12, 22 that need to be replaced more seldom than the polymer rolls 13, 23 timesaving is achieved in maintenance work.
  • two-sided fiber web grade is calendered, for example...
  • fly rolls 15, 25 are located next to thermo rolls 15, 25.
  • the fly rolls 15, 25 can be movable to locations shown in the example of figure 3 for achieving good running properties for the fiber web.
  • two-sided fiber web grade is calendered.
  • the fly rolls 25 located next to two the upmost thermo rolls 22 in the second stack are movable between at least two locations as shown by arrows M in each figure 2 and 3 ; on location in which the replacement of resilient-surfaced polymer rolls is simple and easy ( fig. 2 ) and one location in which running properties of the fiber web in the calender are taken in account ( fig. 3 ).
  • the number of movable fly rolls is chosen in dependency of calender type and/or the fiber web grades to be calendered.
  • rollers 28, 29 are attached to a bearing housing of a nip roll and they keep the threading rope at right route in locations where the fly rolls are omitted.
  • FIG. 5 shows an example of calendering one-sided fiber web grades with the multiroll calender and figure 6 shows an example of calendering two-sided fiber web grades with the multiroll calender.
  • the grade change the locations of thermo rolls 22 and polymer rolls 23 in the lower stack has been changed.

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EP12155384.6A 2012-02-14 2012-02-14 Verfahren in einem Mehrrollenkalander und Mehrrollenkalander Withdrawn EP2628851A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12155384.6A EP2628851A1 (de) 2012-02-14 2012-02-14 Verfahren in einem Mehrrollenkalander und Mehrrollenkalander
CN 201320022120 CN203113150U (zh) 2012-02-14 2013-01-16 多辊压光机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12155384.6A EP2628851A1 (de) 2012-02-14 2012-02-14 Verfahren in einem Mehrrollenkalander und Mehrrollenkalander

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EP2628851A1 true EP2628851A1 (de) 2013-08-21

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CN (1) CN203113150U (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104947502A (zh) * 2015-06-12 2015-09-30 上海翔港印务有限公司 一种环保纸或再生纸的表面预处理方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107964823A (zh) * 2017-11-30 2018-04-27 海南金海浆纸业有限公司 一种单面高光铜版纸的压光方法
CN108004828A (zh) * 2017-11-30 2018-05-08 海南金海浆纸业有限公司 一种单面亚光铜版纸的压光方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI96334B (fi) 1993-11-24 1996-02-29 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri
DE10036574C1 (de) * 2000-07-27 2001-08-16 Voith Paper Patent Gmbh Verfahren zum Kalandrieren einer Materialbahn
WO2006051169A2 (en) 2004-11-12 2006-05-18 Metso Paper, Inc. Method in a multiroll calender, a multiroll calender and a method for loading a calender roll of a multiroll calender and a multiroll calender

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI96334B (fi) 1993-11-24 1996-02-29 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri
DE10036574C1 (de) * 2000-07-27 2001-08-16 Voith Paper Patent Gmbh Verfahren zum Kalandrieren einer Materialbahn
WO2006051169A2 (en) 2004-11-12 2006-05-18 Metso Paper, Inc. Method in a multiroll calender, a multiroll calender and a method for loading a calender roll of a multiroll calender and a multiroll calender

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104947502A (zh) * 2015-06-12 2015-09-30 上海翔港印务有限公司 一种环保纸或再生纸的表面预处理方法

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