EP2806063A1 - Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations - Google Patents

Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations Download PDF

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Publication number
EP2806063A1
EP2806063A1 EP13168415.1A EP13168415A EP2806063A1 EP 2806063 A1 EP2806063 A1 EP 2806063A1 EP 13168415 A EP13168415 A EP 13168415A EP 2806063 A1 EP2806063 A1 EP 2806063A1
Authority
EP
European Patent Office
Prior art keywords
calender
roll
vibration
fly
nip
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Withdrawn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
EP13168415.1A
Other languages
German (de)
English (en)
Inventor
Rami Vanninen
Mika Kaisanlahti
Juha Kuismin
Pauli Lahtila
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
Valmet Technologies 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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Priority to EP13168415.1A priority Critical patent/EP2806063A1/fr
Priority to CN201420254846.3U priority patent/CN203834286U/zh
Publication of EP2806063A1 publication Critical patent/EP2806063A1/fr
Withdrawn legal-status Critical Current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
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0045—Paper-making control systems controlling the calendering or finishing
    • 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
    • D21G1/008—Vibration-preventing or -eliminating devices
    • 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

Definitions

  • the invention relates to a method for preventing vibration of a calender.
  • the invention also relates to a calender with an arrangement preventing vibration.
  • Particularly the invention relates to a method according to the preamble of claim 1 and to a calender according to the preamble of claim 7.
  • a typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and sections for finishing the fiber web, for example, a sizer, a calender, a coating section.
  • the production and treatment line also comprises at least one winder for forming customer rolls as well as a roll packaging apparatus.
  • fiber webs are meant for example a paper, board, tissue webs. In each section and device vibrations may occur in several different components.
  • vibrations may occur in a nip, which is formed in between two elements, typically between two rolls but also the nip can be formed with a roll, a belt, a shoe or corresponding element and a counter-element of corresponding or different kind, often at least one of the nip forming elements is a roll.
  • the fiber web is pressed in order to remove water from the web or to effect to the properties of the web and by the deflection compensated roll the nip pressure is controlled in cross-direction or the fiber web i.e. in the longitudinal direction of the roll.
  • Calendering is generally carried out in order to improve the properties, like smoothness and gloss, of a fiber web, such as a paper or board web.
  • a nip i.e. calendering nip
  • 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 two rolls, typically 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 relief systems are used.
  • a smooth-surfaced press roll such as metal roll
  • a roll coated with resilient material such as a polymer roll
  • Multinip or multiroll calenders are known in which the fiber 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 vertical or inclined stack of rolls.
  • a calender comprising at least three calender rolls, of which rolls at least one is displaceable such that its center line is off the line passing via the axis of the other rolls.
  • fly rolls arranged in connection with the calender, by which fly rolls the fiber web is transferred from one calendering nip to the next calendering nip.
  • the fly rolls comprise an adjustment possibility for moving their position to control the travel of the fiber web.
  • the arrangement in which the fly roll is arranged movable so, that its position in view of the calender roll stack is adjustable, to alternating distances from the calender roll stack, is an effective manner to prevent fiber web induced nip vibration i.e. barring in a multiroll calender.
  • the arrangements known from practice are manually controlled.
  • An object of the present invention is to provide a method for preventing vibration of a calender and a calender with an arrangement for preventing vibration in which the disadvantages of prior art are eliminated or at least minimized.
  • the method according to the invention is mainly characterized by the features of claim 1 and the calender with an arrangement for preventing vibration is mainly characterized by the features of claim 7.
  • position of the at least one fly roll is adjusted relative to the calender roll stack to prevent fiber web induced nip vibration, or barring.
  • the position of the at least one fly roll is calculated based on frequency of nip vibration, length of travel distance of a fiber web from one calendering nip to the next calendering nip and running speed of the calender.
  • the position of the fly roll is defined automatically on basis of vibration, noise or fiber web caliber.
  • the position of the fly roll to prevent barring is defined in 0,5 s - 5 min.
  • the calender with an arrangement for preventing vibration which calender comprises a calender roll stack with at least three calender rolls forming at least two calendering nips and at least one fly roll position-adjustable relative to the calender roll stack to prevent fiber web induced nip vibration, or barring.
  • the arrangement for preventing vibration comprises a sensor for measuring vibration in the calender and/or a sensor for measuring noise at the calender and/or a measurement device for measuring caliber of the fiber web and a control device that based on the measurement information calculates the position for the at least one fly roll to prevent the barring and that the position of the at least one fly roll is defined in 0,5 s - 5 min by the control device.
  • nip vibration in the calender or noise at the calender or caliber of the fiber web is measured continuously and based on the measurement information the position for the at least one fly roll is calculated and adjusted to prevent barring.
  • the position of the at least one fly roll in relation to the calender roll stack is adjustable in position area of 2 mm - 200 mm, advantageously 2 mm - 50 mm.
  • the fly roll position for preventing barring is defined and adjusted fast enough even in cases where the barring evolves rapidly. Furthermore usability is improved both in new installation calenders and in calenders already in used as the invention can be installed into already existing calenders, in which the position adjustment of a fly roll is used for preventing barring.
  • the invention is in particular utilizable in calenders where the operations of the calender are mainly manually controlled.
  • the invention is utilizable in connection of production of all grades of fiber webs.
  • 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. The subsequent descriptions are examples of some values presently applied for fibrous webs, and there may be considerable variations from the disclosed values.
  • 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/m3, 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 printing papers contain bleached birch wood 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 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/m2, 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 and wallpaper bases.
  • Board making makes use of chemical pulp, mechanical pulp and/or recycled pulp.
  • Boards can be divided e.g. in the following main groups cartonboards, containerboards and specialty boards.
  • Containerboards comprise f. ex. linerboard and fluting board and other corrugated boards and specialty boards comprise wallpaper base, plaster board etc.
  • Graphic boards are used for making e.g. cards, files, folders, cases, covers, etc.
  • the calender and the method according to the invention can be utilized in an online-calender or as an offline-calender.
  • figure 1 in figure 1 is schematically shown an example of a calender with a calender control arrangement according to an advantageous example of the invention.
  • Figure 1 schematically show an example of multiroll calender 10 with a stack of calender rolls 12, 13, 14, in which a fiber web W is calendered in the calendering nips N between the calender rolls 14, 13; 13,12; 12,13.
  • a calender roll that is a resilient-surfaced calender roll is indicated and by reference numeral 12 a calender roll that is a smooth-surfaced calender roll, for example a thermo roll, is indicated.
  • the upper roll 14 of the calender roll stack is a deflection compensated roll.
  • Resilient-surfaced calender rolls 13 are soft-surfaced, for example polymer-surfaced deflection, rolls and smooth-surfaced rolls 12 are metal rolls, or thermo rolls either heatable and/or coolable thermo rolls.
  • Fly rolls guiding the fiber W web in the calender 10 are indicated by reference numeral 15 and a guide roll 16 guides the fiber web W from the calender 10 to further operations.
  • position P of the at least one fly roll 15 is adjusted relative to the calender roll stack to prevent fiber web W induced nip vibration, or barring.
  • the position P of the at least one fly roll 15 is calculated based on frequency of nip vibration, length L of travel distance of a fiber web W from one calendering nip N to the next calendering nip N and running speed of the calender 10.
  • the position P of the at least one fly roll 15 is defined by a control device 20 automatically on basis of measurements of vibration and/or noise and/or fiber web caliber to prevent the nip vibration, or barring, and that the position of the at least one fly roll 15 is defined in 0,5 s - 5 min.
  • the control device 20 may also receive information and/or measurement results from other part/-s 22 of the fiber web machine.
  • the position of the at least one position adjustable fly roll 15 is defined automatically on basis of vibration and/or noise and/or fiber web caliber.
  • the position of the at least one position adjustable fly roll 15 to prevent barring is defined in 0,5 s - 5 min.
  • the position P of the at least one position adjustable fly roll 15 in relation to the calender roll stack is adjustable in position distance of 2 mm - 200 mm, advantageously 2 mm - 50 mm.

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  • Paper (AREA)
EP13168415.1A 2013-05-20 2013-05-20 Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations Withdrawn EP2806063A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13168415.1A EP2806063A1 (fr) 2013-05-20 2013-05-20 Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations
CN201420254846.3U CN203834286U (zh) 2013-05-20 2014-05-19 具有防振设备的压光机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13168415.1A EP2806063A1 (fr) 2013-05-20 2013-05-20 Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations

Publications (1)

Publication Number Publication Date
EP2806063A1 true EP2806063A1 (fr) 2014-11-26

Family

ID=48470774

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13168415.1A Withdrawn EP2806063A1 (fr) 2013-05-20 2013-05-20 Procédé pour empêcher les vibrations d'une calandre et calandre avec agencement permettant d'empêcher les vibrations

Country Status (2)

Country Link
EP (1) EP2806063A1 (fr)
CN (1) CN203834286U (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036574C1 (de) * 2000-07-27 2001-08-16 Voith Paper Patent Gmbh Verfahren zum Kalandrieren einer Materialbahn
EP1275775A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Procédé pour le fonctionnement d'une calandre
EP1275777A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Procédé pour le fonctionnement d'une calandre
EP1275776A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Calandre et procédé d'arranger les rouleaux dans un ensemble de rouleaux
DE102006030684A1 (de) 2005-07-12 2007-01-25 Metso Paper, Inc. Kalander
WO2008049973A2 (fr) * 2006-10-25 2008-05-02 Metso Paper, Inc. Calandre multi-rouleaux en ligne et méthode de calandrage d'une bande fibreuse sur une calandre multi-rouleaux en ligne.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036574C1 (de) * 2000-07-27 2001-08-16 Voith Paper Patent Gmbh Verfahren zum Kalandrieren einer Materialbahn
EP1275775A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Procédé pour le fonctionnement d'une calandre
EP1275777A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Procédé pour le fonctionnement d'une calandre
EP1275776A1 (fr) 2001-07-12 2003-01-15 Voith Paper Patent GmbH Calandre et procédé d'arranger les rouleaux dans un ensemble de rouleaux
US6851356B2 (en) 2001-07-12 2005-02-08 Voith Paper Patent Gmbh Calender and process for arranging rolls in a roll stack of a calender
US6892631B2 (en) 2001-07-12 2005-05-17 Voith Paper Patent Gmbh Process for operating a calender
US6902691B2 (en) 2001-07-12 2005-06-07 Voith Paper Patent Gmbh Process for operating a calendar
DE102006030684A1 (de) 2005-07-12 2007-01-25 Metso Paper, Inc. Kalander
WO2008049973A2 (fr) * 2006-10-25 2008-05-02 Metso Paper, Inc. Calandre multi-rouleaux en ligne et méthode de calandrage d'une bande fibreuse sur une calandre multi-rouleaux en ligne.

Also Published As

Publication number Publication date
CN203834286U (zh) 2014-09-17

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