EP2808444B1 - Arrangement de calandre - Google Patents

Arrangement de calandre Download PDF

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Publication number
EP2808444B1
EP2808444B1 EP13170039.5A EP13170039A EP2808444B1 EP 2808444 B1 EP2808444 B1 EP 2808444B1 EP 13170039 A EP13170039 A EP 13170039A EP 2808444 B1 EP2808444 B1 EP 2808444B1
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EP
European Patent Office
Prior art keywords
calender
rolls
calendering
fiber web
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.)
Active
Application number
EP13170039.5A
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German (de)
English (en)
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EP2808444A1 (fr
Inventor
Jani Hakola
Mika Viljanmaa
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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Priority to EP13170039.5A priority Critical patent/EP2808444B1/fr
Priority to CN201420264855.0U priority patent/CN204059086U/zh
Publication of EP2808444A1 publication Critical patent/EP2808444A1/fr
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Publication of EP2808444B1 publication Critical patent/EP2808444B1/fr
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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
    • 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
    • D21G1/0246—Hard rolls
    • 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
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid

Definitions

  • present invention relates to a calender of a fiber web machine. More especially the present invention relates to a calender according to preamble part of claim 1.
  • Calendering is generally carried out in order to improve the properties; surface properties, like smoothness and gloss, and caliber of a fiber web such as a paper or board web. Calendering has different functions depending on the location of the calender in the fiber web production line and on the fiber web grade to be produced. For example when producing coated fiber web grades a precalender is used before coating and after coating the fiber web is calendered in final calender.
  • Calender can be an incorporated part of the fiber web production line or the coating machine i.e. an online-calender. In case a calender forms an independent unit, it is called offline-calender. Into online-calenders the fiber web is guided from the drying section of the fiber web machine or of the coater. Into offline-calenders the fiber web is guided from a reel-up.
  • calendering 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.
  • calenders are used in calendering of fiber webs: in hard nip calenders (machine calenders) there are typically 1-2 nips and the web is calendered in a nip between two hard rolls, in soft calenders there are typically 1 - 4 nips and at least one of the nip rolls of the nip is a soft surface polymer roll. In hard nip calenders and in soft calenders on of nip rolls is a heatable thermo roll. Multiroll calenders have usually 5 - 11 nips i.e. 6 - 12 calender rolls, of which 2 - 5 are thermo rolls and 4 - 7 soft surfaced, polymer coated rolls.
  • hard nip calenders the fiber web is calendered between two or more hard rolls.
  • Two-roll hard nip calenders are primarily used for calendering webs that do not need heavy calendering: for precalendering before coating and for finishing of uncoated wood-free paper grades.
  • Other types of hard nip calenders are multiroll hard nip calenders.
  • the two-roll hard nip calender comprise a heated cast-iron roll and a deflection compensated roll supported by bearing housings of the rolls on frame, at one side on open frames and at both sides on closed frames.
  • Heated rolls are either double-walled rolls or peripherally drilled rolls, in which hot water is circulated for heating the roll surface to temperatures 80 - 120 °C.
  • Deflection compensated rolls are swimming rolls, CD-rolls, hydrostatically supported deflection rolls, hydraulically deflection compensated swimming rolls or zone controlled deflection compensated rolls.
  • Nip rolls are loaded against each other with pneumatic bellows, pneumatic or hydraulic cylinders or with hydrostatic roll itself.
  • One or two drives are used depending on the speed of the calender.
  • WO2007/077296A1 a device for manufacturing a matte-surface fibrous web, in which the matte process can be implemented with a hard nip, which is arranged in a machine calender or metal belt calender or the roll stack of a multiroll calender, for example.
  • a calender which according to one advantageous example is a machine calender comprising four hard-surfaced rolls that are in a nip contact with each other so as to form three nips and the rolls are generally thermo rolls and hard-surfaced deflection-compensated rolls.
  • An object of the present invention is to create a new type of calender.
  • a particular, conditional object of the present invention is to create a calender with simple environmentally friendlier and cheaper construction.
  • the calender according to the invention is mainly characterized by the features of the characterizing part of claim 1.
  • the hard thermo roll/-s is/are advantageously of over 350 HV 10 hardness and advantageously has/have a drying cylinder type construction, i.e. a mantle type construction not a peripherally drilled construction.
  • the diameter of the roll is 400 - 1100 mm.
  • the thermo roll/-s is/are connected directly to the steam system of the fiber web production plant for heating and pressure of the heating steam is 1 - 40 bar.
  • the rolls are not heated.
  • the calender comprises one drive that is connected to one of the two rolls and the drive is integrated to the calender and advantageously located between the frames of the calender i.e. advantageously next to the roll of the calender not extending in the longitudinal direction over the calender roll length.
  • the drive is a belt drive or a direct drive.
  • the calender comprises a driving motor that is located inside the calender i.e. advantageously next to the roll of the calender not extending in the longitudinal direction over the calender roll length, more advantageously in between the bearings of the rolls.
  • the calender according to the invention is constructed as one unit and the weight of the whole calender ready to start (including rolls) is 10 - 100 tons such that is transferrable as a single unit.
  • the calender is connected to an outside energy source.
  • the frame of the calender is constructed of solid plates and comprises no box type structures nor beam structures and thus 5 - 75 % raw material saving in construction materials of the calender is achieved.
  • the lifting brackets are integrated to the frame and thus part of the calender complex.
  • the height of the calender is 1 - 5 m.
  • a gravity-loadable doctor is used in threading the fiber web. The doctor can be only a short piece doctor and can oscillate also. Furthermore no spreading roll is used for guiding the web into or from the calender neither a web splicing unit is needed.
  • the calender comprises pneumatic loading means for loading the calendering rolls against each other and providing the nip load that is advantageously 5 - 100 kN/m and advantageously the pneumatic loading means are pneumatic bellows with gas or air loading.
  • the construction of the calender provides itself for safety and no separate safety devices are needed.
  • the calender comprises a mechanical brake that is connected to one of the rolls of the calender and in the event of possible web winding around the roll the calendering nip is forced open and the mechanical brake stops the calender.
  • the calender is operated manually and the controls of the calender are local and integrated to the calender.
  • the control console is an integrated part of the calender. This provides for easy operation and no connections to other systems in the fiber web production line are needed.
  • the need for maintenance is minimized as the calender has simple construction of all components. Furthermore the fault seeking in possible failure situation is easy, since the calender is not complicated.
  • the calender according to the invention can be utilized as an online-calender or as an offline-calender. Furthermore the calender can be a new calender to be installed or a modernization or a rebuild calender replacing an already existing calender.
  • the calender according to the invention is applicable in calendering all types of fiber web grades.
  • Paper and board are available in a wide variety of types and can be divided according to basis weight in two grades: 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 m/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.
  • DIP deinked pulp
  • TMP mechanical pulp
  • DIP based newsprint may contain up to 20 % filler.
  • the filler content of a virgin-fiber based newsprint furnish is about 8 %.
  • CSWO newsprint can be regarded as follows: basis weight 40-48.8 g/m 2 , PPS s10 roughness (SCAN-P 76-95) 4.0-4.5 ⁇ m, Bendtsen roughness (SCAN-P21:67) 150 ml/min, density 600-750 kg/m 3 , brightness (ISO 2470:1999) 58-59 %, and opacity (ISO 2470:1998) 92-95%.
  • Uncoated magazine paper (SC-supercalendered) grades usually contain 50 % - 75 % mechanical pulp, 5 % - 25 % chemical pulp, and 10 % - 35 % filler.
  • the paper may also contain DIP.
  • Typical values for calendered SC paper containing e.g.
  • SC-C, SC-B, and 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) 1.0-2.5 ⁇ m, density 700-1250 kg/m 3 , brightness (ISO 2470:1999) 62-75%, and opacity (ISO 2470:1998) 90-95%.
  • Coated mechanical papers include for example MFC (machine finished coated), LWC (light weight coated), MWC (medium weight coated), and HWC (heavy weight coated) grades.
  • Coated mechanical papers usually contain 45 % -75 % mechanical or recycled fiber and 25 % - 55 % chemical pulp.
  • Semi-chemical pulps are typical in LWC paper grades made in the Far East.
  • the filler content is about 5 % -10 %.
  • the grammage is typically in the range 40-80 g/m2.
  • LWC paper can be regarded as follows: basis weight 40-70 g/m 2 , Hunter gloss 50-65%, PPS S10 roughness 1.0-1.5 ⁇ m (offset) and 0.6-1.0 ⁇ m (roto), density 1100-1250 kg/m 3 , brightness 70-75%, and opacity 89-94%.
  • MFC paper machine finished coated
  • basis weight 48-70 g/m 2 Hunter gloss 25-40%
  • PPS S10 roughness 2.2-2.8 ⁇ m density 900-950 kg/ m 3
  • brightness 70-75% brightness 70-75%
  • opacity 91-95% 91-95%.
  • MWC paper medium weight coated
  • basis weight 70-90 g/ m 2 g/ m 2
  • Hunter gloss 65-70% PPS S10 roughness 0.6-1.0 ⁇ m
  • density 1150-1250 kg/ m 3 a measure of brightness
  • brightness 70-75% a measure of brightness
  • Woodfree paper is divided into two segments: uncoated and coated. Conventionally, the furnish of woodfree papers consists of bleached chemical pulp, with less than 10 % mechanical pulp.
  • Typical values are for uncoated WFU Copy paper: grammage 70-80 g/m 2 , Bendtsen roughness 150-250 ml/min and bulk > 1.3 cm 3 /g; for uncoated offset paper: grammage 60-240 g/m 2 , Bendtsen roughness 100-200 ml/min and bulk 1.2- 1.3 cm 3 /g; and for color copy paper: grammage 100 g/m 2 , Bendtsen roughness ⁇ 50 ml/min and bulk 1.1 cm 3 /g.
  • WFC coated pulp-based printing papers
  • the amounts of coating vary widely in accordance with requirements and intended application.
  • Containerboard includes both linerboard and corrugating medium. Liners are divided according to their furnish base into kraftliner, recycled liner and white top liner. Liners are typically 1- to 3-ply boards with grammages varying in the range 100-300 g/m 2 .
  • Linerboards are generally uncoated, but the production of coated white-top liner is increasing to meet higher demands for printability.
  • the main cartonboard grades are folding boxboard (FBB), white-lined chipboard (WLC), solid bleached board (SBS) and liquid packaging board (LPB). In general, these grades are typically used for different kinds of packaging of consumer goods.
  • Carton board grades vary from one- up to five-ply boards (150-400 g/m 2 ). The top side is usually coated with from one to three layers (20-40 g/m 2 ), the back side has less coating or no coating at all. There is a wide range of different quality data for the same board grade.
  • FBB has the highest bulk thanks to the mechanical or chemimechanical pulp used in the middle layer of the base board.
  • the middle layer of WLC consists mainly of recycled fiber, whereas SBS is made from chemical pulp, exclusively.
  • FBB's bulk typically is between 1.1-1.9 cm 3 /g whereas WLC is on range 1.1-1.6 cm 3 /g and SBS 0.95-1.3 cm 3 /g.
  • the PPS-s10-smoothess is respectively for FBB between 0.8 - 2.1 ⁇ m, for WLC 1.3- 4.5 ⁇ m and for SBS 0.7 - 2.1 ⁇ m.
  • Release paper is used in label base paper in various end-use applications, such as food packaging and office labels.
  • the most common release paper in Europe is supercalendered glassine paper coated with silicone to provide good release properties.
  • Typical values for supercalendered release papers are basis weight 60 - 95 g/m 2 , caliper 55-79 ⁇ m, IGT 12-15 cm, Cobb Unger for dense side 0.9-1.6 g/m 2 and for open side 1.2-2.5 g/m 2 .
  • Coated label paper is used as face paper for release, but also for coated backing paper and flexible packings.
  • Coated label paper has a grammage of 60-120 g/m 2 and is typically sized or precoated with a sizer and single-blade coated on one side.
  • Some typical paper properties for coated and calendered label paper are basis weight 50-100 g/m 2 , Hunter gloss 70-85%, PPS s10 roughness 0.6-1.0 ⁇ m, Bekk smoothness 1500-2000 s and caliper 45-90 ⁇ m.
  • the calender 10 comprises two hard thermo rolls 11, 12 forming the calendering nip N of the calender 10.
  • the rolls are similar and exchangeable.
  • the calender 10 comprises one hard thermo roll 12 and one deflection compensated roll 11 forming the calendering nip N of the calender.
  • the hard thermo roll 11; 12 has advantageously hardness of over 350 HV 10 and advantageously have a drying cylinder type construction, i.e. a mantle type construction.
  • the diameter of the roll is 400 - 1100 mm.
  • the thermo roll/-s 11; 12 is/are connected directly to the steam system (not shown) of the fiber web production plant for heating.
  • the calender 10 comprises one drive 13 that is connected to one of the two rolls 11; 12 and the drive 13 is integrated to the calender and advantageously located inside the frame 14 of the calender.
  • the calender also comprises a driving motor 15 that is located between the frames 14 of the calender, more advantageously in between the bearings 16 of the rolls 11, 12.
  • the calender 10 is constructed as one complex.
  • the frame 14 of the calender is constructed of solid plates and comprises no box type structures nor beam structures.
  • the lifting brackets 17 are integrated to the frame 14 and thus part of the calender unit.
  • the height H of the calender 10 is 1 - 5 m.
  • Gravity-loadable doctor 18 is used in threading the fiber web. As can been seen from the figure 1 no spreading roll is for guiding the web into or from the calender 10 and no web splicing unit exists.
  • the calender 10 comprises pneumatic loading means 19 for loading the calender rolls 11, 12 against each other and the calender nip N load is advantageously 5 - 100 kN/m and advantageously the pneumatic loading means are pneumatic bellows with gas or air loading.
  • the calender comprises a mechanical brake (not shown) that is connected to one of the rolls 11;12 of the calender 10 and in the event of possible web winding around the roll the calendering nip N is forced open and the mechanical brake stops the calender 10.
  • the control console 20 is an integrated part of the calender and fixed to the frame 14.

Claims (11)

  1. Calandre (10) destinée au calandrage de nappe fibreuse, laquelle calandre comprend deux rouleaux (11, 12) formant un interstice de calandrage (N), lesquels rouleaux (11, 12) étant des rouleaux thermiques durs permettant le calandrage des deux faces de la nappe fibreuse simultanément, la calandre comprenant un cadre (14), un moyen de chargement (19) pour charger les rouleaux (11, 12) l'un contre l'autre pour permettre chargement d'interstice dans l'interstice de calandrage (N), une commande (13) et un moteur d'entraînement (15), caractérisée en ce que la calandre est conçue sous forme d'une seule unité et que le poids de l'unité de calandre est de 10 à 100 tonnes et que la hauteur de la calandre (10) est de 1 à 5 m et que le cadre (14) de la calandre (10) est composé de plaques solides et ne comprend pas de structures de type boîtes ni de structures à poutres.
  2. Calandre selon la revendication 1, caractérisée en ce que les rouleaux (11, 12) sont similaires et échangeables.
  3. Calandre selon la revendication 2, caractérisée en ce que la calandre (10) comporte un seul rouleau de rechange.
  4. Calandre selon la revendication 1, caractérisée en ce qu'au moins un rouleau de calandre (11, 12) est réalisé par couronnement et que les rouleaux (11, 12) ont une dureté supérieure à 350 HV10 et une structure de type enveloppe et que le diamètre des rouleaux de calandres est de 400 à 1100 mm.
  5. Calandre selon la revendication 1, caractérisée en ce que la commande (13) est une commande à courroie ou une commande directe connectée à un des rouleaux (11) et que la commande est intégrée à la calandre.
  6. Calandre selon la revendication 1, caractérisée en ce que la calandre (10) comporte des consoles de levage (17) qui sont intégrées au cadre (14).
  7. Calandre selon la revendication 1, caractérisée en ce que la calandre (10) comporte une racle chargeable par gravité (18) pour enfiler la nappe fibreuse.
  8. Calandre selon la revendication 1, caractérisée en ce que le moyen de chargement est un moyen de chargement pneumatique (19), avantageusement des soufflets pneumatiques.
  9. Calandre selon la revendication 1, caractérisée en ce que la calandre (10) comporte un frein mécanique qui est connecté à un des rouleaux de calandre (11, 12).
  10. Calandre selon la revendication 1, caractérisée en ce que la calandre (10) est actionnée manuellement et comporte une console de commande (20) qui fait partie intégrante de la calandre (10).
  11. Calandre selon l'une quelconque des revendications précédentes, caractérisée en ce que la calandre (10) est une calandre en ligne ou une calandre hors ligne et que la calandre (10) est utilisable dans le calandrage de tous types de qualités de nappes fibreuses.
EP13170039.5A 2013-05-31 2013-05-31 Arrangement de calandre Active EP2808444B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13170039.5A EP2808444B1 (fr) 2013-05-31 2013-05-31 Arrangement de calandre
CN201420264855.0U CN204059086U (zh) 2013-05-31 2014-05-22 压光机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13170039.5A EP2808444B1 (fr) 2013-05-31 2013-05-31 Arrangement de calandre

Publications (2)

Publication Number Publication Date
EP2808444A1 EP2808444A1 (fr) 2014-12-03
EP2808444B1 true EP2808444B1 (fr) 2016-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP13170039.5A Active EP2808444B1 (fr) 2013-05-31 2013-05-31 Arrangement de calandre

Country Status (2)

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EP (1) EP2808444B1 (fr)
CN (1) CN204059086U (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20030377A0 (fi) * 2003-03-13 2003-03-13 Metso Paper Inc Menetelmä kalanteroinnissa ja kalanteri
FI117869B (fi) * 2006-01-02 2007-03-30 Metso Paper Inc Menetelmä ja laite mattapintaisen kuiturainan valmistamiseksi
FI8227U1 (fi) * 2008-10-28 2009-03-23 Metso Paper Inc Kuiturainakoneen tela

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Publication number Publication date
CN204059086U (zh) 2014-12-31
EP2808444A1 (fr) 2014-12-03

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