WO2002068755A2 - Calandre - Google Patents

Calandre Download PDF

Info

Publication number
WO2002068755A2
WO2002068755A2 PCT/FI2002/000139 FI0200139W WO02068755A2 WO 2002068755 A2 WO2002068755 A2 WO 2002068755A2 FI 0200139 W FI0200139 W FI 0200139W WO 02068755 A2 WO02068755 A2 WO 02068755A2
Authority
WO
WIPO (PCT)
Prior art keywords
roll
belt
calendering
nip
calender
Prior art date
Application number
PCT/FI2002/000139
Other languages
English (en)
Other versions
WO2002068755A3 (fr
WO2002068755A8 (fr
Inventor
Timo Vuorimies
Original Assignee
Metso Paper, Inc.
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, Inc. filed Critical Metso Paper, Inc.
Priority to AU2002233396A priority Critical patent/AU2002233396A1/en
Publication of WO2002068755A2 publication Critical patent/WO2002068755A2/fr
Publication of WO2002068755A3 publication Critical patent/WO2002068755A3/fr
Publication of WO2002068755A8 publication Critical patent/WO2002068755A8/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the invention relates to a calender according to the preamble of claim 1.
  • the loading elements of the shoe roll provide the total load of the calendering zone formed between the belt of the shoe roll and the thermo roll and the pressure distribution of the calendering zone both in the running direction and in the cross direction of the web which is treated.
  • One problem with these concepts is that the lubricating film between the belt of the shoe roll and the loading shoe may disappear momentarily or permanently in the area of the calendering zone, causing a sudden local increase in the sliding friction of the belt, thus causing disturbances in calendering and quicker local wear of the belt.
  • soft calendering in which a calendering nip is formed between a hard thermo roll and a soft backing roll and in which two or more successive nips are generally used in which the rolls are so arranged that both sides or only a desired side of the web which is treated is subjected to a predetermined finishing or pre-calendering treatment.
  • One problem in connection with soft rolls used in soft calendering has been that the cover of a soft roll, when it undergoes elastic deformation in the area of the calendering zone, also tends to move in the direction of the web.
  • the above-noted behaviour characteristic of roll covers in the area of the calendering zone substantially limits how soft roll covers it is possible to use and, thus, it also substantially limits the length of the calendering zone, because higher elasticity increases the internal deformation of the cover and thus also the local stress in the region of attachment. Moreover, when the deformation of the cover material is heavy, an abundance of heat is generated because of internal deformation friction, and this heat can raise the temperature of the cover so high that it undergoes a transition from the region of elastic deformation to the region of plastic deformation and the deformation occurring in the calendering zone remains totally or partly permanent.
  • the temperature of the belt is prevented from increasing excessively at least partly because the belt is thin in relation to the roll cover and in it the heat produced by deformation friction is able to be conducted substantially more quickly to the surface of the belt, from which its removal can be further enhanced, when needed, for example, by cooling the belt by known means, for example, by water or air jets.
  • a technical problem with belt calendering is in keeping the belt in place in the cross direction of the web and in preventing contaminants found in the mill environment and paper or board pieces produced during web breaks from being carried inside the belt loo .
  • the calender according to the invention is mainly characterized by the disclosure in the characterizing part of claim 1.
  • a deflection- compensated roll placed inside an endless belt loop is used as the backing roll of a thermo roll in a calender, which deflection-compensated roll replaces the loading element used in shoe rolls.
  • the arrangement in accordance with the invention eliminates the variation of sliding friction, which is a drawback of the shoe roll technology, when the belt runs over the loading element and, at the same time, prevents foreign particles characteristic of the mill environment from entering the interior of the belt loop, thereby solving problems characteristic of both the shoe press technology and the belt calendering technology.
  • the belt forming the belt loop is placed between flanges placed on the shaft of the deflection-compensated roll, in which connection the inside of the belt is substantially isolated from the external environment. When, in accordance with the invention, the space inside the belt is substantially isolated from the external environment, the interior hardly gets soiled at all, and thus there are no problems with keeping it clean.
  • the flanges are mounted by means of bearings on the shaft of the deflection-compensated roll either eccentrically or concentrically but fixedly and the tension of the belt in the cross-direction of the web is maintained by the flanges.
  • the belt is meant a nip member of calendering whose structural rigidity is not alone sufficient to maintain its shape in the calendering device without members which maintain the shape of the belt.
  • a deflection-compensated, zone-controlled roll is used as the roll inside the belt, a nip pressure distribution of the desired type is provided and, when needed, it is possible to profile the calendering nip by zone control, thereby affecting the properties of the web in a direction transverse to its running direction.
  • the belt nip provided in accordance with the invention allows a good, uniform calendering load.
  • the calendering nip is longer than the soft nip used in prior art applications but shorter than the extended nip of shoe calendering applications.
  • the calendering properties of the nip can also be affected by selecting the belt material so that it meets the special needs of calendering.
  • the belt can be manufactured directly to be of the type needed in the calendering application concerned, and the hardness/softness of the belt can be selected according to the application, for example, such that possible sliding of the surface does not cause deformations in the calendering nip.
  • the number of nip cycles i.e. how often each point of the belt runs through the calendering zone, is adjusted by the length of the belt loop. By this means, the service life of the belt can also be lengthened.
  • a metal belt is used as the belt, thereby enabling the web to be hot calendered on both sides in one nip.
  • the calender in accordance with the invention replaces a soft calender with two or more nips with one or more belt calendering nips.
  • Heating of the belt can take place by means of heating devices fitted either inside or outside the belt loop.
  • the heating method it is possible to use, for example, steam heating, induction heating, or heating carried out by hot gas.
  • the length of the calendering zone can be determined by means of roll diameters and/or by means of a soft cover of the roll inside the belt loop or by means of another flexible belt loop.
  • the calender in accordance with the invention uses a metal belt, in which connection it can be used instead of conventional machine calendering.
  • machine calendering as known, the length of the nip has been extremely short and the nip pressure used has been considerable, which may have destroyed some of the structure of the web because the profile has been corrected by flattening.
  • the advantageous metal belt application of the invention is used, the above-noted drawback does not arise because an extended nip is provided in accordance with the invention and the load can be adjusted by means of the deflection-compensated roll.
  • the metal belt application of the calender in accordance with the invention also allows a two-sided metal nip in which, by means of the metal belt, a paper web is produced whose quality corresponds to that of a paper web calendered in a soft calender, using one nip instead of two, which provides a saving of space and thus cost savings.
  • One advantage of the invention is that the pressure inside the belt can be regulated as desired. For example, calendering can be started such that the pressure inside the belt loop is kept low, in which connection the belt is soft, and, at a later stage, the shape of the belt is adjusted by the pressure inside the belt loop to conform to the calendering need.
  • the vibration tendencies of the belt can be prevented, and in accordance with an advantageous arrangement of the invention in which the structure is sealed by a mechanical seal construction, for example, a labyrinth seal, oil is prevented from coming out of the inside of the belt loop.
  • a mechanical seal construction for example, a labyrinth seal
  • Figure 1 is a schematic illustration of one embodiment of the calender in accordance with the invention, showing one nip.
  • FIG. 2 is a schematic sectional view of Fig. 1.
  • a deflection-compensated roll 10 comprises a stationary roll shaft 11 on which a roll shell 12 is arranged to rotate.
  • a thermo roll 20 is arranged against the deflection-compensated roll 10 such that a belt 30 running on the outer surface of the roll shell 12 of the deflection- compensated roll 10 and the outer surface of the thermo roll 20 form a calendering nip N with each other, through which nip a paper web W is caused to run.
  • Hydraulic loading elements 17 acting on the inner surface of the roll shell 12 are disposed between the shaft 11 of the deflection-compensated roll 10 and the roll shell 12, which loading elements are arranged to act in the plane of the nip N.
  • a plurality of hydraulic loading elements 17 spaced from one another are arranged to act on the inner surface of the roll shell 12, the compression of which loading elements against the inner surface of the roll shell can be adjusted individually or in groups such that the axial profile of the roll shell 12 can be controlled in a desired manner.
  • the shaft 11 of the roll 10 is provided with cylinder bores 18 for the hydraulic loading elements 17, into which bores loading pistons 19 of the hydraulic loading elements 17 are arranged to be movable in the nip plane and to which radial cylinder bores 18 the loading pistons 19 are sealed by means of seals 18 A.
  • a pressure medium for example, hydraulic oil, is passed into the cylinder bores 18 along pressure ducts 18B.
  • the calendering nip N is formed, in accordance with the invention, by the belt construction 30 arranged around the deflection- compensated roll 10 and by the thermo roll 20 acting as the other roll of the calendering nip N.
  • the belt 30 is supported on flanges 31 arranged in connection with the shaft 11 of the deflection-compensated roll 10 such that the flanges 31 keep the belt 30 in a desired shape.
  • the deflection-compensated roll 10 is located inside the loop formed by the belt 30. As shown in Figs.
  • the deflection- compensated roll 10 comprises a stationary roll shaft 11, on which the roll shell 12 is arranged to rotate, the roll shell being supported on the roll shaft 11 by means of the hydraulic loading elements 17.
  • the hydraulic loading elements 17 act in the direction of the nip plane and they make it possible to adjust the shape of the roll shell 12 and, thereby, the shape of the belt 30 and to control the axial nip profile of the roll 10.
  • the bearing arrangements of the flange constructions 31 are denoted with the reference numeral 32.
  • the flange constructions 31 are provided with sealing arrangements (not shown), preferably with mechanical sealing arrangements, which prevent oil from flowing out and also seal the constructions against contaminants from the external environment.
  • the interior of the belt construction 30 can be pressurized, in which connection the shape of the nip and the calendering properties in the calendering nip can be adjusted by means of pressure.
  • a composite or metal, which can be coated or uncoated, is used as the material of the shell 12 of the deflection-compensated roll 10.
  • the cover can be hard, wear- resistant and/or resilient.
  • the relationship between the belt and the roll 30, 10 is determined such that the roll 10 can be a driven speed or power controlled roll or a non-driven roll and the contact between the belt and the roll is based on friction, in which case no lubrication is used or, when desired, lubrication is used.
  • the belt 30 can also be cooled by means of a lubricant, water or oil, or it can be non- cooled.
  • the belt 30 it is possible to use fabric- or fibre-reinforced polymer, which may be hard or resilient or the belt material can be of metal, in which case a resilient cover is preferably used in the shell 12 of the deflection-compensated roll 10.
  • the material of the belt 30 may also be metal.

Landscapes

  • Paper (AREA)

Abstract

Cette invention se rapporte à une calandre comprenant au moins une pince de calandrage (N) formée entre un rouleau chauffant (20) et son contre-rouleau (10). La bande (W) à calandrer, notamment une bande de papier ou de carton, est amenée à passer à travers cette pince. Une boucle de courroie sans fin (30) associée au contre-rouleau (10), est amenée à défiler à travers la pince de calandrage (N). Des brides (31) ou des éléments équivalents sont associés à un arbre fixe (11) du contre-rouleau (10) pour servir de support à la boucle de courroie (30) et pour lui conserver sa forme.
PCT/FI2002/000139 2001-02-27 2002-02-21 Calandre WO2002068755A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002233396A AU2002233396A1 (en) 2001-02-27 2002-02-21 Belt calender

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20010391A FI20010391A (fi) 2001-02-27 2001-02-27 Kalanteri
FI20010391 2001-02-27

Publications (3)

Publication Number Publication Date
WO2002068755A2 true WO2002068755A2 (fr) 2002-09-06
WO2002068755A3 WO2002068755A3 (fr) 2003-06-12
WO2002068755A8 WO2002068755A8 (fr) 2003-12-04

Family

ID=8560548

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2002/000139 WO2002068755A2 (fr) 2001-02-27 2002-02-21 Calandre

Country Status (3)

Country Link
AU (1) AU2002233396A1 (fr)
FI (1) FI20010391A (fr)
WO (1) WO2002068755A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314819A2 (fr) * 2001-11-24 2003-05-28 Voith Paper Patent GmbH Calandre et procédé pour le lissage de bandes de papier ou carton
CN115012156A (zh) * 2021-03-04 2022-09-06 昆山中天纺织有限公司 一种可调节压力的面料压光机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622508A1 (de) * 1975-06-13 1976-12-23 Itog Ltd Walze zur gleichmaessigen druckbehandlung flaechiger materialien
DE3239954A1 (de) * 1982-10-28 1984-05-03 J.M. Voith Gmbh, 7920 Heidenheim Walzenpresse, insbesondere fuer papierbahnen
EP0373942A2 (fr) * 1988-12-15 1990-06-20 Valmet Paper Machinery Inc. Dispositif de support pour un rouleau cylindrique variable
US6164198A (en) * 1998-12-16 2000-12-26 Valmet Corporation Apparatus for calendering paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2622508A1 (de) * 1975-06-13 1976-12-23 Itog Ltd Walze zur gleichmaessigen druckbehandlung flaechiger materialien
DE3239954A1 (de) * 1982-10-28 1984-05-03 J.M. Voith Gmbh, 7920 Heidenheim Walzenpresse, insbesondere fuer papierbahnen
EP0373942A2 (fr) * 1988-12-15 1990-06-20 Valmet Paper Machinery Inc. Dispositif de support pour un rouleau cylindrique variable
US6164198A (en) * 1998-12-16 2000-12-26 Valmet Corporation Apparatus for calendering paper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314819A2 (fr) * 2001-11-24 2003-05-28 Voith Paper Patent GmbH Calandre et procédé pour le lissage de bandes de papier ou carton
EP1314819A3 (fr) * 2001-11-24 2004-01-02 Voith Paper Patent GmbH Calandre et procédé pour le lissage de bandes de papier ou carton
CN115012156A (zh) * 2021-03-04 2022-09-06 昆山中天纺织有限公司 一种可调节压力的面料压光机

Also Published As

Publication number Publication date
WO2002068755A3 (fr) 2003-06-12
WO2002068755A8 (fr) 2003-12-04
FI20010391A0 (fi) 2001-02-27
AU2002233396A1 (en) 2002-09-12
FI20010391A (fi) 2002-08-28

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