EP1330573B1 - Method and arrangement for calendering a web comprising a long-nip calender - Google Patents

Method and arrangement for calendering a web comprising a long-nip calender Download PDF

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Publication number
EP1330573B1
EP1330573B1 EP01969838A EP01969838A EP1330573B1 EP 1330573 B1 EP1330573 B1 EP 1330573B1 EP 01969838 A EP01969838 A EP 01969838A EP 01969838 A EP01969838 A EP 01969838A EP 1330573 B1 EP1330573 B1 EP 1330573B1
Authority
EP
European Patent Office
Prior art keywords
nip
roll
long
calendering
calender
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.)
Expired - Lifetime
Application number
EP01969838A
Other languages
German (de)
French (fr)
Other versions
EP1330573A1 (en
Inventor
Matti Lares
Mikko Tani
Kimmo Saharinen
Henri Vaittinen
Pekka Koivukunnas
Reijo PIETIKÄINEN
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
Priority claimed from FI20002170A external-priority patent/FI108556B/en
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1330573A1 publication Critical patent/EP1330573A1/en
Application granted granted Critical
Publication of EP1330573B1 publication Critical patent/EP1330573B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21G1/006—Calenders; Smoothing apparatus with extended nips

Definitions

  • the present invention relates to a method for calendering a material web and a calender arrangement for implementing the method.
  • the object of the invention is a method for calendering a material web, especially a paper or board web, in a long-nip calender, in which the backing roll of the long-nip roll is a heated, metal-surfaced roll, in which case the length of the nip in the direction of travel of the material web is within the range from approximately 10 mm to 500 mm.
  • the invention also relates to a calender arrangement for calendering a material web, especially a paper or board web, the said arrangement comprising a long-nip calender, in which the backing roll of the long-nip roll is a heated, metal-surfaced roll, the rolls of which form a long nip between them, the length of which in the direction of travel of the web is within the range from approximately 10 mm to 500 mm.
  • the effective length of the nip increases due to the initial contact and because it is possible to use much softer polymers as belt material than in roll coatings without problems arising from deformation due to heat.
  • the pressure impulse directed at the paper can be increased without the pressure peak becoming too great and the bulkiness beginning to diminish.
  • a belt calendering solution has been previously described, for example, in Finnish patent publication no. 95061 and in WO- 98 00270, in which the calendering nip is formed between a heated, hard-surfaced roll and a metal belt supported by means of a calender roll having a resilient coating.
  • One disadvantage of this solution is that the maximum nip pressure is insufficient for several paper grades requiring a high degree of calendering.
  • One aim of the present invention is to achieve a solution by means of which calendering can be carried out between two hard surfaces without the disadvantages relating to conventional machine calendering, such as relatively great variations in gloss and a decrease in bulk. These disadvantages are caused by the relatively high nip pressure used in machine calendering, which is typically of the order of approximately 100 MPa.
  • the method relating to the invention is characterised in that as a long-nip roll is used a roll, the mantle of which is made of metal, at least as concerns its calendering, longitudinal, central area; that in the method, a nip pressure within the range from about 0.1 MPa to about 50 MPa is directed at the material web W, and that the surface temperature of the rolls before the nip N is adjusted to a value from about 60°C to about 350°C.
  • the nip pressure is preferably within the range from about 0.2 MPa to about 15 MPa, and the surface temperature is preferably within the range from about 120°C to about 300°C.
  • the calender arrangement relating to the invention is in turn characterised in that the mantle of the long-nip roll is made of metal, at least as concerns its calendering, longitudinal, central area.
  • the calender arrangement relating to the invention comprises a shoe roll 15, in which on a stationary axle 16, at the nip N, is arranged a loading member 17, which comprises a shoe part 19 extending over the width of the nip (in the longitudinal direction of the roll), and the pistons 20 loading it.
  • a belt mantle 30 which is made of metal, at least in its calendering central area, as shown in Figure 2.
  • the central area of the belt mantle 30 is comprised of a steel belt 31, which extends over the length of the shoe 19, and to it are connected end sections 32 made of resilient material, which may be, for example, polymer, rubber, silicone, etc.
  • the end sections 32 are connected to the steel belt 31 in a flexible manner, for example, by glueing or curing. The connection is made at a point outside the shoe part 19 to avoid directing a fatiguing load on the steel belt.
  • the steel belt 30 can also be made completely of metal, for example, by providing the end sections of the belt mantle with elastic sealing rings, which are fitted to rotate with the said mantle, as described in Finnish patent no. 66932.
  • Figure 3 shows a solution in which a thin-walled metal cylinder 41 is fitted over the polymer belt 40 of a shoe roll 15, the cylinder being tightened in place by means of the internal air pressure of the roll.
  • the length of the cylinder 41 is the same as the width of the material web and it is not fixed to the end structures of the shoe roll, whereby loading causing fatigue in metal materials is avoided in the edge area of the shoe.
  • a long nip N Between the long-nip roll 15 and its heated, metal-surfaced backing roll 11 is formed a long nip N, through which the material web W is guided, in order to calender it.
  • a nip pressure which is within the range from about 0.1 to about 50 MPa, preferably within the range from about 0.2 to about 15 MPa, which is considerably less than the pressure used in normal machine calendering, which is of the order of 100 MPa.
  • the surface temperature of the rolls before the nip N is adjusted to a value from about 60°C to about 350°C, and preferably to a value from about 120°C to about 300°C, when the surface temperature used in conventional machine calendering is typically within the range from about 60°C to about 120°C.
  • the length of the nip N in the direction of travel of the material web is preferably within the range from about 10 mm to about 500 mm.
  • the surface roughness R a of both the steel belt 30 of the long-nip roll 15 and of the outer surface of the backing roll 11 is preferably less than 0.3 ⁇ m, whereby the material web W can be subjected to gloss treatment.
  • the solution relating to the invention is applicable to both on-line use and off-line use. It is conceivable to use the calender arrangement relating to the invention, for example, on the press section for drying the material web, for pre-calendering before the coating machine and for final calendering after the coating machine.
  • the paper machine When using the apparatus relating to the invention in the dryer section of a paper machine, the paper machine can be shortened by leaving a part of the drying cylinder out.

Landscapes

  • Paper (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Golf Clubs (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention relates to a method and calender arrangement for calendering a material web (W), especially a paper or board web, in a long-nip calender, in which the backing roll (11) of the long-nip roll (15) is a heated, chilled-surface roll. The length of the long nip (N) in the direction of travel of the material web (W) is within the range from approximately 10 mm to 500 mm. In the invention, as a long-nip roll (15) is used a roll, the belt mantle (30) of which is made of metal at least as concerns its calendering, longitudinal, central area (31). In the method, a nip pressure within the range from 0.1 MPa to about 50 MPa is directed at the material web (W), and the surface temperature of the rolls (11, 15) before the nip (N) is adjusted to a value from about 60 DEG C to about 350 DEG C.

Description

  • The present invention relates to a method for calendering a material web and a calender arrangement for implementing the method.
  • The object of the invention is a method for calendering a material web, especially a paper or board web, in a long-nip calender, in which the backing roll of the long-nip roll is a heated, metal-surfaced roll, in which case the length of the nip in the direction of travel of the material web is within the range from approximately 10 mm to 500 mm. The invention also relates to a calender arrangement for calendering a material web, especially a paper or board web, the said arrangement comprising a long-nip calender, in which the backing roll of the long-nip roll is a heated, metal-surfaced roll, the rolls of which form a long nip between them, the length of which in the direction of travel of the web is within the range from approximately 10 mm to 500 mm.
  • In improving the quality of calendering, in practice the only possibility has previously been to increase the number of calendering nips, which has resulted in a more complex calender structure and more difficult paper web control and threading. Attempts have been made to solve these problems by using various belt and shoe calenders, by means of which the calendering nip is lengthened, and thus the operation of the nip is enhanced. For example, paper calendered with belt calenders is brought by means of an endless belt into initial contact with a hot calender roll, whereby a steep temperature gradient advantageous to calendering can be achieved. By means of the belt, the effective length of the nip increases due to the initial contact and because it is possible to use much softer polymers as belt material than in roll coatings without problems arising from deformation due to heat. By means of a nip longer than that in a super- or softcalender, the pressure impulse directed at the paper can be increased without the pressure peak becoming too great and the bulkiness beginning to diminish.
  • A belt calendering solution has been previously described, for example, in Finnish patent publication no. 95061 and in WO- 98 00270, in which the calendering nip is formed between a heated, hard-surfaced roll and a metal belt supported by means of a calender roll having a resilient coating. One disadvantage of this solution is that the maximum nip pressure is insufficient for several paper grades requiring a high degree of calendering.
  • One aim of the present invention is to achieve a solution by means of which calendering can be carried out between two hard surfaces without the disadvantages relating to conventional machine calendering, such as relatively great variations in gloss and a decrease in bulk. These disadvantages are caused by the relatively high nip pressure used in machine calendering, which is typically of the order of approximately 100 MPa.
  • To achieve the aims of the present invention, the method relating to the invention is characterised in that as a long-nip roll is used a roll, the mantle of which is made of metal, at least as concerns its calendering, longitudinal, central area; that in the method, a nip pressure within the range from about 0.1 MPa to about 50 MPa is directed at the material web W, and that the surface temperature of the rolls before the nip N is adjusted to a value from about 60°C to about 350°C. The nip pressure is preferably within the range from about 0.2 MPa to about 15 MPa, and the surface temperature is preferably within the range from about 120°C to about 300°C. Compared with machine calendering, by means of the solution relating to the invention is achieved, among other things, more uniform gloss, preservation of bulk and good smoothness.
  • The calender arrangement relating to the invention is in turn characterised in that the mantle of the long-nip roll is made of metal, at least as concerns its calendering, longitudinal, central area.
  • The invention is described in greater detail in the following, with reference to the accompanying drawings, in which
    • Figure 1
    shows a diagrammatic view of the long-nip calender arrangement relating to the invention, as seen from the end, and
    Figure 2
    shows a diagrammatic perspective view of an embodiment of a belt mantle of a long-nip roll applicable to the calender arrangement relating to the invention.
    Figure 3
    shows a diagrammatic view of another embodiment of a belt mantle of a long-nip roll applicable to the calender arrangement relating to the invention, as seen from the end.
  • According to Figure1, the calender arrangement relating to the invention comprises a shoe roll 15, in which on a stationary axle 16, at the nip N, is arranged a loading member 17, which comprises a shoe part 19 extending over the width of the nip (in the longitudinal direction of the roll), and the pistons 20 loading it. Around the shoe 19 runs a belt mantle 30, which is made of metal, at least in its calendering central area, as shown in Figure 2.
  • In the embodiment shown in Figure 2, the central area of the belt mantle 30 is comprised of a steel belt 31, which extends over the length of the shoe 19, and to it are connected end sections 32 made of resilient material, which may be, for example, polymer, rubber, silicone, etc. The end sections 32 are connected to the steel belt 31 in a flexible manner, for example, by glueing or curing. The connection is made at a point outside the shoe part 19 to avoid directing a fatiguing load on the steel belt.
  • The steel belt 30 can also be made completely of metal, for example, by providing the end sections of the belt mantle with elastic sealing rings, which are fitted to rotate with the said mantle, as described in Finnish patent no. 66932.
  • Figure 3 shows a solution in which a thin-walled metal cylinder 41 is fitted over the polymer belt 40 of a shoe roll 15, the cylinder being tightened in place by means of the internal air pressure of the roll. The length of the cylinder 41 is the same as the width of the material web and it is not fixed to the end structures of the shoe roll, whereby loading causing fatigue in metal materials is avoided in the edge area of the shoe.
  • Between the long-nip roll 15 and its heated, metal-surfaced backing roll 11 is formed a long nip N, through which the material web W is guided, in order to calender it. At the web is directed a nip pressure which is within the range from about 0.1 to about 50 MPa, preferably within the range from about 0.2 to about 15 MPa, which is considerably less than the pressure used in normal machine calendering, which is of the order of 100 MPa. The surface temperature of the rolls before the nip N is adjusted to a value from about 60°C to about 350°C, and preferably to a value from about 120°C to about 300°C, when the surface temperature used in conventional machine calendering is typically within the range from about 60°C to about 120°C.
  • The length of the nip N in the direction of travel of the material web is preferably within the range from about 10 mm to about 500 mm. The surface roughness Ra of both the steel belt 30 of the long-nip roll 15 and of the outer surface of the backing roll 11 is preferably less than 0.3 µm, whereby the material web W can be subjected to gloss treatment. The calender arrangement relating to the invention can also be used for one-sided or both-sided mat drive by using a sufficiently high Ra value for the steel belt and/or the surface of the backing roll, for example, within the range Ra = about 0.4 to about 2.0 µm.
  • The solution relating to the invention is applicable to both on-line use and off-line use. It is conceivable to use the calender arrangement relating to the invention, for example, on the press section for drying the material web, for pre-calendering before the coating machine and for final calendering after the coating machine.
  • When using the apparatus relating to the invention in the dryer section of a paper machine, the paper machine can be shortened by leaving a part of the drying cylinder out.

Claims (10)

  1. A method for calendering a material web (W), especially a paper or board web, in a long-nip calender, in which the backing roll (11) of the long-nip roll (15) is a heated roll, in which case the length of the nip (N) in the direction of travel of the material web (W) is within the range from approximately 70 mm to 270 mm, characterised in that as a long-nip roll (15) is used a roll, the mantle (30) of which is made of metal at least as concerns its calendering, longitudinal, central area (31); that in the method, a nip pressure within the range from about 0.1 MPa to about 50 MPa is directed at the material web (W), and that the temperature of the rolls (11, 15) before the nip (N) is adjusted to a value from about 60°C to about 350°C.
  2. A method as claimed in claim 1, characterised in that the nip pressure is within the range from about 0.2 MPa to about 15 MPa, and that the surface temperature of the rolls before the nip (N) is within the range from about 120°C to about 300°C.
  3. A method as claimed in claim 1 or 2, characterised in that in the method are used rolls (11, 15), the surface roughness Ra of the outer surface of the mantle of which is less than 0.3 µm.
  4. A method as claimed in any of the above claims, characterised in that in the method is used a long-nip roll (15), the belt mantle (30) of which is made completely of metal.
  5. A calender arrangement for calendering a material web (W), preferably a paper or board web, the arrangement comprising a long-nip calender, in which the backing roll of the long-nip roll (15) is a heated, metal-surfaced roll (11), the rolls (11, 15) of which form a long nip (N) between them, the length of the nip in the direction of travel of the material web (W) being within the range from approximately 70 mm to 270 mm, characterised in that the mantle (30) of the long-nip roll (15) is made of metal at least as concerns its calendering, longitudinal, central area (31).
  6. A calender arrangement as claimed in claim 5, characterised in that the central area of the belt mantle (30) is comprised of a steel belt (31), on the edges of which are flexibly connected end sections (32) made of a resilient non-metallic material.
  7. A calender arrangement as claimed in claim 6, characterised in that the end sections (32) are connected to the steel belt (31) by glueing or curing.
  8. A calender arrangement as claimed in claim 5, characterised in that the belt mantle (30) is made completely of metal.
  9. A calender arrangement for calendering a material web (W), preferably a paper or board web, the said arrangement comprising a long-nip calender, in which the backing roll of the long-nip roll (15) is a heated, metal-surfaced roll (11), the rolls (11, 15) of which form a long nip (N) between them, the length of which in the direction of travel of the web (W) is within the range from approximately 10 mm to 500 mm, characterised in that the mantle of the long-nip roll (15) is comprised of a belt (40) made of a polymer, over which is fitted a thin-walled metal cylinder (41).
  10. A calender arrangement as claimed in claim 9, characterised in that the metal cylinder (41) is tightened in place by means of the internal air pressure of the roll or connected by glueing or curing to the polymer belt (40) so as to rotate with it.
EP01969838A 2000-10-02 2001-09-21 Method and arrangement for calendering a web comprising a long-nip calender Expired - Lifetime EP1330573B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20002170 2000-10-02
FI20002170A FI108556B (en) 2000-05-03 2000-10-02 Process for calendering a material web and a calendering system which implements the process
PCT/FI2001/000827 WO2002029159A1 (en) 2000-10-02 2001-09-21 Method and arrangement for calendering a web comprising a long-nip calender

Publications (2)

Publication Number Publication Date
EP1330573A1 EP1330573A1 (en) 2003-07-30
EP1330573B1 true EP1330573B1 (en) 2006-05-24

Family

ID=8559211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01969838A Expired - Lifetime EP1330573B1 (en) 2000-10-02 2001-09-21 Method and arrangement for calendering a web comprising a long-nip calender

Country Status (6)

Country Link
EP (1) EP1330573B1 (en)
JP (1) JP2004510897A (en)
AT (1) ATE327376T1 (en)
AU (1) AU2001289975A1 (en)
DE (1) DE60119956T2 (en)
WO (1) WO2002029159A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI115731B (en) * 2001-09-12 2005-06-30 Metso Paper Inc Method of producing a fibrous web, especially a cardboard web, and a concept of producing a fibrous web, especially a cardboard web
DE10232550C5 (en) * 2002-07-18 2013-02-07 Voith Patent Gmbh Apparatus and method for impregnating a paper or board web
DE10239907A1 (en) * 2002-08-30 2004-03-18 Voith Paper Patent Gmbh Wide nip calender arrangement and method for satinizing a paper or cardboard web
FI120596B (en) * 2003-03-07 2009-12-15 Metso Paper Inc Method for editing paper or board
FI113881B (en) * 2003-05-30 2004-06-30 Metso Paper Inc Processing apparatus for treating fiber web, comprises belt comprising layered structure including metallic outer layer for contact with fiber web to be treated, and backing layer(s) made of flexible and/or compressible material
DE10327673B4 (en) * 2003-06-20 2005-04-14 Voith Paper Patent Gmbh Method of smoothing a paper or board web and wide-nip calender
DE102004010894A1 (en) 2004-03-06 2005-09-22 Voith Paper Patent Gmbh Method and device for treating a web of paper or cardboard
DE102004062618A1 (en) 2004-12-24 2006-07-06 Voith Paper Patent Gmbh screed assembly
DE102006001021A1 (en) * 2006-01-07 2007-07-12 Voith Patent Gmbh Paper mill matt-satin finisher for paper or cardboard has extended heating smoothing gap
DE102011007752A1 (en) * 2011-04-20 2012-10-25 Voith Patent Gmbh Roller and calender with this roller

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4204177C2 (en) * 1992-02-13 1995-07-06 Voith Gmbh J M Press roll
FI102305B (en) * 1997-04-02 1998-11-13 Valmet Corp Calendaring process and calendar for application of the process

Also Published As

Publication number Publication date
JP2004510897A (en) 2004-04-08
EP1330573A1 (en) 2003-07-30
ATE327376T1 (en) 2006-06-15
WO2002029159A1 (en) 2002-04-11
DE60119956D1 (en) 2006-06-29
AU2001289975A1 (en) 2002-04-15
DE60119956T2 (en) 2007-05-24

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