EP2119825A1 - Calendre - Google Patents

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Publication number
EP2119825A1
EP2119825A1 EP09004427A EP09004427A EP2119825A1 EP 2119825 A1 EP2119825 A1 EP 2119825A1 EP 09004427 A EP09004427 A EP 09004427A EP 09004427 A EP09004427 A EP 09004427A EP 2119825 A1 EP2119825 A1 EP 2119825A1
Authority
EP
European Patent Office
Prior art keywords
calender according
endless belt
belt
outer coating
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.)
Granted
Application number
EP09004427A
Other languages
German (de)
English (en)
Other versions
EP2119825B1 (fr
Inventor
Bernd Diepers
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40912115&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2119825(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2119825A1 publication Critical patent/EP2119825A1/fr
Application granted granted Critical
Publication of EP2119825B1 publication Critical patent/EP2119825B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D21F3/0227—Belts or sleeves therefor
    • 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 invention relates to a calender according to the preamble of claim 1.
  • a device for smoothing a material web, in particular a paper or board web which has at least one smoothing zone through which the material web is passed. At least one smoothing zone is formed between a deflection roll having a soft or elastic surface and a high-thermal conductivity endless belt having a hard and smooth surface, which is guided in the region of the smoothing zone over a support surface located inside the belt loop. On the inside, the belt loop can be acted upon by a heating medium, so that this endless belt is heated.
  • the disadvantage is the high energy consumption for heating the belt loop.
  • the soft counter roll also requires repeated maintenance by grinding the soft cover to remove markings imprinted during operation.
  • a calender for smoothing a paper or board web which has a nip formed between a heatable roll and a circumferential jacket.
  • the jacket is pressed against the roller over a predetermined circumferential area under the action of a support element.
  • an additional heated band is passed through the nip.
  • a heated strip is passed between the web and the jacket through the nip.
  • the energy consumption is high here too.
  • a device for smoothing a paper or board web which forms a smoothing zone between two mutually facing surfaces.
  • the surfaces are parallel to each other, are heated and adjustable to each other, so that the web can be exposed to a defined pressing pressure.
  • a surface is preferably a jacket of a roller.
  • the other surface is formed by means of an endless, flexible band.
  • the belt is supported towards the roll shell by means of a press-on support element.
  • This has a concave support surface to the band, which is formed to be complementary to the radius of the roll shell.
  • it is also possible to use a flexible strip which is guided in a known manner over rolling rolls and shaped in the smoothing zone into a convex shape by means of a supporting element.
  • a tape for a processing apparatus intended for the treatment of a fibrous web.
  • the processing device has a band which is configured to run around at least one guide element, and outside which at least one counter element is provided outside this band, which provides a contact surface with the band, so that there is a web processing zone between the belt and the counter element through which the web to be treated passes.
  • the tape has a layer construction with an outer metal layer intended for contact with a fiber web to be treated and at least one backing layer connected to the inner surface of the metal layer.
  • the outer metal layer has a thickness within a range of about 0.1 to about 0.3 mm. The thin metal layer allows the heat to be transferred quickly from the belt to the web.
  • the heating of the metal layer of the tape and rapid transfer therefrom to the web can be promoted by making the backing layer of a heat insulating or poorly conductive material.
  • the heat from the metal layer is transferred only toward the web and at the same time the metal layer cools down rapidly.
  • the disadvantage is that the heat storage capacity of such a thin metal strip is low. There is therefore a risk that the amount of heat transferred varies in Langnip and thus the web is smoothed unevenly.
  • the object of the invention is therefore to provide a calender for smoothing a paper or board web with at least one Langnip of the type mentioned, which better smoothes the web.
  • a calender for smoothing a paper or board web is created with at least one Langnip that realizes a soft-smoothing in a Langnip and requires little energy, because only the outer skin of the endless belt needs to be heated.
  • the heat storage capacity of the soft outer skin is good even with a thin layer.
  • a heat transfer from the warm outer skin to the paper or board web can be done by conduction on a dwell before the Langnip.
  • the outer coating has a surface quality which is advantageous for smoothing. It is further preferred that the modulus of elasticity of the outer coating is less than that of the baseband, so that pressure and temperature are transmitted evenly in Langnip.
  • the outer coating can be heated without contact. Particularly preferred is the heating by means of microwaves.
  • the energy input preferably takes place via the outer coating and not via the material of the base band.
  • the outer coating is then preferably made of a material having the highest possible dielectric loss factor in order to limit microwave heating to the coating.
  • the outer coating is made of PTFE, silicone or PU resin. By material additives whose dielectric constant can be influenced.
  • the baseband may be provided as a material metal that is not heated by microwaves.
  • the Langnip can be limited by a pressure shoe with circulating endless belt in conjunction with a counter-roller as a counter element or in conjunction with a second pressure shoe within a belt loop.
  • the belt loop may be formed according to the endless belt.
  • the counter element can be heated to additionally transfer heat energy to the paper or board web before and / or in the long nip. As a result, the web can pass through the long nip on both sides, which makes smoothing on both sides possible.
  • the invention relates to a calender for smoothing a paper or board web 1 with at least one long nip 2 between two pressing surfaces 3, 4 and a heater 5 for heating the paper or board web 1 for smoothing using pressure and temperature.
  • the at least one pressing surface 3 is formed by a pressure shoe 6 with a continuous endless belt 7, which is supported in the region of the long nip 2 on the pressure shoe 6 arranged within a belt loop.
  • the pressure shoe may be arranged in a known manner on a fixed support 8.
  • the endless belt 7 may be driven or moved by the traveling web 1.
  • the pressure shoe 6 has in a known manner a pressing surface 3, which may be concave or convex curved and is complementary to the pressing surface 4 of a counter element 9.
  • a hydrodynamic and / or hydrostatic lubrication of the endless belt 7 on the pressing surface 3 of the pressure shoe 6 is also in known way.
  • the endless belt 7 is flexible and has a baseband provided with a soft outer coating whose thickness is in the range of 0.1 - 2 mm with a surface hardness of 60 - 98 Shore D.
  • the coating of the endless belt is before the Langnip 2 heatable by means of the heater 5 to form a warm outer skin of the endless belt. 7
  • the web 1 For transferring heat energy to the paper or board web 1 contacted the warm outer skin, the web 1 on a dwelling less than 0.7 sec. Before the long nip 2. The heater 5 is positioned for this purpose with a selectable distance in front of the long nip 2.
  • the outer coating has a surface finish of Ra 0.1-0.5 ⁇ m, and the modulus of elasticity of the outer coating is less than the elastic modulus of the base tape, thereby improving the smoothing of the web 1.
  • the pressure resistance of the outer coating is 5 - 35 N / mm 2 .
  • the outer coating of the endless belt 7 is heated without contact.
  • the heating device 5 is for this purpose preferably formed by a microwave generator, which carries out the heating by means of microwaves.
  • the baseband of the endless belt 7 is preferably made of a metallic material and / or a textile material, in particular using metallic fibers. As a textile material fabrics, knitted fabrics, felts, etc. can be used.
  • the outer coating is preferably made of PTFE (polytetrafluoroethylene), silicone or PU resin, wherein material additives can increase the dielectric loss factor.
  • a heating arranged within the loop of the endless belt 7 then preferably acts essentially only on the outer coating which comes into contact with the web 1 in the elongated nip 2. The heating energy for heating the surface of the web 1 is then substantially only in the outer Coating the endless belt 7 initiated.
  • the outer coating may for example be welded onto the baseband.
  • the endless belt 7 is deflected by guide rollers 10 as a belt loop.
  • the web 1 is guided so that it touches the endless belt 7 in the region of a guide roller 10, which directs the endless belt 7 in the long nip 2.
  • An additional heater 15 may be provided outside the endless belt 7 in order to further improve the heating of the outer coating and / or in addition to heat the baseband of the endless belt 7, wherein the outer coating passes the heat to the web 1.
  • the additional heater 15 is preferably formed by infrared radiators or by an induction device.
  • the counter element 9 may also be formed as a thermo roll.
  • the other pressing surface 4 is according to Fig. 1 formed by a counter element 9 in the form of a counter-roller.
  • the counter-roller can be heated, so that the web 1 heated on both sides can pass through the Langnip. A two-sided smoothing in a long nip is possible.
  • the other pressing surface 4 can be formed by a pressure shoe 12 with a fixed carrier 13 lying within a belt loop 11.
  • the belt loop 11 is formed as a steel strip or according to the endless belt 7.
  • the belt loop 11 can be heated by the heater 5.
  • the belt loop 11 can be heated in two stages, for which purpose an additional external heater 15 is provided.
  • the two endless belts 7, 11 may be formed in the manner of a conveyor belt with upper and lower run, as in Fig. 2 shown.
  • the web 1 is then guided on a dwelling in front of the long nip 2 sandwiched between the endless belts 7, 11 in the long nip 2.
  • the web 1 can then be treated at the top and the bottom just before the long nip 2 with heat energy.
  • a spreader roller 14 may be provided.
  • the pressing surfaces 3, 4 may be formed for setting a pressure profile in the extended nip 2.

Landscapes

  • Paper (AREA)
EP20090004427 2008-05-17 2009-03-27 Calendre Not-in-force EP2119825B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008024082A DE102008024082A1 (de) 2008-05-17 2008-05-17 Kalander

Publications (2)

Publication Number Publication Date
EP2119825A1 true EP2119825A1 (fr) 2009-11-18
EP2119825B1 EP2119825B1 (fr) 2011-01-05

Family

ID=40912115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090004427 Not-in-force EP2119825B1 (fr) 2008-05-17 2009-03-27 Calendre

Country Status (2)

Country Link
EP (1) EP2119825B1 (fr)
DE (2) DE102008024082A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009045416A1 (de) * 2009-10-07 2011-04-14 Voith Patent Gmbh Pressanordnung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920204C2 (fr) 1988-10-31 1991-04-11 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
WO1995034715A1 (fr) * 1994-06-15 1995-12-21 Albany Nordiskafilt Ab Dispositif de calandrage
EP0967324A2 (fr) 1998-06-24 1999-12-29 Voith Sulzer Papiertechnik Patent GmbH Procédé pour le lissage d' une bande de papier
WO2000017446A1 (fr) * 1998-09-22 2000-03-30 International Paper Company Procede et appareil de finissage de carton pour lui donner un lisse et une densite de volume ameliores
EP1195464A2 (fr) * 1996-02-28 2002-04-10 Metso Paper, Inc. Section de séchage avec calandrage intermédiaire dans une machine à papier
EP1314819A2 (fr) * 2001-11-24 2003-05-28 Voith Paper Patent GmbH Calandre et procédé pour le lissage de bandes de papier ou carton
US20060060322A1 (en) * 2002-01-29 2006-03-23 Mika Viljanmaa Processing device for processing a coated or uncoated fibrous web
AT502000B1 (de) 2003-05-30 2007-08-15 Metso Paper Inc Bandaufbau

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4552620A (en) * 1983-09-19 1985-11-12 Beloit Corporation Paper machine belt
FI20020159A (fi) * 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3920204C2 (fr) 1988-10-31 1991-04-11 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
WO1995034715A1 (fr) * 1994-06-15 1995-12-21 Albany Nordiskafilt Ab Dispositif de calandrage
EP1195464A2 (fr) * 1996-02-28 2002-04-10 Metso Paper, Inc. Section de séchage avec calandrage intermédiaire dans une machine à papier
EP0967324A2 (fr) 1998-06-24 1999-12-29 Voith Sulzer Papiertechnik Patent GmbH Procédé pour le lissage d' une bande de papier
WO2000017446A1 (fr) * 1998-09-22 2000-03-30 International Paper Company Procede et appareil de finissage de carton pour lui donner un lisse et une densite de volume ameliores
EP1314819A2 (fr) * 2001-11-24 2003-05-28 Voith Paper Patent GmbH Calandre et procédé pour le lissage de bandes de papier ou carton
DE10157687A1 (de) 2001-11-24 2003-06-12 Voith Paper Patent Gmbh Kalander und Verfahren zum Glätten einer Papier- oder Kartonbahn
US20060060322A1 (en) * 2002-01-29 2006-03-23 Mika Viljanmaa Processing device for processing a coated or uncoated fibrous web
AT502000B1 (de) 2003-05-30 2007-08-15 Metso Paper Inc Bandaufbau

Also Published As

Publication number Publication date
DE102008024082A1 (de) 2009-11-19
EP2119825B1 (fr) 2011-01-05
DE502009000266D1 (de) 2011-02-17

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