EP0277905B1 - Heating method for heating a calender roll - Google Patents

Heating method for heating a calender roll Download PDF

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Publication number
EP0277905B1
EP0277905B1 EP19880630014 EP88630014A EP0277905B1 EP 0277905 B1 EP0277905 B1 EP 0277905B1 EP 19880630014 EP19880630014 EP 19880630014 EP 88630014 A EP88630014 A EP 88630014A EP 0277905 B1 EP0277905 B1 EP 0277905B1
Authority
EP
European Patent Office
Prior art keywords
roll
heat
transfer medium
external surface
heating
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
Application number
EP19880630014
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0277905A3 (en
EP0277905A2 (en
Inventor
Craig A. Shaver
George H. Wong
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.)
Beloit Corp
Original Assignee
Beloit Corp
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=21745372&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0277905(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of EP0277905A2 publication Critical patent/EP0277905A2/en
Publication of EP0277905A3 publication Critical patent/EP0277905A3/en
Application granted granted Critical
Publication of EP0277905B1 publication Critical patent/EP0277905B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • D21F5/024—Heating the cylinders using electrical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/022—Heating the cylinders
    • 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
    • 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
    • D21G1/028—Heating or cooling the rolls; Regulating the temperature using electrical means

Definitions

  • This invention relates to a method for heating a calender roll. More particularly, this invention relates to a method utilizing heat supplied by induction and from a heat transfer medium.
  • a calender includes at least one pair of cooperating rolls which define therebetween, a calendering nip for smoothing and finishing the surfaces of the dried web.
  • the calender rolls may be of polished metal finish or, a combination of one polished metal roll and a soft backing roll.
  • Soft rolls include elastomeric-covered rolls and so-called filled rolls which may include a plurality of compressed cotton discs.
  • DE-A-35 25 950 there is described a method of heating a calender roll according to the preamble of claim 1. More specifically, DE-A-35 25 950 teaches the provision of channels defined by the roll and extending through the roll and utilizes heat supplied by an induction heating means disposed adjacent to the external surface of the roll, the induction heating means extending along substantially the entire length of the roll such that heat is induced in the region of the external surface of the roll. An insulating zone is provided by means of the channels to prevent dissipation of heat inwardly through the roll.
  • the object of the present invention is to overcome the aforementioned problems by the provision of a method of heating a roll operating at such elevated temperatures while reducing the temperature gradients and thermal stresses across the thickness of the calender roll.
  • a heat transfer medium is passed through the channels to supply and transmit the heat from the transfer medium through the roll towards the external surface thereof by conduction, while the induction heating means supplements the heat transmitted by the heating medium in the region of the external surface of the roll.
  • the heating medium is supplied to the roll at a temperature within the range of 204 to 316°C (400 to 600 degrees F.) such that the hazards associated with the use of a heating medium above this temperature range is avoided
  • the heating medium may be supplied at a temperature that is within the range 121-177°C (250-350°C F.) above the temperature of the roll surface.
  • the induction heater induces heat in the region of the external surface of the roll.
  • the heat transferred to the roll by the heat transfer medium maintains this induced heat in the aforementioned region by inhibiting the flow of the induced heat inwardly through the roll away from such region.
  • the present invention relates to a method of heating a calender roll utilizing heat supplied by an induction heater and a heat transfer medium.
  • the method includes the steps of passing the heat transfer medium through the heating channels as defined by the roll for transferring heat from the heating medium to the roll so that the roll is heated.
  • the method also includes the step of energizing an induction heater disposed adjacent to the external surface of the roll, the induction heater extending along the length of the roll such that heat is induced in the region of the external surface of the roll. Furthermore, the heat transfer to the roll from the heat transfer medium inhibits dissipation of the induced heat inwardly through the roll away from the external surface of the roll.
  • the present invention is described particularly relative to a calender for calendering a paper web, it should be appreciated by those skilled in the art that the present invention is not limited to paper web calenders but includes heating apparatus for heating a calender roll used in calendering any web-like material. Furthermore, although the present invention relates to a calender, it should be appreciated that the invention incudes an arrangement where one or more of the calender rolls is replaced by an extended nip provided by a shoe and cooperating blanket.
  • Figure 1 is a side-elevational view of the heating apparatus according to the present invention showing a calender roll and an adjacent induction heater.
  • Figure 2 is a sectional view taken on the line 2-2 of figure 1.
  • Figure 3 is a sectional view taken on the line 3-3 of figure 2
  • Figure 4 is a perspective view of the apparatus shown in figures 1 to 3.
  • Figure 1 is a side-elevational view of a heating apparatus generally designated 10 for heating a calender roll 12.
  • the heating apparatus 10 utilizes heat supplied by an induction heater means generally designated 14 and from a heat transfer medium.
  • Figure 1 shows a web of paper W extending through a calender nip 16 defined by the calender roll 12 and a cooperating soft calender roll 18.
  • the induction heating means 14 includes a ferromagnetic core 20 having a concave surface 22 disposed adjacent to, and partially extending around, the external surface 24 of the calender roll 12.
  • a wire coil 28 extends around the core 20 with opposed ends 30 and 32 of the coil 28 being connected to a source of alternating current 34 such that when the coil 28 is energized by the AC source 34, heat is generated within a region disposed adjacent to the external surface 24 of the calender roll 12.
  • Electromagnetic eddy currents are generated in the ferromagnetic core 20 by one of two methods.
  • a copper wire coil 28 could be wound around the ferromagnetic core 20 so that when an alternating current source 34 is connected to the copper wire coil 28 the eddy currents are generated in the ferromagnetic core 20.
  • a liquid cooled copper tube could be run straight through a length of ferromagnetic core 20 so that when an alternating current source 34 is connected to the copper tube, eddy currents are generated in the ferromagnetic core 20.
  • eddy currents will also be induced in the region of the calender roll external surface 24 which is adjacent to the ferromagnetic core 20. This region of the calender roll external surface 24 will be heated up by the induced eddy currents.
  • Figure 2 is sectional view taken on the line 2-2 of figure 1 and shows the disposition of the induction heater means 14 along substantially the entire length of the calender roll 12.
  • the calender roll 12 defines a plurality of elongate channels which extend along the length of the roll 12.
  • Each individual channel 36-50 as shown in figures 2 and 3 is connected by radial branches 52 and 53 to a central channel 54 which extends through the supportive axle 56 of the calender roll 12.
  • a heat transfer medium such as oil or superheated water is connected to the plurality of heating channels 36 to 50 such that the heat transfer medium circulates throughout the length of the roll calender 12.
  • Figure 3 is a sectional view on the line 3-3 of figure 2 and shows the plurality of longitudinally-extending heating channels 36 to 50 being disposed radially inwards relative to the external surface 24 of the calender roll 12 with each of the longitudinal channels 36 to 50 being equally spaced from the external surface 24.
  • heat is transferred from the heat transfer medium to the calender roll 12 and this heat supplied by the transfer medium inhibits dissipation of heat supplied by the induction heater means 14 inwardly from the external surface 24 and the region adjacent thereto.
  • the heat supplied to the calender roll 12 by the heat transfer medium is supplemented by heat induced by the induction heater means 14 and the stress that would have been applied to the shell, or region of the calender roll 12 in the absence of the induction heater means 14 is avoided. Furthermore, by supplementing the heat supplied by the heat transfer medium with heat from the induction heater 14, the oil or heating medium does not need to be heated above 316°C (600 degrees F.). Therefore, the hazards associated with handling oil or the like, at such elevated temperatures above 316°C (600 degrees F.) is avoided.
  • FIG 4 is a perspective view of the calender roll 12 which may be a supercalender roll and the backing roll, or soft calender roll 18 with the web of paper or paperboard extending through the calender nip 16 defined by these cooperating rolls 12 and 18 respectively.
  • the heat transfer medium is passed through heating channels 36 to 50 which are defined by the calender roll 12 and heat is transferred from the heating medium to the calender roll 12 for heating the roll 12.
  • the induction heater means 14 is energized such that the external surface 24 of the roll 12 is heated.
  • Such induced heating heats not only the external surface 24 of the calender roll 12 but also the region in the vicinity of the external surface 24 of the roll 12.
  • the heat transfer to the roll 12 from the heat transfer medium inhibits dissipation of the induced heat inwardly through the roll 12 away from the external surface 24 of the roll 12.
  • the present invention provides a simple method for supplying supplementary heat to the surface region of a supercalender roll, thereby avoiding the problems of shell stress and the like. Furthermore, the present invention avoids the problems associated with handling an internal heat transfer medium at elevated temperatures.

Landscapes

  • Paper (AREA)
  • General Induction Heating (AREA)
EP19880630014 1987-02-03 1988-02-01 Heating method for heating a calender roll Expired EP0277905B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1035787A 1987-02-03 1987-02-03
US10357 1996-01-19

Publications (3)

Publication Number Publication Date
EP0277905A2 EP0277905A2 (en) 1988-08-10
EP0277905A3 EP0277905A3 (en) 1989-02-22
EP0277905B1 true EP0277905B1 (en) 1992-03-25

Family

ID=21745372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880630014 Expired EP0277905B1 (en) 1987-02-03 1988-02-01 Heating method for heating a calender roll

Country Status (5)

Country Link
EP (1) EP0277905B1 (enrdf_load_stackoverflow)
JP (1) JPS63256791A (enrdf_load_stackoverflow)
CA (1) CA1290818C (enrdf_load_stackoverflow)
DE (1) DE3869440D1 (enrdf_load_stackoverflow)
ES (1) ES2030527T3 (enrdf_load_stackoverflow)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720132A1 (de) * 1987-06-16 1988-12-29 Schwaebische Huettenwerke Gmbh Vorrichtung zur behandlung einer materialbahn
FI892957L (fi) * 1988-07-07 1990-01-08 Eduard Kuesters Maschinenfabrik/Gmbh & Co.Kg Uppvaermnings- och avkylningsfoerfarande foer en uppvaermbar vals och motsvarande vals.
DE3920176A1 (de) * 1988-12-21 1990-07-05 Escher Wyss Ag Walze und verfahren zu deren betrieb
DE4200608C3 (de) * 1992-01-13 1998-12-10 Kuesters Eduard Maschf Steuerung der Temperierung einer temperierbaren Walze
FI109713B (fi) 2001-03-05 2002-09-30 Metso Paper Automation Oy Menetelmä ja laite telan lämmittämiseksi
EP1703018B1 (de) * 2005-03-14 2008-03-12 Walzen Irle GmbH Vorrichtung und Verfahren zum Temperieren von Walzen
DE102005021069A1 (de) * 2005-05-06 2006-11-09 Voith Patent Gmbh Kalander
DE102006017460B4 (de) * 2006-04-13 2012-10-25 Andritz Küsters Gmbh Beheizbare Kalanderwalze
CN107503219A (zh) * 2017-09-23 2017-12-22 东莞市白天鹅纸业有限公司 一种高效的压光辊加热系统
CN115832165B (zh) * 2021-09-18 2024-01-30 宁德时代新能源科技股份有限公司 辊压装置及辊压方法
IT202200011741A1 (it) * 2022-06-03 2023-12-03 Toscotec S P A Macchina per la produzione della carta.
IT202200011735A1 (it) * 2022-06-03 2023-12-03 Toscotec S P A Cilindro monolucido per la produzione della carta.
IT202200011747A1 (it) * 2022-06-03 2023-12-03 Toscotec S P A Cilindro monolucido per la produzione della carta.
IT202200011744A1 (it) * 2022-06-03 2023-12-03 Toscotec S P A Macchina per la produzione della carta.

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL126056C (enrdf_load_stackoverflow) * 1961-07-11
JPS445997Y1 (enrdf_load_stackoverflow) * 1968-06-21 1969-03-04
JPS5119315Y2 (enrdf_load_stackoverflow) * 1972-07-19 1976-05-21
JPS5662664A (en) * 1979-10-25 1981-05-28 Kuroki Kogyosho:Kk Roll for transfer of hot metal piece
JPS6121162Y2 (enrdf_load_stackoverflow) * 1980-08-11 1986-06-25
IT1144234B (it) * 1981-06-16 1986-10-29 Belot Italia Spa Apparecchiatura per il riscaldamento della parete cilindrica di un cilindro rotante di una macchina per la fabbricazione della carta
FI71375C (fi) * 1982-12-14 1986-12-19 Valmet Oy Arrangemang foer upphettning av en vals som anvaends vid pappersframstaellning i synnerhet en kalandervals
DE3429695A1 (de) * 1984-08-11 1986-02-13 Küsters, Eduard, 4150 Krefeld Verfahren zur erzielung eines temperaturprofils im bereich hoher temperaturen an beheizten walzen und entsprechende walzeinrichtung
JPS6166217U (enrdf_load_stackoverflow) * 1984-10-08 1986-05-07
DE3525950A1 (de) * 1985-06-18 1986-12-18 Sulzer-Escher Wyss AG, Zürich Walze zur thermischen behandlung einer warenbahn und deren verwendung
JPS623728A (ja) * 1985-07-01 1987-01-09 旭化成株式会社 釣糸

Also Published As

Publication number Publication date
CA1290818C (en) 1991-10-15
JPS63256791A (ja) 1988-10-24
DE3869440D1 (de) 1992-04-30
JPH0372758B2 (enrdf_load_stackoverflow) 1991-11-19
EP0277905A3 (en) 1989-02-22
EP0277905A2 (en) 1988-08-10
ES2030527T3 (es) 1992-11-01

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