EP0597814A1 - Verfahren zur Heizung einer Walze und beheizter Walze, insbesondere einer Presswalze für eine Papiermaschine - Google Patents

Verfahren zur Heizung einer Walze und beheizter Walze, insbesondere einer Presswalze für eine Papiermaschine Download PDF

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Publication number
EP0597814A1
EP0597814A1 EP93850196A EP93850196A EP0597814A1 EP 0597814 A1 EP0597814 A1 EP 0597814A1 EP 93850196 A EP93850196 A EP 93850196A EP 93850196 A EP93850196 A EP 93850196A EP 0597814 A1 EP0597814 A1 EP 0597814A1
Authority
EP
European Patent Office
Prior art keywords
roll
coating
outer face
mantle
heat transfer
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
EP93850196A
Other languages
English (en)
French (fr)
Other versions
EP0597814B1 (de
Inventor
Juhani Niskanen
Risto Talja
Juhani Vestola
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 Oy
Original Assignee
Valmet Paper Machinery 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
Priority claimed from FI924754A external-priority patent/FI924754A/fi
Priority claimed from FI925634A external-priority patent/FI103679B1/fi
Application filed by Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0597814A1 publication Critical patent/EP0597814A1/de
Application granted granted Critical
Publication of EP0597814B1 publication Critical patent/EP0597814B1/de
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
    • 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
    • D21F3/08—Pressure rolls

Definitions

  • the invention relates to a heatable roll, in particular a press roll or equivalent for a paper machine, which directly contacts a paper web running in the press section of a paper machine.
  • the invention also relates to a method for heating a roll located in a press section in which a heat transfer medium circulates through the roll.
  • granite is used because of its advantageous surface properties which provide controlled detaching of the paper web from a face of the rock roll. Moreover, granite has a high resistance to the wearing effect of a doctor used in the press section.
  • granite is a natural material, its material properties vary.
  • internal flaws in the granite combined with a tendency to crack partly as a result of the internal flaws, form serious obstacles for using granite in some press section applications, particularly applications at high temperatures.
  • a granite roll is heavy and comprises an inhomogeneous material, both factors which increases the tendency of oscillations of the roll constructions which is another significant drawback reducing the operating efficiency of the press section.
  • the heavy weight of a rock roll made of granite is also considered when selecting the dimensions of the lifting equipment and foundations required for the paper machine.
  • Heatable extended-nip presses have been described earlier, e.g., in U.S. Patents 4,738,752 and 4,874,469, whose drawbacks include high consumption of power as a result of the heating of the rolls in the extended-nip.
  • a roll is heated by flowing a heat transfer medium into the roll so that the roll is heated from its interior.
  • An outer face of the roll is provided with a coating made of ceramic, a metal-ceramic mixture, a porous metal or an equivalent material whose thermal conductivity and modulus of elasticity are lower than the corresponding properties of the material of the roll body.
  • a circulating heat transfer medium such as hot water, oil or steam, is used for the heating of the roll.
  • the constant circulation of the heat transfer medium equalizes the temperature differences between different points on the roll and reduces the risk of thermal crown formation.
  • the insulating capacity of the coating 18 must be within certain limits. If the coating material has a high insulating capacity, only a very thin layer is required. However, generally such materials do not have a good resistance to wear, and therefore the layer must be thick. Therefore, these materials are not suitable for use in the invention. As an example of such materials, polymers should be mentioned.
  • the coating layer preferably should have a sufficiently small thickness. This desired property of a thin coating arises from the fact that the force with which the coating layer 18 attempts to change the form of roll mantle 11 is proportional to the thickness of the coating layer.
  • the coating layer must have good resistance to wear even though it will preferably be relatively thin.
  • the coating layer must have a low modulus of elasticity which contributes to a reduction in the forces applied by the coating layer to the roll mantle 11.
  • the ceramic may be an oxide ceramic, for example Zr-, Al-, Si-, Ti-, Y-, Cr-oxide or carbide ceramic, for example Cr-, W-, Ti-, Ni-carbide or a mixture or compound of same.
  • oxide ceramic for example Zr-, Al-, Si-, Ti-, Y-, Cr-oxide or carbide ceramic, for example Cr-, W-, Ti-, Ni-carbide or a mixture or compound of same.
  • metals such as Cr, Ni, Co.
  • the type of porous metal metallic coating 18 used in the invention might be e.g. stainless steel, stellite, bronze, or any other of the metals Ni, Cr, Co, Fe, Al, Cu or a mixture or mixtures thereof.
  • the thermal conductivity and modulus of elasticity of the porous metals will be substantially lower.
  • the thermal conductivity may be as low as about 1/5th and the modulus of elasticity may be as low as about 1/2 of that of commonly used structural materials (i.e. cast iron, steel).
  • Fig. 3 shows a prior art roll without an insulation coating layer
  • Fig. 4 shows a roll in accordance with the invention provided with a coating layer.
  • AT refers to the reduction in temperature in the roll mantle
  • OT refers to the reduction in temperature in the roll mantle
  • ⁇ T 2 refers to reduction in temperature in the insulation coating layer.
  • Fig. 3 the difference in temperature and the distribution of temperature are indicated, the distribution being linear in the roll mantle 11'.
  • the thermal stress a produced on the roll face 18' is proportional to the thermal conductivity a, to the modulus of elasticity E, and to the difference in temperature dT.
  • the equation for the thermal stress is:
  • the force F' that produces deformations, per unit of length 1, is stress (average stress a is half the stress at the surface) times distance from the duct to the surface.
  • the equation for stress is:
  • a body 140 is attached to the stationary roll axle 131.
  • An annular groove 142 which opens axially towards the roll 130 is arranged in the body 140.
  • the medium flows from a heat transfer medium supply hose or pipe 148 through a bore 141 into the annular groove 142. From the annular groove 142, the medium flows through axial bores 144 formed in the roll end 139 to the bores in the roll mantle 138.
  • Axial bores 144 correspond to the amount of bores 138 in the roll mantle and preferably align therewith.
  • Annular seals 145 are arranged between roll axle 131 and the roll end 139 and annular seals 146 are arranged between the roll end 139 and the body 140 attached to the stationary roll axle 131.
  • the heat transfer medium flows into the roll 30,130 through one of its ends (e.g. as illustrated in Figs. 5 and 6) and is removed from the roll through its other end (not shown).
  • the other end is similar to the first end, however, the fluid flow is in an opposite direction.

Landscapes

  • Paper (AREA)
  • Rolls And Other Rotary Bodies (AREA)
EP93850196A 1992-10-20 1993-10-19 Verfahren zur Heizung einer Walze und beheizte Walze, insbesondere Presswalze für eine Papiermaschine Expired - Lifetime EP0597814B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FI924754 1992-10-20
FI924754A FI924754A (fi) 1992-10-20 1992-10-20 Upphettbar vals, i synnerhet en vals foer pappersmaskin
FI925634A FI103679B1 (fi) 1992-10-20 1992-12-11 Kuumennettava tela, etenkin paperikoneen puristintela
FI925634 1992-12-11
US1774593A 1993-02-16 1993-02-16
US17745 1993-02-16

Publications (2)

Publication Number Publication Date
EP0597814A1 true EP0597814A1 (de) 1994-05-18
EP0597814B1 EP0597814B1 (de) 1997-12-10

Family

ID=27241532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93850196A Expired - Lifetime EP0597814B1 (de) 1992-10-20 1993-10-19 Verfahren zur Heizung einer Walze und beheizte Walze, insbesondere Presswalze für eine Papiermaschine

Country Status (4)

Country Link
EP (1) EP0597814B1 (de)
AT (1) ATE161059T1 (de)
CA (1) CA2108624A1 (de)
DE (1) DE69315673T2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997015720A1 (en) * 1995-10-23 1997-05-01 Pulp And Paper Research Institute Of Canada Application of thermal barrier coatings to paper machine drying cylinders to prevent paper edge overdrying
EP0870867A2 (de) * 1997-04-11 1998-10-14 Valmet Corporation Walze für eine Papier- oder Kartonmaschine, Verfahren zur Herstellung der Walze und Zusammensetzung der Beschichtung der Walze
WO2000058554A1 (en) * 1999-03-29 2000-10-05 Metso Paper, Inc. Thermoroll for a paper/board machine or finishing machine and a method for manufacturing the thermoroll
DE10023291A1 (de) * 2000-05-15 2001-11-22 Bhs Corr Masch & Anlagenbau Beheizbare oder kühlbare Walze zur Temperaturbehandlung von Materialbahnen, insbesondere zur Verwendung für Wellpappemaschinen
DE19957795B4 (de) * 1998-12-02 2007-08-16 Metso Paper, Inc. Heizbare Walze
WO2013004732A1 (de) * 2011-07-06 2013-01-10 Voith Patent Gmbh Walze mit verschleissbeständiger antihaft-oberfläche

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012012592U1 (de) * 2012-05-04 2013-07-19 Voith Patent Gmbh Walze

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704776A (en) * 1985-04-30 1987-11-10 Yamauchi Rubber Industry Co., Ltd. Press roll for paper machines
US4738752A (en) * 1986-08-12 1988-04-19 Beloit Corporation Heated extended nip press apparatus
EP0425464A1 (de) * 1989-10-27 1991-05-02 Valmet Paper Machinery Inc. Walze für die Papiererzeugung und Verfahren zu deren Herstellung
EP0471655A1 (de) * 1990-08-15 1992-02-19 Valmet Paper Machinery Inc. Beheizbare Walze
US5171404A (en) * 1990-11-30 1992-12-15 S. D. Warren Company Method and apparatus for calendering paper with internally heated roll

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4704776A (en) * 1985-04-30 1987-11-10 Yamauchi Rubber Industry Co., Ltd. Press roll for paper machines
US4738752A (en) * 1986-08-12 1988-04-19 Beloit Corporation Heated extended nip press apparatus
EP0425464A1 (de) * 1989-10-27 1991-05-02 Valmet Paper Machinery Inc. Walze für die Papiererzeugung und Verfahren zu deren Herstellung
EP0471655A1 (de) * 1990-08-15 1992-02-19 Valmet Paper Machinery Inc. Beheizbare Walze
US5171404A (en) * 1990-11-30 1992-12-15 S. D. Warren Company Method and apparatus for calendering paper with internally heated roll

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6708407B2 (en) * 1909-03-29 2004-03-23 Metso Paper, Inc. Method for manufacturing a thermoroll for a paper/board machine or a finishing machine
WO1997015720A1 (en) * 1995-10-23 1997-05-01 Pulp And Paper Research Institute Of Canada Application of thermal barrier coatings to paper machine drying cylinders to prevent paper edge overdrying
EP0870867A2 (de) * 1997-04-11 1998-10-14 Valmet Corporation Walze für eine Papier- oder Kartonmaschine, Verfahren zur Herstellung der Walze und Zusammensetzung der Beschichtung der Walze
EP0870867A3 (de) * 1997-04-11 1998-11-25 Valmet Corporation Walze für eine Papier- oder Kartonmaschine, Verfahren zur Herstellung der Walze und Zusammensetzung der Beschichtung der Walze
US6200248B1 (en) 1997-04-11 2001-03-13 Valmet Corporation Roll for a paper or board machine
DE19957795B4 (de) * 1998-12-02 2007-08-16 Metso Paper, Inc. Heizbare Walze
WO2000058554A1 (en) * 1999-03-29 2000-10-05 Metso Paper, Inc. Thermoroll for a paper/board machine or finishing machine and a method for manufacturing the thermoroll
DE10023291A1 (de) * 2000-05-15 2001-11-22 Bhs Corr Masch & Anlagenbau Beheizbare oder kühlbare Walze zur Temperaturbehandlung von Materialbahnen, insbesondere zur Verwendung für Wellpappemaschinen
WO2013004732A1 (de) * 2011-07-06 2013-01-10 Voith Patent Gmbh Walze mit verschleissbeständiger antihaft-oberfläche

Also Published As

Publication number Publication date
DE69315673D1 (de) 1998-01-22
DE69315673T2 (de) 1998-04-09
ATE161059T1 (de) 1997-12-15
CA2108624A1 (en) 1994-04-21
EP0597814B1 (de) 1997-12-10

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