EP2135993A2 - Dispositif de chauffage destiné au chauffage inductif d'un rouleau de calandre - Google Patents

Dispositif de chauffage destiné au chauffage inductif d'un rouleau de calandre Download PDF

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Publication number
EP2135993A2
EP2135993A2 EP09004425A EP09004425A EP2135993A2 EP 2135993 A2 EP2135993 A2 EP 2135993A2 EP 09004425 A EP09004425 A EP 09004425A EP 09004425 A EP09004425 A EP 09004425A EP 2135993 A2 EP2135993 A2 EP 2135993A2
Authority
EP
European Patent Office
Prior art keywords
heating device
inductor
roll
calender roll
ribs
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
EP09004425A
Other languages
German (de)
English (en)
Other versions
EP2135993A3 (fr
EP2135993B1 (fr
Inventor
Eduard Dr. Davydenko
Bernd Jansen
Peter Dr. Svenka
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
Application filed by Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2135993A2 publication Critical patent/EP2135993A2/fr
Publication of EP2135993A3 publication Critical patent/EP2135993A3/fr
Application granted granted Critical
Publication of EP2135993B1 publication Critical patent/EP2135993B1/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
    • D21G1/02—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

  • the invention relates to a heating device for inductive heating of a calender roll according to the preamble of claim 1.
  • the calender roll serves to form a nip with, as a rule, another roller.
  • the nip guides a material web, in particular a paper or board web.
  • the material web is subjected to elevated pressure and in many cases also to elevated temperature.
  • elevated temperature is normally provided by the heating of a calender roll, the so-called thermo roll.
  • the calender roll is supplied to this heat transfer medium.
  • the achievable working temperature is set a limit that ranges from 230 ° C to 250 ° C is.
  • the inductor arrangement preferably has at least one conductor loop with two conductors which extend axially parallel to the roller.
  • the two conductors are in each case in the opposite direction of current, preferably alternating current flows through. These currents then induce a magnetic field that is in the electrically conductive Concentrated deposit and generated there the eddy currents.
  • Another disadvantage here is that the heating is not sufficiently uniform.
  • the object of the invention is therefore to provide a heating device for inductive heating of a calender roll, which allows improved heating of the surface of the working roll circumference of the calender roll.
  • a heating device for inductive heating of a calender roll is provided, with a uniform heating of the calender roll is possible with little effort.
  • the inductor device or an inductor is held straight with high accuracy to the roller. Local deviations from the straightness of the inductor, which would lead to disturbances of the temperature distribution in the surface of the thermo roll, are avoided.
  • the temperature distribution in the surface of the calender roll is markedly improved by reducing the influence of thermal expansion of the supporting parts of the inductor arrangement, caused by heat radiation and / or convection from the heated calender roll.
  • deviations from the straightness of the inductor are minimized.
  • the distance sensitivity of the inductor to the calender roll According to the invention, attention is paid to the fact that the inductor remains straight to the roll circumference practically independent of the respective operating conditions in order to avoid undesired side effects. By a Querverschiebige the inductor with respect to the support beam, this expansion, so that bending of the same is avoided.
  • the inductor is held parallel to the calender roll.
  • the inductor can be mounted transversely displaceable on the ribs and / or the ribs can be formed tiltable.
  • the ribs preferably form spacers for the support beam relative to the calender roller for reducing the heat radiation and / or convection on the support beam.
  • the ribs are preferably thin and long compared to the thickness of a conductor.
  • the inductor preferably has at least one current loop which extends parallel to the axis of the calender roll. The inductor then passes a roller length of the calender roll over the shortest possible distance.
  • the inductor may comprise a current conductor which is a fully-jacketed electrically conductive body.
  • a conductor can be used for supercalendering of paper or board webs.
  • the conductor may be formed as a waveguide, which may also be cooled, for heating the peripheral surface to temperatures above 300 ° C, in particular 350 ° C to 400 ° C, which are used for example in a Langnipkalandr Schl with a shoe calender.
  • the Induktur can be formed for adjusting a power line profile along the calender roll, whereby the edge regions of the calender roll in the nip other Heat quantities can be transmitted as middle ranges.
  • the support beam may be cooled to reduce the thermal expansion thereof by heat radiated from integrated supply units of the inductor device.
  • a protective cover may be provided which forms a heat shield for the inductor and the support beam.
  • Fig. 1 shows a heating device 1 for inductive heating of a circulating in a roller assembly 2 calender roll 3.
  • the calender roll 3 has at least one electrically conductive peripheral surface, which preferably consists of ferro-magnetic material.
  • Such a calender roll 3 interacts with another calender roll 4 and forms with it a nip 5, through which a material web 6 is guided.
  • the material web 6 is subjected to elevated pressure, for which purpose a loading cylinder 7 may be provided, for example, which presses the other calender roll 4 against the heatable calender roll 3.
  • the material web 6 is also subjected to an elevated temperature, for which purpose the calender roll 3 can be heated via the heating device 1.
  • the roll assembly 2 may be a calender with hard and soft rolls to form soft nips.
  • the number of rolls is selectable and is preferably 2 to 8 rolls in a roll stack.
  • the heating device 1 By means of the heating device 1, the hard and / or soft rolls of a roll arrangement 2 can be heated.
  • the inductive heating of roll surfaces requires so far only that at least the surface of the roll circumference of the calender roll 3 is electrically conductive.
  • the calender roll 3 may form an end roll or a center roll in a roll stack. When used as a center roller such a calender roll 3 is rolled over twice, ie forms two nips, through which the material web 6 is guided.
  • the nip 5 can be designed as a hard or soft nip with Nip lengths up to usually 10 mm or as a long nip with Niperyn of usually 40 to 300 mm. Nipronin of over 300 mm are also feasible depending on the use of shoe and belt techniques.
  • the material web 6 is preferably a paper or board web, which is smoothed and compacted in the nip 5.
  • the inductor assembly 8 comprises for this purpose a support beam 10, on which a along a roller length L (see. Fig. 6 ) of the calender roll 3 extending inductor 11 is arranged.
  • the support beam 10 has a plurality of individual mutually spaced, the calender roll 3 zugestter ribs 12.
  • the ribs 12 are fixed to the support beam 10 with a ribbed foot 13 or formed integrally therewith. At the free ends 14 of the ribs 12, the inductor 11 is supported transversely to the support beam 10 from.
  • the support beam 10 is preferably made of non-ferromagnetic material, such as stainless steel V4A.
  • the support beam 10 is also preferably designed as a hollow bar, which is preferably positioned as a spar axially parallel to the calender roll 3.
  • the functional components and supply units for the inductor 11 may be housed. These are, in particular, a generator 15 for the inductor device 11 and cooling devices 16, 17, which can serve to cool the support beam 10 and / or the inductor device 11.
  • cooling lines 18 may be performed on the ribbed feet 13 facing wall of the support beam 10.
  • a cooling of the support beam 10 from the inside with, for example, water promotes that the support beam 10 remains as straight and stable as possible regardless of the respective temperature changes.
  • For the cooling cooling water connections 26 may be provided, as in Fig. 1 shown.
  • the ribs 12 are preferably made of a heat-resistant material and form support elements for the inductor 11, called inductor short.
  • the ribs 12 form a comb-like (see. Fig. 2 and Fig. 6 ) or rake-type front of the support beam 10.
  • the ribs 12 space the support beam 10 with respect to the calender roll 3.
  • the ribs 12 are thus distance sensors.
  • the ribs 12 are thus provided to keep the preferably cooled support beam 10 from the calender roll 3 at a distance and to reduce the heating of the support beam 10 by the calender roll 3.
  • the ribs 12 are made of a material that can not be heated by induction.
  • the inductor device 11 is arranged perpendicular to the ribs 12, in such a way that, for example, the inductor device 11 is mounted transversely displaceable on the ribs 12. For this purpose, a frictional connection between the inductor 11 and the ribs 12 is provided.
  • Such attachment of the inductor device 11 to the ribs 12 may be formed using spring elements 19 as a preloaded attachment, which enables a non-positive, position-displaceable connection between ribs 12 and inductor device 11.
  • the inductor device 11 can then expand freely.
  • the ribs 12 are therefore preferably transverse to the roll axis of the calender roll 3 and the inductor 11 is preferably arranged axially parallel.
  • the ribs 12 are formed so thin that they form bending discs that can perform an elastic tilting movement under load.
  • the fin height is preferably a multiple of the thickness of an electrical conductor 20 of the inductor device 11.
  • the inductor 11 forms with the calender roll 3 at its peripheral portion 9 an air gap 21 in the range of 3 to 50 mm. Adjacent to this air gap 21, the inductor device 11 is positioned with at least one loop-shaped conductor.
  • the loop-shaped conductor has two electrical conductors 20, which are traversed in the opposite direction by current.
  • the two electrical conductors 20 extend parallel to the roll axis 22 of the calender roll 3.
  • the current is an alternating current.
  • the currents flowing through the two electrical conductors 20 generate a magnetic field which is closed by the peripheral portion 9 of the electrically conductive peripheral surface of the calender roll 3 and causes therein to be heated by induced currents.
  • the number and arrangement of the conductors 20 depends on the needs.
  • the penetration depth of the heating in the electrically conductive peripheral region of the calender roll 3 can be controlled.
  • the electrically conductive peripheral surface of the calender roll 3 may be formed by an electrically conductive coating, which was applied in particular by build-up welding on a hollow roll body.
  • the calender roll 3 can also be equipped as a bending compensating roll with inner support elements. Additionally or alternatively, the calender roll 3 may be formed with channels for the passage of a heat transfer medium in order to carry out a basic heating in a conventional manner.
  • the electrical conductor 20 is an electrically conductive body in the form of a waveguide.
  • the waveguide-shaped conductor 20 allows a passage of cooling water. This is the case in particular for high power outputs.
  • the at least two waveguide-shaped conductors 20 are connected to cooling lines 23 for this purpose.
  • a plurality of cooling-water connections 24 can be provided for segment-wise cooling of the conductor (s) 20.
  • Fig. 7 shows the inductor 11 may be formed to adjust a power line profile along the calender roll 3.
  • the edge region of the calender roll 3 may be assigned a further inductor loop 25, which form the inductor device 11 with the conductors 20.
  • a protective cover 28 is preferably provided to protect the inductor 8.
  • the protective cover 28 forms a heat shield.
  • the protective cover 28 preferably comprises individual segments which are fastened to the ribs 12 via bolts 29. Attachment of the protective cover 28 to ribs 12 preferably alternates with attachment of the inductor device 11 to ribs 12. Thus, either the inductor device 11 or the conductors 20 or the protective cover 28 is attached to a rib 12.
  • Fig. 8 shows in a simplified schematic representation of another embodiment of the invention, in which the conductors 20 are formed as Vollmantelleiter. As indicated by a dot and by a cross, the two conductors 20 are traversed in different directions by current to form a conductor loop. In particular, when heating the peripheral surface of the calender roll 3 to lower temperatures, such conductors 20 are sufficient. Also, a protective cover can be omitted. For the rest, the above statements apply accordingly.

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  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP20090004425 2008-06-21 2009-03-27 Dispositif de chauffage destiné au chauffage inductif d'un rouleau de calandre Not-in-force EP2135993B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810029513 DE102008029513B3 (de) 2008-06-21 2008-06-21 Heizvorrichtung zum induktiven Erwärmen einer Kalanderwalze

Publications (3)

Publication Number Publication Date
EP2135993A2 true EP2135993A2 (fr) 2009-12-23
EP2135993A3 EP2135993A3 (fr) 2013-05-29
EP2135993B1 EP2135993B1 (fr) 2014-03-12

Family

ID=40561054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090004425 Not-in-force EP2135993B1 (fr) 2008-06-21 2009-03-27 Dispositif de chauffage destiné au chauffage inductif d'un rouleau de calandre

Country Status (2)

Country Link
EP (1) EP2135993B1 (fr)
DE (1) DE102008029513B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116219791A (zh) * 2023-04-23 2023-06-06 浙江新亚伦纸业有限公司 一种高致密度的纸张压光装置及工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019124244A1 (de) * 2019-09-10 2021-03-11 Andritz Küsters Gmbh Kalander

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3429695C2 (fr) 1984-08-11 1988-09-22 Kuesters, Eduard, 4150 Krefeld, De
DE102005025997A1 (de) 2005-06-07 2006-12-14 Voith Patent Gmbh Kalanderwalzenanordnung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100508815B1 (ko) * 2003-01-08 2005-08-19 국립암센터 β-카테닌 올리고뉴클레오티드 마이크로칩 및 이를이용하여 β-카테닌 유전자의 돌연변이를 검사하는 방법

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3429695C2 (fr) 1984-08-11 1988-09-22 Kuesters, Eduard, 4150 Krefeld, De
DE102005025997A1 (de) 2005-06-07 2006-12-14 Voith Patent Gmbh Kalanderwalzenanordnung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116219791A (zh) * 2023-04-23 2023-06-06 浙江新亚伦纸业有限公司 一种高致密度的纸张压光装置及工艺
CN116219791B (zh) * 2023-04-23 2025-03-28 上海万卷印刷股份有限公司 一种高致密度的纸张压光装置及工艺

Also Published As

Publication number Publication date
DE102008029513B3 (de) 2009-05-20
EP2135993A3 (fr) 2013-05-29
EP2135993B1 (fr) 2014-03-12

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