EP0814196A2 - Cylindre - Google Patents

Cylindre Download PDF

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Publication number
EP0814196A2
EP0814196A2 EP97109726A EP97109726A EP0814196A2 EP 0814196 A2 EP0814196 A2 EP 0814196A2 EP 97109726 A EP97109726 A EP 97109726A EP 97109726 A EP97109726 A EP 97109726A EP 0814196 A2 EP0814196 A2 EP 0814196A2
Authority
EP
European Patent Office
Prior art keywords
roller
heat exchanger
interior
liquid
tube
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
EP97109726A
Other languages
German (de)
English (en)
Other versions
EP0814196A3 (fr
EP0814196B1 (fr
Inventor
Rolf Dr.-Ing. Van Haag
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.)
Voith Patent GmbH
Original Assignee
Voith Sulzer Finishing 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 Voith Sulzer Finishing GmbH filed Critical Voith Sulzer Finishing GmbH
Publication of EP0814196A2 publication Critical patent/EP0814196A2/fr
Publication of EP0814196A3 publication Critical patent/EP0814196A3/fr
Application granted granted Critical
Publication of EP0814196B1 publication Critical patent/EP0814196B1/fr
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
    • D21G1/02—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
    • 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
    • D21F5/027—Heating the cylinders using a heat-transfer fluid between the heating means and the cylinder shell
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F5/00—Elements specially adapted for movement
    • F28F5/02—Rotary drums or rollers

Definitions

  • the invention relates to a roller with a roller tube which has an elastic covering on its outside.
  • Such rolls are used for example in super calenders or soft calenders. Due to the elastic surface they are often referred to as "soft" rollers.
  • the soft rollers together with so-called “hard” rollers, form a nip through which a material web, for example a paper web, can be passed, the surface of which is to be smoothed by applying pressure and, if appropriate, an elevated temperature.
  • the surfaces of the rollers heat up during operation, partly because of the flexing work performed in the elastic covering.
  • the resulting high temperatures endanger the elastic covering, i.e. the security against destruction of the covering is drastically reduced.
  • roller tube is used as the roller jacket of a deflection-adjusting roller or a deflection roller in which the roller jacket is supported by hydrostatic or hydrodynamic support elements, heat can be transported away by the hydraulic oil inside the roller.
  • this measure for stabilizing the temperature which incidentally occurs in the case of bending adjustment rollers, is relatively complex.
  • peripheral bores in the roll shell in the case of “hard” rolls, through which a heat transfer or cooling medium can flow.
  • the heat absorption or emission of this medium must, however, be kept within relatively narrow limits, so that there is no uneven temperature distribution over the width of the roller.
  • the temperature of the cooling medium when flowing through the peripheral channels may not exceed 1 ° C, at most 2 ° C. The required amount of cooling medium is correspondingly large.
  • the invention has for its object to cool a soft roller in a simple manner.
  • a roller is specified with a roller tube which has an elastic covering on its outside and which surrounds a closed interior in which an evaporable liquid and a heat exchanger are arranged.
  • the roller rotates during operation and thus the roller tube. Under the action of the centrifugal force, the liquid in the interior is pressed against the inner wall of the roller tube. A film of liquid then forms there. Appropriately enough liquid should be present in the interior to form a closed liquid film with a thickness of a few millimeters.
  • This liquid is now supplied with heat from the outside through the roller tube, so that the liquid evaporates.
  • the evaporated liquid i.e. the liquid vapor
  • the heat is then removed through the heat exchanger, i.e. removed from the interior.
  • the steam can then condense on the heat exchanger.
  • the condensate then gets back to the outside wall of the interior, i.e. to the inside of the roller tube, and the cooling circuit starts all over again.
  • the temperature of the heat exchanger can preferably be reduced to a temperature below the condensation temperature of the liquid. It is achieved that the steam does not only condense. Rather, the condensate is cooled further. This allows you to generate a larger temperature difference between the roller tube and the heat exchanger. This improves heat dissipation because the heat exchanger can dissipate a larger amount of heat.
  • the interior is preferably sealed gas-tight. In this case the cooling circuit remains closed, i.e. no "refrigerant" is lost. You can then use not only water as a refrigerant, but also other liquids that have a lower boiling point, for example.
  • the temperature to which the roller tube can heat up can be set within certain limits.
  • the roller is preferably journalled, the journals or parts connected to them closing off the interior at the axial ends. This makes it easy to achieve an all-round gas-tight interior.
  • Such roller journals are characterized by a very low weight, which in turn leads to a desired steep characteristic in the calender. Due to the additional heat exchanger, which is now arranged in the interior of such a roller, the roller can be cooled with simple means, so that the flexing work done in elastic terms has no negative consequences with regard to the roller temperature and the risk of the coating.
  • the heat exchanger preferably rotates together with the roller tube. This has two advantages. On the one hand, it makes it easier to seal the heat exchanger from the roller tube. If the heat exchanger is mounted together with the roller tube, it can be held stationary in the interior, so to speak, so that no gaps between moving parts have to be sealed. On the other hand, the rotating heat exchanger leads to an improved distribution of the liquid condensing on it. Liquid droplets that form from the steam at the heat exchanger are thrown back onto the wall of the roller tube relatively quickly, where they can be evaporated again. As a result, a type of pump is used in the refrigerant circuit.
  • a cooling medium can preferably be supplied to the heat exchanger from the outside.
  • the use of a cooling medium is a relatively simple way to remove heat from the interior of the roller tube. Electrical components with negative temperature coefficients could also be used. However, the effort that has to be done for the amounts of heat to be removed is relatively large.
  • the cooling medium for example a cooling liquid, can be heated relatively strongly in the heat exchanger. One is not limited here to only allowing heating by 1 or 2 ° C. Rather, the coolant can also heat up to 10 ° C, 20 ° C or more. Since the coolant can reach a higher temperature, a correspondingly lower volume flow of the coolant through the heat exchanger is necessary to remove the same amount of heat. Nevertheless, there is no risk of an uneven temperature distribution in the roller tube.
  • At least one pin preferably has a rotary inlet for the cooling medium.
  • a rotary introduction is generally known. Since liquids have to be transferred here, the sealing problem is not as difficult as with gas transmission.
  • the rotary inlet is arranged on one side of the heat exchanger that is not connected to the interior. In this way, there is also no risk that gas or steam can escape from the interior through this rotary inlet.
  • the heat exchanger is advantageously designed as a helically guided tube.
  • the heat exchanger can thus extend over a certain range in the axial direction.
  • the area available for the exchange of heat between the supplied cooling medium and the steam located in the interior is thus increased in a simple manner.
  • An evacuation device is preferably provided for the interior. With such an evacuation device, the pressure prevailing in the interior can be reduced. This lowers the boiling point for the liquid in the interior. It is also possible in this way to influence the temperature of the roller tube. The lower the pressure, the earlier the liquid will evaporate. Since the greatest amount of heat is "consumed" during evaporation, the temperature of the roller tube can be settled in the interior with good nutrition near the boiling point of the liquid.
  • the elastic covering is preferably formed from plastic.
  • suitable plastics are epoxy resins.
  • Plastic coverings can be made highly elastic.
  • a roller rotating drive is preferably provided.
  • This roller rotation drive can also set the roller in rotation when no material web has yet been passed through the roller gap or the roller gap is not yet closed. In this case, the liquid film on the inside of the roller tube is generated before the actual calendering operation starts, so that the cooling can start immediately.
  • a roller 1 has a roller tube 2, which is supported by pins 3, 4 in bearings 5, 6 in a calender, not shown.
  • the bearings 5, 6 can optionally be raised or lowered in the vertical direction or adjusted horizontally in order to open or close a nip 7 with a second roller 8, shown schematically.
  • the pins 3, 4 widen at the roller-side end to the diameter of the roller tube 2, so that they form walls 9, 10 which, together with the roller tube 2, surround or enclose an interior 11.
  • the amount of liquid should be so large that a liquid film with a thickness of a few millimeters forms on the inner wall 13 of the roll tube 2 during operation, that is to say when the roll rotates. This is shown in the figure in that both on the upper inner wall the corresponding liquid film 12 can also be seen on the lower inner wall 13 of the roller tube. Of course, no wavy surface will form there. This representation was only chosen to clarify the term "liquid”.
  • a heat exchanger 14 also projects into the interior 11 and, as is shown schematically, is designed as a helically guided tube. This heat exchanger 14 thus projects axially into the interior 11 over a certain distance.
  • the heat exchanger 14 is provided with connections 15, 16 which are guided through the left pin 4.
  • a static seal 17 is provided here, so that the interior 11 is actually sealed gas-tight.
  • the pin 4 is preferably arranged on the non-drive side or driver's side.
  • a refrigerant can be supplied or discharged through the connections 15, 16, as is shown schematically by the arrows 18. Water can also be used as the refrigerant, for example.
  • the refrigerant is supplied and removed by a rotary inlet 19 known per se. In this rotary inlet, parts that are movable against one another must be sealed. However, this is not critical, since no connection between the interior 11 and the surroundings can be established via this rotary introduction either.
  • the rotary inlet 19 only allows liquids or gases to enter the interior of the heat exchanger 14, ie the side of the heat exchanger 14 that is not connected to the interior 11.
  • the interior 11 is also connected via an evacuation valve 20 to an evacuation connection 21.
  • the evacuation connection 21 can, for example, be connected to a vacuum pump, possibly also a manually operated vacuum pump.
  • the evacuation valve 20 When the evacuation valve 20 is opened, the pressure prevailing in the interior 11 can be reduced, as a result of which the boiling temperature of the liquid 12 in the interior can also be reduced.
  • the outside of the roller tube 2 is provided with an elastic covering 22, which is formed by a plastic, for example epoxy resin.
  • a plastic for example epoxy resin.
  • the covering 22 is tumbled. This generates heat, which leads to an increase in the temperature of the covering 22 and also of the roller tube 2.
  • the roller 1 rotates so that a closed liquid film forms on the inner wall 13 of the roller tube 2 under the action of the centrifugal force.
  • the liquid there on the inner wall 13 is heated and, as soon as the boiling temperature is reached, evaporated.
  • the boiling temperature can be adjusted to a suitable value by selecting a suitable liquid and also by selecting the suitable pressure in the interior 11.
  • the liquid 12 evaporates, it extracts heat from the roller tube 2, so that the interior 11 is then filled with the vapor of the liquid 12.
  • This liquid condenses on the heat exchanger 14, for which purpose a refrigerant, for example cold water, flows through.
  • the heat exchanger 14 rotates together with the roller tube 2, ie liquid, which is deposited here as condensate thrown back against the inner wall 13 of the roller tube 2, where it can be evaporated again.
  • the interior 11 is sealed gas-tight, so that a closed circuit inner wall 13 of the roller tube 2 - heat exchanger 14 - inner wall 13 can result.
  • Liquids 12 other than water can also be used here, for example alcohols or other hydrocarbons.
  • a drive 23 which can set the roller 1 in rotation.
  • This drive 23 acts, for example, on the pin 3.
  • the rotary movement of the roller 1 can therefore begin before the roller gap 7 is closed. You can therefore start cooling the roller before starting operation.
  • the temperature of the refrigerant liquid flowing through the heat exchanger 14 will also not increase, so that no heat exchange takes place. On the other hand, this does not involve excessive cooling of the roller tube 2 and thus of the covering 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP97109726A 1996-06-21 1997-06-14 Cylindre Expired - Lifetime EP0814196B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19624737 1996-06-21
DE19624737A DE19624737A1 (de) 1996-06-21 1996-06-21 Walze

Publications (3)

Publication Number Publication Date
EP0814196A2 true EP0814196A2 (fr) 1997-12-29
EP0814196A3 EP0814196A3 (fr) 1999-01-13
EP0814196B1 EP0814196B1 (fr) 2002-08-28

Family

ID=7797547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97109726A Expired - Lifetime EP0814196B1 (fr) 1996-06-21 1997-06-14 Cylindre

Country Status (5)

Country Link
US (1) US6405790B1 (fr)
EP (1) EP0814196B1 (fr)
JP (1) JP3373758B2 (fr)
CA (1) CA2208293A1 (fr)
DE (2) DE19624737A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001073196A3 (fr) * 2000-03-29 2002-01-10 Metso Paper Inc Procede d'uniformisation de la temperature d'un rouleau de polymere

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19814597C1 (de) 1998-04-01 1999-10-14 Voith Sulzer Papiertech Patent Walze
DE19846520A1 (de) * 1998-10-09 2000-04-13 Voith Sulzer Papiertech Patent Walze, insbesondere Kalanderwalze
FI109137B (fi) * 2000-12-29 2002-05-31 Metso Powdermet Oy Menetelmä paperi- tai kartonkikoneen tai jälkikäsittelykoneen telan telapäädyn valmistamiseksi ja tela, etenkin kuumennettava tela
DE102005000794A1 (de) * 2005-01-05 2006-07-13 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung und/oder Veredelung einer Faserstoffbahn
US8127462B2 (en) 2006-04-21 2012-03-06 Osvaldo Ricardo Haurie Cylindrical dryer having conduits provided within a plurality of holding plates
US7614161B2 (en) * 2006-04-21 2009-11-10 Osvaldo Ricardo Haurie Cylindrical dryer having conduits for heating medium
WO2012083387A1 (fr) * 2010-12-24 2012-06-28 Ezi Fix Mining Solutions Pty Ltd Rouleau
CN105365134A (zh) * 2014-08-29 2016-03-02 上海联净电子科技有限公司 一种高效无结露冷却辊
JP6595368B2 (ja) * 2016-02-23 2019-10-23 株式会社ササクラ 冷却ロール及びその製造方法
DE102019132144A1 (de) * 2019-11-27 2020-11-12 Canon Production Printing Holding B.V. Temperierungswalze zur Temperierung eines Aufzeichnungsträgers

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE225767C (fr)
US2547086A (en) * 1947-06-21 1951-04-03 American Viscose Corp Heating drum
CH540060A (de) * 1971-07-08 1973-08-15 Buehler Ag Geb Verfahren und Vorrichtung zur Temperaturegalisierung einer rotierenden Mahlwalze eines Walzenstuhles
DE2400615A1 (de) * 1974-01-08 1975-07-17 Seico Ind Elektrowaerme Gmbh Einrichtung zur temperierung von walzen, insbesondere von kalanderwalzen
US4183298A (en) * 1977-12-23 1980-01-15 Roland Offsetmaschinenfabrik Faber & Schleicher Ag Water cooled ink roller for printing presses
DE2814244C2 (de) * 1978-04-03 1985-01-10 Kleinewefers Gmbh, 4150 Krefeld Hohlwalze mit koaxial eingebautem Verdrängerkörper
JPS5851528B2 (ja) 1980-03-08 1983-11-17 株式会社 共立機械製作所 繊維機械におけるスピンドルの始動・停止機構
JPS5861318A (ja) 1981-10-06 1983-04-12 Nisshin Steel Co Ltd 熱回収用ロ−ル
JPS6038717A (ja) 1983-08-11 1985-02-28 Akai Electric Co Ltd 情報再生装置
DD225767A1 (de) * 1983-12-08 1985-08-07 Koethen Ing Hochschule Kuehlwalze, insbesondere zum praegen und gravieren von folien
US4631016A (en) * 1985-09-30 1986-12-23 The Dow Chemical Company Film casting apparatus including heat transfer roll
JPS63282393A (ja) 1987-05-09 1988-11-18 株式会社ササクラ 回転ローラ式冷却装置
DE4111911A1 (de) * 1991-04-12 1992-10-15 Voith Gmbh J M Walze
DE4213688A1 (de) * 1992-04-25 1992-11-05 Voith Gmbh J M Verfahren und einrichtung zur kuehlung einer rotierenden walze durch kuehlmittelverdampfung
JP2613549B2 (ja) 1993-09-08 1997-05-28 日本ボールドウィン株式会社 冷却ローラ装置
US5676754A (en) * 1995-03-20 1997-10-14 Advance Systems, Inc. Apparatus for preventing ink resoftening on a printed web as the web travels over a chill roll

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001073196A3 (fr) * 2000-03-29 2002-01-10 Metso Paper Inc Procede d'uniformisation de la temperature d'un rouleau de polymere

Also Published As

Publication number Publication date
EP0814196A3 (fr) 1999-01-13
DE19624737A1 (de) 1998-01-02
US6405790B1 (en) 2002-06-18
JP3373758B2 (ja) 2003-02-04
JPH1089825A (ja) 1998-04-10
DE59708042D1 (de) 2002-10-02
EP0814196B1 (fr) 2002-08-28
CA2208293A1 (fr) 1997-12-21

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