EP1645685A1 - Rouleau de calandre et procédé d'entraînement pour un rouleau de calendre - Google Patents

Rouleau de calandre et procédé d'entraînement pour un rouleau de calendre Download PDF

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Publication number
EP1645685A1
EP1645685A1 EP05105710A EP05105710A EP1645685A1 EP 1645685 A1 EP1645685 A1 EP 1645685A1 EP 05105710 A EP05105710 A EP 05105710A EP 05105710 A EP05105710 A EP 05105710A EP 1645685 A1 EP1645685 A1 EP 1645685A1
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EP
European Patent Office
Prior art keywords
heating
temperature
roll
calender
heating medium
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
EP05105710A
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German (de)
English (en)
Other versions
EP1645685B1 (fr
Inventor
Josef Schneid
Thomas Koller
Jochen Autrata
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 Patent GmbH
Voith Paper Patent GmbH
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Publication of EP1645685A1 publication Critical patent/EP1645685A1/fr
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Publication of EP1645685B1 publication Critical patent/EP1645685B1/fr
Expired - Fee Related legal-status Critical Current
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Classifications

    • 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
    • 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
    • D21G1/0286—Regulating the axial or circumferential temperature profile of the roll

Definitions

  • the invention relates to a calender roll having a roll shell having a plurality of Bankffenkanäle which are distributed in the circumferential direction, and a Walkerstoffanschlußan extract for supplying and discharging a heating means, each Walkerstoffkanal is part of a flow path, which is in communication with the Schuschanschlußan ever. Furthermore, the invention relates to a method for operating a calender roll with a roll shell having a plurality of Bankffenkanäle through which directs a heating medium.
  • Calenders serve for the calendering of a paper or board web.
  • the web is guided by nips, which are formed by two cooperating rollers. Of these rollers usually carries an elastic cover. This roller is called a "soft roller".
  • the other roller is designed as a hard, smooth roller. It is usually heated, so that the web can be acted upon not only with an increased pressure, but also with an elevated temperature. Heated calender rolls are also used in so-called wide-nip calenders, in which the heated, hard roll interacts with a shoe roll or a circulating belt.
  • the heating of such a roll is effected by passing a heating medium, for example hot water, hot oil or steam, through the heating medium channels.
  • a heating medium for example hot water, hot oil or steam
  • the Schuffenkanäle are formed as peripheral holes.
  • two adjacent Schuffenkanäle be used to first direct the heating medium in an axial direction through the roll shell and then back in the adjacent Schuffenkanal. Accordingly, the inflow and outflow of the heating medium can be done by a single roll neck.
  • heating not only leads to the desired increased surface temperature, but causes vibrations. This can be observed especially in rolls that are formed of different layers.
  • a roll mantle comprises a core of chilled casting provided with an outer froth layer of white cast, then it is extremely difficult during the course of manufacture to ensure that each layer has exactly the same thickness in the circumferential direction.
  • the roll jacket After completion of the roll jacket, it is possible to ensure that the roll externally has a cylindrical shape, for example by twisting and grinding. However, this cylinder shape is guaranteed only in the cold state. At an elevated temperature there is a risk that the shape of the roll will change because the individual materials have different coefficients of thermal expansion. If the layers do not have a constant thickness in the circumferential direction, then this may cause the roll to become slightly small sags. This then leads to vibrations during operation, which can lead to considerable problems even at low speeds.
  • balancing are fixed in the additional masses in or on the roller, is not always possible because sometimes considerable balance weights with masses of several 100 kg must be used, which are also still attached in the axial center of the roll shell have to.
  • a balancing mass is usually suitable only for a certain speed.
  • the invention has for its object to enable as undisturbed operation.
  • At least one flow path has a tempering, which sets the temperature of the heating means through this flow path to a different value than the temperature of the heating means by another flow path.
  • the tempering rotates with the roller.
  • a temperature distribution is generated in the circumferential direction of the roller, which rotates with the roller. A return deflection of the roller produced by the temperature distribution is thus maintained.
  • the tempering device acts on an inlet to the propellant channel.
  • This has the advantage that practically over the entire length of the Schuffenkanals the heating means with the increased or lowered temperature is supplied. This keeps stresses that may be generated by uneven temperature distribution in the axial direction small.
  • the inlet is often designed as a radial channel in the roll neck. You can now modify the roll neck accordingly and provide the heater there without having to engage excessively in the structure of the roll shell.
  • the tempering device is applied to a section the Schuffenkanals acts. If necessary, this section can also cover the entire length of the heating medium channel. Such a training is particularly recommended if you want to ensure at longer rolls that the temperature differences between the beginning of a Schuffenkanals and its end are not too large.
  • the tempering device is designed as a heating device.
  • heat is supplied to the heating medium in order to locally increase the temperature of the roll shell in the circumferential direction. In many cases, it is easier to increase a temperature by a heating device than to lower a temperature by a cooling device.
  • the heating device preferably has an ohmic heating resistor.
  • an ohmic heating resistor In an ohmic heating resistor, a higher temperature is simply generated by passing electrical current through it. This stream can be adjusted easily. With the adjustment of the current can influence the desired increase in temperature take.
  • the heating resistor flows around the heating medium.
  • the heating resistor is thus within the heating medium. In this way, the heat supplied is completely absorbed by the heating means, so it is not lost in the environment.
  • the heater may include an inductive heater that acts on material that limits the flow path.
  • An inductive heater typically operates on alternating current and generates a magnetic field, which in turn generates eddy currents in conductive materials. By using such conductive materials to confine the flow path, one can heat the walls of the flow path and thus also the heating means.
  • the heating device may have a microwave heating.
  • a microwave heating acts directly on the heating means, which should be liquid in this case.
  • the heating means can be with a microwave heating cause a relatively rapid and accurate increase in temperature.
  • the heater has an infrared heater.
  • An infrared heater works with radiation. For example, one can arrange such a radiation source within a heating medium channel or at its beginning. The radiation then heats the heating medium flowing through and the surrounding areas of the flow path in the desired manner.
  • the flow path has a flow-influencing device
  • the heat transfer from the heater to the heating means affected may be affected.
  • the flow-influencing device may generate turbulence. These turbulences can be used to actually allow as much of the heating means as possible to come into contact with hot surfaces of the heater.
  • the flow-influencing device is adjustable.
  • the device By adjusting the device so you can change the heat transfer from the heater to the heating means and the heating means on the roll shell so that there is the desired temperature distribution in the circumferential direction of the roll shell.
  • This temperature distribution leads to a deflection, which counteracts the "natural" deflection of the roll, which results from an uneven distribution of material.
  • the object is achieved in a method of the type mentioned fact that one generates a heat supply, which varies in the circumferential direction between a minimum and a maximum by tempering the heating means in different Bankstoffkanälen different, and the minimum and maximum with the calender roll to rotate.
  • this procedure produces a thermal deformation of the roll which specifically counteracts the deflection caused by the heating of the roll and possibly non-uniform material distributions. Accordingly, the operation of the roller can be made trouble-free.
  • one Preferably, one generates the minimum and the maximum offset by 180 ° to each other. This has the greatest effect in compensating a deflection.
  • the heating medium is passed through a heating medium channel at a first temperature and through another heating medium channel at a second temperature different from the first temperature.
  • a heating medium channel at a first temperature and through another heating medium channel at a second temperature different from the first temperature.
  • the heating medium channel with the higher temperature of the roll shell is heated more and expands accordingly stronger.
  • heating means at a higher temperature than by a Schuffenkanal on the outside of the deflection.
  • the higher temperature of the Heating means leads to a slight increase in temperature on the inside of the deflection.
  • the roller expands more in the axial direction than on the outside, so that in the initial state (heated roller without different volume flows) occurred deflection is compensated again.
  • the calender roll is heated to an operating temperature, determines a resulting deflection and adjusts the temperatures in the Schuffenkanälen so that the deflection is regressed.
  • This procedure can be carried out with a stationary or slowly rotating roller. Of course, you can also rotate the roller at operating speeds, even if this is unfavorable. From the deflection one can determine, for example, the different lengths of the roll shell on the outside of the deflection and on the inside of the deflection. This difference in length must now be compensated by different thermal expansions.
  • the required temperatures can be calculated. It is also possible to calculate which temperature of the heating means (at a given flow rate) is required to reach this local temperature of the roll. This temperature can now be determined by arranging temperature-influencing means in the individual flow paths, for example a heating or cooling device, a heating device being preferred.
  • Fig. 1 shows a calender roll 1 in a schematic longitudinal section.
  • the calender roll 1 has a roll shell 2, which encloses an interior space 3.
  • At both ends of the roll shell 2 is provided with roll necks 4, 5, which also close the interior 3.
  • Each roll neck 4, 5 carries a stub shaft 6, 7, with which the calender roll 1 can be hung in the stiffening of a calender.
  • connection of adjacent Bankschkanälen 8, 9 takes place in a manner not shown in the right roll neck 5. Due to the steady influx of hot heating means, the calender roll 1 is brought to a higher overall temperature. Surface temperatures of such a calender roll are in the range of 60 ° C to 200 ° C.
  • the calender roll 1 has been heated to its operating temperature, then it may occasionally happen that it bends.
  • the deflection is at a calender roll with a length of the roll shell 2 of 7 m, for example, 0.2 mm. This deflection leads to an imbalance, which leads to significant vibration problems during operation.
  • the heating medium which by the Schuffenkanäle 8, 9 flows, additionally influenced by a temperature control, which may have different configurations.
  • a temperature control which may have different configurations.
  • Fig. 3a to 3e In each case a single type of tempering device is shown in each figure. However, it is readily possible to combine several or even all types of tempering with each other, if necessary or should be favorable.
  • Fig. 3a shows first a radial channel 17, is supplied by the heating means from the heating medium connection 10 to the heating medium channel 8.
  • an ohmic resistor 23 is arranged, which is supplied via a supply device 24 with a predetermined electrical current and a predetermined electrical voltage.
  • the supply device 24 in turn receives its electrical energy via a feedthrough not shown, which is guided for example by the roll neck 4 and the stub shaft 6.
  • the ohmic resistor 23 When current flows through the ohmic resistor 23, its temperature increases. Accordingly, the ohmic resistor 23 outputs heat to the heating means flowing through the radial passage 17 to the heating medium passage 8.
  • the temperature increase does not have to be excessively large. A temperature increase of, for example, 5 to 10 ° C is readily sufficient, as will be explained below.
  • the supply device 24 may be formed, for example, as a secondary side of a transformer and arranged in the stub shaft 7, on the outside of which then the primary side of the corresponding transformer is arranged.
  • the ohmic resistor 23 is arranged in the radial channel 17. But it is also possible to arrange the ohmic resistor 23 in the heating medium channel 8, as shown in Fig. 3b. Again, the ohmic resistance 23 is in the midst of the Schuffenstromes so that it can deliver the heat that he generates virtually completely to the Schuffenstrom.
  • An insert 19 is inserted into the heating medium channel 8 at the end face of the roll mantle 2. After disassembly of the roll neck 4, this end face 20 is freely accessible, so that the insert 19 can optionally be replaced.
  • the insert 19 abuts against a step 21, which is formed by an increase in the diameter of the heating medium channel 8.
  • a flow-influencing device in the form of a throttle valve 22 is arranged in the insert 19, a flow-influencing device in the form of a throttle valve 22 is arranged.
  • the throttle valve 22 which is shown here only schematically, it is possible to selectively supply the heating means to the resistor 23. It may be enough to simply swirl the heating means in the region of the ohmic resistor 23, so that one can ensure that as much heating means as possible actually comes into contact with the ohmic resistor 23. A heat transfer by heat conduction in the heating means is then required only to a lesser extent.
  • FIG. 3 c shows a further alternative, in which the heating device is formed by an inductive heater 25.
  • the inductive heating 25 has two coil pairs 26, 27, which are supplied with an alternating voltage. The frequency of this AC voltage is adjustable.
  • the roll shell 2 is electrically conductive. Accordingly, the alternating magnetic field generated by the coils 26, 27 generates eddy currents in the roll shell, which lead to a heating of the roll shell and thus to a heating of the liquid flowing through the Schuffenkanal 8.
  • the heating by eddy currents can be locally controlled relatively accurately, so that here also targeted a temperature increase can be made by heating the heating medium at certain positions in the circumferential direction of the roller.
  • Fig. 3c shows that in the vicinity of the radial channel 17, a corresponding coil assembly 28, 29 may be provided, so that the heating means can be heated when flowing through the radial channel 17 already.
  • the inductive heating with its coils 26-29 is shown here only schematically. To accommodate the coils here, one will edit both the roll shell 2 and the roll neck 4 accordingly, for example, provided with recesses for receiving the coils 26-29.
  • FIG. 3d shows a further possibility for heating the liquid flowing through individual heating medium channels 8.
  • an ultrasonic generator 30 which acts on the radial channel 17 by flowing liquid, such as water.
  • the ultrasound generator 30 interacts with a second transmitter 31. Both transmitters together form an ultrasonic heater 32.
  • the ultrasonic heater 32 in a manner known per se, causes liquid molecules to oscillate and thereby leads to an increase in the temperature of the liquid flowing through. This temperature increase is specifically limited to individual Schuffenkanäle 8, so that one obtains a non-uniform temperature distribution over the circumference of the roller.
  • FIG. 3 e shows a further possibility of heating the liquid flowing through within individual heating medium channels 8.
  • an infrared heater 33 for example an IR emitter, which acts on the heating medium channel 8 flowing through the liquid.
  • Fig. 4a shows the surface temperature over half the circumference of the calender roll 1. Shown is a wavy curve, which has its maximum at the points of the surface (seen in the circumferential direction), in which heating medium channels 8 are arranged, through which the heating means of the Schuffenanschlußan ever 10th flow away. The minima are located where the heating medium 9 flows back through Schuffenkanäle. The temperature differences between maximum and minimum are of the order of about 1 ° C.
  • Fig. 5a shows the radial expansion of the roll shell in the event that the roll shell 2 is heated uniformly in the circumferential direction.
  • the radial strain at the Top (at 0 ° circumferential angle) is about + 1 mm, represented by a curve 14.
  • the radial expansion at the bottom ie at 180 ° circumferential angle, is about - 1 mm, represented by the curve 15.
  • the center line of the roller, represented by the curve 16 experiences no displacement.
  • the increase in diameter at the left edge is due to the roll neck 4. This "ox yoke" effect is known per se and will not be explained further here.
  • Fig. 5 shows the corresponding radial expansion only for one half (seen in the axial direction) of the roller.
  • Fig. 5b the situation is now shown when the roll shell heated non-uniformly over its circumference.
  • curve 14 ' which indicates the radial deformation on the upper side of the roll, ie at 0 ° circumferential angle, increases towards the axial center of the roll by about 1.35 mm.
  • the radial deformation is less pronounced than in Fig. 5a.
  • the deformation is only about 0.95 mm.
  • the center line (curve 16 ') deforms by about 0.192 mm, which is almost 0.2 mm, about which the roller would be deformed due to its uncompensated deflection, which would be due to uniform heating.
  • the calender roll 1 is first heated to its operating temperature, for example, sets a surface temperature of 175 ° C.
  • the resulting deflection of the calender roll 1 can be determined by measurement. From this deflection results in a difference in length between the outside of the deflection and the inside of the deflection. This difference in length can now be eliminated by heating the roll mantle more strongly on the inner side of the deflection, ie, it conducts heating means at a higher temperature through the heating medium channels 8, 9.
  • the heaters are arranged in heating medium channels which lie on the "inside" of the uncompensated concave bend.
  • the necessary temperature differences are not large. One can therefore produce them within the roll by means of suitable heating devices. Of course, a temperature difference can also be generated by cooling the heating means at certain circumferential positions.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
EP05105710A 2004-10-09 2005-06-27 Rouleau de calandre et procédé d'entraînement pour un rouleau de calendre Expired - Fee Related EP1645685B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004049230A DE102004049230A1 (de) 2004-10-09 2004-10-09 Kalanderwalze und Verfahren zum Betreiben einer Kalanderwalze

Publications (2)

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EP1645685A1 true EP1645685A1 (fr) 2006-04-12
EP1645685B1 EP1645685B1 (fr) 2008-01-30

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EP05105710A Expired - Fee Related EP1645685B1 (fr) 2004-10-09 2005-06-27 Rouleau de calandre et procédé d'entraînement pour un rouleau de calendre

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EP (1) EP1645685B1 (fr)
AT (1) ATE385272T1 (fr)
DE (2) DE102004049230A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109433827A (zh) * 2018-12-26 2019-03-08 邢台汇特金增材制造有限公司 一种智能调节嵌套辊

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1811690A1 (de) * 1968-11-29 1970-07-02 Krauss Maffei Ag Kalanderwalze mit Heizkanaelen
DE29622957U1 (de) * 1996-05-23 1997-09-25 Eduard Küsters Maschinenfabrik GmbH & Co KG, 47805 Krefeld Beheizbare Walze
US6368458B1 (en) * 1998-03-19 2002-04-09 Voith Sulzer Paper Technology North America, Inc. Calender press for a paper-making machine with thermally compensated top and bottom rolls and low nip load
DE20020581U1 (de) * 2000-12-05 2002-04-18 Kuesters Eduard Maschf Beheizbare Walze
DE10048984A1 (de) * 2000-09-27 2002-04-25 Kuesters Eduard Maschf Walzenvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1811690A1 (de) * 1968-11-29 1970-07-02 Krauss Maffei Ag Kalanderwalze mit Heizkanaelen
DE29622957U1 (de) * 1996-05-23 1997-09-25 Eduard Küsters Maschinenfabrik GmbH & Co KG, 47805 Krefeld Beheizbare Walze
US6368458B1 (en) * 1998-03-19 2002-04-09 Voith Sulzer Paper Technology North America, Inc. Calender press for a paper-making machine with thermally compensated top and bottom rolls and low nip load
DE10048984A1 (de) * 2000-09-27 2002-04-25 Kuesters Eduard Maschf Walzenvorrichtung
DE20020581U1 (de) * 2000-12-05 2002-04-18 Kuesters Eduard Maschf Beheizbare Walze

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109433827A (zh) * 2018-12-26 2019-03-08 邢台汇特金增材制造有限公司 一种智能调节嵌套辊
CN109433827B (zh) * 2018-12-26 2024-03-26 常州纳科诺尔精密轧制设备有限公司 一种智能调节嵌套辊

Also Published As

Publication number Publication date
EP1645685B1 (fr) 2008-01-30
DE502005002714D1 (de) 2008-03-20
DE102004049230A1 (de) 2006-04-20
ATE385272T1 (de) 2008-02-15

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