EP1426487A1 - Breitnipkalander - Google Patents
Breitnipkalander Download PDFInfo
- Publication number
- EP1426487A1 EP1426487A1 EP03025269A EP03025269A EP1426487A1 EP 1426487 A1 EP1426487 A1 EP 1426487A1 EP 03025269 A EP03025269 A EP 03025269A EP 03025269 A EP03025269 A EP 03025269A EP 1426487 A1 EP1426487 A1 EP 1426487A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- counter
- pressure element
- roller
- wide nip
- calender according
- 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
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/006—Calenders; Smoothing apparatus with extended nips
Definitions
- the invention relates to a wide nip calender with a revolving band that together with a counter pressure element forms a wide nip, with the tape through a Pressure arrangement in the direction of the counter pressure element is loaded and the counter pressure element is heated.
- Such a wide nip calender is known from US Pat. No. 6,158,333 known.
- Such a wide nip calender is used to a material web, for example a paper or Cardboard web that runs through the wide nip with increased Pressure and elevated temperature.
- a material web for example a paper or Cardboard web that runs through the wide nip with increased Pressure and elevated temperature.
- the wide nip calender in contrast to a Calender in which the nip is counteracted by two Rolling is formed, one in the direction of web travel enlarged treatment route and thus also an enlarged one Has treatment time, it is possible to Web with a slightly reduced compressive stress, for that but to treat over a longer treatment period. This allows good surface properties with a Combine protection of the volume of the web.
- the heating of the counter pressure element in the known case the roller is not without problems.
- The is known Heating with the aid of a heat transfer medium, for example a hot liquid, such as oil, or one hot gas, for example water vapor.
- a heat transfer medium for example a hot liquid, such as oil, or one hot gas, for example water vapor.
- rotating unions are required with those the roller can be heated.
- the invention has for its object the heating options to expand a web in the Breitnip.
- This task is the beginning of a wide nip calender mentioned type in that the pressure arrangement an excitation device of an electrical Has induction heating on the counter pressure element acts.
- the counter pressure element for example a counter pressure roller or a counter pressure belt Heated in the wide nip, where the heat is required to apply the continuous web.
- the induction heating heats up, so to speak the circulating belt.
- the circulating band the is often formed from a plastic material, does not heat itself up. At most it will through the paper web from the counter pressure element with heated. However, this is usually not critical.
- the Induction heating initially affects the surface of the Backpressure element. From there, the heat supplied directly on the material web running through the wide nip transfer. With an appropriate energy supply the induction heater can ensure that the counter pressure element practically no further is heated as necessary so that undesirable thermal stresses avoided with great reliability can be.
- the excitation device preferably has a focusing device on.
- a focusing device will used the magnetic field generated by the excitation device is generated, targeted to certain areas to steer.
- One can therefore measure the energy required to excite the magnetic field is required to better exploit. This increases the efficiency of induction heating.
- one can get interference from the magnetic field may be carried outside can keep it small. This is especially then an advantage if in the neighborhood of the Breitnipkalander electronic devices are to be operated, which may react unexpectedly to a magnetic field.
- the focusing device Has transformation sheets that together with the Back pressure element surround an induction winding arrangement. So you create an almost completely closed one magnetic circuit that is only broken is filled by an air gap that is in operation is through the tape and the one running through the wide nip Web. So practically the whole magnetic energy from the induction winding assembly is excited, entered in the counter-pressure element and used for heating the counter pressure element.
- the excitation device preferably has a electrical supply device with changeable Frequency on.
- Change the power of the electric induction heater There are several ways that Change the power of the electric induction heater. One way is to measure the strength of the To change current that excites the magnetic field. Another option is to set the frequency change. The change in frequency has an impact how deep the magnetic field is in the counter pressure element penetrates. Higher frequencies result in a lower one Penetration depth. So with higher frequencies a smaller line cross section in the counter pressure element available for the electric current, so that here results in a higher temperature. With a change the frequency can also be influenced take how the back pressure element is heated.
- the excitation device preferably acts directly before and / or in a press zone of the wide nip on the Contrasting element.
- the back pressure element has advantages already shortly before the wide nip by induction heat the surface of the counter pressure element already with an elevated temperature in the Breitnip enters. You can then do a combination from the start from increased pressure and increased temperature on the material web let it work.
- the excitement i.e. the heating of the counter pressure element, also in Breitnip to be continued. This ensures that the elevated temperature is also above a predetermined one Time can affect the material web and the temperature of the counter pressure element not due to the heat transfer sinks to the material web. It will rather, new heat is continuously added. Essentially any combination of heating is immediate in front of the press zone and within the press zone of the wide nip conceivable.
- An action of the excitation device preferably ends on the counter pressure element within the press zone. Especially with a counter pressure element with a low Heat capacity drops the temperature of the surface of the counter pressure element after the end of the magnetic Arousal quickly. You can use this to to avoid a "shock" for the material web, when she leaves the wide nip.
- the counter pressure element a surface temperature when exiting the Breitnip of less than 100 ° C.
- flash evaporation occurs on that moisture inside the web evaporates, but in the wide nip due to the Inclusion of the material web between the belt and the Counter pressure element cannot escape, suddenly emerges, if one of the two limits no longer applies. If however, one ensures that the temperature of the train when leaving the Breitnip already below 100 ° C then there is no risk that the moisture evaporated from the web and thereby the Breitnip tears smooth surface.
- the excitation device preferably generates an in Web direction varying heating output.
- the course of the heating power is preferably in the direction of web travel adjustable. So depending on the which material web is treated, the course of the Change the heating output in the wide nip. So that becomes a further flexibility achieved.
- the counterpressure element preferably has one Induction heatable surface layer on a through Induction less heatable support body. With this measure achieves a back pressure element, the itself has a relatively small heat capacity. One can then make sure that the temperature in the wide nip is practical only influenced by the induction heating while the surface temperature is outside of the broad nip relatively quickly to the ambient temperature equalizes. This allows thermal Keep tensions in the counter-pressure element small, especially is advantageous if the counter-pressure element is formed by a roller.
- a wide nip calender shown schematically in FIG. 1 1 has a circulating belt 2, which with a designed as a roller 3 counter pressure element Breitnip 4 forms.
- the tape 2 is through a pressure arrangement 5 with a pressure shoe 6 against the roller 3 pressed.
- a paper or cardboard web 7, the Breitnip 4 passes through, is therefore under the effect of Pressure shoe 6 in the Breitnip 4 initially with increased Pressure applied.
- the pressure shoe 6 has one Pressure surface 8, which is concave and whose Curvature essentially the curvature of the roller 3 is adjusted.
- In the pressure surface 8 can in itself facilities known and therefore not shown to reduce the friction between the belt 2 and the pressure shoe 6 may be provided.
- hydraulic lubrication can be provided here, with a lubricating oil running between the pressure shoe 6 and the tape 2 is fed.
- the winding 9 forms an excitation device of induction heating.
- a Current flows through the winding 9, then this generates Current is a magnetic field that penetrates the roller 3, at least into the surface of the roller. If the roller 3 moved relative to the magnetic field, then a counter current induced in the surface of the roller 3, the in turn, heating the surface of the roller leads. You can still increase the heating output by that an alternating current can flow through the winding 9 leaves. In this case, the alternating current produces one Eddy current in the surface of the roller 3, which is the Heating output further improved.
- the Depth of penetration of an eddy current into the surface of the Roller 3 limited.
- the depth of penetration depends on the Frequency and the material properties of the roller 3. If you choose the frequency so high that the depth of penetration is limited to a few millimeters, then correspondingly only a few millimeters thick heated on the surface of the roller 3. One must not the entire roller 3 or the entire roller shell heat the roller 3 to the necessary temperature in to be able to enter the web 7.
- Transformer plates 10 are provided in the pressure shoe 6. These transformer sheets 10 can be stacked be stacked, so flat in the axial direction of the roller 3 be lined up side by side. Are preferred the transformer sheets 10 electrically against each other isolated. This can be done, for example, by a thin Paint or oxide layer on the surface of the transformer sheets 10 done. In these layered transformer sheets 10 then no eddy currents are formed out. Rather, the transformer sheets act as a focusing device, the entire magnetic field onto the backing roll 3 focus. Spreading losses are kept to a minimum. A magnetic circuit is formed, the itself in the transformer sheets 10 and the counter roller 3 closes. There is practically only one air gap in the Thickness of tape 2 and web 7.
- transformer plates 10th are E-shaped. Other shapes for the transformer sheets are possible if they cause the magnetic field caused by the current in the winding 9 is generated, mainly focused in the counter roll 3 becomes.
- the induction winding 9 heats the roller 3 mainly in the press zone of the wide nip 4.
- a heating length H is given in relation to a pressing length P. From Fig. 3 it can be seen that the heating of the counter roll 3 begins before the press area of the wide nip 4.
- the surface temperature T WO of the surface of the roller 3 then rises even before entering the press zone of the wide nip 4 from about 90 ° C to about 150 ° C, so that the web 7 immediately upon entering the press zone of the wide nip 4 with the hot roller is contacted under pressure.
- the heating ends in the pressing zone of the wide nip 4, so that the surface temperature T WO can cool down to below 100 ° C. again before the web 7 leaves the wide nip 4 in a roller with a correspondingly low heat capacity.
- This avoids flash evaporation, ie the moisture contained in the web 7 can condense before the web 7 leaves the wide nip 4.
- This prevents the steam from escaping from the web 7 when the web 7 leaves the wide nip.
- flash evaporation tears open the surface of the web 7 smoothed in the wide nip 4. Because the heating length is limited to a region that ends in the wide nip 4 and even in the pressing zone of the wide nip 4, flash evaporation is avoided with great reliability.
- Fig. 1 it is shown that the tape 2 is a relative has great thickness.
- Such a thick band runs on kind of a roller around and is usually on the end faces closed over end plates. It is also possible to use a thinner tape 2 that through Deflection pulleys is circulated.
- Fig. 2 shows an alternative embodiment in which same parts with the same reference numerals as in Fig. 1 are provided.
- the counter pressure element is in this Case not designed as a roller 3, but as Steel band 11, which rests on a support shoe 12, when the pressure shoe the band 2 against the steel band 11 suppressed.
- a wide nip 4 is also realized in this way.
- the induction winding 9 heats the steel strip 11 when electricity flows through them.
- the support shoe can also be heated. Preferably but you set the frequency of the induction winding so that only the steel strip 11 is heated.
- a supply device is shown schematically 13, which supplies the winding 9 with current.
- the utilities 13 is able to adjust the frequency of the To change current. There is an adjustment input f intended.
- Fig. 4 shows a preferred embodiment of the roller 3.
- the roller 3 has a roller axis 14 on the an insulating body 15 is arranged.
- the insulating body 15 brings about thermal insulation of the roller axis 14 of a jacket 16, which as a thin layer on the Insulating body 15 is provided.
- 4 is the coat 16 exaggerated thick. It is real much thinner in the radial direction.
- a single winding 9 is shown with which a Magnetic field in the counter roller 3 or the steel belt 11 is induced. You can of course in the direction of the Also arrange several windings so that the Possibility gets the heating output in the direction of rotation to change the web.
- the heating power can, for example increase or decrease or the same stay. If each winding can be controlled separately, then the heating of the Counter-pressure element, so the counter-roller 3 or Change steel band 11 during operation.
Landscapes
- Paper (AREA)
- General Induction Heating (AREA)
- Polarising Elements (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Description
- Fig. 1
- eine erste Ausführungsform eines Breitnipkalanders in schematischer Darstellung,
- Fig. 2
- eine zweite Ausführungsform eines Breitnipkalanders,
- Fig. 3
- eine Darstellung eines Heizverlaufs und
- Fig. 4
- eine schematische Darstellung einer Gegendruckwalzee.
Claims (10)
- Breitnipkalander mit einem umlaufenden Band, das zusammen mit einem Gegendruckelement einen Breitnip bildet, wobei das Band durch eine Andruckanordnung in Richtung auf das Gegendruckelement belastet ist und das Gegendruckelement beheizbar ist, dadurch gekennzeichnet, daß die Andruckanordnung (5) eine Erregereinrichtung (9) einer elektrischen Induktionsheizung aufweist, die auf das Gegendruckelement (3, 11) wirkt.
- Kalander nach Anspruch 1, dadurch gekennzeichnet, daß die Erregereinrichtung (9) eine Fokussierungseinrichtung (10) aufweist.
- Kalander nach Anspruch 2, dadurch gekennzeichnet, daß die Fokussierungseinrichtung (10) Transformatorbleche aufweist, die zusammen mit dem Gegendruckelement (3, 11) eine Induktionswicklungsanordnung umgeben.
- Kalander nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Erregereinrichtung (9) eine elektrische Versorgungseinrichtung (13) mit veränderbarer Speisefrequenz (f) aufweist.
- Kalander nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Erregereinrichtung (9) unmittelbar vor und/oder in einer Preßzone des Breitnips (4) auf das Gegendruckelement (3, 11) wirkt.
- Kalander nach Anspruch 5, dadurch gekennzeichnet, daß eine Einwirkung der Erregereinrichtung (9) auf das Gegendruckelement (3, 11) innerhalb der Preßzone endet.
- Kalander nach Anspruch 6, dadurch gekennzeichnet, daß das Gegendruckelement (3, 11) beim Austritt aus dem Breitnip (4) eine Oberflächentemperatur (TOW) von weniger als 100° C aufweist.
- Kalander nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Erregereinrichtung (9) eine in Bahnlaufrichtung variierende Heizleistung erzeugt.
- Kalander nach Anspruch 8, dadurch gekennzeichnet, daß der Verlauf der Heizleistung in Bahnlaufrichtung einstellbar ist.
- Kalander nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Gegendruckelement (3) eine durch Induktion erwärmbare Oberflächenschicht (16) auf einem durch Induktion weniger gut erwärmbaren Tragkörper (15) aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10256998A DE10256998B4 (de) | 2002-12-06 | 2002-12-06 | Breitnipkalander |
DE10256998 | 2002-12-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1426487A1 true EP1426487A1 (de) | 2004-06-09 |
EP1426487B1 EP1426487B1 (de) | 2007-01-24 |
Family
ID=32309010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03025269A Expired - Fee Related EP1426487B1 (de) | 2002-12-06 | 2003-11-06 | Breitnipkalander |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1426487B1 (de) |
AT (1) | ATE352668T1 (de) |
DE (2) | DE10256998B4 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1688537A1 (de) * | 2005-02-04 | 2006-08-09 | Voith Paper Patent GmbH | Kalander |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0337973A2 (de) * | 1988-04-13 | 1989-10-18 | Valmet Paper Machinery Inc. | Verfahren und Vorrichtungen zur Druckbehandlung einer Papierbahn |
US5071513A (en) * | 1986-12-24 | 1991-12-10 | Sulzer-Escher Wyss Gmbh | Method for the mechanical-thermal dewatering of a fiber stock web |
DE4322876A1 (de) * | 1993-07-09 | 1993-11-18 | Voith Gmbh J M | Vorrichtung zum Glätten einer Papierbahn oder Kartonbahn |
WO1993023613A1 (de) * | 1992-05-16 | 1993-11-25 | Sulzer-Escher Wyss Gmbh | Verfahren zum trocknen einer papierbahn und anordnung zu seiner durchführung |
WO2003035978A1 (en) * | 2001-10-25 | 2003-05-01 | Metso Paper, Inc. | Method for treating a paper or paperboard web and a treatment device for a paper or paperboard web |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9804347D0 (sv) * | 1998-12-16 | 1998-12-16 | Valmet Corp | Method and apparatus for calendering paper |
-
2002
- 2002-12-06 DE DE10256998A patent/DE10256998B4/de not_active Expired - Fee Related
-
2003
- 2003-11-06 AT AT03025269T patent/ATE352668T1/de active
- 2003-11-06 DE DE50306364T patent/DE50306364D1/de not_active Expired - Lifetime
- 2003-11-06 EP EP03025269A patent/EP1426487B1/de not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5071513A (en) * | 1986-12-24 | 1991-12-10 | Sulzer-Escher Wyss Gmbh | Method for the mechanical-thermal dewatering of a fiber stock web |
EP0337973A2 (de) * | 1988-04-13 | 1989-10-18 | Valmet Paper Machinery Inc. | Verfahren und Vorrichtungen zur Druckbehandlung einer Papierbahn |
WO1993023613A1 (de) * | 1992-05-16 | 1993-11-25 | Sulzer-Escher Wyss Gmbh | Verfahren zum trocknen einer papierbahn und anordnung zu seiner durchführung |
DE4322876A1 (de) * | 1993-07-09 | 1993-11-18 | Voith Gmbh J M | Vorrichtung zum Glätten einer Papierbahn oder Kartonbahn |
WO2003035978A1 (en) * | 2001-10-25 | 2003-05-01 | Metso Paper, Inc. | Method for treating a paper or paperboard web and a treatment device for a paper or paperboard web |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1688537A1 (de) * | 2005-02-04 | 2006-08-09 | Voith Paper Patent GmbH | Kalander |
Also Published As
Publication number | Publication date |
---|---|
ATE352668T1 (de) | 2007-02-15 |
DE50306364D1 (de) | 2007-03-15 |
DE10256998B4 (de) | 2006-04-06 |
DE10256998A1 (de) | 2004-07-08 |
EP1426487B1 (de) | 2007-01-24 |
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