EP0732443B1 - Kalander für die Behandlung einer Papierbahn - Google Patents
Kalander für die Behandlung einer Papierbahn Download PDFInfo
- Publication number
- EP0732443B1 EP0732443B1 EP96103275A EP96103275A EP0732443B1 EP 0732443 B1 EP0732443 B1 EP 0732443B1 EP 96103275 A EP96103275 A EP 96103275A EP 96103275 A EP96103275 A EP 96103275A EP 0732443 B1 EP0732443 B1 EP 0732443B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- calender
- soft
- roll
- rollers
- roller
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0233—Soft rolls
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
Definitions
- the invention relates to a calender for the Treatment of a paper web with a stack of rollers, the hard and soft rollers as well as between each hard working gap formed by a soft roller , first one and then the other Web side abuts a hard roller.
- Calenders of this type are widely known, for example from the brochure "The New Super Calender Concepts" from Sulzer Papertec from 1994 (code 05/94 d). They are used for the final treatment of a paper web so that it has a desired value for roughness or smoothness, gloss, thickness, bulk and the like. receives, and are set up separately from a paper machine.
- the "soft" or elastic rollers carry a cover consisting mainly of a fiber material.
- the heated rollers have a surface temperature limited to around 80 ° C.
- the average compressive stress in the nips is between 15 and 30 N / mm 2 in normal operation, and values of a maximum of about 40 N / mm 2 have already been used in the lowest working gap.
- So-called compact calenders are also known, where a heated roller with a deflection controllable soft roller forms a gap and for two-sided treatment of the paper web also two such calenders are connected in series can.
- this can only be easily satinized Papers, but not technical papers, e.g. Silicon base papers as well as papers for gravure printing, produce.
- the heatable Rollers therefore have a surface temperature of 160 to 200 ° C. A lot of heat energy is radiated, which must be removed by air conditioning. Because the roller diameter is larger due to the strength than with the supercalender, high line loads must be be applied to achieve a desired satin finish to generate the necessary compressive stresses.
- replacement rollers for the elastic rollers expensive because it is deflectable should be.
- the invention has for its object a calender of the type described at the beginning, the smaller as well as cheaper to manufacture and operate is, but still allows excellent satin results.
- the reference is designed for a compressive strength of over 42 N / mm 2 . This takes into account the fact that, in some cases, it proves expedient to work with a somewhat higher compressive stress.
- the cover preferably consists essentially of fiber-reinforced Epoxy resin.
- a plastic with the properties required above is on the Available on the market, for example under the name "TopTec 4" at Scapa Kern, Wimpassing / Austria.
- top and / or bottom roller deflection are controllable. As a result, the compressive stress equalized across the width of the roll stack.
- At least one working gap limiting roller to a surface temperature can be heated above 100 ° C. In some cases it is moderate temperature increase to a little over 100 ° C Use to with an 8-roll calender or a 2x5-roll calender the same results as with one to achieve the usual 12-roll calender.
- the calender 1 illustrated in FIG. 1 has one Roll stack, which consists of eight rolls, namely a heatable, deflection-controllable hard Top roller 2, a soft roller 3, a heatable hard roller 4, a soft roller 5, a soft Roller 6, a heatable hard roller 7, a soft one Roller 8 and a heated, deflection controllable hard bottom roller 9. Result in this way six working columns 10 to 15, each by one hard roller and a soft roller are limited, and an interchangeable nip 16 formed by two soft rollers 5 and 6 is limited.
- a paper web 17 is fed from a paper machine 18, passes under the guidance of idlers 19 the working column 10 to 12, the alternating gap 16 and the working column 13 to 15, whereupon it in a winding device 20 is wound up.
- the top three Working columns 10 to 12 is the paper web with the one side, in the three lower working columns 13 to 15 with the other side on the hard rollers, see above that the desired surface structure on both sides, for example Gloss or smoothness.
- each of the rollers 2 to 9 has its own drive 21. This enables the paper web 17 to be drawn in during operation.
- Each of the soft rollers 3, 5, 6 and 8 has a cover 22 made of a marking-insensitive plastic, in particular fiber-reinforced epoxy resin, which can also be subjected to a higher compressive stress of, for example, 45 N / mm 2 and more. It is also more resistant to higher temperatures than a fiber material.
- the force P is used to ensure that the mean compressive stress p in the working gaps 10 to 12 and 13 to 15, or at least in the lowest gap, is between 45 and 60 N / mm 2 .
- the surface temperature of the heatable rollers 2, 4, 7 and 9 is between 100 and 150 ° C.
- the diameter of the rollers and the elasticity of the covering 22 are chosen so that there is a gap width of approximately 2 to 15 mm, preferably approximately 8 mm. Depending on the web speed, this leads to dwell times t in each working gap of 0.1 to 0.9 ms. It is preferred if the temperature T is only slightly above the lower limit, for example 110 ° C., and if the compressive stress is only slightly above the lower limit, for example 50 N / mm 2 .
- a 2x5-roll calender 32 is illustrated in FIG. 2, in the first stack a hard top roller 33, a soft roller 34, a hard roller 35, a soft roller 36 and a hard lower roller 37 and in a second stack a hard top roller 38, a soft one Roller 39, a hard roller 40, a soft roller 41 and has a hard bottom roller 42. Every stack therefore has three working columns, that of the paper web 43 are run through in such a way that in the first stack one web surface and in the second stack the other Web surface in contact with the hard rollers is coming.
- the heating of the rollers, the deflection control the top and bottom roller and the load the two roll stacks can be in a similar manner as in Calender of Fig. 1 take place.
- FIG the roughness R as a function of the number n of illustrated column in a 12-roll calender.
- the curve WS applies to the "wireside” and the curve “TS” applies to the "topside” of the paper web. It can be seen that the first four of the "wireside” Column and the last three column and for the “topside” practically only the first four columns matter are. According to the invention is therefore with a lower Number of rollers worked, if necessary with a little increased Values of compressive stress and / or temperature. However, it must now be taken into account that hardly still column are available to go through markings treat damaged paper sufficiently. Therefore become soft rollers with a highly insensitive to marking Plastic cover used.
Landscapes
- Paper (AREA)
Description
- Fig. 1
- eine schematische Darstellung eines erfindungsgemäßen Kalanders,
- Fig. 2
- eine schematische Darstellung einer abgewandelten Ausführungsform und
- Fig. 3
- ein Diagramm der Rauhigkeit über der Zahl der Arbeitsspalte bei einem 12-Walzen-Kalander.
| Metallplättchendicke | Tiefe der bleibenden Verformung | |
| TopTec 4 | Fiberun BD | |
| 0,1 mm | nicht sichtbar | 0,02 mm |
| 0,5 mm | 0,01 mm | 0,21 mm |
| 1,0 mm | 0,03 mm | 0,45 mm |
Claims (6)
- Kalander für die Behandlung einer Papierbahn mit einem Walzenstapel, der harte und weiche Walzen sowie jeweils zwischen einer harten und einer weichen Walze gebildete Arbeitsspalte aufweist, wobei zuerst die eine und dann die andere Bahnseite an einer harten Walze anliegt, dadurch gekennzeichnet,a1) daß der Stapel (5, 6) 6 bis 8 Walzen (2 bis 9) mit einem durch zwei weiche Walzen gebildeten Wechselspalt (61) aufweista2)- oder daß zwei gleichartige Stapel mit je 4 oder 5 Walzen (33 bis 42) vorgesehen sind,b) und daß die weichen Walzen einen Bezug (22) aus einem Kunststoff mit so großem Rückstellvermögen aufweisen, daß die Tiefe der bleibenden Verformung nach Durchlauf einer bis zu 1 mm dicken Störstelle durch den Arbeitsspalt höchstens 5% der Störstellendicke beträgt.
- Kalander nach Anspruch 1, dadurch gekennzeichnet, daß die Tiefe der bleibenden Verformung bei einer Störstellendicke von 1 mm kleiner als 0,04 mm ist und mit abnehmender Störstellendicke überproportional abnimmt.
- Kalander nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Bezug (22) auf eine Druckspannungs-Belastbarkeit über 42 N/mm2 ausgelegt ist.
- Kalander nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Bezug (22) im wesentlichen aus faserverstärktem Epoxidharz besteht.
- Kalander nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß Ober- und/oder Unterwalze (2, 9) durchbiegungssteuerbar sind.
- Kalander nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß zumindest eine einen Arbeitsspalt (10 bis 15) begrenzende Walze auf eine Oberflächentemperatur über 100°C beheizbar ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19508352A DE19508352B4 (de) | 1995-03-09 | 1995-03-09 | Kalander für die Behandlung einer Papierbahn |
| DE19508352 | 1995-03-09 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0732443A1 EP0732443A1 (de) | 1996-09-18 |
| EP0732443B1 true EP0732443B1 (de) | 1998-10-21 |
| EP0732443B2 EP0732443B2 (de) | 2004-05-26 |
Family
ID=7756122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96103275A Expired - Lifetime EP0732443B2 (de) | 1995-03-09 | 1996-03-04 | Kalander für die Behandlung einer Papierbahn |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5704285A (de) |
| EP (1) | EP0732443B2 (de) |
| DE (2) | DE19508352B4 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19547164C1 (de) * | 1995-12-16 | 1997-02-06 | Voith Sulzer Finishing Gmbh | Kalander für die Behandlung einer Papierbahn und Anwendung dieses Kalanders |
| DE19633671C2 (de) * | 1996-08-21 | 1999-03-11 | Voith Sulzer Finishing Gmbh | Kalander |
| DE19711241C2 (de) * | 1997-03-18 | 2002-08-29 | Voith Paper Patent Gmbh | Kalander für Papier und ähnliches Bahnmaterial |
| DE19803323C2 (de) * | 1998-01-29 | 2003-06-05 | Voith Paper Patent Gmbh | Verfahren zur Beeinflussung eines Bahnmaterials, wie Papier, und Kalander zur Durchführung des Verfahrens |
| ATE270728T1 (de) | 2001-03-22 | 2004-07-15 | Kuesters Eduard Maschf | Kalander |
| DE102009046918A1 (de) | 2009-11-20 | 2011-05-26 | Voith Patent Gmbh | Mehrwalzenkalander und Umbauverfahren eines Mehrwalzenkalanders |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2300994A (en) * | 1938-08-09 | 1942-11-03 | Cons Water Power & Paper Co | Calender for paper |
| US3270664A (en) * | 1964-06-22 | 1966-09-06 | Beloit Corp | Calender stack |
| US3841963A (en) * | 1971-07-06 | 1974-10-15 | Kleinewefers Ind Co Gmbh | Apparatus for satinizing fibrous webs |
| JPS5724216A (en) * | 1980-07-21 | 1982-02-08 | Fuji Photo Film Co Ltd | Supercalender |
| FI72768B (fi) * | 1984-11-30 | 1987-03-31 | Waertsilae Oy Ab | Nerkylning av pappersbana i superkalander. |
| FI71374C (fi) * | 1984-12-31 | 1986-12-19 | Valmet Oy | Foerfarande och anordning vid kalandrering av en bana |
| DE3711334A1 (de) * | 1987-04-03 | 1988-10-13 | Escher Wyss Gmbh | Vorrichtung zur fuehrung der walzen eines im wesentlichen vertikalen kalanders |
| US5237915A (en) * | 1992-02-04 | 1993-08-24 | The Mead Corporation | Mixed roll calender |
| DE29504034U1 (de) * | 1995-03-09 | 1995-05-04 | Voith Sulzer Finishing GmbH, 47803 Krefeld | Kalander für die zweiseitige Behandlung einer Papierbahn |
-
1995
- 1995-03-09 DE DE19508352A patent/DE19508352B4/de not_active Expired - Fee Related
-
1996
- 1996-03-04 DE DE59600686T patent/DE59600686D1/de not_active Expired - Fee Related
- 1996-03-04 EP EP96103275A patent/EP0732443B2/de not_active Expired - Lifetime
- 1996-03-07 US US08/612,172 patent/US5704285A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE59600686D1 (de) | 1998-11-26 |
| EP0732443B2 (de) | 2004-05-26 |
| EP0732443A1 (de) | 1996-09-18 |
| US5704285A (en) | 1998-01-06 |
| DE19508352A1 (de) | 1996-09-12 |
| DE19508352B4 (de) | 2005-07-21 |
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