EP1357225B1 - Procédé pour traiter un matériau en bande et calandre - Google Patents

Procédé pour traiter un matériau en bande et calandre Download PDF

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Publication number
EP1357225B1
EP1357225B1 EP20030007710 EP03007710A EP1357225B1 EP 1357225 B1 EP1357225 B1 EP 1357225B1 EP 20030007710 EP20030007710 EP 20030007710 EP 03007710 A EP03007710 A EP 03007710A EP 1357225 B1 EP1357225 B1 EP 1357225B1
Authority
EP
European Patent Office
Prior art keywords
web
calender
roller
nip
moisture
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 - Fee Related
Application number
EP20030007710
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German (de)
English (en)
Other versions
EP1357225A1 (fr
Inventor
Dirk Cramer
Ulrich Rothfuss
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
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 Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1357225A1 publication Critical patent/EP1357225A1/fr
Application granted granted Critical
Publication of EP1357225B1 publication Critical patent/EP1357225B1/fr
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • D21G1/0073—Accessories for calenders
    • D21G1/0093—Web conditioning devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • 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 method for treating a material web in a calender, wherein the web of material in a roll stack of the calender subjected to pressure and elevated temperature and wound after passing through the roll stack of the calender. Furthermore, the invention relates to a calender with at least one nip, which is delimited by a heated roll having roll stacks and with a winding device behind the last nip.
  • Such a method and calender are known from US 6,287,424 B1.
  • a separate roll stack is arranged, which is designed as a "wet stack” with hard rolls.
  • a cooling device is arranged between the two roller stacks.
  • the calender has heaters that act on hard rollers to heat the web.
  • the invention is particularly suitable for the treatment of a paper or board web.
  • the invention will be described below with reference to a paper web as an example of a material web.
  • Paper webs are passed through a calender in the course of their production, where they are subjected to elevated pressure and elevated temperature.
  • the treatment in one Calender the so-called calendering, has several effects. On the one hand it leads to a compression of the paper web, on the other hand it improves surface properties, such as gloss or smoothness.
  • the elevated temperature in the calender causes the fibers to plasticize on the surface of the paper web, facilitating the smoothing process.
  • some moisture of the paper web is advantageous.
  • the paper web suffers a sometimes considerable loss of moisture when passing through the calender. This loss of moisture is basically inevitable. It can be partially compensated by the fact that the paper web is additionally subjected to moisture in the calender.
  • EP 0 957 202 A2 shows a method and a device for the on-line production of SC-A paper.
  • a material web is first precooled in an intermediate cooling section so that it can absorb as much moisture as possible in a vapor deposition device.
  • the temperature increase in the evaporation device is reversed in a cooling section.
  • the material web passes through a calender, wherein it can continue to be acted upon by steam at the entrance of the calender and also in the calender.
  • the steaming at the entrance of the calender should be done so close to the first nip that a moisture gradient remains when the web enters the roll stack of the calender.
  • US 6 061 927 A describes a method for controlling the curl of a paper in the dryer section of a paper machine.
  • the paper web is first passed through a series of drying cylinders in the dryer section and then passed through a coater. Following the coating device, the paper web is dried again, with the last drying cylinders being designed as cooled cylinders. Following the cooled cylinder, the web is then passed through a calender. Between the last cooling cylinder and the calender a steam blower box is arranged, with which moisture can be applied to one side of the web.
  • US 4,277,524 discloses a method and apparatus for treating coated papers.
  • a coated paper web is passed through two nips formed between a hard and polished roll and two soft rolls. After passing through the first nip, the web is passed over two cooling rolls or through a cooling fan and then moistened.
  • US 4,738,197 A describes a process for treating a paper web in a supercalender. Between nips of the calender, the web is passed over cooling rollers so that it gets a lower temperature altogether before entering the nips of the calender. When passing through a nip then only the surface of the web is heated, so that there is a temperature gradient calendering.
  • No. 5,245,920 A describes a method for calendering a paper web in which the paper web is passed through a nip formed by two rolls, at least one of which is heated. Following the nip a cooling device is arranged.
  • the invention has for its object to keep the risk of black satin of the web small.
  • the material web in the calender can be provided with an improved surface, without having to accept an increased risk of black sation.
  • the last nip is bounded by a hard roller and a soft roller and the web is moistened on the side that bears against the soft roller.
  • the material web is moistened before the last nip only on this side.
  • Moistening a web side that does not touch a hard roll basically makes no sense for improving surface properties. For this purpose, it would be necessary to moisten the side of the material web which is on a very smooth surface, i. on the hard roller, rests.
  • the moisture is applied to the other side of the web, i. E. the side which rests on the soft roller, then you take basically no influence on the surface properties. But it increases the moisture content of the web. The moisture can penetrate much better in the material web when resting on the elastic roller.
  • the web is cooled again after moistening.
  • the material web also gets a slightly higher temperature. This slightly higher temperature may well be desired, for example, to be able to exploit the treatment effects in the last nip still with good effectiveness.
  • the increased temperature again entails the risk that too much moisture is lost on the way between the calender and the take-up device. If you now cool the web after moistening, then this risk is reduced.
  • the cooling is preferably carried out after the last nip, ie the web can be treated even in the last nip with an elevated temperature. However, this elevated temperature in the last nip is usually much lower than the temperature of a web without previously done cooling.
  • the material web is covered after leaving the calender and, in particular, vapor-impermeable. If you cover the web, then steam has basically no way to escape, even at an elevated web temperature. This is particularly true when the cover is actually vapor impermeable.
  • a cover can be realized by many plastic materials or metal bands. In this case, the moisture contained in the web is held in the web and not released to the environment. It is not even necessary that the cover is closed at the longitudinal edges of the web. Although some moisture in the form of steam can be lost there. However, this does not matter in principle for the total moisture content of the web.
  • the object is achieved by the calender according to claim 3.
  • the cooling device serves to lower the temperature of the material web, so that less moisture losses occur between the calender and the take-up device due to evaporation of the moisture contained in the material web. It is therefore possible to drive the material web into the calender with an overall lower moisture content, so that black sateen can be effectively avoided by excessive moisture.
  • the cooling of a material web in a calender itself is known from DE 35 42 342 A1. There, however, a cooling device in front of a nip is used to effect a temperature gradient calendering, ie one would like to be able to generate a temperature gradient in the material web in order to achieve different compression behavior over the thickness of a paper web.
  • the moistening device serves to apply additional moisture to the material web, so that the material web as a whole has a higher moisture during winding. This moisture is achieved without having to let the web as a whole with a higher humidity retract into the calender.
  • the moistening after the cooling device has the advantage that you can apply the moisture with a much better efficiency on the web. This makes the operation of the calender and the treatment of the material web economical.
  • the last nip is bounded by a hard roller and an elastic roller and the moistening device is arranged on the side of a material web which bears against the elastic roller.
  • the material web is guided by nips, which are formed by a hard and an elastic roller.
  • the elastic roller is also referred to as a "soft" roller, because its surface is more compliant than the surface of the hard roller.
  • the web is guided in a calender by nips, which are bounded by two hard rolls.
  • the smoothing of the material web takes place basically only on the side which bears against the hard roller.
  • the soft roll merely forms an abutment for the forming in the nip. Therefore, it makes no sense to moisten the voltage applied to the elastic roller side of the web. But if you only moisten this side, then you increase the moisture content of the web without affecting its surface properties.
  • the post-cooler means that a temperature increase experienced by the web in the last nip or before does not result in increased moisture vaporization on the path between the calender and the rewinder.
  • the web can be cooled to a temperature in the range of 50 to 65 ° C, which significantly reduces the evaporation of moisture from the web into the environment. With a corresponding cooling, one can practically halve the moisture losses on the way between the calender and the take-up device.
  • a material web cover is provided behind the last nip, which is preferably formed vapor-impermeable.
  • a material web cover inhibits the escape of steam from the material web. If the material web cover is vapor-impermeable, then the moisture leakage is even more or less completely prevented. Moisture that escapes from the material web can at most reach the cover and condense there. However, it is automatically returned to the material web. It is now possible to cover the material web until it has reached a temperature at which the problem of evaporation no longer plays a decisive role.
  • the moistening device causes a temperature increase of the material web after the cooling device.
  • a slightly elevated temperature is beneficial. It is therefore possible, with the aid of the cooling device, to effect a relatively strong cooling of the material web and then to raise the temperature of the material web again by moistening.
  • the moistening device is designed as a steam humidifier.
  • a steam humidifier applies water vapor to the material web. The water vapor condenses on the material web and thereby contributes to an increase in the moisture content of the material web. At the same time, the temperature of the material web is increased. This leads to an advantageous effect in the treatment in the subsequent last nip.
  • the material web cover extends to a winding or the Nachkühl Surprise.
  • the web cover extends to the take-up device, only a very small amount of moisture is lost between the calender and the take-up device.
  • the material web can then be wound up with an elevated temperature, but also with increased moisture.
  • the material web cover is designed as a cooling device.
  • the material web cover is then no longer used only to prevent the escape of moisture in the form of steam, but at the same time ensures that the temperature of the web is lowered so far that even after leaving the web cover the risk Evaporation and the associated loss of moisture has been significantly reduced.
  • the cooling device is designed as a cooling roller.
  • This is a particularly simple embodiment for the cooling of the material web, which can also be used within the calender.
  • Such a cooling roller may be arranged before the last and / or penultimate nip.
  • Fig. 1 shows a calender 1 with a roll stack 2, which has a series of rollers 3-14, wherein in each case adjacent rolls 3, 4; 5, 6, etc. Form nips 15-25 between them.
  • the nips 15-19 are hereby designed as so-called "soft" nips, i. they are formed between a hard roller 3, 5, 7 and an elastic roller 4, 6, 8.
  • the elastic rollers 4, 6, 8 have a surface covering 26 which makes the surface softer and more flexible than the surface of a hard roller 3, 5, 7.
  • the nips 21-25 are formed as soft nips, i. they are each bounded by a soft roller 9, 11, 13 and a hard roller 10, 12, 14.
  • the middle nip 20 is formed as a change nip, which is formed by two soft rolls 8, 9.
  • the hard rollers 5, 7, 10, 12 are formed as heated rollers, which should be indicated by schematically illustrated heating channels 28.
  • a heat transfer medium can be passed, for example, a hot liquid or steam to pressurize the heated rollers 5, 7, 10, 12 with an increased surface temperature.
  • the increased surface temperature is passed to the web 27 when the web passes through the corresponding nips.
  • the material web thus receives an elevated temperature.
  • the two end rollers 3, 14 and the two middle rollers 8, 9, which limit the Konnip 20 are formed as deflection adjustment, wherein the two central rollers 8, 9 are acted upon in both directions with pressure. This is schematically represented by support shoes 29.
  • the material web 27 is passed between the nips 15-25 via deflection rollers 30. Before the first nip 15, the material web is passed over a guide roller 31. After leaving the last nip 25, the material web is passed over a further guide roller 32.
  • the roll stack 2 is arranged on the upper side of a stand 33, wherein this upper side is inclined by about 45 ° relative to the vertical.
  • a winding device 34 in which the material web 27 is wound into a winding roll 35.
  • the take-up device 34 are still various, not provided with reference numerals guide rollers provided.
  • the material web 27 passes through a series of moistening devices 36, which are designed as steam humidifiers.
  • the moistening devices 36 have the task of moistening the material web 27 and, in particular, of keeping the moisture profile in the transverse direction of the material web 27 as uniform as possible.
  • a cooling roller 37 is arranged, which is slightly larger than the other guide rollers 30. With the cooling roller, the material web 27 is cooled before passing through the last nip. Between the cooling roller 37 and the last nip, a further steam humidifier 38 is arranged as moistening device. This steam humidifier 38 acts on the side of the material web 27, which rests on the soft roll 13 in the last nip 25.
  • the guide roller 32 behind the last nip 25 is also formed as a cooling roller.
  • This arrangement has the advantage that the material web 27 is cooled before leaving the calender 1. Accordingly, not as much moisture can be lost between the last nip 25 and the winding device 34 as with an uncooled material web 27. The evaporation losses are considerably reduced. Assuming that with a web of material 27 leaving the calender 1 uncooled and running to the winder 34, a moisture loss of the order of 2 to 3% occurs, then this moisture loss is now lowered to about 1%. This has the advantageous effect that the web 27 can be retracted with a lower by about 2% moisture in the calender 1 and still with the desired moisture of about 4 to 5% on the winding roller 35 can be wound.
  • the steam humidifier 38 can apply even more moisture to the material web 27.
  • the steam humidifier 38 carries the moisture while on the side of the web 27, which with the elastic Roller 13 comes into contact.
  • the moisture that is applied by the steam humidifier 38 does not serve to increase the smoothness of the material web 27 on the side that comes into contact with the hard and smooth roller 14. It serves exclusively to increase the moisture of the material web 27.
  • the steam humidifier 38 Since the steam humidifier 38 is inserted after the cooling roller 37, the steam emitted by the steam humidifier 38 comes to a much colder material web 27 and can accordingly condense better. This procedure improves the entry of moisture into the material web 27.
  • the temperature increase associated with the steam humidification is reversed by the trained as a cooling roller guide roller 32 after passing through the last nip 25 so that the web 27 after the guide roller 32 only has a temperature in the range of 50 to about 65 ° C.
  • the material web 27 can be retracted with a significantly lower humidity in the calender 1 and also by the humidifiers 36 additionally applied moisture can be kept lower, the risk of a black satin or a mottling has become much lower. However, quality deterioration in surface properties is not observed.
  • FIG. 2 shows a further calender 51 which has only a single nip 52 which is located between a hard and heated roll 53 and a shoe roll 54 is formed.
  • the shoe roll in this case has a circumferential jacket 55, which is correspondingly yielding and is pressed by a support shoe assembly 56 against the hard roller 53.
  • the calender 51 may have further rollers, as shown in dashed lines with a roller 57.
  • the material web 58 which passes through the nip 52, which is formed as a broad nip, is guided in front of the nip 52 via a cooling roller 59. Behind the wide nip 52, as in the embodiment of FIG. 1 also, a take-up device 60 is arranged with a winding roller 61.
  • a first transfer belt 62 is guided through the nip 52.
  • the first transfer belt 62 is formed by a vapor-impermeable plastic. It covers the web 58 on its underside, i. the shoe roll 54 facing side, over a predetermined distance from and that until the web 58 on a cooling roller 63 of the first transfer belt 62 free.
  • the opposite side of the material web 58 is covered by a second transfer belt 64, which is also formed as a plastic band and is impermeable to vapor.
  • a second transfer belt 64 which is also formed as a plastic band and is impermeable to vapor.
  • plastic one can of course also use a metal band for the first and the second transfer belt 62, 64.
  • a sealing arrangement 65 is provided, specifically expediently where the second transfer belt 64 is deflected via a deflection roller 66. This creates a closed space 67 in which, sooner or later, a vapor atmosphere builds up in which the steam has the same pressure as in the material web 58.
  • the material web 58 is lifted off the first transfer belt 62 in the region of a cooling roller 68, the second transfer belt 62 being guided via a deflection roller 69.
  • the second transfer belt 62 is sealed off from the cooling roller 68 by a sealing arrangement 70. This creates a space 71, in which also forms a vapor atmosphere in which the steam has the same pressure as within the material web 58.
  • the cover thus acts as a cooling device here.
  • a moistening device 72 which acts on the side of the material web 58 which bears against the shoe roll 54 or the first transfer belt 62, may also be arranged in front of the nip 52.
  • the material web 58 is thus covered immediately after leaving the nip 52 on one side of the first transfer belt 62, so that there is no leakage of steam. On the opposite side, the steam also can not escape. First, the vapor pressure in the space 67 is counteracted. Later, the other side is covered by the second transfer belt 64.

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  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (9)

  1. Procédé pour traiter une nappe de matériau (27 ; 58) dans une calandre (1 ; 51) comprenant un empilement de cylindres (2) présentant au moins une ligne de contact (15-25 ; 52), la dernière ligne de contact (25 ; 52) étant limitée par un cylindre dur (14 ; 53) et un cylindre mou (13 ; 54), dans lequel procédé on sollicite la nappe de matériau (27 ; 58) dans l'empilement de cylindres (2) de la calandre (1 ; 51) avec de la pression et une température élevée et on l'enroule après le passage à travers l'empilement de cylindres (2 ; 53, 54) de la calandre (1 ; 51), et l'on refroidit la nappe de matériau (27 ; 58) avant la dernière ligne de contact (25 ; 52) de l'empilement de cylindres (2) de la calandre (1) et l'on humidifie la nappe de matériau (27 ; 58) après le refroidissement et avant la dernière ligne de contact (25 ; 52) d'un côté qui s'applique dans la dernière ligne de contact (25 ; 52) contre le cylindre mou (13 ; 54), et l'on refroidit à nouveau la nappe de matériau (27 ; 58) après la dernière ligne de contact (25 ; 52) de la calandre (1) et/ou on recouvre la nappe de matériau (27 ; 58) après la dernière ligne de contact (25 ; 52) de la calandre.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on recouvre la nappe de matériau de manière imperméable à la vapeur.
  3. Calandre comprenant au moins un empilement de cylindres (2) présentant une ligne de contact qui est limitée par un cylindre chauffé (12 ; 53), et un dispositif d'enroulement (34 ; 60) derrière la dernière ligne de contact (25 ; 52) qui est limitée par un cylindre dur (14 ; 53) et un cylindre élastique (13 ; 54), un dispositif de refroidissement (37 ; 59) étant disposé avant la dernière ligne de contact (25 ; 52) et un dispositif d'humidification (38 ; 72) étant disposé entre le dispositif de refroidissement (37 ; 59) et la dernière ligne de contact (25 ; 52), le dispositif d'humidification (38 ; 72) étant disposé du côté d'une nappe de matériau (27 ; 58) qui s'applique contre le cylindre élastique (13 ; 54), un dispositif de post-refroidissement (32 ; 63) étant disposé derrière la dernière ligne de contact (25) et/ou un recouvrement de nappe de matériau (62, 64) étant prévu derrière la dernière ligne de contact (52).
  4. Calandre selon la revendication 3, caractérisée en ce que le dispositif d'humidification (38 ; 72) provoque une augmentation de la température de la nappe de matériau (27 ; 58) après le dispositif de refroidissement (37 ; 59).
  5. Calandre selon la revendication 4, caractérisée en ce que le dispositif d'humidification (38) est réalisé sous forme d'humidificateur à vapeur.
  6. Calandre selon l'une quelconque des revendications 3 ou 5, caractérisée en ce que le recouvrement de nappe de matériau (62, 64) est réalisé de manière imperméable à la vapeur.
  7. Calandre selon l'une quelconque des revendications 3 à 6, caractérisée en ce que le recouvrement de nappe de matériau (62, 64) s'étend jusqu'à un enroulement (60) ou jusqu'au dispositif de post-refroidissement (63).
  8. Calandre selon l'une quelconque des revendications 3 à 7, caractérisée en ce que le recouvrement de nappe de matériau (62, 64) est réalisé sous forme de dispositif de refroidissement (68).
  9. Calandre selon l'une quelconque des revendications 3 à 8, caractérisée en ce que le dispositif de refroidissement (37, 32 ; 63, 68) est réalisé sous forme de cylindre de refroidissement.
EP20030007710 2002-04-23 2003-04-04 Procédé pour traiter un matériau en bande et calandre Expired - Fee Related EP1357225B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10217910 2002-04-23
DE2002117910 DE10217910A1 (de) 2002-04-23 2002-04-23 Verfahren zum Behandeln einer Materialbahn und Kalander

Publications (2)

Publication Number Publication Date
EP1357225A1 EP1357225A1 (fr) 2003-10-29
EP1357225B1 true EP1357225B1 (fr) 2006-12-20

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EP20030007710 Expired - Fee Related EP1357225B1 (fr) 2002-04-23 2003-04-04 Procédé pour traiter un matériau en bande et calandre

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EP (1) EP1357225B1 (fr)
DE (2) DE10217910A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI117402B (fi) * 2004-06-29 2006-09-29 Metso Paper Inc Menetelmä ja järjestely kuiturainan jäähdyttämiseksi
FI20045321A (fi) * 2004-09-02 2006-03-03 Metso Paper Inc Metallihihnakierrolla varustettu kuiturainan käsittelylaite
DE102004062563A1 (de) 2004-12-24 2006-07-06 Voith Paper Patent Gmbh Vorrichtung und Verfahren zum Behandeln einer Materialbahn
EP2682520B1 (fr) 2012-07-03 2016-06-22 Valmet Technologies, Inc. Procédé de production d'une bande fibreuse et ligne de production d'une bande fibreuse

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5588878A (en) * 1978-12-27 1980-07-04 Mitsubishi Paper Mills Ltd Method and apparatus for finishing coated paper
FI72768B (fi) * 1984-11-30 1987-03-31 Waertsilae Oy Ab Nerkylning av pappersbana i superkalander.
DE3922184A1 (de) * 1988-12-22 1990-06-28 Escher Wyss Gmbh Verfahren zum glaetten einer papierbahn
FI96334C (fi) * 1993-11-24 1996-06-10 Valmet Paper Machinery Inc Menetelmä paperin tai vastaavan rainamateriaalin kalanteroinnissa ja menetelmää soveltava kalanteri
FI102093B (fi) * 1997-03-03 1998-10-15 Valmet Corp Rainan viimeistelyosa paperikoneessa
US5983523A (en) * 1997-03-27 1999-11-16 Valmet Corporation Method for controlling curl of paper in a dryer section of a paper machine and a paper or board machine
EP0957202B1 (fr) * 1998-05-08 2004-03-31 V.I.B. Systems GmbH Procédé et dispositif pour la fabrication de papier SC-A online
US6287424B1 (en) * 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness

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DE50306009D1 (de) 2007-02-01
EP1357225A1 (fr) 2003-10-29
DE10217910A1 (de) 2003-11-13

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