EP1614802A1 - Procédé et appareil pour le traitement d' une bande de papier ou carton - Google Patents

Procédé et appareil pour le traitement d' une bande de papier ou carton Download PDF

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Publication number
EP1614802A1
EP1614802A1 EP05104603A EP05104603A EP1614802A1 EP 1614802 A1 EP1614802 A1 EP 1614802A1 EP 05104603 A EP05104603 A EP 05104603A EP 05104603 A EP05104603 A EP 05104603A EP 1614802 A1 EP1614802 A1 EP 1614802A1
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EP
European Patent Office
Prior art keywords
web
calender
drying
moisture content
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.)
Granted
Application number
EP05104603A
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German (de)
English (en)
Other versions
EP1614802B1 (fr
Inventor
Ingolf Cedra
Holger Humberg
Johann Moser
Frank Wegehaupt
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 Paper 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.)
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Publication date
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Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1614802A1 publication Critical patent/EP1614802A1/fr
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Publication of EP1614802B1 publication Critical patent/EP1614802B1/fr
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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

Definitions

  • the invention relates to a method of treating a web of paper or paperboard in which the web is moistened on at least one side and then passed through a calender having a plurality of soft nips bounded by a hard and a soft roll having an elastic surface. Further, the invention relates to a device for treating a web of paper or cardboard with a calender comprising a plurality of soft nips, each formed between a hard roll and a soft roll having an elastic surface, and a moistening device in the running direction of the web in front of the calender ,
  • the invention has for its object to improve the processability of the web.
  • This object is achieved in a method of the type mentioned in that the web is dried between the moistening and the passing through the calender.
  • the moisture content of the web is adjusted by drying to a value which is 0.5 to 3%, in particular 0.5 to 1%, lower than the moisture content before drying.
  • a value which is 0.5 to 3%, in particular 0.5 to 1% lower than the moisture content before drying.
  • the moisture content of the web is lowered again by drying after wetting. However, this reduction is not as pronounced as over drying the web before applying the moisture.
  • the drying is limited to a surface layer of the web.
  • the compressibility of a central region of the web is practically unaffected.
  • the compressibility of the outer layers of the web is retained. Only in a region between the outer layer and the middle layer is the web more compacted. However, the good surface properties of the web are retained. It should be noted that even after drying, the surface of the web is not completely dry or overdried, such as at the exit of a dryer section.
  • the web is adjusted to a moisture content of not more than 7%, in particular not more than 4%.
  • This setting can be made in the dryer section. The train is so overdried so to speak. This not only makes it easier to keep the middle area of the track dry after wetting. Also, the setting of the above-mentioned moisture profile, in which the maximum of the moisture is not on, but below the surface, is facilitated.
  • the web is moistened to a moisture content of at least 8%, in particular at least 10%. These values have been found to be optimal for the subsequent calendering. This also applies if the web is dried again on the surface after moistening.
  • the web is moistened so close to the calender that the moisture content in the web center when passing through the first nip of the calender is at most 1.3 times the moisture content of the web before wetting. It prevents so that the moisture spreads evenly in the web.
  • the middle part of the track should stay relatively dry. This has, as is known, the effect of compressing the middle region less strongly.
  • the web is preferably dried by infrared radiation, contact drying or suspension drying after wetting. These drying methods have the advantage of acting only on the surface of the web. This achieves that only the surface area of the web is dried and possibly a small area below the surface. This results in having a relatively large area within the web which still has some moisture. Only this area is not on, but below the surface.
  • the object is achieved in a device of the type mentioned above in that a drying device is arranged between the moistening device and the calender.
  • the web After applying the moisture, the web is dried again. This has the positive effect that in any case the surface is provided with a lower humidity. The compressibility of the surface is thus retained, so that later the printability is improved. In addition, the flatness improves.
  • the drying device is designed as a surface-drying device.
  • the web is thus heated only on its surface and dried there.
  • This has in addition to the advantages described above, in addition, the effect that the order of the Moisture does not have to pay so much attention that the applied moisture can be completely absorbed by the web. A small excess of moisture is quite permissible. This is removed in the surface drying device. Surface damage, which could occur, for example, by rapid evaporation of the free water on contact of the web with a hot roller in the calender, is avoided with relatively high reliability.
  • the drying device is designed as an infrared dryer, contact dryer or floating dryer. All three drying devices act on the web over the surface, thus leading to the fact that first a layer is dried on the surface of the web, without a corresponding drying takes place directly in deeper areas of the web.
  • the moistening device is arranged so close to the calender that the moisture content in the web center when passing through the first nip of the calender is at most 1.3 times the moisture content of the web before the moistening device. It is thus admitted that some moisture also gets into the central region of the web. However, complete moisture balance over the web has not yet occurred. The middle of the track thus remains much drier than the rest of the track, so that the middle of the track is less is highly compressed when the web is pressurized in the nips of the calender.
  • the drying device is arranged so close to the calender, that in a layer below the surface of the web there is a higher humidity than in a layer on the surface. After drying the surface of the web, moisture equalization immediately commences across the thickness of the web. But this moisture balance needs a certain amount of time. It arranges the drying device so close to the calender that this compensation has not yet taken place. So you get a moisture profile in which the maximum of moisture is not on the surface, but below the surface. In a two-sided moistened and intermediately dried web, one thus obtains an M-shaped or W-shaped profile of the moisture distribution.
  • FIG. 1 shows a device 1 for treating a paper or board web 2, which will also be referred to below as "web" 2 for short.
  • the web 2 comes from a paper or board machine, then passes through a moistening device 4, a drying device 5 and a calender 6, before being wound up in a winding 7 on a winding roll 8 or a drum. Between the calender 6 and the winding 7, a treatment device 9 shown schematically may be provided. In the treatment device 9, the web 2, for example, be moistened again.
  • the web 2 is relatively strongly dried in the paper or board machine 3, more precisely in its drying section. It is overdried, i. their moisture is reduced to a value that is no longer sufficient for the satinization of the web 2 in the calender 6.
  • the web 2 has, for example, a moisture content of at most 7%, preferably even a maximum of 4%.
  • the web 2 After leaving the drying section of the paper or board machine 3, the web 2 then passes through the moistening device 4, in which it is moistened from the surface. In other words, you wear in the humidifier 4 moisture in the form of vapor or a spray on the surface of the web 2 on.
  • the moisture application can be done on two sides, so that both sides of the web 2 are provided with an increased humidity.
  • the surface layers of the web 2 are designed with a higher moisture content than the middle of the web 2. Since the compression of the web 2 in the calender 6 also depends on the moisture content of the web 2, the middle layer of the web 2 is correspondingly less compressed than the outer layers of the web 2. For this purpose, the surface of the web 2 is better smoothed.
  • the calender 6 consists in a conventional manner of a plurality of rollers 10-17, which form between them nips 18-24.
  • the two end rollers 10, 17 and the intermediate rollers 12, 14 and 15 are formed as soft rollers with an elastic coating 25 on the surface.
  • the remaining rollers 11, 13 and 16 are formed as hard rollers whose surface is not as resilient as the surfaces of the soft rollers 10, 12, 14, 15, 17.
  • the hard rollers 11, 13, 16 be heated.
  • the nips 18-21, 23, 24 are formed as soft nips.
  • the nip 22 is designed as a changeover tip, which is bounded by two soft rollers 14, 15 is. With such a calender 6, it is possible to rest both sides of the web in at least two nips each on a hard and heated roller 11, 13, 16.
  • a drying device 5 is provided between the moistening device 4 and the calender 6, which is designed as a surface-drying device.
  • the web 2 is dried from the surface.
  • the drying device 5 has the advantage that one removes part of the moisture from the surface of the web 2. Although this has a small detrimental effect on the calender 6 forming smoothness. But also the surface of the web 2 is less compressed, which later has a positive effect on the processability. In particular, the ink absorption of the web during printing is better. This is especially true for gravure printing. Since the near-surface layers can still have a considerable moisture, good smoothness and a sufficient gloss continue to result. By drying the Surface results in an improvement in the uniformity of the moisture in the lying parallel to the surface plane of the paper and thus an improved flatness and improved uniformity of gloss and smoothness after passing through the calender 6, so after the calendering.
  • the web 2 has previously been moistened on both sides, then it is also dried on both sides in the drying device 5. If only one side has been moistened then drying of the moistened side is sufficient.
  • the further explanation is made on an embodiment in which both sides of the web 2 have been moistened. However, the skilled person will be able to make a one-sided moistening and a one-sided drying according to the method described here without difficulty.
  • the moisture content of the web 2 after leaving the paper or board machine 3 is then at least 8%, preferably even at least 10%. This moisture content is again slightly reduced when passing through the drying device 5.
  • the moisture content after the drying device should be at least 0.5 to 3%, preferably 0.5 to 1%, lower than before the drying device 5.
  • the moisture content of the web 2, after passing through the moistening device 4, for example 10% located has, after passing through the drying device 5 at 7 to 9.5%, preferably 9 to 9.5%.
  • the moistening of the web in the moistening device 4 and the drying of the web 2 in the drying device 5 must take place relatively shortly before the calender.
  • the time between the passage of the moistening device 4 and the passage of the first nip 18 of the calender 6 should be a maximum of 2 seconds, preferably even a maximum of 1 second, to prevent the moisture from being equalized across the thickness of the web.
  • the middle of the web should therefore preferably remain relatively dry. It should not be greater than 30% above the moisture of the web when leaving the paper or board machine 3. If the moisture there was set at 4%, then the moisture content of the center of the web 2 should be in the first nip 18 of the calender at a maximum of 5.3%.
  • the drying device 5 must be positioned relatively close to the calender to prevent the moisture from the inside of the web 2 back to the surface compensates before the web 2 passes through the first nip 18 of the calender 6.
  • FIGS. 2 to 4 now show different embodiments of the drying device 5.
  • the drying device 5 is formed by an infrared dryer 26, which is arranged on both sides of the web 2.
  • An infrared dryer operates with an infrared radiation, which acts on the surface of the web 2.
  • the dryer 5 is formed as a contact dryer.
  • the web 2 wraps around two heated rollers 27, 28, so it is also heated in this embodiment of the surface.
  • the drying device 5 is designed as a floating dryer.
  • Two blowing devices 29, 30 blow heated air on both sides of the web 2.
  • the web is held on the one hand in the air, that is guided without contact.
  • moisture is also removed from the web, on the one hand by the supply of heat and on the other hand by the supply of dry air.
  • the drying device 5 acts only on the surface of the web 2, so that areas below the surface of the web 2 remain moister and thus can be compressed more. The deeper you get into the thickness of the web, the lower the moisture content. Accordingly, the Web 2 in the calender 6 total satellites relatively volume-saving.
EP05104603A 2004-07-06 2005-05-30 Procédé et appareil pour le traitement d' une bande de papier ou carton Expired - Fee Related EP1614802B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004032507A DE102004032507A1 (de) 2004-07-06 2004-07-06 Verfahren und Vorrichtung zum Behandeln einer Bahn aus Papier oder Karton

Publications (2)

Publication Number Publication Date
EP1614802A1 true EP1614802A1 (fr) 2006-01-11
EP1614802B1 EP1614802B1 (fr) 2008-02-20

Family

ID=35056936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05104603A Expired - Fee Related EP1614802B1 (fr) 2004-07-06 2005-05-30 Procédé et appareil pour le traitement d' une bande de papier ou carton

Country Status (3)

Country Link
EP (1) EP1614802B1 (fr)
AT (1) ATE386840T1 (fr)
DE (2) DE102004032507A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006134213A2 (fr) * 2005-06-16 2006-12-21 Metso Paper, Inc. Procede et systeme permettant de fabriquer du papier
AT506010B1 (de) * 2007-10-25 2011-12-15 Metso Paper Inc Verfahren und anordnung zur einflussnahme auf die eigenschaften einer faserbahn

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033373A (en) * 1988-05-06 1991-07-23 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Apparatus and process for producing a smooth and glossy surface on a paper web
US5387782A (en) * 1991-04-17 1995-02-07 Sulzer-Escher Wyss Gmbh Apparatus for smoothing paper webs
US6200424B1 (en) * 1996-07-16 2001-03-13 Valmet Corporation Method and arrangement for calendering a board web
US6401355B1 (en) * 1998-07-10 2002-06-11 Metso Paper, Inc. Method and apparatus for manufacturing calendered paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5033373A (en) * 1988-05-06 1991-07-23 Eduard Kusters Maschinenfabrik Gmbh & Co. Kg Apparatus and process for producing a smooth and glossy surface on a paper web
US5387782A (en) * 1991-04-17 1995-02-07 Sulzer-Escher Wyss Gmbh Apparatus for smoothing paper webs
US6200424B1 (en) * 1996-07-16 2001-03-13 Valmet Corporation Method and arrangement for calendering a board web
US6401355B1 (en) * 1998-07-10 2002-06-11 Metso Paper, Inc. Method and apparatus for manufacturing calendered paper

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006134213A2 (fr) * 2005-06-16 2006-12-21 Metso Paper, Inc. Procede et systeme permettant de fabriquer du papier
WO2006134213A3 (fr) * 2005-06-16 2007-02-22 Metso Paper Inc Procede et systeme permettant de fabriquer du papier
AT506010B1 (de) * 2007-10-25 2011-12-15 Metso Paper Inc Verfahren und anordnung zur einflussnahme auf die eigenschaften einer faserbahn

Also Published As

Publication number Publication date
DE102004032507A1 (de) 2006-02-16
EP1614802B1 (fr) 2008-02-20
DE502005002878D1 (de) 2008-04-03
ATE386840T1 (de) 2008-03-15

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