EP1571257B1 - Procédé et dispositif pour le traitement d'une bande de papier ou carton - Google Patents

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

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Publication number
EP1571257B1
EP1571257B1 EP05100472A EP05100472A EP1571257B1 EP 1571257 B1 EP1571257 B1 EP 1571257B1 EP 05100472 A EP05100472 A EP 05100472A EP 05100472 A EP05100472 A EP 05100472A EP 1571257 B1 EP1571257 B1 EP 1571257B1
Authority
EP
European Patent Office
Prior art keywords
web
nip
range
calender
extended nip
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.)
Revoked
Application number
EP05100472A
Other languages
German (de)
English (en)
Other versions
EP1571257A1 (fr
Inventor
Rüdiger Dr. Kurtz
Jörg Dr. Rheims
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34745414&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1571257(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1571257A1 publication Critical patent/EP1571257A1/fr
Application granted granted Critical
Publication of EP1571257B1 publication Critical patent/EP1571257B1/fr
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

  • the invention relates to a method for treating a web of paper or cardboard, wherein a stroke is applied to the web and the web then satin. Furthermore, the invention relates to an apparatus for treating a web of paper or cardboard with a coater and a calender.
  • Paper and board webs are often painted, so provided with a coating.
  • the stroke also referred to as "paint" is used to provide the web with an improved surface finish.
  • the luster and / or smoothness of the painted i.e. to improve the coated surface of the web.
  • the surface of the web is often still relatively rough.
  • the web must therefore be calendered in order to achieve certain smoothness values and to fix the line on the web.
  • relatively high compressive stresses and often relatively high temperatures are required. This makes the calendering relatively expensive.
  • the invention has for its object to be able to satinize a coated web at high smoothness and volume-saving.
  • This object is achieved in a method of the type mentioned above by steaming the web before satining and satined in a nip.
  • a nip unlike a nip formed between two rolls, allows steam to enter so that a kind of "protective film” can build up between the nip and the roll against which the coated side abuts , This protective film then prevents the line from sticking to the roller. At the same time, due to the high temperature, the steam can not condense on the web, but no additional moistening of the coating layer occurs.
  • the satin finish is done online with the application of the stroke.
  • a line application device, a steam application device and the wide-nip calender are arranged along the web path. This initially saves handling, which is associated with winding the web between the coating application and the satinizing.
  • a nip is used having a length in the range of 30 to 400 mm, in particular in the range of 40 to 100 mm for coated graphic paper grades and 100 to 200 mm for coated paperboard grades. With such a nip length, it can be ensured with great reliability that the line does not catch on a roller.
  • the web is preferably satin-finished in a shoe calender which has a shoe roll having a circumferential jacket and a counter roll, the counter roll being operated at a surface temperature in the range from 130 to 300 ° C., in particular in the range from 170 to 250 ° C.
  • the counter roll thus has a temperature above the steam temperature of water at least in the inlet and outlet areas. This ensures that the moisture contained in the bar, or the moisture that has been additionally applied by the steam, can evaporate in the nip.
  • the compressive stresses in the nip are on the one hand so large that the steam can not tear the surface of the applied line, but on the other hand, however, a protective layer may occur, which prevents adhesion of the line to the counter roll.
  • the maximum compressive stress in the extended nip is set below 20 MPa. Due to the vapor deposition, even with this relatively low compressive stress, sufficient gloss and smoothness values are achieved. On the other hand, this low compressive stress prevents the coating from adhering to the backing roll.
  • a residence time of the web in the nip in the range of 0.8 to 50 ms. This residence time is sufficient to smooth the coated surface of the web sufficiently. For cardboard, the residence time will tend to be greater, but rather less for graphic papers.
  • the web is steamed for 10 to 100 ms before entering the nip.
  • the steam then has enough time to react with the applied stroke, so prepare it so far that the desired smoothness can be generated in the nip.
  • a pressure gradient of at most 2 MPa / mm is generated in the inlet and outlet areas of the broad nip.
  • the length of the inlet and outlet areas is usually in the order of about 10 mm.
  • the compressive stress in the nip increases at most by 2 MPa per mm. This has the consequence that the vapor which adheres to the web or has already condensed there, can penetrate into the nip.
  • the wide nip thus forms no vapor barrier, as this is due to a relatively large pressure gradient for two opposite rolls is the case.
  • the object is achieved in a device of the type mentioned above in that between the coater and the calender, a Dampfsmokeds shark is arranged and the calender is designed as a broad-nip calender.
  • the interaction of the steam application device with the wide-nip calender causes the coated surface of the web to obtain sufficient smoothness and optionally also a sufficient gloss.
  • the length of the broad nip is in the range of 30 to 400 mm, in particular in the range of 40 to 100 mm for coated graphic paper grades and 100 to 200 mm for coated board grades. Such a length is sufficient to sufficiently satin the web, even if only relatively low compressive stresses are used.
  • the wide-nip calender has a shoe roll with a circumferential jacket and a counter-roll cooperating therewith.
  • the coat of the shoe roll is supported by a pressure shoe.
  • the jacket runs around in the manner of a roller and is thereby concavely deformed in the region of the counter-roller and the pressure shoe from its otherwise convex shape.
  • the counter roll has a temperature in the range of 130 to 300 ° C, in particular in the range of 170 to 250 ° C.
  • the surface temperature of the counter roll is thus relatively high. Moisture contained in the coating order is thus heated accordingly high, so that they may possibly form a protective film, which prevents adhesion of the line to the counter roll. Possibly, the adhesion of the coating to the counter roll is also prevented by the fact that the coating can dry out due to the prevailing relatively high temperatures and is no longer prone to sticking.
  • the maximum compressive stress in the extended nip is 20 MPa. Although this is a relatively low compressive stress. But it is sufficient to smooth the coated side of the web. It may also allow vapor, which has not yet completely condensed on the web after application, to enter the nip, to not condense there, and to form a blocking layer against sticking.
  • the compressive stress in the inlet and outlet areas of the broad nip increases with a gradient of at most 2 MPa / mm.
  • the limitation of the increase the compressive stress is advantageous for the entry of the steam into the nip.
  • the steam application device is arranged in the range of 0.3 to 1.5 m before entering the broad nip.
  • the speed of the web which can range from about 250 m / min (400 g / m 2 board) to about 2,500 m / min (graphic papers, eg LWC 50 g / m 2 )
  • the steam will have until then Although a certain moistening of the coated surface of the web causes.
  • a device 1 shown in the figure is used to treat a web 2 of paper or cardboard.
  • the web 2 comes from a paper or board machine 3, which is shown only schematically. It is also possible to unwind the web 2 from a supply roll, for example a jumbo roll.
  • the web 2 first passes through a coating device 4 in which a line 5 is applied to a surface of the web 2. In the illustrated embodiment this is the top.
  • the dash 5 is shown exaggerated here.
  • the coater 4 is designed as a "curtain coater", i. it has a bar delivery device 6, which applies a coating medium, that is to say a coating color or line pigments, in the form of a curtain 7 onto the surface of the web 2.
  • a coating medium that is to say a coating color or line pigments
  • the thickness of the bar 5 can be set relatively accurately.
  • the thickness of the bar 5 is shown oversized for reasons of clarity.
  • Coating color, which is not absorbed by the web 2, for example, because the curtain 7 is too wide, is collected in a drip pan 8 and returned to the bar dispenser 6 again.
  • drying devices are arranged behind the bar delivery device 6, which dry the applied line. These can work with infrared, hot air, drying cylinders or other means.
  • a steam application device 10 is arranged, the steam 11 is applied to the provided with the stroke 5 side of the web 2.
  • a wide-nip calender 12 is arranged, which is also referred to as "shoe calender”.
  • the wide-nip calender 12 has a shoe roll 13 with a circumferential jacket 14.
  • the jacket 14 acts with a counter-roller 15 and forms a broad nip 16, in which the web 2 is calendered, that is acted upon with a certain pressure and at an elevated temperature.
  • the counter roll 15 has a plurality of peripheral bores 17, through which a heat transfer medium, such as oil or steam, can be guided to the surface of the counter roll 15 with a surface temperature in the range of 130 to 300 ° C, preferably in the range of 170 to 250 ° C, to be provided.
  • a heat transfer medium such as oil or steam
  • the peripheral bores 17 can be used instead of the peripheral bores 17 to heat the surface of the counter-roller 15, for example an induction heater or an infrared heater.
  • the shoe roll 13 has a pressure shoe 18, which is arranged stationary. To close the wide nip 16, the counter-roller 15 is lowered in the direction of a double arrow 19, wherein the jacket 14 is supported by a pressure surface 20 of the pressure shoe 18.
  • the pressure surface 20 has a shape in the present embodiment, which is adapted taking into account the thickness of the jacket 14 to the curvature of the counter-roller 15. But this is not absolutely necessary.
  • the extended nip 16 has a length in the web running direction 9 in the range of 30 to 400 mm, in particular in the range of 40 to 100 mm for coated graphic paper grades and 100 to 200 mm for coated board grades.
  • a speed of the web 2 in the range of 400 to The web thus requires about 0.8 to 50 ms at 2,500 m / min in order to pass through the wide nip 16.
  • a compressive stress in the extended nip 16 which is a maximum of 20 MPa.
  • This compressive stress acts, for example, approximately in the middle of the broad nip in the web running direction 9. From the entry into the broad nip, the compressive stress increases, namely a maximum of 2 MPa per mm. In other words, the gradient of the compressive stress is limited.
  • the line 5 does not catch on the counter-roller 15. It is believed that due to the relatively short residence time between application of the vapor 11 and entry of the web 2 into the nip 16, the vapor 11 does not completely or even slightly condense before the nip and some of the vapor also enters the nip can. There he can not due to the elevated temperature of the counter roll 15 continue to condense, but forms a blocking layer against sticking. In addition, the bar 5 is dried due to the prevailing very high temperatures in the nip and then no longer tends to stick.
  • a second coater followed by a second die in the direction behind the illustrated extended nip 16
  • the coating device then acts on the other side of the web and the hard roll of the subsequent broad nip with this other side of the web Train is in contact.
  • the web is cooled so that the first line solidifies and the web is ready for steaming again.

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  • Paper (AREA)

Claims (15)

  1. Procédé de traitement d'une bande de papier ou de carton, dans lequel on applique une couche sur la bande et l'on satine ensuite la bande, caractérisé en ce que l'on vaporise la bande avant le satinage et qu'on la satine dans un pinçage prolongé.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on effectue le satinage en ligne avec l'application de la couche.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'on utilise un pinçage prolongé ayant une longueur de l'ordre de 30 à 400 mm, notamment de l'ordre de 40 à 100 mm pour des types de papier graphiques enduits, et de 100 à 200 mm pour des types de carton enduits.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on satine la bande dans une calandre à sabot, qui présente un rouleau à sabot présentant une enveloppe périphérique et un rouleau conjugué, le rouleau conjugué étant amené à une température de surface de l'ordre de 130 à 300°C, notamment de l'ordre de 170 à 250°C.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on ajuste la tension de pression maximale dans le pinçage prolongé en dessous de 20 MPa.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on ajuste un temps de résidence de la bande dans le pinçage dans une plage de 0,8 à 50 ms.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que l'on vaporise la bande 10 ms à 100 ms avant son entrée dans le pinçage prolongé.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on produit un gradient de pression de 2 MPa/mm au maximum dans les zones d'entrée et de sortie du pinçage prolongé.
  9. Dispositif de traitement d'une bande de papier ou de carton comprenant un dispositif d'enduction et une calandre, caractérisé en ce que l'on dispose entre le dispositif d'enduction (4) et la calandre un dispositif d'application de vapeur (10) et en ce que la calandre est réalisée sous forme de calandre à pinçage prolongé (12).
  10. Dispositif selon la revendication 9, caractérisé en ce que la longueur du pinçage prolongé (16) est de l'ordre de 30 à 400 mm, notamment de l'ordre de 40 à 100 mm pour des types de papier graphiques enduits et de 100 à 200 mm pour des types de carton enduits.
  11. Dispositif selon la revendication 9 ou 10, caractérisé en ce que la calandre à pinçage prolongé (12) présente un rouleau à sabot (13) avec une enveloppe périphérique (14) et un rouleau conjugué (15) coopérant avec lui.
  12. Dispositif selon la revendication 11, caractérisé en ce que le rouleau conjugué (15) présente une température de surface de l'ordre de 130 à 300°C, notamment de l'ordre de 170 à 250°C.
  13. Dispositif selon l'une quelconque des revendications 9 à 12, caractérisé en ce que la tension de pression maximale dans le pinçage prolongé (16) vaut 20 MPa.
  14. Dispositif selon la revendication 13, caractérisé en ce que la tension de pression augmente avec un gradient de 2 MPa/mm au maximum dans les régions d'entrée et de sortie du pinçage prolongé (16).
  15. Dispositif selon l'une quelconque des revendications 9 à 14, caractérisé en ce que le dispositif d'application de vapeur (10) est disposé de 0,3 à 1,5 m avant l'entrée dans le pinçage prolongé (16).
EP05100472A 2004-03-06 2005-01-26 Procédé et dispositif pour le traitement d'une bande de papier ou carton Revoked EP1571257B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004010894 2004-03-06
DE102004010894A DE102004010894A1 (de) 2004-03-06 2004-03-06 Verfahren und Vorrichtung zum Behandeln einer Bahn aus Papier oder Karton

Publications (2)

Publication Number Publication Date
EP1571257A1 EP1571257A1 (fr) 2005-09-07
EP1571257B1 true EP1571257B1 (fr) 2008-02-20

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Family Applications (1)

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EP05100472A Revoked EP1571257B1 (fr) 2004-03-06 2005-01-26 Procédé et dispositif pour le traitement d'une bande de papier ou carton

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US (1) US7691232B2 (fr)
EP (1) EP1571257B1 (fr)
DE (2) DE102004010894A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
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DE102004062618A1 (de) * 2004-12-24 2006-07-06 Voith Paper Patent Gmbh Glättanordnung
DE102006001021A1 (de) * 2006-01-07 2007-07-12 Voith Patent Gmbh Mattsatinage
WO2008103154A1 (fr) * 2007-02-22 2008-08-28 Meadwestvaco Corporation Procédé pour le traitement d'un substrat
US20080230001A1 (en) 2006-02-23 2008-09-25 Meadwestvaco Corporation Method for treating a substrate
WO2009025739A1 (fr) * 2007-08-17 2009-02-26 Meadwestvaco Corporation Procédé pour traiter un substrat
DE102022112687A1 (de) 2022-05-20 2023-11-23 Voith Patent Gmbh Verfahren und Maschine zur Erhöhung der Querdehnung einer Testliner-Papierbahn in Hochgeschwindigkeits-Papiermaschinen

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Also Published As

Publication number Publication date
US20050194112A1 (en) 2005-09-08
DE102004010894A1 (de) 2005-09-22
EP1571257A1 (fr) 2005-09-07
US7691232B2 (en) 2010-04-06
DE502005002871D1 (de) 2008-04-03

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