EP1749585A2 - Methode d'application d'un revêtement - Google Patents

Methode d'application d'un revêtement Download PDF

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Publication number
EP1749585A2
EP1749585A2 EP06114820A EP06114820A EP1749585A2 EP 1749585 A2 EP1749585 A2 EP 1749585A2 EP 06114820 A EP06114820 A EP 06114820A EP 06114820 A EP06114820 A EP 06114820A EP 1749585 A2 EP1749585 A2 EP 1749585A2
Authority
EP
European Patent Office
Prior art keywords
curtain
web
fluid
fibrous web
edges
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.)
Withdrawn
Application number
EP06114820A
Other languages
German (de)
English (en)
Other versions
EP1749585A3 (fr
Inventor
Benjamin Méndez-Gallon
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 EP1749585A2 publication Critical patent/EP1749585A2/fr
Publication of EP1749585A3 publication Critical patent/EP1749585A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters

Definitions

  • the invention relates to a method and a curtain applicator for applying liquid to pasty, especially with special thickeners enriched application media on a running in the running direction paper, cardboard or other fibrous web in their production and / or finishing.
  • the curtain applicator unit transmits a substantially web-wide and gravitationally free-falling coating medium curtain directly to the moving fibrous web.
  • the curtain then hits in an impingement line either on a free web or on a, the fibrous web supported by a support member area.
  • Machines for producing and / or refining a fibrous web, in particular a paper or board web already have widths of more than 10 m today.
  • a curtain applicator (Curtain Coater) is a, over the entire web width reaching uniform order can be ensured, including a very uniform and often a wider than the given web width reaching curtain is necessary.
  • a generic curtain applicator or order process is from the DE-10047167-A1 known.
  • the object of the invention is to provide an improved curtain application method and an improved curtain applicator, with which the disadvantages of the prior art can be avoided.
  • the object of the invention is achieved by a curtain application method according to claim 1 and a curtain applicator according to claim 5.
  • the inventor has recognized that by moistening the end-side fibrous web edges with a fluid, it is possible to change the wetting ability of the fibrous web (or else of another substrate to be coated) such that the subsequent application medium does not adhere to the web edges and thus so-called Farbmenisken and the associated adverse effects can be avoided.
  • the front edges of the fibrous web are wetted with a fluid before theWhenmediums- curtain reaches the fibrous web.
  • the fluid used is preferably water. But other liquids are conceivable. However, it is important that the surface tension of the edge fluid used is or is chosen such that the surface tension of the edge fluid is higher than the surface tension of the application medium to be applied over the entire web width.
  • water has a surface tension of about 70 mN / m and that of the application medium is only about 40-50 mN / m.
  • the invention also relates to a curtain applicator according to claim 5, wherein according to the invention in addition to the curtain dispensing unit at least one fluid dispenser is provided.
  • the latter unit wets the front edges of the fibrous web with the fluid and, as a preferred solution, can be seen in the direction of the fibrous web, just before the impact line of the application medium curtain. It is expedient if the fluid delivery device acts wetting from above on the front side fibrous web edges. As a result, essentially only the edges and not further areas, such as the web surface to be coated thereafter, are moistened.
  • a local dilution of the subsequently applied application medium is achieved and at the same time the adhesion of the application medium (for example coating color) to these moistened edges is avoided, or at least reduced.
  • the fluid delivery device not acts vertically from above on the web edges, but the corresponding nozzles are arranged downstream of the intended curtain and against the web running direction obliquely at an angle of less than 65 ° are employed. This inclination at the same angle can also be present additionally in the transverse direction.
  • the jet emitted from the nozzles of the fluid dispenser then penetrates the coating color curtain at the web edge and impinges there, even before the curtain arrives there.
  • a further advantageous possibility of the arrangement of the fluid dispenser can be that it is present in a simple manner to a directly before the curtain impact point or impingement already existing air boundary layer control or removal device (which is usually present to the forming curtain protected against negative air influences that occur the faster the web runs).
  • a fibrous web 1 of width B running in the direction of travel L is shown, onto which a wider application medium curtain 2 of a curtain applicator 3, not shown here above the web 1, is dispensed for the purpose of web-width coating becomes.
  • the curtain coater 3 is also distributed by the company of the applicant under the name "Curtain Coater” or "DF Coater”.
  • the end-side web edges 1.1 and 1.2 are moistened with a fluid dispenser 4.
  • a fluid jet reaches 4.1 or 4.2 (in the example is selected as fluid water) just so each at an end-side web edge 1.1 or 1.2, whereby this now wetted with fluid edge at subsequent coating with application medium (coating color) there "uncoated” remains , It will be generated by application medium free web edges 1.3 and 1.4. The formation of an undesirable meniscus 5 or a kind of liquid bridge at this web edge is therefore avoided.
  • deflecting scrapers 6 are shown in FIG . These are employed at an angle of about 65 ° against the bottom 1 b of the fibrous web 1 and scrape there at the edge attachments of application medium and the meniscus 5 and simultaneously divert Abspritzept of the meniscus 5 down where they share with the projecting curtain side edges 2a and 2b can be collected in a drip pan 7 and then recycled again.
  • only the one fluid nozzle 4b is shown here.
  • FIG. 3 shows, in contrast to FIGS. 1 and 2, that the nozzles 4a and 4b can also be inclined relative to the fibrous web 1, namely at an angle ⁇ of up to 65 °.
  • the fluid jets 4.1 and 4.2 cut through the curtain 2 in the edge region of the web 1 against the web direction L and thereby wet the web ends at a point X, before the curtain 2 reaches the web surface 1a at the impact line P. (see FIG. 4 ).
  • the points X and the impingement line P of the curtain 2 are also shown in FIGS. 1 and 2. With the wetting or moistening, in addition to the edge cleaning, a particularly clean separation of the curtain side edges 2a and 2b from the remaining curtain 2 is achieved.
  • FIG. 5 shows that the cutting can also take place approximately at the impingement line P of the curtain 2.
  • the lines X and P coincide here approximately.
  • the fluid dispensers 4 are located downstream of the intended curtain 2 and against the web running direction at the above indicated angle ⁇ .
  • Figure 7 shows a schematic representation of an application of the inventive device of Figure 1, although the application of the other variants shown and described with a slightly different construction would also be possible in this context.
  • the fluid delivery device 4 is arranged upstream of the applicator 3, ie immediately before the curtain 2 or its impingement line P.
  • This fluid delivery device 4 is in this example on or on an existing air boundary layer removal device 8, which is here designed in the form of a scraper strip located close to the web surface. Therefore, this arrangement is easy to retrofit in existing machines.
  • a passage 9 is incorporated for the discharged from the dispenser 4 to the web edges 1.1 and 1.2 fluid (preferably water).
  • nozzles or discharge openings 4a and 4b (see also FIG. 1) of the delivery device 4 for the fluid jets 4.1 and 4.2 can also be arranged in a wide and / or height-adjustable manner.
  • the fluid jets can be adapted to the respective given size ratios of the coating machine or the web width B.
  • a collecting trough 10 for the fluid and the collecting trough 7 already shown in FIG. 2 for the curtain parts 2 a and 2 b located outside the web width B are likewise shown in FIG .
  • Both drip pans 7 and 10 can be connected to each other, so that only a common storage is necessary, whereby the apparatus design is easier. Likewise, their adjustment is given, but not shown.
  • the running in the direction L fibrous web 1 via a support and guide roller 11 to curtain applicator unit 3 runs.
  • the fibrous web 1 is fed by deflecting element 12 (eg an airturn) in the direction of the arrow to further processing steps, not shown here, eg drying, re-coating, smoothing etc.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
EP06114820A 2005-08-04 2006-06-01 Methode d'application d'un revêtement Withdrawn EP1749585A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510036667 DE102005036667A1 (de) 2005-08-04 2005-08-04 Auftragsverfahren

Publications (2)

Publication Number Publication Date
EP1749585A2 true EP1749585A2 (fr) 2007-02-07
EP1749585A3 EP1749585A3 (fr) 2009-07-22

Family

ID=36678626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06114820A Withdrawn EP1749585A3 (fr) 2005-08-04 2006-06-01 Methode d'application d'un revêtement

Country Status (2)

Country Link
EP (1) EP1749585A3 (fr)
DE (1) DE102005036667A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144230A1 (fr) * 2006-06-12 2007-12-21 Voith Patent Gmbh Dispositif d'enduction d'une bande en mouvement de papier, carton ou autre matière fibreuse
WO2012041673A1 (fr) * 2010-09-30 2012-04-05 Voith Patent Gmbh Dispositif d'application directe ou indirecte d'une substance à appliquer liquide à pâteuse et procédé de fonctionnement d'un tel dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011076713A1 (de) * 2011-05-30 2012-12-06 Voith Patent Gmbh Verfahren zur Herstellung einer holzfreien gestrichenen oder leichtgewichtig gestrichenen Papierbahn
DE102014013996A1 (de) * 2014-09-25 2016-03-31 Andritz Küsters Gmbh Verfahren und Vorrichtung zur Vorhangbeschichtung

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10047167A1 (de) 2000-09-22 2002-04-11 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI93242C (fi) * 1993-03-25 1995-03-10 Valmet Paper Machinery Inc Menetelmä ja laitteisto päällystysleveyden rajoittamiseksi ja/tai telapäätyjen vaurioitumisen estämiseksi paperin tai vastaavan rainamateriaalin päällystyksessä tai pintaliimauksessa
DE19960772A1 (de) * 1999-12-16 2001-06-21 Voith Paper Patent Gmbh Auftragsverfahren
EP1319747A2 (fr) * 2001-12-13 2003-06-18 Dow Global Technologies Inc. Procédé et dispositif de revêtement au rideau
JP2005161153A (ja) * 2003-12-01 2005-06-23 Voith Paper Patent Gmbh ダブル塗工装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10047167A1 (de) 2000-09-22 2002-04-11 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144230A1 (fr) * 2006-06-12 2007-12-21 Voith Patent Gmbh Dispositif d'enduction d'une bande en mouvement de papier, carton ou autre matière fibreuse
WO2012041673A1 (fr) * 2010-09-30 2012-04-05 Voith Patent Gmbh Dispositif d'application directe ou indirecte d'une substance à appliquer liquide à pâteuse et procédé de fonctionnement d'un tel dispositif

Also Published As

Publication number Publication date
DE102005036667A1 (de) 2007-02-08
EP1749585A3 (fr) 2009-07-22

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