EP1432525B1 - Dispositif d'application - Google Patents

Dispositif d'application Download PDF

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Publication number
EP1432525B1
EP1432525B1 EP02771657A EP02771657A EP1432525B1 EP 1432525 B1 EP1432525 B1 EP 1432525B1 EP 02771657 A EP02771657 A EP 02771657A EP 02771657 A EP02771657 A EP 02771657A EP 1432525 B1 EP1432525 B1 EP 1432525B1
Authority
EP
European Patent Office
Prior art keywords
substrate
application
blowing
air
weakening
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
Application number
EP02771657A
Other languages
German (de)
English (en)
Other versions
EP1432525A2 (fr
Inventor
Richard Bernert
Benjamin Mendez-Gallon
Manfred Ueberschär
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
Priority claimed from DE2001125376 external-priority patent/DE10125376A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1432525A2 publication Critical patent/EP1432525A2/fr
Application granted granted Critical
Publication of EP1432525B1 publication Critical patent/EP1432525B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H23/30—Pretreatment of the paper

Definitions

  • the invention relates to a device for applying liquid or pasty application medium by means of a commissioned work on a running surface, wherein the substrate for direct application, the surface of a material web, in particular of paper or cardboard, and for indirect application, the surface of a transfer element, preferably a transfer roller, is, which then transfers the application medium to the surface of the material web, and wherein in the running direction of the substrate in front of the commissioned work a device for weakening the entrained by the underground air boundary layer is arranged.
  • curtain coater i. an applicator device in which the applicator dispenses the application medium to the substrate as a curtain or veil that moves essentially by gravity.
  • the application medium is delivered to the substrate in the form of a coating medium curtain, which moves substantially by gravity from the commissioned work to the ground.
  • a curtain applicator also known in the art as "curtain coating”
  • the curtain applicator is located at a predetermined distance from the ground, among other things, has the advantage that it is exposed to a lower risk of damage, for example, in a web break.
  • Curtain coats differ from other "contactless" coater sets, such as free-jet jet coaters, where the movement the application medium to the substrate mainly results from the ejection pulse from the delivery nozzle of the commissioned work, fundamentally, since the shape of the discharge from the dispensing nozzle curtain is exposed only to the interplay between the surface tension of the coating medium and gravity.
  • the surface tension tries to contract the curtain, which has a very large surface or circumferential length in relation to its volume or its cross-sectional area, so as to reduce its surface area. This effect is resisted only by gravity, which seeks to stretch the curtain. It is therefore easy to see that it is all the more difficult to obtain a uniformly over the entire working width Ansprgasmedium curtain, the larger this working width.
  • the coating of webs by means of a curtain applicator, which feeds the web to the application medium as a substantially gravitationally moving application medium curtain has long been known from the coating of photographic films, tapes, and the like.
  • the webs in these applications have a significantly smaller width than is the case with modern systems for the production of paper and paperboard webs, in which web widths of more than 10 m are required.
  • Forming a uniformly thick application medium curtain over this width and being able to hold it in a stable manner is a task in which it is far from obvious to expect suggestions for a functional solution from the comparatively easy-to-control known narrow application medium curtains.
  • the webs move in modern paper and paperboard production lines at speeds of up to 3000 m / min, which is many times the speed at which the known narrow webs move, and also a further high load on the Stability of the application medium curtain.
  • the application devices for use in plants for the production and / or finishing of wide and fast-moving material webs, preferably made of paper or cardboard, to further improve, in particular as regards the weakening of the influence of the air boundary layer.
  • Such wear can be prevented according to the invention by the combined use of a blowing device and one of these upstream in the running direction of the material web suction device.
  • the blower has the one hand, the task vorzuschw kauen the entrained on the surface of the current underground air boundary layer. On the other hand, it supports the action of the blowing device, by sucking the air flow emitted by this and thereby stabilized in its movement along the ground.
  • the weakening device according to the invention does not have any weakening elements set against the surface of the material web, ie, these contacting, but is free of such elements. In this sense, the weakening device according to the invention is a purely or exclusively non-contact weakening device.
  • the blowing device used according to the invention may comprise a blow box to which air is supplied in the region of both side edges of the substrate.
  • a substantially uniform over the working width of the ground air flow can be obtained, which moves in the opposite direction carried by the entrained air boundary layer.
  • the outlet nozzle of the blowing device may comprise a slot nozzle or a plurality of individual nozzles.
  • the suction device used according to the invention may comprise a suction box from which air is sucked off only in the region of one of the side edges of the substrate, preferably in the region of the drive-side side edge.
  • the invention proposes that the applicator end facing the blowing device in the direction of the substrate from the impact position of the application medium on the ground a distance of between about 10th mm and about 50 mm.
  • the blowing device has a guide wall which is arranged at a predetermined distance from the running substrate, a blowing channel can be formed through this guide wall in cooperation with the substrate, in which the air ejected from the blowing device flows in the opposite direction to the running direction of the substrate.
  • the efficiency of the action of the ejected from the blowing air flow on the surface entrained air boundary layer can be improved.
  • This effect is particularly effective when the baffle in the direction of the ground has a length of between about 300 mm and about 500 mm. This corresponds to when the blowing device is arranged in the region of a support roller, around which the material web is guided at least partially, depending on the roll diameter a wrap angle of about 90 °.
  • the suction device in the running direction of the ground from the end facing the guide wall or the blowing device has a distance of between about 0 mm and about 50 mm.
  • the blowing device and the suction device can thus both directly adjoin (distance: 0 mm) and have a predetermined distance from one another in the running direction of the ground, so that the suction device does not necessarily have to be able to extract all the air expelled from the blowing device.
  • the attenuation device is preceded by a conditioning device which substantially completely removes the uppermost layers of the air boundary layer.
  • a conditioning device which substantially completely removes the uppermost layers of the air boundary layer.
  • the efficiency of the weakening device depends on various factors, for example the running speed of the ground.
  • the conditioning device ensures that dependency on these influences is minimized, if not completely eliminated.
  • the weakening device does not need to proceed against the entire air boundary layer, but only against the transmitted by the conditioning device part. As a result, the weakening device is relieved and can be designed correspondingly lower power.
  • the conditioning device may comprise a strip extending in the transverse direction of the substrate, which may for example be formed by a simple metal strip.
  • the conditioning device it is also possible for the conditioning device to exploit aerodynamic effects, for example by having a transverse cross-section which has the shape of an inverted airfoil profile.
  • the conditioning device may be self-supporting or attached to the attenuation device.
  • the weakening device according to the invention can be used in particular in an applicator device which has a curtain applicator, i. a commissioned work which emits the application medium as a curtain or veil moving essentially by gravity to the ground.
  • air in the context of the present description, any gas or gas mixture can be understood, which is capable of affecting the entrained air boundary layer in a weakening sense.
  • nitrogen gas could be used instead of air.
  • air as a treatment gas is only preferred because compressed air in almost every machine hall anyway and thus without additional infrastructure and cost is available.
  • a curved course takes.
  • the material web may be guided around a support roller and / or around a support belt and / or around a support shoe.
  • the air boundary layer is subject to centrifugal forces which seek to lift the air boundary layer away from the material web and thus facilitate the action of the weakening device, in particular the blowing device, on the air boundary layer.
  • the radius of curvature of the curved course can be between about 300 mm and about 500 mm.
  • the radius of curvature The smaller the radius of curvature, the greater the centrifugal force generated, but in practice the radius of curvature has a lower limit due to the deflection behavior of the material web. And upwards, the radius of curvature is limited on the one hand by the decrease in centrifugal force and, on the other, by space considerations.
  • an applicator device is generally designated 10. It comprises a curtain applicator 12, from the discharge nozzle 14 application medium 16 is discharged as a coating medium curtain 18 to a moving in the direction L substrate U.
  • the impact position of the application medium curtain 18 on the substrate U is in Fig. 1 denoted by P.
  • the substrate U is formed by the surface 20a of a material web 20 onto which the application medium 16 is applied as a coating layer 22.
  • a weakening device 24 is provided in the running direction L in front of the applicator 12.
  • This weakening device 24 comprises on the one hand a blowing device 26 with a blow box 28 and on the other hand a suction device 30 with a suction box 32.
  • the blow box 28 is located in relation to the running direction L of the substrate U immediately upstream of the applicator 12 and in particular of the application medium curtain 18.
  • the tuyere 28a of the application medium curtain 18 has a distance a, which is preferably between about 10 mm and about 50 mm.
  • the blowing nozzle 28a discharges an air flow 34 directed in the opposite direction to the running direction L, which moves in a blow channel 36 formed by a guide wall 28b of the blow box 28 and the substrate U.
  • This baffle 28b has a length b of between about 300 mm and about 500 mm.
  • This suction box 32 has on the one hand the task of weakening the air boundary layer G by sucking it from the ground U. This is in Fig. 1 indicated by the relative to the substrate U obliquely extending lines.
  • the Suction box 32 but also the task to stabilize the ejected from the blow box 28 air flow 34, in particular to keep the surface of the substrate U by also sucks them from the blower passage 36. This is in Fig. 1 indicated by the contrasting from the underground U small arrows.
  • a conditioning device in the form of a square bar 38 This conditioning strip 38 has the task of lifting the uppermost layers of the air boundary layer G, before the subsurface regions of the air boundary layer are supplied to the suction box 32.
  • the suction device 30 can be provided poorer in performance and thus more cost.
  • the strength of the air boundary layer G after the conditioning strip 38 no longer varies as much as a function of the operating parameters of the application device 10, as is the case without the conditioning strip 38.
  • Fig. 2 is still nachzutragen that the blowing device 26, the blow box 28, the air feeds on both sides. That is, the supply line 28c divides into two branch lines 28d and 28e which open into the suction box 28 with respect to the transverse direction or working width direction Q of the substrate U in its drive-side end face 28f or guide-side end face 28g.
  • the supply line 28c divides into two branch lines 28d and 28e which open into the suction box 28 with respect to the transverse direction or working width direction Q of the substrate U in its drive-side end face 28f or guide-side end face 28g.
  • the air from the suction box 32 of the suction device 30 is only at one.
  • Front side 32a of the suction box 32 sucked, and although preferably on the drive-side end face of the suction box 32, as in Fig. 3 is shown.
  • Fig. 1 is still nachzutragen that the web 20 is guided around a support roller 40 in the region of the blowing device 26.
  • the air boundary layer G is subjected to a centrifugal force which seeks to detach it from the material web 20, which facilitates the action of the blowing device 26 on the air boundary layer G.
  • the web 20 of the support roller 40 is fed from below, so as not to disturb the application medium curtain 18 in its flow behavior.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Advancing Webs (AREA)
  • Eye Examination Apparatus (AREA)
  • Massaging Devices (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Claims (15)

  1. Dispositif (10) pour l'application de milieu d'enduction liquide ou pâteux (16) au moyen d'un dispositif d'enduction (12) sur un subjectile en mouvement (U),
    le subjectile (U), en cas d'application directe, étant la surface (20a) d'une bande de matériau (20), notamment de papier ou de carton, et en cas d'application indirecte, étant la surface d'un élément de transfert, de préférence un rouleau de transfert, qui transfère alors le milieu d'enduction à la surface de la bande de matériau, et
    un dispositif (24) pour l'affaiblissement de la couche limite d'air (G) entraînée par le subjectile (U) étant disposé dans la direction d'avance (L) du subjectile (U) avant le dispositif d'enduction (12),
    le dispositif d'affaiblissement (24) comprenant un dispositif de soufflage (26) et un dispositif d'aspiration (30),
    le dispositif de soufflage (26) étant disposé dans la direction d'avance (L) du subjectile (U) avant le dispositif d'enduction (12) et éjectant un jet d'air (34) orienté dans le sens opposé à la direction d'avance (L),
    le dispositif d'aspiration (30) étant disposé dans la direction d'avance (L) du subjectile (U) avant le dispositif de soufflage (26) et aspirant au moins une partie du jet d'air (34) produit par le dispositif de soufflage (26) ainsi qu'au moins une partie de la couche limite d'air (G) entraînée par le subjectile (U), et
    le dispositif de soufflage (26) présentant une paroi directrice (28b) qui est disposée à une distance prédéterminée (3b) du subjectile en mouvement (U) et qui est prévue pour former un canal de soufflage (36) entre la paroi directrice (28b) et le subjectile (U), dans lequel se déplace le jet d'air (34) éjecté par le dispositif de soufflage (26).
  2. Dispositif d'application selon la revendication 1,
    caractérisé en ce que le dispositif (10) applique un milieu d'enduction liquide ou pâteux (16) au moyen d'un dispositif d'application en rideau (12) sur le subjectile en mouvement (U).
  3. Dispositif d'application selon la revendication 1 ou 2,
    caractérisé en ce que le dispositif de soufflage (26) comprend une caisse soufflante (28) qui est alimentée en air dans la région des deux bords latéraux du subjectile (U).
  4. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le dispositif d'aspiration (30) comprend une caisse aspirante (32), de laquelle de l'air est aspiré seulement dans la région de l'un des bords latéraux du subjectile (U), de préférence dans la région du bord latéral côté entraînement.
  5. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que l'extrémité du dispositif de soufflage (26) tournée vers le dispositif d'enduction (12) présente, dans la direction d'avance (L) du subjectile (U), depuis la position de contact (P) du milieu d'enduction (16) sur le subjectile (U), une distance (a) comprise entre environ 10 mm et environ 50 mm.
  6. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la paroi directrice (28b) présente, dans la direction d'avance (L) du subjectile (U), une longueur (b) comprise entre environ 300 mm et environ 500 mm.
  7. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le dispositif d'aspiration (30) présente, dans la direction d'avance (L) du subjectile (U), depuis l'extrémité de la paroi directrice (28b) ou du dispositif de soufflage (26) tournée vers lui, une distance (c) comprise entre environ 0 mm et environ 50 mm.
  8. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la buse de sortie (28a) du dispositif de soufflage (26) comprend une buse à fente ou une pluralité de buses individuelles.
  9. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le dispositif d'affaiblissement (24) est placé après un dispositif de conditionnement (38), qui élimine essentiellement totalement les couches supérieures de la couche limite d'air (G).
  10. Dispositif d'application selon la revendication 9,
    caractérisé en ce que le dispositif de conditionnement (38) comprend une nervure s'étendant dans la direction transversale (Q) du subjectile (U).
  11. Dispositif d'application selon la revendication 9 ou 10,
    caractérisé en ce que le dispositif de conditionnement (38) est disposé à une distance du subjectile (U) comprise entre environ 3 mm et environ 10 mm.
  12. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le subjectile (U) adopte dans la région du dispositif d'affaiblissement (24), de préférence dans la région ou immédiatement avant la sortie d'air (28a) du dispositif de soufflage (26), une allure courbée.
  13. Dispositif d'application selon la revendication 12,
    caractérisé en ce que la bande de matériau (20) est guidée autour d'un rouleau de support (40) et/ou autour d'une bande de support et/ou autour d'un sabot de support.
  14. Dispositif d'application selon la revendication 12 ou 13,
    caractérisé en ce que le rayon de courbure (R) de l'allure courbée est compris entre environ 300 mm et environ 500 mm.
  15. Dispositif d'application selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le subjectile (U) est acheminé par le bas depuis la position de contact (P) du milieu d'enduction (16) sur le subjectile (U).
EP02771657A 2001-05-23 2002-05-22 Dispositif d'application Expired - Lifetime EP1432525B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10125376 2001-05-23
DE2001125376 DE10125376A1 (de) 2000-03-14 2001-05-23 Auftragsvorrichtung
PCT/EP2002/005621 WO2002094452A2 (fr) 2001-05-23 2002-05-22 Dispositif d'application

Publications (2)

Publication Number Publication Date
EP1432525A2 EP1432525A2 (fr) 2004-06-30
EP1432525B1 true EP1432525B1 (fr) 2010-04-07

Family

ID=7686014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02771657A Expired - Lifetime EP1432525B1 (fr) 2001-05-23 2002-05-22 Dispositif d'application

Country Status (6)

Country Link
US (2) US7037375B2 (fr)
EP (1) EP1432525B1 (fr)
JP (1) JP4020198B2 (fr)
AT (1) ATE463620T1 (fr)
DE (1) DE50214344D1 (fr)
WO (1) WO2002094452A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004056271A1 (de) * 2004-11-22 2006-05-24 Basf Ag Anordnung und Verfahren zur Vorhangbeschichtung bewegter Substrate
DE102010001616A1 (de) 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Auftragsvorrichtung
FI20105915A0 (fi) * 2010-08-31 2010-08-31 Metso Paper Inc Menetelmä ja laitteisto kuiturainan käsittelemiseksi
DE102011079568A1 (de) 2011-07-21 2013-01-24 Voith Patent Gmbh Verfahren und Vorrichtung zur Vorhangbeschichtung
DE102017101373B4 (de) * 2017-01-25 2022-02-03 Voith Patent Gmbh Vorhang-Auftragswerk und Verfahren zum Auftragen eines Auftragsmediums

Family Cites Families (19)

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DE3424884C1 (de) * 1984-07-06 1986-02-20 Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf Vorrichtung zum Auftragen mindestens einer Giessschicht und Verfahren zum Betrieb dieser Vorrichtung
DE3706542A1 (de) * 1987-02-28 1988-09-08 Voith Gmbh J M Luftleitkasten fuer die trockenpartie einer schnellaufenden papiermaschine
US4821429A (en) * 1987-11-30 1989-04-18 J. M. Voith, Gmbh Air guide box for stabilizing the run of a web, for instance a paper web
FI108061B (fi) * 1995-10-05 2001-11-15 Metso Paper Inc Menetelmä liikkuvan paperi- tai kartonkirainan päällystämiseksi
DE19716647A1 (de) 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
DE19800954A1 (de) * 1998-01-13 1999-07-15 Voith Sulzer Papiertech Patent Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton
DE19803240A1 (de) 1998-01-28 1999-07-29 Voith Sulzer Papiertech Patent Farbvorhang-Auftragsvorrichtung
DE19903559B4 (de) 1998-01-30 2004-02-26 Mitsubishi Paper Mills Limited Verfahren und Apparatur zur Vorhangbeschichtung
DE19827030A1 (de) * 1998-06-17 1999-12-23 Voith Sulzer Papiertech Patent Auftragsvorrichtung
DE19829449A1 (de) 1998-07-01 2000-01-05 Voith Sulzer Papiertech Patent Auftragsvorrichtung und Auftragsverfahren
JP4113985B2 (ja) 1998-07-22 2008-07-09 富士フイルム株式会社 塗布方法及び装置
JP3625254B2 (ja) * 1998-12-11 2005-03-02 三菱製紙株式会社 塗布装置
FI115295B (fi) 1999-09-01 2005-04-15 Metso Paper Inc Verhopäällystin ja verhopäällystysmenetelmä
DE10012347A1 (de) 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Vorhang- Auftragsvorrichtung
DE10012257A1 (de) 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Auftragsvorrichtung
JP3676182B2 (ja) * 2000-04-03 2005-07-27 三菱重工業株式会社 塗工装置および塗工方法
JP4403632B2 (ja) * 2000-04-27 2010-01-27 株式会社Ｉｈｉ カーテンコータのエアーカット装置
DE10057734A1 (de) 2000-11-22 2002-05-23 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung
FI115314B (fi) * 2001-03-13 2005-04-15 Metso Paper Inc Sovitelma paperin tai kartongin käsittelemiseksi

Also Published As

Publication number Publication date
ATE463620T1 (de) 2010-04-15
EP1432525A2 (fr) 2004-06-30
DE50214344D1 (de) 2010-05-20
JP4020198B2 (ja) 2007-12-12
WO2002094452A3 (fr) 2004-03-11
US7037375B2 (en) 2006-05-02
US20060065190A1 (en) 2006-03-30
WO2002094452A2 (fr) 2002-11-28
US20040107899A1 (en) 2004-06-10
US7326301B2 (en) 2008-02-05
JP2004531387A (ja) 2004-10-14

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