EP1403428A1 - Dispositif d'enduction pour déposer un materiau fluide ou pâteux sur une bande en mouvement - Google Patents

Dispositif d'enduction pour déposer un materiau fluide ou pâteux sur une bande en mouvement Download PDF

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Publication number
EP1403428A1
EP1403428A1 EP03103477A EP03103477A EP1403428A1 EP 1403428 A1 EP1403428 A1 EP 1403428A1 EP 03103477 A EP03103477 A EP 03103477A EP 03103477 A EP03103477 A EP 03103477A EP 1403428 A1 EP1403428 A1 EP 1403428A1
Authority
EP
European Patent Office
Prior art keywords
application
application unit
work according
fibrous web
web
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Withdrawn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
EP03103477A
Other languages
German (de)
English (en)
Inventor
Benjamin Dr. Méndez-Gallon
Michael Dr. Trefz
Martin Dr. Kustermann
Franz Fischer
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.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1403428A1 publication Critical patent/EP1403428A1/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Withdrawn legal-status Critical Current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
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0283—Flat jet coaters, i.e. apparatus in which the liquid or other fluent material is projected from the outlet as a cohesive flat jet in direction of the work
    • 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
    • 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
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/34—Knife or blade type coaters
    • D21H23/36—Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade or short-dwell 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
    • D21H23/50—Spraying or projecting

Definitions

  • the invention relates to a commissioned work according to the preamble of claim 1.
  • Generic application units are known from machines for producing and / or refining a paper or cardboard web. They are used in the context of so-called coating systems, with which the running web is to be provided on one or both sides with one or more layers of a liquid or pasty application medium.
  • the application media are, for example, coating color (with pigments dispersed in liquid), starch or impregnating liquid.
  • the web wraps around a surrounding counter surface in the area of the application unit.
  • the counter surface can be a circulating belt or a counter or support roller.
  • the application unit applies the liquid or pasty medium directly to the surface of the running web.
  • the air scraper edge can also damage the web or is itself subject to wear.
  • the object of the invention is therefore to develop a device with which the influence of the air boundary layer can be weakened better than before.
  • a counterflow device is arranged directly in front of the application unit.
  • the counterflow device has guide surfaces which form a nozzle channel between them, the outlet opening of which is directed towards the air boundary layer carried along with the web.
  • the counterflow device works with a pressurized fluid, such as steam or compressed air, so that a fluid flow can be generated which counteracts the air boundary layer, deflects it or breaks it down.
  • a pressurized fluid such as steam or compressed air
  • the use of steam is preferred, since steam condenses on cooling, which results in an additional pressure drop.
  • the counterflow device like the counter surface (e.g. counter roll), is at least as wide as the web.
  • a particularly advantageous solution consists in that the counterflow device is attached directly to the application unit or forms a structural unit with it.
  • the counterflow device can be brought particularly close to the application site and the air boundary layer can be pushed and removed particularly effectively. If the distance from the job site was greater, there would be a risk of the air boundary layer building up again, and this is to be avoided.
  • the counterflow device according to the invention can be used particularly expediently in connection with a free jet nozzle known per se.
  • a free jet nozzle applies the application medium to the corresponding web side under pressure and in a free jet and is known, for example, from EP 0675984.
  • the counterflow device can be attached in a simple manner on the upstream or the inlet-side free jet nozzle lip.
  • the lip on the inlet side is understood to mean the lip that the web runs towards, whereas the lip on the outlet side is understood to mean the lip from which the fibrous web runs or runs away from the feed gap of the free jet nozzle.
  • the lip on the inlet side forms the wing for the counterflow device or forms a structural unit with it.
  • This arrangement achieves the above-mentioned particularly close arrangement at the application site (this is the point of impact of the application medium on the web side to be coated).
  • the counterflow device can also be used in combination with other known types of application units, but without the double action described above.
  • FIG. 1 shows a counter surface 1, which in the example represents a roller.
  • This counter surface 1 supports a fibrous web 2 made of paper or cardboard, the running speed of which is over 2000 m / min and the web width of which can be at least 8 m.
  • the direction of rotation of roller 1 and the direction of travel of web 2 is indicated by a thick arrow L.
  • an application unit 3 in the form of a free jet nozzle is assigned to the web side to be coated.
  • the free jet nozzle includes, among other things, an inlet lip 3.1 (i.e. upstream lip) and an outlet side (i.e. downstream) lip 3.2.
  • the lips 3.1 and 3.2 form a dosing gap 3.3 between them, which (with Medium M filled) distribution pipe 3.4 and from which the application medium M emerges at the nozzle outlet 3.5.
  • the application medium then hits the running web at the job site or job point AP as a free, that is, unsupported, jet flowing through the environment.
  • the lip 3.1 is designed such that it can accommodate a counterflow device 4.
  • This counterflow device 4 is in turn designed as a nozzle for a pressure fluid, in particular steam, but also compressed air. It also has an upstream wall 4.1 and a downstream wall 4.2.
  • the wall 4.2 and the wall 4.1 each have a guide surface 4.3 and 4.4, which in turn form a nozzle channel 4.5.
  • Said fluid emerges from the nozzle opening 4.6 from the nozzle channel 4.5 and can thus counteract the air boundary layer LG.
  • the guide surface 4.4 is therefore concave and the guide surface 4.3 is convexly curved.
  • the counterflow device 4 is fed by a device 5, consisting of (not specifically designated) pressure fluid supply line, pump and valve.
  • the wall 4.2 shows an acute-angled cross section. With the tip, the device 4 can therefore protrude far into the gusset Z located between the application unit 3 and the web 3 and thus very effectively keep the application point AP free of air entry.
  • FIG. 1 An action diagram of the air boundary layer LG is also shown in FIG. 1 using arrows. The influence is greatest in the area of the surfaces of the web 2. Above the web, the air boundary layer is primarily introduced by the rotating counter-roller 1, so that without the counter-current device 4, the web 2 would flutter and form a type of bulge B, as shown by the broken line in the figure. Due to the generated fluid counterflow F GS , the web is now in contact with the counter roller 1, which, as already described, ensures a stable web run and an even application of medium.

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  • Paper (AREA)
EP03103477A 2002-09-27 2003-09-22 Dispositif d'enduction pour déposer un materiau fluide ou pâteux sur une bande en mouvement Withdrawn EP1403428A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10245072 2002-09-27
DE2002145072 DE10245072A1 (de) 2002-09-27 2002-09-27 Auftragswerk

Publications (1)

Publication Number Publication Date
EP1403428A1 true EP1403428A1 (fr) 2004-03-31

Family

ID=31969639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03103477A Withdrawn EP1403428A1 (fr) 2002-09-27 2003-09-22 Dispositif d'enduction pour déposer un materiau fluide ou pâteux sur une bande en mouvement

Country Status (2)

Country Link
EP (1) EP1403428A1 (fr)
DE (1) DE10245072A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5340402A (en) * 1992-02-21 1994-08-23 J.M. Voith Gmbh Nozzle applicator for application of coating color on a paper web
EP0911446A2 (fr) * 1997-10-24 1999-04-28 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour appliquer un matériau d'enduction liquide ou pâteux sur une bande de papier ou de carton
US5914155A (en) * 1996-12-18 1999-06-22 Voith Sulzer Papiermaschinen Gmbh Method and applicator for direct or indirect application of a liquid or pasty coating medium onto a traveling material web, notably of paper or cardboard
US6146690A (en) * 1998-07-01 2000-11-14 Voith Sulzer Papiertechnik Patent Gmbh Coating device and coating method
US6248407B1 (en) * 1998-05-07 2001-06-19 Voith Sulzer Papiertechnik Gmbh Method for applying a coating medium onto a moving surface
WO2001068981A1 (fr) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Dispositif d'application
EP1142647A2 (fr) * 2000-04-03 2001-10-10 Mitsubishi Heavy Industries, Ltd. Appareil et procédé d'application d'un revêtement
US20020018855A1 (en) * 1992-09-11 2002-02-14 Stora Enso North America Corp. Apparatus for decreasing skip coating on a paper web

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI105533B (fi) * 1992-10-26 2000-09-15 Valmet Paper Machinery Inc Suihkupäällystyslaitteisto ja -menetelmä
DE9211302U1 (de) * 1992-08-22 1992-10-08 Hoechst Ag, 6230 Frankfurt Vorrichtung zum Erzeugen eines Unterdrucks
DE19532388C1 (de) * 1995-09-01 1996-12-19 Voith Sulzer Papiermasch Gmbh Vorrichtung zum Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton
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

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5340402A (en) * 1992-02-21 1994-08-23 J.M. Voith Gmbh Nozzle applicator for application of coating color on a paper web
US20020018855A1 (en) * 1992-09-11 2002-02-14 Stora Enso North America Corp. Apparatus for decreasing skip coating on a paper web
US5914155A (en) * 1996-12-18 1999-06-22 Voith Sulzer Papiermaschinen Gmbh Method and applicator for direct or indirect application of a liquid or pasty coating medium onto a traveling material web, notably of paper or cardboard
EP0911446A2 (fr) * 1997-10-24 1999-04-28 Voith Sulzer Papiertechnik Patent GmbH Procédé et dispositif pour appliquer un matériau d'enduction liquide ou pâteux sur une bande de papier ou de carton
US6248407B1 (en) * 1998-05-07 2001-06-19 Voith Sulzer Papiertechnik Gmbh Method for applying a coating medium onto a moving surface
US6146690A (en) * 1998-07-01 2000-11-14 Voith Sulzer Papiertechnik Patent Gmbh Coating device and coating method
WO2001068981A1 (fr) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Dispositif d'application
EP1142647A2 (fr) * 2000-04-03 2001-10-10 Mitsubishi Heavy Industries, Ltd. Appareil et procédé d'application d'un revêtement

Also Published As

Publication number Publication date
DE10245072A1 (de) 2004-04-08

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