EP1621669A1 - Dispositif pour l'application direct d' un medium liquide ou pateux sur une bande de materiel en movement continu - Google Patents

Dispositif pour l'application direct d' un medium liquide ou pateux sur une bande de materiel en movement continu Download PDF

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Publication number
EP1621669A1
EP1621669A1 EP05105173A EP05105173A EP1621669A1 EP 1621669 A1 EP1621669 A1 EP 1621669A1 EP 05105173 A EP05105173 A EP 05105173A EP 05105173 A EP05105173 A EP 05105173A EP 1621669 A1 EP1621669 A1 EP 1621669A1
Authority
EP
European Patent Office
Prior art keywords
support surface
fibrous web
strip element
web
roller
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Withdrawn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
EP05105173A
Other languages
German (de)
English (en)
Inventor
Christoph Henninger
Benjamin Méndez-Gallon
Ingo Gottwald
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 Patent GmbH
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 Patent GmbH, Voith Paper Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1621669A1 publication Critical patent/EP1621669A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to a device for direct application of a liquid to pasty medium on a running paper, cardboard or other fibrous web, according to the preamble of claim 1.
  • Generic devices are usually used in the context of coating machines to treat the running fibrous web on one or both sides with one or more commissioned works and with one or more layers of the application medium.
  • the application medium is pigment-containing coating color, glue, starch or an impregnating liquid.
  • the liquid to pasty medium is applied by an application device directly onto the surface of the moving material web.
  • the fibrous web wraps around during the order mostly a circumferential counter or support surface, which is usually a roller, but can also be an endless belt.
  • a device with an air boundary layer removal device is known with which both the entrained by the material web and by a support roller air boundary layer should be avoided.
  • the said air boundary layer removal device is arranged in the inlet gusset between the material web and the support roller.
  • the described air boundary layer removal device also includes, among other things, an air boundary layer suction device.
  • it comprises a blowing device which ejects a gaseous medium.
  • the outflow opening is directed so that the gaseous medium blows substantially counter to the direction of rotation of the support roller and web.
  • the gaseous medium also blows into the inlet gusset in the opposite direction (ie in the direction of rotation of the roller and the material web).
  • a baffle is still present, which deflects the injected amount of gas and now leads against the direction of rotation of the support roller and the direction of travel of the web of material from the inlet gusset, whereby the entry of the air boundary layer is prevented.
  • the present invention is therefore an object of the invention to further develop a generic device of only a small expenditure on equipment, with the negative effects of the air boundary layers can be minimized or avoided.
  • the device according to the invention based on the direction of rotation of the support surface arranged in front of the applicator flat strip element, which spans the free cross section between the surface of the support surface or a point on the surface and the support surface tapering fibrous web substantially.
  • the strip element spans the mostly acute-angled, wedge-shaped inlet gusset between the support surface and the fibrous web and thereby forms an almost closed inlet gusset, but above all a deflection surface for the inflowing air boundary layers.
  • a diffuser effect is achieved, which causes the air deflection and the unwanted air boundary layers can not get into the inlet gusset.
  • the strip element itself is flat and flat. It extends transversely to the web running direction. In its length, it is at least adapted to the width of the commissioned work.
  • the strip element does not contact the support surface and the material web during operation of the device, but points of contact can not be ruled out but are not detrimental either.
  • the strip element acts as a Heilabweiser, whereby further inflowing air as I said, distracted and securely held back from the subsequent job site.
  • the device according to the invention allows driving higher operating speeds, greater track widths and also allows greater freedom in the choice of the wrap angle of the material web around the support surface.
  • FIG. 1 shows a device 1 according to the invention for direct application of a liquid to pasty medium onto a moving fibrous web 2 (paper or board web).
  • the device 1 comprises a support surface 3, which is partially looped around by the fibrous web 2, in the form of a roll, which supports a web side 2.2 facing this support roll 3.
  • support surface could also be provided an endless support band.
  • the support roll 3 provided here forms with its surface 3a and the material web side 2.2 a wedge-shaped tapered inlet gusset Z E. This region is also referred to as inlet or inlet side, because here the fibrous web 2 of the support surface or support roller 3 tapers.
  • the direction of rotation of the roller 3 is indicated in all figures by an arrow P.
  • the device 1 comprises a support roller 3 associated applicator 4 for coating the side facing away from the support roller 3 web page 2.4 with coating medium M.
  • the applicator 4 is in the example a downstream in the direction L of the web 2 doctor device 5 downstream, with the previously in excess applied medium M is brought to the desired coating weight.
  • the squeegee 5 only serves to equalize the applied layer.
  • no squeegee device 5 also needs to be present. Therefore, in Fig. 2, the squeegee device has been omitted.
  • the commissioned work 4 should be understood as a free-jet nozzle or spray nozzle, or curtain nozzle device, and as a doctor element a doctor blade 5.1. It is understood that other known commissioned work types, such as roller or Short Dwell Time commissioned work and other doctoring elements, such as air brushes or doctor blades or rotary squeegee rods can be used.
  • a strip element 6 extending over the entire width of the machine is provided in front of the applicator unit 4 for weakening the influence of the air boundary layer LG introduced with the fibrous web 2 and the support roller 3.
  • the respectively to be considered air boundary layers LG are indicated in the figures with thin arrow lines.
  • the machine-wide strip element 6 spans the free cross section f Q of the inlet gusset Z E. Its end 6a is close to the surface 3a of the support surface 3 and the other end 6b in operative proximity of the incoming fibrous web 2, without ideal Support surface and / or web to touch. However, the ends 6a and 6b of the strip element can be provided with a wear protection layer for wear protection reasons.
  • the strip element 6 has a constant and small thickness d. This makes it very easy and can also be retrofitted into existing devices.
  • the relative position of the strip element 6 between the fibrous web 2 and the roller 3 and / or the width b of the strip element 6.1, for example by telescoping widening, are adjustable. As a result, the inlet gusset Z E can be protected better than previously against inflowing air boundary layers L G.
  • the strip element 6 is in a first variant above a fibrous web 2 the applicator 4 supplying adjustable guide roller 9, wherein the guide roller 9 is located on the web side 2.3, ie outside the inlet gusset.
  • FIG. 3 shows that the guide roller 9 and also a suction roller 10 of the web side 2.2. can be assigned.
  • FIG. 2 shows a further variant, where the strip element also lies above one of the guide roller 9 and the other side of the track 2.2. associated suction roller 10 is attached.
  • strip element 6 ' located below the roller 9 or 10
  • the distance s (or the radian measure) between that of the support roller. 3 facing the end of the strip element 6 and the emergence point A of the fibrous web 2 on the roller 3 should be as low as possible in terms of a particularly effective air repellency and the avoidance of rebuilding the air boundary layer. Therefore, the latter variant with strip element 6 'and distance s' is even more advantageous than the arrangement shown in thick lines, in which the strip element 6 is arranged at a distance s and above the roller 9 and 10, respectively.
  • the guide roller 9 is adjustable in position in the direction of the arrows. This makes it possible to set the size of the cross-sectional area of the inlet gusset Z E or of the free cross-section f Q to be covered, as indicated by the dashed line.
  • FIG. 3 also shows the arrangement of blowing nozzles 11 and 12 above the gaps 7 and 8. Both blowing nozzles 11 and 12 generate a counterflow of air which is directed counter to the air boundary layers L G flowing with the support roll 3 and in the running direction L of the fibrous web.
  • the inlet gusset Z E is additionally protected against air inflows, so that neither train lifts, floating effects, air pockets and / or wrinkles form under operating conditions and furthermore web breaks can be avoided.
  • strip element 6, 6 ', 6 can be fastened to the front side and outside of the device, for example to the stiffening parts of the coating machine, which is not shown in the figures.
  • Said strip element 6, 6 ', 6 " is made of metal, preferably stainless steel or else plastic, preferably fiber-reinforced material, and has a very flat design. It has a low weight and is therefore easy to handle and likewise easy to install and remove.
  • strip element 6, 6 ', 6 at least partially, at least its ends 6a and 6b (ie its longitudinal edges), as already mentioned above, made of wear-resistant material and / or a material with a low friction factor, such as PTFE (polytetrafluoroethylene ) or are coated with it, whereby any contact of the moving fibrous web 2 and the support roller 3 remain harmless.
  • PTFE polytetrafluoroethylene
  • the strip element 6, 6 ', 6 has only a small thickness d, which is between 0.1 and 5 mm, and the thickness d in the case of a design in plastic is approximately 0.3 to 2 mm and in a metal version about 0.1 to 1 mm.
  • the width b of the strip element 6, 6 ', 6 " is approximately 20-60% of the diameter of the existing support roller 3.

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  • Coating Apparatus (AREA)
EP05105173A 2004-07-30 2005-06-14 Dispositif pour l'application direct d' un medium liquide ou pateux sur une bande de materiel en movement continu Withdrawn EP1621669A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410037214 DE102004037214A1 (de) 2004-07-30 2004-07-30 Vorrichtung zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn

Publications (1)

Publication Number Publication Date
EP1621669A1 true EP1621669A1 (fr) 2006-02-01

Family

ID=35106903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05105173A Withdrawn EP1621669A1 (fr) 2004-07-30 2005-06-14 Dispositif pour l'application direct d' un medium liquide ou pateux sur une bande de materiel en movement continu

Country Status (2)

Country Link
EP (1) EP1621669A1 (fr)
DE (1) DE102004037214A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008015043A1 (fr) * 2006-08-04 2008-02-07 Voith Patent Gmbh Dispositif d'application
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553340A (en) * 1983-05-30 1985-11-19 Flakt Aktiebolag Sealing device in a cylinder drier
US4665631A (en) * 1985-05-13 1987-05-19 Thermo Electron Web Systems, Inc. Air sealing nozzle for high speed dryer
US5506005A (en) * 1993-01-13 1996-04-09 Valmet Corporation Method and assembly for preventing air entry between a moving material web and a roll
DE19702605A1 (de) * 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
DE19839916A1 (de) * 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zur Verminderung des Volumens oder Drucks eines Fluids, das von sich bewegenden Oberflächen in einen Spalt eingeschleppt wird
DE10012347A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Vorhang- Auftragsvorrichtung
EP1479823A1 (fr) * 2003-05-06 2004-11-24 Voith Paper Patent GmbH Dispositif d'application directe de produit fluide ou pateux sur un substrat défilant

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553340A (en) * 1983-05-30 1985-11-19 Flakt Aktiebolag Sealing device in a cylinder drier
US4665631A (en) * 1985-05-13 1987-05-19 Thermo Electron Web Systems, Inc. Air sealing nozzle for high speed dryer
US5506005A (en) * 1993-01-13 1996-04-09 Valmet Corporation Method and assembly for preventing air entry between a moving material web and a roll
DE19702605A1 (de) * 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn
DE19839916A1 (de) * 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zur Verminderung des Volumens oder Drucks eines Fluids, das von sich bewegenden Oberflächen in einen Spalt eingeschleppt wird
DE10012347A1 (de) * 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Vorhang- Auftragsvorrichtung
EP1479823A1 (fr) * 2003-05-06 2004-11-24 Voith Paper Patent GmbH Dispositif d'application directe de produit fluide ou pateux sur un substrat défilant
DE10319988A1 (de) * 2003-05-06 2004-11-25 Voith Paper Patent Gmbh Vorrichtung zum direkten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008015043A1 (fr) * 2006-08-04 2008-02-07 Voith Patent Gmbh Dispositif d'application
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
DE102004037214A1 (de) 2006-03-23

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