EP1208917B1 - Vorhang-Auftragsvorrichtung - Google Patents

Vorhang-Auftragsvorrichtung Download PDF

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Publication number
EP1208917B1
EP1208917B1 EP01124923A EP01124923A EP1208917B1 EP 1208917 B1 EP1208917 B1 EP 1208917B1 EP 01124923 A EP01124923 A EP 01124923A EP 01124923 A EP01124923 A EP 01124923A EP 1208917 B1 EP1208917 B1 EP 1208917B1
Authority
EP
European Patent Office
Prior art keywords
application medium
layer
applicator according
application
curtain
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
EP01124923A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1208917A3 (de
EP1208917A2 (de
Inventor
Manfred Ueberschär
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 EP1208917A2 publication Critical patent/EP1208917A2/de
Publication of EP1208917A3 publication Critical patent/EP1208917A3/de
Application granted granted Critical
Publication of EP1208917B1 publication Critical patent/EP1208917B1/de
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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • 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
    • 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
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters

Definitions

  • the invention relates to a device for applying at least one first layer and at least one second layer of liquid or pasty application medium, in particular aqueous pigment suspension, to a running substrate, wherein the substrate for direct application, the surface of a web, in particular of paper or cardboard, and indirect Application is the surface of a transfer element, preferably a transfer roller, which then transfers the application medium to the surface of the material web, and wherein the applicator device comprises at least two curtain applicators, each of which the respective application medium from a dispensing nozzle as a substantially gravitationally moving curtain or give off veils to the ground.
  • a "substantially gravity-related" movement of the application medium curtain is understood here to mean that, of all the forces driving the application medium to the ground, gravity has the greatest influence on the application medium curtain.
  • the gravitational motion may also be assisted by other forces (for example, electrostatic forces) or otherwise affected (eg, viscous friction when moving along a baffle).
  • the material web may basically be a paper web, a board web, a film web or a textile web
  • the invention will be explained in more detail with reference to the example of the production of special papers.
  • specialty papers may include, for example, carbonless paper (CB, CF or CFB paper), paper for inkjet printers, siliconized paper, Thermal paper, photosensitive paper sensitive to heat and heat and the like papers.
  • the application medium is "framed" by auxiliary media, which are intended to prevent harmful external influences of the actual application medium curtain.
  • auxiliary media which are intended to prevent harmful external influences of the actual application medium curtain.
  • the applicator used for applying a single layer of application medium already has a complicated structure.
  • a mixing of the application medium with the auxiliary media can not be completely avoided, which entails further problems.
  • US-A-4,230,743 discloses an applicator according to the preamble of claim 1.
  • the water retention capacity of the application layer forming the first layer is smaller than the water retention capacity of the second layer forming order medium.
  • the density of the application medium forming the first layer is at least 10% higher than the density of the application medium forming the second layer.
  • the viscosity of the application medium forming the first layer is greater than the viscosity of the application medium forming the second layer, since this contributes to avoiding damage to the precoat (first application medium) as a result of the tensile load during the application of the topcoat (second application medium) helps.
  • the application medium may be an aqueous solution or an aqueous dispersion of solid particles, for example an acrylate or butadiene styrene dispersion.
  • the solid particles may be mineral pigments or microscopic plastic particles, For example, plastic or ink-filled microcapsules, or starch include.
  • the solids content of the coating medium may be between about 5% by weight and about 70% by weight.
  • the coating medium may have a Brockfield viscosity of between about 10 mPas and about 2000 mPas at 100 rpm.
  • the application medium forming the first layer can be applied to the substrate with a layer thickness of between approximately 2 ml / m 2 and approximately 20 ml / m 2 .
  • the application medium forming the second layer can be provided with a Layer thickness of between about 5 ml / m 2 and about 30 ml / m 2 are applied to the substrate.
  • the application media for the formation of the first and second application layers discussed above are based in particular on the application of the production of graphic papers, in particular self-copy paper.
  • the precoat (first application medium) has, on the one hand, the task of providing a barrier layer for the ink-filled microcapsules contained in the top coat (second application medium), which securely holds them to the surface of the copying paper.
  • the top coat (second application medium)
  • it also has the task to compensate for the unevenness of the base paper and to form a smooth primer for the top coat, so that the top coat can be readily formed with a over the entire surface of the material web substantially constant thickness. This is of great importance for an equally uniform distribution of the microcapsules and thus for a uniform color density of the lines obtained by means of the self-copy paper.
  • the microcapsule-containing medium can be applied with the aid of the curtain application method very gently.
  • At least one of the application media is applied to the substrate substantially ready-metered ("1: 1" order), which is advantageous in several respects.
  • this can reduce the circulating quantities of application medium.
  • This allows the use of less efficient and thus cheaper pumps, paint lines with a smaller cross-sectional area, smaller reservoirs and the like.
  • the risk of air accumulation in the order media which is associated with a large amount of circulation, and thus of an aging of the order media can also be reduced.
  • the "1: 1" order still allows a reduction in the contamination of the order media with water, fibers or other substances that can detach from the raw or even pre-coated material web.
  • At least one guide element is arranged in the fall path of the curtain or veil, which guides the curtain or veil along at least part of the fall path substantially over its entire width.
  • the words "run along the fall path” can also mean that the application medium curtain can be deflected by the guide element from the path corresponding to the free fall.
  • the beneficial effect that this baffle has on the application medium curtain is most likely due to the fact that the application medium initially slows down somewhat on contact with the baffle, which stabilizes the shape of the application medium curtain. With increasing movement of the application medium along the guide element but then decreases the falling speed, more precisely, the flow rate of the application medium along the guide element, again.
  • the total height of fall of the curtain and thus the overall achievable gravity extension can be increased compared with a conventional free-falling application medium curtain without sacrificing the quality of the application medium layer formed therewith.
  • the area between the curtain applicators has a device for influencing the pressure prevailing there and, in particular, the pressure at the application medium curtains and the substrate assigned.
  • both the generation of a negative pressure and the generation of an overpressure may be favorable.
  • Underpressure can on the one hand, the detachment of the first application medium curtain from a guide blade (ie a guide that is employed to weaken a carried by the underground air boundary layer against this employed) and on the other hand, the wetting of the top coat on the precoat can be improved.
  • both curtains for primer and top coat
  • an applicator device serves to apply a multilayer coating 12 to a substrate U moving in the running direction L, for example a paper web 14.
  • the application device 10 comprises a first curtain application unit 16 which applies a first application medium 18, for example a starch solution or starch suspension, as a precoat 20 to the surface 14a of the paper web 14. Furthermore, the application device 10 comprises a second curtain applicator 22, the application medium 24 as a top coat 26 applied to the applied by the first curtain applicator 16 precoat 20.
  • the coating medium 24 of the top coat 26 may be, for example, a dispersion or suspension of ink-filled microcapsules, these microcapsules being in Fig. 1 dotted are indicated.
  • Both applicators 16 and 22 are the application medium 18 and 24 in the form of a coating medium curtain 28 and 30 from.
  • a guide blade 32 or 34 is provided whose length in the flow direction of the application medium 18 or 24 depending on the properties of the respective application medium dimensioned or adjusted such that the application medium Curtain 28 and 30 subsequent to the tear-off edge 32a and 34a, a substantially vertical course (direction V) takes, so neither the so-called “teapot effect" shows, still parabolic over the tear-off edge 32a and 34a "shoots out”.
  • a scraper element 36 is also employed against the surface 14a of the paper web 14.
  • the scraper element 36 intercepts the application medium curtain 28, stabilizes it due to the viscous frictional forces between the application medium 18 and the surface 36a of the scraper element 36 and directs the application medium 18 to the surface 14a of the paper web 14th
  • the two impact points 38 and 40 of the pre-coat curtain 28 and the cover curtain 30 have a distance D from one another which is between about 100 mm and about 500 mm. This distance D is sufficient to immobilize the precoat 20 sufficiently on the paper web surface 14a, so that an impairment or even damage to the precoat 20 by the impact of the top coat curtain 30 is not to be feared.
  • a suction / blowing box 42 is provided between the two curtain applicators 16 and 22.
  • the pressure in a space 44 which is enclosed by the two applicators 16 and 22, the two application medium curtains 28 and 30, the paper web 14 and the suction / blow box 42 itself, to be changed.
  • the suction of air to generate a negative pressure in the space 44 and the blowing of air to generate an overpressure in this space are in Fig. 1 indicated by the arrows S (suction) and B (bubbles).
  • the detachment of the pre-coat curtain 28 from the guide scraper 36 and, on the other hand, the wetting of the top coat 26 on the precoat 20 can be improved.
  • the precoat 20 can be anchored better on the paper web 14 and, on the other hand, both curtains 28 and 30 can be stabilized since the overpressure reduces their tendency to flutter.
  • FIG. 2 an example of an application system 50 is shown in which the application device 10 according to the invention can be used.
  • the material web 14 which moves in the running direction L is provided on its surface 14a with a "wet-on-wet" application 12 by the curtain coating device 10 according to the invention.
  • a coating layer 54 is also applied to the rear side 14b of the material web 14.
  • This back coating of the material web 14 takes place by means of an indirectly operating applicator 52, which first applies the application medium to the surface 56a of a transfer roller 56, which then conveys the application medium 58 to the material web 14.
  • the roller 56 also serves in the illustrated application system 50 as a web deflecting element for the material web 14.
  • this web-guiding element 60 is designed as a web-deflecting element which operates without contact, preferably as a so-called air-turn, in order to prevent impairment of the "wet-on-wet" application 12 by the web-guiding element 60.
  • a drying device 62 Downstream of the web guiding element 60, a drying device 62 then follows.
  • the order system 50 according to Fig. 2 is characterized by a particularly simple web guide, wherein the material web runs unsupported, in particular in the area of the curtain application device 10.
  • the material web 14 can therefore be coated in three times in a very gentle manner.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Saccharide Compounds (AREA)
EP01124923A 2000-11-22 2001-10-19 Vorhang-Auftragsvorrichtung Expired - Lifetime EP1208917B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10057729A DE10057729A1 (de) 2000-11-22 2000-11-22 Vorhang-Auftragsvorrichtung
DE10057729 2000-11-22

Publications (3)

Publication Number Publication Date
EP1208917A2 EP1208917A2 (de) 2002-05-29
EP1208917A3 EP1208917A3 (de) 2005-03-30
EP1208917B1 true EP1208917B1 (de) 2008-02-27

Family

ID=7664105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01124923A Expired - Lifetime EP1208917B1 (de) 2000-11-22 2001-10-19 Vorhang-Auftragsvorrichtung

Country Status (5)

Country Link
US (2) US20020066404A1 (ja)
EP (1) EP1208917B1 (ja)
JP (1) JP3942874B2 (ja)
AT (1) ATE387262T1 (ja)
DE (3) DE10057729A1 (ja)

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CN101253002B (zh) * 2005-08-30 2012-03-21 关西涂料株式会社 形成亮光多层涂膜的方法
JP4902983B2 (ja) * 2005-11-01 2012-03-21 ボイス ペ−パ− パテント ゲ−エムベ−ハ− 塗工装置および塗工方法
JP4902984B2 (ja) * 2005-11-01 2012-03-21 ボイス ペ−パ− パテント ゲ−エムベ−ハ− 塗工装置および塗工方法
DE102006036450A1 (de) * 2006-08-04 2008-02-07 Voith Patent Gmbh Auftragsvorrichtung
SG144053A1 (en) * 2006-12-19 2008-07-29 Hitachi Magnet Wire Corp Varnish coating device and method for coating a varnish
JP5239011B2 (ja) 2008-01-22 2013-07-17 ボイス パテント ゲーエムベーハー タンデム型カーテンコータのエアーカット装置
DE102008041419A1 (de) * 2008-08-21 2010-02-25 Voith Patent Gmbh Vorrichtung zur Erzeugung von beschichteten Papier-, Karton- oder anderen Faserstoffbahnen mit zumindest einer thermosensitiven Schicht und Verfahren zum Betreiben einer derartigen Vorrichtung
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JP5338427B2 (ja) * 2009-03-30 2013-11-13 王子ホールディングス株式会社 カーテン塗工装置
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Also Published As

Publication number Publication date
US20040166244A1 (en) 2004-08-26
EP1208917A3 (de) 2005-03-30
ATE387262T1 (de) 2008-03-15
DE50113656D1 (de) 2008-04-10
DE20023956U1 (de) 2007-12-06
EP1208917A2 (de) 2002-05-29
DE10057729A1 (de) 2002-05-23
JP3942874B2 (ja) 2007-07-11
JP2002192047A (ja) 2002-07-10
US20020066404A1 (en) 2002-06-06

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