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EP0350606B1 - Device for humidifying a moving substrate - Google Patents

Device for humidifying a moving substrate Download PDF

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Publication number
EP0350606B1
EP0350606B1 EP89109445A EP89109445A EP0350606B1 EP 0350606 B1 EP0350606 B1 EP 0350606B1 EP 89109445 A EP89109445 A EP 89109445A EP 89109445 A EP89109445 A EP 89109445A EP 0350606 B1 EP0350606 B1 EP 0350606B1
Authority
EP
European Patent Office
Prior art keywords
substrate
charging
atomiser
electrode
continuous loop
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
EP89109445A
Other languages
German (de)
French (fr)
Other versions
EP0350606A3 (en
EP0350606A2 (en
Inventor
Ernst-August Hahne
Hermann Künzig
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.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik 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 Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Priority to AT89109445T priority Critical patent/ATE93168T1/en
Publication of EP0350606A2 publication Critical patent/EP0350606A2/en
Publication of EP0350606A3 publication Critical patent/EP0350606A3/en
Application granted granted Critical
Publication of EP0350606B1 publication Critical patent/EP0350606B1/en
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
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes

Definitions

  • the invention relates to a device according to the preamble of the main claim.
  • Such a device is known (DE-OS 22 19 994).
  • an electrode is provided either at a short distance from the paper web or directly adjacent to it. Apart from the fact that this device is not suitable for high-speed paper webs and can lead to destruction of the paper web, a not inconsiderable abrasion on the surface of the electrode can also be expected. In addition, direct contact with high-speed paper webs cannot be guaranteed because of the air cushion that forms between the electrode and the web.
  • this known device is only moderately suitable for moistening when substrates with a higher pre-moisture or other conductivity have to be moistened, through which the conductivity of the substrate immediately rises, whereby the penetration of the electric field through the substrate to the conductive aerosol generator is prevented or even is completely prevented. As a result, the aerosols are no longer aligned with respect to the electrode.
  • the invention has for its object to provide a generic device according to the preamble of the main claim with always good and independent of the pre-moisture efficiency. This object is achieved according to the invention in a generic device according to the preamble of the main claim that the electrode device is designed as an emitting charging device with at least one emission charging electrode (20).
  • the back of the substrate is hereby coated according to the invention even with a charge of the emitting charging electrode, so that the electric field forces act all the more on the atomizer from the charged substrate, so that the aerosols are prevented from vagabonding.
  • the electric field strength was so high that the mirror image of the high voltage is generated by influence on the grounded metallic surface of the aerosol dispenser and the detached aerosols are charged with the opposite polarity of the charging electrode so that they are charged accelerated and aligned, which, in contrast to the known device, not only wets the surface of the substrate, but can also penetrate into the pores thereof.
  • the device serves to moisten a substrate 6 in the form of a circumferential web, preferably made of paper, which is moistened by means of an atomizer 7, designated as 8 small water droplets, namely aerosols.
  • a charging device which is connected to a voltage source, designated as a whole with 13, the other side of which is grounded.
  • the other side of the voltage source denoted by 13 is provided with four individual emission charging electrodes 20, each of which, however, can also be connected individually to a high-voltage source such that the potential can be regulated separately.
  • the charge that is emitted by the emission charging electrodes 20 is applied contactlessly to the back of the substrate.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
  • Elimination Of Static Electricity (AREA)
  • Manufacturing Of Printed Wiring (AREA)

Abstract

The device serves for humidifying a moving substrate with a liquid, an atomiser for the liquid facing the front side of the substrate being present, as well as an electrical high-voltage source and a charging device for the directed conveying of the atomised liquid onto the substrate. In this arrangement, the support device has an electrically conductive circumferential continuous loop on its upper side and an electrically insulated circumferential continuous loop on its lower side, which loop faces the rear of the substrate and rests against the latter with its side and runs around it with a relative speed thereto of zero. Furthermore, the charging device also has a charging component for the upper side of the continuous loop. The charging can also occur in a contactless manner by corona charging.

Description

Die Erfindung betrifft eine Vorrichtung gemäß dem Oberbegriff des Hauptanspruchs.The invention relates to a device according to the preamble of the main claim.

Eine solche Vorrichtung ist bekannt (DE-OS 22 19 994). Bei dieser bekannten Einrichtung wird eine Elektrode entweder mit geringem Abstand von der Papierbahn, oder unmittelbar an dieser anliegend vorgesehen. Abgesehen davon, daß diese Vorrichtung für schnellaufende Papierbahnen nicht geeignet ist und zu Zerstörungen der Papierbahn führen kann, ist auch mit einem nicht unbeträchtlichen Abrieb an der Oberfläche der Elektrode zu rechnen. Hinzu kommt, daß der unmittelbare Kontakt bei schnellaufenden Papierbahnen wegen des sich zwischen der Elektrode und der Bahn ausbildenden Luftpolsters nicht gewährleisten werden kann.Such a device is known (DE-OS 22 19 994). In this known device, an electrode is provided either at a short distance from the paper web or directly adjacent to it. Apart from the fact that this device is not suitable for high-speed paper webs and can lead to destruction of the paper web, a not inconsiderable abrasion on the surface of the electrode can also be expected. In addition, direct contact with high-speed paper webs cannot be guaranteed because of the air cushion that forms between the electrode and the web.

Auch diese bekannte Vorrichtung eignet sich jedoch dann nur mäßig zum Befeuchten, wenn Substrate mit einer höheren Vorfeuchte oder sonstigen Leitfähigkeit angefeuchtet werden müssen, durch die sofort die Leitfähigkeit des Substrates ansteigt, womit der Durchgriff des elektrischen Feldes durch das Substrat zum leitfähigen Aersolerzeuger verhindert oder sogar gänzlich unterbunden wird. Hierdurch bedingt sind die Aerosole nicht mehr ausgerichtet mit Bezug auf die Elektrode.However, this known device is only moderately suitable for moistening when substrates with a higher pre-moisture or other conductivity have to be moistened, through which the conductivity of the substrate immediately rises, whereby the penetration of the electric field through the substrate to the conductive aerosol generator is prevented or even is completely prevented. As a result, the aerosols are no longer aligned with respect to the electrode.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung gemäß dem Oberbegriff des Hauptanspruches mit stets gutem und von der Vorfeuchte unabhängigem Wirkungsgrad bereitzustellen. Diese Aufgabe wird bei einer gattungsgemäßen Vorrichtung gemäß dem Oberbegriff des Hauptanspruchs erfindungsgemäß dadurch gelöst,
   daß die Elektrodeneinrichtung als emittierende Aufladeeinrichtung mit zumindest einer Emissions-Aufladeelektrode (20) ausgebildet ist.The invention has for its object to provide a generic device according to the preamble of the main claim with always good and independent of the pre-moisture efficiency. This object is achieved according to the invention in a generic device according to the preamble of the main claim
that the electrode device is designed as an emitting charging device with at least one emission charging electrode (20).

Die Rückseite des Substrates wird hiermit erfindungsgemäß selbst mit einer Ladung der emittierenden Aufladeelektrode beschichtet, so daß die elektrischen Feldkräfte vom geladenen Substrat aus umsomehr auf den Zerstäuber einwirken, so daß das Vagabundieren der Aerosole verhindert ist. Durch die hohe Potentialdifferenz zwischen dem aufgeladenen Substrat und dem Zerstäuber herrschten infolgedessen eine so hohe elektrische Feldstärke, daß an der geerdeten metallischen Oberfläche des Aerosolspenders das Spiegelbild der Hochspannung durch Influenz erzeugt wird und die abgelösten Aerosole mit der Gegenpolarität der Aufladeelektrode so geladen sind, daß diese beschleunigt und ausgerichtet werden, wodurch sie im Gegensatz zu den bekannten Vorrichtung nicht nur die Oberfläche des Substrates benetzen, sondern auch in die Poren desselben eindringen können.The back of the substrate is hereby coated according to the invention even with a charge of the emitting charging electrode, so that the electric field forces act all the more on the atomizer from the charged substrate, so that the aerosols are prevented from vagabonding. As a result of the high potential difference between the charged substrate and the atomizer, the electric field strength was so high that the mirror image of the high voltage is generated by influence on the grounded metallic surface of the aerosol dispenser and the detached aerosols are charged with the opposite polarity of the charging electrode so that they are charged accelerated and aligned, which, in contrast to the known device, not only wets the surface of the substrate, but can also penetrate into the pores thereof.

Zweckmäßige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Expedient refinements and developments of the invention are characterized in the subclaims.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert, die die Erfindung im schematischen Querschnitt zeigt.An embodiment of the invention is explained in more detail below with reference to the drawing, which shows the invention in schematic cross section.

Die insgesamt mit 5 bezeichnete Vorrichtung dient zum Befeuchten eines Substrates 6 in Form einer umlaufenden Bahn, vorzugsweise aus Papier, die mittels eines Zerstäubers 7 insgesamt mit 8 bezeichneten kleinen Wassertröpfchen, nämlich Aerosolen, befeuchtet wird.The device, designated overall by 5, serves to moisten a substrate 6 in the form of a circumferential web, preferably made of paper, which is moistened by means of an atomizer 7, designated as 8 small water droplets, namely aerosols.

Zum Zwecke der Verbesserung der Befeuchtung ist eine Aufladevorrichtung vorhanden, die an eine insgesamt mit 13 bezeichnete Spannungsquelle angeschlossen ist, deren andere Seite geerdet ist.For the purpose of improving the humidification, a charging device is present, which is connected to a voltage source, designated as a whole with 13, the other side of which is grounded.

Die andere Seite der mit 13 bezeichneten Spannungsquelle ist mit vier einzelnen Emissions-Aufladeelektroden 20 versehen, von denen jede aber auch einzeln an je einer Hochspannungsquelle so anschließbar ist, daß das Potential gesondert regelbar ist.The other side of the voltage source denoted by 13 is provided with four individual emission charging electrodes 20, each of which, however, can also be connected individually to a high-voltage source such that the potential can be regulated separately.

Hierbei wird die Ladung, die von den Emissions-Aufladeelektroden 20 abgegeben werden, kontaktlos auf die Rückseite des Substrates aufgebracht.In this case, the charge that is emitted by the emission charging electrodes 20 is applied contactlessly to the back of the substrate.

Claims (7)

  1. Apparatus for moistening a moving substrate (6), for example transported sheets or travelling webs, in particular of paper or plastics material, with a fluid, preferably water, comprising an atomiser (7) for the fluid (8), which faces towards the front side of the substrate, an electrical high-voltage source (13) and an electrode means for directed transportation of the atomised fluid on to the substrate, wherein the electrode means is arranged on the rear side (10) of the substrate (6), characterised in that the electrode means is in the form of an emitting charging means with at least one emission charging electrode (20).
  2. Apparatus according to claim 1 characterised in that the individual emission charging electrodes (10) can be connected to different potentials.
  3. Apparatus according to claim 1 or claim 2 characterised in that the charging means (20) is arranged substantially symmetrically relative to the atomiser (7).
  4. Apparatus according to the preceding claims characterised in that the charging means (20) is arranged upstream of the atomiser (7) in the direction of movement of the substrate.
  5. Apparatus according to claim 4 characterised in that the charging means (20) is arranged in opposite relationship to the atomiser (7).
  6. Apparatus according to one of claims 1 to 5 characterised in that the rollers (21) for deflecting the substrate (6) are insulated.
  7. Apparatus according to claim 6 characterised in that the rollers (21) have an electrically insulating surface.
EP89109445A 1988-07-13 1989-05-24 Device for humidifying a moving substrate Expired - Lifetime EP0350606B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89109445T ATE93168T1 (en) 1988-07-13 1989-05-24 DEVICE FOR WETTING A MOVED SUBSTRATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823739 1988-07-13
DE3823739A DE3823739A1 (en) 1988-07-13 1988-07-13 DEVICE FOR MOISTURIZING A MOVING SUBSTRATE

Publications (3)

Publication Number Publication Date
EP0350606A2 EP0350606A2 (en) 1990-01-17
EP0350606A3 EP0350606A3 (en) 1990-10-24
EP0350606B1 true EP0350606B1 (en) 1993-08-18

Family

ID=6358589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109445A Expired - Lifetime EP0350606B1 (en) 1988-07-13 1989-05-24 Device for humidifying a moving substrate

Country Status (4)

Country Link
EP (1) EP0350606B1 (en)
JP (1) JPH0271861A (en)
AT (1) ATE93168T1 (en)
DE (2) DE3823739A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437383A1 (en) * 1990-01-12 1991-07-17 Regie Nationale Des Usines Renault S.A. Process and device for electrostatically spray-painting plastic articles
DE4227136C3 (en) * 1992-08-17 1998-08-13 Weitmann & Konrad Fa Method and device for moistening a printed and then thermally dried, moving material web, in particular paper web
DE19636234C5 (en) * 1996-09-06 2005-02-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method and device for the electrostatic coating of substrates
DE19950009B4 (en) * 1999-10-18 2012-11-22 Eltex-Elektrostatik Gmbh Device for moistening a material web
DE102008050899B4 (en) * 2008-09-25 2013-03-28 Gerhard Bach Device for moistening flexible flat material
US9186881B2 (en) 2009-03-09 2015-11-17 Illinois Tool Works Inc. Thermally isolated liquid supply for web moistening
US20100224123A1 (en) 2009-03-09 2010-09-09 Illinois Tool Works Inc. Modular nozzle unit for web moistening
CN102806161A (en) * 2011-05-30 2012-12-05 张家港市佳龙真空浸漆设备制造厂 Continuous electrostatic painting equipment for non-conductive coiled materials

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE813016C (en) * 1946-09-04 1951-09-06 Philips Nv Transport device for paper and similar materials
DE1162729B (en) * 1959-02-20 1964-02-06 Licentia Gmbh Electrostatic applicator spray device for tape-shaped goods
JPS5041144Y2 (en) * 1971-05-21 1975-11-22
JPS4846630A (en) * 1971-10-15 1973-07-03
DE2219994A1 (en) * 1972-04-24 1973-11-08 Voith Gmbh J M Electrostatic spraying of paper - with spray electrode at earth potential
US3910475A (en) * 1973-03-15 1975-10-07 Xerox Corp System for electrically grounding or biasing a member
JPS5950797B2 (en) * 1978-05-29 1984-12-10 神崎製紙株式会社 How to humidify paper
DE2841395A1 (en) * 1978-09-22 1980-03-27 Brueckner Trockentechnik Kg Electrostatic spraying equipment for moving web - has high voltage sloping grid with cleaning roller and heating plate
IT1163609B (en) * 1983-06-28 1987-04-08 Pecis Luigi & Co Pcm APPARATUS FOR THE APPLICATION OF LIQUID SUBSTANCES ON SLABS, SUCH AS FABRICS, LEATHER AND SIMILAR
JPH0673643B2 (en) * 1986-02-10 1994-09-21 ノードソン株式会社 Electrostatic coating method and apparatus for powder on non-conductive and void-containing coating object

Also Published As

Publication number Publication date
DE58905308D1 (en) 1993-09-23
DE3823739A1 (en) 1990-01-18
ATE93168T1 (en) 1993-09-15
JPH0271861A (en) 1990-03-12
EP0350606A3 (en) 1990-10-24
EP0350606A2 (en) 1990-01-17

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