EP1233834B1 - Device for humidifying a material web - Google Patents

Device for humidifying a material web Download PDF

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Publication number
EP1233834B1
EP1233834B1 EP00935208A EP00935208A EP1233834B1 EP 1233834 B1 EP1233834 B1 EP 1233834B1 EP 00935208 A EP00935208 A EP 00935208A EP 00935208 A EP00935208 A EP 00935208A EP 1233834 B1 EP1233834 B1 EP 1233834B1
Authority
EP
European Patent Office
Prior art keywords
material web
diverting roller
spraying
water
diverting
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.)
Revoked
Application number
EP00935208A
Other languages
German (de)
French (fr)
Other versions
EP1233834A1 (en
Inventor
Ernst August Hahne
Franz Knopf
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7925950&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1233834(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP1233834A1 publication Critical patent/EP1233834A1/en
Application granted granted Critical
Publication of EP1233834B1 publication Critical patent/EP1233834B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/02—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by dampening
    • 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 for Moisten a moving in the direction of transport Material web according to the preamble of Main claim.
  • the invention has for its object a Generic device according to the preamble of Main claim to develop so that at the slightest Installation dimensions to achieve the highest level of humidification.
  • the material web - in the transport direction - is electrostatically charged in front of the spraying device (surprisingly higher in the area outside the deflection roller than in the area of the corona electrode) and then the material web thus charged the sprayed-on water mist due to the electric field due to the Charging influences, whereby the water particles of the spray are surprisingly literally sucked up by the material web, ie the water aerosols charged in the opposite direction to the paper penetrate into the material, and surprisingly the amount of water applied of about 2.5 g / m 2 does not result in any formation of Surface water has led to the material web.
  • the moistening profile of the water spray heads has not mapped onto the material web, which in turn may be due to the dominance of the high and uniform distribution of the field strength in the form of a homogeneous field.
  • an efficiency of greater than 95%, and in some cases also 98%, has been achieved.
  • significantly fewer components are required, which is directly related to the space required for such a device for rewetting.
  • the latter has the particular advantage of being able to retrofit existing printing systems in a simple manner.
  • the total of 4 designated material web is in Transport direction v by a total of 3 designated deflection roller (in the reproduced Embodiment) by a wrap angle of 90 ° around.
  • the deflection roller 3 is a grounded drum, the one smooth, electrically conductive surface that is preferably high-gloss chrome-plated. It has have shown that in this training the Charging electrode the web of material on your physically maximum field strength is charged, so that the electric field E designated 5 results.
  • the material web 4 is then in the area of two each other on different sides of the material web 4 grounded opposite each other Water spray heads 6 passed through one overall schematically designated 7 spray cone form.
  • a total of 8 designated Field force F which they literally inside the Push material web 4 in.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

A device for moistening a material web moved in the transport direction, is preferably used for re-moistening a paper or textile web dried after printing by means of spray device for spraying a water fog onto the material web under the influence of an electrostatic field produced by a device for electrostatic charging. The device includes a reversing roller provided in the transport direction upstream of the spray device for deflecting the material web. The reversing roller has associated with it a device designed as a corona-charging electrode for electrostatic charging and the spray device has two water spray heads located on both sides of the material web.

Description

Die Erfindung betrifft eine Vorrichtung zum Befeuchten einer in Transportrichtung bewegten Materialbahn gemäß dem Oberbegriff des Hauptanspruchs.The invention relates to a device for Moisten a moving in the direction of transport Material web according to the preamble of Main claim.

Vorrichtungen zum Wiederbefeuchten sind an sich bekannt (EP-0 350 606 A2). Sie haben sich in der Praxis bewährt. Von Nachteil ist jedoch, daß diese bekannten Anlagen sich meistens nur schwer bei vorhandenen Anlagen nachrüsten lassen. Schließlich kann mit diesen bekannten Vorrichtung nur ein mäßiger Wiederbefeuchtungsgrad erzielt werden.Devices for rewetting are in themselves known (EP-0 350 606 A2). You have in the Proven in practice. The disadvantage, however, is that this known systems are usually difficult to Have existing systems retrofitted. Finally can only a moderate with these known device Degree of rewetting can be achieved.

Vorrichtungen zum Wiederbefeuchten der gattungsgemäßen Art nach dem Oberbegriff des Hauptanspruchs sind bekannt (US 3,625,743). Sie weist eine Sprüheinrichtung mit zwei Wassersprühköpfe auf, die auf beiden Seiten der Materialbahn angeordnet sind, wobei in Transportrichtung vor der Sprüheinrichtung eine Umlenkwalze zum Umlenken der Materialbahn vorgesehen ist. Allerdings ist jeder Umlenkwalze eine Sprüheinrichtung zugeordnet. Von Nachteil ist auch hier, daß sich diese bekannten Vorrichtungen meistens nur schwer bei vorhandenen Anlagen nachrüsten lassen. Ebenso kann mit diesen bekannten Vorrichtung nur ein mäßiger Wiederbefeuchtungsgrad erzielt werden.Devices for rewetting the Generic type according to the preamble of Main claims are known (US 3,625,743). she has a spray device with two water spray heads on that on both sides of the web are arranged, being in the transport direction in front of the Spraying device a deflection roller for deflecting the Material web is provided. However, everyone is Deflection roller assigned a spray device. Of The disadvantage here is that these are known Devices mostly difficult with existing ones Have systems retrofitted. Likewise, with these known device only a moderate Degree of rewetting can be achieved.

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung nach dem Oberbegriff des Hauptanspruchs so weiterzubilden, daß bei geringsten Einbaumaßen ein Höchstmaß an Befeuchtung zu erzielen ist. The invention has for its object a Generic device according to the preamble of Main claim to develop so that at the slightest Installation dimensions to achieve the highest level of humidification.

Diese Aufgabe wird bei einer gattungsgemäßen Vorrichtung nach dem Oberbegriff des Hauptanspruchs erfindungsgemäß durch dessen kennzeichnende Merkmale gelöst.This task is done with a generic Device according to the preamble of the main claim according to the invention by its characteristic features solved.

Wesentlich für das erfindungsgemäße Prinzip ist hierbei, daß die Materialbahn - in Transportrichtung - vor der Sprüheinrichtung elektrostatisch aufgeladen (erstaunlicherweise im Bereich außerhalb der Umlenkwalze höher als im Bereich der Koronaelektrode) wird und dann die so aufgeladene Materialbahn den aufgesprühten Wassernebel infolge des elektrischen Feldes aufgrund der Aufladung influenziert, wodurch die Wasserteilchen des Sprühnebels überraschenderweise förmlich von der Materialbahn aufgesaugt werden, d.h. es dringen die relativ zum Papier entgegengesetzt aufgeladenen Wasseraerosole in das Material ein, wobei erstaunlicherweise auch die applizierte Wassermenge von etwa 2,5 g/m2 zu keinerlei Bildung von Oberflächenwasser auf der Materialbahn geführt hat. Auch hat sich das Befeuchtungsprofil der Wassersprühköpfe nicht auf die Materialbahn abgebildet, was wiederum auf die Dominanz der hohen und gleichmäßigen Verteilung der Feldstärke in Form eines homogenen Feldes zurückzuführen sein dürfte. Mit dieser erfindungsgemäßen Ausbildung hat man einen Wirkungsgrad von größer 95 %, zum Teil auch 98 % erreicht. Gegenüber den bekannten Vorrichtungen besteht überdies der Vorteil, daß deutlich weniger Komponenten benötigt werden, was in direktem Zusammenhang mit dem damit verbundenen Platzbedarf einer solchen Vorrichtung zum Wiederbefeuchten steht. Letzteres hat insbesondere den Vorteil, bestehende Druckanlagen in einfacher Weise nachrüsten zu können.It is essential for the principle according to the invention that the material web - in the transport direction - is electrostatically charged in front of the spraying device (surprisingly higher in the area outside the deflection roller than in the area of the corona electrode) and then the material web thus charged the sprayed-on water mist due to the electric field due to the Charging influences, whereby the water particles of the spray are surprisingly literally sucked up by the material web, ie the water aerosols charged in the opposite direction to the paper penetrate into the material, and surprisingly the amount of water applied of about 2.5 g / m 2 does not result in any formation of Surface water has led to the material web. Also, the moistening profile of the water spray heads has not mapped onto the material web, which in turn may be due to the dominance of the high and uniform distribution of the field strength in the form of a homogeneous field. With this design according to the invention, an efficiency of greater than 95%, and in some cases also 98%, has been achieved. Compared to the known devices, there is also the advantage that significantly fewer components are required, which is directly related to the space required for such a device for rewetting. The latter has the particular advantage of being able to retrofit existing printing systems in a simple manner.

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

Ein bevorzugtes Ausführungsbeispiel der Erfindung wird unter Bezugnahme auf die Zeichnung näher erläutert, die ein schematisches Funktionbild durch die erfindungsgemäße Vorrichtung darstellt.A preferred embodiment of the invention will be closer with reference to the drawing explained by a schematic function diagram represents the device according to the invention.

Die insgesamt mit 4 bezeichnete Materialbahn wird in Transportrichtung v um eine insgesamt mit 3 bezeichnete Umlenkwalze (beim wiedergegebenen Ausführungsbeispiel) um einen Umschlingungswinkel von 90° herumgeführt.The total of 4 designated material web is in Transport direction v by a total of 3 designated deflection roller (in the reproduced Embodiment) by a wrap angle of 90 ° around.

In Verlängerung des (im schematischen Querschnitt) durch den Tangentenpunkt hindurchgehenden Durchmessers ist die insgesamt mit 1 bezeichnete Einrichtung zum elektrostatischen Aufladen in Form einer Korona-Aufladeelektrode 1 gezeigt, wobei der Ladegleichstrom mit 2 bezeichnet ist, der auf die Oberfläche der Materialbahn 4 abfließt. Er beträgt ca. 2 mA/m. Als Tangentenlinie wird der Bereich der Materialbahn angesehen, der in Transportrichtung den Mantel der Umlenkwalze 3 berührt.In extension of (in schematic cross section) passing through the tangent point Diameter is the total designated 1 Forming device for electrostatic charging a corona charging electrode 1, the Charge DC is designated 2, which on the Surface of the material web 4 flows off. He is approx. 2 mA / m. The area of the Material web viewed in the direction of transport Jacket of the deflection roller 3 touches.

Die Umlenkwalze 3 ist eine geerdete Trommel, die eine glatte, elektrisch leitende Oberfläche, die vorzugsweise hochglanzverchromt ist, aufweist. Es hat sich gezeigt, daß bei dieser Ausbildung der Aufladeelektrode die Materialbahn auf ihre physikalisch maximale Feldstärke aufgeladen wird, so daß sich das mit 5 bezeichnete elektrische Feld E ergibt. The deflection roller 3 is a grounded drum, the one smooth, electrically conductive surface that is preferably high-gloss chrome-plated. It has have shown that in this training the Charging electrode the web of material on your physically maximum field strength is charged, so that the electric field E designated 5 results.

Die Materialbahn 4 wird dann in dem Bereich zweier einander auf verschiedenen Seiten der Materialbahn 4 einander gegenüberliegend angeordnete, geerdete Wassersprühköpfe 6 hindurchgeführt, die einen insgesamt schematisch mit 7 bezeichneten Sprühkegel bilden. Infolge der Influenz wirkt auf die Wasseraerosole eine insgesamt mit 8 bezeichnete Feldkraft F ein, die sie förmlich in das Innere der Materialbahn 4 hineindrückt.The material web 4 is then in the area of two each other on different sides of the material web 4 grounded opposite each other Water spray heads 6 passed through one overall schematically designated 7 spray cone form. As a result of the influence on the Water aerosols a total of 8 designated Field force F, which they literally inside the Push material web 4 in.

Es ist auch möglich, anstelle der Erdung die umgekehrte Polarität bei der Umlenkwalze 3 und den Wassersprühköpfen 6 einzusetzen. Auch ist es möglich, daß man auf der Oberseite der Umlenkwalze 3 eine Beschichtung aus Polytetrafluorethylen oder Risilan vornimmt, um zu verhindern, daß sich auf der Oberfläche der Walze Rückstände der Druckfarbe von der Materialbahn 4 absetzen.It is also possible to replace the earthing reverse polarity in the deflection roller 3 and Use water spray heads 6. It is also possible that one on the top of the guide roller 3 Coating made of polytetrafluoroethylene or Risilan to prevent that on the Surface of the roller residues of the printing ink deposit the material web 4.

Mit dieser erfindungsgemäßen Ausbildung hat man einen Wirkungsgrad von größer 95 %, zum Teil auch 98 % erreicht. Gegenüber den bekannten Vorrichtungen besteht überdies der Vorteil, daß deutlich weniger Komponenten benötigt werden, was in direktem Zusammenhang mit dem damit verbundenen Platzbedarf einer solchen Vorrichtung zum Wiederbefeuchten steht. Letzteres hat insbesondere den Vorteil, bestehende Druckanlagen in einfacher Weise nachrüsten zu können.With this training according to the invention you have one Efficiency greater than 95%, sometimes also 98% reached. Compared to the known devices there is also the advantage that significantly less Components are needed, what in direct Connection with the associated space requirement of such a device for rewetting. The latter has the particular advantage of existing Retrofitting printing systems in a simple manner.

Claims (9)

  1. Device for humidifying a material web (4) moving in a conveyor device (v), preferably for re-humidifying a paper or textile web which has dried after printing, by means of a spraying device (6) for spraying a water mist onto the material web (4) under the influence of an electrostatic field, which is produced by an electrostatic charging device (1), wherein the spraying device provides two water-spraying heads (6), which are arranged on both sides of the material web, and wherein a diverting roller (3) for diverting the material web (4) is provided in the conveyor device (v), characterised in that, an electrostatic charging device designed as a corona-charging electrode (1) is allocated to the diverting roller (3).
  2. Device according to claim 1, characterised in that the diverting roller (3) provides a smooth, electrically conductive surface.
  3. Device according to claim 2, characterised in that the diverting roller (3) is high-gloss chrome-plated.
  4. Device according to claim 2 or 3, characterised in that the diverting roller (3) is earthed.
  5. Device according to any one of claims 1 to 4, characterised in that the casing of the diverting roller (3) provides a thin coating, preferably polytetrafluorethylene or Rilsan over the smooth surface.
  6. Device according to any one of claims 1 to 5, characterised in that the diverting roller (3) wraps the material web (4) in an angled region which forms at least a right angle.
  7. Device according to any one of claims 1 to 6, characterised in that the corona-charging electrode (1) is arranged in the plane extending from the axis of the diverting roller (3) and the tangential line in the region in which the material web (4) runs onto the casing of the diverting roller (3).
  8. Device according to any one of claims 1 to 7, characterised in that the water-spraying heads (6) directed onto the surface of the material web (4) are earthed.
  9. Device according to claim 8, characterised in that the two water-spraying heads (6) are arranged facing one another on the two sides of the material web (4).
EP00935208A 1999-10-18 2000-06-14 Device for humidifying a material web Revoked EP1233834B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19950009 1999-10-18
DE19950009A DE19950009B4 (en) 1999-10-18 1999-10-18 Device for moistening a material web
PCT/EP2000/005478 WO2001028693A1 (en) 1999-10-18 2000-06-14 Device for humidifying a material web

Publications (2)

Publication Number Publication Date
EP1233834A1 EP1233834A1 (en) 2002-08-28
EP1233834B1 true EP1233834B1 (en) 2003-08-27

Family

ID=7925950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00935208A Revoked EP1233834B1 (en) 1999-10-18 2000-06-14 Device for humidifying a material web

Country Status (7)

Country Link
US (1) US6827781B1 (en)
EP (1) EP1233834B1 (en)
JP (1) JP2003512156A (en)
AT (1) ATE248027T1 (en)
DE (2) DE19950009B4 (en)
ES (1) ES2206241T3 (en)
WO (1) WO2001028693A1 (en)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP1772933A1 (en) * 2005-10-06 2007-04-11 Eltex-Elektrostatik GmbH High voltage electrode arrangement
DE102009041375A1 (en) 2009-09-12 2011-03-31 Steinemann Technology Ag Method for coating a carrier material with a web-shaped coating material, comprises adhering the carrier material with the coating material under application of compressive forces and heating in a laminating gap of a laminating unit

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DE10352978A1 (en) * 2003-11-13 2005-06-09 Ahlbrandt System Gmbh A method for coating a continuous band of material by application of an aerosol spray has an additional alternating current electrode creating a corona discharge
EP2222473B1 (en) 2007-02-22 2011-11-09 Goss Contiweb B.V. Device for moistening a paper web, corresponding rotary printing press and moistening method
EP1975101B1 (en) * 2007-03-28 2012-05-16 Heidelberger Druckmaschinen Aktiengesellschaft Transfer film sheet winding
US20100224123A1 (en) * 2009-03-09 2010-09-09 Illinois Tool Works Inc. Modular nozzle unit for web moistening
US20100224122A1 (en) * 2009-03-09 2010-09-09 Illinois Tool Works Inc. Low pressure regulation for web moistening systems
US9186881B2 (en) 2009-03-09 2015-11-17 Illinois Tool Works Inc. Thermally isolated liquid supply for web moistening
US20100224703A1 (en) * 2009-03-09 2010-09-09 Illinois Tool Works Inc. Pneumatic Atomization Nozzle for Web Moistening
DE102018211079A1 (en) * 2018-07-05 2020-01-09 Heidelberger Druckmaschinen Ag Sheet printing machine with a dampening device
CN109703187B (en) * 2018-09-12 2023-10-03 湖南飞优特电子科技有限公司 Silk screen static electricity removing device and use method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1772933A1 (en) * 2005-10-06 2007-04-11 Eltex-Elektrostatik GmbH High voltage electrode arrangement
DE102005048002B4 (en) * 2005-10-06 2010-03-25 Eltex-Elektrostatik Gmbh High-voltage electrode arrangement
DE102009041375A1 (en) 2009-09-12 2011-03-31 Steinemann Technology Ag Method for coating a carrier material with a web-shaped coating material, comprises adhering the carrier material with the coating material under application of compressive forces and heating in a laminating gap of a laminating unit

Also Published As

Publication number Publication date
DE19950009B4 (en) 2012-11-22
US6827781B1 (en) 2004-12-07
WO2001028693A1 (en) 2001-04-26
JP2003512156A (en) 2003-04-02
DE19950009A1 (en) 2001-04-26
EP1233834A1 (en) 2002-08-28
ES2206241T3 (en) 2004-05-16
ATE248027T1 (en) 2003-09-15
DE50003482D1 (en) 2003-10-02

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