EP1233834A1 - Device for humidifying a material web - Google Patents

Device for humidifying a material web

Info

Publication number
EP1233834A1
EP1233834A1 EP00935208A EP00935208A EP1233834A1 EP 1233834 A1 EP1233834 A1 EP 1233834A1 EP 00935208 A EP00935208 A EP 00935208A EP 00935208 A EP00935208 A EP 00935208A EP 1233834 A1 EP1233834 A1 EP 1233834A1
Authority
EP
European Patent Office
Prior art keywords
material web
deflecting roller
moistening
roller
deflecting
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.)
Granted
Application number
EP00935208A
Other languages
German (de)
French (fr)
Other versions
EP1233834B1 (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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7925950&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1233834(A1) "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

Links

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 moistening a material web moving in the transport direction, preferably for re-moistening a paper or textile web dried after printing by means of a spray device for spraying a water mist onto the material web under the action of an electrostatic field which is generated by a device for electrostatic charging , according to the preamble of the main claim.
  • the invention has for its object to develop a generic device according to the preamble of the main claim so that to achieve the highest level of humidification with the smallest installation dimensions. This object is achieved according to the invention in a generic device according to the preamble of the main claim by its characterizing features.
  • the material web - in the direction of transport - 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 water mist due to the electric field due to 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 way 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 been mapped to the material web, which in turn may be due to the dominance of the high and even 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 existing ones Retrofitting printing systems in a simple manner.
  • the material web denoted overall by 4 is guided in the transport direction v around a deflection roller denoted overall by 3 (in the exemplary embodiment shown) by a wrap angle of 90 °.
  • the device designated overall by 1 for electrostatic charging is shown in the form of a corona charging electrode 1, the charging direct current being designated 2, which flows onto the surface of the material web 4. It is approximately 2 mA / m.
  • the region of the material web that touches the jacket of the deflection roller 3 in the transport direction is regarded as the tangent line.
  • the deflection roller 3 is a grounded drum which has a smooth, electrically conductive surface, which is preferably high-gloss chrome-plated. It has been shown that with this configuration of the charging electrode, the material web is charged to its physically maximum field strength, so that the electric field E designated 5 results.
  • the material web 4 is then passed in the region of two grounded water spray heads 6 which are arranged opposite one another on different sides of the material web 4 and form a spray cone, which is schematically designated 7 overall.
  • a field force F which is denoted overall by 8, acts on the water aerosols and positively presses it into the interior of the material web 4.

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

VORRICHTUNG ZUM BEFEUCHTEN EINER MATERIALBAHN DEVICE FOR MOISTURIZING A MATERIAL RAIL
Die Erfindung betrifft eine Vorrichtung zum Befeuchten einer in Transportrichtung bewegten Materialbahn, vorzugsweise zum Wiederbefeuchten einer nach dem Bedrucken getrockneten Papier- oder Textilbahn mittels einer Sprüheinrichtung zum Aufsprühen eines Wassernebels auf die Materialbahn unter Einwirkung eines elektrostatischen Feldes, das von einer Einrichtung zum elektrostatischen Aufladen erzeugt wird, nach dem Oberbegriff des Hauptanspruchs .The invention relates to a device for moistening a material web moving in the transport direction, preferably for re-moistening a paper or textile web dried after printing by means of a spray device for spraying a water mist onto the material web under the action of an electrostatic field which is generated by a device for electrostatic charging , according to the preamble of the main claim.
Vorrichtungen zum Wiederbefeuchten dieser Art sind ansich 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 this type are known per se (EP-0 350 606 A2). They have proven themselves in practice. The disadvantage, however, is that these known systems are usually difficult to retrofit to existing systems. Finally, only a moderate degree of rewetting can be achieved with this known device.
Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Vorrichtung nach dem Oberbegriff des Haup anspruchs so weiterzubilden, daß bei geringsten Einbaumaßen ein Höchstmaß an Befeuchtung zu erzielen. Diese Aufgabe wird bei einer gattungsgemäßen Vorrichtung nach dem Oberbegriff des Hauptanspruchs erfindungsgemäß durch dessen kennzeichnende Merkmale gelöst .The invention has for its object to develop a generic device according to the preamble of the main claim so that to achieve the highest level of humidification with the smallest installation dimensions. This object is achieved according to the invention in a generic device according to the preamble of the main claim by its characterizing features.
Wesentlich für das erfindungsgemäße Prinzip ist hierbei, daß die Materialbahn - in Transportrichtung - vor der Sprüheinrichtung elektrostatisch aufgeladen (erstaunlicherweise im Bereich außerrhalb 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 direction of transport - 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 water mist due to the electric field due to 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 way 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 been mapped to the material web, which in turn may be due to the dominance of the high and even distribution of the field strength in the form of a homogeneous field. With this training 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 existing ones Retrofitting printing systems in a simple manner.
Zweckmäßige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet .Expedient refinements and developments of the 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 is explained in more detail with reference to the drawing, which represents a schematic functional diagram through 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 material web denoted overall by 4 is guided in the transport direction v around a deflection roller denoted overall by 3 (in the exemplary embodiment shown) by a wrap angle of 90 °.
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 an extension of the diameter (in schematic cross section) through the tangent point, the device designated overall by 1 for electrostatic charging is shown in the form of a corona charging electrode 1, the charging direct current being designated 2, which flows onto the surface of the material web 4. It is approximately 2 mA / m. The region of the material web that touches the jacket of the deflection roller 3 in the transport direction is regarded as the tangent line.
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 . 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 deflection roller 3 is a grounded drum which has a smooth, electrically conductive surface, which is preferably high-gloss chrome-plated. It has been shown that with this configuration of the charging electrode, the material web is charged to its physically maximum field strength, so that the electric field E designated 5 results. The material web 4 is then passed in the region of two grounded water spray heads 6 which are arranged opposite one another on different sides of the material web 4 and form a spray cone, which is schematically designated 7 overall. As a result of the influence, a field force F, which is denoted overall by 8, acts on the water aerosols and positively presses it into the interior of the material web 4.
Es ist zwar 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 use the reverse polarity in the deflection roller 3 and the water spray heads 6 instead of the grounding. It is also possible to apply a coating of polytetrafluoroethylene or Risilan on the upper side of the deflecting roller 3 in order to prevent residues of the printing ink from depositing on the material web 4 on the surface of the roller.
Mit dieser erfindungs emäßen 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, 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 easily retrofit existing printing systems.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Vorrichtung zum Befeuchten einer in Transportrichtung (v) bewegten Materialbahn (4) , vorzugsweise zum Wiederbefeuchten einer nach dem Bedrucken getrockneten Papier- oder Textilbahn, mittels einer Sprüheinrichtung (6) zum Aufsprühen eines Wassernebels auf die Materialbahn (4) unter Einwirkung eines elektrostatischen Feldes, das von einer Einrichtung zum elektrostatischen Aufladen (1) erzeugt wird,1. Device for moistening a material web (4) moving in the transport direction (v), preferably for re-moistening a paper or textile web dried after printing, by means of a spray device (6) for spraying a water mist onto the material web (4) under the action of an electrostatic Field generated by an electrostatic charging device (1),
d a d u r c h g e k e n n z e i c h n e t,characterized,
daß in Transportrichtung (v) vor der Sprüheinrichtung (6) eine Umlenkwalze (3) zum Umlenken der Materialbahn (4) vorgesehen ist,that a deflection roller (3) for deflecting the material web (4) is provided in the transport direction (v) upstream of the spray device (6),
daß der Umlenkwalze (3) eine als Koronaaufladeelektrode (1) ausgebildete Einrichtung zum elektrostatischen Aufladen zugeordnet ist,that the deflection roller (3) is assigned a device designed as a corona charging electrode (1) for electrostatic charging,
und daß die Sprüheinrichtung zwei Wassersprühköpfe (6) aufweist, die auf beiden Seiten der Materialbahn (4) angeordnet sind.and that the spray device has two water spray heads (6) which are arranged on both sides of the material web (4).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Umlenkwalze (3) eine glatte elektrisch gut leitende Oberfläche aufweist2. Device according to claim 1, characterized in that the deflecting roller (3) a smooth has an electrically highly conductive surface
3. Vorrichtung nach Anspruch 2 , dadurch gekennzeichnet, daß die Umlenkwalze (3) hochglanzverchromt ist .3. Apparatus according to claim 2, characterized in that the deflecting roller (3) is chrome-plated.
4. Vorrichtung nach Anspruch 2 oder 3 , dadurch gekennzeichnet, daß die Umlenkwalze (3) geerdet ist.4. Apparatus according to claim 2 or 3, characterized in that the deflecting roller (3) is grounded.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Mantel der Umlenkwalze (3) über der glatten Oberfläche eine dünne Beschichtung, vorzugsweise Polytetrafluor- ethylen oder Rilsan aufweist.5. Device according to one of claims 1 to 4, characterized in that the jacket of the deflecting roller (3) has a thin coating, preferably polytetrafluoroethylene or Rilsan, over the smooth surface.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Umlenkwalze (3) die Materialbahn (4) in einem Winkelbereich umschlingt, er wenigstens einen rechten Winkel bildet .6. Device according to one of claims 1 to 5, characterized in that the deflecting roller (3) wraps around the material web (4) in an angular range, it forms at least a right angle.
7. Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Koronaaufladeelektrode (1) in der von der Achse der Umlenkwalze (3) und der Tangentenlinie in dem Bereich, in dem die Materialbahn (4) auf den Mantel der Umlenkwalze (3) aufläuft, aufgespannten Ebene angeordnet ist. 7. Device according to one of claims 1 to 6, characterized in that the corona charging electrode (1) in the from the axis of the deflecting roller (3) and the tangent line in the area in which the material web (4) on the jacket of the deflecting roller ( 3) accumulates, spanned plane is arranged.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die auf die Oberfläche der Materialbahn (4) gerichteten Wassersprühköpfe (6) geerdet sind.8. Device according to one of claims 1 to 7, characterized in that the water spray heads (6) directed to the surface of the material web (4) are grounded.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die beiden Wassersprühköpfe (6) auf den beiden Seiten der Materialbahn (4) einander zugewandt zugeordnet sind. 9. The device according to claim 8, characterized in that the two water spray heads (6) on the two sides of the material web (4) are assigned to face each other.
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
DE19950009A DE19950009B4 (en) 1999-10-18 1999-10-18 Device for moistening a material web
DE19950009 1999-10-18
PCT/EP2000/005478 WO2001028693A1 (en) 1999-10-18 2000-06-14 Device for humidifying a material web

Publications (2)

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

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US9186881B2 (en) 2009-03-09 2015-11-17 Illinois Tool Works Inc. Thermally isolated liquid supply for web moistening

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Publication number Priority date Publication date Assignee Title
US8979004B2 (en) 2009-03-09 2015-03-17 Illinois Tool Works Inc. Pneumatic atomization nozzle for web moistening
US9186881B2 (en) 2009-03-09 2015-11-17 Illinois Tool Works Inc. Thermally isolated liquid supply for web moistening

Also Published As

Publication number Publication date
EP1233834B1 (en) 2003-08-27
DE50003482D1 (en) 2003-10-02
WO2001028693A1 (en) 2001-04-26
DE19950009A1 (en) 2001-04-26
ATE248027T1 (en) 2003-09-15
DE19950009B4 (en) 2012-11-22
ES2206241T3 (en) 2004-05-16
US6827781B1 (en) 2004-12-07
JP2003512156A (en) 2003-04-02

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