EP1072406B1 - Electrostatic printing aid - Google Patents

Electrostatic printing aid Download PDF

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Publication number
EP1072406B1
EP1072406B1 EP00109262A EP00109262A EP1072406B1 EP 1072406 B1 EP1072406 B1 EP 1072406B1 EP 00109262 A EP00109262 A EP 00109262A EP 00109262 A EP00109262 A EP 00109262A EP 1072406 B1 EP1072406 B1 EP 1072406B1
Authority
EP
European Patent Office
Prior art keywords
voltage
printing
assist device
voltage generator
current
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
EP00109262A
Other languages
German (de)
French (fr)
Other versions
EP1072406A1 (en
Inventor
Franz Knopf
Thomas Ludwig
Ernst August Hahne
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
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Filing date
Publication date
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Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP1072406A1 publication Critical patent/EP1072406A1/en
Application granted granted Critical
Publication of EP1072406B1 publication Critical patent/EP1072406B1/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
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • the invention relates to an electrostatic Print Help.
  • Electrostatic printing aids to support the Transitions from printing inks are in a variety of ways Embodiments known. Be such printing aids used in printing inks, which is a flammable Solvent are to avoid Fires and explosions to take measures that an ignition of the resulting mixture of Prevent solvent with air. In such a explosive environment is subject to the Electrostatic printing assistance special Safety precautions.
  • a well-known generic, so-called intrinsically safe electrostatic printing aid (US-PS 4,360,850) according to the preamble of claim 1 achieves the required safety through the Monitoring the ohmic conductivity of one of the High voltage generator connected impedance. If this conductivity exceeds a given value Limit, the output voltage of the High voltage generator turned off and thus his Output line limited to zero. It means that for safety in potentially explosive areas a consumer connected to the generator a predetermined minimum resistance not may fall below.
  • the invention is therefore based on the object an electrostatic printing aid according to the Generic term of main claim for use in a potentially explosive environment easier in To design training and more effectively in the company, without this would endanger the security and without security and functionality of the in wide ranges scattering electrical Conductivity of the connected to the printing aid Depend on the consumer.
  • the Voltage transfer device as simple as possible can be configured, for example as Slip ring brush, as a contact roller or spring or electrically conductive ball bearings, without that in the hazardous area guided electric Charge, e.g. in the form of electrical sparks regardless of the ohmic conductivity of the Coating of the impression roller an ignition of solvent-containing air allows. So it has to be unlike the prior art not complicated and elaborately encapsulated Voltage transfer devices be present. Rather, all are direct Charge transfer devices possible, as they Prior art so far outside the Hazardous area already in use Find. Also, none are the functionality impairing restrictions on the electrical conductivity of a connected Consumer.
  • the high voltage generator with adjustable or not adjustable, but in any case maximum electrical output power points in this case expedient embodiment a voltage limitation for the maximum voltage and / or one Current limit for the maximum current.
  • a voltage limitation for the maximum voltage and / or one Current limit for the maximum current are particularly expedient embodiment.
  • the Safety is given even if one or two independent errors in the Voltage limiting device and / or the Current limiting device should occur.
  • the high voltage generator 3 has a Voltage device 33 for generating a adjustable high voltage on, at one Connection connected in series three Current limiting devices 34 are arranged. Behind this series circuit of Current limiting devices 34 is the Parallel connection of three voltage limiters 35 for the total of 36 designated high voltage to the electrical output terminals 31, 32 of the High voltage device 3 is provided. With this each triple redundant wiring is the Output power of the high voltage 36 to a Maximum value limited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Dc-Dc Converters (AREA)
  • Measuring Fluid Pressure (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Glass Compositions (AREA)

Abstract

The printing aid is designed, so that the high voltage generator (3) is provided with an adjustable limiting unit for its output power and that the voltage transmitting unit (2) has slip rings, brushes, contact rollers or springs and/or electric conducting roller or ball bearings.

Description

Die Erfindung betrifft eine elektrostatische Druckhilfe.The invention relates to an electrostatic Print Help.

Elektrostatische Druckhilfen zur Unterstützung des Übergangs von Druckfarbe sind in einer Vielzahl von Ausführungsformen bekannt. Werden solche Druckhilfen bei Druckfarben verwendet, die ein brennbares Lösungsmittel aufweisen, sind zur Vermeidung von Bränden und Explosionen Massnahmen zu treffen, die eine Zündung des entstehenden Gemisches des Lösungsmittels mit Luft verhindern. In einer solchen explosionsgefährdeten Umgebung unterliegt die elektrostatische Druckhilfe besonderen Sicherheitsvorkehrungen.Electrostatic printing aids to support the Transitions from printing inks are in a variety of ways Embodiments known. Be such printing aids used in printing inks, which is a flammable Solvent are to avoid Fires and explosions to take measures that an ignition of the resulting mixture of Prevent solvent with air. In such a explosive environment is subject to the Electrostatic printing assistance special Safety precautions.

Die Spannungsübertragung erfolgt mit bekannten elektrostatischen Druckhilfen über normale Spannungsübertragungseinrichtungen wie Corona-Elektroden und Rotationstransformatoren. Die Sicherheitsanforderungen für den Betrieb solcher Spannungsübertragungseinrichtungen in explosionsgefährdeter Umgebung erfordern aufwendigere und kompliziertere Konstruktionen dieser Spannungsübertragungseinrichtungen.The voltage transmission takes place with known electrostatic printing aids over normal Voltage transmission devices such as Corona electrodes and rotary transformers. The Safety requirements for the operation of such Voltage transmission devices in Explosive environments require more complex and more complicated constructions of this Voltage transmission facilities.

Eine weitere bekannte Ausführung sieht die Kapselung der Spannungsübertragungseinrichtung mittels einer Druckluftschleuse vor (US-PS 4,966,555), was ebenfalls zu einer komplizierten Konstruktion und einem aufwendigen Betrieb führt.Another known embodiment sees the encapsulation the voltage transmission device by means of a Compressed air lock before (US-PS 4,966,555), what likewise to a complicated construction and leads to a complex operation.

Eine bekannte gattungsgemäße , sogenannte eigensichere elektrostatische Druckhilfe (US-PS 4,360,850) gemäß dem Oberbegriff des Anspruchs 1 erreicht die erforderliche Sicherheit durch die Überwachung der ohmschen Leitfähigkeit einer an den Hochspannungsgenerator angeschlossenen Impedanz. Überschreitet diese Leitfähigkeit einen vorgegebenen Grenzwert, wird die Ausgangsspannung des Hochspannungsgenerators abgeschaltet und damit seine Ausgangsleitung auf Null begrenzt. Das bedeutet, dass für die Sicherheit im explosionsgefährdeten Bereich ein an den Generator angeschlossener Verbraucher einen vorgegebenen minimalen Widerstandswert nicht unterschreiten darf.A well-known generic, so-called intrinsically safe electrostatic printing aid (US-PS 4,360,850) according to the preamble of claim 1 achieves the required safety through the Monitoring the ohmic conductivity of one of the High voltage generator connected impedance. If this conductivity exceeds a given value Limit, the output voltage of the High voltage generator turned off and thus his Output line limited to zero. It means that for safety in potentially explosive areas a consumer connected to the generator a predetermined minimum resistance not may fall below.

Bei dem Verbraucher der elektrostatischen Druckhilfe handelt es sich um eine mit einem elektrisch leitfähig beschichteten Belag versehene Walze, den sogenannten Presseur. Die Leitfähigkeit der Beschichtung ist damit entscheidend für die sichere Funktion des bekannten Generators. Es hat sich aber gezeigt, dass sich die elektrische Leitfähigkeit solcher Walzenbeschichtungen bei der Herstellung nur mit grossen Toleranzen einstellen lässt. Dazu kommt eine hohe Temperatur- und Alterungsabhängigkeit dieser Leitfähigkeit.At the consumer of the electrostatic printing aid it is one with an electric one conductive coated covering roller, the so-called impressionur. The conductivity of the Coating is therefore crucial for the safe Function of the known generator. It has become though shown that the electrical conductivity such roller coatings in the production only can be adjusted with large tolerances. In addition comes a high temperature and aging dependence this conductivity.

In der Praxis sind bei dem bekannten System für einen störungsfreien Betrieb daher Walzenbeschichtungen erforderlich, deren Leitfähigkeit um ein Vielfaches unter der sicherheitstechnisch erforderlichen Leitfähigkeitsgrenze liegt. Bei diesen geringen Leitfähigkeiten kann mit dem bekannten System häufig kein ausreichender Nutzeffekt mehr erreicht werden.In practice, in the known system for a trouble-free operation therefore roller coatings required, whose conductivity is many times under the safety required Conductivity limit is. At these low Conductances can be common with the known system no sufficient benefit can be achieved.

Der Erfindung liegt deshalb die Aufgabe zugrunde, eine elektrostatische Druckhilfe gemäss dem Oberbegriff des Hauptanspruchs für den Einsatz in einer explosionsgefährdeten Umgebung einfacher in Ausbildung und effektiver im Betrieb auszugestalten, ohne dass hierbei die Sicherheit gefährdet wäre und ohne dass Sicherheit und Funktionsfähigkeit von der in weiten Bereichen streuenden elektrischen Leitfähigkeit des an die Druckhilfe angeschlossenen Verbrauchers abhängen.The invention is therefore based on the object an electrostatic printing aid according to the Generic term of main claim for use in a potentially explosive environment easier in To design training and more effectively in the company, without this would endanger the security and without security and functionality of the in wide ranges scattering electrical Conductivity of the connected to the printing aid Depend on the consumer.

Diese Aufgabe wird erfindungsgemäss durch den Gegenstand des Hauptanspruchs gelöst.This object is achieved by the Subject of the main claim.

Es wird also nach Lehre der Erfindung ein Hochspannungsgenerator mit einer -unter der Zündenergie des Lösungsmittels liegenden- maximalen Ausgangsleistung bereitgestellt, so dass die Spannungsübertragungseinrichtung möglichst einfach ausgestaltet sein kann, beispielsweise als Schleifring-Bürste, als Kontaktrolle oder -feder oder elektrisch leitendes Kugellager, ohne dass die in den explosionsgefährdeten Bereich geführte elektrische Ladung, z.B. in Form von elektrischen Funken unabhängig von der ohmschen Leitfähigkeit der Beschichtung des Presseurs eine Zündung der lösungsmittelhaltigen Luft ermöglicht. Es müssen also im Gegensatz zum Stand der Technik nicht komplizierte und aufwendig gekapselte Spannungsübertragungseinrichtungen vorhanden sein. Vielmehr sind alle direkten Ladungsübertragungseinrichtungen möglich, wie sie als Stand der Technik bislang ausserhalb des explosionsgefährdeten Bereichs bereits Einsatz finden. Auch sind keine die Funktionsfähigkeit beeinträchtigenden Einschränkungen bezüglich der elektrischen Leitfähigkeit eines angeschlossenen Verbrauchers zu berücksichtigen. It is therefore according to the teaching of the invention High voltage generator with a -unter der Ignition energy of the solvent lying maximum Output power provided so that the Voltage transfer device as simple as possible can be configured, for example as Slip ring brush, as a contact roller or spring or electrically conductive ball bearings, without that in the hazardous area guided electric Charge, e.g. in the form of electrical sparks regardless of the ohmic conductivity of the Coating of the impression roller an ignition of solvent-containing air allows. So it has to be unlike the prior art not complicated and elaborately encapsulated Voltage transfer devices be present. Rather, all are direct Charge transfer devices possible, as they Prior art so far outside the Hazardous area already in use Find. Also, none are the functionality impairing restrictions on the electrical conductivity of a connected Consumer.

Damit lassen sich Beschichtungen für den Presseur in einem wesentlich grösseren Leitfähigkeitsbereich verwenden, was der technischen Realität bei der Herstellung solcher Beschichtungen näherkommt und den Einsatz einer elektrostatischen Druckhilfe erweitert.This allows coatings for the impression roller in a much larger conductivity range use what the technical reality in the Production of such coatings is approaching and the Use of an electrostatic printing aid extended.

Der Hochspannungsgenerator mit einstellbarer oder nicht einstellbarer, in jedem Falle jedoch maximaler elektrischer Ausgangsleistung weist hierbei in zweckmässiger Ausgestaltung eine Spannungsbegrenzung für die maximale Spannung und/oder eine Strombegrenzung für den maximalen Strom auf. In besonders zweckmässiger Ausgestaltung sind Spannungs- und Strombegrenzung redundant ausgeführt, wobei die Sicherheit selbst dann gegeben ist, wenn ein oder zwei voneinander unabhängige Fehler in der Spannungsbegrenzungseinrichtung und/oder der Strombegrenzungseinrichtung auftreten sollten.The high voltage generator with adjustable or not adjustable, but in any case maximum electrical output power points in this case expedient embodiment a voltage limitation for the maximum voltage and / or one Current limit for the maximum current. In Particularly expedient embodiment are voltage and current limiting redundant, the Safety is given even if one or two independent errors in the Voltage limiting device and / or the Current limiting device should occur.

Weitere zweckmässige Ausgestaltungen und Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Further expedient embodiments and Further developments of the invention are in the Subclaims characterized.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend unter Bezugnahme auf die Zeichnung näher erläutert, die ein schematisches Schaltbild der Erfindung zeigt.An embodiment of the invention will in the following with reference to the drawing which illustrates a schematic diagram of the Invention shows.

Mit 3 ist ein Hochspannungsgenerator zur Erzeugung einer elektrostatischen Hochspannung gezeigt, der über seine Ausgangsanschlüsse 31, 32 an eine als elektrische Schleifbürste ausgebildete, insgesamt mit 2 bezeichnete Spannungsübertragungseinrichtung angeschlossen ist, die an der Welle 11 des mit 1 bezeichneten Presseur angreift. Der Presseur ist mit einer elektrisch leitfähigen Beschichtung 12 als Mantel versehen, die die elektrische Ladung an die zwischen Presseur und einem geerdetem Druckzylinder 4 befindliche zu bedruckende Bahn 5 leitet. Mit 100 ist der Bereich gekennzeichnet, der aufgrund der lösungsmittelhaltigen Lufte explosionsgefährdet ist.With 3 is a high voltage generator for generation an electrostatic high voltage shown, the via its output terminals 31, 32 to a as electric brush trained, with a total of 2 designated voltage transfer device connected to the shaft 11 of the 1 designated impressionist attacks. The impressionary is with an electrically conductive coating 12 as Mantle provided the electrical charge to the between impression roller and a grounded pressure cylinder. 4 located to be printed web 5 passes. With 100's the area marked due to the solvent-containing air is at risk of explosion.

Der Hochspannungsgenerator 3 weist eine Spannungseinrichtung 33 zur Erzeugung einer einstellbaren Hochspannung auf, an deren einen Anschluss hintereinander geschaltet drei Strombegrenzungseinrichtungen 34 angeordnet sind. Hinter dieser Serienschaltung von Strombegrenzungseinrichtungen 34 ist die Parallelschaltung von drei Spannungsbegrenzern 35 für die insgesamt mit 36 bezeichnete Hochspannung an den elektrischen Ausgangsanschlüssen 31, 32 der Hochspannungseinrichtung 3 vorgesehen. Mit dieser jeweils dreifach redundanten Beschaltung wird die Ausgangsleistung der Hochspannung 36 auf einen Maximalwert begrenzt.The high voltage generator 3 has a Voltage device 33 for generating a adjustable high voltage on, at one Connection connected in series three Current limiting devices 34 are arranged. Behind this series circuit of Current limiting devices 34 is the Parallel connection of three voltage limiters 35 for the total of 36 designated high voltage to the electrical output terminals 31, 32 of the High voltage device 3 is provided. With this each triple redundant wiring is the Output power of the high voltage 36 to a Maximum value limited.

Somit ist sichergestellt, dass die in den explosionsgefährdeten Bereich geführte elektrische Ladung unabhängig von der ohmschen Leitfähigkeit der Beschichtung des Presseurs eine Zündung der lösungsmittelhaltigen Luft nicht ermöglicht.Thus, it is ensured that in the hazardous area guided electric Charge independent of the ohmic conductivity of the Coating of the impression roller an ignition of solvent-containing air is not possible.

Claims (7)

  1. Electrostatic printing-assist device for assisting the transfer of printing ink containing flammable solvents when printing with a high-voltage generator (3), which provides an electrostatic high voltage (36) at its output connections (31, 32), and with a voltage-transfer device (2) for the transfer of the high voltage (36) to an impression roller (1) or plate, which comes into contact with the web to be printed, wherein the high-voltage generator (3) is provided with an adjustable limiting device for its output power, characterised in that the high-voltage generator (3) is adjusted for a maximum output power of the limiting device, which differs from zero, but which is not sufficient for the ignition of the solvent-containing air, and that the voltage-transfer device (2) provides slip-rings, slip-ring brushes, contact rollers, contact springs and/or electrically conductive roller bearings or ball bearings.
  2. Printing-assist device according to claim 1, characterised in that the maximum electrical energy of the output power does not exceed 350 mJ.
  3. Printing-assist device according to claim 1 or 2, characterised in that the high-voltage generator (3) provides one or more voltage limiters (35) connected in parallel to the output connections (31, 32) for the electrostatic high voltage (36), preferably for up to 3000 V, and/or one or more current-limiting devices (34) connected in series to the output connections (31, 32), preferably for up to 12 mA.
  4. Printing-assist device according to claim 3, characterised in that the at least one voltage limiter (35) for the electrostatic high voltage (36) is designed for up to 3000 V.
  5. Printing-assist device according to claim 3, characterised in that the at least one current limiting device (34) is designed for a current up to 12mA.
  6. Printing-assist device according to any one of claims 1 to 4, characterised in that the voltage generator (3) provides another adjustable voltage-limiting device, independent of the voltage limiting device (35) relevant with regard to safety regulations.
  7. Printing-assist device according to any one of claims 1 to 3 and 5, characterised in that the high-voltage generator (3) provides another current limiter independent of the current-limiting device (34) relevant with regard to safety regulations.
EP00109262A 1999-07-29 2000-04-28 Electrostatic printing aid Revoked EP1072406B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19935784 1999-07-29
DE19935784A DE19935784A1 (en) 1999-07-29 1999-07-29 Electrostatic printing aid

Publications (2)

Publication Number Publication Date
EP1072406A1 EP1072406A1 (en) 2001-01-31
EP1072406B1 true EP1072406B1 (en) 2005-07-13

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ID=7916568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00109262A Revoked EP1072406B1 (en) 1999-07-29 2000-04-28 Electrostatic printing aid

Country Status (8)

Country Link
US (1) US6508174B1 (en)
EP (1) EP1072406B1 (en)
JP (1) JP2001038947A (en)
AT (1) ATE299437T1 (en)
DE (2) DE19935784A1 (en)
DK (1) DK1072406T3 (en)
ES (1) ES2244376T3 (en)
PT (1) PT1072406E (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005016974U1 (en) * 2005-10-25 2006-01-05 Dettke, Christa impression roller
DE102008006269B3 (en) * 2008-01-25 2009-05-14 Eltex-Elektrostatik Gmbh Impression roller and its use
US20110224930A1 (en) * 2010-03-10 2011-09-15 Total Manufacturing Co. System and method for detection of insect infestation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477369A (en) * 1967-05-04 1969-11-11 Hurletron Inc Electrostatically assisted intaglio printing
US3641971A (en) * 1967-09-01 1972-02-15 Arvid C Walberg Apparatus for preventing arcing in an electrostatic coating system
US3875892A (en) * 1974-01-14 1975-04-08 Ransburg Corp Apparatus for avoiding sparks in an electrostatic coating system
US4360850A (en) * 1979-10-30 1982-11-23 Hurletronaltair, Inc. Intrinsically safe electrostatic assist units
NL8320067A (en) * 1983-02-07 1985-01-02 Gravure Res Inst IMPROVED METHOD AND APPARATUS FOR DIRECTLY CHARGING THE SURFACE OF A PRESSURE ROLLER FROM ELECTROSTATIC AID ENGRAVERS.
US4966555A (en) * 1989-04-24 1990-10-30 Rotation Dynamics Corporation Electrostatic assist rotogravure printing safety contact
US5243487A (en) * 1990-12-20 1993-09-07 Hurletron Incorporated Gravure press with crowbar circuit

Also Published As

Publication number Publication date
US6508174B1 (en) 2003-01-21
DE19935784A1 (en) 2001-02-01
PT1072406E (en) 2005-09-30
DE50010696D1 (en) 2005-08-18
DK1072406T3 (en) 2005-11-07
ES2244376T3 (en) 2005-12-16
JP2001038947A (en) 2001-02-13
ATE299437T1 (en) 2005-07-15
EP1072406A1 (en) 2001-01-31

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