EP3575249A1 - Dispositif de déchargement de bandes en matière plastique ou d'autres bandes de matière sensiblement isolantes - Google Patents

Dispositif de déchargement de bandes en matière plastique ou d'autres bandes de matière sensiblement isolantes Download PDF

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Publication number
EP3575249A1
EP3575249A1 EP19174113.1A EP19174113A EP3575249A1 EP 3575249 A1 EP3575249 A1 EP 3575249A1 EP 19174113 A EP19174113 A EP 19174113A EP 3575249 A1 EP3575249 A1 EP 3575249A1
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EP
European Patent Office
Prior art keywords
electrode
high voltage
electrical
polarity
switching position
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
EP19174113.1A
Other languages
German (de)
English (en)
Other versions
EP3575249B1 (fr
EP3575249C0 (fr
Inventor
Christa Dettke
Hubertus Dettke
Christoph Dettke
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.)
DETTKE, CHRISTA
DETTKE, CHRISTOPH
DETTKE, HUBERTUS
Original Assignee
Individual
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Filing date
Publication date
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Publication of EP3575249A1 publication Critical patent/EP3575249A1/fr
Application granted granted Critical
Publication of EP3575249B1 publication Critical patent/EP3575249B1/fr
Publication of EP3575249C0 publication Critical patent/EP3575249C0/fr
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/513—Modifying electric properties
    • B65H2301/5133—Removing electrostatic charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/175—Plastic
    • B65H2701/1752—Polymer film
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge

Definitions

  • the invention relates to a device for unloading plastic film webs or other substantially insulating web materials.
  • web materials are wound into rolls directly after their production, their division into narrower webs, their printing or their further processing into bags, sacks or other packaging materials.
  • ESAs electrostatic pressure assistants
  • high electrostatic charges of the web materials may occur.
  • the charges are similarly stored in the web material wound into a roll, such as in a wound capacitor. As a result, it can come in particular during transport, storage or processing of roles to flashovers that endanger people.
  • Discharge devices are known with bar-shaped needle electrodes, which have two parallel rows of electrically conductive needles, which are directed to the continuous web material. A positive high voltage is applied to the needles of one row and a negative high voltage to the needles of the other row. As a result, an electric field builds up, which acts on the loaded foil material, so that it is discharged. Discharge devices work with high voltages from +/- 2 kV. The discharge high voltages are in particular in the range of +/- 5 to 15 kV, in particular +/- 10 kV.
  • electrostatic discharge devices with bar-shaped needle electrodes, which have only a single row of electrically conductive needles, which are directed to the continuous web material.
  • a high voltage of a certain polarity is applied to the tracks and ground potential is applied to the electrically conductive housing of the needle electrode.
  • An electric field builds up again between the needles and the housing, whereby the foil material is discharged.
  • Work is carried out with high voltages from + or - 2 kV, in particular + or - 5 to 15 kV, in particular + or - 10 kV.
  • a winding device is provided with means for transferring electrical charge to the web material on the take-up roll and / or deflecting it onto the take-up roll connected to at least one positive or negative polarity electrical high voltage source.
  • the device for transmitting electrical charges can be designed in particular as a needle electrode.
  • a disadvantage of the known discharge devices is that the electrodes must be replaced due to wear after a certain period of operation against new electrodes.
  • needle electrodes in particular, it can happen that they wear out to their point of emergence from an insulating potting compound. So the life of needle electrodes is often only half a year. After the service life has expired, they must be replaced.
  • the discharge is known by means of pulsed high voltages, wherein the potential applied to the electrodes is changed over and over again.
  • the wear of the electrodes is weakened.
  • due to the interrupted or fluctuating energy supply they are less effective.
  • the object of the invention is to provide a device for unloading plastic film webs or other substantially insulating web materials with increased service lives of the electrodes and without sacrificing efficiency.
  • the high voltage of positive polarity can be alternately applied to the first electrode and to the second electrode and, accordingly, the high voltage of negative polarity to the respective other electrode.
  • the high voltage of certain (positive or negative) polarity can be alternately applied to the first or second electrode and, accordingly, the ground potential to the other electrode.
  • the efficiency of the device according to the invention for discharging is greater.
  • the inventive Device greater range than devices with pulsed high voltages, especially since they can be operated at higher high voltages, so that the electrode assembly generates a stronger electric field. This is advantageous for applications in which the distance between the electrode and the web material varies, for example in the case of reel winders.
  • the device for unloading is advantageously used, in particular, in devices for producing or processing substantially insulating web materials.
  • the substantially insulating web materials are, in particular, plastic films or composite films containing plastic or sheet materials produced from plastic films or composite films.
  • Composite films may contain the plastic, for example, in the form of a plastic film, an extruded layer or applied plastic films. In addition, they include, for example, a metal foil, a paper web, a board web or another plastic film. In addition, the composite film may comprise any of the aforementioned components in combination.
  • the web material may in particular be a printing material.
  • the web material may in particular be a printed material printed in a printing press. This may in particular be a packaging material.
  • the electrical high voltage is at least +/- 2 kV.
  • the electrical high voltage is located in the range of +/- 5 to 15 kV.
  • the electrical high voltage is +/- 10 kV.
  • the electrical high voltage is at least + or - 2 kV.
  • the electrical high voltage is in the range of + or - 5 to 15 kV.
  • the electrical high voltage is + or - 10 kV.
  • the electrical high voltage provided for discharge from the high voltage source is mostly positive polarity because the web material is mostly negatively charged.
  • the web material is positively charged and the high voltage provided for discharge from the high voltage source has negative polarity.
  • the first electrode is designed as a needle electrode having at least one row of electrically conductive needles
  • the second electrode is designed as a needle electrode having at least one row of electrically conductive needles.
  • Needle electrodes are subject to a particularly strong wear. The service lives of needle electrodes are increased by the invention to a particularly great extent.
  • the needle electrode is formed as in the EP 1 640 160 B1 described, in particular as described in the embodiments of this document.
  • the electrode arrangement comprises two of these needle electrodes, which are arranged next to one another.
  • the first electrode and the second electrode are structurally combined to form a single needle electrode.
  • the electrode arrangement comprises a needle electrode, which differs from the exemplary embodiments of FIGS EP 1 640 160 B1 has at least two rows of electrically conductive needles, wherein a series of electrically conductive needles, the first electrode and another series of electrically conductive needles forms the second electrode.
  • the first electrode is designed as a needle electrode having at least one row of electrically conductive needles and the second electrode as an electrically conductive housing of the needle electrode or as a knife, spiral, brush or other electrode. Also in this embodiment, the service life of the needle electrode is increased to a particularly great extent.
  • the needle electrode is preferably formed as in EP 1 640 160 B1 described, in particular as described in the embodiments of this document.
  • the electrical switching device comprises at least one of the following components: thyristor, transistor, relay, switch with actuator, manual switch. It is understood that the components in question are designed for the at least one electrical high voltage which is applied to the various electrodes. It is also possible to cascade several components of the aforementioned type in order to use components that are designed for lower than the at least one high voltage to be switched, for example by cascading two thyristors for 5 kV high voltage at a switching high voltage of 10 kV ,
  • the switch When using a switch with actuator (actuator), the switch is actuated by the actuator.
  • the actuator is an electromechanical drive.
  • the electromechanical drive can be controlled by energizing.
  • the control of the switching device can be done manually by an operator.
  • the device for discharging substantially insulating web materials comprises a signal device which indicates to the operator when to use the Should operate switching device.
  • the electrical signal device can output a corresponding signal after the lapse of a specific period of time or a specific operating time of the device for discharging or a device comprising it for producing or processing substantially insulating web materials. This may in particular be an optical and / or an acoustic signal.
  • the switch is a two-pole changeover switch.
  • the two-pole changeover switch can be actuated by an actuator or manually.
  • the normally open contacts of a relay can be components of a two-pole changeover switch.
  • a further embodiment comprises an electrical control device connected to the electrical switching device, which is designed to switch the electrical switching device from the first switching position to the second switching position or from the second switching position to the first switching position when at least one specific event occurs.
  • the electrical switching device can be switched automatically. As a result, the operation is facilitated and achieved an even better homogenization of the electrode wear than in the manual control.
  • the event that causes the electrical control device to switch to another shift position is selected from at least one of the following events: expiration of a certain period of time, machine run over a certain period of time, machine start, machine stop.
  • the event may be the expiration of a certain absolute period of time or the expiration of a period of time during which the unloading device or apparatus comprising it is operated to produce or process substantially insulating web materials.
  • it is possible to carry out the switching during operation of a device for producing or processing electrically insulating sheet materials.
  • the electrical High voltage supply to avoid short circuits are switched off for a short time.
  • the switchover to downtime of the apparatus for making or processing substantially insulating web materials may be limited. This can be done after a machine stop before a machine start switching.
  • the electrical high voltage power supply can be switched off after a machine stop and switched on before a machine start.
  • the electrical control device has a connection to the electrical high voltage source.
  • the electrical high voltage source is structurally separated from the electrode assembly.
  • the electrical high voltage source can be connected via cables or other electrical connection lines with the electrode assembly.
  • the electrical high voltage source is structurally integrated into the electrode assembly. This has the advantage that high-voltage lines outside the electrode arrangement can be avoided. As a result, hazards to the operating staff can be further reduced by the use of electrical high voltage.
  • the electrode assembly comprises a needle electrode having at least one row of electrically conductive needles, an integrated high voltage transformer having a low voltage input and a high voltage output, an electrical rectifier connected to the high voltage output, and the electrical switching means connecting the electrical rectifier to the needles.
  • the electrical switching device is preferably connected via at least one electrical control cable or another control line to the electrical control device.
  • the low voltage input of the integrated High-voltage transformer is connected in accordance with another embodiment via cables or other electrical lines to an external low-voltage electrical source. In another embodiment, the low voltage electrical source is a 24 volt AC source.
  • the electrical high voltage source supplies at least one adjustable high voltage. This allows adaptation of the high voltage for the discharge of the web material, so that the web material is discharged in the best possible way.
  • the electrical control device is designed to control the electrical high-voltage source so that it provides at least one electrical high voltage whose height and / or polarity depends on the charging of a web material which is guided past the electrode arrangement.
  • the high voltage electric power source provides a positive polarity electric high voltage and a negative polarity electric high voltage
  • the heights of both high voltages can be controlled individually depending on the charging of the sheet material.
  • the positive and negative high voltage may have the same amount or different amounts.
  • the controller may control that the high voltage of certain polarity has a negative or positive polarity and a certain level.
  • the device comprises at least one field strength measuring device, which is designed to detect the charging of a web material guided past the electrode arrangement, wherein the field strength measuring device is connected to the electrical control device which cooperates with connected to the electrical high voltage source and is adapted to control the electrical high voltage source so that it provides an electrical high voltage whose height depends on the measured by the field strength measuring device charging of the web material.
  • a discharge is controlled automatically depending on the charging of the web material.
  • the invention relates to an apparatus for producing or processing a substantially insulating web material, in particular a film extrusion machine, a film blowing machine, a printing press, a roll winder, a slitter or a foil bag machine, comprising a device for unloading according to one of claims 1 to 13 or one of above embodiments.
  • the printing machine is a rotary printing machine.
  • it is a gravure printing machine, flexographic printing press, offset printing press, high-pressure machine, planographic printing machine or screen printing machine.
  • the rotary printing press has a roll winder, in particular a turning roll winder.
  • the device for unloading can be advantageously used when the substantially insulating web material is wound into a roll. However, it can also be used when the substantially insulating web material is not wound into a roll and disturbing charges of the web material to be avoided. This is the case, for example, when the web material is rapidly processed into packaging materials, the charges interfering with the processing process and / or resulting in undesirable storage of electrical charges in a stack formed from the packaging materials.
  • a printing unit 1 of a rotogravure printing press comprises a rotogravure cylinder 2 rotatably mounted about an axis of rotation and immersed at the bottom with the circumference in color 3 in a paint trough 4.
  • a press cylinder 5 is arranged rotatably mounted about a further axis of rotation, which is parallel to the axis of rotation of the gravure cylinder 2.
  • the press cylinder 5 has an insulating layer on the outer periphery and a semiconductive layer thereon.
  • a plastic film web or another substantially insulating web material 6 is guided laterally over two deflection rollers 7, 8 to the gap 9 between gravure cylinder 2 and press cylinder 5 and away from it.
  • each needle electrode 12 has two parallel rows 13, 14 of electrically conductive needles 15. Furthermore, each needle electrode 12 has an electrically conductive housing 16. In the electrically conductive housing 16, the needles 15 are held in an insulating potting compound 17.
  • the row 13 of needles 15 forms a first electrode 18 and the row 14 of needles 15 forms a second electrode 19th
  • each needle electrode 12 has terminals 20, 21 and a socket, respectively, for connection to a high voltage electrical source 22 which provides positive and negative electrical high voltages.
  • the needles 15 of each row 13, 14 are connected to a terminal 20, 21 of the needle electrode 12.
  • the terminals 20, 21 of the two needle electrodes 12 are each connected via a high voltage cable 23 and an electrical switching device 24 to a high voltage electrical source 22.
  • the switching device 24 is a relay 25 with a two-pole changeover switch 26.
  • the one input of the two-pole changeover switch is connected to the positive pole of the electrical high voltage source 22 and the other input is connected to the negative pole of the electrical high voltage source 22.
  • the control side 27 of each relay 25 is connected to an electric control device 28.
  • the electrical high voltage sources 22, the electrical switching devices 24 and the electrical control device 28 are arranged.
  • the needle electrode 30 is bar-shaped.
  • All needle electrodes 12, 30 can basically be formed as in the EP 1 640 160 B1 in particular in the embodiments of this document.
  • the needle electrode 30 of the ESA is connected via a further high-voltage cable 31 to a further high-voltage electrical source, which is arranged in the device housing 29.
  • the electric control device 28 has an input which can be connected to a signal line to a sensor which detects the start of the printing operation of the rotogravure printing press.
  • the electrical control device 28 includes a time detection that detects the machine running time of the rotogravure printing machine.
  • the electrical control device is designed so that it switches off when exceeding a defined machine running time at the next machine stop, the electrical high voltage sources 22 and then the electrical switching device 24 switches so that the two poles of the electrical high voltage source 22 respectively with the needles 15 of the other row 13, 14th get connected.
  • the electrical control device 28 is designed such that the electrical high-voltage sources 22 are switched on again at the next engine start and the machine running time is detected again.
  • the electrical high voltage sources 22 are switched off again at the next machine stop and then the electrical switching devices 24 so switched, so in turn abut the poles of the electrical high voltage sources 22 respectively to the needles 15 of the other rows 13, 14. As a result, a uniform needle wear is achieved.
  • the needle electrode 30 of the ESA is fed via the further electrical high-voltage source in order to achieve an optimum color transition from the gravure cylinder 2 to the web material 6.
  • the charging of the web material 6 by transport, friction, ESA, etc. is compensated by the needle electrodes 11.
  • the rotogravure printing machine preferably comprises a plurality of printing units 1 for different colors (for example CYMK, possibly spot colors, effect varnishes etc.), which are designed and are in the described manner.
  • CYMK CYMK, possibly spot colors, effect varnishes etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Elimination Of Static Electricity (AREA)
  • Replacement Of Web Rolls (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Advancing Webs (AREA)
EP19174113.1A 2018-05-28 2019-05-13 Dispositif de déchargement de bandes en matière plastique ou d'autres bandes de matière sensiblement isolantes Active EP3575249B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202018102961.4U DE202018102961U1 (de) 2018-05-28 2018-05-28 Vorrichtung zum Entladen von Kunststofffolienbahnen oder anderen im Wesentlichen isolierenden Bahnmaterialien

Publications (3)

Publication Number Publication Date
EP3575249A1 true EP3575249A1 (fr) 2019-12-04
EP3575249B1 EP3575249B1 (fr) 2023-09-06
EP3575249C0 EP3575249C0 (fr) 2023-09-06

Family

ID=66529883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19174113.1A Active EP3575249B1 (fr) 2018-05-28 2019-05-13 Dispositif de déchargement de bandes en matière plastique ou d'autres bandes de matière sensiblement isolantes

Country Status (4)

Country Link
EP (1) EP3575249B1 (fr)
DE (1) DE202018102961U1 (fr)
ES (1) ES2965871T3 (fr)
PL (1) PL3575249T3 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202004014952U1 (de) * 2004-09-25 2006-02-02 Dettke, Christa Elektrode für eine Rotationsdruckmaschine und elektrostatische Druckhilfe
US20110134580A1 (en) * 2009-12-09 2011-06-09 Smc Kabushiki Kaisha Ionizer and static charge eliminating method
DE202014103084U1 (de) * 2014-07-04 2015-10-06 Christa Dettke Maschine zum Bearbeiten eines Bahnmaterials
DE202015101468U1 (de) * 2015-03-23 2016-06-24 Christa Dettke Rotationsdruckmaschine mit Einrichtungen zur Verringerung einer Aufladung des Bedruckstoffs
EP3222421A1 (fr) 2016-03-23 2017-09-27 Christa Dettke Enrouleur avec stockage d'une charge électrique d'un matériau en bande

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202004014952U1 (de) * 2004-09-25 2006-02-02 Dettke, Christa Elektrode für eine Rotationsdruckmaschine und elektrostatische Druckhilfe
EP1640160A1 (fr) 2004-09-25 2006-03-29 Christa Dettke Électrode pour une machine d'impression rotative et un dispositif auxiliaire électrostatique d'impression
US20110134580A1 (en) * 2009-12-09 2011-06-09 Smc Kabushiki Kaisha Ionizer and static charge eliminating method
DE202014103084U1 (de) * 2014-07-04 2015-10-06 Christa Dettke Maschine zum Bearbeiten eines Bahnmaterials
DE202015101468U1 (de) * 2015-03-23 2016-06-24 Christa Dettke Rotationsdruckmaschine mit Einrichtungen zur Verringerung einer Aufladung des Bedruckstoffs
EP3222421A1 (fr) 2016-03-23 2017-09-27 Christa Dettke Enrouleur avec stockage d'une charge électrique d'un matériau en bande

Also Published As

Publication number Publication date
ES2965871T3 (es) 2024-04-17
EP3575249B1 (fr) 2023-09-06
EP3575249C0 (fr) 2023-09-06
DE202018102961U1 (de) 2019-08-30
PL3575249T3 (pl) 2024-03-04

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