EP2775577A1 - Appareil d'ionisation - Google Patents

Appareil d'ionisation Download PDF

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Publication number
EP2775577A1
EP2775577A1 EP13001078.8A EP13001078A EP2775577A1 EP 2775577 A1 EP2775577 A1 EP 2775577A1 EP 13001078 A EP13001078 A EP 13001078A EP 2775577 A1 EP2775577 A1 EP 2775577A1
Authority
EP
European Patent Office
Prior art keywords
electrode
ion emitting
measuring
housing
voltage
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
EP13001078.8A
Other languages
German (de)
English (en)
Other versions
EP2775577B1 (fr
Inventor
Bart Stegeman
Thijs Loo
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.)
Illinois Tool Works Inc
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Illinois Tool Works Inc
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Filing date
Publication date
Application filed by Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Priority to EP13001078.8A priority Critical patent/EP2775577B1/fr
Publication of EP2775577A1 publication Critical patent/EP2775577A1/fr
Application granted granted Critical
Publication of EP2775577B1 publication Critical patent/EP2775577B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • H01T23/00—Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere
    • 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
    • H01T19/04—Devices providing for corona discharge having pointed electrodes

Definitions

  • the invention is directed to a ionization apparatus according to the general part of claim 1 and to a method for detecting an indication for surface housing pollution on the housing surface of an ionization apparatus according to the general part of claim 12.
  • the ionization apparatus in question has its application in controlling the charge of a target area.
  • this includes the neutralisation of a target area which is often required when plastic films are being processed in the bag-making industry or the like.
  • a known ionization apparatus (EP 2 061 124 A2 ), which is to be considered the starting point of the invention, comprises a high voltage power supply arrangement with a ion emitting electrode connected thereto.
  • the voltage power supply arrangement supplies a bipolar voltage against ground potential to a so called ionizer bar.
  • Such a ionizer bar normally comprises a number of ion emitting electrodes that are supplied with the voltage of the high voltage power supply arrangement.
  • the above noted hosing surface pollution may, depending on its composition, provide a layer of conducting material on the housing surface which can lead to decrease in performance or even a shortcut situation.
  • the problem underling the invention is to improve the known ionization apparatus such that the buildup of housing surface pollution can be detected in a reproducible manner.
  • the proposed solution is based on the finding that the electrical properties of housing surface pollution may be used for an easy detection of the buildup of such housing surface pollution.
  • a measuring arrangement with at least one measuring electrode connected thereto is provided for detecting an indication for housing surface pollution, which detecting is based on a change in complex resistance between at least one said ion emitting electrode and at least one said measuring electrode.
  • the at least one ion emitting electrode is coupled to ground potential via a complex resistance that depending on the installation may be composed of a large number of ohmic devices, capacitive devices and, if so, even inductive devices.
  • a complex resistance that depending on the installation may be composed of a large number of ohmic devices, capacitive devices and, if so, even inductive devices.
  • the positioning of the measuring electrode is correct in the above noted sense if the buildup of housing surface pollution leads to a change in voltage measured at the measuring electrode against ground.
  • the complex resistance between the ion emitting electrode and ground may be seen as two complex resistances that are serially coupled. In this sense one complex resistance corresponds to the path between the ion emitting electrode and the measuring electrode and the other complex resistance corresponds to the path between the measuring electrode and the ground potential.
  • AC-voltage is to be widely understood. For example, it includes a pulsed DC-voltage as will be explained further down.
  • At least one said ion emitting electrode and at least one said measuring electrode are to be located on opposite sides of a housing wall which surface pollution is to be detected. This has been proven successful especially when the respective housing wall is made of a plastic material.
  • the housing comprises at least one rib like wall segment that mechanically protects the at least one ion emitting electrode which protrude from a housing wall and that the at least one rib like wall segment is detachably connected to the rest of the housing.
  • This rib like wall segment is preferably, connected to the rest of the housing via a snap fit connection.
  • a ionization apparatus comprising a housing and at least partly within the housing a high voltage power supply arrangement with a ion emitting electrode connected thereto, wherein the housing comprises at least one rib like wall segment that mechanically protects the ion emitting electrodes protruding from a housing wall and that the at least one rib like wall segment is detachably connected to the rest of the housing, preferably, wherein the rib like wall segment is connected to the rest of the housing via a snap fit connection, shall be claimable as such as well.
  • an above noted measuring arrangement with at least one measuring electrode connected thereto is provided and that an indication for housing surface pollution is being detected by the measuring arrangement based on a change in complex resistance between at least one said ion emitting electrode and at least one said measuring electrode.
  • the method according to claim 12 is directed to the operation of the ionization apparatus according to claim 1. All explanations and advantageous variants explained with reference to claim 1 are fully applicable to the teaching of claim 12.
  • the ionization apparatus shown in Fig. 1 may be applied in various areas as explained in the general part of the specification.
  • the main area of application for the displayed ionization apparatus is the neutralization which is not to be understood as a restriction.
  • the ionization apparatus comprises a housing 1.
  • housing is to be understood in a broad sense. Accordingly the housing includes all components that are depicted with reference numbers 1a, 1b, 1c and 1d, 1e and 1f. Those components 1a-f will be explained in detail later on.
  • a high voltage power supply arrangement 2 with at least one ion emitting electrode 3-5 is provided.
  • at least one ion emitting electrode 3-5 is provided.
  • three ion emitting electrodes 3-5 are realized. Depending from the application more or fewer ion emitting electrodes 3-5 may be necessary.
  • a measuring arrangement 6 with at least one measuring electrode 7, 8 connected thereto is provided for detecting an indication for housing surface pollution based on a change in complex resistance Z' between at least one said ion emitting electrode 3-5 and at least one said measuring electrode 7, 8.
  • the at least one said ion emitting electrode 3-5 builds one common measurement port and the at least one said measuring electrode 7, 8 builds the other common measurement port.
  • a measuring electrode 7, 8 is assigned to a particular ion emitting electrode 3-5, such that the detection of the indication for housing surface pollution is based on a change in complex resistance Z' between the ion emitting electrode 3-5 and the measuring electrode 7, 8 assigned thereto.
  • the complex resistance Z' is shown in Fig. 2 in the sense of an equivalent circuit. As this is only the display of a theoretical approach to explain the real electric arrangement the complex resistance Z ' is only displayed in dotted lines.
  • a complex resistance Z is present according to the equivalent circuit.
  • the complex resistance Z is composed of a serious of the two complex resistances Z' and Z" .
  • the measuring electrode 8 is measuring exactly between the complex resistances Z' and. Z".
  • the complex resistance Z' describes the path between the ion emitting electrode 5 and the measuring electrode 8, comprising the sub-path between the ion emitting electrode 5 and the housing 1, which is mainly an air capacity and the path through the housing 1 itself.
  • the path between the ion emitting electrode 5 and the measuring electrode 8 may comprise a layer of housing surface pollution P which influences at least the value of the complex resistance Z' .
  • the high voltage power supply arrangement 2 supplies high voltage with an AC-component to the ion emitting electrode 3-5 against ground.
  • the high voltage power supply arrangement 2 in this respect supplies a modulated, further preferably a pulsed, DC-voltage to the ion emitting electrode 3-5 against ground.
  • the supplied voltage is nothing else but a PWM-voltage with a certain duty-cycle.
  • the preferred value of the modulated, here and preferably pulsed, DC-voltage preferably lies between 2 kV and 60 kV, preferably between 20 kV and 40 kV.
  • the pulse frequency lies between 0,5 Hz and 100 Hz, preferably between 1 Hz and 10 Hz.
  • multiple ion emitting electrodes 3-5 are provided and that at least some of the ion emitting electrodes 3-5 are each assigned at least one said measuring electrode 7, 8, here and preferably exactly one measuring electrode 7, 8, for detecting an indication for housing surface pollution based on a change in complex resistance Z' between the respective ion emitting electrode 3, 5 and the respective measuring electrode 7, 8.
  • the measuring electrode 7 is assigned to the ion emitting electrode 3 and the measuring electrode 8 is assigned to the ion emitting electrode 5.
  • at least some of the ion emitting electrodes 3-5 are as an electrode-group assigned to a measuring electrode 7, 8 or to multiple measuring electrodes 7, 8.
  • the high voltage power supply arrangement 2 supplies modulated, here and preferably pulsed, positive high DC-voltage to a first electrode-group of ion emitting electrodes 3, 4 against ground and modulated, preferably pulsed, negative high DC-voltage to a second electrode-group of ion emitting electrodes 5 against ground.
  • modulated, here and preferably pulsed, positive high DC-voltage to a first electrode-group of ion emitting electrodes 3, 4 against ground and modulated, preferably pulsed, negative high DC-voltage to a second electrode-group of ion emitting electrodes 5 against ground.
  • electrode-group is to be understood in a broad sense such that only one electrode can compose such an electrode-group. This is applicable for electrode 5 as noted above.
  • the high voltage power supply arrangement 2 synchronizes the voltages supplied to the ion emitting electrodes 3, 4 and 5 such that during operation, in an alternating manner, the a first electrode-group consisting of electrodes 3, 4 is supplied with a reference voltage and the second electrode-group consisting of electrode 5 is provided with high positive DC-voltage and then the first electrode-group consisting of electrodes 3, 4 is supplied with high negative DC-voltage and the second electrode-group consisting of electrode 5 is supplied with the reference voltage.
  • the supply with the reference voltage generally corresponds to the supply with ground potential.
  • the reference voltage is a relatively low voltage against ground potential, for example a voltage in the area of 1 kV and 5 kV against ground potential.
  • high positive DC-voltage and high negative DC-voltage may be of the same value against ground potential. In another embodiment, however, those positive and negative voltages may be of different value against ground such that an unsymmetrically voltage supply will result.
  • the above noted voltage supply at the electrodes 3-5 may be used for detecting an indication for housing surface pollution as noted above.
  • the measuring arrangement 6 evaluates the voltage against ground 9 at the measuring electrodes 7, 8 during ionization by the ion emitting electrodes 3-5. This leads to a very simple measuring arrangement as the measurement is reduced to detecting a voltage at the measuring electrode 7, 8 against ground 9.
  • a measurement arrangement 6 comprises a comparator unit 10 which compares the voltage against ground 9 at the measuring electrode 7, 8 to a threshold value V ref and outputs a signal CLB (cleanbar) depending on the result of the comparison. If the voltage against ground at the measuring electrode exceeds the threshold value V ref the output signal CLB is set to a high level. If the voltage against ground at the measuring electrode 7, 8 stays below the threshold value the output signal CLB is set to a low level.
  • the comparator unit 10 may be an electronic part like an operational amplifier, a microcontroller or the like.
  • the value of the above noted voltage at the measuring electrode 7, 8 may also be transferred to other components via a serial data interface and/or a data bus system. For this, preferably, a analog/digital conversion is being performed on the measured voltage.
  • a rectifier 11 is preferably provided between the measuring electrode 7, 8 and the comparator unit 10. This rectifier 11 in this sense is designed to pass through only the positive half-waves for the electrodes 3,4 and the negative half-waves for the electrode 5.
  • At least one filter preferably a low-pass filter 12, is provided for smoothening out the measured signal.
  • the measuring electrodes 7, 8 are provided in addition to the ion emitting electrodes 3-5. This makes the electric circuit of the measuring arrangement 6 simple and cost efficient. However, it may be advantageous to use at least one ion emitting electrode 3-5 as a measuring electrode. This can reduce the complexity on the side of the measuring electrode.
  • housing wall 13 is at least a double wall consisting of housing components 1a, 1b and 1d. All of those housing components are here and preferably non-conductive components.
  • the housing components 1a and 1d are made of plastics, in particular PVC, while housing component 1b is a casting resin.
  • the ion emitting electrode 3-5 and the measuring electrode 7, 8 assigned to the respective ion emitting electrode 3-5 are located offset from one another along the housing wall 13, 14 which surface pollution is to be detected.
  • the above noted offset is indicated in Fig. 1 with the reference number 15.
  • housing wall 13, 14 which surface pollution is to be detected is made of a plastic material, preferably of PVC. It is generally possible, however, that for such housing walls 13, 14 coated metal or the like is being used.
  • Fig. 2 shows that the measuring electrode 7, 8 is located close to the respective side of the housing wall 13, 14 which surface pollution is to be detected.
  • the measuring electrode 7, 8 is even in contact to the respective side of the housing wall 13, 14, here to the lower side of the respective housing wall 13, 14.
  • the measuring electrode 7, 8 is spring tensioned against the respective side of the housing wall 13, 14. Accordingly a spring is coupled to the measuring electrode 7, 8 as is shown in Fig. 2 as well.
  • the measuring electrode 7, 8 is preferably of spherical design. With this it is possible to provide a punctual contact to the respective housing wall 13, 14 such that this contact in electrical terms, in particular in view of the capacity between the measuring electrode 7, 8 and the respective housing wall 13, 14, stays exactly constant even if a certain deformation of the housing 1 due to temperature changes occur.
  • the structure of the housing 1 is simple for the shown embodiment.
  • the housing 1 comprises the housing component 1a which carries the ion emitting electrodes 3-5 as well as a PCB 16 for the high voltage power supply arrangement 2 as well as for the measuring arrangement 6.
  • the measuring electrodes 7, 8 are fixed on the PCB 16 and press against the lower side of the housing component 1a,
  • the housing 1a is closed to the bottom side by the housing component 1c which may be of plastics material as well or of metal material.
  • the ion emitting electrodes 3-5 are constructed in an interesting manner, as may be seen from Fig. 2 .
  • the electrodes 3-5 comprise a non conducting sheathing 3a, 5a which may be exchanged if the surface pollution on the sheathing 3a, 5a has built up to a certain level. The exchange may be easily done after screwing off the conductive ion emitting head portions 3b, 5b.
  • the sheathing 3a, 5a may be of hose like structure made of silicone or the like.
  • the housing 1 further comprises two rib like wall segments 1d that mechanically protect the ion emitting electrodes 3-5 which are protruding from the housing wall 13, 14.
  • those rib like wall segments 1d extend along the electrodes 3-5 such that the electrodes 3-5 are not being damaged by any components moving by the ionization apparatus during industrial operation.
  • the two rib like wall segments 1d are each detachably connected to the rest of the housing 1.
  • the rib like wall segments 1d are connected to the rest of the housing 1 via a snap fit connection.
  • the rib like wall segments 1d comprise mounting flaps 1e and 1f that engage the rest of the housing 1 on an upper side and on a lower side.
  • a method for detecting an indication for surface housing pollution P on the housing surface of an above noted ionization apparatus is claimed.
  • an above noted measuring arrangement 6 is provided with a measuring electrode 7, 8 connected thereto and that an indication for housing surface pollution P is being detected by the measuring arrangement 6 based on a change in complex resistance Z' between the ion emitting electrode 3-5 and the assigned measuring electrode 7, 8.

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  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Elimination Of Static Electricity (AREA)
EP13001078.8A 2013-03-04 2013-03-04 Appareil d'ionisation Active EP2775577B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13001078.8A EP2775577B1 (fr) 2013-03-04 2013-03-04 Appareil d'ionisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13001078.8A EP2775577B1 (fr) 2013-03-04 2013-03-04 Appareil d'ionisation

Publications (2)

Publication Number Publication Date
EP2775577A1 true EP2775577A1 (fr) 2014-09-10
EP2775577B1 EP2775577B1 (fr) 2017-02-01

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EP13001078.8A Active EP2775577B1 (fr) 2013-03-04 2013-03-04 Appareil d'ionisation

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EP (1) EP2775577B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850759A1 (fr) * 1996-10-11 1998-07-01 Shinko Co., Ltd. Dispositif auxiliaire électrostatique de l'impression avec un détecteur de lacontamination
JP2002025791A (ja) * 2000-07-12 2002-01-25 Hugle Electronics Inc Ａｃ電源方式イオナイザー
EP2061124A2 (fr) 2007-11-19 2009-05-20 Illinois Tool Works Inc. Appareil de contrôle à axes multiples pour systèmes d'ionisation
DE102011017796A1 (de) * 2011-04-29 2012-10-31 Illinois Tool Works Inc. Hochspannungselektrodenanordnung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0850759A1 (fr) * 1996-10-11 1998-07-01 Shinko Co., Ltd. Dispositif auxiliaire électrostatique de l'impression avec un détecteur de lacontamination
JP2002025791A (ja) * 2000-07-12 2002-01-25 Hugle Electronics Inc Ａｃ電源方式イオナイザー
EP2061124A2 (fr) 2007-11-19 2009-05-20 Illinois Tool Works Inc. Appareil de contrôle à axes multiples pour systèmes d'ionisation
DE102011017796A1 (de) * 2011-04-29 2012-10-31 Illinois Tool Works Inc. Hochspannungselektrodenanordnung

Also Published As

Publication number Publication date
EP2775577B1 (fr) 2017-02-01

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