EP3871300A1 - Elektrode für die erzeugung einer koronaentladung - Google Patents
Elektrode für die erzeugung einer koronaentladungInfo
- Publication number
- EP3871300A1 EP3871300A1 EP19805885.1A EP19805885A EP3871300A1 EP 3871300 A1 EP3871300 A1 EP 3871300A1 EP 19805885 A EP19805885 A EP 19805885A EP 3871300 A1 EP3871300 A1 EP 3871300A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- hold
- roof
- electrode
- electrode according
- 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
Links
- 239000003989 dielectric material Substances 0.000 claims description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000011888 foil Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000003851 corona treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- 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 an electrode for generating a corona discharge comprising a current-conducting elongated core and an envelope made of a dielectric material with a longitudinal channel for the core, the longitudinal channel extending over its length from a bottom and one extending over the bottom Roof is limited and the bottom of the core rests on the bottom of the longitudinal channel.
- Such electrodes are required for the activating treatment of foils, which are guided over a roller acting as a counter electrode.
- the electrode is mounted at a short distance and parallel to the roller, so that there is a gap between it and the roller in which a plasma is formed when a sufficiently high voltage is applied to the electrode.
- the film runs through the gap and is activated by the plasma.
- the electrode In order to prevent breakdowns, the electrode has a covering made of a dielectric material, which is also used for fastening in a system for corona pretreatment. Since the current-carrying metallic core must run at a constant distance from the roller in order to generate a uniform plasma over the length of the electrode, the core must be fixed in position in the covering.
- the dielectric material that envelops the core is generally a ceramic. Ceramics, however, are very fragile and also have a relatively low coefficient of thermal expansion, so that the ceramic must not tightly enclose the core because the core, which heats up and expands during operation, would otherwise burst the casing.
- the invention is therefore based on the task of creating an electric rode, the core of which lies precisely in a casing and is also easy to assemble.
- the invention provides that the core over its length a distance from the roof of the
- Hold-down element runs between the top of the core and the roof of the longitudinal channel, each
- Hold-down element in at least one itself
- Hold-down elements each form a unitary component that extends over the length of the longitudinal channel
- Sheathing, core and hold-down element can therefore be provided by the meter, depending on the desired length of the electrode
- Sections are separated, which are then inserted into the longitudinal channel.
- no more than 4 contact lines are required, and in particular no more than 3 contact lines, in the latter case one contact line on the core and two contact lines on the roof or vice versa two contact lines on the core and one on the roof.
- the core is formed by a flat bar, the flat side of which rests on the bottom of the envelope.
- the hold-down element is preferably formed from a round rod or a tube, which at one by one Expansion induced by heating undergoes a change in shape, as a result of which the pressure on the contact lines remains low and is not sufficient to blow up the sheath. This is particularly true for the tube.
- a longitudinal groove can be formed either in the roof or in the core, so that the round rod or the tube abuts the edges of the groove and thus two contact lines are formed there.
- the roof of the inner wrapping has two flanks enclosing an acute angle, with a contact line running in each flank. This means that the round bar or tube lies in two contact lines on the roof.
- a longitudinal groove can be formed at the intersection of the two flanks, the edges of the groove forming the contact lines.
- the core is made particularly wide, it can also be provided that several hold-down elements are arranged in parallel.
- the electrode Since the electrode is required in a plant for the corona treatment of foils, one runs on its top Rail for fastening the electrode at a distance from a roller that forms the counter electrode.
- both the core and the hold-down element consist of an electrically conductive material, the hold-down element can be connected to a
- High voltage source must be set up so that the
- High voltage source is connected to the core via the hold-down element and a corresponding one
- Potential gradient is built up to the counter electrode.
- Fig. 1 shows a cross section through an electrode in egg ner first cross-sectional shape
- Fig. 2 shows a cross section through an electrode in egg ner second embodiment.
- the electrode 1 consists of a metallic core 2 and an envelope 3 made of a dielectric material, in particular a ceramic.
- the envelope 3 is formed as a profile with a constant cross-section. In it runs a longitudinal channel 4 for receiving egg nes core 2 in the form of a flat steel and a hold-down element in the form of a tube 5, preferably just if made of a metallic material, so that electrical contact can also be made with the core 2 via the tube 5.
- the casing 3 On its upper side, has a rail with an undercut 7 having a mounting groove 6, in which a corresponding holding, not shown here, can be used, which has lateral webs which engage in the undercuts 7.
- the electrodes are elongated and extend over several meters, depending on the size of the roller serving as the counterelectrode for corona pretreatment of foils.
- the sheath 3 and the core 2 are therefore by the meter, which are shortened according to the desired length.
- the core 2 is first inserted into the longitudinal channel 4 so that it rests on the bottom of the longitudinal channel 4.
- the tube 5 is then pushed in, making contact with the core 2 along a contact line 9 and in two contact lines 10, 11
- the core and the tube can also be inserted into the longitudinal channel 4 at the same time.
- the longitudinal channel 4 of the casing 3 is in principle rectangular, with a longitudinal groove 8 also running in the roof, the edges of which form the two contact lines 10 and 11.
- the roof in this case there are only two contact lines, namely on the one hand to the core 2 and on the other hand exactly opposite on the roof of the cladding 2.
- two or more tubes can also be parallel to each other be arranged in the longitudinal channel 4.
- the cross-sectional shape according to FIG. 2 is essentially triangular.
- the roof is formed by two flanks 12, 13, which enclose an acute angle.
- a longitudinal groove 13 can be provided in the convergence of the two flanks, the dimensions of which can be selected so that the contact lines 10, 11 in the
- the sheath 2 is not blown up, since, in particular in the case of a tube design of the holding element, this deforms during expansion, so that the contact forces in the contact lines are not increased and a bursting of the ceramic sheathing 2 is avoided.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Resistance Heating (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018126843.2A DE102018126843A1 (de) | 2018-10-26 | 2018-10-26 | Elektrode für die Erzeugung einer Koronaentladung |
PCT/DE2019/200120 WO2020083448A1 (de) | 2018-10-26 | 2019-10-24 | Elektrode für die erzeugung einer koronaentladung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3871300A1 true EP3871300A1 (de) | 2021-09-01 |
EP3871300B1 EP3871300B1 (de) | 2024-04-10 |
Family
ID=68617967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19805885.1A Active EP3871300B1 (de) | 2018-10-26 | 2019-10-24 | Elektrode für die erzeugung einer koronaentladung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3871300B1 (de) |
DE (2) | DE102018126843A1 (de) |
DK (1) | DK3871300T3 (de) |
WO (1) | WO2020083448A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145386A (en) * | 1977-06-29 | 1979-03-20 | Union Carbide Corporation | Method for the surface treatment of thermoplastic materials |
US4575329A (en) * | 1984-01-09 | 1986-03-11 | Andreas Ahlbrandt | Electrode element for corona treater |
DE19531898A1 (de) | 1995-08-30 | 1997-03-06 | Afs Entwicklungs & Vertriebs G | Elektrode für die Coronabehandlung von Folien |
DE59900978D1 (de) * | 1999-04-21 | 2002-04-18 | Softal Elektronik Gmbh | Barrierenelektrode zur Oberflächenbehandlung von elektrisch leitenden oder nichtleitenden Materialien sowie Anordnung derartiger Barrierenelektroden |
-
2018
- 2018-10-26 DE DE102018126843.2A patent/DE102018126843A1/de not_active Withdrawn
-
2019
- 2019-10-24 WO PCT/DE2019/200120 patent/WO2020083448A1/de unknown
- 2019-10-24 DK DK19805885.1T patent/DK3871300T3/da active
- 2019-10-24 EP EP19805885.1A patent/EP3871300B1/de active Active
- 2019-10-24 DE DE112019005305.1T patent/DE112019005305A5/de active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020083448A1 (de) | 2020-04-30 |
EP3871300B1 (de) | 2024-04-10 |
DE112019005305A5 (de) | 2021-07-22 |
DK3871300T3 (da) | 2024-05-21 |
DE102018126843A1 (de) | 2020-04-30 |
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