EP4387827A1 - Elektrode und verfahren zum beaufschlagen einer oberfläche eines leitenden oder nichtleitenden werkstoffes - Google Patents
Elektrode und verfahren zum beaufschlagen einer oberfläche eines leitenden oder nichtleitenden werkstoffesInfo
- Publication number
- EP4387827A1 EP4387827A1 EP22757212.0A EP22757212A EP4387827A1 EP 4387827 A1 EP4387827 A1 EP 4387827A1 EP 22757212 A EP22757212 A EP 22757212A EP 4387827 A1 EP4387827 A1 EP 4387827A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductive material
- electrically conductive
- electrical
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
-
- 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
-
- 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 relates to an electrode and a method for applying an electrical potential to a surface of a conductive or non-conductive material.
- plastic materials are often subjected to an electrical potential in order to influence their properties.
- the material is influenced by an electrode with an electrical potential.
- this electrode does not touch the material.
- the material is placed on or passed over an object that is subjected to a further electrical potential.
- This object is often grounded so that the further electrical potential is zero.
- this object is often a roll or roller over which the plastic film runs.
- Needle electrodes are often used in which a plurality of needles are arranged in a row, with the row extending parallel to the surface of the material. The needles themselves are usually aligned orthogonally to the surface of the material. Thus, a very strong electric field can emanate from each needle tip.
- the problem here is that there is also an inhomogeneous electrical field on the surface of the material, so that the material is not evenly influenced.
- the electrical field can cause a charge transfer, so that an electrical charge is created at least on the surface of the material.
- the charge transfers in the material differ locally. Permanent traces can remain in the material, which can be disadvantageous for subsequent processing steps of the material. This is often visible when the material is a plastic material and in particular a plastic film, the surface of which is often very delicate.
- the object of the present invention is therefore to propose an electrode and a method with which the disadvantages mentioned are avoided.
- an electrode for acting on a surface of a conductive or non-conductive material, in particular a plastic material, with an electrical potential that in particular causes electrical polarization, with a first electrically conductive material, in particular a metal wire, extending at least partially parallel to the surface, with a second electrically conductive material extending at least partially parallel to the surface, at least one electrical connection which connects the first electrically conductive material to the second electrically conductive material, the first electrically conductive material having a higher conductivity than the second electrically conductive material .
- an electrically conductive material is a component that can include various chemical substances.
- a component can be a metal wire, for example, where the metal used can include an alloy.
- a component can also have a layered structure with different electrically conductive and/or electrically insulating materials.
- the first electrically conductive material extends parallel to the surface of the material. If the material, for example in the case of transported plastic films, is moved over rollers or the like, one can speak of a tangential plane here instead of a surface.
- the conductive material preferably extends transversely to the direction of transport or movement of the material, ie, in the case of a roller, parallel to its axis of rotation.
- the second electrically conductive material also extends parallel to the surface, with the second electrically conductive material being arranged between the material surface and the first electrically conductive material.
- An edge of the second electrically conductive material preferably faces the material, so that an electric field is formed between this edge and the material.
- the electrode according to the invention comprises an electrical connection with which an electrical line can be produced between the first electrically conductive material and the second electrically conductive material, so that the second electrical material can be brought to an electrical potential.
- This electrical connection can be established by the first electrically conductive material and the second electrically conductive material being in electrical contact.
- This contact can be made at contact points, in which case a plurality of contact points can be provided and/or this contact point can extend in the direction of the first electrically conductive material, so that contact is established over a distance.
- An electrical connection can also be made by an electrical connecting line.
- the first electrically conductive material has a higher conductivity than the second electrically conductive material.
- the second electrically conductive component can be shaped appropriately to increase an electric field, but no large currents flow that could cause damage to the second electrically conductive material.
- Wires for generating a homogeneous electric field are already known from the prior art, but such wires often have slight inhomogeneities which, if the electric currents are too high, lead to heating and as a result the wire burns out. With the present invention, this effect is avoided.
- the first electrically conductive material can have a large cross-section for higher conductivity, so that the electrical currents do not cause overheating.
- the at least one connecting line can lead the electrical currents to the second electrically conductive material.
- “conductivity” does not mean the specific material-dependent conductivity, but the absolute conductivity, which, in addition to the properties of the substances contained in the respective material, also depends on the cross-sectional area of the material.
- the first electrically conductive material has a conductivity which is at least 10 3 times greater than that of the second electrically conductive material. In this case, the desired effect is particularly evident.
- the first electrically conductive material comprises at least one metal.
- the first electrically conductive material can not only pass on high currents well, but also, in particular if several connecting lines are provided, no or only a very small reduction in the electrical voltage can be observed between two connecting lines.
- the second electrically conductive material comprises at least one plastic.
- the comparatively high currents meet a resistance here and are distributed in the material at the same time.
- the currents are equalized in particular when a plurality of connecting lines are provided.
- the electrical connecting lines at least partially comprise the first electrically conductive material. This means that the same substances can be found here in particular, so that the specific conductivity is not reduced within this part of a connecting line.
- the electrical connecting lines at least partially comprise the second electrically conductive material. There is therefore a transition between the first electrically conductive material and the second electrically conductive material, in particular within the connecting line. Advantages result here in particular in connection with the shaping of the second electrically conductive material described below.
- the second electrically conductive material is formed as at least one plate, layer and/or coating, with the extension parallel to the surface being significantly greater than the thickness of the material.
- the electrical currents are not only distributed one-dimensionally in the electrically conductive material, but essentially two-dimensionally, so that the currents and thus the resulting electrical field on the workpiece are particularly well equalized parallel to the surface of the material.
- the plate, the layer or the coating are preferably arranged orthogonally to the material. In the case where the material is guided over a cylinder or roller, this is thus essentially along a radial line Arranged towards the roll.
- the plate may include at least one conductive material.
- it can also comprise at least one plastic material which has been provided with a conductive paint, for example.
- a plastic material which has been provided with a conductive paint, for example.
- This can be a spray paint.
- a plastic material treated in this way essentially surface currents can then be observed.
- other non-conductive materials can also be provided.
- Conductivity of an otherwise insulating material can also or alternatively be brought about by doping.
- Dopants are atoms of a conductive material, such as metal atoms, that are introduced into the structure of the non-conductive material.
- metal atoms in a crystalline base material can occupy places in the crystal structure. The valence electrons of the metal atoms can then move freely in the crystal structure, which causes conductivity.
- Insulating materials can also be glasses or ceramics, which can also be in the form of plates.
- insulating materials can be provided with a coating or connected with a layer, for example with a conductive foil.
- a coating can be carried out by vapor deposition or with the aid of sputter deposition, with a material vapor being generated in each case by evaporation/atomization of a material, which vapor is deposited on the carrier material. In the case of vaporization, the material vapor is generated thermally, in the case of sputter disposition by bombarding the material with high-energy ions.
- a layer can be a film that does not have its own stability.
- This foil can be a metal foil, a metallized foil or an insulating foil made conductive by analogy with one of the methods described above.
- a foil can be arranged, in particular fastened, to a carrier which preferably consists of an insulating material.
- This can be a glass or a ceramic plate, for example.
- two insulating materials, each provided with a layer or coating can be placed one on top of the other, with the layers or coatings facing each other. The advantage here is that people cannot come into contact with the second electrically conductive material.
- the second electrically conductive material preferably has a thickness of 1 nm to 1000 nm. This is particularly the case when the second electrically conductive material comprises a layer and/or a coating.
- a coating is applied using one of the methods described above, this is preferably carried out in a vacuum environment in which a predetermined proportion of oxygen prevails.
- the material vapor preferably comprises a metal, with a portion of the metal atoms reacting with the oxygen and thus oxidizing. These metal oxides precipitate as insulating molecules while the non-oxidized atoms precipitate as conductive material.
- the resistance of the second electrical material can be adjusted via the oxygen content in the vacuum environment and/or via the thickness of the coating.
- titanium can serve as the metal, which is conductive. Some of the titanium atoms oxidize under the influence of oxygen to form titanium oxide, which is not conductive but is also deposited on the insulating material. Other conceivable materials are zinc or indium.
- a plate, layer and/or coating preferably has a conductivity with the electrical resistance being between 10 and 500 MOhm (megaohms).
- the second electrically conductive material is shaped as a plate, the plate essentially having two surfaces arranged parallel to one another, the surfaces pointing towards the material tapered.
- the electric field strength is particularly high here.
- the second electrically conductive material is shaped as a plate, with the plate having protuberances directed in the direction of the first electrical material, which in particular represent components of the electrical connecting lines.
- the edge of the second electrically conductive material that faces the first electrically conductive material can have recesses or bulges, some of which are wedge-shaped, for example, or some of which comprise arcs of a circle.
- recesses or bulges some of which are wedge-shaped, for example, or some of which comprise arcs of a circle.
- the above-mentioned object is also achieved by a method for applying an electrical potential that causes electrical polarization to a surface of a conductive or non-conductive material, in particular a plastic material, with a first electrically conductive material extending at least partially parallel to the surface, in particular a metal wire, is subjected to an electrical potential, the potential being at least partially applied to the material via a second electrically conductive material which extends at least partially parallel to the surface, the second electrically conductive material having at least one electrical connecting line which connects the first electrically connect conductive material to the second electrically conductive material, brought to the electrical potential is at least partially brought, wherein the first electrically conductive material has a greater conductivity comprises as the second electrically conductive material.
- Fig. 1 Representation of an electrode arrangement
- FIGS. 1 and 2 show an electrode 100 according to the invention with a wire 101, which represents a first electrically conductive material.
- This wire 101 can be brought to an electrical potential with respect to the ground potential, ie zero, with a generator (not shown). This creates a voltage between the electrode and ground, which is advantageously more than 1 kilovolt (kV), preferably more than 10 kV.
- the wire 101 which preferably consists of one or more metals, can have a high conductivity, so that the electrical potential is the same at all points, even if electrical charges flow away.
- another configuration of the first electrically conductive material can also be used be provided, for example a rod or a tube, which are each rigid.
- a second electrically conductive material which has a lower conductivity than the first electrically conductive material, is arranged between the wire 101 and the material 102 .
- the second electrically conductive material is designed as a plate 103 in the present exemplary embodiment.
- This configuration means that its width B and its height H is significantly greater than the thickness D.
- the width B preferably extends parallel to the support 104 for the material 102, in the present example parallel to the axis of rotation 105 of the support configured as a roller.
- the height H can extend perpendicularly thereto.
- a preferred thickness of a plate is up to a maximum of 5 mm.
- the preferred height of a panel is between 1 cm and 20 cm.
- the preferred width of a panel is between 50 cm and 400 cm.
- the pad can also be brought to an electrical potential with the help of a generator.
- the support 104 is grounded.
- the plate 103 can be a plastic plate, for example, which has no or only minimal conductivity. This plastic plate can then be coated with a conductive substance or mixture of substances, for example vaporized, in order to enable surface conductivity.
- the plate 103 is connected to the wire 103 via one, but in particular via a plurality of connections 106 . These connections can be made of the same material as the wire 101. However, the connections can each have a lower conductivity than the wire 101 by having a smaller cross-sectional area than it and/or by comprising a different material.
- FIG. 2 also shows that the plate tapers in the direction of the material 102, for example in the form of a wedge 107. A high electrical field strength is thus created at the edge 108 .
- FIG. 3 now shows a so-called equivalent circuit diagram of a preferred embodiment of the electrode 100 according to FIGS. 1 and 2.
- the wire 101 is shown as a line, which means that it offers no electrical resistance to the electrical current. The same electrical voltage is therefore present at every point of the wire.
- the connections 106 include resistors R1 that create an electrical voltage drop.
- Plate 103 can be thought of as a series of resistors R2, with an injection point of connection 106 between each resistor R2.
- a resistance R2 means that an electric current cannot flow parallel to the pad 104 unhindered. This prevents local overheating and thus damage to the plate 103 and/or the material 102.
- FIG. 4 shows a further electrode according to the invention which is constructed like the electrode shown in FIG.
- the main difference is that the edges on which the connections 106 are arranged are now designed as recesses 109 .
- the electrical resistance caused by the plate 103 is changed with the recesses.
- a suitable design of the formations therefore influences the conductivity of the plate 103 within or along the plane spanned by it. This makes it possible to equalize the electric field strength at the edge 108 over the entire width B.
- FIG. 5 shows a side view of a further embodiment of an electrode 100 according to the invention.
- This initially comprises two insulator plates 120, 121, for example two glass plates.
- These insulator plates each carry a layer 130, 131, for example a glued film, and / or a coating, for example by means of vapor deposition or by means Sputter disposition was applied.
- the thickness of the layer or the coating is preferably a maximum of 500 nm.
- the insulator plates are arranged in such a way that the layer and/or coatings 130, 131 face one another and at least partially touch one another.
- the current or voltage supply is as well as in the im
- clamps can be provided, the clamp arms of which can be placed on the outside of the insulator plates and exert a force directed toward one another on the insulator plates.
- at least one screw connection can be provided, in which case the insulator plates can be provided with through openings, in particular through bores, through which a screw, a threaded rod, a bolt or the like can pass.
- the layer or coating is kept free of the layer or the coating in the area of the passage openings of the insulator plates 130, 131.
- this free space can also take place for other reasons and is therefore independent of the exemplary embodiment in FIG , when it rests on the insulator plate, is at a distance from the respective through-opening and/or the layer has a desired peripheral shape.
- the areas to be kept free can be masked before the coating process. After The masking must be removed again after the coating process so that areas that should remain free of the coating do not include any coating.
- FIG. 6 shows a structure of the electrode according to the invention which is similar to that in FIG.
- the insulator plates 120 and 121 have in their upper part bulges 140 and 141 which face one another and which respectively comprise the layer or the coating.
- the bulges which can be designed as bevels as shown, thus form a channel-like depression visible in the cross section shown, into which the wire 101 is inserted.
- the layers or the coatings 130, 131 now lie on top of one another over a large area.
- FIG. 7 shows a further exemplary embodiment of an electrode according to the invention, in which only the insulator plate 120 has a layer or coating 130 .
- This aspect of the invention can also be combined with all other exemplary embodiments shown in this disclosure.
- FIG. 7 shows a second aspect of the invention which can be freely combined with other exemplary embodiments. Accordingly, the second insulator plate 121 is connected to the first insulator plate 121 via an adhesive connection 150, so that a mechanical connection can be dispensed with.
- FIG. 7 shows a third aspect of the invention that can be freely combined with other exemplary embodiments. Accordingly, the second insulator plate 121 is reduced in size compared to the insulator plate 120 . On plateau 122 The wire 101 rests on the insulator plate 121 and makes contact with the layer or coating 130 . The wire 101 is insulated from the environment by an adhesive coating 152 .
- FIG. 8 shows an exemplary embodiment of the invention which is designed similarly to the exemplary embodiment in FIG.
- the wire 101 may be shielded from the environment by an adhesive coating 152 .
- FIG. 9 illustrates yet another embodiment of the invention in which the layers or coatings 130 and 131 are wrapped around the top inside edges 124 and 125 and thus extend onto the top surfaces of the insulator plates 120,121.
- the wire 101 can be in the form of a flat strip which touches both layers or coatings in an electrically conductive manner.
- the wire 101 can be shielded from the environment by an adhesive coating 152 .
- further insulator plates can be arranged between two insulator plates 120, 121, which can carry a layer or coating on one side or on both sides. In this way it is possible to further increase the electric field strength in the area of the edge 108 .
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021207758 | 2021-07-20 | ||
| PCT/EP2022/070242 WO2023001837A1 (de) | 2021-07-20 | 2022-07-19 | Elektrode und verfahren zum beaufschlagen einer oberfläche eines leitenden oder nichtleitenden werkstoffes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4387827A1 true EP4387827A1 (de) | 2024-06-26 |
Family
ID=82943126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22757212.0A Pending EP4387827A1 (de) | 2021-07-20 | 2022-07-19 | Elektrode und verfahren zum beaufschlagen einer oberfläche eines leitenden oder nichtleitenden werkstoffes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20250038489A1 (de) |
| EP (1) | EP4387827A1 (de) |
| CN (1) | CN117715741A (de) |
| WO (1) | WO2023001837A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024128638A1 (de) | 2024-10-02 | 2026-04-02 | Windmöller & Hölscher SE & Co. KG | Elektrode und ein Verfahren zum Beaufschlagen einer Oberfläche eines leitenden oder nichtleitenden Werkstoffs mit einem elektrischen Potential |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1112196A (en) * | 1964-08-26 | 1968-05-01 | Grace W R & Co | Apparatus for corona treatment of film |
| US3385966A (en) * | 1964-12-30 | 1968-05-28 | Union Carbide Corp | Corona discharge electrodes of opposing polarity rotatable about a common axis to treat polymer surfaces |
| US4575329A (en) * | 1984-01-09 | 1986-03-11 | Andreas Ahlbrandt | Electrode element for corona treater |
| JP2001284099A (ja) * | 2000-03-29 | 2001-10-12 | Toray Ind Inc | 放電装置およびこれを用いた物体の放電処理方法ならびに絶縁性連続体の製造方法 |
| JP4627373B2 (ja) * | 2001-02-06 | 2011-02-09 | 浜松ホトニクス株式会社 | プリント基板の表面処理装置 |
| EP1837113A1 (de) * | 2006-03-24 | 2007-09-26 | Siemens Aktiengesellschaft | Elektrodenanordnung und Verfahren zur funkenerosiven Bearbeitung eines elektrisch nichtleitenden Materials |
-
2022
- 2022-07-19 WO PCT/EP2022/070242 patent/WO2023001837A1/de not_active Ceased
- 2022-07-19 EP EP22757212.0A patent/EP4387827A1/de active Pending
- 2022-07-19 US US18/580,816 patent/US20250038489A1/en active Pending
- 2022-07-19 CN CN202280051310.9A patent/CN117715741A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN117715741A (zh) | 2024-03-15 |
| WO2023001837A1 (de) | 2023-01-26 |
| US20250038489A1 (en) | 2025-01-30 |
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