EP4226436A2 - Verfahren zur herstellung eines beschichteten, verspannungsfreien trägers - Google Patents
Verfahren zur herstellung eines beschichteten, verspannungsfreien trägersInfo
- Publication number
- EP4226436A2 EP4226436A2 EP22714372.4A EP22714372A EP4226436A2 EP 4226436 A2 EP4226436 A2 EP 4226436A2 EP 22714372 A EP22714372 A EP 22714372A EP 4226436 A2 EP4226436 A2 EP 4226436A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- carrier
- paste
- coating
- particles
- drying
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000758 substrate Substances 0.000 title abstract 7
- 239000011248 coating agent Substances 0.000 claims abstract description 43
- 238000000576 coating method Methods 0.000 claims abstract description 43
- 239000002245 particle Substances 0.000 claims abstract description 43
- 238000001035 drying Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 239000011888 foil Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910002804 graphite Inorganic materials 0.000 claims description 8
- 239000010439 graphite Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 5
- 229910001416 lithium ion Inorganic materials 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000007900 aqueous suspension Substances 0.000 claims description 4
- 239000011889 copper foil Substances 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/78—Shapes other than plane or cylindrical, e.g. helical
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/025—Electrodes composed of, or comprising, active material with shapes other than plane or cylindrical
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the invention relates to a method for producing a coated carrier according to the preamble of claim 1.
- Manufacturing methods for such carriers are known from the prior art, for example in connection with the manufacture of batteries, in particular the manufacture of negative electrodes coated with graphite particles for lithium-ion batteries. Manufacturing methods of this type for negative electrodes are disclosed, inter alia, in US 2014/0072076 A1 or WO 2018/047054 A1.
- the carrier film is coated with the appropriate paste and transported from step to step as part of the further manufacturing process. Finally the paste is dried on the carrier. If necessary, intermediate steps are carried out before or during drying, such as aligning any particles contained in the paste.
- Graphite particles can be aligned in the paste, for example, in a temporally or spatially changing magnetic field.
- a double belt press is used after coating in order to compress the active material of the coating and at the same time to compensate for the bulging by introducing the load.
- the object of the invention is to be able to provide a production process for coated carriers that has a improved, in particular better aligned, transport of the carrier through the system during manufacture.
- the object is achieved by the characterizing features of claim 1, based on a production method of the type mentioned at the outset.
- the production method according to the invention also initially includes the basic process steps, namely the provision of a carrier and the paste or the dry coating with which the carrier is coated, the coating or application of the paste or dry coating on the carrier and a subsequent drying / solidification process.
- the carrier includes a foil as the basic
- the manufacture of negative electrodes for lithium-ion batteries uses copper foil that comes in long strips.
- the carrier can be deformed in an undesired manner, for example during drying.
- the transport of long webs of film in a straight orientation is difficult under these conditions.
- the invention reduces these difficulties during transport by avoiding or counteracting mechanical stresses in the film. Mechanical stresses in the film can cause the carrier material to bend or deform.
- the cause is the tension caused by the shrinking paste during drying, since the paste applied to the film is already in mechanical contact with the film and is adhering to the film.
- the foil does not change size, or changes very little, during drying of the paste.
- the carrier will buckle.
- the film can arch transversely to the transport direction.
- the invention therefore makes it possible, in contrast to the prior art, to counteract the cause or the basic geometric conditions of the deformation, which is seen in particular in connection with the drying process, or the associated bulging effect, without the carrier being subjected to additional mechanical stress through the introduction of loads is suspended over a larger area by rigid clamping on both sides.
- the paste with which the carrier film is coated can contain platelet-shaped particles in which, for a majority of the particles, an ellipsoid approximating the respective particle shape has two axes of similar length and one significantly shorter axis.
- the paste with which the carrier film is coated for example, can contain spherical particles in which, for a majority of the particles, an ellipsoid approximate to the respective particle shape has three axes of similar length.
- the paste with which the carrier film is coated for example, can contain needle-shaped particles in which, for a majority of the particles, an ellipsoid approximate to the respective particle shape has a long axis and two significantly shorter axes.
- the alignment of the particles can lead to a direction-dependent volume reduction during drying and thus, in contrast to non-aligned particles, a stronger or weaker one Foil tension.
- the coating can also be a thermoresponsive material.
- a dry coating eg with a powder
- a hardening process can lead to distortion of the carrier, as can other ambient temperature changes during transport.
- a dry coating can also have particles that can be aligned in the force field.
- the invention solves the problem by a more general measure that can be used advantageously even when the composition of the paste itself does not allow to reduce the shrinkage and the associated stress.
- the carrier is preformed in such a way that a distortion of the carrier is counteracted by shrinkage of the coating.
- the carrier is first deformed in such a way that a subsequent deformation of the carrier largely or completely compensates for this deformation.
- This shaping of the carrier is advantageously carried out before and/or during the drying process or the process which can lead to the strain
- Particles in the paste can be oriented, for example, under the influence of a force field.
- Graphite particles can be oriented, for example, in a magnetic field, in particular a temporal and/or spatial alternating magnetic field. If there are particles in the paste that are oriented, this process is advantageously carried out before and/or during the drying or the solidification process, since the particles in their environment, for example in the completely dried and solidified paste surrounding them, usually hardly move mechanically let move.
- the orientation of the particles can partly be carried out at the same time as the drying process, so that the orientation of the particles is not completely or partially lost again (for example under the influence of shrinkage).
- the preforming of the film or the carrier during alignment or more generally, in a time interval from the start of alignment to the end of drying.
- the carrier film can usually be in the form of a film web.
- a deformation as a result of a shrinkage of the applied paste volume perpendicular to the longitudinal axis of the film web in the plane of the film web can typically make itself felt in the form of a bulging of the film surface.
- the carrier is curved beforehand to compensate for the coating, i.e. two imaginary connecting lines between two points within the plane of curvature on the carrier run outside the coating, or vice versa, away from the coating. This makes it possible, in particular, to be able to improve the lateral guidance of the carrier in the system.
- the coating in one embodiment of the invention includes a material with thermoresponsive properties that is added to the paste, or the paste already includes such a material has or consists of. In this way it can also be achieved that when the paste is heated, the coating hardens without a volatile component in the coating being removed in the process.
- the particles to be aligned are fixed at the same time. If the particles were oriented in the force field, the alignment of the particles can be better preserved despite the heat that affects the paste during drying.
- the fact that the particles in the force field are aligned perpendicularly to the direction of transport can also have an effect, since this can also influence the deformation during drying of the paste.
- the orientation that the particles are to receive is predetermined and therefore does not necessarily have to reduce the strain.
- a force field for aligning particles in a paste can be present, for example in the form of a spatially and/or temporally varying magnetic field. If a locally changing magnetic field is provided, the magnetic field changes over time from the perspective of a continuously moving carrier that is moved relative to the magnetic field. Such a variable magnetic field ensures that the platelet-shaped graphite particles are oriented.
- the process is particularly suitable for the production of graphite-coated, negative electrodes for lithium-ion batteries.
- current collector foils in the form of copper foils, e.g. with a thickness of 6 ⁇ m to 15 ⁇ m, typically 8 ⁇ m or 10 ⁇ m, are used in one embodiment variant.
- the paste can be applied to the carrier as an aqueous suspension.
- a dry coating can be applied as a powder, for example.
- the carrier foil is preformed by guiding the foil over a correspondingly shaped surface during transport, eg over a surface curved transversely to the transport direction, which causes the surface to curve. It is also conceivable that, for example, Positioning the carrier film in the edge region causes the carrier film to be shaped, for example by moving opposite bearings closer together or by arranging the storage receptacle or storage opening, into which the carrier film to be stored engages, at an angle, so that the surface of the carrier film is curved.
- Particles in the paste or in a dry coating can be aligned via a force field, in particular a magnetic field.
- the carrier can be pre-shaped during drying or beforehand.
- the alignment of the particles is usually started before or to some extent during the drying process. If the carrier is already pre-formed during the alignment of the particles, it is advantageous to arrange or set the elements that generate the force field in such a way that the distance between the field-generating elements and the paste remains constant or the field in the area of the paste (in an area of the paste along the carrier surface perpendicular to the transport direction) remains constant in each case.
- Fig. 1 a schematic representation of a carrier film with a curved surface after drying and with preformed surface as compensation like, the invention, as well
- Fig. 2 a schematic representation of a
- a carrier 1 is shown first, which is a film
- the coating 2 would shrink in terms of its volume. With increasing hardening of the coating 3, the paste would therefore exert a force on the film 2. As shown in situation II, the foil 2 would be increasingly tensioned and would arch, in particular along its width (perpendicular to the transport direction T). The curved foil 2 is then difficult to align, which can make transport and possibly processing, in particular the alignment of particles in a force field, more difficult. If a lateral guide is used, the lateral part can slip out of this guide at the edge of the foil 2.
- situation III on the other hand, in contrast to situation II, the carrier film 2 is already deformed, for example during drying, and in contrast to II in the opposite way Direction. This curvature is correspondingly eliminated by the drying process, so that the completely coated and dried support again forms a flat surface, as is shown in situation IV.
- FIG. 2 shows a schematic representation of a coating device 30 for coating a film or a carrier 1.
- the film or the carrier 1 is provided with paste in the application station 31 and then fed to a drying module 32 for drying the paste in the transport direction T.
- the drying module 32 includes a specific number n of individual stations 32.1, 32.2, ..., 32.nl, 32.n, which are connected in series.
- the carrier 1 runs back again, reversing direction, for example in order to be coated on the other side.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021105657.8A DE102021105657A1 (de) | 2021-03-09 | 2021-03-09 | Verfahren zur herstellung eines beschichteten, verspannungsfreien trägers |
| PCT/EP2022/056013 WO2022189492A2 (de) | 2021-03-09 | 2022-03-09 | Verfahren zur herstellung eines beschichteten, verspannungsfreien trägers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4226436A2 true EP4226436A2 (de) | 2023-08-16 |
Family
ID=81325930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22714372.4A Withdrawn EP4226436A2 (de) | 2021-03-09 | 2022-03-09 | Verfahren zur herstellung eines beschichteten, verspannungsfreien trägers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20230117986A1 (de) |
| EP (1) | EP4226436A2 (de) |
| JP (1) | JP2024511713A (de) |
| CN (1) | CN116982166A (de) |
| DE (1) | DE102021105657A1 (de) |
| WO (1) | WO2022189492A2 (de) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006002550A1 (en) | 2004-07-07 | 2006-01-12 | Nortel Networks Limited | System and method for mapping symbols for mimo transmission |
| JP4274090B2 (ja) | 2004-09-17 | 2009-06-03 | ソニー株式会社 | 黒鉛粉末および非水電解質二次電池 |
| CN103250277B (zh) | 2011-02-18 | 2016-02-17 | 株式会社东芝 | 电极的制造方法及电池的制造方法 |
| WO2012124033A1 (ja) * | 2011-03-11 | 2012-09-20 | トヨタ自動車株式会社 | 非水電解質二次電池とその製造方法 |
| DE102011088824A1 (de) | 2011-11-30 | 2013-06-06 | Volkswagen Ag | Elektroden für Lithium-Ionen-Batterien und ihre Herstellung |
| EP2793300A1 (de) | 2013-04-16 | 2014-10-22 | ETH Zurich | Verfahren zur Herstellung von Elektroden und mit einem solchen Verfahren hergestellte Elektroden |
| DE102013207353A1 (de) | 2013-04-23 | 2014-10-23 | Thyssenkrupp System Engineering Gmbh | Verfahren zur Herstellung einer Elektrode und Elektrode für eine Energiespeicherzelle |
| WO2018047054A1 (de) | 2016-09-06 | 2018-03-15 | Battrion Ag | Verfahren und einrichtung zur applizierung magnetischer felder auf einem gegenstand |
| JP6838480B2 (ja) * | 2017-04-26 | 2021-03-03 | 株式会社豊田自動織機 | 電極の製造方法 |
| DE102017215143A1 (de) | 2017-08-30 | 2019-02-28 | Bayerische Motoren Werke Aktiengesellschaft | Elektrode und verfahren zur ihrer herstellung |
| DE102019100476A1 (de) | 2019-01-10 | 2020-07-16 | Bayerische Motoren Werke Aktiengesellschaft | Kollektorfolie sowie Verfahren zum Herstellen einer Kollektorfolie |
| DE102019118111A1 (de) | 2019-07-04 | 2021-01-07 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zum Herstellen einer Elektrode |
| CN111509187B (zh) * | 2020-05-27 | 2023-02-28 | 苏州清陶新能源科技有限公司 | 一种锂离子电池复合正极的二次涂覆工艺 |
-
2021
- 2021-03-09 DE DE102021105657.8A patent/DE102021105657A1/de not_active Withdrawn
-
2022
- 2022-03-09 JP JP2023552570A patent/JP2024511713A/ja active Pending
- 2022-03-09 EP EP22714372.4A patent/EP4226436A2/de not_active Withdrawn
- 2022-03-09 WO PCT/EP2022/056013 patent/WO2022189492A2/de not_active Ceased
- 2022-03-09 CN CN202280019327.6A patent/CN116982166A/zh active Pending
- 2022-11-23 US US18/058,303 patent/US20230117986A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20230117986A1 (en) | 2023-04-20 |
| DE102021105657A1 (de) | 2022-09-15 |
| JP2024511713A (ja) | 2024-03-15 |
| WO2022189492A3 (de) | 2022-11-03 |
| CN116982166A (zh) | 2023-10-31 |
| WO2022189492A2 (de) | 2022-09-15 |
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