High-frequency stranded wires are used wherever electrical energy needs to be transmitted efficiently at higher frequencies. In practice, it is not only the internal structure of the stranded wire that determines its performance, but also the quality of the external insulation.
As soon as high-frequency stranded wires are used in transformers, inductors, charging units, power electronics or other compact electrical assemblies, the requirements increase significantly. Then it is no longer just a question of electrical isolation, but of a stable overall system that can permanently withstand thermal, mechanical and process-related loads.
In our view, the following points are particularly important:
- high continuous thermal load
- safe electrical insulation with limited installation space
- mechanical stability during winding, bending and assembly
- Resistance to chemical and process-related influences
- reliable processing in sample and series processes
This makes the insulation layer a real development issue, especially for demanding applications.
What makes Zenimid an interesting option for high-frequency cables
Zenimid™ is a Polyimide film film designed for applications with high thermal, mechanical and electrical requirements. The material is particularly suitable for high-frequency cables where standard solutions reach their limits in terms of temperature, size or process reliability.
The following characteristics are particularly relevant when designing such applications:
- extreme temperature resistance and dimensional stability
- good electrical insulation properties
- high mechanical flexibility combined with good strength
- inherent flame resistance
- low outgassing
- chemical resistance
For us at CMC Klebetechnik, this is crucial:
These properties do not automatically make a material the best solution for every HF stranded wire. Relevant is a Polyimide film like Zenimid™ whenever several requirements have to be met at the same time and the insulation needs to do more than just provide separation. This is precisely why a good solution does not start with the material alone, but with the technical classification of the application.
Not every high-frequency stranded wire requires a high-performance film. Polyimide film is particularly relevant where electrical, thermal and mechanical requirements increase simultaneously.
High temperatures during operation
In power electronics, inductive charging systems, transformers or compact winding goods, high local temperatures sometimes occur. If the outer insulation loses its mechanical or electrical properties, this jeopardizes the reliability of the entire assembly.
CMC Klebetechnik has been processing polyimide films for high-temperature applications for many years and offers corresponding solutions as technical films, adhesive tapes, laminates and die-cut parts.
In our experience, it is particularly important in this context not to treat thermal stability and electrical safety as separate issues. This is precisely where Zenimid can be of interest: when high temperature margins are required in conjunction with an insulation structure that can be processed with precision.
Tight installation spaces and thin superstructures
The more compact an assembly becomes, the more important it is to have an insulation solution that functions reliably with a low thickness. For developers, this means that the insulation layer should take up as little space as possible, while at the same time ensuring electrical safety and mechanical robustness.
Particularly when it comes to high-frequency wires in compact assemblies, thin, precisely defined structures are a key factor in ensuring functionality and manufacturability. A polyimide film such as Zenimid can be a useful solution in such cases, where thermal and electrical requirements can no longer be reliably met using simpler materials.
For us, it is crucial that not only the film itself fits, but also the subsequent packaging, handling and integration into the customer process.
Increased electrical load
In many applications, it is not just about temperature or installation space, but also about additional electrical safety. When dielectric strength, dielectric safety and process-capable insulation have to come together, the relevance of the selected film material increases significantly.
In such cases, a good polyimide film can help to build up safety reserves without unnecessarily enlarging the overall structure. From our point of view, this is particularly relevant for assemblies in which insulation and installation space efficiency compete directly with each other. In such cases, it is not only the material itself that counts, but also its suitability for a stable, reproducible design.
Series-capable processing
A material can be convincing on the data sheet and still cause difficulties in production. What counts in industrial practice is whether a film can be cleanly cut, laminated, bandaged, punched or integrated using adhesive technology.
It is precisely at this point that a theoretically suitable film is separated from a functioning solution. From our point of view, this is one of the biggest levers in the development process: an insulation solution must not only be technically efficient, but must also function reliably in prototyping, pre-series and later series production.
What CMC Klebetechnik actually does for such applications
Anyone laying out high-frequency stranded wires with foil insulation usually needs more than just a catalog of materials. The decisive factor is how a material can be translated into a robust and economical process.
CMC Klebetechnik not only supplies technical films, but also develops adhesive tapes, laminates, roll goods and die-cut parts for electrical and thermal applications. At the same time, we adapt standard solutions to specific applications as required, for example through material combinations, delivery forms or adapted adhesive structures.
This is particularly valuable for projects with high-frequency stranded wires in four phases:
Rate material
The initial question is not which film is generally best, but which requirements must actually be met. Temperature class, electrical load, mechanical stress, media contact and processing route must be considered together.
Design structure
Whether roll goods, bandageable material, cut-to-size or die-cut parts make sense depends on the customer's process. A good solution therefore takes into account not only the material, but also the format, layer structure and handling.
Sampling and process coordination
There are often several loops between the laboratory sample and the clean series production process. This is precisely where the benefits of a partner who not only supplies material but also provides support during testing, adaptation and optimization become apparent.
Safe transfer to series production
Tolerances, release material, adhesive system, die-cutting or delivery form influence whether a solution is stable in the field. We consider these points at an early stage and thus help to avoid friction losses in procurement and production later on.
Conclusion
Zenimid™ is particularly suitable for high-frequency cables where thermal stability, electrical insulation, mechanical flexibility and a compact design are all required. This makes the film an attractive option for demanding applications in power electronics, the automotive sector, medical technology and industrial winding products.
However, the choice of material alone is not enough to ensure success in practice. Only when the film, adhesive, assembly and processing are perfectly matched can a solution be created that also works reliably in series production. This is precisely where CMC Klebetechnik brings its added value: as a partner for material selection, sampling, application-oriented assembly and the transfer to stable production processes.
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Zenimid™ for high-frequency cables: When polyimide film has to do more than just provide insulation