Stephan Fiedler
Kiefel GmbH
Sudetensraße 3
83395 Freilassing, Germany
Efficient welding technology
High-frequency welding joins thermoplastic materials safely and reliably. In medical technology, for example, it is used to manufacture blood and infusion bags and guarantees tight, uniform welds of the highest quality. It is ideal for PVC, PU and EVA and enables flexible and material-friendly connections, even with complex geometries, thanks to precise process control.
How high-frequency welding works
01
Molecules in motion
High-frequency welding requires a polar molecular structure of the material, such as that found in PVC or EVA. This structure allows the molecules to be set in motion by a high-frequency field.
02
Joining components
During the welding process, the joining components (films) are pressed together by cool electrodes in a welding press.
03
Warmth for the plastic
The high-frequency field (27.12 MHz) causes the molecules to rotate, which generates frictional heat. This heat melts the plastic from the inside, ensuring precise and even welding.
04
Coolign the material
After the RF energy is switched off, the welding press remains closed for a short time until the material has cooled down.
05
Forming of weld seams
This controlled heating and cooling process produces particularly high-quality, resilient and visually flawless welds.
Applications in medical technology
Blood and infusion bags
Secure transport and reliable storage of medical fluids.
Urine and drainage bags
High resilience and reliably leak-proof even with intensive use.
Special applications
Flexible bags for laboratory samples or medical components.
The right
machine solutions
We offer specially developed machines that are optimally adapted to high-frequency welding technology:
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Medical & Pharma
Germany
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