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How it Works: Radiofrequency and Thermocontact Welding

Jun 23, 2021 | Bag Forming

Radiofrequency Welding

Radiofrequency (RF) welding, also known as high-frequency welding, is an effective sealing process for the manufacture of medical bags such as ostomy bags, urine bags, and blood bags.

Radiofrequency welding works through the simultaneous application of a pressure force and an electromagnetic field with a frequency of either 27.12, 13.56, or 40.68 MHz on materials (for example, two films of PVC), which causes the material to melt, and the molecules to bond. This process makes the material weldable at relatively modest temperatures (for example, 30˚C) and results in a robust seal that is leak-proof and consistent.

Why use RF Welding?

RF welding results in a strong, leak-proof bond without the use of additional materials such as adhesives. The welds are durable, consistent, and ensures the integrity of the bag, which is crucial for pharmaceutical products. RF welding optimizes energy consumption, does not generate fumes, and does not require the use of additives. These aspects are beneficial for both operators and environmental protection.

RF Welding can be performed on materials including polyvinylchloride (PVC), polyurethanes, polyethylene terephthalate (PET), and acrylonitrile butadiene styrene (ABS).

Thermocontact Welding

Thermocontact welding uses external heat and pressure to bond materials. Thermocontact welding can be a good alternative when materials are not suitable for RF welding. Materials for thermocontact welding include polypropylene (PP), polyethylene (PE), and PVC-free plastics.