Torsional welding is particularly effective when processing the thinnest PTFE (polytetrafluoroethylene) membranes. Why? Here is a brief comparison that highlights the advantages and differences to conventional longitudinal welding.

Processing:
  • Torsional welding: The patented torsional sonotrode from MS Ultrasonic processes very thin membranes and films particularly gently. The rotating movement minimises the load on the joining components and prevents damage.
  • Longitudinal welding: Vertical vibrations are used here, which cause a higher mechanical load and can damage sensitive materials such as PTFE membranes.
 Strength:
  • Torsional welding: thanks to the high frequencies (20-35 kHz) and gentle friction, a robust melt is created between the joining partners. This results in high-strength and dense weld seams, ideal for applications that require absolute reliability.
  • Longitudinal welding: While it also produces strong joints, the increased stresses and temperatures can lead to material deformation and micro-cracks, which can compromise tightness.

 Wide range of applications:

  • Torsional welding: Particularly suitable for sensitive applications such as pressure equalisation elements, degassing valves and medical drip chambers. This method minimises the notch effect and material thinning, which preserves the integrity of the thin PTFE membranes.
  • Longitudinal welding: Can be used in many ways, but reaches its limits with sensitive materials.
Summary:
Both welding methods have their specific advantages. While torsional welding stands out particularly with sensitive materials such as PTFE membranes, longitudinal welding remains a reliable and versatile method for numerous applications. The choice of the appropriate technique depends on the specific requirements of your application.

Would you like to find out more about which welding process is suitable for your requirements? Visit our website or contact us.

torsional vs. longitudinal welding