Ultrasonic roll seam module with cantilevered sonotrode

The cantilevered SONOTRONIC roll seam module is particularly suitable for continuous sealing and weld separation without interfering contours in the packaging industry. The roll seam module can also be integrated in existing or new machine concepts.

An ever expanding application for the continuous ultrasonic sealing method from SONOTRONIC lies in packaging technology.

Here ultrasonic roll seam technology is applied mainly in horizontal and vertical tubular bag machines. Bags with four sealed edges can also be produced by ultrasonic roller seam sealing.

Both the roll seam sonotrode and the anvil are driven in this process so that there is neither slip nor wave formation in the film. No relative movement is generated between the sealing wheel and film by the double drive either.

In addition to the proven roller seam sonotrodes mounted on both sides, SONOTRONIC has now also developed special unilaterally mounted roll seam sonotrodes. In the case of horizontal tubular bag machines the roll seam sonotrode with unilateral mounting can be assembled directly underneath the filled bag.

In addition to the well known advantages of ultrasonic sealing, such as tight sealing of wetted surfaces, optically attractive seams and consistent sealing results, ultrasonic roll seam technology is also characterised by further advantages. In continuous sealing, no thermal radiation is transmitted to the product, which is particularly advantageous in the case of heat-sensitive products such as chocolate.

Unlike thermal methods, ultrasonic technology also enables mono-films to be used because no heat insensitive outer layer need be laminated onto the film. Furthermore, very thin polymer films (15 μm) of high quality can also be sealed by the continuous ultrasonic method, which has not hitherto been successful with thermal sealing systems.


  • Continuous sealing seams
  • Tight sealing seams even on product wetted surfaces
  • No thermal radiation to damage the product or film
  • Assembly directly underneath the bag
  • Sealing of mono-films and very thin films (15 μm) possible
  • No slip or saving of the film
  • Use in VFFS and HFFS machines and for bags with four sealed edges
  • Environmentally friendly and energysaving

Technical data:

Welding width [mm]
2 - 9
Max. welding force [N] 250
Max. speed [m/min] 80
Frequency [kHz] 35
Power of the generator [W] 400
Max. air pressure [bars] 6
Electrical connected loads of the drive [V] / [A] 230 / 4
Dimensions of the module W x H x T [mm] 250 x 428 x 127

Subject to alterations.

For further information, please contact the person alongside.