The ultrasonic welding technology and its benefits
Ultrasonic sonotrode table
The table is segmented into single and flat sonotrode blocks. Shapes and sealing seam lines can be placed individually across any place within the whole sealing area. The sonotrode table is fixed in the machine and its whole format width can universally be used by simple welding tool change. Different product shapes result from the welding tool design and not from the sonotrode.
Short set-up and change-over times
The tools are simply pushed in and out of the welding press and locked into precise positions. The set-up of new products is very easy as the tools can be changed within minimal time and effort. Long standby times waiting for the tooling to heat up are not applicable. Therefore the ultrasonic welding technology is referred to as a "cold" welding system.
„Cooled sealing" means no wrinkles in the material, therefore you get extremely flat and strong welded seams with a noticeable higher visual quality. Similar to HF welding, ultrasonic sealing is a method of heating the film on seam area from the inside by
creating a high frequency mechanical vibration. Thermal contact sealing supplies heat from the outside and therefore the heat has to be higher than the melting point of the material. This leads to overheating and causes strong wrinkles in the material.
cold welding tools avoid film damage during machine stop.
Ultrasonic sealing of PP, PVC, PE, PET, nonwoven and barrier foils – there is no difference, with impressive results.
Performance adjustment depending on exercises with 20, 30 or 35 kHz technology
Digitally controlled sealing process
enables simple reproducibility of production parameters and therefore quick product change. Quality control of every welding with
energy measurement (min/max) High production cycle times nearly independent of film thickness (up to 200 cycles per minute).
Low energy requirement
Thermal contact welding technology requires permanent maximum energy as the welding tools always have to be kept at a constant temperature. Therefore the created temperatures are higher than the actual required melting temperature. With Ultrasonic the welding happens in only one process step and energy input happens in a split second during the effective welding time.