Weld lid of resealable beverage cans with ultrasonic
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In order to ensure the highest quality of the resealable lids for the beverage cans To connect the plastic components of the opening mechanism with the aluminum of the lid, a joining process had to be found that works quickly and precisely and enables short cycle times for high throughput rates. After extensive testing, the choice fell on the systems for Ultrasonic welding from the house Telsonic.
The XO locking system of the Xolution GmbH, based in Munich, is suitable for all beverage can sizes. Unlike conventional beverage cans, which can only be opened once, the XO-sealed versions have a plastic opening mechanism with which the can can be resealed. In addition, a tamper-proof ribbon is attached above the slider.
It tears when opened for the first time and guarantees the consumer that the can has not been opened before. In order to connect the plastic components with the aluminum lid of the cans, a Joining process to find a solution that works quickly and precisely and enables short cycle times for high throughput rates. After all, the lids with the patented closure are already being delivered to the beverage industry worldwide in millions.
Fast and environmentally friendly process
After extensive testing, the joining technology was ultimately chosen to use ultrasonic welding systems from TelsonicThere were both technical and economic reasons for this:
In ultrasonic welding, an acoustic tool generates high-frequency sound waves. These cause the molecules of the parts to be joined to vibrate, which generates heat that breaks down the material boundaries and fuses the materials together. This creates high-strength connections that also 7 bar internal pressure of the beverage cans.
At the same time, the process is fast and environmentally friendly, as it does not require any additives and thus Recycling The process is reliable and safe because the welding process depends on only a few parameters that are easy to set and monitor.
The Parameter are the welding energy, force and time as well as the maximum power (PMax). In this way, in the first process step, four small pin domes are welded quickly and tightly to connect the inner and outer slides through the aluminum cover. In the second step, the tamper-evident band is then welded on.
MAG ultrasonic generator in focus
The ultrasonic equipment consists of four components that plant manufacturers can easily integrate: The ultrasonic generator, which generates the electrical High frequency vibrations generated, the converter, which converts these into mechanical vibrations, a booster for amplification and the sonotrode. The latter introduces the mechanical vibrations into the workpiece. Converter, booster and sonotrode are mechanically firmly coupled to one another and acoustically tuned to resonate with one another.
The Generator plays a key role, as it not only generates the electrical high-frequency oscillations, but also provides the connection to the higher-level automation technology in the spirit of Industry 4.0. For example, welding parameters can be adjusted and results read out in real time using the latest bus systems.
In addition, system costs can be optimized because it is possible to switch between different vibration units. The external setpoint specification for amplitude, time, energy and PMax, as well as soft start for large Sonotrodes and frequency autotuning are further features that ensure high process stability. The optimal connection technology has thus been found for the production of the can lids with the resealable XO closure.
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