Bosch utrasonic tech targets 'cold' packaging for confectionery goods

The vertical form fill and seal machine SVE2515WR uses a method for joining thermoplastic materials together by emitting acoustic vibrations that create a 'tight, strong seam for closures'.

Targeted at doy-style stand up pouches, as well as gusseted and pillow bag packaging formats, Bosch claims their ultrasonic technology is an alternative to heat sealing, and "can process conventional heat sealed packages, such as those composed of polypropylene and polyethylene film."​

In terms of cost savings, the German firm suggests that by removing the heating element in their sealing process, manufacturers can potentially reduce the thickness of the sealant layer of packaging film structures, thereby cutting costs for materials.

"Removal of the heating element also enables 'cold' packaging of sensitive products which is particularly useful in delicate confectionery," ​adds the Waiblingen-based firm, present at IPACK-IMA 2009 taking place in Milan, Italy this week.

Friction generates heat​

With the ultrasonic process, the packaging film is sealed with heat from friction generated by an oscillating tool, 'eliminating the need' for direct heat contact.

While products could melt and accumulate in the sealing zone when manufacturers use heat sealing systems, Bosch claims their ultrasonic process can seal film structures that have been "contaminated by products thereby minimising stoppages, and reducing downtime."​

Web material speeds​

The German firm, that clocked up €700m in turnover last year, suggests that its ultrasonic sealing technology, capable of web material speeds used on vertical form, fill and seal machines, could also lead to a reduction in sealing time.

"Seams can be immediately subjected to product load after joining, reducing processing times,"​ said Bosch.

Further, they claim it is more "precisely calibrated"​ than heat sealing, as operators "can adjust oscillating frequency"​.