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Due to recent developments in ultrasonic sealing, both continuous longitudinal seals and intermittent cross seals can now be integrated into one packaging system. When you seal packages with ultrasonics instead of heat, it is possible to save up to 30% in material and energy costs. Ultrasonic seals are narrower and packages require less headspace than with conventional heat-sealed packages. It is now also possible to use thinner laminate structures and lower cost based polymer sealant films.
Ultrasonic technology initiates the sealing process inside the seal joint, whereas with heat sealing heat is transferred from the outside to inside of the laminate. By melting sealants at the seal interface, the hot tack properties of film laminates are greatly improved. Ultrasonic creates heat only at the relevant area of the sealing interface. Ultrasonics also helps prevent thermal damage to the packaged product due to cold tooling.
The overall efficiency of the ultrasonic system outperforms heat-sealing due to the immediate system availability and utilization of cold tooling (no warm up required). Energy transfer is applied only during the sealing process. The need for cleaning is also reduced remarkably.
When comparing ultrasonic sealing with heat sealing, ultrasonic seals demonstrate higher mechanical strength even when product contamination occurs in the seal joint. Herrmann Ultrasonics, based in Bartlett, IL, has proven market experience in integrating ultrasonic sealing technology for high-speed packaging applications. For more, visit www.herrmannultrasonics.com.
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