For packaging with thermoplastic sealing layers, such as capsules, pouches, drink cartons, cups and trays, ultrasonic sealing provides a large number of options: above all, high cycle rates and tight seals despite potential product residues in the seal area. This technology is used for sealing plastics as well as laminating nonwoven materials found in certain types of food packaging.
Ultrasonic sealing of food packaging fulfills all criteria of process optimization and validation crucial to companies in this sector. Herrmann Ultrasonics is ready to provide you with full expertise to implement and integrate this equipment into your operations.
Sealing of lid films, welding of seal rings and embedding of filters are the most important applications for which ultrasonic welding provides a solution. The weld tools hold the film in place by means of vacuum. Shelf life and product protection are ensured due to the tools being cold.
With ultrasonics, fast and safe welding of injection molded degassing valves or spouts on films of any type is possible. Film shrinkage is prevented and the barrier properties are not jeopardized since ultrasonics only excites the molecules in the actual sealing layer. Moreover, ultrasonics allows for safe integration of zippers for re-sealable pouches and welding of the zipper ends (zipper-crushing).
With ultrasonics it is possible to safely push product residues out of the seal area, which ensures absolutely tight sealing. This significantly reduces the number of leaking packaging and shelf life of the products in the supermarkets is increased. Ultrasonics provides this advantage for stand-up pouches, chained bags and bags, both at longitudinal and transverse joints, in intermittent and continuous applications.
Ultrasonic welding is very well suited for coated carton packaging material. Despite wetting with filled products, tight seals are ensured with or without aluminum barrier. Integration of spouts is easily possible. High output due to short sealing times. Repeatable parameters ensure consistently high sealing quality.
Clean cuts without deforming the product: this is easily possible with ultrasonic. The sonotrode precisely separates the food without leaving any remains on the welding tool. This also prevents any smearing, resulting in a optically perfect result. As a result, you not only increases the quality of your products, but also reduce waste and therefore your costs.
On PET applications in particular, ultrasonics quickly reaches the high melting point and therefore results in an increase in production output. Sealing and separating blister packs is easily possible, also integration of tear out sections and tamper-evident seals.
- With ultrasonic sealing, packages are sealed 100 % tightly even if there are residues of the contents in the seam area.
- In the sealing process, the vibrations of the ultrasonics displace these residues reliably from the sealing zone – regardless of whether the contents are solid, moist or liquid.
- This significantly reduces rejects and at the same time extends the shelf life of the products.