A high quality sealing is a basic requirement to accomplish all functions of a package. By using ultrasonic sealing, these quality standards can be reached even under difficult conditions. The behavior of the polymer melt is a significant factor for good sealing quality. At present, the effects of the energy transformation mechanisms and the influence and relationships of material parameters with regard to the sealing quality are not completely understood yet. Based on the former investigations about the warming behavior, these topics will be further researched in this project.
To characterize the mechanisms of the ultrasonic process, the flow behavior of different packaging materials is analyzed. Investigations about the crack propagation within the sealing seam are planned, to be able to give conclusions about the behavior of the melt.
Based on the first results, the behavior of different ultrasonic sealed materials is analyzed on the basis of process data, to be able to narrow the process window with regard to best sealing parameters. For practice-oriented suggestions about an effective process control, the sealing results in dependence to the material properties and different process controls are investigated.
Furthermore, a discussion about the phenomena which could be observed in the presence of the interaction between the melt and the solid polymer gives more insights about the behavior of the melt.
As a result of the project, a better process control is feasible and suggestions for an optimal tool design could be given. Moreover, the process behavior of different packaging materials could be estimated.
The IGF project presented here by the Research Association of the Industrial Association for Food Technology and Packaging (IVLV e.V.) is funded by the Federal Ministry for Economic Affairs and Energy via the AiF as part of the program for the promotion of industrial community research (IGF) based on a decision of the German Bundestag.