Titelbild FOSTA Forschungsbericht P 1237Titelbild FOSTA Forschungsbericht P 1237

P 1237 – Extension of the process limits for wrinkle-free seaming of cans made of high-strength packaging steel




P 1237 – Extension of the process limits for wrinkle-free seaming of cans made of high-strength packaging steel

With the background of constantly decreasing resources and very high  production vol-umes in the billions, the topic of material savings is of  central importance in the packag-ing steel industry. The entire packaging  steel industry is faced with the economic and technical challenge of having  to process higher-strength tinplate alloys in a reliable man-ner. Within the  scope of this research project, it was investigated to what extent thinner,  higher-strength metal packaging materials can be processed reliably with  the seaming technology in particular for three-piece food cans.
Based on extensive literature research on the state of the art of seaming  technology for metal packaging and the expert discussion (interviews)  within the industrial working group accompanying the project, the main  influences on the seaming process have been detailed and evaluated.
With help of an FEM process model for the roll-seaming technology, the main influences were analyzed and subsequently an optimization for the  essential parameters was car-ried out. Based on a new criterion for the  wrinkle assessment (waviness and max. wrin-kle height) in the FEM results, comparability could be established and evaluated. Within the process  optimization, especially the profile geometry of the seaming roller OP1 was  changed. The profile height and the profile radii turned out to be the main  influences. The values for these parameters achieved within the  optimization showed a significantly better wrinkle behavior in the FEM  model and were subsequently tested in experimental trials on industrial  machines.
Within the experimental investigations at three different machine  manufacturers and one canmaker the improvement of the wrinkling with  the new tool geometries for the seaming operation OP1 could be practically  proven. The cans produced by the industrial partici-pants were given in   small quantities to the industrial measuring partner, who analyzed those  with regard to wrinkle formation using a new non-destructive measuring  principle. In the analysis of the results for all the materials investigated, it  was possible to prove that with the optimized process parameters and tool  geometries, a significant improve-ment in wrinkle formation occurs for all  manufacturers.
Within the investigations on the functionality of the seamed cans, the  buckling test was carried out. From a small quantity sample, it can be  concluded that all materials with a higher strength have the potential for  functional improvement. However, it can also be stated that materials with   a high strength and a high elongation have a greater potential for improving the functionality of the can than materials with a pure strength increase.

Main content only available in german language.

Published in:
August 2020

Prof. Dr.-Ing. W.-G. Drossel
Dipl.-Ing. T. Lieber
Dipl.-Ing. Dipl.-Wirtsch.-Ing. M. Nagel