Plasma treatment of PE or coated metal bottle closures (caps) prior to labeling is one of Plasmatreat's standard applications.
In a single step, the plasma treatment removes lubricant residues left on the PE closures during the cold forming process. Simultaneous activation of the different material surfaces to be labeled ensures uniform, high surface tension. As a result, the same adhesive (e.g. casein-based) can be used for the entire label.
A specially adapted nozzle tool that complies with food industry hygiene requirements has been developed for tamper-evident seals.