Comparison of the influence of mechanical stresses on the barrier properties between metallized plastic films and aluminium foil/plastic laminates

: Probst, C.; Schricker, G.; Teichmann, W.

Abstract
In the present study it was investigated, how mechanical stresses may influence the barrier properties of metallized plastic films in comparison to aluminium/plastic laminates. For this purpose the films were processed on vertical form, fill and seal machines. The pouches were filled with silicagel and some were further stressed on a vibration table. The influence of mechanical stresses was examined by a phinole test and also by determination of the water vapour transmission rate. These values were compared with the water vapour transmission rate of the films before processing. The results of the study show a considerable barrier loss for the metallized films, while the aluminium/plastic laminates were much more stable against the mechanical stresses.