Effects of Corona Treatment on Surface of Aluminum Foil for Retort Pouch

Retort  pouch  is  one  kind  of  flexible  packaging  which  made  from  plastic  
film or aluminum foil laminating together.  Generally, retort pouches will use adhesive to combine each layer of film or foil together. If the lamination between each layer is not good enough, the 
delamination of each layer might be occurred. Therefore, the effects of corona treatment on surface of aluminum foil for retort pouch (PET/Al/CPP) were studied.  This research was aimed to compare 
bond strength ability of Al/CPP layer, seal strength and tensile strength of laminated film 
(PET/Al/CPP) both before and af- ter sterilization.  Moreover, it was aimed to compare the shelf life of laminated film (PET/Al/CPP) that held ketchup and tuna for a period of 7, 14, 21 and 30 days. There were five samples used in this experiment, the laminated film without corona treatment on Al surface and the laminated film with corona treatment on Al surface at 2, 2.5, 3 and 4 kW. The 
results showed that the laminated film with corona treatment (in all lev- els) on aluminum surface 
had higher bond strength, seal strength and tensile strength than the laminated film without corona treatment on aluminum surface. The results of the shelf life of laminated film (PET/Al/CPP) that 
held ketchup and tuna for a period of 7, 14, 21 and 30 days showed that the bond strength ability of the film without corona treatment on aluminum decreased and the laminated film was delaminated 
on Al/CPP layer. In a way, the bond strength ability of laminated film with corona treatment (in all levels) on aluminum slightly decreased.  It was also indicated that the level of voltage on corona treatment did not statistically effect on bond strength ability of Al/CPP layer,
seal strength and tensile strength of laminated film (PET/Al/CPP).

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