Flexible packaging represents a reality under a strong growth. Just think about the United States, whereas this is second in the hit list of the most utilized packaging means, according to a recent survey disclosed by the Flexible Packaging Association. 

The reasons of this success are to be searched in the peculiarity of this kind of packaging: its   ease adaptation to a wide variety of filling processes, its low weight, convenient price and eye-catching printability.

Technological innovation involving the flexible packaging widens the possibilities and permits to create intelligent packages reacting to outside stimulations; so, for instance, we can find polypropylene and polyethylene films changing colours when deformed or suffering for sudden temperature variations, so ensuring the integrity of the products reaching the consumers. This technique consists in incorporating fluorescent molecules in the film that, in case of deformation or excessive heating, break out thus producing the easily recognizable colour variation.