A process for making perforations in a plastic film material to be used in a package for products prone to decay, in which the surface area of the perforations made in a defined surface area of the plastic film material must have a predetermined value, which process has the following steps: A. The layer is formed by providing a plurality of flowable regions on the substrate, spreading material in the flowable regions, and contacting the regions with a plurality of imprint lithography molds that are disposed on a template. The camera and light source may be mounted in a permanent position using a gantry or another suitable system where the vehicle travels across the camera and light system in a determined manner, for example through a vehicle track.