Method for the production and filling of containers designed to contain food

A method for the production and filling of containers designed to contain food, the method including the following steps:

• shaping a sheet made of PET (polyethylene terephthalate) in order to provide a plurality of accommodation receptacles provided with at least one access inlet, said PET sheet having an initial degree of crystallinity lower than or equal to 10%,
• filling, through said access inlet, said accommodation receptacles with at least one food,
• sealing said at least one access inlet by means of a closure film, and
• providing a weakened portion at a connecting edge between at least two adjacent accommodation receptacles, said provision step comprising a step of emission of laser radiation at at least one portion of said connecting edge in order to provide a localized reduction of a transverse cross-section of said connecting edge along said weakened portion;
• a final degree of crystallinity at said weakened portion after said step of emission of laser radiation being lower than, equal to or greater than, at most by a percentage equal to 3%, a degree of crystallinity of portions of said connecting edge not affected by modifications occurring as a consequence of said step of emission of laser radiation and of said sealing step.