Process for obtaining blow molded plastic containers

A process for forming a blow molded plastic container for carbonated beverages, which comprises:

• forming a first blow molded plastic precursor by blow molding said first precursor from a preform, said first precursor having a shape and wall thickness and including an external wall with an inner and outer surface and with an internal cavity and an internal wall member extending across the internal cavity and connecting a first portion of the inner surface to a second portion of the inner surface;
• determining the relationship of tensile strength to deformation in several chosen locations and the stress distribution in the first precursor due to internal pressure in the vicinity of said locations;
• computing, based on data obtained in said step of determining, the wall thickness and shape of an altered second blow molded precursor that will deform under pressure into a desired shape, said second precursor having a shape and wall thickness and including an external wall with an inner and outer surface thereof, and with an internal cavity and an internal wall member therein extending across the internal cavity and connecting a first portion of the inner surface to a second portion of the inner surface;
• and
• preparing said altered second blow molded precursor by blow molding a second preform at least one of the wall thickness and shape of said second precursor being altered in relation to said first precursor so as to obtain a desired pattern of deformation in said internal and external walls due to stresses resulting from the application of internal pressure;
• thereby providing a desired blow molded plastic container.