The project was carried out at the company I.F.A.P. SpA and carries out an in-depth study of the blowing department. The company processes the plastic material (PET) creating preforms of various types and sizes and HDPE caps through injection molding, bottles through the blow molding process. The various production processes aimed at creating preforms from PET grains, from preforms to bottles and from HDPE grains and additives in caps were illustrated. The second chapter illustrates the tools of Lean Production, from its birth by Sakichi Toyoda to the present day, where these rules have great use and have become fundamental. The concept of Toyota Production System is totally different from the organization of mass production, since it is based on the concept of "do more (obtain maximum results) with less (with the minimum necessary resources)".