Study of operation process, production planning and forecasting of Voglyplast Co.Study of operation process, production planning and forecasting of Voglyplast Co. Μελέτη παραγωγικής διαδικασίας, προγραμματισμός και πρόβλεψη παραγωγής της εταιρείας Voglyplast Διπλωματική Εργασία Diploma Work 2018-12-062018enThe increasing competition in business environment, as well as the challenging financial situation in Greece, require an effective and efficient production planning in any company in order to overcome the obstacles and remain competitive. This thesis is conducted at Voglyplast Co., which is a manufacturing company that produces PET preforms, bottles and jars. The main sections of the thesis are the modelling and the simulation of certain scenarios of the production process and the demand forecasting for 2018. Initially, the Petri Net formalism is used for modelling the production process of fifteen best-selling products, which are divided into three categories according to the characteristics of their production. Then, the simulation of alternative scenarios of the production process takes place and the results that are obtained indicate the potential improvement of the production capacity. The demand of the following year is based on the past observations of each product. Four different forecasting models are implemented, but the most reliable and accurate with respect to the error measurements is finally chosen. Finally, in the conclusion, recommendations for the improvement of the operation process are presented and future potential extensions of the present thesis are proposed. http://creativecommons.org/licenses/by/4.0/Πολυτεχνείο Κρήτης::Σχολή Μηχανικών Παραγωγής και ΔιοίκησηςKapsoulia_Aikaterini_Dip_2018.pdfChania [Greece]Library of TUC2018-12-05application/pdf12.5 MBfree Kapsoulia Aikaterini Καψουλια Αικατερινη Tsinarakis Georgios Τσιναρακης Γεωργιος Ioannidis Efstratios Ιωαννιδης Ευστρατιος Marinakis Ioannis Μαρινακης Ιωαννης Πολυτεχνείο Κρήτης Technical University of Crete Petri nets Forecasting methods Error measurements PET packaging