Optimization of injection moulding parameter for virgin polypropylene (PP) plastic material

Ahmad Azli, Azzhad Azib (2021) Optimization of injection moulding parameter for virgin polypropylene (PP) plastic material. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Nowadays, injection moulding is very important in manufacturing industry due to its high demand. In order to sustain in the field of engineering, many research has been done. So, this thesis describes about how injection moulding parameter for polypropylene (PP) plastic material can be optimized. The mechanical property of the material has been investigated to determine the ultimate tensile strength using Taguchi method design of experiment. There are five process parameter that had been considered in this study which are cooling time, packing time, mould temperature, injection speed and packing pressure. Minitab software had been used in order to design an experiment regarding the ultimate mechanical property which is tensile strength. At the end of this study, the most significant injection moulding process parameter based on the tensile strength of virgin polypropylene (PP) has been determined by using Taguchi optimization method. The result showed that the most significant injection moulding process parameter that affect the ultimate tensile strength (UTS) is packing time. The rank of the process parameter is packing time followed by injection speed, mould temperature, cooling time and packing pressure. The combination of injection moulding process parameters is A2B1C1D1E1 where cooling time at level 2, packing time at level 1, injection speed at level 1, mould temperature at level 1 and packing pressure at level 1. The predicted value of ultimate tensile strength for Polypropylene material is 33.0642 Mpa

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