Comparisons of mechanical properties between pure polypropylene and polypropylene filled with talc using single gate and twin gate mould

Ismail, Shahrul Azwan (2016) Comparisons of mechanical properties between pure polypropylene and polypropylene filled with talc using single gate and twin gate mould. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Polypropylene (PP) is one of the most popular plastic material nowadays. It is a type of plastic materials that can be processed easily and consume less cost. The addition of talc into polypropylene may affect the polypropylene performance. Thus, the objective of this study is to find out the maximum mechanical properties of dumbbell plastic products having single gate and twin gate using pure polypropylene and polypropylene filled with talc. The mechanical properties that investigated are tensile strength, modulus of strength and percent of elongation. Firstly, the injection moulding process was performed to get the specimens. The parameter that has been set for injection moulding process were mould temperature, melt temperature, injection time and cooling time. The suggested value of parameters for injection moulding process was gained from moldflow simulation. Then, tensile test applied to the specimens obtained from injection moulding. The result gained from tensile strength then analysed using Minitab 17 software by applying S/N ratio in taguchi method and ANOVA analysis. Both of this method helps in determining the optimum values of parameter to achieve highest value of mechanical properties. They also help in determine which parameter is the most significance to the responses. The result obtained shows that the highest tensile strength belongs to pure polypropylene using twin gate mould with the most significance parameter is mould temperature. For modulus of strength, the highest value comes from polypropylene filled with talc using single gate mould while the result most affected by mould temperature. For percent of elongation, the highest value gained from pure polypropylene using single gate mould with mould temperature as the most significance parameters. The results of this study clearly can contribute in any sectors especially in automative industry. The best material for the car parts such as spoiler can be determined based on the result obtained from this study.

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