Mechanical properties of recycled polypropylene (rPP) processed by injection molding method

Mohd Hafiedzzul , Malek Riduan (2014) Mechanical properties of recycled polypropylene (rPP) processed by injection molding method. Masters thesis, UTeM.

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Abstract

The injection moulding process is one of the most important processes in the plastic processing industry. The process mostly used thermoplastic materials that are recyclable, non-biodegradable and the decomposition process consume a significant length of time. This results the serious pollution problem, therefore studies on the recycling of thermoplastic and the usability of the recycled materials have gained significance. The objective of this research is to investigate the effect of melting temperature, packing pressure, and cooling times on tensile strength elastic modulus and Izod impact test properties of recycle PP (rPP). Samples consist of l 00% virgin polypropylene (vPP) and l 00% recycled polypropylenes (rPP) which are processed by using Nissei ( 11 Okn) Injection Molding Machine. Cavity of the mold is a dumbbell shape which is referring to ASTM D638 and ASTM 0256. This research used three controllable parameters are melting temperature, packing pressure, and cooling times. While the other parameters remained constant. Taguchi's L9 orthogonal array design was employed in design of experiment and each one at three levels, tested to determine the optimal combination effect of factors and levels in the injection moulding process. In analyse the results, Taguchi method introduced the use of the signal to-noise (SIN) ratio to determine the quality of the characteristics applied. Mechanical properties such as maximum tensile strength, elastic modulus and lzod impact strength of the specimens were measured and analysed. The results are expected to compare the mechanical properties of vPP and rPP. The experimental analysis revealed that the melt temperature has hjgh influence of mechanical properties of rPP due to high P-value in ANOV A result for maximum tensile strength, Izod impact strength and elastic modulus. The study emphasis that the improvement of mechanical properties of recycle polymers were able to achieved by optimizing the correlated processing parameters during injection molding process without any influences of additives.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Polypropylene
Subjects: T Technology > TP Chemical technology
Divisions: Library > Tesis > FKM
Depositing User: Norziyana Hanipah
Date Deposited: 14 Jul 2015 06:28
Last Modified: 14 Jul 2015 06:28
URI: http://eprints.utem.edu.my/id/eprint/14715
Statistic Details: View Download Statistic

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