Effect of mould temperature different on quality plastic part in plastic injection moulding

Zuraimi, Kamarul ‘Izzat (2024) Effect of mould temperature different on quality plastic part in plastic injection moulding. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The delicate relationship between material qualities, component design, and the complexities of the injection moulding process determines the quality of thin-shell plastic injection moulded parts. Warpage and shrinkage are notable faults that provide a considerable barrier to the quality of these parts. Variation in shrinkage during the injection process of thin-shell plastic components is shown to be the main source of warpage. Variations in component shrinkage are caused by several factors, including material qualities, part design, and injection moulding process parameters. With a particular focus on cooling time and cavity and core mould temperatures, the study attempts to identify the most important injection moulding characteristics. The study aims to determine how these important factors affect the manufacturing process and the quality of the resulting parts by separating them apart. The research aims to optimise injection moulding parameters by building upon the knowledge obtained from the relevant parameters. The study selects four variables including cooling time, cavity and core mould temperatures, and their impact on important reactions like deflection, shrinkage and fill time. For the deflection, volumetric shrinkage and fill time responses, the analysis of variance obtained shows that the linear injection time is the most significant factor that affects the three responses. To minimize the deflection response (below 0.60mm), the optimal value of higher injection and cooling time are required. Secondly, to minimize the volumetric shrinkage response (below 15.36%), the optimal injection time is 10.0s, meanwhile cooling time is 50.0s. Lastly, to minimize the fill time response, the optimal value of injection time is 5.0s, meanwhile the optimal value of cooling time is 25.0s required.

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