Optimization Of Injection Molding Parameters For 80:20 Virgin-Regrind Blended ABS Plastic Material

Woo, Wan Nee (2018) Optimization Of Injection Molding Parameters For 80:20 Virgin-Regrind Blended ABS Plastic Material. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Plastic has been a widely used as the material for most of the products in the human life. However, the rate of producing plastic product is much faster than the rate of the recycling of plastic, resulting the plastic pollution. Plastic recycling is a common process in the industry, for environment preservation and more importantly cost saving. ABS is a type of plastic that commonly used as Lego bricks and as the material of filament for 3D printings, household products such as kitchen appliances and pipes, due to its toughness and high impact resistance. Moreover, injection molding is the most common plastic processing for various type of thermoplastic. To optimize the injection molding parameter for 80:20 virgin-regrind blended ABS plastic material, the four control parameters are injection pressure, holding pressure, injection speed and holding time with each four levels is tabulated with corresponding levels using the L’16 orthogonal array table in Taguchi method. Type I specimen from ASTM D638-14 is produced by using the injection molding machine with 16 experiments from the OA table, followed by five trials of tensile testing to obtain the ultimate tensile strength. The results are analyzed by using the S/N ratio and ANOVA, which the significance of each parameter towards the UTS of the ABS blends specimens and the optimal combination of the parameter with corresponding level can be determined. After the analysis, it can be said that the objectives of the research are achieved. The most significant factor in this research is the injection pressure, and the optimized injection molding parameter for 80:20 virgin-regrind blended ABS plastic specimen is injection pressure at 110 MPa, holding pressure at 20 MPa, injection speed at 115 mm/s and holding time at 10 s.

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