Optimization of spray paint process on high cosmetic job

Lee, Zhen An (2018) Optimization of spray paint process on high cosmetic job. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Coating is a film-forming material that provides pleasing appearance, corrosion protection and block-out ultraviolet ray. Among various types of coating, spray painting remains its popularity due to the quality performance and economic consideration. Spray painting is simply the conversion of paint atomization from liquid paint into a mist of spray whereby the atomized paint is applied on a targeted object. The study on optimizing process parameters of spray painting is conducted for producing high cosmetic aluminium on the die casting surface. This is a real industrial problem that applied for Dynacast Sdn. Bhd. There are many variables affecting the performance of spray painting. These variables include spray paint technology, type of paints, surface preparation process parameters, etc. In current stage, there is lack of good practice approach available for the selected technology. The work is mostly based on experience and trial and error. In this experiment approach, five significant process parameters with varied settings are selected. Taguchi method is adopted for a robust experimental outcome and due to varied parameters. The set of runs were conducted with four repetitions by including temperature and viscosity as the noises. For the responses the coating thickness and glossiness measurements are conducted. Fischer coating thickness gauge is used to measure coating thickness while Glossmeter is used to measure gloss level of the surface. Based on the signal to noise ratio analysis, it is found that corresponding type of paint and preparation are the significant factors for highest glossiness and targeted coating thickness. The optimised glossiness and thickness measurement obtained in this study are 79 GU and 28.5μm respectively.

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