Publication: Effect of ball clay addition in slip casting in making of gloves former
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Date
2022-08-18
Authors
Zulkifli, Farzana
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Abstract
Glove formers are a porcelain hand mould shape that used in glove industry and made by using slip casting technique. Initially, the formulation of glove former has around 23.10%
of ball clay. In this research, the effect of adding more ball clay into the formulation was carry out. Other than that, the effect of milling the ball clay towards the properties of vitrified
body of gloves former was identified. The ball clay addition added from 0%, 2%, 4%, 6%, 8% and 10%, respectively. Glove formers are using wet milling process before proceeding
to form the glove former using hollow casting method. There a few characterizations done towards the vitrified body such as shrinkage, warpage, porosity measurement, water
absorption testing, acid and alkali corrosion testing, modulus of rupture, and thermal shock. The morphology of the glove former surfaces was observed by using scanning electron
microscope (SEM). At the end of the research, it was found that, ball clay addition into the composition of glove former will affect the physical and mechanical properties of glove
former. Higher percent of addition of ball clay caused the water absorption increases, the corrosion test decreases while increases of the modulus of rupture. Furthermore, when
comparing between milled and unmilled ball clay towards the properties of vitrified body of glove former, it found that, the water absorption of milled ball clay was lower compared to unmilled ball clay. Meanwhile, corrosion test results show that, the unmilled set tend to have higher corrosion rate especially when immersing the glove former into 10% of sodium hydroxide solution. Hence, 4% of ball clay in composition of glove formers have the best properties of physical and mechanical properties. As the results of low water absorption and low corrosion rate, it proved that 4% ball clay addition of unmilling the ball clay has the best properties. This can be related to the function of the glove former that will gone through cleaning process where the glove formers are immersed in water, acid, and alkali solutions. Therefore, a quality glove former need to be low water absorption, low corrosion rate, and pass the thermal shock test.