Effect of Granulation Conditions on Bubble Formation in Rotomolded Final Product

Bubble formation in objects manufactured via rotomolding must be minimized or even prevented, which is influenced by many factors such as operational conditions of rotomolding process, characteristics of polymer,granulation process conditions, etc. In this work compounding and granulation process of polyethylene (PE) powder produced in a gas-phase reactor were carried out by two different compounders under two different conditions and the effect of granulation conditions on the bubble formation in products of rotomolding process has been studied. Our results showed that for a given sample of PE powder, the granulation process affected the bubble formation and the number of bubbles in objects molded under the same condition of rotomoloding process