Abstract
Rotational moulding appears to be a simple processing method for manufacturing hollow plastics but in fact it involves a complex interaction of many variables. During bi-axial rotation, the plastic powder moves about inside the mould and will subsequently melt and form a layer on the inside surface of the mould. Numerical modelling of this process has proved difficult. This paper reviews briefly the early attempts involving necessary simplifications and describes the results of recent research to provide a comprehensive model of the heat transfer mechanism during the process. Predictions of temperature at various locations inside the mould are presented and compared with the experimental data taken from full-scale rotomoulding equipment. Prediction of the melting behaviour of the plastic powder is also shown. The relative effects of the main process variables are described and the data are used to recommend improvements in the process.
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