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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Rotational moulding - a simplified theory

Pethrick, R.A. and Hudson, N.E. (2008) Rotational moulding - a simplified theory. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 222 (L3). pp. 151-158. ISSN 1464-4207

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Abstract

This paper considers a number of theoretical approaches to the description of the various and complex issues, which are involved in rotational moulding. Experimental rheological measurements are presented to illustrate the changes, which can occur in typical rotational moulding grade polymers when subjected to shear and also when held at an elevated temperature for a sustained period of time. The influence of temperature on the viscosity is indicated to be an important factor in bubble release and maintenance of wall thickness in thick-walled mouldings. Although it is desirable to have a low viscosity in the melt to aid bubble release and hence reduce the time that the polymer spends in the melt phase, the problem of maintaining contact with the mould wall can arise in thick moulded sections.