Rotational moulding of liquid polymers

E. Harkin-Jones, R. J. Crawford

Research output: Contribution to journalArticlepeer-review


The vast majority of rotationally moulded articles are produced from powdered polymers. However, the moulding process developed originally from the use of liquid polymers and nowadays there is a removed interest in such systems because of some unique advantages that they offer. This paper compares the behaviour of three different liquid polymer systems - nylon 6 by ring-opening caprolactam, polyvinyl chloride plastisol and polyurethane. The flow behaviour of each material is examined with particular reference to wall thickness distributions and bubble formation in the product. On the basis of this, criteria for the production of fault-free mouldings have been established. The interrelationships between mould shape and resin viscosity are also examined and an ideal viscosity-time-temperature profile is proposed for liquid polymer systems. Finally, a general comparison of the materials is made with regard to material handling, safety, cycle times, etc.

Original languageEnglish
Pages (from-to)437-447
Number of pages11
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Issue number5
Publication statusPublished (in print/issue) - 1 Jan 1996


  • Liquid polymers
  • Nyrim
  • Rotational moulding


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