Investigation into the Effects of Fins and Internal Cooling in Rotomoulding

The paper presents an investigation into how the introduction of internal cooling in rotomoulding influence the overall cooling rates. For the purpose of this investigation a simple cub mould is considered. The coupled fluid flow – heat transfer process, has been modelled by using ANSYS Flotran 2D. The mould motion was simulated, by implementing rotating boundary conditions. For the purpose of industrial design a comparative solution have been obtained, by using two moulds inside of the oven with the same dimensions and material characteristics. The first mould is with internal cooling device, while the second is without. From the results it is clear, that the internal cooling in rotomoulding can provide cooling rate inside of the mould, similar to the one outside or even better. This high cooling rate offers many practical advantages, including shortening the total production cycle by more than 40%. It also stabilise the plastic product and reduce the distortions during the rapid temperature change.
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