The MIIS Eprints Archive

Foam formation in the plastics industry

Bradley, A. and Cooker, M.J. and Dellar, P.J. and Fitt, A.D. and Fowler, A.C. and Keener, J.P. and King, J.R. and Lacey, A.A. and Lee, W.T. and Mitchell, S.L. and Richardson, G. and Vynnycky, M. (2011) Foam formation in the plastics industry. [Study Group Report]



The manufacture of polyvinyl (PVC) fascia boards involves the extrusion of a pressurized mixture of molten PVC and foaming agents through a die that is shaped in the exterior of a board; subsequent pressure release triggers foaming, so that the interior of the board is filled, simultaneously as the board is cooled. Sometimes, however, the foam does not fill the interior, leading to undesired voids, especially at corners. We consider a mathematical model for the foaming process that attempts to account for the formation of undesired voids. Preliminary model results suggest that severe temperature gradients through the cross-section are most likely responsible for void formation; two mechanisms are suggested.

Item Type:Study Group Report
Problem Sectors:Materials
Study Groups:European Study Group with Industry > ESGI 82 (Limerick, Ireland, Jun 26-Jul 1, 2011)
Company Name:Cork Plastics
ID Code:609
Deposited By: Matthew Hennessy
Deposited On:04 Apr 2013 13:13
Last Modified:29 May 2015 20:13

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