Re: Thermal degradation of polymers?

From: Michael Priest (M.L.Priest@tesco.net)
Date: Mon Jul 30 2001 - 05:56:12 EEST


Hi all,

Bearing in mind that rapid tooling mould cycle times are often longer than
conventional tooling, a molten polymer will remain static in the barrel of
an injection moulding machine for a greater length of time than in a
production environment. Has anyone established any links between the
prolonged heating of a molten semi-crystalline polymer in the machines
barrel and the mechanical properties or shrinkage that results in the
mouldings? I would assume that after a period of time the polymers molecules
would degrade and the properties and shrinkage of the moulding would be
affected. Any suggestions?

Mick Priest

Engineering Dept.
Warwickshire College
Leamington Spa
UK

For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/



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