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Prof R E Cameron

This lecture course will cover:

A. Introduction

  • Motivation, Basic classification of polymers, basic types of processing

B. Basics of polymer melt rheology

  • Viscosity, Reynolds number, non-Newtonian behaviour, flow through a pipe, flow curves, slippage, Bagley correction.

C. Materials Behaviour during the Processing Stages

  • Overview
  • Melt flow: die entry (extension, melt fracture), viscoelastic effects (Deborah number), ie- exit effects (die swell, sharkskin), flow front (fountain flow, weld lines), orientation retraction)
  • Melting: memory effects, degradation, conductivity
  • Cooling: heat transfer, Fourier equation, shrinkage, crystallization
  • Mixing: additives, types of mixing, forces and energy

D. Industrial Processing Methods

  • Mixing: blending, intensive mixing
  • Extrusion based processes: screw extruders, blow moulding, bubble blowing, calendering, Stentor process
  • Moulding processes: compression moulding, injection moulding, machine, rotational moulding, reaction injection moulding, push-pull moulding
  • Thermoforming: vacuum, pressure

E. Processing Design

  • General principles, gating, mould filling design