Dr Robin Kent is the author of ‘Energy Management in Plastics Processing’ (published by Elsevier), ‘Sustainability Management in Plastics Processing (published by the British Plastics Federation) and Managing Director of Tangram Technology Ltd., consulting engineers specialising in energy and sustainability management in plastics processing. © Tangram Technology Ltd., 33 Gaping Lane, HITCHIN, SG5 2JE, UK rkent@tangram.co.uk www.tangram.co.uk