Screw design – part 3 | moulding masterclass Have you missed any instalments?
The first 32 articles published in the Moulding Masterclass series by John Goff between 2009 and August 2013 have been compiled into one convenient volume. You can now benefit from his experience and practical advice by keeping a copy on your desk or the shopfloor. Re-read early articles on the influence of screw design, and the choice of injection time, holding pressure, gate sizes and much more. To find out more, and to purchase a copy of this essential guide to process optimisation and high quality cost-effective moulding for just €60, follow the link:
http://bit.ly/1dM2Yhx
Partially plasticised particles are not typically
encountered when processing amorphous type materials (PC, SAN, PMMA, PSU, PES) as these soften upon the introduction of heat energy rather than exhibiting a defined melting point. What is often a problem when processing amorphous polymers, however, is mouldings showing surface streak defects commonly identified as ‘silvering’. Often mistakenly considered to be due to moisture in the polymer, these streaks are a clear indication of the presence of poorly plasticised or inhomogeneous material. This discussion will be continued in the next instalment in the Moulding Masterclass series.
About the author: Moulding Masterclass series author John Goff is a chartered engineer (CEng), Fellow of the Institute of Materials, Mining and Metallurgy (FIMMM), and CEO of UK-based injection moulding process consultancy and training company G&A Moulding Technology (
www.gandamoulding.co.uk), which provides consultancy services on all aspects of process setting, optimisation and control, including hot runner technology. The company also developed and markets its own Pro-Op process optimisation software tool. You can read the most recent instalments in this series here, here and here.
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