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moulding masterclass | Moving moulds part 2


the linear injection speed can be reduced resulting in a longer fi ll time and/or the melt temperature, in association with the hot runner temperatures, can be increased to lower the inherent resistance. Such a reduction will allow the manufacture of the box mouldings to be consistently produced using Speed


The fi rst 32 articles published in the Moulding Masterclass series by John Goff between 2009 and August 2013 have now been compiled into one convenient volume. You can now benefi t from all his experience and practical advice by keeping a copy on your desk or the shopfl oor. Re-read early articles on the infl uence of screw design, and the choice of


injection time, holding pressure, gate sizes and much more. To fi nd out more, and to purchase a copy of this essential guide to process optimisa- tion and high quality cost-effective moulding for just €60, £50 or $75, follow the link:


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Control but not with full structural integrity. It can be inferred from the above that replication of


the processing parameters cannot take place from one moulding machine to another in this case, even though the moulding machines would be deemed identical on the surface. This discussion will be continued in the next edition.


About the author: John Goff is a chartered engineer (CEng), a Fellow of the Institute of Materials, Mining and Metallurgy (FIMMM), and CEO of injection moulding process consultancy and 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, and developed and markets its Pro-Op process optimisation software tool. This is the 34th instalment in his Moulding Masterclass series. You can read the most recent instalments in this series here, here, and here.


Injection World thanks Sumitomo SHI Demag for making its machine data available for this article.


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