moulding masterclass | Screw design – part 1
Figure 1: Some basic injection screw terminology
Shank styles will vary
Bearing Pitch ➤ Feed depth
Land length ➤
Metering depth
valve threads Screw diameter (D)
Flight depth
Feed Section Flight or helix angle
Shank length ➤ L/D ratio = ➤ Overall screw length
Compression ratio = C.R. = Flighted length (L)
instalment in this 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 injection moulding process consultancy and G&A Moulding Technology
(
www.gandamoulding.co.uk), which provides consultancy services on all aspects of process setting, optimisa- tion and control, including hot runner
technology, and develop and markets its own Pro-Op process optimisation software tool. You can read the
Have you missed any instalments? The fi rst 32 articles published in the Moulding Master- class series by John Goff between 2009 and August 2013 have been compiled into one convenient volume. You can now benefi t from 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 optimisation and high quality cost-effective moulding for just €60, £50 or $75, follow the link:
http://bit.ly/1dM2Yhx
Screw diameter (D) Feed channel depth
Metering channel depth
most recent instalments in this series here, here and here.
Transition section ➤
Flighted length (L)
Metering section
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Non-return
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