energy management | Strategy
moulding sites we have measured energy use for many sites and many machines. The most common (and often badly misused) index of energy use for both sites and machines is the Specifi c Energy Consumption (SEC). This is the familiar kWh/kg value that many moulding site operators use to measure their energy effi ciency at either the site or machine level.
Figure 2: Site SEC for injection moulding settings and other variables). These simple pie-charts give good guidance to
injection moulding companies on where they should be looking for energy savings and the main motors are the obvious choice.
Energy or output? Over years of work reducing energy use at injection
At the site level, the fi eld results for SEC versus production rate gives the curve shown in Figure 2 and this can be used as a benchmark curve to check the effi ciency of the site. This can be compared with similar actual fi eld results at the machine level (shown in Figure 3 for hydraulic and all-electric IMMs), which can be used as a benchmark curve to check the effi ciency of an individual IMM.
Figure 2 and Figure 3 both show that as the produc-
tion rate increases then the SEC (kWh/kg) decreases. This is the inevitable result of amortising the ‘fi xed’ loads over the ‘process’ loads at both the site and at the machine. The wonderful thing about this is that there is no
confl ict at all between the desire to improve energy effi ciency and the desire to improve production output.
NEW PUBLICATION From Plastics Information Direct: the publisher and bookseller for the plastics industry
Cost Management in Plastics Processing: Strategies, targets, techniques and tools
Revised and expanded third edition of a best-seller
Practical advice applicable to all plastics processors Re-evaluates how and where savings can be made A structured route-map with simple tasks and achievable goals Increased focus on environmental impacts and energy costs
For more information and to order your copy, please CLICK HERE Visit
www.pidbooks.com
for hundreds of recent titles, easy online ordering, special offers and clearance bargains! Order online or by telephone, fax or email. Contact Matt Wherlock,
Tel: +44 (0)117 924 9442 Fax: +44 (0)117 9892128 email:
mjw@amiplastics.com All prices are correct at the time of publication but may be subject to change.
Please check the Plastics Information Direct website for current prices and shipping charges.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70