Case Study 4 - Runner Systems Comparison

Before
( Cold runner)
No. of cavity 4
Material used PA66 GF30%
Material cost (Est.) US$ 4.60/kg
Qty/Month/Mould 300K pcs
After
( Mini runner)
Product application: Automotive
Runner System

Runner weight
(Material)

Cycle time
(Machine)

 Productivity/day
Before Cold runner 3,145 g/pc 8,75 sec/pc 9,578 pcs
After Mini runner 0,79 g/pc 1,88 sec/pc 44,578 pcs

Approx.saving

(cost of material @ US$ 3.00/kg& molding machine @ US$ 20/hr)

 0,0975 g/pc (75%) 0.62 sec/pc (26%) 11.055pcs (34%)
US$ 0.01083 /pc US$ 0.0125 /pc
Total saving (Material + Machine) US$ 0.02333 /pc  
MSK mini runner system cost US$ 4,600
Estimated ROI

ROI =

  • MSK minirunner system cost
  • Total saving x Qty/mth
 0.7 months
Approx.saving (Total saving x Qty/mth x 12)
Year 1 – US$ 79,088 Year 2 – US$ 83,988