Case Study 2 - Runner Systems Comparison

Before
( Cold runner)
No. of cavity 8
Material used PC
Material cost (Est.) US$ 3.00/kg
Qty/Month/Mould 480K pcs
After
( Mini runner)
Product application: Medical
Runner System

Runner weight
(Material)

Cycle time
(Machine)

 Productivity/day
Before Cold runner 0,862 g/pc 2,5 sec/pc 23,119 pcs
After Mini runner 0,15 g/pc 1,88 sec/pc 37,248 pcs

Approx.saving

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

 0,712 g/pc (83%) 0.62 sec/pc (25%) 14,129 pcs (61%)
US$ 0.00242 /pc US$ 0.00344 /pc
Total saving (Material + Machine) US$ 0.01006 /pc  
MSK mini runner system cost US$ 4,500
Estimated ROI

ROI =

  • MSK minirunner system cost
  • Total saving x Qty/mth
 0.9 months
Approx.saving (Total saving x Qty/mth x 12)
Year 1 – US$ 53,599 Year 2 – US$ 57,945