Calculation
| Summary | - Jobs that allow regrind take 50 percent of the plant's 5 million pounds of resin per year.
- We count 1.5 percent of those pounds as ground and molded again, about 37,500 pounds.
- At $1.50 per pound that is about $56,300 of new resin per year.
- The grinders cost about $8,300 per year to run, which leaves about $48,000.
|
| Resin on jobs that allow regrind, in lb per year | 5,000,000 lb x 50 percent = 2,500,000 |
| Runners and rejected parts ground and molded again, in lb per year | 2,500,000 lb x 1.5 percent = 37,500 |
| New resin no longer bought | 37,500 lb x $1.50 per lb = $56,250 |
| Less what the grinders cost to run | 6 grinders x (6,000 kWh at 10 cents + $150 for blades + 25 minutes of a handler per week at $30 per hour) = $8,250 |
| What fixing it could save per year | $56,250 - $8,250 = $48,000 |
Not counted
- The dumpster hauls that would fall, and the trips to the scrap dock, are not counted.
- Runners on jobs that allow no regrind are not counted.
- Sorted and sold to a recycler, they would bring in about $5,600 per year.
- A blender that weighs the mix at the press costs $8,000 to 20,000 and is not in the cost to fix.
Illustrative sample. The plant, the walk and the footage are synthetic.