Calculator Inputs
Example Data Table
| Input | Example Value | Meaning |
|---|---|---|
| Conveyor speed | 2.4 m/min | Line movement rate. |
| Hanger pitch | 0.6 m | Spacing between loaded hangers. |
| Parts per hanger | 3 | Average loading density. |
| Film thickness | 70 microns | Target dry film build. |
| Transfer efficiency | 62% | Powder deposited versus sprayed. |
| Oven dwell | 22 minutes | Required cure time inside heated length. |
Formula Used
Hangers per minute = Conveyor speed ÷ Hanger pitch
Parts per minute = Hangers per minute × Parts per hanger
Available minutes = Shifts × Hours per shift × 60 × Uptime
Gross parts per day = Parts per minute × Available minutes
Good parts per day = Gross parts per day × (1 − Reject rate)
Coated area = Gross parts × (1 + Recoat rate) × Area per part
Deposited powder kg = Area × Film thickness in meters × Density kg/m³
Sprayed powder kg = Deposited powder kg ÷ Transfer efficiency
Purchased powder kg = Sprayed kg − Recovered overspray kg
Required oven length = Conveyor speed × Oven dwell time
Total daily cost = Powder cost + Energy cost + Labor cost + Overhead cost
Cost per good part = Total daily cost ÷ Good parts per day
How To Use This Calculator
Enter the physical line data first. Add conveyor speed, hanger pitch, part area, and loading density.
Next, enter shift time, uptime, reject rate, and recoat rate. These values convert ideal capacity into usable output.
Then add coating data. Use film thickness, powder density, transfer efficiency, recovery efficiency, and powder cost.
Finally, add oven and cost data. Press Calculate. Review output, powder use, oven limits, target gap, and cost per good part.
Planning Article
Planning a Coating Line
A coating line is a moving system. It has hooks, racks, washers, booths, ovens, and unload points. Each station must match the next station. A small mismatch can slow the whole line. This calculator turns those limits into daily numbers. It helps planners compare speed, pitch, booth use, cure dwell, and cost.
Capacity And Flow
Line capacity starts with conveyor speed and hanger pitch. Speed divided by pitch gives hangers per minute. Parts per hanger then gives parts per minute. Uptime reduces that value to a realistic day. Rejects reduce it again. The final good output is the number that matters for schedules, quotes, and labor plans.
Powder And Film Build
Powder demand depends on area, film thickness, density, and transfer efficiency. A thicker film needs more material. Low transfer efficiency increases sprayed powder and overspray. Recovery can lower purchased powder, but it never removes every loss. For this reason, the calculator separates deposited powder, sprayed powder, recovered powder, and purchased powder.
Oven Balance
Cure dwell is another bottleneck. The oven must be long enough for the selected conveyor speed. Required oven length equals speed multiplied by dwell time. If the available oven is shorter, the line must slow down. That change may reduce daily output, even when the booth can coat faster.
Cost Control
True line cost includes powder, energy, labor, and overhead. Cost per good part is better than cost per gross part. It includes rejects and recoat work. This view helps teams find waste. A small improvement in rejects, transfer efficiency, or uptime can save large amounts on a busy line.
Using The Results
Use the output as a planning guide. Check your plant records before final decisions. Measure real hanger loading and actual film thickness. Compare several cases. Try one case for today, one for a faster shift, and one for a lower reject rate. The best setting is usually balanced, not simply fastest.
Practical Checks
Always confirm assumptions with test panels and shift logs. Parts may shadow each other. Hooks may swing. Operators may leave empty spaces. Pretreatment delays can also change the real rate. Keep a safety margin when promising delivery dates. Review results after each production change and audits.
FAQs
1. What does this calculator estimate?
It estimates line capacity, powder usage, oven limits, daily cost, and cost per good part. It also compares target output with calculated output.
2. Why is hanger pitch important?
Hanger pitch controls how many hangers pass each minute. Smaller pitch usually increases capacity, but it can cause part crowding, poor coating access, or handling issues.
3. How does transfer efficiency affect cost?
Lower transfer efficiency means more powder must be sprayed to deposit the same film. That increases overspray, recovery load, purchased powder, and cost per part.
4. What is oven limited output?
Oven limited output happens when conveyor speed requires more heated length than the oven has. The line must slow down to keep proper cure dwell.
5. Should recoat rate be included?
Yes. Recoat work adds coating passes and powder demand. It may not increase shipped output, but it increases booth load, material use, energy use, and labor pressure.
6. What density unit should I enter?
Enter powder density in grams per cubic centimeter. The calculator converts it to kilograms per cubic meter for the material usage formula.
7. Can this replace plant testing?
No. Use it for planning and comparison. Final settings should be checked with test panels, cure tests, film readings, and actual production records.
8. Why use cost per good part?
Cost per good part includes rejects and usable output. It gives a better view than gross cost because only accepted parts create saleable production value.