How do you find the bottleneck on a coating line?

Express each stage as a sustainable capacity in parts per hour and take the smallest. At the defaults the washer is 420, the booth 400, the oven 380 and load is 450, so the oven constrains.

What does the line balance percentage mean?

It is the bottleneck divided by the average of the four stages. High balance means the stages are matched; low balance means one stage is far behind and cheap rate is available.

Why did fixing my bottleneck barely raise output?

The next stage was close behind. Raising the oven from 380 to 500 moves the example line only to 400, where the booth takes over, so the gain was capped.

Which stage is usually the constraint on a powder line?

It changes with the mix: cure-heavy work binds the oven, deep Faraday geometry slows the booth's quality-limited rate, and hand-hung small parts make load stations the wall.

Finishing calculator

Coating Line Bottleneck Calculator

Find the stage that sets the line's rate by letting the four stages compete. Enter pretreatment, booth, oven and load capacity in parts per hour.

What this calculator does

Compare four finishing stages as capacities and name the constraint, so improvement money lands where the line's rate is set.

Formula used

Bottleneck capacity = smallest of the four stage capacities
Fastest stage = largest of the four
Capacity spread = fastest stage − bottleneck capacity
Line balance = bottleneck capacity ÷ average of the four × 100

Inputs explained

Pretreatment and Dry-Off Capacity: Washer and dry-off sustainable rate, from stage speed and dwell.
Application Booth Capacity: Quality-limited coating rate: line speed at which film build holds.
Cure Oven Capacity: Cure-limited ceiling: fastest curing speed times hanging density.
Load and Unload Capacity: Hanging and packing rate with the crew actually assigned.

How to use the result

Best suited to naming the stage that owns the line's rate, pricing what an oven upgrade really buys, checking whether hanging labor is the constraint.
Extra stations such as masking or a second booth need a fifth capacity compared by hand. Buffers let the line briefly beat its bottleneck; this is the steady-state ceiling. Variability is invisible: two matched stages can still starve each other.

Current U.S. benchmarks

Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How do you find the bottleneck on a coating line? Express each stage as a sustainable capacity in parts per hour and take the smallest. At the defaults the washer is 420, the booth 400, the oven 380 and load is 450, so the oven constrains.
What does the line balance percentage mean? It is the bottleneck divided by the average of the four stages. High balance means the stages are matched; low balance means one stage is far behind and cheap rate is available.
Why did fixing my bottleneck barely raise output? The next stage was close behind. Raising the oven from 380 to 500 moves the example line only to 400, where the booth takes over, so the gain was capped.
Which stage is usually the constraint on a powder line? It changes with the mix: cure-heavy work binds the oven, deep Faraday geometry slows the booth's quality-limited rate, and hand-hung small parts make load stations the wall.

Last reviewed 2026-10-01.