How do you calculate cavitation output?

Divide good containers produced by the measured runtime for the raw rate, then multiply by the cavitation efficiency. From 28,800 containers in 8 hours, the raw rate is 3,600 per hour, and at 92 percent efficiency the effective cavitation output is 3,312 containers per hour.

What is cavitation efficiency in blow molding?

It is the percentage of a mold's theoretical cavity output you actually realize, after dead cavities, slow cycles, and rejects. A 92 percent figure means the mold is delivering 92 percent of what all cavities running perfectly at target cycle would produce.

What is a good cavitation efficiency?

Well-run blow lines hold 90 to 95 percent on mature tooling. New molds or unstable processes can sit in the 80s. Falling below 85 percent usually means a cavity is down, cycle time has crept up, or reject rates are eating into good output.

How is cavitation output different from rated cavitation?

Rated cavitation is the cavity count times the design cycle, an ideal. Cavitation output is what the mold actually achieves per hour after real losses. The example mold's effective 3,312 per hour is the planning number; the rated figure would be higher and rarely sustained.

How do I raise cavitation output?

Recover dead or short-shooting cavities, tighten cycle time with better cooling and faster transfers, and cut rejects so more of the output counts as good. Lifting efficiency from 92 to 96 percent on a 3,600 raw rate adds roughly 144 good containers every hour.

Should I plan with raw rate or effective output?

Plan with effective output. The raw 3,600 per hour ignores the efficiency loss already baked into your process, so scheduling against it will over-promise. The 3,312 effective rate reflects what the mold sustainably delivers.

Blow Molding & Hollow Plastic Products calculator

Cavitation Output Calculator

Cavitation output is the effective hourly container rate a blow mold delivers once you account for how efficiently its cavities actually run versus their theoretical maximum. Plant managers and continuous-improvement teams use it to benchmark a mold against its rated capacity, expose underperforming cavities, and feed realistic rates into scheduling. It turns a raw count over a runtime into a quality-adjusted rate you can trust for planning. It is the difference between what the mold could do and what it really does.

What this calculator does

Estimate effective bottle or container throughput from completed output, runtime, and cavitation efficiency for blow molding molds.
a production team needs to measure actual output from a multi-cavity bottle, container, or preform mold
It divides good containers produced by the measured runtime to get a raw hourly rate, then scales that by a cavitation efficiency percentage to give the effective output per hour.

Formula used

Raw mold output = good containers produced ÷ measured mold runtime
Effective cavitation output = raw mold output × cavitation efficiency

Inputs explained

Good containers produced:
Measured mold runtime:
Cavitation efficiency:

How to use the result

Use it to benchmark mold performance, set realistic planning rates, or quantify the gain from fixing a slow or blanked cavity.
Efficiency here is a single blended percentage; it tells you the line is losing output but not whether the cause is a dead cavity, slow cycle, or rejects, so it flags the problem without diagnosing it.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 9,635 plastics product manufacturing establishments employing about 677,302 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate cavitation output? Divide good containers produced by the measured runtime for the raw rate, then multiply by the cavitation efficiency. From 28,800 containers in 8 hours, the raw rate is 3,600 per hour, and at 92 percent efficiency the effective cavitation output is 3,312 containers per hour.
What is cavitation efficiency in blow molding? It is the percentage of a mold's theoretical cavity output you actually realize, after dead cavities, slow cycles, and rejects. A 92 percent figure means the mold is delivering 92 percent of what all cavities running perfectly at target cycle would produce.
What is a good cavitation efficiency? Well-run blow lines hold 90 to 95 percent on mature tooling. New molds or unstable processes can sit in the 80s. Falling below 85 percent usually means a cavity is down, cycle time has crept up, or reject rates are eating into good output.
How is cavitation output different from rated cavitation? Rated cavitation is the cavity count times the design cycle, an ideal. Cavitation output is what the mold actually achieves per hour after real losses. The example mold's effective 3,312 per hour is the planning number; the rated figure would be higher and rarely sustained.
How do I raise cavitation output? Recover dead or short-shooting cavities, tighten cycle time with better cooling and faster transfers, and cut rejects so more of the output counts as good. Lifting efficiency from 92 to 96 percent on a 3,600 raw rate adds roughly 144 good containers every hour.

Last reviewed 2026-05-12.