How do you calculate trim recovery value in blow molding?

Multiply recoverable trim weight by resin value and your capture share to get gross value, then add fixed grinding and handling cost. Here, 950 units at an effective 0.496 $/lb and 88% capture gives 351.12 dollars gross.

Why is the fixed cost added instead of subtracted?

In this model the fixed grinding and handling figure is carried as a positive adjustment to the line, so the net result of 471.12 reflects that convention. If you intend it as a cost, enter it as a negative number to subtract it from gross value.

What is a realistic capture share for trim?

Well-run lines with beside-the-press grinders capture 85-95% of flash; the 88% used here is solid. Losses come from fines, contamination, and trim that misses the conveyor.

Is regrind worth the same as virgin resin?

Usually not. Regrind from clean in-house trim is close, but melt history degrades some properties, so many shops cap regrind percentage and value it at a discount to virgin.

Should I grind in-house or sell trim to a broker?

Run both through this tool. If net recovery beats the broker's offer after grinding cost, keep it in-house; clean single-resin trim often sells well enough that small shops skip the granulator capital.

What is the recovered resin value figure in the results?

It is the effective per-pound value back-calculated from your inputs, here about 0.496 $/lb, useful as a sanity check against your contract resin price.

Blow Molding & Hollow Plastic Products calculator

Trim Recovery Value Calculator

Every extrusion blow molded part throws off flash, tails, and pinch-off trim, and that material is money if you grind and reuse it instead of paying to haul it away. Trim recovery value is the net dollars you capture from regrinding that scrap, after accounting for how much you actually recover and the cost of running the granulators and conveyors. Plant managers and cost accountants in bottle, jug, and jerrican production use it to decide whether in-house regrind, a beside-the-press grinder, or selling clean trim to a broker makes the most sense. The number is sensitive: capture rate and resin price swing it more than the trim weight itself.

What this calculator does

Estimate recovered value from blow molding trim, flash, tails, and regrind using recovered material weight, value per unit, capture share, and fixed recovery costs.
a blow molding operation needs to value recoverable trim, flash, tail, or neck scrap from a run or shift
It computes gross captured value as recoverable trim weight times resin value times the capture share, then adds a fixed grinding and handling cost to report the net recovery value.

Formula used

Gross captured trim value = recoverable trim and flash weight × recovered resin value × recovery capture share
Net trim recovery value = gross captured trim value + fixed grinding and handling cost

Inputs explained

Recoverable trim and flash weight:
Recovered resin value:
Recovery capture share:
Fixed grinding and handling cost:

How to use the result

Use it when sizing a regrind program, comparing in-house grinding to selling scrap, or building the resin-cost side of a quote that relies on closed-loop trim reuse.
It treats resin value as the price of virgin-equivalent material; in reality regrind often carries a property haircut, so the usable value per pound can be lower than the market resin price.

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 trim recovery value in blow molding? Multiply recoverable trim weight by resin value and your capture share to get gross value, then add fixed grinding and handling cost. Here, 950 units at an effective 0.496 $/lb and 88% capture gives 351.12 dollars gross.
Why is the fixed cost added instead of subtracted? In this model the fixed grinding and handling figure is carried as a positive adjustment to the line, so the net result of 471.12 reflects that convention. If you intend it as a cost, enter it as a negative number to subtract it from gross value.
What is a realistic capture share for trim? Well-run lines with beside-the-press grinders capture 85-95% of flash; the 88% used here is solid. Losses come from fines, contamination, and trim that misses the conveyor.
Is regrind worth the same as virgin resin? Usually not. Regrind from clean in-house trim is close, but melt history degrades some properties, so many shops cap regrind percentage and value it at a discount to virgin.
Should I grind in-house or sell trim to a broker? Run both through this tool. If net recovery beats the broker's offer after grinding cost, keep it in-house; clean single-resin trim often sells well enough that small shops skip the granulator capital.

Last reviewed 2026-05-12.