How do I calculate optical sorter throughput for a MRF line?

Optical Sorter Throughput relates belt speed, belt width, and burden depth to tons per hour, then applies an ejection accuracy factor for the target material. Pushing throughput up raises burden depth, which reduces recovery because buried objects are hidden from the sensor. Most NIR and camera-based sorters have a rated tons-per-hour band per meter of belt width, so size against that band rather than a peak figure to keep recovery high.

What is a good contamination rate for MRF output, and how is it measured?

The Contamination Rate calculator divides off-spec material in a bale by total bale weight, based on audit samples. Buyer specifications for recovered fiber and containers often cap contamination in the low single digits of percent, with penalties or rejection above that. Track it alongside Re-sort and Rework Cost, because pushing throughput to hit tons per hour usually raises contamination and forces costly re-sorting or bale downgrades that erode commodity value.

How does screen efficiency affect downstream recovery?

Screen Efficiency measures the share of undersize material that correctly passes through a disc or trommel screen versus what carries over. Poor screen efficiency sends fines and small containers to the wrong stream, loading downstream optical sorters and pick lines and dragging recovery down across the whole plant. Because the first screens set the separation for everything after them, a few points of screen efficiency often matter more than any single downstream sorter.

How do I estimate recovered commodity value from a sort line?

Recovered Commodity Value multiplies the tons of each grade recovered, fiber, PET, HDPE, aluminum, steel, by its market price, then nets out Reject Stream Cost for residue disposal. Aluminum recovered by the eddy current separator is usually the highest value per ton, so its recovery rate has an outsized effect on revenue. Use it with Contamination Rate, since off-spec material lowers the grade and the price the bales fetch.

How is processing cost per ton built up for a MRF?

Cost per ton combines Pick Line Labor, Sort Line Conveyor Energy, Air Separator Energy, Maintenance Downtime, and Reject Stream Cost, spread across the tons processed. Labor and residue disposal are typically the largest levers, which is why automation like optical sorters is justified against Pick Line Labor. Run it with Capacity Gap to see whether the line can absorb more tons before another shift or an equipment upgrade is needed.

How often do optical sorters need sensor cleaning, and why does it matter?

The Optical Sorter Sensor Cleaning Interval calculator sets a cleaning frequency based on dust load and run hours, because a dusty NIR window or camera degrades ejection accuracy and quietly lowers recovery. In a dry, dusty single-stream MRF, sensors may need attention multiple times per shift. Tie it into Maintenance Downtime so the cleaning stops are planned rather than showing up as unexplained recovery loss.

Manufacturing calculator category

Municipal Waste Sorting Equipment calculators

This hub gathers free calculators for material recovery facilities and the equipment that runs them: optical sorters, screens, air separators, magnets, eddy current units, and balers. It is built for MRF operators, process engineers, and estimators who need to plan tons per hour, recovery and contamination rates, labor, and processing cost per ton before committing a line.

What this hub covers

Calculators for material recovery facilities and MRF equipment covering optical sorter throughput, contamination rate, screen efficiency, air separator energy, baler capacity, and recovered commodity value.
Browse municipal waste sorting equipment calculators for manufacturing planning, quoting, quality, capacity, and operations decisions.

Best calculators in this category

Optical Sorter Throughput: Estimate the good tons per shift an NIR or color optical sorter actually delivers after belt speed, availability, and ejection accuracy are factored in.
Contamination Rate: Estimate the contamination rate in an outbound bale or sampled stream and see how far it sits from the broker or specification target.
Sort Line Conveyor Energy: Estimate the electricity cost of running a sort line conveyor or full conveyor train and convert it to cost per ton processed.
Screen Efficiency: Estimate the screening efficiency of a trommel, disc, or ballistic screen and see how far it sits from the design target.
Air Separator Energy: Estimate the electricity cost of running an air knife, air drum, or windshifter and convert it into a defensible cost per ton.
Baler Capacity: Estimate the on-spec bales per shift a horizontal or two-ram baler will produce after availability and density acceptance are factored in.
Reject Stream Cost: Estimate the total cost of handling and disposing of residue and reject streams from the MRF, including disposal tip fee and fixed haul cost.
Maintenance Downtime: Estimate the planned downtime minutes needed for a PM or repair window on the sort line, including realistic setup and delay allowance.
Optical Sorter Sensor Cleaning Interval: Estimate the minutes needed for a scheduled NIR or color sensor cleaning round across the sort line so accuracy stays inside spec.
Pick Line Labor: Estimate the manual pick time needed to clean a target stream at the sort cabin given a measured picks-per-minute rate.
Recovered Commodity Value: Estimate the gross commodity revenue from recovered material using inbound tons, commodity price, and the actual recovery yield for the stream.
Installation Labor: Estimate millwright and electrician labor minutes for installing or replacing MRF sorting equipment, conveyors, screens, or balers.

Common manufacturing problems solved

municipal solid waste
MRF
material recovery facility
recycling equipment
optical sorter
baler
screen efficiency
contamination rate
recovery rate
tons per hour

Live market signals for this industry

Steel mill PPI stands at 361.439 (BLS, Jun 2026), up 16.9% from a year earlier. New factory orders are up 7.4% year over year (Census).

Category questions

How do I calculate optical sorter throughput for a MRF line? Optical Sorter Throughput relates belt speed, belt width, and burden depth to tons per hour, then applies an ejection accuracy factor for the target material. Pushing throughput up raises burden depth, which reduces recovery because buried objects are hidden from the sensor. Most NIR and camera-based sorters have a rated tons-per-hour band per meter of belt width, so size against that band rather than a peak figure to keep recovery high.
What is a good contamination rate for MRF output, and how is it measured? The Contamination Rate calculator divides off-spec material in a bale by total bale weight, based on audit samples. Buyer specifications for recovered fiber and containers often cap contamination in the low single digits of percent, with penalties or rejection above that. Track it alongside Re-sort and Rework Cost, because pushing throughput to hit tons per hour usually raises contamination and forces costly re-sorting or bale downgrades that erode commodity value.
How does screen efficiency affect downstream recovery? Screen Efficiency measures the share of undersize material that correctly passes through a disc or trommel screen versus what carries over. Poor screen efficiency sends fines and small containers to the wrong stream, loading downstream optical sorters and pick lines and dragging recovery down across the whole plant. Because the first screens set the separation for everything after them, a few points of screen efficiency often matter more than any single downstream sorter.
How do I estimate recovered commodity value from a sort line? Recovered Commodity Value multiplies the tons of each grade recovered, fiber, PET, HDPE, aluminum, steel, by its market price, then nets out Reject Stream Cost for residue disposal. Aluminum recovered by the eddy current separator is usually the highest value per ton, so its recovery rate has an outsized effect on revenue. Use it with Contamination Rate, since off-spec material lowers the grade and the price the bales fetch.
How is processing cost per ton built up for a MRF? Cost per ton combines Pick Line Labor, Sort Line Conveyor Energy, Air Separator Energy, Maintenance Downtime, and Reject Stream Cost, spread across the tons processed. Labor and residue disposal are typically the largest levers, which is why automation like optical sorters is justified against Pick Line Labor. Run it with Capacity Gap to see whether the line can absorb more tons before another shift or an equipment upgrade is needed.

Last reviewed 2026-05-12.