Home/ Case Studies/ Vision QC for recycled materials
Manufacturing

Contamination dropped 41% in the first quarter live.

A regional materials recovery operator was losing margin on rejected loads. We put cameras and a grading model on the conveyor — and put the sorting team back in front of the screens that actually matter.

At a glance

What changed after one full quarter on the line.

41%Drop in contamination flagged by downstream buyers on shipped loads
18%Lift in saleable yield on the mixed-plastics stream
50%Manual sorting hours reclaimed and redeployed to exception handling
3.2 secEnd-to-end latency from camera frame to operator alert
Context

Grading was a judgement call — made hundreds of times an hour.

A regional manufacturer of recycled materials runs a high-throughput MRF and ships baled streams to converters across the country. Contamination grading — the call on how much non-target material sits in a bale of HDPE or OCC — was being made by line sorters under fluorescent lights, on a conveyor moving faster than anyone wanted to admit. The accuracy was fine on average and terrible on the tails.

The tails were what hurt. A rejected load came back at the operator's cost, plus reload, plus the buyer's patience. Three of their five biggest accounts had started running their own incoming-load QA, and the rejection rate on a few SKUs had crept past what the commercial team could absorb.

They had looked at off-the-shelf sorting systems. Two problems: the systems graded by composition but didn't track grade against supplier, and the alerting was a flashing light at the end of the line — too late to do anything about it.

"Our sorters could feel a bad load before they could prove it. We needed a system that produced the proof — and produced it before the bale was tied."
What we built

Cameras, edge inference, and a dashboard the floor actually opens.

A vision pipeline that grades each stream in real time, routes contaminants where the existing sorters can catch them, and writes a per-supplier scorecard the commercial team can argue from.

Line-side cameras

Industrial line-scan and area cameras mounted over each conveyor segment, with stable lighting and a calibration target the maintenance team can re-run in under a minute.

Edge inference

Jetson devices running the grading model on-prem. No round-trip to the cloud, no dependency on the plant's internet during a shift.

Grading model

A segmentation model trained on the operator's own material mix, retrained on a monthly cadence as feedstock composition shifts with the seasons.

Ops dashboard

A floor-mounted display per line showing current grade, drift against target, and which infeed batch is responsible. Built to be read at fifteen feet.

Supplier scorecard

Every inbound load is graded and attributed back to the hauler and the source contract. The commercial team gets a weekly export they can actually negotiate with.

Alerting

Real-time triggers to the line lead's radio when a stream drifts out of spec, with a clip of the offending frames attached for the post-shift review.

How we delivered it

Four phases, two lines first, then the whole plant.

Phase 1

Discovery

Two weeks on the plant floor with the sort team. We labelled a starter dataset on three streams and pinned down which contamination categories actually drove rejections.

Phase 2

Pilot

One conveyor line, one shift. The model ran in shadow mode for three weeks, with daily reviews against the sort team's calls. By the end, agreement was tighter than human-to-human inter-rater.

Phase 3

Hardening

Edge deployment, MQTT into the plant's existing OT bus, automatic failover to a known-good model if a camera fault is detected. A maintenance runbook the plant team actually owns.

Phase 4

Rollout

Four additional lines, the supplier scorecard for the commercial team, and a retraining pipeline the plant's data lead now operates with a weekly check-in from us.

The result

The plant stopped arguing with buyers and started arguing with suppliers.

Within a quarter, the rejection log on the operator's three largest accounts had gone from a weekly conversation to a monthly one. The grading didn't change — the visibility did. When a load was off-spec, the team knew which infeed batch had caused it, which supplier had delivered the infeed, and what the contamination category was, all before the bale left the floor.

The commercial team's first real win came eight weeks in: a hauler whose loads were consistently grading 3 points below contract was renegotiated, with the scorecard as the evidence. That single conversation paid for the project. The sort team, meanwhile, stopped being graders and became exception handlers — a job most of them found materially less awful.

97.4%Agreement between the model and a panel of senior sorters on a blind eval set
11.5 moPayback period including hardware, integration, and the first year of model upkeep
5 linesNow running the full pipeline, with two more scheduled for next quarter
Why they re-engaged us

"They built it on our floor, with our people, and then they handed it over."

After the first plant landed, the operator brought us back for a second site and a supplier-onboarding workstream. The reference is available — call us.

Talk to a reference →

"Most vendors hand you a dashboard and a phone number. East Reach handed us a model, a retraining pipeline, and a sort lead who knew how to run both. That's the difference."

J. Velasco Plant Manager · Regional MRF operator

Request the full case study.

Hardware bill of materials, model architecture notes, and a redacted week of the supplier scorecard — sent over after a short call.

Schedule a Free Meeting →