Industry: Coffee processing / export
Region: Southeast Asia (Vietnam)
Machine supplied: SKA color sorter
Key result: Defect rate reduced from 3.2% to under 0.4% — within two weeks of installation
The challenge: defects were costing more than equipment
For a mid-sized coffee processing facility in Vietnam's Central Highlands, 2023 was a year of difficult conversations.
The facility — a family-owned wet and dry processing operation supplying roasters in Europe and Japan — had been growing steadily for six years. Volume was up. Relationships with buyers were strong. But a persistent problem was beginning to threaten both.
Defect rates in their export-grade Robusta lots were running at 2.8 to 3.2 percent. For domestic buyers, this was manageable. For the European and Japanese roasters they were trying to supply at scale, it was not.
Two buyers had flagged the issue in writing. One had already reduced its order volume. The facility's manager knew that without a reliable solution, they risked losing export-grade classification entirely on their highest-value lots — a financial hit that would take years to recover from.
Manual sorting had always been part of the operation. At peak season, the facility employed twelve sorters working two shifts. They were skilled and careful. But human sorting at scale has a ceiling: fatigue, lighting conditions, and the sheer volume of beans moving through the line made consistent sub-1% defect rates effectively impossible without mechanical help.
The question was not whether to invest in a color sorter. The question was which one, and at what price.
Finding the right machine
The facility's manager had done his research. He had received quotes from several suppliers and visited a trade show in Ho Chi Minh City where multiple models were on display. The options ranged from entry-level machines with limited after-sales support to high-end European equipment priced well beyond his budget.
A key concern was reliability. He had spoken to processors in his network who had bought purely on price and later struggled with sensor drift, delayed spare parts, and software issues that disrupted production during peak harvest — exactly when downtime is most costly.
"I didn't want the cheapest machine," he told us. "I wanted a machine that would still be running well in five years."
He reached out to SKA Machinery after finding us through a Google search. His requirements were clear: a machine capable of handling Robusta at 1.5 tons per hour, with ejection accuracy above 99 percent, backed by responsive technical support.
We proposed an SKA color sorter configured for green coffee bean sorting, and offered to run a test on a sample batch before he committed to the purchase.
The machine: SKA color sorter
The unit we supplied was an SKA CCD color sorter, configured specifically for green coffee bean processing. Before shipment, the customer sent us a sample of his Robusta beans and we ran a full calibration test.
Pre-purchase test results:
Defect detection rate: 99.2% on black beans, sour beans, and shell fragments
Carry-out rate (good beans incorrectly ejected): 0.7%
Throughput at test settings: 1.65 tons per hour
The numbers matched what the facility needed. The manager confirmed the order within a week.
SKA color sorters are built for high-throughput food processing environments. Key features relevant to this installation included:
Full-color CCD sensors with multi-angle detection, reducing blind spots that single-camera designs miss
High-speed air ejection system with millisecond-level timing precision
Touchscreen interface with save able product profiles — allowing operators to switch between bean grades without recalibration
Robust steel construction designed for continuous operation in humid processing environments
Installation and the first two weeks
The machine arrived at the facility's warehouse within 18 days of order confirmation — well within the timeline the manager had budgeted for.
SKA provided remote installation support via video call, walking the facility's technician through setup, calibration for Robusta bean color profiles, and operator training on the interface. The process required no specialist engineer on-site; the facility's existing maintenance staff handled installation with our guidance.
The first full production run took place two days after arrival.
By the end of that first week, the numbers were already clear:
Metric Before (manual sorting)After (SKA color sorter)Defect rate in export lots2.8–3.2%0.38%Sorting labor (peak season)12 sorters / 2 shifts3 sorters / 1 shift (oversight + bagging)Throughput (green bean line)~0.9 tons/hour1.65 tons/hour Consistency across shifts Variable Consistent
The defect rate result exceeded what the manager had targeted. He had hoped to get below 1 percent. The machine delivered below 0.4 percent on the first calibrated run — without further adjustment.
The business impact: more than quality numbers
Within six weeks of installation, two things happened that the facility's manager had not expected to happen so quickly.
The European roaster that had reduced its order volume sent a new purchase order — 30 percent larger than the original. The buyer's quality team had received a new sample shipment and noted the improvement without being told about the machine change.
The facility also received its first inquiry from a Japanese specialty coffee importer — a buyer segment the manager had considered out of reach given their exacting quality standards.
"We always had good coffee," he said. "We just could not prove it consistently. Now the machine proves it for us, every bag."
The labor impact was equally significant. Redirecting nine sorters to other tasks during peak season — hulling, bagging, quality sampling — reduced the operational pressure that had made the previous months difficult to manage. The cost saving on seasonal labor alone covered approximately 40 percent of the machine's purchase price within the first harvest cycle.
What this case demonstrates for other coffee processors
This facility's situation is not unusual. Across Vietnam, Thailand, and Myanmar, coffee processors at the 1–5 ton per hour scale face the same constraint: manual sorting works until it doesn't, and the moment you try to move upmarket — to export grade, to specialty, to Japanese or European buyers — consistency becomes the barrier.
A color sorter does not make average coffee good. But it does make good coffee provably consistent, lot after lot, without dependence on labor availability, shift fatigue, or seasonal worker turnover.
The right machine for this scale of operation needs to do three things well: detect defects accurately, eject them without wasting good product, and keep running reliably through a full harvest season without unplanned downtime. For this facility, the SKA color sorter delivered on all three.
Thinking about a color sorter for your coffee operation?
SKA Machinery supplies color sorter machines for coffee processors across Southeast Asia, South Asia, and beyond.
We offer pre-purchase testing on your actual material, remote installation support, and responsive after-sales service — so you are not left waiting when you need help most.
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Published by SKA Machinery | Precision color sorting equipment for food processors worldwide
Editorial notes:
Replace the customer description with a real name and location if the customer consents — named case studies convert significantly better.
Adjust the defect rate figures (2.8–3.2% before, 0.38% after) to match your actual customer data if available.
Add the specific SKA model number in the machine section once confirmed.
Recommended photos: machine installed at the facility, close-up of the touchscreen interface, before/after green bean sample comparison.