Glossary · Manufacturing systems
Inline quality control
Also known as: In-line inspection, In-process inspection
German: Inline-Qualitätskontrolle
In manufacturing, inline quality control is the inspection or measurement of products or process characteristics directly within the production flow, often for every unit, so deviations are detected and acted on without taking samples to a lab.
- Manufacturing systems
In one sentence
Inline quality control inspects or measures products directly in the production flow, often every unit, to detect deviations early.
Example
A vision system checks every bottle cap for correct seating and rejects faulty bottles before they reach the case packer.
How it applies
- Engineering: Inline inspection uses sensors, Machine vision, checkweighers or gauges integrated into the line, with reject devices and feedback to upstream processes.
- Quality: 100 percent inspection finds defects that sampling misses, but it depends on the reliability of the measuring system. Measurement system analysis and regular functional tests confirm that the inspection works.
- AI: AI-based visual inspection is increasingly used. Its detection performance must be verified with representative samples and monitored over time.
- Documentation: Document inspection criteria, limits, test pieces and the reaction to failed tests. The operating manual should explain what an operator does when the inspection system raises repeated rejects.
Inline vs. offline quality control
Offline control takes samples to a lab or measuring room. Inline control measures in the flow. At-line inspection sits between the two: measured next to the line, shortly after production.