Implementing a line-clearance procedure
A line-clearance procedure is a documented check performed between production runs to confirm that all materials, components, labels and product from the previous run have been removed before the next begins. It prevents mix-ups and cross-contamination, and is a core control in regulated and food manufacture.
What it is
Line clearance is the formal verification that a line is clean and empty of the prior product before a new one starts. It covers physical removal of leftover materials, packaging and documentation, confirmation of the correct new materials, and an independent check that nothing from the previous run remains. The result is recorded, often with a second-person verification, as evidence the line was cleared.
Why it is done
A residual unit, label or component from a previous run can end up in the wrong product, causing a serious mix-up — the wrong tablet in a blister, an undeclared allergen in a food pack, or mislabelled product reaching customers. The consequences range from costly recalls to patient or consumer harm, so line clearance is a non-negotiable control wherever product or label changeovers occur.
How it is done
A checklist defines every item to be removed and every confirmation required between runs. At changeover the line is physically cleared of all prior materials, components, printed matter and product, and the area and equipment are checked against the list. The correct materials for the next run are confirmed present, an independent person verifies the clearance, and the signed record is retained before production is authorised to start.
- Define clearance checklist
- Remove prior materials
- Check area and equipment
- Confirm new materials
- Independent verification
- Record and release
What to watch for
Self-verification without an independent check is the weak point, since the person who cleared the line is least likely to spot what they missed. Treating clearance as a rushed formality under schedule pressure, and overlooking small items like stray labels or rejects in chutes, are the failures behind most mix-ups.
Related practices
Reducing changeover time with SMED
Optimising clean-in-place (CIP)
Running a process capability study
Related topics
Poka-Yoke (Mistake-Proofing) · Standard Work · Predictive Quality
Common in: Pharmaceuticals · Food Processing · Dairy · Brewing & Beverage · Chemicals