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Line changeover is the work of switching a production line from one product to the next. Line clearance is the check that confirms no product, label or packaging from the previous run remains before the next run starts. In allergen-safe food manufacturing, clearance is the control that prevents cross-contact between runs, so it needs a written procedure, verification and a signed record.
This guide separates the two terms, gives a numbered clearance procedure, shows how to match the effort to the allergen risk, and includes a sign-off record you can adapt. It sits alongside our guide to allergen management for food manufacturers.
Line Changeover vs Line Clearance
| Term | What it is | Typical output |
|---|---|---|
| Line changeover | The full switch from one product to another: stop, empty, clean, adjust equipment, change tooling, change packaging and labels, start up | Line ready to run the next product |
| Line clearance | The inspection step inside the changeover that confirms the line is free of the previous product, labels, packaging and paperwork | Signed clearance record |
| Allergen changeover | A changeover where the allergen profile changes, so cleaning is verified to remove the allergen | Clearance plus cleaning verification result |
Under the U.S. preventive controls rule, 21 CFR 117.135(c)(2) calls for food allergen controls that prevent allergen cross-contact during storage, handling and use, and that make sure finished food is labeled correctly. Changeover and clearance are where that requirement becomes a daily task on the line.
Match the Changeover to the Allergen Risk
Not every changeover needs the same effort. Decide the level in your allergen plan, not on the day.
Line Clearance Procedure: Numbered Steps
- Stop and secure. Stop the line, lock out equipment where needed and put a changeover tag on the line.
- Remove product. Take off all finished product, work in progress, rework and ingredients from the previous run.
- Remove labels and packaging. Clear every label, film, carton and printed code that belongs to the previous product. Reconcile counts so none are unaccounted for.
- Clean to the written method. Dry clean first, then wet clean and rinse as the sanitation procedure requires. Disassemble parts that trap residue.
- Inspect visually. Check food-contact surfaces, seams, hoppers, chutes, conveyor undersides, scales, and the floor and drains near the line.
- Verify where required. For allergen changeovers use the verification your plan specifies, such as an allergen swab or ATP check.
- Set up the next product. Load the correct recipe, labels, packaging and settings and check the first-off.
- Sign off. The operator and a second person (QA or a supervisor) sign the clearance record before the run starts.
Verifying an Allergen Changeover
A clean-looking line is not proof. Verification options include a visual inspection by a trained person, an ATP test that shows whether organic residue remains, and an allergen-specific swab test. ATP does not detect an allergen directly, it shows general cleanliness, so use it alongside the method your allergen plan names. Our guide to ATP testing and cleaning validation explains what ATP can and cannot show. Whatever you choose, write the pass criteria down before the first test.
Line Clearance Sign-Off Record
| Field | What to capture |
|---|---|
| Line and date/time | Line ID, start and end of the changeover |
| Previous and next product | Product names, lot codes and allergen profiles |
| Level of changeover | Standard, clean-and-sign-off, or full clean with verification |
| Checks completed | Product removed, labels and packaging cleared, cleaned, inspected |
| Verification result | Visual, ATP or allergen swab result and the pass criteria |
| Done by / released by | Operator and second-person signatures with time |
Shortening Changeover Time Without Cutting Corners
The lean idea of SMED (single-minute exchange of dies) is to separate setup work that can be done while the line is still running from work that needs it stopped. Staging the next product's labels and packaging, pre-weighing ingredients, keeping cleaning tools at the line and using color-coded or dedicated tools for allergens all shorten the stop. Never trade away the verification step for speed: a fast changeover that causes a recall costs more than a slow one.
Making the Record Easy to Complete
The weak point is usually the paperwork: a sheet that is filled in after the fact, or not at all. In IONI an operational check can be triggered at the start of a batch and completed by the operator on the floor with a pass or fail, photos and notes, so the clearance record exists before the run begins. See our guide to digital SOPs and work instructions for how to put the procedure itself at the line.
FAQ
What is the difference between line changeover and line clearance?
Changeover is the whole switch from one product to the next. Clearance is the check inside it that confirms the line is free of the previous product, labels and packaging.
Is line clearance required for food manufacturers?
Allergen cross-contact controls and sanitation controls under 21 CFR 117.135 and your food safety plan require you to prevent contamination between runs, and line clearance is the usual way to do it and to prove it.
How do you verify an allergen changeover?
With the method in your allergen plan, commonly visual inspection plus an allergen swab test, sometimes with ATP as a general cleanliness check.
Who should sign off a line clearance?
The person who did the work and a second person such as QA or a supervisor.
How can we reduce changeover time?
Prepare the next run while the line is still running, keep tools at the line and standardize the steps. Do not skip verification.
Last updated: October 14, 2026
Put the clearance check on the floor, not in a binder. Explore IONI's production and traceability software for food manufacturers.
