A useful bottle-washer trial uses a traceable sample set, controlled operating conditions and an agreed method for deciding whether each bottle passes.
A bottle-washer trial should prove a specific point: whether a machine can handle the intended bottles, remove the defined contamination, achieve the required moisture condition or support the target line arrangement. A trial that starts without a written question can produce attractive photographs without producing a defensible machine decision.
For food and drink projects, the customer’s own hygiene and product-safety system remains responsible for deciding what evidence is sufficient. The UK Food Standards Agency’s MyHACCP prerequisite guidance is a useful general reference for equipment suitability, cleaning and maintenance, but it does not replace a site-specific validation.
The sample set should expose the variation the production line is expected to manage.
| Sample group | Purpose | Identification to record |
|---|---|---|
| Clean reference bottles | Confirm dimensions, handling and the acceptable starting appearance | Format, supplier or source, batch where known and measured dimensions |
| Typical contaminated bottles | Represent the condition expected most often | Previous product, storage time, residue location, label and adhesive |
| Worst credible bottles | Challenge the process boundary without introducing an unrealistic outlier | Why the bottle is worst case and how often it occurs |
| Format extremes | Check the smallest neck, largest body, least stable base or difficult shoulder | Drawing, dimensions and intended production family |
| Known rejects | Verify sorting and rejection rather than trying to recover an unsafe bottle | Defect category and required reject point |
When bottles from different labels, residues or storage ages are mixed, the result cannot be traced to the condition that produced it.
A clean result may not be reproducible if temperature, chemistry, speed and nozzle position were all changed without a controlled record.
A line decision should count bottles that meet the acceptance criterion after washing, drainage, inspection and any agreed reject stage.
Each answer states the decision first, then explains the evidence and limitations that change it.
A representative bottle sample covers the formats, contamination levels, labels, ages and handling conditions that materially affect the real process. It should include the typical population and the credible extremes, not a random handful of clean bottles.
The sample record should explain why each group was selected and how frequently it is expected in production. If a rare bottle is outside the intended process, classify it as a reject instead of allowing it to define the whole machine.
Worst-case bottles should be included when they are genuinely expected and safe to handle, because they define the process boundary. They should not be artificial examples chosen only to make the test fail or unknown hazardous bottles sent without prior agreement.
Identify what makes the bottle worst case—dried residue, narrow neck, old adhesive, unstable base or another factor—and keep it separate from the typical sample group.
Bottle identity, inspection timing, measurement method and all process variables not under investigation should remain as stable as practical during comparison trials. This allows the observed difference to be linked to the variable that was deliberately changed.
If a variable cannot be held fixed, record the deviation and avoid claiming a precise comparison. The test report should make uncertainty visible rather than smoothing it into one pass/fail total.
Capture the sample identity, machine settings, operating conditions, before-and-after condition, rejects, photographs, observations and acceptance decision before bottles leave the trial area. Once samples are mixed, dried further, handled or discarded, important evidence may be lost.
Retain agreed reference samples where safe and practical, and make sure photographs include enough context to identify the bottle group and inspected surface.
Use the next guide that matches the unresolved process, equipment or acceptance question.
Continue with the related bottle-washing guidance for the next project decision.
Continue with the related bottle-washing guidance for the next project decision.
Continue with the related bottle-washing guidance for the next project decision.
Send bottle photographs or samples, dimensions, incoming condition, required result, target output, utilities and the surrounding line so Lancing can assess the appropriate route.
Request a project-specific review