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| Observed symptom | Inspect first | Useful evidence |
|---|---|---|
| Corners lift after filling or cooling | Container curvature, surface moisture and timing | Edge photos before and after the process step; surface temperatures. |
| Label detaches from a rough or dusty surface | Actual contact area and contamination | A surface sample and the normal cleaning/application method. |
| Adhesive remains after removal | Surface finish, time attached and removal conditions | Before/after photos before cleaning; dwell time and temperature. |
| Barcode becomes unreadable but label stays on | Printing, rubbing, chemicals or heat | Printed control sample and exposure history; this may not be an adhesive failure. |
Name the actual substrate
Plastic is not a complete surface description. Identify the polymer if known, any paint or varnish, and whether the container is new, reused or cleaned. Do not assume that an adhesive suitable for one container finish will behave the same way on another. Ask the packaging supplier about coatings or additives if their identity is unclear.
- Send an unlabelled container alongside the failing label when practical.
- Describe dust, oil, release agents or cleaning residues without assuming which caused the failure.
- Record a squeeze, corner, seam or tight curve that the label crosses.
Separate application from storage
The label first has to attach under the conditions at the labelling station. Storage conditions come afterwards. A cold room setting does not tell you whether the pack was dry or frosted when labelled. For a cold-chain trial, retain the sequence: filling, labelling, time before chilling, frozen storage and thawing.
- Measure or record the pack-surface temperature, not just ambient air.
- Note when condensation or frost appears.
- Compare the finished label before and after each agreed stage, using the same container type.
Use construction restrictions to narrow the trial
One documented white PE construction calls for prior testing on low-surface-energy PP/PE, rough or irregular surfaces and tight curves below 5 cm diameter. That restriction must not be generalized to every PE label. Freezer-adhesive and removable BOPP are different directions; neither replaces a test of the actual surface.
- Read construction-specific notes before transferring a successful result to another material.
- For removal, agree the intended dwell time and what clean removal means.
- For tyre tread and textured drums, start from the dedicated application questions rather than a smooth-container assumption.
Change one variable and record the result
Compare a current label with the proposed sample on matched surfaces. Use the same application pressure or method, label size and observation schedule. If the cleaning method changes at the same time as the adhesive, the trial cannot tell you which change mattered. Keep the control sample even if the new label initially looks better.
- Record edge lift, detachment, residue and print damage as separate observations.
- Photograph with enough context to identify the container and failure location.
- Agree acceptable outcomes before the trial; do not invent a universal peel-force target.
Sources and scope
Model examples use the linked RT construction records. The checklist is a proposed observation plan, not a report of completed tests. Confirm the current grade and specification before a trial.