What we have written on the cold chain27 / 154

Link event evidence to a verified root cause, action owner and date, then to an effectiveness check.

Below its glass transition temperature a plastic stiffens and meets a knock by cracking instead of flexing. Polypropylene turns brittle around 0 °C; polyethylene stays tough even in a freezer.

Observe a sample loading task; record bends, turns and steps, then compare the layout change on site.

When two loggers diverge, verify identity, time basis and position, then examine when the difference begins within the same run.

Link production, product preparation, loading and delivery times in one batch record; interpret container readings within that timeline.

Separate containers still on route from empties waiting at branches. Measure return, washing and release times by dispatch cohort.

Record breakdown, transfer and replacement vehicle readiness times; assess product condition separately from container readiness.

When SKU, material, plates or layout change, document whether the prior qualification still applies.

Record unloading, outdoor exposure and in-store waiting by product lot and handover owner.

UV ageing is permanent and builds up in impact strength before it shows anywhere else. The material code, the carbon black or UV stabiliser and a Charpy test show how far the ageing has gone.

Review rail height, plate model and repetition together; arrange the task through the site risk assessment and record strain findings.

When missing data clusters on one container, match logger identity, the container label and sensor position against run records.