Current condition
Start with the actual band specification and a complete pack and closure. Record how the band feeds and where it sits before the pack reaches the shrinking stage.

How should tamper-evident shrink-band application product behaviour be investigated before specifying shrink band applicators?
For Shrink Band Applicators, define the operating conditions for tamper-evident shrink-band application product behaviour: the normal state, credible extremes, how the relevant values or conditions are measured, and which decision or outcome they affect.
For routine production using tamper-evident shrink-band application, describe the realistic range and how changes in tamper-evident shrink-band application product behaviour affect the result you need.
Follow the same pack from band feeding and cutting through placement and shrinking. A band may sit correctly before shrinking and still finish outside the agreed position. Record both observations against the same sample reference.
Discuss your application

Start with the actual band specification and a complete pack and closure. Record how the band feeds and where it sits before the pack reaches the shrinking stage.
Compare representative material revisions, pack shapes and closures. Include a known difficult example and record which condition first changes the result.
If a finished pack is unacceptable, check the band position recorded before shrinking. Distinguish a placement issue from a change during shrinking or an effect on the product or pack.
Identify the band material and revision used. Record where a feeding, cut or placement issue first appears on a representative pack.
Try the band on its intended pack and closure. Keep the sample reference with the observations so the results can be traced to that combination.
Record the required band position before shrinking and the agreed finished appearance. Inspect the same pack for any unwanted change after heat is applied.
Keep normal pack spacing and the production pattern with the sample result. Note any change in behaviour during a stop or restart.
Repeat the observation after a relevant format or material change. Keep the first accepted pack or a record of its appearance.
Describe how a missing or misplaced band will be identified and which affected packs need review. Agree the checks before production resumes.