What needs to be clarified
Check the degassing assembly, seams and repeatability of shape changes, separating packaging observations from coffee-quality questions requiring separate product examination.
Materials to prepare
- Unopened packs from an identified lot with different swelling levels
- Pack and valve specifications plus roasting and packing information
- Storage-temperature records and photographs before movement
What to compare
Record shape, damage, valve-area contamination and seams without squeezing. Select leak and valve-operation tests suited to the design. Compare samples under identical conditions; document opening and product sampling separately. Air escaping under strong hand pressure alone is not a valve-performance assessment.
Possible outcome of the analysis
A packaging and valve protocol may offer technical explanations for shape changes and propose separate product analyses if the quality question remains unresolved.
Limits of the conclusions
Swelling proves neither spoilage nor sound coffee. Valve examination does not establish safe consumption; prior puncturing or squeezing can destroy evidence of the original pack condition.