What needs to be clarified
Describe film structure and accessible polymer layers against the stated design, noting spatial-resolution limits.
Materials to prepare
- Film fragments with inner and outer faces marked
- Declared layer and print sequence
- Unused comparison fragment from the same designated packaging
What to compare
Prepare a cross-section and measure visible layers. Obtain layer FTIR microspectra while checking adjacent-layer, adhesive and print contributions. Compare surface and section spectra, identifying layers too thin or damaged for separate identification.
Possible outcome of the analysis
A layer map may record thickness and spectral evidence, confirmed components, mixed signals and untested design elements.
Limits of the conclusions
Polymer detection establishes no food safety, service life or batch characteristics. Similar spectra identify no manufacturer; thin layers may require another technique.