Quality is controlled against an approved specification, not a generic promise.
Dimensional checks
Length, width, thickness, folds, seals, roll width, core, winding and agreed tolerances.
Seal and appearance
Checks may include incomplete seals, leakage paths, burn-through, cut quality, wrinkles, bubbles, pinholes and winding condition.
Print control
Artwork, text, registration, missing print, ink transfer, smudging and agreed colour references.
Functional verification
Vacuum retention, electrostatic performance, rust prevention, shrink behaviour, temperature or barrier performance are assessed only by agreed methods applicable to the selected structure.