Chromatographic Verification of Photoinitiator Specific Migration Limits in Printed Barrier Packaging
Chromatographic testing via LC-MS/MS verifies photoinitiator specific migration limits in printed barrier packaging to maintain compliance.
Functional Barrier Layers
Protective Action
Prevention of chemical migration from recycled board or printed surfaces into packaged goods is achieved by incorporating a low permeability material on the inner surface. Such functional barrier layers block the passage of mineral oils or plasticizers during the shelf life of the product. The chosen material must maintain its continuous structure under typical storage and handling temperatures.
Material Selection
Polymer coatings or metal foils represent the primary physical barriers used in commercial packaging. Extruded polymers like ethylene vinyl alcohol or ultra thin aluminium foils provide high resistance to gas and chemical transport. Applying functional barrier layers allows the use of cheaper recycled paperboards for the structural outer box without risking food contamination.
Efficiency Verification
Verifying the performance of a protective coating requires long term migration testing under accelerated aging conditions. Analysts measure the transfer of specific marker substances through the barrier layer into food simulants over a set period. If the marker concentrations remain below the detection limit, the protective layer is considered effective for that packaging configuration.
A single pinhole or crack in the coating can compromise the entire structure and lead to localized failure. For this reason, converters run automated inspection systems to detect surface voids during the high speed coating process.