Predicting Set off Migration in Stacked Packaging Board under Non Uniform Compression
Predicting set-off migration requires calculating local pressure peaks across board caliper variations to set safe pile heights and barrier coat weights.
Swiss Ordinance Compliance
Regulatory Boundary
Federal law governs the purity of chemical substances intended for contact with food surfaces or household goods through specific migration limits. Swiss ordinance compliance defines the threshold at which additives and components avoid toxic accumulation in a substrate. Producers verify that finished packaging material meets these legal conditions to ensure safe release of compounds during normal use.
Performance Metric
Chemical migration tests calculate the amount of a substance transferring from a printed or coated surface into a food simulant under controlled time and temperature. Swiss ordinance compliance requires that the total weight of mobile substances stays below a fixed milligram per square decimeter limit. Laboratories utilize gas chromatography or mass spectrometry to isolate individual monomers and photoinitiators that risk exceeding these safe exposure levels.
Compliance Methodology
Printers and converters rely on the declaration of compliance provided by ink and coating manufacturers to validate the chemistry of every layer. Swiss ordinance compliance rests upon the presence of audited substance lists that prove every component belongs to a pre-approved group of food safe chemistry. This verification process remains effective as long as the application process follows the recommended film weight and curing speed.
Accurate assessment of these chemical interactions provides the only objective validation of safety for mass produced consumer goods.