Chemical Migration
Saturated and aromatic fractions originating from recycled paper and board containers migrate into dry foods via direct contact and vapor phase transfer. Mineral oil hydrocarbons MOSH MOAH designate complex mixtures of petroleum derived compounds containing carbon chains that require stringent analytical chromatography during food packaging compliance audits. Uncoated virgin fibres prevent contamination pathways effectively because barrier coatings halt petroleum fraction transfer before dry goods absorb migrating substances.
Migration Barrier
Converter mills apply functional barriers using dispersion coatings to stop volatile petroleum compounds from reaching sensitive contents inside folding cartons. Food safety auditors test converting lines by measuring residual fractions in standard reference materials to verify that barrier efficiency meets regulatory migration thresholds. Converting plants adjust drying temperatures and coat weights on flexographic presses to eliminate pinholes in polymer films.
Such process adjustments prevent aromatic compounds from penetrating paperboard walls during prolonged ambient storage cycles.
Regulatory Compliance
Brand owners demand routine migration testing on finished packaging substrates to verify that petroleum residues remain below specified analytical detection limits. Analytical laboratories employ gas chromatography coupled with mass spectrometry to quantify saturated and aromatic fractions extracted from paperboard samples. Packaging producers face severe commercial penalties when routine tests reveal petroleum fraction levels exceeding established migration limits.
Continuous monitoring of raw material inputs prevents recycled fibre contamination from entering secondary carton converting streams.