Mineral Oil Analysis in Recycled Fibre Food Packaging
Verify MOSH and MOAH compliance in recycled fibre packaging using accredited HPLC-GC-FID testing, validated functional barriers, and complete declarations of compliance.
Offset Ink Contamination
Residue Origin
Inks formulated with non-vegetable mineral oil distillates release volatile hydrocarbon compounds during drying and storage processes. Printing presses operating with conventional sheet-fed offset inks deposit mineral oils that remain bound within printed paper networks. Offset ink contamination occurs when mineral oil saturated hydrocarbons and aromatic hydrocarbons migrate from printed paper surfaces into internal packaging matrices or adjacent food products.
Set-off migration during reel storage or carton stacking transfers uncured ink components directly from printed outer surfaces to unprinted inner surfaces. Using low-migration vegetable-based offset inks eliminates primary mineral oil sources from commercial printing operations.
Recycling Recurrence
Recycling operations reprocess post-consumer printed matter containing conventional offset ink residues into recycled paperboard furnish. Standard deinking processes remove solid ink pigments effectively but leave mineral oil hydrocarbon distillates trapped within recovered pulp fibres. Managing offset ink contamination requires paper mills to blend clean virgin pulps or incorporate internal adsorbent fillers during papermaking.
Gas chromatography analysis monitors residual mineral oil levels in finished paperboard lots to verify suitability for dry food packaging applications. Untreated recycled fibre stocks carry high baseline hydrocarbon concentrations that exceed statutory safety guidelines.
Isolation Threshold
Packaging converters deploy functional barrier coatings or aluminum foil laminates to block migrant transport from contaminated paperboard. Inadequate barrier integrity allows volatile hydrocarbons to permeate through the inner packaging structure over extended storage periods. Offset ink contamination represents the primary source of mineral oil residues found in recycled paper packaging.