Meaning
Food contact notification establishes a legally binding clearance for specific chemical substances migrating from polymer packaging into food matrices under defined migration limits. Regulatory bodies grant this authorization after evaluating toxicological dossiers submitted by resin manufacturers or converters. Compliance depends on maintaining exact resin purity and additive ratios declared in the original submission.
Resin Purity
Migration testing validates that low molecular weight oligomers and unreacted residual monomers stay beneath strict specific migration limits during high temperature food processing. Extrusion temperatures exceeding recommended profiles degrade polymer chains and generate volatile degradation products that void the clearance. Virgin polymer feeds minimize unpredictable contaminant spikes that plague recycled regrind streams containing unverified post consumer additives.
Moulding Compliance
Part specifications enforce tight melt temperature controls to prevent localized thermal degradation inside the barrel during high speed injection moulding cycles. Screw speed optimization ensures shear heating remains within safe operational envelopes for heat sensitive polyolefins. Barrel residence time fluctuations alter additive distribution uniformity and trigger localized blooming of slip agents on finished component surfaces.
Migration Thresholds
Analytical verification protocols measure residual monomer transfer into food simulant solutions using high performance liquid chromatography under standardized time and temperature conditions. Analytical drift during continuous production runs signals thermal degradation of processing aids and prompts immediate tool stoppage to prevent noncompliant finished goods. Regulatory audit failures trace directly back to undocumented masterbatch substitutions that introduce unapproved colourants outside the notification scope.
