Meaning
Polymer compliance data standard European Union 2022 1616 establishes chemical migration limits for recycled plastic materials intended for food contact applications. This regulation sets maximum specific migration thresholds for contaminants passing from polymer matrices into foodstuffs during storage and thermal processing. Enforcement applies exclusively to food packaging manufacturers and resin reprocessors operating within the single market.
Thermal Processing Parameter
Extrusion barrel temperature profiles dictate the degradation rate of recycled polymers before pelletization occurs. Excessive heat history breaks polymer chains, generating volatile oligomers that subsequently violate migration thresholds. Operators adjust melt temperature zones to prevent thermal scission while maintaining sufficient shear for homogenous compounding.
Regrind Economics Tradeoff
Virgin resin pricing encourages compounders to maximize post-consumer flake incorporation despite higher contamination risks. Recycled batches demand extensive cleaning infrastructure, washing chemistry, and vacuum devolatilization to strip residual organic compounds. Lower feedstock costs offset washing expenses until volatile contaminant levels exceed regulatory limits and trigger full batch rejection.
Process Variable Drift
Injection moulding cycle times influence crystallinity and residual stress within the finished packaging article. Mold temperature fluctuations alter molecular orientation, changing the diffusion coefficient of trapped chemical species. Accelerated cooling reduces amorphous regions, trapping mobile contaminants and preventing their migration toward food contact surfaces.
