Analytical Protocol
Laboratory evaluation of recovered fiber packaging material measures chemical safety parameters and mechanical strength properties of paper stock. Executing recycled paperboard testing identifies mineral oil hydrocarbons and heavy metal traces derived from post-consumer waste streams. Standardized extraction protocols evaluate chemical migration into food simulants under controlled temperature and time conditions.
Physical testing measures burst strength and bending stiffness to ensure structural performance during converting.
Contaminant Identification
Post-consumer paper streams contain residues from printing inks, adhesives, cleaning agents, and plastic laminates. Standard recycled paperboard testing isolates non-intentionally added substances that threaten food packaging safety. Solvent extraction combined with gas chromatography quantifies saturated and aromatic mineral hydrocarbons migrating from recovered newsprint inks.
Spectroscopic methods detect residual heavy metals and photoinitiators present in recycled fibers. Moisture content and cobb sizing values indicate water absorption resistance, which influences board runnability on converting machinery. Fluorescent whitening agents and plasticizers require liquid chromatography screening to verify compliance with regional food contact material regulations.
Microscopic fiber analysis determines the ratio of softwood to hardwood pulp in secondary fiber blends.
Physical Safety
Food safety regulations mandate strict limit compliance for paperboard packaging produced from secondary fibers. Systematic recycled paperboard testing verifies that functional barrier coatings effectively block hydrocarbon migration into food products. Testing frequency depends on mill raw material variability and target packaging applications.
Quality assurance certification prevents non-compliant paperboard lots from entering food distribution chains.
