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.
Activated Carbon Retention
Adsorptive Capacity
Adsorption mechanisms in recycled paperboard substrates capture volatile mineral oil hydrocarbons within internal pore structures to prevent gas-phase transfer into dry foodstuffs. Virgin cellulose networks often lack the necessary high surface area sites required to bind low molecular weight substances, whereas integrated particulate carbon creates physical traps. Activated carbon retention measures the functional mass percentage of active carbon particles immobilized within the fibre matrix during wet-end papermaking.
Standard laboratory evaluations subject the paperboard to controlled thermal conditioning to verify that hydrocarbon vapor pressure remains below threshold limits. Retention failures allow mineral oil saturated hydrocarbons to cross the internal air gap between packaging and food.
Barrier Mechanism
Chemical retention chemicals added at the wet end bind fine activated carbon particles directly to the anionic cellulose fibres through charge neutralization and micro-polymer bridging. Unbound particles wash through the forming wire into the white water loop, causing process contamination and reducing functional barrier performance. Adding cationic starch alongside dual-polymer systems increases the binding strength of activated carbon retention, holding particulate matter securely within the sheet during pressing and drying.
High shear forces during agitation disrupt micro-flocs, which releases unattached carbon into the water system and lowers the final internal surface area. Solid state mass balance testing confirms how much active adsorbent remains permanently fixed in the dry structure.
Porous Boundary
Internal pore saturation limits total hydrocarbon binding over extended storage periods. Once the high surface area carbon sites reach equilibrium, volatile vapor migrates freely through the paperboard matrix. Activated carbon retention dictates the total operational lifetime of the passive barrier prior to thermal exhaustion.