Fluid movement
Liquid and gaseous matter navigate through interconnected porous rock formations within the earth crust. Hydrocarbon migration involves the movement of oil and natural gas from source rock towards permeable carrier beds or traps where accumulation occurs. Geological pressure gradients and buoyancy forces dictate the speed and direction of this travel.
Substrate interaction
Oil-based substances sometimes interact with packaging materials during contact or long-term storage when protective barriers fail. Hydrocarbon migration describes the physical passage of chemicals from ink resins or lubricants into fibrous paper and board structures. Converting operations that select low-volatile components for inks reduce the risk of unwanted chemical transfer during the production of folding cartons.
Recycled fibre sheets often contain residual mineral oils that require specific functional barriers to prevent uptake by the packaged contents. High density coatings provide the required resistance to stop this molecular flow at the surface of the print stock.
Regulatory requirement
Food safety standards mandate limits on the amount of oil components allowed to move into food contact materials. Suppliers assess the efficacy of barrier films by measuring how much substance penetrates a test layer over time under elevated temperature conditions. Authorities track these outcomes to ensure that final packaging designs maintain consumer health.
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