Migration Testing Conditions That Do Not Match Your Filling Line
Matching migration simulant and thermal parameters to exact filling line mechanics prevents compliance invalidation during customs and market audit checks.
Polyolefin Saturated Hydrocarbons
Polymer Barrier
Paraffin waxes and high molecular weight paraffinic chains form a dense internal matrix within barrier coatings applied to paper substrates, protecting cellulose fibres from aqueous migration. Polyolefin saturated hydrocarbons act as the principal hydrophobic agent in extrusion coatings and aqueous dispersion formulations designed for greaseproof packaging. Chemical inertness prevents these long chain molecules from interacting with food oils or printing inks during conversion processes.
Crystallinity levels determine the moisture vapor transmission rate across folding boxboard grades used in frozen food packaging.
Extrusion Coating
Molten paraffinic polymers demand precise thermal control during extrusion onto paperboard surfaces to ensure uniform film thickness without pinhole formation. Calender rolls press the hot hydrocarbon layer into the surface pores of the substrate, locking the coating onto the fibrous matrix before cooling sets the crystalline structure. Processing temperatures must exceed the melting point of the specific hydrocarbon blend by twenty degrees Celsius to achieve proper adhesion without thermal degradation.
Coater speed directly influences coating weight consistency across wide webs running at high commercial volumes.
Migration Threshold
Regulatory compliance limits the transfer of low molecular weight fractions from packaging coatings into dry or fatty foodstuffs during extended shelf life storage. Analytical testing measures residual extractables using solvent immersion methods to verify that hydrocarbon fractions remain below legal migration limits for food contact materials. Substrate density and barrier thickness dictate the maximum allowable contact time before temperature fluctuations induce molecular diffusion through the paper matrix.
Regulatory frameworks establish strict thresholds for total extractable matter to prevent organoleptic contamination of packaged goods.