Oxidative Loss
Polymeric surface energy decline following electrical treatment represents a progressive thermodynamic reversal of functional polar groups on extruded film substrates. Corona discharge decay begins immediately after high voltage excitation because low molecular weight oxidized fractions migrate inward toward the bulk matrix while volatile polar species desorb into ambient air. Extrusion coating lines must therefore apply primers rapidly before wetting tension drops below the threshold required for solventless lamination bonds.
Converting facilities measure dyne levels using ink test pens to track this downward drift during storage periods preceding print conversion.
Decay Kinetics
Radical recombination rates within treated polyethylene webs depend strictly upon ambient storage temperatures and initial energy dosage densities delivered by the treater station. Higher ambient warehouse heat accelerates molecular chain mobility, which shortens the retention window for effective solvent based adhesive application. Film rolls left standing beyond the critical reaction window exhibit poor bond strength because oxidized species lose orientation at the interface.
Barrier Impact
Surface energy reduction degrades high speed extrusion lamination integrity by lowering peel resistance across flexible packaging structures. Converters compensate for aged polymer stock by employing inline corona re-treaters immediately before fluid deposition stations to restore reactive bonding sites. Uncontrolled polymer reversion causes delamination failures during retort pouch sterilization cycles.
