Virgin SBS against White Lined Chipboard for Retail Facings
Virgin SBS provides superior print brightness, stiffness consistency, and crack-free scoring, whereas recycled board lowers initial cost but adds waste.
Coating Delamination
Surface Adhesion
Aqueous barrier coating delamination occurs when functional polymer layers peel away from cellulose substrates under mechanical stress or high moisture gradients. Converting lines monitor this failure mode by measuring peel strength between the paperboard and the applied dispersion during rotary die cutting. Polyethylene extrusion barriers and water based acrylic emulsions demand specific dyne levels on the base paper to prevent premature separation during folding carton fabrication.
Excessive drying temperatures inside the hot air tunnel generate internal vapor pressure that forces the mineral coating off the untreated kraft liner.
Interfacial Failure
Polymer film separation reduces grease resistance and moisture vapour barrier performance on folded food cartons. Converting plants test bond integrity using cross hatch tape adhesion protocols on conditioned packaging samples before final shipment to pharmaceutical filling lines. Thermal sealing jaws operating at elevated dwell times weaken weak hydrogen bonds at the interface if the primer coat fails to cure completely during web transit.
Paper mills prevent adhesive breakdown by controlling the coat weight and applying corona discharge treatments immediately before the liquid dispersion reaches the drying station.
Barrier Degradation
Substrate delamination compromises the integrity of corrugated boxes intended for cold chain logistics by allowing water vapour to penetrate the exposed wood fibres. Converting losses escalate when defective barrier layers delaminate during high speed carton erection because automated packaging machinery jams on loose flaps. Production supervisors reject rolls displaying low peel resistance values because subsequent gluing operations fail when the adhesive bonds to a migrating coating rather than the solid board.
Modern recycling streams reject coated packaging components when adhesive failure leaves polymer fragments contaminating the repulped cellulose slurry.