Hydrating kraft pulp to 78-84 degrees Schopper-Riegler via low specific edge load refining eliminates paper porosity to achieve grease resistance without chemical additives.
Fluorine-free lipid barriers rely on high polymer crosslinking and pore-free film formation to maintain diffusion resistance above lipid melting points.
Aqueous barrier coatings on food contact paperboard require accredited migration, extraction, and permeation testing matching real food simulants and shelf temperatures.
Polymer film pinholing across creased recycled stock stems from hornified fiber end punctures under high dynamic strain rates during package converting.
High frequency ultrasonic attenuation profiling non-destructively maps internal ply delamination and polymer barrier continuity during cartonboard creasing passes.
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