TAPPI T 559

Surface Retention

Greased substrate testing relies heavily upon TAPPI T 559 to quantify the repellency of paper and paperboard packaging against oleochemical penetration. Laboratory technicians apply specific liquid reagents onto the specimen surface under controlled temperature and relative humidity conditions for a predetermined duration. Visual examination reveals the percentage of stained area, providing numerical scores from zero to twelve that dictate grease resistance ratings for food contact applications.

Performance Threshold

Corrugated converters and mill operators monitor these grease resistance numbers to prevent premature oil migration through folding cartons and bakery trays. Low ratings signal inadequate internal sizing or barrier coating defects, leading directly to oil seepage and unappealing packaging stains during retail shelf storage. Higher numerical scores demand optimized fluorochemical application rates or dense bio based polymer extrusions, balancing barrier efficacy against material costs.

Cellulose Interaction

Hydrocarbon fluids travel through inter fiber voids and capillary networks within the paper matrix when barrier treatments fail to seal the porous structure completely. Refining degree, wet end chemistry, and calendering pressure alter porosity, changing how test fluids spread across the finished sheet. Manufacturing adjustments must therefore reconcile machine speed targets with the stringent grease barrier demands specified by end use standards.

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Repulpability Certification Aqueous Dispersion Non-Fluorinated Barrier

Pinhole Permeability Testing and Score Crease Barrier Integrity in Non-Fluorinated Bakery Wraps

Non-fluorinated bakery wraps maintain grease barrier integrity when dispersion elasticity exceeds score tensile strain to stop pinhole leakage.

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Line Speed Schopper-Riegler Freeness Sheet Density

Bleached Kraft Pulp Refining Freeness Control for Mechanical Greaseproof Paper Manufacture

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.

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Acrylic Dispersion Specific Migration Limit Iso 16532

Polymeric Paperboard Barrier Coating Test Methods and Compliance Documentation

Verify polymer barrier paperboard through creased Cobb testing, migration simulant suites, Cepi repulpability yields, and lot-matched Declarations of Compliance.

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EN 13430 Cold Foil Surface Energy

How Paper Is Coated Calendered and Finished

Inline blade coating and soft-nip calendering establish surface uniformity, while targeted finishing passes balance visual embellishment against repulpability.

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ASTM F119 Coat Weight Pinhole Density

Quantitative Permeation Modeling of Fluorine Free Barrier Substrates under High Temperature Lipid Exposure

Fluorine-free lipid barriers rely on high polymer crosslinking and pore-free film formation to maintain diffusion resistance above lipid melting points.

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Aqueous Dispersion Coating Z-Direction Tensile Eco-Modulation Tariffs

Polymer Film Pinholing Mechanics across Creased Recycled Fiber Furnishes under Dynamic Converting Stresses

Polymer film pinholing across creased recycled stock stems from hornified fiber end punctures under high dynamic strain rates during package converting.

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Shear-Thinning Index Capillary Rheometer Aqueous Latex Dispersions

Flexographic Coating Rheology Controls for High Elongation Barrier Paperboard Converting

Maintaining high-shear flexographic barrier coating viscosity between 25 and 40 mPa.s prevents pinholing and preserves 300 percent elongation over creased board.

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Softwood Kraft ISO 536 Strain at Break

Dispersion Barrier Coating Mechanics under Crease Stresses in Flexo Converting

Flexographic dispersion barrier coatings retain water and grease resistance under crease stresses only when coating elongation capacity matches board strain.

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