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.
Dynamic creasing impact compresses internal pore air into transient pressure spikes, reducing effective shear strength and causing high-speed ply blowout.
Optimize mechanical greaseproof paper selection by specifying 80-88 SR refining and 15000+ s Gurley porosity to secure non-PFAS grease resistance.
Furnish substitutions at the machine gate require wet end NIR tracking and ISO 1924 tensile verification to prevent runnability failures and yield losses
High-density refining and fluorine-free dispersion coatings block lipid migration and moisture breakdown where unrefined kraft papers fail under aggressive fills.
Changing stock grades alters micro-porosity and light scattering, shifting ink holdout and dot gain, requiring immediate press curve and ink film adjustments.
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