Mechanical Greaseproof Paper Grade Selection for Bakeries and Fast Food Packaging
Optimize mechanical greaseproof paper selection by specifying 80-88 SR refining and 15000+ s Gurley porosity to secure non-PFAS grease resistance.
Non-Fluorinated Grease Barrier
Surface Coating
Paper stocks utilize cellulose-based layers to stop fats and oils from migrating through the substrate. A non-fluorinated grease barrier works by closing the porous structure of a sheet to inhibit the capillary action that draws lipids into the fibre network. Manufacturers apply these formulations as an aqueous dispersion or a film lamination during the wet-end or sizing stages of production.
Testing labs confirm performance through the kit test or oil absorption methods to quantify resistance levels. This mechanism allows a package to maintain structural integrity while keeping the exterior surface clean for consumer handling.
Performance Measurement
Moisture sensitivity and thermal stability dictate the durability of the barrier against high-temperature food products. A non-fluorinated grease barrier performs under contact with hot fats for short durations but loses efficacy if prolonged saturation causes structural swelling. Laboratory analysts compare these results against standardized temperature gradients to predict shelf life.
Variations in base sheet density require adjustments to the application weight to reach target resistance thresholds. Uniform coverage prevents weak points where oil could penetrate through pinholes in the coating.
Converting Requirement
Printers and converters demand precise drying cycles to ensure the chemistry sets without damaging the underlying cellulose structure. The non-fluorinated grease barrier creates a specific surface tension that dictates how traditional inks and adhesives bond to the treated side of the sheet. Machines running these materials must calibrate nip pressure carefully to avoid cracking the coating during the folding or creasing process.
Excessive force creates micro-fractures that undermine the protective capacity of the finished container. Reliable grease resistance depends upon the continuous application of the substance across the entire surface area.