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.
Fast Food Sandwich Wrap
Grease Barrier
Cellulose substrates receive functional barrier coatings during off-machine extrusion or aqueous application to prevent lipid migration from high-fat sandwich ingredients. Fast food sandwich wrap requires a specific grease resistance rating measured by the kit test procedure, where turpentine and castor oil mixtures determine penetration thresholds on coated paper grades. Untreated kraft or glassine fails when surface energy permits droplet wetting, so specialized wax emulsions or fluorochemical treatments establish surface tension boundaries that stop oil transfer up to kit level twelve.
Conversion Tolerances
Slitting rotary dies and modern web-fed flexographic presses demand precise caliper control and uniform moisture profiles to process lightweight packaging papers without web breaks or creasing defects. A fast food sandwich wrap relies on tight substance control within plus or minus two grams per square meter to ensure consistent yield during high-speed packaging operations at franchise distribution centers. Rewinding tension must balance residual curl against blocking tendencies, because tight wound rolls stored in warm environments cause coated layers to adhere prematurely.
Fiber Composition
Virgin bleached chemical pulp provides the tensile strength necessary for manual folding and folding endurance around hot greasy fillings without tearing along crease lines. Fast food sandwich wrap utilizes short-wood hardwood fibers blended with long-wood softwood fractions to optimize formation and porosity parameters during wet end paper machine runs. Reclaimed post-consumer fibers remain restricted from direct food contact grades due to potential contaminant migration, so furnish selection depends exclusively on primary wood pulp complying with food safety regulations for direct contact packaging materials.