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.
Deadfold Retention
Fold Memory
Mechanical resistance describes the tendency of a paper substrate to maintain a physical crease once force is applied by an automated packaging line or manual folding apparatus. Deadfold retention determines how effectively a sheet holds this shape without exerting springback force against adhesive seals or tensioned wrappers. High performance in this property allows converters to produce sharp, clean edges on intricate boxes or foil laminated wraps.
Structural Mechanics
Fiber orientation and internal sizing levels define the inherent capacity of a substrate to lock into a bent state. Manufacturers adjust the refining levels of cellulose pulp to increase the plasticity of the finished web. Increased refining disrupts fiber-to-fiber bonding enough to allow the material to deform permanently under pressure without fracturing the surface coating.
A soft, ductile structure minimizes internal stress during the forming process.
Production Performance
Precision during the folding cycle depends upon the ability of the material to resist the internal recovery force of the compressed cellulose fibers. Machines running at high speed require specific tolerances because springback interferes with the application of glue or heat seals. Substrates that fail to remain in the desired position cause misaligned seams that reduce the integrity of the protective barrier.
Consistent material behavior ensures that every unit maintains its final form throughout the distribution cycle.