Selecting Water Based Dispersion Coatings for Standard Folding Cartons
Water based dispersion coatings replace extruded plastics on cartons by balancing polymer chemistry, coat weight, drying capacity, and fiber repulpability.
PFAS-free Barrier
Surface Energy
Chemical formulations applied to paperboard surfaces block liquid penetration and oil migration without fluorinated chemistry. Packaging manufacturers deploy a PFAS-free barrier to meet environmental compliance mandates for food contact papers. Water-based acrylic dispersions or bio-based polymers create continuous surface films that lower surface energy.
Coated paperboard resists aqueous liquids through balanced surface tension while maintaining repulpability in standard recycling streams.
Substrate Resistance
Liquid resistance mechanisms rely on mechanical film formation rather than surface fluorination. Achieving grease resistance in a PFAS-free barrier demands dense film coverage to close surface pores on paperboard stock. Pinholes in raw coating applications allow oil passage, requiring dual coating stations or specialized metering bars during board production.
Standard oil kit testing measures barrier effectiveness, where non-fluorinated formulations must prevent solvent penetration across specified exposure times. Hydrophobic additives reduce water absorption values, protecting structural stiffness during cold storage or wet contact. Substrate smoothness directly influences coating distribution, as rough base sheets demand higher coat weights to achieve uniform barrier coverage.
Coating Integrity
Converting operations subject barrier coatings to folding and creasing during box blank fabrication. Flexible resin formulations in a PFAS-free barrier prevent film cracking along score lines where oil leakage typically occurs. Crease resistance testing verifies that mechanical bending does not rupture the continuous polymer matrix.