Polymeric Paperboard Barrier Coating Test Methods and Compliance Documentation
Verify polymer barrier paperboard through creased Cobb testing, migration simulant suites, Cepi repulpability yields, and lot-matched Declarations of Compliance.
Acrylic Dispersion
Binder Chemistry
Synthetic polymer particles suspended in a liquid medium provide the structural foundation for specialized coatings on paperboard. This acrylic dispersion typically consists of acrylate or methacrylate monomers polymerized within an emulsion to create a stable fluid. The material forms a continuous film upon drying, which binds pigments to the substrate and provides a glossy finish.
Barrier Performance
Resistance to moisture and oil depends on the specific chemical composition of the dry film. When an acrylic dispersion is applied to a packaging surface, the coalescing particles create a hydrophobic layer that prevents the penetration of liquids into the cellulose fibres. Stability against ultraviolet light ensures that the coating does not yellow or become brittle over time.
This property remains effective across a wide temperature range, making it suitable for refrigerated food containers.
Converting Compatibility
Efficient application during the converting process requires precise control over viscosity and solids content. Because the acrylic dispersion is water-based, it allows for easier cleaning of coating stations and lower volatile organic compound emissions compared to solvent-based alternatives. Heat sealing properties vary based on the glass transition temperature of the specific polymer used in the formulation.
High-speed flexographic or gravure equipment can apply these coatings at thicknesses measured in microns. Careful monitoring of the drying oven temperature prevents the formation of pinholes or surface defects that would compromise the barrier.