Low Humidity Impact on Dispersion Barrier Coating Fold Integrity
Low relative humidity embrittles paperboard and dispersion coatings, causing fold micro-cracks that degrade barrier integrity unless creasing geometry adapts.
Kit Grease Resistance
Surface Property
The ability of a paper or board surface to repel the penetration of nonpolar liquids is measured by applying a series of oil and solvent mixtures of increasing aggressive power. Determination of kit grease resistance follows a standard test where twelve different solutions are dropped onto the substrate. The result provides a numerical score from one to twelve based on whether the liquid darkens the paper.
Testing Procedure
Laboratory technicians apply the reagent for fifteen seconds before wiping it away and inspecting the surface for failure. A high kit grease resistance value indicates that the coating can withstand the fatty acids and oils found in fast food or industrial components. The test is commonly used for fluorochemically treated papers or those with aqueous barrier coatings.
It records the immediate rejection of the liquid by the surface energy of the sheet.
Application Standard
Requirements vary depending on the end use of the material, with pet food bags typically needing a higher score than a bakery liner. When kit grease resistance is too low, oils leach through the package and create unsightly stains on the outer print. This failure compromises the branding and the structural integrity of the paper.