Quantifying Surface Energy Values on Polyolefin Packaging Materials
Polyolefin surface energy quantification relies on standardized liquid titration or goniometry to secure ink adhesion and lamination bond strength across runs.
Cross-Hatch Adhesion ASTM D3359
Coating Bond Assessment
Mechanical shear forces evaluate how well a dried film stays attached to a substrate under controlled stress. The cross-hatch adhesion astm d3359 standard prescribes a lattice pattern cut into the surface to measure the resistance of a coating to separation. Operators perform this diagnostic by slicing through the material with a hardened blade to reach the underlying base.
Grid Geometry
Specifications within the protocol dictate specific spacing for cuts based on film thickness to ensure consistent results across different materials. Fine grids apply to thin coatings while wider intervals suit thicker applications to prevent film destruction during the testing procedure. Precision requires the blade to penetrate the full depth of the layer without gouging the board or film beneath.
A pressure sensitive tape presses firmly over the cut area and the operator removes it at a sharp angle to lift any loose segments.
Classification Threshold
Quantitative scores depend on the percentage of area removed from the cut squares when the tape lifts. Examiners compare the remaining pattern against published visual charts to assign a grade from zero to five. Lower values indicate poor attachment where the coating peels away easily from the substrate during the removal phase.
High ratings signal stable bonding between the film and the carrier medium under extreme mechanical strain. Success in these tests confirms that a finish survives the stresses of converting or downstream use.