Corona Decay Kinetics and Solventless Adhesive Wetting in Polypropylene Lamination
Corona decay on polypropylene impairs solventless adhesive wetting, requiring in-line treatment to maintain dynamic surface energy above 40 dyn/cm.
ISO 8296 Surface Tension
Measurement Protocol
Scientific procedures for determining the wetting tension of polyethylene and polypropylene films provide a way to predict liquid adhesion. The application of iso 8296 surface tension testing involves brushing solutions of known surface energy onto the plastic surface. An observer monitors the behavior of the fluid to see if it remains as a continuous film or breaks into droplets.
Adhesion Prediction
Printing inks and coatings require a specific energy level to bond permanently with a non-porous substrate. Practitioners use iso 8296 surface tension data to decide if a film requires corona treatment or if the existing treatment has decayed over time. High surface energy generally correlates with better ink spread and stronger mechanical bonding of the dried layer.
This measurement is conducted in a controlled environment to prevent contamination from dust or oils. Testing reveals if the substrate is ready for high speed multi color printing.
Liquid Application
Monitoring the behavior of specialized solutions at the point of converting ensures that laminations do not delaminate and labels do not peel. Dyne pen testing offers a rapid check for operators on the factory floor. This method establishes a baseline for surface readiness before expensive coatings are applied.