Contact Angle Goniometry Protocols for Polyolefin Lamination Adhesion Verification
Sessile contact angle goniometry isolates polar and dispersive surface energy to verify polyolefin corona treatment and prevent lamination delamination.
ISO 19403
Measurement Standard
Technical specifications for evaluating the surface tension of liquids and the surface free energy of solids provide a framework for testing wettability and adhesion. The iso 19403 series defines the methods for using contact angle measurements to determine the polar and dispersive components of a surface. It applies specifically to coatings and varnishes used in their application.
By following these protocols, laboratories can produce comparable data across different materials and testing environments. Comparability is essential.
Testing Protocol
Detailed procedures within the standard outline the use of specific test liquids and the calculation models required to interpret the results. Part two of iso 19403 describes how to measure the contact angle of droplets on a surface to calculate its energy. It requires the use of at least two liquids, one polar and one dispersive, to fully characterize the surface.
This approach provides a more accurate picture than single liquid tests because it accounts for the different types of molecular interactions at the interface.
Process Relevance
Industrial applications of the standard ensure that surface treatments and ink formulations are optimized for high speed production. Using the metrics defined in iso 19403, engineers can verify that a polymer film has been treated sufficiently to accept a water based coating. It also helps in troubleshooting adhesion failures by identifying whether the problem lies with the surface energy of the substrate or the surface tension of the ink.
The standard supports the development of more sustainable packaging by enabling the use of aqueous coatings on traditionally difficult surfaces. Accurate data from these tests also allow for the precise calibration of corona or plasma treatment equipment.