Wetting tension (e. g. for determination of Corona treatment intensity)
Suitable for plastic films and sheets (Union Carbide test) as well as for plastic coatings on paper and other substrates. The test is carried out by wetting the material surface by coloured inks with specified wetting tension for determination of the critical surface tension. Standard parameter for the assessment of surface tension after corona treatment (also called "dyn-number"). Also suitable for troubleshooting e.g. anti-sealing effect, reverse side treatment, blocking or corona perforation.
In short — AI-generated
This test determines the surface energy of plastic films and coatings by applying standardized test inks with known surface tensions to the material. By observing whether the ink film remains stable or retracts into droplets, the wetting tension of the surface is identified.
The resulting value, often referred to as the 'dyne level,' indicates the intensity of a corona treatment and the material's suitability for printing or bonding. It is a critical quality control parameter used to troubleshoot issues like poor ink adhesion, sealing failures, or unintended reverse-side treatment.
Text is AI-generated; based on test method data curated and verified by Innoform.
Standard Tests
wetting tension, standard test (pretreatment intensity)
Specific Norm: DIN ISO 8296
Test to determine the surface tension of surfaces with the squeegee method. By wetting the surfaces with test inks of defined surface tension, the surface tension of the surface is determined accurately to ± 2 mN/m (dyn/cm).
testing for pre-treatment failures (full surface, max 2 m² filmsurface, fotografic documentation incl.)
Specific Norm: DIN ISO 8296
When pretreating plastic film surfaces with corona discharge, under some conditions backside treatment, corona discharges and other errors can occur. The consequences are undesirable and occasionally locally variable surface tension deviations, e.g. punctual increases in surface tension on the normally untreated reverse side of the film. These effects caused by short circuits can lead to local blocking, sealing problems (anti-sealing effect) and even holes in the film. With this method we visualise and localise defects of the surface tension/wettability by wetting the surface with test inks of different sensitivities.
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