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Surface energy measurement – inks and pens by Arcotest GmbH

The surface energy is one decisive criterion for the adhesion of printing ink, glue, varnish, etc. on many plastic and metal surfaces. It is given in mN/m. Apart from some exceptions the general rule is: The higher the surface energy of a material the better the adhesion of anything meant to be fixed to its surface. As a general limit 38 mN/m is often mentioned for good adhesion on the surface.

Test inks and test pens by ARCOTEST GmbH are used for the determination of the surface energy value. This serves well to find out about the quality of a treatment process. This testing method is suitable for the operating personnel on any production line as a routine check, when the result can be immediately evaluated and gives a very clear picture of the degree of treatment. The accuracy of the measurement is ±1 mN/m.

Practical example of surface energy measurement using inks you can see on video sequence Surface energy of sintered surfaces.

Contact angle measurement and surface energy calculation – See Scan

See Scan (on the picture) is used to determine contact angle between defined liquid and solid phase. Equipment includes special software, which is able to calculate surface energy of solids by means of mathematical models. Scanning is realized by digital video camera and is transferred into PC, where the scanned contact angle is analyzed and processed.

Material PTFE

Contact angle before modification 150°

Material PTFE

Contact angle after modification 20°

Material: PBT

Contact angle before modification 85°

Material: PBT

Contact angle after modification 40°

Material: TPU

Contact angle before modification 92°

Materiál: TPU

Contact angle after modification 40°