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Surface energy

Surface energy

The surface energy determines how much energy is needed to break the chemical bonds when a new surface of a solid or liquid is created. It is used to describe wettability. This is particularly important when materials such as plastic are to be bonded, painted or printed. If a surface is highly energetic (polar), the adhesion of printing inks or adhesives to it is considerably higher than with low-energy (non-polar) surfaces. For liquids, it is equal to the surface tension.

Fig. 1: Untreated PPS components cannot be wetted with 40 mN/m test ink

After plasma treatment, the component is completely wetted with a test ink of 60 mN/m due to high surface energy.

Fig. 2: After plasma treatment, the component is completely wetted with a test ink of 60 mN/m.

 

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