What are dyne levels? A dyne level is the measurement of surface energy. Surface tension is measured in energy units called “dynes/cm”. The ability of a substrate, coating, ink, or adhesive to adhere is directly related to its surface energy. So how does one evaluate the dyne level? A dyne test consists of of applying wetting tension liquids across a substrate to analyze print-ability, coating lay down, and heat sealability of treated films. A technician can choose from three methods to measure a dyne;
a dyne pen, draw-down, or swab applicator. The most common method of testing is with the dyne pen. If surface tension of the dyne liquid is higher than the surface energy of the substrate, the liquid will begin to form small water particles. To achieve good ink anchorage, adhesion, and wetting the surface tension needs to exceed the surface tension of the liquid. If this has been achieved the liquid will spread uniformly across the surface. Often times to increase the dyne level of a substrate adhesive coaters will corona treat the substrate. Corona treating exposes the substrate to an electrical discharge which oxidizes the films surface.