These same treatment techniques have been found to increase the wetting tension of a plastic film surface in contact with mixtures of solvents. It is therefore possible to relate the wetting tension of a plastic film surface to its ability to accept and retain inks, coatings, adhesives, etc. The measured wetting tension of a specific film surface can only be related to acceptable ink, coating, or adhesive retention through experience. Wetting tension, in itself, is not a completely acceptable measure of ink. It is therefore important that the portion of the film surface to be tested is not touched or rubbed, that all equipment be scrupulously clean, and that reagent purity be carefully controlled.
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Dyne Pens to ISO 8296
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