Fundamentals of Flame Plasma Surface Treating Troubleshooting Dryer Systems

摘要

The main objective of any surface modification or surface treatment is to improve adhesion of a coating, ink, adhesive, or another substrate layer to the base substrate which can be paper, a polymer film or aluminum. Plastics are composed of non-polar, long chain molecules, with low surface energy. They are inert molecules. Materials used regularly in extrusion coating and flexible packaging polyolefins such as polyethylene and polypropylene, and aluminum and multilayer structures using these materials. Unlike materials with high surface energies like metals and ceramics, virgin plastics do not contain the available bond sites provided by charged ions distributed over the surface. These provide for Van der Waals bonding forces. Without this molecular attraction (Van der Waals forces), liquids fail to "wet out, or adhere to the surface, resulting in poor adhesion of an ink, coating, adhesive or lamination. As long as solvent based coatings, inks, and adhesives were used in converting processes, surface modification or surface treatment was not usually required, or if it was, the level of treatment was relatively low.