Polymers such as plastisol, latex, neoprene, polyurethane and epoxy are the most commonly used materials for coating. The process of coating is complex and requires precise engineering and quality control. It is important to consider the effects of paint chemistry and compatibility with plastics, as well as surface quality, in order to achieve optimal product performance. Monocomponent lacquer, two-component thermosetting and UV coating technologies are effective for painting and coating plastic materials, and are available in water-based chemicals. In order to create a usable barrier against oxygen and moisture, a layer of metallized aluminum and transparent oxide is often applied to plastic films.
This is an environmentally friendly alternative to aluminum foil. UV cure coatings generally require direct exposure to a UV cure lamp to achieve film hardness; however, water-based UV cure coatings are unique in that they form a film that is dry to the touch even before curing, so that small areas of shade on complex parts do not cause the presence of sticky, uncured residues in finished products. These plastic films are expected to continue to grow at a high rate due to their use in stand-up bags, meat container lids, dry food containers, microwaveable containers and other applications. Immersion-molded plastic products include latex gloves, fashion accessories and costumes, glasses, plastic closures and pieces of recreational equipment.