Pattern Varnish: Spot varnish applied to the printed surface in a desired pattern.
Peel: Force required to pull a label from a surface.
Permanent Adhesive: An adhesive characterized by having relatively high ultimate adhesion to a wide variety of surfaces.
Polyester: A strong film having good resistance to moisture, solvents, oils, etc. Usually transparent, although available with opaque and metalized finish. A clear complex ester formed by polymerization or condensation. Excellent strength, clarity and dimensionally stable.
Polyester Liner: A polyester film that is silicone release coated. It provides an excellent die-cutting surface and is also used on over laminating films to provide a smooth, glass-like surface of adhesive.
Polyester Metalized Film: A clear polyester film, vacuum metalized on one side to provide a metallic look.
Polyethylene: A tough, stretch plastic film having very good low temperature characteristics. Also used a great deal for producing semi-rigid recyclable bottles.
Polypropylene: (PP) Similar to polyethylene but stronger and having a higher temperature resistance. Various thermoplastic plastics are polymers of propylene; excellent clarity. They are also used in various thicknesses in the printing of labels as well as backing or liner materials.
Post Cure: The continuation of polymerization (curing) process within a UV ink or coating, after exposure to UV radiation has been terminated.
Pressure Sensitive Label Stock: The combination of face material pressure sensitive adhesive and release liner from which pressure sensitive labels are manufactured.
Primary Label: Label that acts as the main identification of a product. Often designed to attract attention and contains information to appeal to a buyer and is usually applied at the time of its manufacture.
Prime Label: A label used to identify and display a product, i.e., a major product panel.
Printability: The ability of a material to accept and hold a printed legend and especially to resist offset of the printing when rewound into a roll after printing. Also, a collective term used to describe the properties required of all components in the printing process.
Process Printing: Printing from a series of two or more halftone plates to produce intermediate colors and shades. In 4-color process, the colors are yellow, magenta, cyan and black.
Protective Coating: A coating that protects the printing and the surface of a pressure sensitive label from either abrasion, sunlight, chemicals (their fumes and dilute solutions) and moisture or a combination of these.