“Thermal or heat activated laminating films are constructed of a layer of Biaxially oriented polypropylene base film and a layer of adhesive resin (Ethylene Vinyl Acetate (EVA) or Polyethylene or Ethylene Acrylic Acid (EAA) or a blend of all these), bonded together. During the lamination process, the adhesive resin is softened or liquefied and permanently bonded to the document. Once liquefied, the adhesive is spread across the surface and with pressure, forced into the pores of the paper. The adhesive then hardens as it cools creating a permanent bond between paper and film.”

“Pressure Sensitive laminating films are often referred to as cold films. The reason is that they require no heat or very limited amount of heat to adhere to any particular document during the laminating or mounting process. The adhesive layer in cold film is constantly in a tacky state since no heat is used in the sealing process (only pressure). This gives the need for a paper or film liner, that keeps the film from adhering to itself when it is rolled. Pressure sensitive laminating films will adhere to almost any substrate but is best used for heat sensitive or previously heat activated materials. These films work great for overlaminating and mounting on such substrates as gator board, foam board, wood, Plexiglass or delicate print materials such as photostats, transparencies, cyberchromes and thermal transfers.”

(Jaipuria of Cosmo Films, India; US Patent 7,854,987; 12/21/2010)

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