Hot laminating film consists of two layers, a polyester-base layer and an inner adhesive resin layer. The material to be laminated is placed between two sheets of laminating film. Heated rollers melt the adhesive resin layer, which then spreads over the document, hardening as it cools and creating a bond between the material and film.
Why use hot (heat activated) films?
Heat activated films form a better and more permanent bond to suitable material surfaces and are generally less expensive than pressure-sensitive films.