Window Film manufacturing is considered a “converting” process because the manufacturer is converting several existing products into a new product form. For example, many polyester films (the basic substrate for all window films) that are used in Window Film Manufacturing are pre-treated to accept adhesive or scratch resistant coatings. This pre-treatement may occur prior to delivery to the window film manufacturer or may occur during the Window Film Manufacturing process. These raw materials normally consist of clear, dyed or metalized films as well as silicone coated polyester release-liners, dry or solvent based pressure sensitive acrylic mounting adhesives and ultraviolet cured scratch resistant coatings. Using a variety of manufacturing processes, the window film manufacturers “convert” these raw materials into a finished product.
All Window Film starts with a basic laminating substrate known as polyester film. Developed in the early 1950’s, by 3M, polyester film serves as a backbone of the window film industry. Polyester film is durable, tough and highly flexible. It absorbs little moisture and has both high and low temperature resistances. Polyester film offers crystal clarity and can be pre-treated to accept different types of coating such as adhesives Polyester Film can also be metalized and easily laminated to other layers of polyester film. It can be dyed, or metalized by either vacuum coating, sputtering or reactive deposition to produce an array of colored and specially selective films.
Safety Film usually features one or more layers of polyester film laminated together to form a tougher, more durable product ranging from 4 mil to 15 mil and thicker product versus the standard type of solar control film that is usually 1 Mil to 1.5 Mil in thickness.
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