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nature : the photographic support, and is a transparent, flexible features and certain mechanical strength plastic film, which features the film constitutes the main mechanical properties. Cellulose nitrate was used to make films, and the biggest drawback is flammable. Later switch to three cellulose acetate film base for the film-called security. 20 1960s polyester film base also emerged, it has a higher intensity and a small deformation. At present, apart from the film and civilian film still use three basic acetate fiber-based, such as X-ray film, print film, remote sensing film and microfiche all use of polyester film base. In addition, tape-based industrial belt also use the polyester-based band.
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