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nature : three cellulose acetate esters made from the raw materials for the film. Will triacetate cellulose ester solution or by the dry and wet membrane obtained by heat treatment. Transparent, impermeable, there is a certain intensity. The past is the photosensitive film substrate, besides the film, photographic film and civilian, the other varieties of film polyester film has been replaced, but the packaging and decoration materials are also used.
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