Films

Films are produced by an imagesetter from the artwork. They are used to produce the printing plates by a photochemical process. There is one separated film for each ink used. See Four Colour Process Printing.
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Films

Acetate, polyester, polyethylene vinyls and other polymeric. Face material manufacturing from synthetic high molecular weight polymers.
Found on http://www.encyclo.co.uk/local/20829
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