| http://www.w3.org/ns/prov#value | - One presently practiced method for forming films and sheeting includes broadly (1) formation of a solution of a plastic film-forming material together with such additives as plasticizers, dyes or other coloring material in a suitable solvent; (2) flowing of the solution of dope onto a casting surface such as a rotating wheel or an endless belt supported in a generally horizontal plane by at least
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