Method for producing polyester film, polyester film, and laminated film

The present invention addresses the problem of providing: a method for producing a polyester film capable of further suppressing thickness unevenness of a functional layer provided on the surface of the polyester film; a polyester film capable of further suppressing thickness unevenness of a functio...

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Bibliographische Detailangaben
Hauptverfasser:	NAGAO TAKAHARU, FUKUOKA YUKI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention addresses the problem of providing: a method for producing a polyester film capable of further suppressing thickness unevenness of a functional layer provided on the surface of the polyester film; a polyester film capable of further suppressing thickness unevenness of a functional layer provided on the surface; and a laminated film. This method for producing a polyester film comprises: an extrusion molding step for forming an unstretched polyester film by extruding a molten resin containing a polyester in the form of a film; a vertical stretching step for stretching the unstretched polyester film in the transport direction; a transverse stretching step for stretching the uniaxially oriented polyester film in the width direction; a heat-setting step for heat-setting the biaxially oriented polyester film by heating the biaxially oriented polyester film; a thermal relaxation step for thermally relaxing the heat-set polyester film by heating the polyester film at a temperature lower than tha