Method for producing polyester film, and polyester film

The present invention addresses the problem of providing a method for producing a polyester film capable of more suppressing the formation of linear defects on the surface of the polyester film. The present invention also addresses the problem of providing a polyester film. This method for producing...

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Bibliographische Detailangaben
Hauptverfasser:	FUKUOKA YUKI, NAGAO, TAKAHARU, NAKAMURA KAZUHARU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The present invention addresses the problem of providing a method for producing a polyester film capable of more suppressing the formation of linear defects on the surface of the polyester film. The present invention also addresses the problem of providing a polyester film. This method for producing a polyester film has a cooling step in which a uniaxially stretched polyester film is brought into contact with a cooling roll and cooled, and the arithmetic average roughness Ra of the surface of the cooling roll is 0.05 [mu] m or less. 本发明的课题在于提供一种能够更抑制聚酯膜的表面上的线状缺陷的形成的聚酯膜的制造方法。并且，本发明的课题在于提供一种聚酯膜。本发明的聚酯膜的制造方法具有使经单轴拉伸的聚酯膜与冷却辊接触而进行冷却的冷却工序，冷却辊的表面的算术平均粗糙度Ra为0.05μm以下。