ポリエステルフィルムの製造方法、ポリエステルフィルム、積層フィルム

Japanese Patent JP7428798

B2

The present invention addresses the problem of providing: a method for producing a polyester film capable of further suppressing uneven thickness of a functional layer provided on the surface of a polyester film; and a polyester film and a laminated film capable of further suppressing uneven thickness of a functional layer provided on the surface.　The method for producing a polyester film of the present invention has an extrusion molding step for extruding a molten resin containing a polyester into a film to form an unoriented polyester film; a longitudinal orientation step for orienting the unoriented polyester film in the transport direction; a widthwise orientation step for orienting the uniaxially oriented polyester film in the width direction; a heat fixation step for heating to heat fix the biaxially oriented polyester film; a heat relaxation step for heating at a lower temperature than the heat fixation step to heat relax the heat-fixed polyester film; a cooling step for cooling the heat-relaxed polyester film; an expansion step for expanding the heat-relaxed polyester film in the width direction in the cooling step; and a particle-containing layer formation step for providing a particle-containing layer that contains particles on at least one surface of the polyester base material, the cooling velocity of the polyester film in the cooling step being 2200-3500°C/min and satisfying the following specific condition 1.

Fukuoka Yuki
Takaharu Nagao

JP2022531954A

February 06, 2024

June 21, 2021

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Fujifilm Corporation

B29C55/14; B29C48/08; B29C48/21; B29C48/305; B32B27/14; B32B27/36; C08J7/04

JP2018062120A
JP2004361446A
JP2014189002A
JP2005263853A
JP2014111357A

WO2018159424A1
WO2005110718A1

Hideaki Ito
Fumio Mihashi

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