Patent ID: 9266736
Filing Date: 2016-02-23
CPC Classification: C01B,C04B,Y10T

Claim Text:
1. A method for producing a graphite film, the method comprising providing a heat-treated film that is a polymer film that has been subjected to a heat treatment, graphitizing the heat-treated film to give the graphite film, wherein the graphitizing comprises substeps (i) and (ii): (i) subjecting the heat-treated film to a first graphitizing heat treatment at a temperature of not less than 2,000° C. while the heat-treated film is in a state of being wrapped around an internal core, wherein the heat-treated film is loosened by the first graphitizing heat treatment, and (ii) winding up the heat-treated, loosened film during the first graphitizing heat treatment, after the first graphitizing heat treatment and prior to a subsequent graphitizing heat treatment, or during a subsequent graphitizing heat treatment.