Method for improving the flatness of graphite film, graphite film, and method for producing same

摘要

When a raw material graphite film bad in flatness is laminated onto another material, creases and other defects may be caused. In particular, when a graphite film having a large area is laminated, defects such as creases may be often caused. In order to solve such defects, a flatness correction treatment step is performed wherein a raw material graphite film is subjected to heat treatment up to 2000° C. or higher while a pressure is applied thereto. This flatness correction treatment gives a graphite film good in flatness. Furthermore, when the flatness of the raw material graphite film is corrected by use of a thermal expansion of a core, a graphite film small in sagging can be obtained.

主权项

1. A method for producing a single layer graphite film, comprising a flatness correction treatment step of subjecting a raw material graphite film consisting of a graphite single layer to heat treatment at a temperature of 2000 C or higher while a pressure is applied to the raw material graphite film.