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AssigneeKaneka Corporation
InventorsYusuke Ohta, Takashi Inada, Makoto Mishiro, Takashi Inada, Yasushi Nishikawa
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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.
A product consisting of a single layer graphite film, the single layer graphite film having a width Ugs and a sagging Zgs determined by using a sagging evaluation described in JIS C2151, wherein the ratio Zgs/Ugs is a value of 0.2 or less, wherein the graphite film has a width Ugs of 100 mm or more, a thickness of from 7 μm to 120 μm, and a length of 1 m or more.
A product consisting of a single layer graphite film, the single layer graphite film made by the process of subjecting a raw material consisting of a graphite single layer film to heat treatment at a temperature of 2000° C. or higher while a pressure is applied to the raw material graphite film, wherein the resulting single layer graphite film has a width Ugs and a sagging Zgs determined by using a sagging evaluation described in JIS C2151, wherein the ratio Zgs/Ugs is a value of 0.2 or less, and wherein the graphite film has a width Ugs of 100 mm or more, a thickness of from 7 μm to 120 μm and a length of 1 m or more.
Dependencies are inferred from the claim text.