▎ 摘　　要

NOVELTY - 650 mm wide artificial graphite high conductivity film comprises artificial graphite film on the center layer and polyethylene terephthalate release film on both sides of the artificial graphite film. USE - The 650 mm wide artificial graphite high conductivity film is useful for heat dissipation of large-screen displays ADVANTAGE - The method uses multiple overlapping preparation methods to overcome the bottleneck of existing device production capacity preparation to obtain 650 mm artificial graphite high-conductivity film product, and by introducing metal components, the interlayer thermal conductivity defects are effectively overcome, overcomes the existing calendering drawbacks, and greatly expands the preparation specifications of the artificial graphite high-conductivity film. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for preparing 650 mm wide artificial graphite high conductivity film, comprising cutting many pieces of polyimide film with a width of at least 400 mm, and partially overlapping, adding metal iron particles and nickel wires into the overlapping parts, and performing rolling after overlapping to prepare a polyimide overlapping layer with a width of 700-800 mm, placing the polyimide overlapping layer under vacuum conditions, where the initial temperature is 500-650℃, allowing to stand for 0.5-0.65 hours, and heating to 1200℃ at a rate of 1.5-2.5℃/minute and completing initial carbonization by using iron particles, heating rapidly at 3-4 times the original heating rate until the temperature reaches 1500-1600℃ to complete carbonization, after the carbonization is completed, spraying organic solvent on the surface of the carbonized polyimide film, dispersing interior of the organic solvent with carbonized graphene oxide powder, after the spraying is completed, pressing surface under the pressure of 0.2-0.3 Mpa, after the pressing is completed, completing graphitization treatment at 2600℃ to prepare an artificial graphite film, and pasting both the upper and lower surfaces of the artificial graphite film with polyethylene terephthalate release film.