Abstract: A changing method includes the steps of supplying a carbon fiber material with a surface covered by a thermosetting resin oil, performing a desizing step to remove the thermosetting resin oil from the surface of the carbon fiber material, performing a surfactant coating step to coat a surfactant onto the surface of the carbon fiber material, and performing a sizing step to cover a surface of the surfactant by a thermosetting resin oil, so as to obtain a carbon fiber material with a thermosetting resin oil coated onto the surface of the carbon fiber material.

Abstract: A changing device includes a feed component, a winder, a desizing oven, a coating component and a sizing component, and the feed component is provided for supplying a carbon fiber material, and a thermosetting resin oil is covered onto a surface of the carbon fiber material, and a desizing oven is provided for removing the thermosetting resin oil form the surface of the carbon fiber material, and then the coating component coats a surfactant onto the surface of the carbon fiber material, and finally the sizing component is used to coat a thermoplastic resin oil onto a surface of the surfactant to form a carbon fiber product to be wound onto a rewinding part of the winder, so as to produce a carbon fiber product with a thermoplastic resin oil coated onto a surface of the carbon fiber product.

Abstract: A changing device includes a feed component, a winder, a desizing oven, a coating component and a sizing component, and the feed component is provided for supplying a carbon fiber material, and a thermosetting resin oil is covered onto a surface of the carbon fiber material, and a desizing oven is provided for removing the thermosetting resin oil form the surface of the carbon fiber material, and then the coating component coats a surfactant onto the surface of the carbon fiber material, and finally the sizing component is used to coat a thermoplastic resin oil onto a surface of the surfactant to form a carbon fiber product to be wound onto a rewinding part of the winder, so as to produce a carbon fiber product with a thermoplastic resin oil coated onto a surface of the carbon fiber product.

Abstract: A changing method includes the steps of supplying a carbon fiber material with a surface covered by a thermosetting resin oil, performing a desizing step to remove the thermosetting resin oil from the surface of the carbon fiber material, performing a surfactant coating step to coat a surfactant onto the surface of the carbon fiber material, and performing a sizing step to cover a surface of the surfactant by a thermosetting resin oil, so as to obtain a carbon fiber material with a thermosetting resin oil coated onto the surface of the carbon fiber material.

Abstract: A manufacturing device includes a material supply module, a winding machine as well as a low-temperature furnace, a tension wheel set, a microwave graphitization module and a gluing module sequentially installed between the material supply module and the winding machine, so that a carbon fiber raw material can be manufactured continuously in mass production to enhance the graphitization efficiency and lower the process cost significantly.

Abstract: A high modulus graphite fiber with a tensile modulus of 270˜650 GPa and a plurality of crystal structures with a thickness (Lc) of 20˜70 angstroms is disclosed. Carbon fiber is used as a raw material, and a microwave focusing method is used to perform an ultra quick high temperature graphitization process to increase the temperature of the carbon fiber at a heating speed of 10˜100° C. per minute to a graphitization temperature of 1400˜3000° C., and then to perform a quick graphitization process for 0.5˜10 minutes to form the high modulus graphite fiber.