Method for regenerating carbon fiber bundle and apparatus for regenerating carbon fiber bundle

A method for regenerating a carbon fiber bundle from a structure having a hollow substrate, and a carbon fiber reinforced resin layer including a carbon fiber bundle that is wound around the hollow substrate, and a matrix resin, the method comprising:

• a first heating process of heating the structure to decompose a part of the matrix resin;
• an unwinding process of unwinding an intermediate carbon fiber bundle to which decomposition residue of the matrix resin is adhering from the carbon fiber reinforced resin layer in which a part of the matrix resin is decomposed;
• a second heating process of heating the unwound intermediate carbon fiber bundle to decompose the decomposition residue of the matrix resin by using a tube furnace, and thereby obtaining a regenerated carbon fiber bundle;
• and
• a winding process of winding the regenerated carbon fiber bundle, wherein
• the tube furnace has a heater that heats the intermediate carbon fiber bundle, and a lid that is installed at each of an inlet and an outlet, and has at least one through-hole through which the intermediate carbon fiber bundle can pass through formed in the lid.