APPARATUS FOR MANUFACTURING POLYMER MIXED SOLUTION, METHOD OF MANUFACTURING ACRYLONITRILE BASED POLYMER MIXED SOLUTION USING THE APPARATUS, METHOD OF MANUFACTURING ACRYLONITRILE BASED POLYMER SOLUTION, AND METHOD OF MANUFACTURING CARBON FIBER PRECURSOR ACRYLONITRILE BASED FIBER

PROBLEM TO BE SOLVED: To provide a polymer mixed solution excellent in terms of cost while preventing a defective mixture from occurring.SOLUTION: An apparatus for manufacturing the polymer mixed solution comprises a polymer mixing container and a rotary rotor 2 in the container and satisfies the following items. 1. There is provided the rotary rotor having a truncated cone shape, in which a lower surface circle is larger than an upper surface circle, and capable of rotating. 2. There is provided a polymer introducing opening 1 capable of providing the polymer to the upper surface of the rotary rotor 2. 3. There is provided a solvent introducing opening 3 on the side surface of the mixing container. 4. There is provided a mixing chamber 4, which is a space between the outside surface of the rotary rotor and the inside surface of the mixing container and has 5-50 mm gap of the space. 5. There are provided pins 6, 7 in the outside surface of the rotary rotor and the inside surface of the mixing container. 6. There is provided a scraping blade, for sending the mixed solution to a deriving opening, in the bottom part on the outside of the rotary rotor. 7. There is provided a deriving opening, for discharging the mixed solution, in the bottom part on the side of the mixing container side.