Functional cellulose diacetate tow coating system, coating process and preparation method

The invention provides a functional cellulose diacetate tow coating system, a coating process and a preparation method. The technical problems that an existing preparation method is high in cost, and a prepared tow is poor in overall effect are solved. The coating system comprises a stock solution storage unit, a stock solution conveying unit and a coating unit; the conveying unit comprises a conveying pipeline and a conveying pump arranged on the conveying pipeline; the inlet end of the conveying pipeline is connected with the stock solution storage unit, and the outlet end is provided with a first branch pipe and a second branch pipe; a first flow meter and a second flow meter are respectively arranged on the first branch pipe and the second branch pipe and are used for controlling the output quantity of the functional substance stock solution; the coating unit comprises a side plate, a first coating opening and a second coating opening, the first coating opening and the second coating opening are formed in