Double screw cutter for recycled carbon fiber material and method of cutting recycled carbon fiber material by using the same

A method of cutting recycled carbon fiber material by using a double screw cutter, comprising the steps of:

• establishing a double screw cutter comprising a housing defining a cut channel extending within and along said housing, counter-rotating twin screws disposed in said cut channel within said housing, said counter-rotating twin screws being configured with two screw rods, each screw rod having a first end and a second end disposed opposite to said first end, wherein two axial lines of said two screw rods of the counter-rotating twin screws are inclined toward each other in a direction from said first end to said second end of each of the two screw rods, wherein said first end corresponds to a discharge outlet formed in said housing, and wherein each of the two screw rods is tapered in the direction from the first end to the second end;
• dividing carbon fiber into long fiber with a length of 200 mm-300 mm, mid fiber with a length of 100 mm-200 mm, and short fiber with a length of 15 mm-100 mm;
• feeding the long fiber, the mid fiber, and the short fiber of the carbon fiber into said cut channel respectively through a long-fiber feed inlet located at a housing in a communication with the cut channel, a mid-fiber feed inlet located at the housing in communication with the cut channel, and a short-fiber feed inlet located at the housing in communication with the cut channel;
• driving said two screw rods of said counter-rotating twin screws to rotate in opposite directions simultaneously and adjusting a rotation speed of the two screw rods according to a length of the carbon fiber to be recycled;
• and
• cutting the long fiber, the mid fiber, and the short fiber of the carbon fiber input into the cut channel by the two screw rods rotating in opposite directions simultaneously, and sending the carbon fiber toward a discharge outlet disposed on a rear end of the housing in communication with the cut channel along with rotation of the two screw rods for outputting the carbon fiber cut into a preset length through the discharge outlet.