Apparatus for producing pitch-based chopped carbon fiber and producing method of the chopped fiber

Abstract

The present invention relates to an apparatus for producing a pitch-based chopped carbon fiber and a producing method for the chopped fiber and, more specifically, to an apparatus and a method for drawing an ejected pitch using melt spinning and producing carbon fibers as chopped fibers in a continuous manner.

What is claimed is: 
     
         1 . An apparatus for producing a pitch-based chopped carbon fiber comprising:
 a pitch fiber spinning unit including a pitch injecting unit for injecting a molten pitch into a spinning nozzle and at least one spinning nozzle for ejecting the injected molten pitch as a fiber;   at least one rotation roll unit which is located under the pitch fiber spinning unit, wherein the pitch fiber, which is ejected from the pitch fiber spinning unit, is wound on the rotation roll unit;   at least one cutting unit for cutting the pitch fiber wound on the rotation roll unit; and   a conveying unit which transfers the pitch-based chopped carbon fiber, which is formed by being cut by the cutting unit, in one direction.   
     
     
         2 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 1 , characterized in that:
 the pitch fiber is spun as a plurality of fibers from the at least one spinning nozzle.   
     
     
         3 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 1 , characterized in further comprising:
 a collecting unit which is located between the pitch fiber spinning unit and the rotation roll unit and collects the pitch fiber spun as a plurality of fibers.   
     
     
         4 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 1 , characterized in that:
 the rotation roll unit is located to move left and right in a parallel direction thereof, and a position where the pitch fiber is wound on the rotation roll unit is moved left or right by the movement of the rotation roll unit.   
     
     
         5 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 4 , characterized in that:
 the rotation roll unit is located under the pitch fiber spinning unit and includes a first rotation roll unit on which the pitch fiber ejected from the pitch fiber spinning unit is wound, and a second rotation roll unit which draws the pitch fiber which passed through the first rotation roll unit,   wherein the first rotation roll unit is stationary, and the second rotation roll unit is provided to move left and right in a parallel direction thereof.   
     
     
         6 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 1 , characterized in that:
 the cutting unit includes a first cutting unit and a second cutting unit which are located at a left side and a right side of the rotation roll unit, respectively.   
     
     
         7 . The apparatus for producing a pitch-based chopped carbon fiber according to  claim 1 , characterized in that:
 the pitch-based chopped carbon fibers which are formed by being cut by the cutting unit are arranged in the same direction on the conveying unit.   
     
     
         8 . A method of producing a pitch-based chopped carbon fiber comprising:
 (a) injecting a molten pitch to a pitch fiber spinning unit;   (b) ejecting the molten pitch from the the pitch fiber spinning unit to spin a pitch fiber;   (c) winding the pitch fiber which is spun in step (b) on a rotation roll to draw the pitch fiber;   (d) cutting the pitch fiber which is wound on the rotation roll; and   (e) infusibilizing the cut pitch fiber.   
     
     
         9 . The method of producing a pitch-based chopped carbon fiber according to  claim 8 , characterized in that:
 the molten pitch is at least one selected from a petroleum-based pitch, coal-based pitch, and a chemical-based pitch.   
     
     
         10 . The method of producing a pitch-based chopped carbon fiber according to  claim 8 , characterized in that:
 a infusibilization temperature in step (e) is 150-400° C.   
     
     
         11 . The method of producing a pitch-based chopped carbon fiber according to  claim 8 , characterized further comprising:
 a step for infusibilizing the pitch fiber which is wound on the rotation roll before performing the cutting of step (d).   
     
     
         12 . The method of producing a pitch-based chopped carbon fiber according to  claim 11 , characterized in that:
 the infusibilization temperature is 150-280° C.   
     
     
         13 . The method of producing a pitch-based chopped carbon fiber according to  claim 8 , characterized in that:
 the infusibilization is performed in an atmosphere in which an oxidizing gas is mixed.   
     
     
         14 . The method of producing a pitch-based chopped carbon fiber according to  claim 8 , characterized in that:
 the pitch fibers which are cut in step (d) are arranged in the same direction.