METHOD FOR MANUFACTURING CARBON FIBER NONWOVEN FABRIC AND NONWOVEN FABRIC

摘要

PROBLEM TO BE SOLVED: To provide a carbon fiber nonwoven fabric having a low basis weight in which an occurrence of wrinkles in carbonizing baking and a variation in the basis weight are suppressed.SOLUTION: The method for manufacturing a carbon fiber nonwoven fabric includes sequentially carrying out the respective processes, using a mixed raw cotton that contains 10-30 wt.% of carbon fiber precursor fibers having a mean fiber length of 30 mm to 100 mm and a carbonization rate of 40 wt.% or more and 70-90 wt.% of disappearing fibers (A) having a carbonization rate of 1.0% or less, in the following order. Process 1: a process for supplying the mixed raw cotton to a card to make a basis weight of a web spun from the card be 20.0 g/mor more. Process 2: a process for overlapping the webs obtained in the process 1 so as to form an 8 or more layer structure with a cross lapper. Process 3: a process for entangling the webs overlapped in the process 2 to form a nonwoven fabric. Process 4: a process for firing the nonwoven fabric obtained in the process 3 in an inert atmosphere to form a carbon fiber nonwoven fabric.