HIGH-DENSITY NONWOVEN FABRIC OF FLAME-RESISTANT FIBER, NONWOVEN FABRIC OF CARBON FIBER, AND METHOD FOR PRODUCING THEM

摘要

PPROBLEM TO BE SOLVED: To provide a nonwoven fabric of a carbon fiber having excellent uniformity of a thickness and weight, proper rigidity and gas permeability; to provide a high-density nonwoven fabric of flame-resistant fiber of a precursor thereof; and to provide a method for producing them. PSOLUTION: The high-density nonwoven fabric of the flame-resistant fiber has 55-95 mass% content of the flame-resistant fiber, 5-45 mass% content of a thermoplastic synthetic fiber, 80-320 g/mSP2/SPweight and 3.0% coefficient of the variation of the weight, and also has 0.40-0.85 g/cmSP3/SPbulk density and 3.0% coefficient of the variation of the thickness when 61.9 kPa load is added thereto in the thickness direction. The nonwoven fabric of the carbon fiber has 30-100 g/mSP2/SPweight and 5.0% coefficient of the variation of the weight, and also has 0.20-0.50 g/cmSP3/SPbulk density and 5.0% coefficient of the variation of the thickness when 61.9 kPa load is added thereto in the thickness direction. The carbon fiber is obtained by treating the high-density nonwoven fabric of the flame-resistant fiber in an inert gas atmosphere at a temperature of 1,000-2,800C. PCOPYRIGHT: (C)2005,JPO&NCIPI