Patent ID: 7610743
Filing Date: 2009-11-03
Classification: D02G,D03D,D10B,Y10T

Abstract:
1. A carbon fiber spun yarn, which is a spun yarn of a carbon fiber that has an average (002)-interlayer spacing of 0.340-0.380 nm as measured by X-ray diffraction method, has a specific gravity of 1.55-1.80 as measured by a density gradient tube method, a hydrogen-to carbon atomic ratio (H/C) as measured by elementary analysis of at most 0.1 and contains 3-30 wt. % of carbon fiber having a fiber length of at least 150 mm, wherein the spun yarn has a weight per 1000 m (tex) of 30-150 g, a number of primary twist of 50-400 turns/m and a tensile strength of at least 0.15 N/tex and where the carbon fiber has an average diameter of 5-20 μm.