| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for quantitatively evaluating the fibrillating state and the distribution state of fiber in a composite material to accurately determine the fibrillating state of fiber in the manufactured fiber-reinforcing composite material. SOLUTION: In a method for measuring the degree of fibrillating of a fiber in a fibrous material in powder, the section of the sample of a material where a fiber is mixed into powder is measured by a microscope, an average value Nf included in a measurement screen of 1 mm2 of the section and a sectional area of Af for one fiber are obtained in high magnification measurement, a fiber mass area AL being observed is obtained, an average value of NFU of the number of fibers at the fiber mass part included in a sample section of 1 mm2 is obtained by NFU=[AL.(1-ε)]/ATP.Af(ε: apparent void rate of fiber mass only, ATP: area of visual field of microscope,Af:average value of sectional area of one fiber), the number of fibrillated fibers Uf being exposed in a sample sectional area of 1 mm2 is obtained by Uf=Nf-NFU using the above expression, and a fiber-fibrillating rate RU is obtained from Uf by RU=Uf/Nf.
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