| 摘要 |
PURPOSE:To obtain a package which has the improved filament releasing property because of possibility of neither shape deformation nor slip-off of single layer from a bobbin by winding-up a carbon filament in a specific apparent winding-up density onto a bobbin which has an outside diameter of a specific length or above and on which uneveness is formed. CONSTITUTION:The outside diameter of a bobbin 1 is set at 50mm. or more, so generation of fluff due to breakage of monofilament is prevented, obviating the bending in any severe curvature. Uneveness 2 for preventing slip-off of single layer by increasing the frictional force with carbon filament is formed on the surface of the bobbin 1. Onto the surface of said bobbin 1, a carbon filament 3 is wound-up in apparent winding-up density of 0.75-1.1g/cm<2>. Said apparent winding-up density means the value obtained by dividing the weight W(g) of the wound-up filament by the apparent volume of the filament. Therefore, the amount X of filament wound-up per surface area (cm<2>) of the bobbin 1 can be increased to about 3-8g., and a package which has an improved filament releasing property because of possibility of neither shape deformation nor slip-off of single layer from the bobbin 1 can be obtained. |
