| 摘要 |
PROBLEM TO BE SOLVED: To provide a core having low frictional coefficient so that the sliding property in pulling out the core after a sheet material is taken up is improved and the sheet material is prevented from being scratched, and further having superior abrasion resistance, so that it can be continuously manufactured for a long time. SOLUTION: In this core for taking up the sheet material, the surface roughness (ten point average roughness) Rz of the core surface is 0.4-5μm, and a load length ratio tp in 40% cutting level is 20-95%. Preferably, the core surface is coated with ceramics. |
