| 摘要 |
PROBLEM TO BE SOLVED: To provide a seamless tube whose outside surface is smooth to such an extent that an image defect is extremely small or it is not caused as for an electrically conductive or an electrically semiconductive seamless belt used for an electrophotographic device and the like. SOLUTION: Almost concentrical ring-like branch paths 12a and 12b are formed at a two-layered die 12 and the die 12 is provided with a main ring-like flow passage 12c formed by joining the paths 12a and 12b on a downstream side and a ring-like slit 12d formed at the lower end as an exit. Then, only molten resin fed to the outermost-side ring-like branch path being the surface of a tube-like body is passed through a first filter device 16a having a comparatively micro filter member and the molten resin fed to the other branch path 12b is passed through a second filter device 16b having a comparatively coarse filter member. |
