| 摘要 |
PURPOSE:To provide such a spinneret that the delivery face (and the inner surface of the polymer delivery hole) is coated with two or more layers of ceramic coating mutually differing in the materials to suppress polymer wetting on the delivery face leading to prevention of polymer spreading. CONSTITUTION:A ceramic coating 5 is applied, as the first layer, on the delivery face 4 of a spinneret followed by, on the first layer, application of another ceramic coating 6 as the second layer whose material differs from that of the coating 5. This multi-layered ceramic coating process will result in smoothness in the finished state of the spinneret, thus preventing polymer wetting, also enabling cleaning said face without injuring the delivery hole.
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