| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of a corrugate tube having excellent quality.SOLUTION: A production method of a corrugate tube 1 comprises: a step of manufacturing a cylindrical body 10 by extrusion processing; and a step of manufacturing the corrugate tube 1 by blow molding by compressing an inside of the cylindrical body 10, both steps are performed continuously. Since start of production until a time before the blow molding is started, a thickener is added to a resin composition B submitted for extrusion processing for increasing viscosity. After the inside of the cylindrical body is compressed and the blow molding is started, addition of the thickener is stopped.SELECTED DRAWING: Figure 1 |
