| 摘要 |
An internal mandrel for cooling a tubular thin film is disclosed where an air layer is eliminated in the lower side cooler of the internal mandrel, so that the tubular thin film can be continuously and stably produced. In the internal mandrel for directly cooling the tubular thin film while using external circularly shaped cooling tank where the tubular thin film is downwardly extruded through a circular slit of the die, the internal mandrel is characterized in that coolant for cooling a lower most part of the internal mandrel is flown in the countercurrent direction in the internal mandrel to the tubular thin film.
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