| 摘要 |
PURPOSE:To restrain the tendency of winding at the minimum by a method wherein a plastic pipe wound round a drum is rewound over another drum with a drum diameter smaller than or equal to the former drum such that the surface of the pipe opposite to that having been circumscribed round the drum is now circumscribing the drum in the reversed direction. CONSTITUTION:A plastic pipe 2 extruded out of an extruder 1 is wound round a drum 3 with a drum diameter of DA and left intact until the pipe has tendency to wind naturally. Next, the pipe 2 is rewound from the drum 3 to another drum 4 which has a drum diameter DB smaller than or equal to the drum diameter DA (DB<=DA). At this time, the pipe 2 is wound round the drum 4 such that the surface of the pipe opposite to that having been circumscribed round the drum 3 is now wound round the drum 4 in the reversed direction relative to the winding direction over the drum 3. By so doing, while the pipe 2 had tendency of winding as shown at 21, it now undergoes tendency of winding as shown at 22 to compensate the preveious tendency, so that the pipe has a substantially linear shape as shown at 23 when drawn out of the drum 4. The drum 3 may be formed to have a tapered cylinder 3A to make it possible that the pipe 2 is wound round the upper side of the cylinder 3A to be descended to the lower side by its own weight and then sent to the drum 4 from the lower side of the drum 3. |
