| 摘要 |
PURPOSE:To prevent flattening of a plastic pipe and to obtain a circular section by a method wherein the plastic pipe is drawn out of a first drum and wound round a second drum such that the surface of the pipe different from that having been circumscribed over the first drum by a given angle is circumscribed over the second drum. CONSTITUTION:A plastic pipe 2 wound round a first drum 1 is drawn out of the drum 1 and then wound round a second drum 3 such that the surface of the pipe different from that having been circumscribed over the first drum by 90 degrees is now circumscribed over the second drum. With this, the pipe 2 wound round the drum 1 in a sectional shape A is now wound round the drum 3 in a sectional shape B. Accordingly, the pipe 2 undergoes deformation at this time in the direction different from the previous one by 90 degrees to reform the flattening deformation occurred during winding round the drum 1, so that the pipe has a substantially circular section C when drawn out of the drum 3. In this way, it becomes possible to reform the flattening deformation occurred due to the drum 1 and obtain a substantially circular section when the pipe is drawn out of the drum 3. |
