| 摘要 |
PURPOSE:To obtain the titled plastic tube excellent in the roundness, by forming a reinforcing layer and a corrosion preventing layer on the outer circumference of a plastic tube with the inside of the plastic tube being pressurized. CONSTITUTION:Pressure is applied into the inside of the plastic tube 2 taken out from a plastic tube delivering apparatus 1 through said apparatus via an end member. In this state, it is fed to an armoring apparatus 3 where it is provided with the reinforcing layer (armor), then is covered with the corrosion preventing layer by a corrosion preventing layer extruder 4, and is taken up via a take-up side caterpillar 5 onto a take-up machine 6. One end of the plastic tube 2 is closed through a blank plug, and the other end is welded with an eye bolt end tube 7 of an end member 13, and is sealed by a lateral pressure No.5 valve 11 that is energized with an internal pressure from a pressurizing piping. |
