| 摘要 |
PURPOSE:To make extrusion molding of a pipe smoothly and continuously, by performing leading work in the vicinity of a taking-up device by arranging a lead pipe extending to the taking-up device from a space between an extruder and a sizing die, whose outer diameter is smaller than that of a nipple, prior to the leading work. CONSTITUTION:Prior to leading work, a lead pipe 11 whose outer diameter is smaller than that of a nipple 6 of an extruder 2 is arranged extending to a taking-up device 5 from a part between a sizing die 3 and the extruder, and a seal material 12 is arranged at a predetermined position in the vicinity of the taking- up device 5 in the lead pipe 11. After a pipe M has been extruded up to the rear end part 11a of the lead pipe 11, lead part M' is connected with the lead pipe 11 through coating by making pressure welding of the lead part M' to the external circumference of the lead pipe 11. The leading work is performed by making the taking-up device operate and taking-up the lead part M' along with the lead pipe 11 in front. As the seal material 12 is secured and expanded within the plastic pipe M, the inside of the plastic pipe M is sealed. |
