| 摘要 |
In the present invention, there is disclosed a method for continuous manufacture of biaxially oriented tubing from thermoplastic material wherein the method comprises forcing a tube (1) over a mandrel (6) at an orientation temperature of the plastic material, which mandrel (6) comprises an expansion part (8) that produces expansion in the circumferential direction of the tube (1), and downstream of the mandrel the exertion of an axial pulling force on the tube (1), in the course of which the tube (1) encounters a resistance counteracting the movement of the tube (1) over the mandrel (6). The method also comprises the exertion of an influence sector-wise in an adjustable manner in the circumferential direction of the tube (1) on the resistance, which counteracts the movement of the tube (1) over the mandrel (6). |
