| 摘要 |
The invention concerns a method for manufacturing a flexible duct comprising, from inside outwards, a flexible metal tube with helical winding of coils (2), an internal sealing sheath (3) arranged around the said flexible metal tube, at least one armoured lap (5) wound around said internal sealing sheath and at least one external sealing sheath (7), the internal sealing sheath being extruded by extruding means on the flexible metal tube. It is characterised in that it consists further in heating said flexible metal tube (2) upstream of the extruding means at a temperature less than 100 DEG C. |
