METHOD AND DEVICE FOR THE PRODUCTION OF A THERMOPLASTIC CORRUGATED PIPE WITH DOUBLE WALLS WITH A CONNECTING COUPLING

摘要

1. Method for the production of a continuous double-walled pipe, preferably made of thermoplastic material and having sections with a corrugated pipe and a section with a coupler, by extrusion of an external pipe (Sa) forming an external pipe in a double-walled pipe and an internal pipe (Si) forming an inner pipe in a double-walled pipe, in a molding passage (10) having at least one section with a corrugated molding surface, and at least one section with preferably smooth, cylindrical or several lko conical sleeve molding surface! wherein ! to form the corrugated portion, the outer tube (Sa) is extruded into the corrugated molding surface and brought into contact with the corrugated molding surface, while the inner tube (Si) is extruded into the outer tube (Sa) and brought into contact with the outer tube (Sa) located in contact with the corrugated molding surface in the region of the corrugation base of the outer pipe (Sa); ! to form the coupling section, the outer pipe (Sa) is extruded into the coupling molding surface and brought into contact with the coupling molding surface, while the inner pipe (Si) is extruded into the outer pipe (Sa), which is already in contact along the entire axial length with the coupling molding surface , and is brought into contact with the inner side of the outer pipe (Sa) already in contact with the clutch molding surface along the entire axial length of the clutch molding surface, during the process! different! the fact that the pressure (pa1) acting on the inner side of the outer pipe (Sa) is reduced (pa2) just before, or at the time when outside