Thermoplastic tube

A method for producing a socketed biaxially oriented thermoplastic tube starting from a prefabricated tube of biaxially oriented thermoplastic material having a tube body and an integral end part at least one end of said tube body, said end part having a greater wall thickness than the tube body, the axial stretching of the end part being at least equal to the axial stretching of the tube body, the method comprising the step of subject an end part of said prefabricated tube to a socket-forming operation.

A biaxially oriented thermoplastic tube, which tube has a tube body and, at one or both ends, an integrally formed socket, said tube having an axial stretching of the plastics material in the socket which is substantially equal to the axial stretching of the thermoplastic material in the tube body.

A biaxially oriented thermoplastic tube, which tube has a tube body and, at one or both ends thereof, an integrally formed socket, the socket having an outwardly bulging groove wall which delimits an internal groove in the tube for the accommodation of a sealing ring, wherein the groove wall has a wall thickness which is greater than or equal to adjacent parts of the socket which have a smaller diameter.

A biaxially oriented thermoplastic tube, which tube has a tube body and, at one end, an integrally formed socket and, at the other end, a spigot designed to fit into a socket of a similar tube, wherein the spigot has a greater wall thickness than the tube body.

22-29. (canceled)