Tubes and pipes with moulded internal walls

摘要

The present invention relates to a tube, or a pipe, exhibiting, on its internal wall (2), fluting, mouldings (1), elongate elements with constant profile, hollow or projecting, square or round, straight or curved; often helical (Fig. 1). Amongst its advantages, the invention saves on the quantity of raw material whilst improving the strength of the walls, rigidifies the tube or promotes bending thereof, avoiding its bore (3) flattening, increases the contact surface between the internal wall and the fluid which runs through the pipe, thus promoting heat exchanges. This invention applies particularly to rigid or flexible extruded tubes and pipes; particularly to plumbing, sheaths and hoses.