A PROCEDURE AND A DEVICE FOR MANUFACTURING COMPOSITE TUBES WITH TUBULAR SLEEVE IN CONTINUOUS REGIME.

摘要

FOR THE CONTINUOUS MANUFACTURE OF A UNION TUBE, COMPOSED OF A SMOOTH INTERIOR TUBE (107) AND OF AN EXTERIOR TUBE (105), PROVIDED WITH TRANSVERSE SPLINES (24) WELDED TO THE SAME, WITH A TUBE SLEEVE, IT IS MOLDED BY EXTRUSION A EXTERIOR ELASTIC TUBE (104) AND INSIDE IT AN INTERIOR ELASTIC TUBE (106). DURING THE MANUFACTURE OF THE NORMAL JOINT PIPE, GAS IS BLOWED IN THE AREA, BETWEEN THE EXTERNAL ELASTIC TUBE (104) AND THE INTERIOR ELASTIC TUBE (106), UNDER A REDUCED OVERPRESSURE. DURING THE MANUFACTURE OF THE TUBE SLEEVE, THIS AREA IS PURGED IN ORDER TO ACHIEVE A SURFACE SUPPORT OF THE INTERIOR ELASTIC TUBE (106) WITH THE EXTERNAL ELASTIC TUBE (104), THEREFORE THE INTERIOR ELASTIC TUBE (106) IS SUBJECT TO GAS PRESSURE FROM THE INSIDE.