METHOD OF PRODUCING A DOUBLE-WALL INSULATED PIPE, SUCH AS FOR A MOTOR VEHICLE EXHAUST LINE, AND PIPE THUS OBTAINED

摘要

The invention relates to a method of producing a double-wall insulated pipe (1) of the type that comprises an inner pipe (1) and an outer pipe (3) which define a space (4) that is filled with insulating material. According to the invention, prior to the filling of the space between the inner pipe and the outer pipe, one of the ends of said space (5) is blocked. Subsequently, the space is filled with an insulant comprising a microporous granular material and the second end (7) of the space is closed with a scarf joint (8) such that the end of the outer pipe (3) can move freely longitudinally in relation to the end of the inner pipe (2).