TUBULAR THERMOINSULATING DEVICE AND PROCESSES FOR THE MANUFACTURE THEREOF

摘要

The present invention relates to a tubular thermoinsulating device (10; 20; 30), comprising an evacuated envelope made of barrier sheets inside which an inorganic or polymeric, discontinuous or porous filling material (13; 23) is contained. Said envelope comprises an internal tubular element (11; 21; 31) and an external tubular element (12; 22; 32) of higher diameter, which are coaxially arranged one inside the other and are reciprocally sealed at their circular edges. The circular edges of said external tubular element (12; 22; 32) are adapted to the circular edges of said internal tubular element (11; 21; 31) by means of two plies (17, 17'; 25, 25'; 35, 35'). The present invention also relates to some processes for manufacturing said thermoinsulating device.