| 摘要 |
<p>Flexible hose (10) is made of successive independent layers including helical coils (1, 3, 4, 4b) of bands and/or various profiles and at least one sleeve (2, 5) of polymer material. At least one coil (11) is made of bands (12) of polytetrafluoroethylene (PTFE). The bands are made of PTFE modified with a perfluorinated comonomer, such as PPVE (n-perfluoropropylene-vinyl-ether). The hose comprises, from the inside to outside: an internal carcass (1) made of a coil of profiles in spirals stapled to one another; an internal sealing sleeve (2); an assembly of armor (3, 4a, 4b) made of coils of profiles and an external sealing sleeve (5). The PTFE coil is an intermediate layer between the carcass and the internal sealing sleeve or between two armor layers (4a, 4b). The PTFE layer is 0.5-5mm thick and the bands are very long made by welding together shorter bands.</p> |
