| 摘要 |
It is disclosed a die (1) for the extrusion of tubular film, having a lip adjusting ring (3), having plurality of radial sectors (10), each one containing at least one heating element (7), wherein the radial sectors (10) are thermally insulated from each other by means of a plurality of holes (11a, 11b, 11c, 11d) substantially radially aligned and wherein the heating elements (7) are not exposed within the air of said plurality of holes (11a, 11b, 11c, 11d) defining said radial sectors (10). <IMAGE> |
