| 摘要 |
<p>The extruder comprises a mantle (1) surrounding a number of flights (8, 9) corresponding to the number of materials to be coextruded, and an extruder head (15), in which extruder the flights (8, 9) are coaxial and placed in extension of each other in the common transport direction of the materials. The front end of a flight which is behind (9) is connected to a duct (22) which within the flight/flights ahead (8) extends to the front end of the front flight (8). Several flights (8, 9) for different materials are provided in a single worm member (7) and within the mantle (1) at a flight (8, 9) an axially displaceable reversal member (17, 23) for controlled rerouting of extruded material is provided.</p> |
