| 摘要 |
<p>The invention relates to an extrusion apparatus for preparing a cylindrical plastic product or for coating the product at least with one layer of plastic, the extrusion apparatus comprising at least one conical stator (3, 4, 5), at least one conical rotor (1, 2), and at least one conical supply opening (6, 7, 8, 9) between them for pressing the plastic material (M) to be extruded into an extrusion conduit (10). At the end of the rotor (1, 2) there are means (23; 12, 13; 24; 38, 39) for defibering and/or orienting the plastic material (M). The invention also relates to a method for defibering and/or orienting plastic material during the preparation or coating of a cylindrical plastic product.</p> |
