| 摘要 |
Process and device for producing large hollow bodies with multilayered plastic walls. In order to reduce the cost of the process and its control, and to obtain a uniform wall layer profile, several layers of material are brought together within an axially movable annular piston, forming a multilayered molten mass. The multilayered molton mass flows inside the annular piston, fanning out in the direction of an annular storage space. The annular piston is moved backwards by the molten mass and the latter is pressed out of an extrusion die as a multilayered extruded material by the forward movement of the annular piston. |
