| 摘要 |
<p>The invention relates to a method of extruding plastic materials in which the gap width in the shear section of the extruder between the extruder screw and the barrel surrounding the latter in the shear section is set by the conical surfaces on extruder screw and barrel defining the gap width being displaced in relation to one another. The method according to the invention provides for this in that, before conveying into the shear gap, the plastic material is preplasticised at a gap radius which corresponds to the entry radius into the shear gap. In the extruder for implementing the method, the radius of the extruder screw in this case corresponds to the respective larger or smaller connecting radius on the conically running shear section. Preferred applications are the processing of blended plastics and, in particular, recycling plastics. <IMAGE></p> |
