| 摘要 |
<p>The present invention relates to an improved process of purging an extrusion apparatus. The purging process is improved by adjusting the type of polymer material used to purge the extrusion apparatus and by adjusting the purging flow rate. The purging flow rate is lower than the extrusion flow rate, and the rotation speed of the screw (24) during purging is done by means of an auxilary motor (8).</p> |
