Fourth, the mixing effect in the cross section containing pin is continuously increased with time, but the mixing effect in the cross section without pin cant be increased with time when the mixing effect reaches a certain value.

• 有销钉结构随着挤出时间的增加,混合均化效果不断提高,无销钉结构随着挤出时间的增加,当混合均化效果达到一定值后则不再提高。