Modern Experimental Solids Conveying Devices

Prior to these devices, Zhu and Chen [28] built a 45 mm diameter extruder with glass windows positioned In the barrel that allowed observation of the flows of a fully functioning machine. The extruder had a length-to-dlameter ratio of 25 and thus it allowed the observation of all sections of the process. In the solids conveying section, they observed that the pellets had relative movements between them and that the pellets did not behave as a ridged solid plug. This result is consistent with Moysey and Thompson [25-27]. 

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