RingExtruder Applications:
Plastics Recycling

Polymer degradation and decreased product properties are an issue when plastics are recycled using conventional extruders. To demonstrate reduced degradation within a RingExtruder, the effects of multiple passes through a 30 mm RingExtruder and a 58 mm diameter twin-screw extruder were compared. Although the RingExtruder had a greater volume per diameter length and is capable of greater throughputs, it was postulated that degradation within the RingExtruder would be less due to smaller channel sizes and material temperature increase.

A virgin polypropylene with a melt index of 12.8 was fed to both extruders, pelletized, and allowed to cool. Starting with cooled pellets in each case, this process was repeated 4 times with each extruder. The melt index after each pass through the RingExtruder and the twin screw extruder is plotted below. The final melt index of the material through the twin screw extruder is more than twice that of the material through the patented RingExtruder!

Partner with Century

Incorporating a RingExtruder into your operation can result in a quick return on your investment. Our research and engineering staff is ready to explore with you how your products and operations could benefit and to complete trials to quantify your benefits and savings. Contact us to schedule an engineering review of your requirements.