MODIX – New way of homogenizing and compacting plastic waste feedstock

Author: Ugur Kaya, VTT

Conventional extrusion processes for bulky plastic waste require multiple steps before extrusion, such as shredding and pelletizing, due to the limitations of feeding large plastic parts directly into the feeding zone. MODIX, developed by VTT during the TREASoURcE project, is a novel extrusion process with a large feeding zone that allows the direct feeding of bulky materials without any pre-treatment.

What is MODIX?

In modular extruder MODIX, two cylinders are nested where the molten plastic passes through enabling a large contact area for accurate temperature control together with high shear. The product of MODIX processing is compacted homogenous material without any pre-treatment required for the input. The product can be used in pyrolysis treatment for instance thanks to its homogenization ability of the mixed plastic waste which include a variety of different polymer types and compacting them into smaller particles that can be directly fed into pyrolysis reactor.

One of the most important benefits of MODIX is possessing large feeding zone which allows feeding bulky material directly without any pre-treatment. MODIX treatment not only provides efficient mixing with short screw length, but also enables the possibility for long processing times with a compact system requiring minimal floor space. The investment costs of the MODIX extruder are lower due to simplified design and easy maintenance with decreased costs.