MARIS has designed and patented a new two-step devulcanization process “EVOREC RUBBER PLUS” to produce devulcanized rubber with very high-quality standards.

By “devulcanization” we mean a process of selective breaking of the S-S and C-S bonds of the elastomer which causes only a limited degradation of the polymeric structure (C-C bond). The first stage involve devulcanization of the rubber by means of a corotating twin-screw extruder. The rubber thus devulcanized will go to feed, by direct connection, the second extruder.

The second stage, given by the combination of a single-screw extruder and a screen-changer, offers the possibility of achieving significant advantages:

  • Sudden cooling of the devulcanized rubber: this operation makes it possible to contain the temperature of the extruded strip while minimizing rubber degradation. The effects are observable both in terms of mechanical properties of the recycled material and in terms of reduced odor gas emissions;
  • Rubber filtration: this operation, made possible by the high thrust capacity of the single-screw extruder, allows the devulcanized rubber to be filtered before extrusion, again increasing the mechanical properties and, more generally, the qualities of the recycled material.

“EVOREC RUBBER PLUS”: a two-steps devulcanization process by Maris. | Photos by MARIS.

About MARIS

MARIS is a global manufacturer of complete extrusion lines, especially when it comes to co-rotating twin-screw extrusion lines, for the compounding and granulation of recyclable and non-recyclable materials.