Efforts for in-material reutilization of elastomeric content of end-of-life tyres (ELTs) have a history of several decades but real breakthrough has not been achieved yet. The very reason is that recyclates made by conventional mechanical grinding have very limited direct re-vulcanization properties, which is particularly evident in case of even fine cryogenic rubber powder.
In the course of development of ultra-high pressure waterjet milling however we experienced that the rubber powder made by this process has an outstanding chemical bonding ability that support its advantageous compounding into different rubber and plastics matrices. Countless experiments for waterjet tyre milling have been performed all around the world, but due to various technical difficulties the implementation of complete processing technology was not successful until recently. The Hungarian HungaroJet Ltd. is the very first to realize a truck-tyre waterjet milling technology completely in its pilot plant that produces industrially applicable products. Products of the technology are fine rubber powder in the range of 50-500 microns and fine rubber crumb of 500-1500 microns.
Our innovative technology has also been acknowledged by the special prize of EEP Award. The EEP Award is organized by the European Environmental Press, the association of environmental magazines in Europe with support of the European Federation of Associations of Environmental Professionals (EFAEP) in collaboration with POLLUTEC, a world-wide leading annual environmental trade show.
The ultra-high pressure water jet milling technology can be considered as a new direction for fine milling of elastomers, such as rubber and similar elastic materials. Instead of conventional shredding and mechanical grinding of tyres, this technology applies only ultra-high pressure water jet for extraction and simultaneous milling of rubber (elastic) parts, leaving the reinforcing metal parts intact. The technology has been developed for milling of ELTs, but it can be adapted for milling of elastic polymers of different status and physical appearance (e.g. vulcanized factory rejects, conveyor belts etc.) ...
You can read the whole story in EU-Recycling, issue 04/2011, page 34-36.
Quelle: EU-Recycling / HungaroJet Ltd.