B - Operations – Transporting – 29 – B
Patent
B - Operations, Transporting
29
B
B29B 17/00 (2006.01) B29B 17/04 (2006.01) B29C 47/00 (2006.01) B29C 47/40 (2006.01) C08J 11/12 (2006.01)
Patent
CA 2242264
A process for dereticulating a cross-linked polymeric material, such as cross- linked polyethylene from scraps of electric cable coatings or from unused cable coatings through a mechanical mixing cycle, wherein the cross-linked material is subjected to a specific power per mass unit such as to induce shear stresses in the material itself and temperatures higher than pre-established minimum levels. At the end of this cycle the material goes back to a thermoplastic state that may be substantially regarded as thermoplastic; then, following granulation, cooling, drying and sacking, the material will be ready for re-use, either alone or mixed with virgin polymers, according to usual operating technologies for thermoplastic materials. Eventually, the mechanical mixing cycle may be preceeded by a preliminary crushing cycle of the cross-linked polymeric materials to be treated. Preferably, the mixing cycle is carried out in a twin-screw extruder with special screw and temperature profiles.
Ducatel Francoise
Prigent Madeleine
Triboulet Carlo
Alcatel Alsthom Compagnie Generale D'electricite
Nexans
Robic
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