Reusing XLPE from Electrical Cable Waste: Cable Separation, Processing and Blend Properties

摘要

The recycling of power transmission cable was investigated by using different kinds of separation and reprocessing methods. The cross-linked polyethylene (XLPE) insulation of the cable, serving as a part of a broader study of the reprocessing of cross-linked thermoplastics, presented a specific challenge in separation. Separation of the XLPE from the other components of the cable was attempted by thermo-chemical, microwave and thermo-mechanical means. All three methods were able to separate the cable, and the relative advantages and disadvantages are discussed. Following separation, the following processing techniques were attempted: compression molding, extruding, and injection molding with and without preheating XLPE crumb. It was found that by preheating the XLPE and injection molding with high injection pressure, the neat XLPE could processed. Possible mechanisms for the flow and reconsolidation of XLPE crumb were hypothesized and investigated. Blends of XLPE crumb (0.3 to 3 mm particles) in either HDPE or LDPE were prepared and the tensile properties were evaluated.