Abstract: An apparatus includes an elevated structure extending along and above a receptacle, a trolley for travel along the elevated structure, a trolley bucket supported by the trolley for receiving and discharging unconsolidated material, and a high-lift structure including a rotatable dumper lift for lifting unconsolidated material from a first elevation to a second elevation greater than the first elevation, and discharging unconsolidated material into the trolley bucket. The high-lift structure is operably coupled with the elevated structure. The rotatable dumper lift can receive a first volume of unconsolidated material at the first elevation, lift the first volume from the first elevation to the second elevation, and discharge the first volume into the trolley bucket. The trolley bucket can discharge the first volume of unconsolidated material into the receptacle while the rotatable dumper lift receives a second volume of unconsolidated material at the first elevation.

Abstract: A method of densifying polypropylene includes steps of reducing expanded polypropylene into relatively small particles and heating and compressing the particles to form densified polypropylene. The expanded polypropylene can be reduced to intermediate pieces prior to reduction to the small particles. The combination of the particle size, heat, and compression effects lasting densification of the polypropylene. An apparatus for densifying polypropylene includes a grinder to generate particles of expanded polypropylene and a densifier that heats and compresses the particles into densified polypropylene.