An apparatus for forming a steady stream of plasticised solid feed material, the apparatus comprising a piston-in-cylinder ram to compact shredded, solid feed material to form a solid billet of plasticised solid feed material in the cylinder and to extrude at least a portion of the solid billet from an exit end of the cylinder, a transfer path in communication with the exit end of the cylinder, a heater associated with at least a portion of the transfer path to plasticise the plasticised solid feed material and heat to temperature to form a plasticised solid feed material.

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