An apparatus 10 for forming a steady stream of plasticised solid feed material comprises: a piston-in-cylinder ram 11 to compact shredded solid feed material to form a solid billet 12 of plasticised solid feed material in the cylinder 13 which extrudes at least a portion of the solid billet from an exit end of the cylinder; a transfer path 14 in communication with the exit end of the cylinder 13; and a heater 15 associated with at least a portion of the transfer path 14 to plasticise the plasticised solid feed material and heat to temperature to form a plasticised solid feed material. The corresponding method is also disclosed.

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